/* roulang page: index */
/* ============================================
   1. Design Variables
============================================ */
:root {
  --primary: #00D4FF;
  --primary-dark: #0099CC;
  --primary-light: #66E6FF;
  --accent-green: #00FF88;
  --accent-amber: #FFB020;
  --bg-page: #0A0F1A;
  --bg-section: #101826;
  --bg-panel: rgba(18, 28, 44, 0.66);
  --bg-overlay: rgba(8, 12, 20, 0.85);
  --text-main: #EAF2F8;
  --text-sub: #A7B8C8;
  --text-weak: #6F8294;
  --text-invert: #0A0F1A;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(0, 212, 255, 0.35);
  --radius-card: 12px;
  --radius-sm: 6px;
  --radius-btn: 8px;
  --radius-pill: 32px;
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.28);
  --shadow-hover: 0 12px 36px rgba(0, 212, 255, 0.12);
  --shadow-glow: 0 0 22px rgba(0, 212, 255, 0.35);
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  --header-h: 64px;
}

/* ============================================
   2. Reset / Base
============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  font-size: 16px;
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-main);
  background: var(--bg-page);
  color: var(--text-main);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
  border-radius: 10px;
}
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
ul, ol {
  list-style: none;
}
button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}
input:focus, button:focus, a:focus {
  outline: 2px solid rgba(0, 212, 255, 0.4);
  outline-offset: 2px;
}
section {
  scroll-margin-top: 72px;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Section spacing */
.section {
  padding: 88px 0;
}
.section-alt {
  background: var(--bg-section);
}

/* ============================================
   3. Buttons
============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 28px;
  border-radius: var(--radius-btn);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.btn .btn-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}
.btn:hover .btn-icon {
  transform: translateX(2px);
}
.btn-primary {
  background: linear-gradient(135deg, #00D4FF, #0099CC);
  color: var(--text-invert);
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.30);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.55);
}
.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.20);
}
.btn-outline {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-main);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.15);
  transform: translateY(-2px);
}
.btn-outline:active {
  transform: translateY(1px);
}
.btn-lg {
  height: 54px;
  padding: 0 40px;
  font-size: 1rem;
}
.btn-sm {
  height: 36px;
  padding: 0 16px;
  font-size: 0.82rem;
}
.btn-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  filter: saturate(0.3);
}

/* ============================================
   4. Header / Nav
============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(10, 15, 26, 0.82);
  transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease, border-bottom 0.3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(10, 15, 26, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.7);
  position: relative;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 8px rgba(0, 212, 255, 0.5); }
  50% { box-shadow: 0 0 20px rgba(0, 212, 255, 0.9); }
}
.brand-text {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-main);
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
}
.nav-link {
  font-size: 0.82rem;
  color: var(--text-sub);
  padding: 6px 8px;
  border-radius: 4px;
  position: relative;
  white-space: nowrap;
  transition: color 0.25s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width 0.3s ease;
}
.nav-link:hover {
  color: var(--text-main);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 70%;
}
.nav-link.active {
  color: var(--primary-light);
}
.nav-link.cat-link {
  font-weight: 400;
  opacity: 0.85;
  font-size: 0.78rem;
}
.nav-link.cat-link:hover {
  opacity: 1;
  color: var(--primary-light);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.version-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-weak);
  border: 1px solid var(--border);
  padding: 4px 8px;
  border-radius: var(--radius-pill);
  background: rgba(16, 24, 38, 0.5);
  letter-spacing: 0.05em;
}
.btn-login {
  height: 40px;
  padding: 0 20px;
  font-size: 0.88rem;
}

/* ============================================
   5. Hero
============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--bg-page);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-1.webp');
  background-size: cover;
  background-position: center;
  opacity: 0.35;
  z-index: 0;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 15, 26, 0.92) 0%, rgba(0, 212, 255, 0.15) 50%, rgba(10, 15, 26, 0.95) 100%);
}
.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 880px;
  padding: 0 1.5rem;
  margin-top: -40px;
}
.hero h1 {
  font-size: 2.9rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--text-main);
}
.hero-grad {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-sub);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.65;
}
.hero-cta {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 24px 16px;
}
.stat-item {
  text-align: center;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0 4px;
}
.stat-item:last-child {
  border-right: none;
}
.stat-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary-light);
  display: block;
  margin-bottom: 4px;
}
.stat-label {
  font-size: 0.78rem;
  color: var(--text-sub);
}
.scroll-down {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-size: 1rem;
  animation: float-down 2s ease-in-out infinite;
  transition: color 0.3s ease, border-color 0.3s ease;
}
.scroll-down:hover {
  color: var(--primary);
  border-color: var(--primary);
  animation-play-state: paused;
}
@keyframes float-down {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 6px); }
}

/* ============================================
   6. Section Heading
============================================ */
.section-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
}
.section-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--primary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.section-head h2 {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.01em;
}
.section-line {
  flex: 0 0 64px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), transparent);
  border-radius: 2px;
  margin-left: 8px;
}
.section-sub {
  font-size: 0.92rem;
  color: var(--text-sub);
  max-width: 600px;
  margin-bottom: 36px;
  line-height: 1.7;
}

/* ============================================
   7. Features Section (S1)
============================================ */
.features-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: stretch;
}
.features-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.feature-item {
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: transform 0.3s ease;
}
.feature-item:hover {
  transform: translateX(4px);
}
.feature-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 600;
  display: inline-block;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--primary);
  margin-bottom: 10px;
}
.feature-item h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}
.feature-item p {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.7;
}
.features-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 420px;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
}
.features-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.65;
}
.login-demo {
  position: absolute;
  right: 24px;
  bottom: 24px;
  width: 260px;
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.92), rgba(10, 20, 32, 0.75));
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 20px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
}
.login-demo-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.login-demo-title {
  font-size: 0.78rem;
  color: var(--text-sub);
  font-weight: 600;
}
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 10px rgba(0, 255, 136, 0.7);
}
.login-demo-field {
  height: 38px;
  background: rgba(8, 12, 20, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 6px;
  margin-bottom: 10px;
  padding: 0 12px;
  font-size: 0.78rem;
  color: var(--text-weak);
  display: flex;
  align-items: center;
}
.login-demo-field:last-of-type {
  margin-bottom: 14px;
}
.login-demo-btn {
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--text-invert);
  border-radius: var(--radius-btn);
  font-size: 0.82rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* ============================================
   8. Demo Section (S2)
============================================ */
.demo-section {
  background: #0D1420;
  position: relative;
}
.demo-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.demo-inner {
  position: relative;
  z-index: 1;
}
.steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.step-item {
  display: flex;
  align-items: center;
  gap: 14px;
}
.step-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(0, 153, 204, 0.1));
  border: 1px solid rgba(0, 212, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.2rem;
  flex-shrink: 0;
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.15);
}
.step-text h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 2px;
}
.step-text p {
  font-size: 0.8rem;
  color: var(--text-sub);
}
.step-line {
  width: 60px;
  height: 0;
  border-top: 2px dashed rgba(0, 212, 255, 0.4);
  position: relative;
}
.step-line::after {
  content: '';
  position: absolute;
  right: -4px;
  top: -5px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}
.demo-panel {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.85), rgba(10, 20, 32, 0.7));
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
}
.demo-panel-head {
  background: rgba(8, 12, 20, 0.5);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}
.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.window-dot.red {
  background: #FF5F57;
}
.window-dot.yellow {
  background: #FFBD2E;
}
.window-dot.green {
  background: #28C840;
}
.demo-panel-title {
  margin-left: 8px;
  font-size: 0.78rem;
  color: var(--text-weak);
  font-family: var(--font-mono);
}
.demo-panel-body {
  padding: 24px;
  overflow-x: auto;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.data-table th {
  text-align: left;
  padding: 12px 14px;
  color: var(--text-weak);
  font-weight: 500;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  white-space: nowrap;
}
.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-sub);
  white-space: nowrap;
}
.data-table tr:hover td {
  background: rgba(0, 212, 255, 0.06);
  color: var(--text-main);
}
.data-table .status-success {
  color: var(--accent-green);
}
.data-table .status-warning {
  color: var(--accent-amber);
}

/* ============================================
   9. Proof Section (S3)
============================================ */
.proof-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 56px;
}
.metric-card {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  position: relative;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  box-shadow: var(--shadow-card);
}
.metric-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}
.metric-card::after {
  content: '';
  position: absolute;
  right: 16px;
  bottom: 16px;
  width: 32px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary) 0%, transparent 70%);
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  opacity: 0.25;
}
.metric-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-light);
  display: block;
  margin-bottom: 6px;
}
.metric-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
}
.timeline-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--primary), rgba(0, 212, 255, 0.1));
}
.timeline-item {
  position: relative;
  margin-bottom: 32px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -26px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.6);
}
.timeline-year {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 4px;
}
.timeline-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 4px;
}
.timeline-desc {
  font-size: 0.82rem;
  color: var(--text-sub);
  line-height: 1.6;
}
.proof-img-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.proof-img-grid img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-card);
  border: 1px solid var(--border);
}

/* ============================================
   10. Pricing Section (S4)
============================================ */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}
.plan-card {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-card);
}
.plan-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}
.plan-card.featured {
  border-color: rgba(0, 212, 255, 0.5);
  box-shadow: 0 0 32px rgba(0, 212, 255, 0.18), var(--shadow-card);
  transform: scale(1.02);
  min-height: 100%;
  padding-top: 44px;
  margin-top: -20px;
}
.plan-card.featured:hover {
  transform: scale(1.04) translateY(-4px);
  box-shadow: 0 0 44px rgba(0, 212, 255, 0.28), var(--shadow-hover);
}
.plan-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--text-invert);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.4);
  letter-spacing: 0.03em;
}
.plan-name {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.plan-price {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-light);
  margin-bottom: 4px;
}
.plan-price-period {
  font-size: 0.8rem;
  color: var(--text-weak);
  font-family: var(--font-main);
  font-weight: 400;
}
.plan-desc {
  font-size: 0.82rem;
  color: var(--text-sub);
  margin-bottom: 20px;
}
.plan-list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  columns: 2;
  column-gap: 16px;
}
.plan-list li {
  font-size: 0.82rem;
  color: var(--text-sub);
  padding: 5px 0;
  display: flex;
  align-items: center;
  gap: 6px;
  break-inside: avoid;
}
.plan-list li::before {
  content: '';
  width: 14px;
  height: 14px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%2300D4FF' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='3 8 6.5 11.5 13 5'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  flex-shrink: 0;
}
.plan-card .btn {
  margin-top: auto;
  width: 100%;
}

/* ============================================
   11. FAQ Section (S5)
============================================ */
.faq-section {
  background: var(--bg-page);
}
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 24px;
}
.faq-item {
  background: rgba(16, 24, 38, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-card);
  overflow: hidden;
  margin-bottom: 0 !important;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.faq-item:hover {
  border-color: rgba(0, 212, 255, 0.15);
}
.faq-question {
  min-height: 54px;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-main);
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  transition: background 0.25s ease;
}
.faq-question:hover {
  background: rgba(0, 212, 255, 0.04);
}
.faq-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 600;
  flex-shrink: 0;
}
.faq-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-left: auto;
  position: relative;
  transition: transform 0.3s ease;
}
.faq-icon::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 12px;
  height: 2px;
  background: var(--text-weak);
  border-radius: 2px;
}
.faq-icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 2px;
  height: 12px;
  background: var(--text-weak);
  border-radius: 2px;
  transition: transform 0.3s ease;
}
.faq-item.is-active .faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}
.faq-item.is-active .faq-icon::before {
  background: var(--primary);
}
.faq-answer {
  padding: 0 20px 16px;
  border-left: 2px solid var(--primary);
  margin-left: 34px;
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.75;
  display: none;
}
.faq-item.is-active .faq-answer {
  display: block;
  animation: fadeInUp 0.25s ease;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   12. News List
============================================ */
.news-section {
  background: var(--bg-section);
}
.news-list {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
}
.news-row {
  display: grid;
  grid-template-columns: 100px 1fr 180px;
  gap: 20px;
  align-items: center;
  padding: 20px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  transition: background 0.3s ease;
}
.news-row:hover {
  background: rgba(0, 212, 255, 0.04);
}
.news-date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-weak);
  white-space: nowrap;
}
.news-body {
  min-width: 0;
}
.news-title {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-main);
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: 4px;
  transition: color 0.25s ease;
}
.news-title:hover {
  color: var(--primary-light);
}
.news-excerpt {
  font-size: 0.84rem;
  color: var(--text-sub);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0;
}
.news-right {
  display: flex;
  align-items: center;
  gap: 14px;
  justify-content: flex-end;
}
.news-cat {
  font-size: 0.72rem;
  color: var(--primary-light);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.2);
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}
.news-link {
  font-size: 0.82rem;
  color: var(--text-sub);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.25s ease;
}
.news-link:hover {
  color: var(--primary);
}
.news-link svg {
  width: 14px;
  height: 14px;
  transition: transform 0.3s ease;
}
.news-link:hover svg {
  transform: translateX(3px);
}
.news-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 56px 24px;
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  width: 66.67%;
  margin: 0 auto;
  text-align: center;
}
.news-empty svg {
  width: 40px;
  height: 40px;
  color: var(--text-weak);
  margin-bottom: 12px;
}
.news-empty p {
  color: var(--text-sub);
  font-size: 0.9rem;
}
.news-more {
  text-align: right;
  margin-top: 16px;
}
.text-link {
  font-size: 0.85rem;
  color: var(--text-sub);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.25s ease;
}
.text-link:hover {
  color: var(--primary);
}
.text-link svg {
  width: 14px;
  height: 14px;
  transition: transform 0.3s ease;
}
.text-link:hover svg {
  transform: translateX(3px);
}

/* ============================================
   13. Final CTA
============================================ */
.final-cta {
  position: relative;
  padding: 88px 0;
  background: var(--bg-page);
}
.final-cta-inner {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.85), rgba(10, 20, 32, 0.7));
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 64px 32px;
  text-align: center;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
}
.final-cta-inner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.6);
}
.cta-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.cta-sub {
  font-size: 0.92rem;
  color: var(--text-sub);
  max-width: 480px;
  margin: 0 auto 32px;
}

/* ============================================
   14. Footer
============================================ */
.site-footer {
  background: #070B12;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 56px 0 0;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.footer-brand .brand-dot {
  width: 8px;
  height: 8px;
}
.footer-brand .brand-text {
  font-size: 0.95rem;
}
.footer-desc {
  font-size: 0.82rem;
  color: var(--text-sub);
  line-height: 1.7;
  max-width: 320px;
}
.footer-col-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-links a {
  font-size: 0.82rem;
  color: var(--text-sub);
  transition: color 0.3s ease, transform 0.3s ease;
  display: inline-block;
}
.footer-links a:hover {
  color: var(--primary);
  transform: translateX(2px);
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 20px 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-copyright {
  font-size: 0.75rem;
  color: var(--text-weak);
}
.footer-icp {
  font-size: 0.75rem;
  color: var(--text-weak);
  font-family: var(--font-mono);
}

/* ============================================
   15. Float CTA
============================================ */
.float-cta {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.float-cta.visible {
  opacity: 0.92;
  visibility: visible;
  transform: translateY(0);
}
.float-cta:hover {
  opacity: 1;
}

/* ============================================
   16. Mobile Bottom Nav
============================================ */
.mobile-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: rgba(10, 15, 26, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  display: none;
  z-index: 1000;
  padding: 0 16px;
}
.mobile-bottom-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100%;
}
.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-size: 0.72rem;
  color: var(--text-sub);
  transition: color 0.25s ease;
  flex: 1;
}
.mobile-nav-item.active {
  color: var(--primary);
}
.mobile-nav-item svg {
  width: 20px;
  height: 20px;
}
.mobile-nav-center {
  flex: 0 0 60px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.mobile-login-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.45);
  color: var(--text-invert);
  margin-top: -20px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.mobile-login-btn:hover {
  transform: scale(1.06);
  box-shadow: 0 0 28px rgba(0, 212, 255, 0.6);
}
.mobile-login-btn svg {
  width: 18px;
  height: 18px;
}

/* ============================================
   17. Responsive Breakpoints
============================================ */
@media (max-width: 1024px) {
  .main-nav {
    display: none;
  }
  .header-actions .version-badge {
    display: none;
  }
  .features-layout {
    grid-template-columns: 1fr;
  }
  .proof-img-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }
  .hero {
    min-height: 86vh;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 8px;
  }
  .stat-item {
    border-right: none;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .plan-card.featured {
    margin-top: 0;
    transform: none;
    min-height: auto;
  }
  .faq-grid {
    grid-template-columns: 1fr;
  }
  .news-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 18px 12px;
  }
  .news-date {
    font-size: 0.72rem;
  }
  .news-right {
    justify-content: flex-start;
  }
  .news-excerpt {
    -webkit-line-clamp: 2;
  }
  .timeline-wrap {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .proof-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .mobile-bottom-nav {
    display: block;
  }
  .float-cta {
    bottom: 76px;
    right: 16px;
  }
  .float-cta .btn {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 50%;
    justify-content: center;
  }
  .float-cta .btn .btn-text {
    display: none;
  }
  .float-cta .btn .btn-icon {
    width: 20px;
    height: 20px;
    margin: 0;
  }
  body {
    padding-bottom: 76px;
  }
  .final-cta-inner {
    padding: 48px 24px;
  }
  .cta-title {
    font-size: 1.3rem;
  }
  .demo-panel-body {
    padding: 16px;
  }
  .news-empty {
    width: 100%;
  }
}

@media (max-width: 375px) {
  .hero h1 {
    font-size: 1.7rem;
  }
  .hero-sub {
    font-size: 0.9rem;
  }
  .hero-cta {
    flex-direction: column;
  }
  .hero-cta .btn {
    width: 100%;
  }
  .section-head h2 {
    font-size: 1.4rem;
  }
  .section-head {
    flex-wrap: wrap;
    gap: 8px;
  }
  .step-line {
    width: 24px;
  }
  .brand-text {
    font-size: 0.92rem;
  }
}

/* roulang page: category1 */
:root {
  --primary: #00D4FF;
  --primary-dark: #0099CC;
  --primary-light: #66E6FF;
  --success: #00FF88;
  --warning: #FFB020;
  --bg-page: #0A0F1A;
  --bg-section: #101826;
  --panel-bg: rgba(18, 28, 44, 0.66);
  --overlay-bg: rgba(8, 12, 20, 0.85);
  --text-main: #EAF2F8;
  --text-sub: #A7B8C8;
  --text-weak: #6F8294;
  --text-invert: #0A0F1A;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(0, 212, 255, 0.35);
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-small: 6px;
  --radius-pill: 32px;
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.28);
  --shadow-hover: 0 12px 36px rgba(0, 212, 255, 0.12);
  --shadow-glow: 0 0 22px rgba(0, 212, 255, 0.35);
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-main);
  background: var(--bg-page);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-align: left;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='320' height='160' viewBox='0 0 320 160'%3E%3Cpath d='M0 160V80h30v20h20V60h20v20h20V20h20v60h20V40h20v20h20V60h20v100z' fill='none' stroke='%2300D4FF' stroke-width='2' opacity='0.05'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 320px 160px;
}
a { color: var(--primary); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--primary-light); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding-left: 1.5rem; padding-right: 1.5rem; position: relative; z-index: 1; }
section { position: relative; z-index: 1; }

/* ===== Header / Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  z-index: 100;
  background: rgba(10, 15, 26, 0.82);
  transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(10, 15, 26, 0.94);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}
.header-inner {
  max-width: 1280px;
  height: 64px;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-shrink: 0;
}
.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.7);
  flex-shrink: 0;
}
.brand-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 0.28rem;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}
.main-nav::-webkit-scrollbar { display: none; }
.main-nav .nav-link {
  font-size: 0.85rem;
  color: var(--text-sub);
  padding: 0.55rem 0.7rem;
  border-radius: var(--radius-small);
  white-space: nowrap;
  position: relative;
  transition: color 0.2s ease;
}
.main-nav .nav-link:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
}
.main-nav .nav-link.active {
  color: var(--primary);
  font-weight: 600;
}
.main-nav .nav-link.cat-link {
  font-weight: 400;
  font-size: 0.82rem;
  opacity: 0.75;
}
.main-nav .nav-link.cat-link:hover,
.main-nav .nav-link.cat-link.active {
  opacity: 1;
  color: var(--primary);
}
.main-nav .nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transform: translateX(-50%);
  transition: width 0.25s ease;
}
.main-nav .nav-link:hover::after,
.main-nav .nav-link.active::after {
  width: 60%;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-shrink: 0;
}
.version-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-weak);
  border: 1px solid var(--border);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.02);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 46px;
  padding: 0 28px;
  border-radius: var(--radius-btn);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all 0.25s ease;
  border: none;
  outline: none;
  text-decoration: none;
  line-height: 1;
}
.btn svg { transition: transform 0.25s ease; }
.btn:hover svg { transform: translateX(2px); }
.btn:active svg { transform: translateX(0); }
.btn:focus-visible { outline: 3px solid rgba(0, 212, 255, 0.35); outline-offset: 2px; }
.btn-primary {
  background: linear-gradient(135deg, #00D4FF, #0099CC);
  color: var(--text-invert);
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.3);
}
.btn-primary:hover {
  color: var(--text-invert);
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.55);
}
.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.2);
}
.btn-outline {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-main);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.15);
  transform: translateY(-2px);
}
.btn-outline:active {
  transform: translateY(1px);
}
.btn-lg { height: 52px; padding: 0 36px; font-size: 1rem; }
.btn-sm { height: 38px; padding: 0 18px; font-size: 0.82rem; }
.btn-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}
.btn-login { height: 40px; padding: 0 22px; font-size: 0.85rem; }

/* ===== Breadcrumb ===== */
.breadcrumb-wrap {
  background: rgba(10, 15, 26, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  padding: 0;
  margin-top: 64px;
}
.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  font-size: 0.82rem;
  color: var(--text-weak);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.breadcrumb a { color: var(--text-weak); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .current { color: var(--primary); }
.breadcrumb .sep { color: var(--text-weak); }

/* ===== Page Hero ===== */
.page-hero {
  position: relative;
  padding: 88px 0 64px;
  background-size: cover;
  background-position: center;
  background-color: var(--bg-page);
}
.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 15, 26, 0.55) 0%, rgba(10, 15, 26, 0.72) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}
.hero-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--primary);
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
}
.hero-label::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--primary);
  display: inline-block;
}
.page-hero h1 {
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.02em;
  color: var(--text-main);
  margin-bottom: 1.2rem;
}
.page-hero .hero-sub {
  font-size: 1.05rem;
  color: var(--text-sub);
  line-height: 1.7;
  max-width: 620px;
}

/* ===== Section Head ===== */
.section-head {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}
.sec-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--primary);
  text-transform: uppercase;
  white-space: nowrap;
  padding: 0.25rem 0.8rem;
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: var(--radius-pill);
  background: rgba(0, 212, 255, 0.06);
}
.section-head h2 {
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 0;
  line-height: 1.4;
  white-space: nowrap;
}
.sec-line {
  flex: 1;
  height: 2px;
  max-width: 80px;
  background: linear-gradient(90deg, var(--primary), transparent);
  border-radius: 2px;
}

/* ===== Page Sections ===== */
.page-section { padding: 88px 0; }
.section-alt {
  background: var(--bg-section);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.section-tinted {
  background: linear-gradient(180deg, var(--bg-page) 0%, #0D1420 50%, var(--bg-page) 100%);
}
.section-grid-bg {
  background-image: linear-gradient(rgba(0, 212, 255, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 212, 255, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* ===== Two Column Content ===== */
.two-col-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.8rem;
  text-align: justify;
}
.two-col-grid p {
  color: var(--text-sub);
  line-height: 1.85;
}
.content-panel {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-card);
  padding: 2rem;
  position: relative;
  margin-bottom: 2rem;
}
.content-panel::before {
  content: "";
  position: absolute;
  top: 18px;
  left: 18px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}
.content-figure {
  margin: 2rem 0;
}
.content-figure img {
  border-radius: var(--radius-card);
  width: 100%;
  object-fit: cover;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
}
.content-figure figcaption {
  font-size: 0.8rem;
  color: var(--text-weak);
  margin-top: 0.5rem;
  padding-left: 0.3rem;
}

/* ===== Side Card ===== */
.side-sticky {
  position: sticky;
  top: 96px;
}
.glass-card {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-card);
  padding: 1.8rem;
  position: relative;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.glass-card::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 14px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}
.side-title {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 1.2rem;
  padding-left: 0.4rem;
}
.side-list { list-style: none; }
.side-list li {
  display: flex;
  gap: 0.6rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.85rem;
  color: var(--text-sub);
}
.side-list li:last-child { border-bottom: none; }
.side-list .label {
  color: var(--text-weak);
  flex-shrink: 0;
  min-width: 74px;
  font-size: 0.8rem;
}
.side-list .value {
  color: var(--text-main);
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.side-note {
  margin-top: 1.2rem;
  padding: 0.9rem 1rem;
  background: rgba(0, 212, 255, 0.08);
  border-left: 2px solid var(--primary);
  border-radius: var(--radius-small);
  font-size: 0.82rem;
  color: var(--text-sub);
  line-height: 1.6;
}
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px rgba(0, 255, 136, 0.6);
  margin-right: 0.4rem;
  vertical-align: 1px;
}

/* ===== Feature Grid ===== */
.feature-grid .cell { margin-bottom: 1.8rem; }
.feature-card {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-card);
  padding: 1.6rem;
  height: 100%;
  position: relative;
  transition: all 0.3s ease;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 14px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.feature-card:hover::before {
  background: var(--success);
  box-shadow: 0 0 10px rgba(0, 255, 136, 0.7);
}
.feature-card .feat-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(0, 212, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  border: 1px solid rgba(0, 212, 255, 0.2);
}
.feature-card .feat-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--primary);
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.6rem;
}
.feature-card p {
  font-size: 0.85rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 0;
}
.feature-card .feat-tag {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--primary);
  background: rgba(0, 212, 255, 0.08);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.7rem;
  margin-top: 0.9rem;
}

/* ===== Gallery ===== */
.gallery-grid .cell { margin-bottom: 2rem; }
.gallery-item {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}
.gallery-item:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}
.gallery-item img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.gallery-item:hover img { transform: scale(1.04); }
.gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.2rem;
  background: linear-gradient(180deg, transparent, rgba(10, 15, 26, 0.85));
  color: var(--text-main);
  font-size: 0.9rem;
  font-weight: 500;
}

/* ===== Entry Cards ===== */
.entry-card {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-card);
  padding: 1.8rem;
  height: 100%;
  position: relative;
  transition: all 0.3s ease;
}
.entry-card::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 14px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}
.entry-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}
.entry-card .entry-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--primary);
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
}
.entry-card h3 {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.55rem;
}
.entry-card p {
  font-size: 0.84rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 1rem;
}
.entry-card .entry-link {
  font-size: 0.82rem;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap 0.25s ease;
}
.entry-card .entry-link:hover { gap: 0.5rem; }

/* ===== Notice ===== */
.notice-panel {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: rgba(255, 176, 32, 0.08);
  border: 1px solid rgba(255, 176, 32, 0.18);
  border-radius: var(--radius-card);
  padding: 1.4rem 1.6rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}
.notice-badge {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  background: rgba(255, 176, 32, 0.15);
  border: 1px solid rgba(255, 176, 32, 0.3);
  color: var(--warning);
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.9rem;
}
.notice-panel p {
  font-size: 0.86rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ===== FAQ ===== */
.faq-wrap .accordion {
  margin-bottom: 1.5rem;
  background: transparent;
}
.faq-wrap .accordion-item {
  background: rgba(16, 24, 38, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-card) !important;
  margin-bottom: 0.9rem;
  overflow: hidden;
  transition: border-color 0.25s ease;
}
.faq-wrap .accordion-item:hover {
  border-color: rgba(0, 212, 255, 0.25);
}
.faq-wrap .accordion-title {
  font-size: 0.9rem;
  color: var(--text-main);
  padding: 0.9rem 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  background: transparent;
  border: none;
  min-height: 54px;
  line-height: 1.4;
}
.faq-wrap .accordion-title::before {
  content: attr(data-num);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--primary);
  flex-shrink: 0;
}
.faq-wrap .accordion-title::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--text-weak);
  margin-left: auto;
  transition: transform 0.25s ease, color 0.25s ease;
}
.faq-wrap .accordion-item.is-active .accordion-title::after {
  transform: rotate(45deg);
  color: var(--primary);
}
.faq-wrap .accordion-content {
  background: transparent;
  border: none;
  padding: 0 1.2rem 1.1rem;
  color: var(--text-sub);
  font-size: 0.85rem;
  line-height: 1.75;
  border-left: 2px solid var(--primary);
  margin-left: 1.35rem;
}
.faq-wrap .accordion-content p { margin-bottom: 0.6rem; }
.faq-wrap .accordion-content p:last-child { margin-bottom: 0; }

/* ===== CTA ===== */
.cta-panel {
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(0, 153, 204, 0.05)), rgba(16, 24, 38, 0.7);
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: 16px;
  padding: 3.2rem 2.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 40px rgba(0, 212, 255, 0.12);
}
.cta-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.6), transparent);
}
.cta-panel h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.8rem;
}
.cta-panel p {
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-bottom: 1.8rem;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}
.cta-panel .btn { margin: 0 0.4rem; }
.cta-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(0, 255, 136, 0.1);
  border: 1px solid rgba(0, 255, 136, 0.25);
  color: var(--success);
  font-size: 0.78rem;
  border-radius: var(--radius-pill);
  padding: 0.3rem 1rem;
  margin-bottom: 1.2rem;
}
.cta-badge .status-dot { margin-right: 0.3rem; }

/* ===== Footer ===== */
.site-footer {
  background: #070B12;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 3rem 0 1.5rem;
  margin-top: 0;
  position: relative;
  z-index: 1;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.2rem;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.9rem;
}
.footer-brand .brand-text {
  font-size: 1.05rem;
  color: var(--text-main);
}
.footer-desc {
  font-size: 0.84rem;
  color: var(--text-weak);
  line-height: 1.7;
  max-width: 380px;
}
.footer-col-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 1rem;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.footer-links a {
  font-size: 0.84rem;
  color: var(--text-sub);
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-links a:hover {
  color: var(--primary);
  padding-left: 2px;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.78rem;
  color: var(--text-weak);
}
.footer-copyright { font-size: 0.78rem; }
.footer-icp { font-family: var(--font-mono); font-size: 0.75rem; }

/* ===== Float CTA ===== */
.float-cta {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
}
.float-cta.show {
  opacity: 0.92;
  visibility: visible;
  transform: translateY(0);
}
.float-cta .btn { box-shadow: 0 0 22px rgba(0, 212, 255, 0.35); }

/* ===== Mobile Bottom Nav ===== */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: rgba(10, 15, 26, 0.96);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  z-index: 95;
  justify-content: space-around;
  align-items: center;
}
.mobile-bottom-nav .mnav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 0.7rem;
  color: var(--text-sub);
  transition: color 0.2s ease;
}
.mobile-bottom-nav .mnav-item:hover { color: var(--primary); }
.mobile-bottom-nav .mnav-item.active { color: var(--primary); }
.mobile-bottom-nav .mnav-item svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.mobile-bottom-nav .mnav-login {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00D4FF, #0099CC);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.4);
  margin-top: -20px;
  border: 3px solid var(--bg-page);
  transition: box-shadow 0.3s ease, transform 0.2s ease;
}
.mobile-bottom-nav .mnav-login:hover {
  box-shadow: 0 0 28px rgba(0, 212, 255, 0.6);
  transform: scale(1.03);
}
.mobile-bottom-nav .mnav-login svg {
  width: 20px;
  height: 20px;
  stroke: var(--text-invert);
  fill: none;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ===== Scroll margin ===== */
section[id] { scroll-margin-top: 72px; }

/* ===== Responsive ===== */
@media (min-width: 1025px) {
  .mobile-bottom-nav { display: none !important; }
}
@media (max-width: 1024px) {
  .main-nav { gap: 0.15rem; }
  .main-nav .nav-link { padding: 0.5rem 0.5rem; font-size: 0.82rem; }
  .brand-text { font-size: 1rem; }
  .header-inner { gap: 1rem; }
  .page-section { padding: 64px 0; }
  .cta-panel { padding: 2.4rem 1.8rem; }
}
@media (max-width: 768px) {
  .header-inner { padding: 0 1rem; }
  .main-nav { display: none; }
  .header-actions .version-badge { display: none; }
  .header-actions .btn-login { padding: 0 16px; font-size: 0.82rem; }
  .page-hero { padding: 64px 0 48px; }
  .page-hero h1 { font-size: 2rem; }
  .page-hero .hero-sub { font-size: 0.92rem; }
  .two-col-grid { grid-template-columns: 1fr; gap: 1.2rem; }
  .content-panel { padding: 1.5rem; }
  .side-sticky { position: static; margin-top: 2rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.8rem; }
  .footer-bottom { flex-direction: column; gap: 0.6rem; }
  .cta-panel h2 { font-size: 1.3rem; }
  .gallery-item img { height: 200px; }
  .float-cta { bottom: 70px; right: 16px; }
  .mobile-bottom-nav { display: flex; }
  .site-footer { padding-bottom: 3.4rem; }
}
@media (max-width: 520px) {
  .hero-label { font-size: 0.72rem; }
  .page-hero h1 { font-size: 1.7rem; }
  .sec-label { font-size: 0.7rem; padding: 0.2rem 0.6rem; }
  .section-head h2 { font-size: 1.2rem; }
  .section-head { flex-wrap: wrap; gap: 0.6rem; }
  .sec-line { max-width: 40px; }
  .cta-panel { padding: 2rem 1.2rem; }
  .feature-card { padding: 1.3rem; }
  .brand-text { font-size: 0.92rem; white-space: normal; }
  .header-actions .btn-login { width: 40px; padding: 0; justify-content: center; }
  .header-actions .btn-login span { display: none; }
  .header-actions .btn-login .btn-icon { width: 18px; height: 18px; }
}

/* roulang page: article */
:root {
  --primary: #00D4FF;
  --primary-dark: #0099CC;
  --primary-light: #66E6FF;
  --green: #00FF88;
  --amber: #FFB020;
  --bg-page: #0A0F1A;
  --bg-section: #101826;
  --bg-panel: rgba(18, 28, 44, 0.66);
  --bg-overlay: rgba(8, 12, 20, 0.85);
  --text-main: #EAF2F8;
  --text-sub: #A7B8C8;
  --text-weak: #6F8294;
  --text-invert: #0A0F1A;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(0, 212, 255, 0.35);
  --radius: 12px;
  --radius-sm: 6px;
  --radius-btn: 8px;
  --radius-pill: 32px;
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.28);
  --shadow-hover: 0 12px 36px rgba(0, 212, 255, 0.12);
  --shadow-glow: 0 0 22px rgba(0, 212, 255, 0.35);
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  --nav-height: 64px;
  --spacing-section: 88px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-main);
  background: var(--bg-page);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 15px;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color 0.2s ease; }
img { max-width: 100%; display: block; }
button, input, textarea, select { font-family: inherit; font-size: 1rem; }
ul, ol { padding: 0; margin: 0; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 28px;
  border-radius: var(--radius-btn);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: all 0.25s ease;
  line-height: 1;
  white-space: nowrap;
}
.btn .btn-icon { width: 16px; height: 16px; transition: transform 0.25s ease; }
.btn:hover .btn-icon { transform: translateX(2px); }
.btn-primary {
  background: linear-gradient(135deg, #00D4FF, #0099CC);
  color: var(--text-invert);
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.30);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.55);
}
.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.20);
}
.btn-primary:disabled {
  filter: saturate(0.4);
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
}
.btn-outline {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.20);
  color: var(--text-main);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.10);
}
.btn-outline:active { transform: translateY(0); }
.btn-large { height: 54px; padding: 0 40px; font-size: 1rem; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  background: rgba(0, 212, 255, 0.12);
  color: var(--primary);
  border: 1px solid rgba(0, 212, 255, 0.2);
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.6;
  white-space: nowrap;
}
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-size: 0.72rem;
  line-height: 1.5;
}

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(10, 15, 26, 0.82);
  z-index: 1000;
  transition: background 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
}
.site-header.scrolled {
  background: rgba(10, 15, 26, 0.95);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color 0.2s;
}
.brand:hover { color: var(--primary); }
.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.8);
  flex-shrink: 0;
}
.brand-text { white-space: nowrap; }
.main-nav {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: nowrap;
}
.nav-link {
  color: var(--text-sub);
  font-size: 0.85rem;
  padding: 8px 2px;
  position: relative;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease;
}
.nav-link:hover { color: var(--text-main); }
.nav-link.active { color: var(--primary); border-bottom-color: var(--primary); }
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }
.cat-link { font-weight: 400; color: var(--text-weak); font-size: 0.82rem; }
.cat-link:hover { color: var(--primary); }
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}
.btn-login { height: 40px; padding: 0 20px; font-size: 0.85rem; }
.version-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-weak);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

.article-hero {
  padding: 130px 0 48px;
  background:
    linear-gradient(135deg, rgba(10, 15, 26, 0.92) 0%, rgba(10, 15, 26, 0.78) 100%),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.article-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 20% 20%, rgba(0, 212, 255, 0.06), transparent 50%);
  pointer-events: none;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-weak);
  margin-bottom: 28px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}
.breadcrumb a { color: var(--text-sub); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .bc-sep { color: var(--text-weak); opacity: 0.5; }
.breadcrumb .bc-current { color: var(--primary); max-width: 360px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.article-title {
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.02em;
  margin: 0 0 18px;
  position: relative;
  z-index: 1;
}
.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.83rem;
  color: var(--text-weak);
  position: relative;
  z-index: 1;
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.meta-item svg { width: 14px; height: 14px; opacity: 0.7; }

.article-main {
  padding: 56px 0 72px;
  background: var(--bg-page);
  position: relative;
}
.article-main::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(135deg, rgba(0, 212, 255, 0.03) 25%, transparent 25%),
    linear-gradient(45deg, rgba(0, 212, 255, 0.02) 25%, transparent 25%);
  background-size: 80px 80px;
  pointer-events: none;
}
.article-content-col { position: relative; }
.article-content-panel {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 44px;
  box-shadow: var(--shadow-card);
  position: relative;
}
.article-content-panel::before {
  content: "";
  position: absolute;
  top: 0; left: 24px; right: 24px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.10), transparent);
  border-radius: var(--radius) var(--radius) 0 0;
}
.article-content {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-main);
  word-break: break-word;
}
.article-content p { margin: 0 0 1.5em; text-align: justify; }
.article-content h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2em 0 0.8em;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 90px;
  line-height: 1.4;
}
.article-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.8em 0 0.6em;
  line-height: 1.5;
}
.article-content h4 { font-size: 1rem; font-weight: 600; margin: 1.5em 0 0.5em; }
.article-content img {
  max-width: 100%;
  border-radius: 10px;
  margin: 1.4em 0;
  box-shadow: var(--shadow-card);
}
.article-content blockquote {
  margin: 1.6em 0;
  padding: 16px 22px;
  background: #0D1420;
  border-left: 3px solid var(--primary);
  border-radius: 0 8px 8px 0;
  color: var(--text-sub);
  font-style: normal;
}
.article-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: #0D1420;
  padding: 2px 7px;
  border-radius: 4px;
  color: var(--primary-light);
}
.article-content pre {
  background: #0D1420;
  padding: 20px 22px;
  border-radius: 10px;
  overflow-x: auto;
  border-left: 3px solid var(--primary);
  margin: 1.6em 0;
  line-height: 1.7;
}
.article-content pre code { background: none; padding: 0; color: var(--text-main); }
.article-content ul, .article-content ol { margin: 1em 0 1.5em; padding-left: 1.6em; }
.article-content li { margin-bottom: 0.5em; }
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6em 0;
  font-size: 0.92rem;
}
.article-content th {
  background: rgba(16, 24, 38, 0.8);
  color: var(--text-sub);
  font-weight: 500;
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.article-content td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.article-content tr:last-child td { border-bottom: none; }
.article-content tr:hover td { background: rgba(0, 212, 255, 0.04); }
.article-content a { color: var(--primary); border-bottom: 1px solid rgba(0, 212, 255, 0.3); }
.article-content a:hover { color: var(--primary-light); border-bottom-color: var(--primary); }
.article-nav-bottom {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.article-nav-bottom .btn { height: 40px; padding: 0 20px; font-size: 0.85rem; }

.article-sidebar-col {
  position: sticky;
  top: 88px;
  align-self: start;
}
.toc-card {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-card);
  position: relative;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.toc-card::before {
  content: "";
  position: absolute;
  top: 12px; left: 12px;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}
.toc-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-main);
  padding-left: 8px;
}
.toc-list { list-style: none; margin: 0; padding: 0; max-height: 460px; overflow-y: auto; }
.toc-list li { margin-bottom: 2px; }
.toc-list a {
  display: block;
  padding: 6px 10px;
  border-left: 2px solid transparent;
  font-size: 0.85rem;
  color: var(--text-sub);
  transition: all 0.2s ease;
  border-radius: 0 4px 4px 0;
}
.toc-list a:hover { color: var(--primary); border-left-color: var(--primary); background: rgba(0, 212, 255, 0.04); }
.toc-list a.active { color: var(--primary); border-left-color: var(--primary); background: rgba(0, 212, 255, 0.06); }

.not-found {
  text-align: center;
  padding: 72px 24px;
}
.nf-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  font-size: 2rem;
  margin-bottom: 24px;
  color: var(--primary);
}
.not-found h2 { font-size: 1.5rem; margin: 0 0 12px; color: var(--text-main); }
.not-found p { color: var(--text-sub); margin: 0 0 32px; max-width: 360px; margin-left: auto; margin-right: auto; }

.related-section {
  padding: var(--spacing-section) 0;
  background: var(--bg-section);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section-title-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 10px;
}
.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--primary);
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.section-title {
  font-size: 1.45rem;
  font-weight: 600;
  margin: 0;
  color: var(--text-main);
  line-height: 1.3;
}
.section-line {
  flex: 0 0 64px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), transparent);
}
.section-desc {
  color: var(--text-sub);
  font-size: 0.9rem;
  margin: 8px 0 0;
  max-width: 640px;
}
.related-grid { margin-top: 32px; }
.related-card {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.25s ease;
  position: relative;
  display: block;
  height: 100%;
  box-shadow: var(--shadow-card);
}
.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}
.related-card::before {
  content: "";
  position: absolute;
  top: 10px; left: 10px;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
  z-index: 2;
  transition: background 0.2s;
}
.related-card:hover::before { background: var(--green); box-shadow: 0 0 8px rgba(0, 255, 136, 0.6); }
.related-thumb {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  position: relative;
  background: #0D1420;
}
.related-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.related-card:hover .related-thumb img { transform: scale(1.03); }
.related-thumb::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 24px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.5));
}
.related-info { padding: 18px 20px 20px; }
.related-card .tag { margin-bottom: 10px; }
.related-card-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  line-height: 1.5;
  margin: 8px 0 14px;
  transition: color 0.2s;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related-card:hover .related-card-title { color: var(--primary); }
.related-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-weak);
}
.related-time { font-family: var(--font-mono); }

.cta-final {
  padding: var(--spacing-section) 0;
  background: var(--bg-page);
  position: relative;
}
.cta-card {
  background: linear-gradient(135deg, rgba(18, 28, 44, 0.85), rgba(10, 20, 32, 0.6));
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 16px;
  padding: 56px 48px;
  text-align: center;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.cta-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(0, 212, 255, 0.08), transparent 60%);
  pointer-events: none;
}
.cta-card > * { position: relative; z-index: 1; }
.cta-card h2 {
  font-size: 1.6rem;
  font-weight: 600;
  margin: 0 0 12px;
  line-height: 1.4;
}
.cta-card p {
  color: var(--text-sub);
  font-size: 0.95rem;
  margin: 0 0 32px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}
.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer {
  background: #070B12;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 56px 0 0;
  position: relative;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
}
.footer-desc {
  color: var(--text-weak);
  font-size: 0.85rem;
  line-height: 1.8;
  margin: 0;
  max-width: 400px;
}
.footer-col-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  color: var(--text-sub);
  font-size: 0.85rem;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.footer-links a:hover { color: var(--primary); transform: translateX(2px); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text-weak);
}
.footer-copyright { color: var(--text-weak); }
.footer-icp { font-family: var(--font-mono); color: var(--text-weak); font-size: 0.72rem; }

.float-cta {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, #00D4FF, #0099CC);
  color: var(--text-invert);
  font-weight: 600;
  font-size: 0.88rem;
  box-shadow: var(--shadow-glow);
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  overflow: hidden;
}
.float-cta svg { width: 16px; height: 16px; }
.float-cta.visible {
  opacity: 0.92;
  transform: translateY(0);
  pointer-events: auto;
}
.float-cta:hover {
  opacity: 1;
  box-shadow: 0 0 34px rgba(0, 212, 255, 0.5);
  transform: translateY(-2px);
}

.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 60px;
  background: rgba(8, 12, 20, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: 1px solid var(--border);
  z-index: 1100;
  align-items: center;
  justify-content: space-around;
  padding: 0 8px;
}
.m-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  font-size: 0.66rem;
  color: var(--text-weak);
  transition: color 0.2s;
  flex: 1;
  padding: 8px 2px;
}
.m-nav-item.active { color: var(--primary); }
.m-nav-item svg { width: 20px; height: 20px; }
.m-login-wrap { flex: 0 0 64px; display: flex; justify-content: center; align-items: center; }
.m-login-btn {
  width: 44px; height: 44px;
  border-radius: 50%;
  margin-top: -22px;
  background: linear-gradient(135deg, #00D4FF, #0099CC);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.5);
  color: var(--text-invert);
  transition: all 0.25s ease;
}
.m-login-btn:hover { box-shadow: 0 0 28px rgba(0, 212, 255, 0.7); transform: scale(1.04); }
.m-login-btn svg { width: 18px; height: 18px; }

 940px and 1024px */
@media (max-width: 1024px) {
  :root { --spacing-section: 72px; }
  .main-nav { gap: 0.6rem; }
  .nav-link { font-size: 0.8rem; }
  .cat-link { display: none; }
  .header-inner { gap: 1rem; }
  .article-content-panel { padding: 32px 30px; }
}
@media (max-width: 768px) {
  .article-hero { padding: 110px 0 36px; }
  .article-main { padding: 40px 0 56px; }
  .cta-card { padding: 40px 28px; }
  .cta-card h2 { font-size: 1.35rem; }
  .related-grid .cell { margin-bottom: 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-grid > div:first-child { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  :root { --nav-height: 56px; --spacing-section: 56px; }
  body { padding-bottom: 60px; }
  .site-header { height: 56px; }
  .main-nav, .version-badge { display: none; }
  .header-actions .btn-login { display: none; }
  .header-inner { justify-content: center; }
  .mobile-bottom-nav { display: flex; }
  .article-hero { padding: 90px 0 32px; }
  .breadcrumb { font-size: 0.75rem; margin-bottom: 20px; }
  .breadcrumb .bc-current { max-width: 200px; }
  .article-title { font-size: 1.5rem; line-height: 1.5; }
  .article-meta { gap: 10px; font-size: 0.78rem; flex-direction: column; align-items: flex-start; }
  .article-content-panel { padding: 24px 20px; border-radius: 10px; }
  .article-content { font-size: 0.95rem; line-height: 1.85; }
  .article-content h2 { font-size: 1.22rem; }
  .article-content h3 { font-size: 1.02rem; }
  .article-nav-bottom { gap: 10px; }
  .article-nav-bottom .btn { width: 100%; }
  .related-section { padding: 48px 0; }
  .section-title { font-size: 1.25rem; }
  .section-line { flex-basis: 40px; }
  .cta-final { padding: 48px 0; }
  .cta-card { padding: 32px 20px; border-radius: 12px; }
  .cta-card h2 { font-size: 1.2rem; }
  .cta-actions .btn { width: 100%; }
  .float-cta {
    right: 16px;
    bottom: 76px;
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 50%;
    justify-content: center;
  }
  .float-cta span { display: none; }
  .float-cta svg { width: 20px; height: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; padding-bottom: 24px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 4px; }
}
@media (max-width: 375px) {
  .article-content-panel { padding: 20px 16px; }
  .article-title { font-size: 1.35rem; }
  .cta-card h2 { font-size: 1.1rem; }
  .btn { padding: 0 22px; }
}

/* roulang page: category2 */
:root {
  --primary: #00D4FF;
  --primary-dark: #0099CC;
  --primary-light: #66E6FF;
  --success: #00FF88;
  --warning: #FFB020;
  --bg-page: #0A0F1A;
  --bg-section: #101826;
  --bg-panel: rgba(18, 28, 44, 0.66);
  --bg-overlay: rgba(8, 12, 20, 0.85);
  --text-main: #EAF2F8;
  --text-sub: #A7B8C8;
  --text-weak: #6F8294;
  --text-inverse: #0A0F1A;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(0, 212, 255, 0.35);
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-small: 6px;
  --radius-pill: 32px;
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.28);
  --shadow-hover: 0 12px 36px rgba(0, 212, 255, 0.12);
  --transition: 0.25s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", sans-serif;
  background: var(--bg-page);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 0.95rem;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color .25s ease; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul, ol { list-style: none; }
section { scroll-margin-top: 72px; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.mono { font-family: "JetBrains Mono", "Cascadia Code", Consolas, monospace; }

/* ===== 顶部导航 ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: 64px; background: rgba(10, 15, 26, 0.82);
  transition: background .3s ease, border-color .3s ease, backdrop-filter .3s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(10, 15, 26, 0.94);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.header-inner {
  max-width: 1320px; margin: 0 auto; height: 64px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 1.5rem;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.6);
}
.brand-text { font-size: 1.05rem; font-weight: 600; color: var(--text-main); letter-spacing: 0.02em; white-space: nowrap; }
.main-nav { display: flex; align-items: center; gap: 22px; }
.nav-link {
  position: relative; font-size: .88rem; color: var(--text-sub);
  padding: 6px 0; transition: color .25s ease; white-space: nowrap;
}
.nav-link:hover { color: var(--primary); }
.nav-link.active { color: var(--primary); }
.nav-link.active::after {
  content: ''; position: absolute; left: 0; bottom: -2px;
  width: 100%; height: 2px; background: var(--primary);
  border-radius: 2px;
}
.cat-link { font-size: .82rem; color: var(--text-weak); }
.cat-link:hover { color: var(--primary); }
.cat-link.active { color: var(--primary); }
.cat-link.active::after { content: ''; position: absolute; left: 0; bottom: -2px; width: 100%; height: 2px; background: var(--primary); }
.header-actions { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; border-radius: var(--radius-btn);
  transition: all .25s ease; text-decoration: none;
}
.btn-icon { width: 16px; height: 16px; transition: transform .25s ease; flex-shrink: 0; }
.btn-primary {
  height: 46px; padding: 0 28px;
  background: linear-gradient(135deg, #00D4FF, #0099CC);
  color: var(--text-inverse);
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.3);
  border: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.55);
}
.btn-primary:hover .btn-icon { transform: translateX(2px); }
.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.2);
}
.btn-outline {
  height: 46px; padding: 0 28px;
  background: transparent; border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-main);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.version-badge {
  font-size: .72rem; color: var(--text-weak);
  border: 1px solid var(--border); padding: 2px 10px;
  border-radius: var(--radius-pill); font-family: "JetBrains Mono", Consolas, monospace;
}

/* ===== Hero ===== */
.page-hero {
  position: relative; padding: 140px 0 80px;
  min-height: 420px; display: flex; align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-image: url('/assets/images/backpic/back-1.webp');
  background-size: cover; background-position: center;
}
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(85deg, rgba(10,15,26,0.92) 30%, rgba(10,15,26,0.65) 70%, rgba(10,15,26,0.55) 100%);
}
.hero-content { position: relative; z-index: 2; width: 100%; }
.breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: .82rem; color: var(--text-weak); margin-bottom: 28px;
}
.breadcrumb a { color: var(--text-weak); transition: color .25s; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .current { color: var(--primary); }
.breadcrumb .sep { color: var(--text-weak); opacity: .5; }
.page-hero h1 {
  font-size: 1.9rem; font-weight: 700; color: var(--text-main);
  letter-spacing: 0.02em; margin-bottom: 16px;
}
.hero-sub {
  font-size: 1rem; color: var(--text-sub);
  max-width: 640px; line-height: 1.75;
}
.hero-meta-tags { display: flex; gap: 10px; margin-top: 24px; flex-wrap: wrap; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .78rem; color: var(--text-sub);
  border: 1px solid var(--border); border-radius: var(--radius-pill);
  padding: 4px 14px; background: rgba(16, 24, 38, 0.4);
}
.hero-tag .tag-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--success); box-shadow: 0 0 6px rgba(0,255,136,.5); }
.hero-tag .tag-dot.warn { background: var(--warning); box-shadow: 0 0 6px rgba(255,176,32,.5); }

/* ===== 内容区 ===== */
.guide-main-section { padding: 88px 0 64px; background: var(--bg-page); }
.guide-main-section .grid-x { gap: 0; }
.guide-content-col { padding-right: 40px; }
.guide-content-col .fl {
  display: flex; align-items: flex-start; gap: 12px; margin-bottom: 16px;
}
.section-label {
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: .82rem; color: var(--primary); text-transform: uppercase;
  letter-spacing: .08em;
}
.section-line {
  flex: 1; height: 2px; background: linear-gradient(90deg, var(--primary), transparent);
  align-self: center; margin-left: 12px;
  min-width: 48px; display: inline-block;
}
.section-header { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.section-header h2 {
  font-size: 1.45rem; font-weight: 600; color: var(--text-main);
  margin: 0; white-space: nowrap;
}
.section-header .section-line { flex: 1; height: 2px; background: linear-gradient(90deg, var(--primary), transparent); }
.section-desc { font-size: .92rem; color: var(--text-sub); margin-bottom: 36px; }

/* ===== 步骤 ===== */
.steps-list { display: flex; flex-direction: column; gap: 28px; }
.step-item {
  position: relative;
  background: linear-gradient(135deg, rgba(18,28,44,0.82), rgba(10,20,32,0.55));
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 24px 28px 20px 28px;
  transition: box-shadow .3s ease, border-color .3s ease;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.step-item::before {
  content: '';
  position: absolute; top: 16px; left: 16px;
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0,212,255,.7);
}
.step-item:hover { border-color: var(--border-hover); box-shadow: var(--shadow-hover); }
.step-top { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 12px; }
.step-num {
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 2rem; font-weight: 700; color: var(--primary);
  line-height: 1; min-width: 64px;
  border-bottom: 2px solid var(--primary);
  padding-bottom: 4px; letter-spacing: .03em;
}
.step-title { font-size: 1.1rem; font-weight: 600; color: var(--text-main); margin-bottom: 8px; }
.step-desc { font-size: .92rem; color: var(--text-sub); line-height: 1.75; margin-bottom: 16px; }
.step-image {
  border-radius: 10px; overflow: hidden; margin-top: 12px;
  border: 1px solid var(--border); position: relative;
}
.step-image img { width: 100%; height: 200px; object-fit: cover; }
.step-image::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 40px;
  background: linear-gradient(transparent, rgba(10,15,26,.4));
  pointer-events: none;
}

/* ===== 侧栏卡片 ===== */
.guide-sidebar { display: flex; flex-direction: column; gap: 24px; }
.side-card {
  background: linear-gradient(135deg, rgba(18,28,44,0.82), rgba(10,20,32,0.55));
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-card);
  position: relative;
  transition: border-color .3s ease, box-shadow .3s ease;
}
.side-card::before {
  content: '';
  position: absolute; top: 16px; left: 16px;
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--primary);
}
.side-card:hover { border-color: var(--border-hover); box-shadow: var(--shadow-hover); }
.side-card-title {
  font-size: 1rem; font-weight: 600; color: var(--text-main);
  margin-bottom: 14px; display: flex; align-items: center; gap: 8px;
}
.side-card-title .ico {
  width: 18px; height: 18px; color: var(--primary);
}
.side-list { display: flex; flex-direction: column; gap: 10px; }
.side-list li {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: .88rem; color: var(--text-sub); line-height: 1.5;
}
.side-list li::before {
  content: ''; flex-shrink: 0; width: 5px; height: 5px;
  border-radius: 50%; background: var(--primary);
  margin-top: 8px; box-shadow: 0 0 6px rgba(0,212,255,.4);
}
.side-status-list { display: flex; flex-direction: column; gap: 12px; }
.side-status-item { display: flex; align-items: center; gap: 12px; font-size: .88rem; color: var(--text-sub); }
.status-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.status-dot.online { background: var(--success); box-shadow: 0 0 8px rgba(0,255,136,.5); }
.status-dot.idle { background: var(--warning); box-shadow: 0 0 8px rgba(255,176,32,.5); }
.status-dot.offline { background: var(--text-weak); }
.side-status-label { font-weight: 600; color: var(--text-main); min-width: 44px; }
.side-tip {
  font-size: .82rem; color: var(--text-weak);
  background: rgba(255,176,32,.08);
  border: 1px solid rgba(255,176,32,.2);
  border-radius: var(--radius-small);
  padding: 10px 12px; margin-top: 12px; line-height: 1.6;
}

/* ===== FAQ 小型手风琴 ===== */
.mini-faq { margin-top: 42px; }
.mini-faq .faq-item {
  background: rgba(16,24,38,0.72);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  margin-bottom: 12px; transition: border-color .3s ease;
}
.mini-faq .faq-item:hover { border-color: rgba(255,255,255,.16); }
.mini-faq .faq-question {
  width: 100%; display: flex; align-items: center; gap: 14px;
  padding: 16px 20px; font-size: .92rem; font-weight: 600;
  color: var(--text-main); background: transparent; text-align: left;
  min-height: 52px; transition: color .25s;
}
.mini-faq .faq-question:hover { color: var(--primary); }
.mini-faq .faq-num {
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: .9rem; color: var(--primary);
  min-width: 28px;
}
.mini-faq .faq-icon { margin-left: auto; font-size: 1rem; color: var(--text-weak); transition: transform .25s ease; flex-shrink: 0; }
.mini-faq .faq-item.is-active .faq-icon { transform: rotate(45deg); }
.mini-faq .faq-answer { display: none; padding: 0 20px 16px 62px; font-size: .88rem; color: var(--text-sub); line-height: 1.75; }

/* ===== 相关卡片 ===== */
.related-section { padding: 80px 0; background: var(--bg-section); }
.related-section .section-header { margin-bottom: 28px; }
.related-card {
  background: linear-gradient(135deg, rgba(18,28,44,0.82), rgba(10,20,32,0.55));
  border: 1px solid var(--border); border-radius: var(--radius-card);
  overflow: hidden; box-shadow: var(--shadow-card);
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
  position: relative; height: 100%;
}
.related-card::before {
  content: ''; position: absolute; top: 16px; left: 16px; z-index: 2;
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--primary); box-shadow: 0 0 8px rgba(0,212,255,.7);
}
.related-card:hover { transform: translateY(-4px); border-color: var(--border-hover); box-shadow: var(--shadow-hover); }
.related-card:hover::before { background: var(--success); box-shadow: 0 0 8px rgba(0,255,136,.6); }
.related-card .card-img { width: 100%; height: 180px; object-fit: cover; }
.related-card .card-body { padding: 20px; }
.related-card .card-tag {
  display: inline-block; font-size: .75rem; color: var(--primary);
  border: 1px solid rgba(0,212,255,.3);
  border-radius: var(--radius-pill); padding: 2px 10px; margin-bottom: 10px;
  background: rgba(0,212,255,.06);
}
.related-card h3 { font-size: 1rem; font-weight: 600; color: var(--text-main); margin-bottom: 8px; line-height: 1.5; }
.related-card p { font-size: .85rem; color: var(--text-sub); line-height: 1.65; margin-bottom: 14px; }
.related-card .card-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .82rem; color: var(--primary); transition: gap .25s ease;
}
.related-card .card-link:hover { gap: 10px; }

/* ===== CTA ===== */
.cta-section { padding: 88px 0 96px; background: var(--bg-page); position: relative; }
.cta-card {
  background: linear-gradient(135deg, rgba(18,28,44,0.82), rgba(10,20,32,0.55));
  border: 1px solid var(--border); border-radius: 16px;
  padding: 64px 40px; text-align: center; position: relative;
  overflow: hidden; box-shadow: 0 12px 36px rgba(0,0,0,.35);
}
.cta-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
}
.cta-card h2 { font-size: 1.6rem; font-weight: 700; color: var(--text-main); margin-bottom: 12px; }
.cta-card p { color: var(--text-sub); font-size: .95rem; margin-bottom: 28px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-btn-group { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

/* ===== 页脚 ===== */
.site-footer {
  background: #070B12; border-top: 1px solid rgba(255,255,255,0.05);
  padding: 56px 0 28px;
}
.footer-inner { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; margin-bottom: 36px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-desc { font-size: .85rem; color: var(--text-weak); line-height: 1.75; max-width: 360px; }
.footer-col-title { font-size: .92rem; font-weight: 600; color: var(--text-main); margin-bottom: 14px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: .85rem; color: var(--text-sub); transition: color .25s ease, padding-left .25s ease; }
.footer-links a:hover { color: var(--primary); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.05);
  padding-top: 20px; display: flex; justify-content: space-between;
  align-items: center; flex-wrap: wrap; gap: 12px;
}
.footer-copyright { font-size: .8rem; color: var(--text-weak); }
.footer-icp { font-size: .78rem; color: var(--text-weak); font-family: "JetBrains Mono", Consolas, monospace; }

/* ===== 浮动 CTA ===== */
.float-cta {
  position: fixed; right: 28px; bottom: 28px; z-index: 999;
  display: inline-flex; align-items: center; gap: 8px;
  height: 48px; padding: 0 24px;
  background: linear-gradient(135deg, #00D4FF, #0099CC);
  color: var(--text-inverse); border-radius: var(--radius-pill);
  font-size: .88rem; font-weight: 600;
  box-shadow: 0 0 22px rgba(0,212,255,0.35);
  transition: transform .25s ease, box-shadow .25s ease;
  opacity: 0; visibility: hidden; transform: translateY(16px);
  text-shadow: none;
}
.float-cta.visible { opacity: .95; visibility: visible; transform: translateY(0); }
.float-cta:hover { transform: translateY(-2px); box-shadow: 0 0 34px rgba(0,212,255,0.55); }
.float-cta .btn-icon { width: 16px; height: 16px; }

/* ===== 移动端底部导航 ===== */
.mobile-bottom-nav {
  display: none;
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 999;
  height: 60px; background: rgba(10,15,26,.96);
  border-top: 1px solid rgba(255,255,255,.08);
  backdrop-filter: blur(14px);
  align-items: center; justify-content: space-around;
  padding: 0 12px;
}
.mobile-bottom-nav a {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  font-size: .68rem; color: var(--text-sub); text-decoration: none;
  transition: color .25s;
}
.mobile-bottom-nav a .m-icon { width: 20px; height: 20px; }
.mobile-bottom-nav a.active { color: var(--primary); }
.mobile-bottom-nav .m-login-btn {
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, #00D4FF, #0099CC);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 20px rgba(0,212,255,.5);
  margin-top: -18px; color: var(--text-inverse);
}
.mobile-bottom-nav .m-login-btn svg { width: 20px; height: 20px; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .main-nav { gap: 14px; }
  .nav-link { font-size: .82rem; }
  .cat-link { display: none; }
  .guide-content-col { padding-right: 24px; }
}
@media (max-width: 768px) {
  .page-hero { padding: 110px 0 56px; min-height: auto; }
  .page-hero h1 { font-size: 1.6rem; }
  .guide-main-section { padding: 60px 0 48px; }
  .guide-content-col { padding-right: 0; margin-bottom: 32px; }
  .step-item { padding: 20px 18px; }
  .step-num { font-size: 1.6rem; min-width: 48px; }
  .step-image img { height: 160px; }
  .related-section { padding: 56px 0; }
  .cta-section { padding: 56px 0; }
  .cta-card { padding: 40px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .header-actions .btn-login span { display: none; }
  .header-actions .btn-login { padding: 0 16px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .float-cta { right: 16px; bottom: 80px; padding: 0 18px; }
}
@media (max-width: 520px) {
  .main-nav { gap: 8px; }
  .main-nav .nav-link { font-size: .78rem; }
  .main-nav .nav-link[href="#features"] { display: none; }
  .main-nav .nav-link[href="#proof"] { display: none; }
  .header-actions .version-badge { display: none; }
  .header-actions .btn-login { padding: 0 14px; height: 40px; }
  .header-inner { padding: 0 1rem; }
  .brand-text { font-size: .95rem; }
  .page-hero h1 { font-size: 1.45rem; }
  .breadcrumb { font-size: .75rem; margin-bottom: 20px; }
  .section-header h2 { font-size: 1.2rem; }
  .section-header { flex-wrap: wrap; gap: 8px; }
  .section-header .section-line { display: none; }
  .mobile-bottom-nav { display: flex; }
  .site-footer { padding-bottom: 88px; }
  .float-cta { display: none; }
}
@media (max-width: 375px) {
  .page-hero h1 { font-size: 1.3rem; }
  .hero-sub { font-size: .88rem; }
  .guide-main-section { padding: 44px 0 40px; }
  .cta-card h2 { font-size: 1.25rem; }
  .cta-btn-group .btn { width: 100%; }
}

/* roulang page: category3 */
:root {
      --primary: #00D4FF;
      --primary-dark: #0099CC;
      --primary-light: #66E6FF;
      --success: #00FF88;
      --warning: #FFB020;
      --bg-page: #0A0F1A;
      --bg-section: #101826;
      --bg-panel: rgba(18, 28, 44, 0.66);
      --bg-overlay: rgba(8, 12, 20, 0.85);
      --text-main: #EAF2F8;
      --text-sub: #A7B8C8;
      --text-weak: #6F8294;
      --text-invert: #0A0F1A;
      --border-color: rgba(255, 255, 255, 0.08);
      --border-hover: rgba(0, 212, 255, 0.35);
      --radius-card: 12px;
      --radius-small: 6px;
      --radius-btn: 8px;
      --radius-pill: 32px;
      --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.28);
      --shadow-hover: 0 12px 36px rgba(0, 212, 255, 0.12);
      --shadow-glow: 0 0 22px rgba(0, 212, 255, 0.35);
      --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", sans-serif;
      --font-mono: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
    }

    *,
    *::before,
    *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 72px;
    }

    body {
      font-family: var(--font-main);
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 0.95rem;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: 10px;
    }

    button,
    input,
    select,
    textarea {
      font-family: inherit;
      font-size: inherit;
      line-height: inherit;
      border: none;
      outline: none;
    }

    .grid-container {
      max-width: 1200px;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 999;
      height: 64px;
      background: rgba(10, 15, 26, 0.82);
      transition: background 0.3s ease, backdrop-filter 0.3s ease, border-color 0.3s ease;
    }

    .site-header.scrolled {
      background: rgba(10, 15, 26, 0.96);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      height: 100%;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .brand-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary);
      flex-shrink: 0;
    }

    .brand-text {
      font-size: 1.1rem;
      font-weight: 700;
      letter-spacing: 0.02em;
      color: var(--text-main);
      white-space: nowrap;
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      flex-wrap: nowrap;
      overflow-x: auto;
      scrollbar-width: none;
    }

    .main-nav::-webkit-scrollbar {
      display: none;
    }

    .nav-link {
      position: relative;
      display: inline-block;
      padding: 6px 10px;
      color: var(--text-sub);
      font-size: 0.9rem;
      white-space: nowrap;
      border-bottom: 2px solid transparent;
      transition: color 0.25s ease, border-color 0.25s ease;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--text-main);
    }

    .nav-link.active {
      border-bottom-color: var(--primary);
    }

    .nav-link.cat-link {
      font-size: 0.85rem;
      color: var(--text-weak);
    }

    .nav-link.cat-link:hover,
    .nav-link.cat-link.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .version-badge {
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--text-weak);
      padding: 3px 10px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-pill);
      background: rgba(255, 255, 255, 0.03);
      white-space: nowrap;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      text-decoration: none;
      line-height: 1;
    }

    .btn svg {
      width: 16px;
      height: 16px;
      flex-shrink: 0;
      transition: transform 0.25s ease;
    }

    .btn:hover .btn-icon {
      transform: translateX(2px);
    }

    .btn-primary {
      height: 46px;
      padding: 0 28px;
      background: linear-gradient(135deg, #00D4FF, #0099CC);
      color: var(--text-invert);
      box-shadow: 0 0 18px rgba(0, 212, 255, 0.30);
      font-size: 0.95rem;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(0, 212, 255, 0.55);
    }

    .btn-primary:active {
      transform: translateY(1px);
      box-shadow: 0 0 10px rgba(0, 212, 255, 0.20);
    }

    .btn-outline {
      height: 46px;
      padding: 0 28px;
      background: transparent;
      color: var(--text-main);
      border: 1px solid rgba(255, 255, 255, 0.2);
      font-size: 0.95rem;
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    .btn-large {
      height: 54px;
      padding: 0 40px;
      font-size: 1rem;
    }

    .btn-icon {
      margin-right: 8px;
    }

    .page-hero {
      position: relative;
      min-height: 420px;
      display: flex;
      align-items: flex-end;
      padding: 120px 0 56px;
      background: linear-gradient(180deg, rgba(10, 15, 26, 0.65) 20%, rgba(10, 15, 26, 0.92) 100%), url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
      border-bottom: 1px solid var(--border-color);
    }

    .page-hero .hero-inner {
      width: 100%;
    }

    .page-hero h1 {
      font-size: 1.9rem;
      font-weight: 700;
      letter-spacing: 0.02em;
      margin-bottom: 14px;
      color: var(--text-main);
    }

    .page-hero p {
      font-size: 1rem;
      color: var(--text-sub);
      max-width: 680px;
      margin-bottom: 24px;
      line-height: 1.75;
    }

    .hero-actions {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
    }

    .breadcrumb {
      font-size: 0.82rem;
      color: var(--text-weak);
      padding: 24px 0 8px;
      max-width: 1200px;
      margin: 0 auto;
      width: 100%;
    }

    .breadcrumb a {
      color: var(--text-weak);
    }

    .breadcrumb a:hover {
      color: var(--primary);
    }

    .breadcrumb .current {
      color: var(--primary);
    }

    .breadcrumb i {
      margin: 0 8px;
      font-size: 0.7rem;
      color: var(--text-weak);
    }

    .section-safe {
      padding: 56px 0 72px;
      background: var(--bg-page);
    }

    .section-safe .grid-container {
      position: relative;
    }

    .two-col-layout {
      display: grid;
      grid-template-columns: 1fr 360px;
      gap: 36px;
      margin-top: 32px;
    }

    .main-content-safe .section-title {
      font-size: 1.45rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .main-content-safe .section-desc {
      color: var(--text-sub);
      font-size: 0.95rem;
      margin-bottom: 28px;
      line-height: 1.8;
    }

    .data-card-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 36px;
    }

    .data-card {
      position: relative;
      background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
      overflow: hidden;
    }

    .data-card::before {
      content: '';
      position: absolute;
      top: 14px;
      left: 14px;
      width: 4px;
      height: 4px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 8px var(--primary);
      transition: background 0.3s ease;
    }

    .data-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-hover);
      box-shadow: var(--shadow-hover);
    }

    .data-card:hover::before {
      background: var(--success);
      box-shadow: 0 0 10px var(--success);
    }

    .data-card .data-num {
      font-family: var(--font-mono);
      font-size: 1.9rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 8px;
    }

    .data-card .data-label {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .data-card .data-desc {
      font-size: 0.82rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    .safe-steps {
      margin-top: 12px;
      margin-bottom: 36px;
    }

    .safe-steps .steps-header {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 18px;
    }

    .safe-step-item {
      display: flex;
      gap: 16px;
      padding: 14px 0;
      border-bottom: 1px solid var(--border-color);
      transition: background 0.25s ease, transform 0.25s ease;
      align-items: flex-start;
    }

    .safe-step-item:last-child {
      border-bottom: none;
    }

    .safe-step-item:hover {
      background: rgba(0, 212, 255, 0.03);
      transform: translateX(4px);
    }

    .safe-step-num {
      font-family: var(--font-mono);
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--primary);
      border-bottom: 2px solid var(--primary);
      padding-bottom: 4px;
      min-width: 36px;
      text-align: center;
      line-height: 1.2;
    }

    .safe-step-text {
      flex: 1;
    }

    .safe-step-text strong {
      display: block;
      color: var(--text-main);
      font-size: 0.98rem;
      margin-bottom: 4px;
    }

    .safe-step-text p {
      color: var(--text-sub);
      font-size: 0.88rem;
      line-height: 1.65;
      margin: 0;
    }

    .safe-image-block {
      margin: 20px 0 30px;
      position: relative;
    }

    .safe-image-block img {
      width: 100%;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
    }

    .safe-image-block .img-caption {
      font-size: 0.8rem;
      color: var(--text-weak);
      text-align: center;
      padding: 12px 0 0;
    }

    .side-panel {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .panel-card {
      background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 26px 24px;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
      position: relative;
    }

    .panel-card:hover {
      border-color: var(--border-hover);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .panel-card .panel-title {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 18px;
    }

    .panel-card .panel-title i {
      color: var(--primary);
      font-size: 1rem;
    }

    .summary-list {
      list-style: none;
    }

    .summary-list li {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 0.88rem;
    }

    .summary-list li:last-child {
      border-bottom: none;
    }

    .summary-list .key {
      color: var(--text-sub);
    }

    .summary-list .val {
      color: var(--text-main);
      font-family: var(--font-mono);
      font-size: 0.85rem;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .summary-list .val .dot-online {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: var(--success);
      box-shadow: 0 0 8px var(--success);
      display: inline-block;
    }

    .panel-cta {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 18px;
    }

    .panel-cta .btn {
      width: 100%;
      height: 44px;
    }

    .side-note {
      font-size: 0.8rem;
      color: var(--text-weak);
      line-height: 1.6;
      margin-top: 14px;
      padding-top: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
    }

    .related-section {
      padding: 56px 0 80px;
      background: var(--bg-section);
      position: relative;
    }

    .related-section .grid-container {
      position: relative;
      z-index: 2;
    }

    .related-header {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      margin-bottom: 32px;
    }

    .related-header .related-label {
      font-size: 0.82rem;
      color: var(--primary);
      font-family: var(--font-mono);
      letter-spacing: 0.08em;
      text-transform: uppercase;
      margin-bottom: 4px;
    }

    .related-header h2 {
      font-size: 1.45rem;
      font-weight: 600;
      color: var(--text-main);
      margin: 0;
    }

    .related-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .rel-card {
      position: relative;
      background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .rel-card::before {
      content: '';
      position: absolute;
      top: 12px;
      left: 12px;
      width: 4px;
      height: 4px;
      border-radius: 50%;
      background: var(--primary);
      z-index: 3;
      box-shadow: 0 0 8px var(--primary);
      transition: background 0.3s ease;
    }

    .rel-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-hover);
      box-shadow: var(--shadow-hover);
    }

    .rel-card:hover::before {
      background: var(--success);
      box-shadow: 0 0 10px var(--success);
    }

    .rel-card .rel-img {
      position: relative;
      aspect-ratio: 16 / 9;
      overflow: hidden;
    }

    .rel-card .rel-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: 0;
      transition: transform 0.4s ease;
    }

    .rel-card:hover .rel-img img {
      transform: scale(1.05);
    }

    .rel-card .rel-img::after {
      content: '';
      position: absolute;
      left: 0;
      right: 0;
      bottom: 0;
      height: 40%;
      background: linear-gradient(180deg, transparent, rgba(10, 15, 26, 0.72));
    }

    .rel-card .rel-body {
      padding: 22px 22px 26px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }

    .rel-card .rel-badge {
      display: inline-block;
      align-self: flex-start;
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      background: rgba(0, 212, 255, 0.12);
      color: var(--primary);
      border: 1px solid rgba(0, 212, 255, 0.2);
      margin-bottom: 12px;
    }

    .rel-card .rel-title {
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      line-height: 1.5;
      margin-bottom: 8px;
      transition: color 0.25s ease;
    }

    .rel-card a.rel-link:hover .rel-title {
      color: var(--primary);
    }

    .rel-card .rel-excerpt {
      font-size: 0.85rem;
      color: var(--text-sub);
      line-height: 1.65;
      margin-bottom: 14px;
      flex: 1;
    }

    .rel-card .rel-meta {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.78rem;
      color: var(--text-weak);
    }

    .rel-card .rel-arrow {
      margin-left: auto;
      color: var(--primary);
      font-size: 0.9rem;
      transition: transform 0.3s ease;
    }

    .rel-card:hover .rel-arrow {
      transform: translateX(4px);
    }

    .cta-band {
      background: linear-gradient(135deg, rgba(18, 28, 44, 0.82), rgba(10, 20, 32, 0.55));
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 72px 0;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .cta-band::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 50% 80%, rgba(0, 212, 255, 0.12), transparent 60%);
      pointer-events: none;
    }

    .cta-band h2 {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .cta-band p {
      color: var(--text-sub);
      font-size: 0.95rem;
      margin-bottom: 28px;
      max-width: 560px;
      margin-left: auto;
      margin-right: auto;
    }

    .cta-actions {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .site-footer {
      background: #070B12;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding: 48px 0 0;
    }

    .footer-inner {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      padding: 24px 0 36px;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 14px;
    }

    .footer-brand .brand-text {
      font-size: 1.05rem;
      color: var(--text-main);
    }

    .footer-desc {
      font-size: 0.85rem;
      color: var(--text-weak);
      line-height: 1.8;
      max-width: 360px;
    }

    .footer-col-title {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links a {
      font-size: 0.85rem;
      color: var(--text-sub);
      transition: color 0.25s ease, transform 0.25s ease;
    }

    .footer-links a:hover {
      color: var(--primary);
      transform: translateX(2px);
    }

    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 20px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.04);
      font-size: 0.78rem;
      color: var(--text-weak);
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-copyright {
      color: var(--text-weak);
    }

    .footer-icp {
      font-family: var(--font-mono);
      color: var(--text-weak);
    }

    .float-cta {
      position: fixed;
      right: 28px;
      bottom: 28px;
      z-index: 999;
      transform: translateY(20px);
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.4s ease, transform 0.4s ease, visibility 0.4s ease;
      box-shadow: var(--shadow-glow);
    }

    .float-cta.show {
      opacity: 0.92;
      transform: translateY(0);
      visibility: visible;
    }

    .float-cta .btn {
      height: 52px;
      padding: 0 32px;
      border-radius: var(--radius-pill);
      background: linear-gradient(135deg, #00D4FF, #0099CC);
      color: var(--text-invert);
      font-weight: 600;
    }

    .mobile-tabbar {
      display: none;
    }

    .section-title-group {
      display: flex;
      align-items: flex-end;
      gap: 18px;
      margin-bottom: 20px;
    }

    .section-title-label {
      font-family: var(--font-mono);
      font-size: 0.82rem;
      color: var(--primary);
      letter-spacing: 0.06em;
      text-transform: uppercase;
      padding-bottom: 6px;
    }

    .section-title-line {
      width: 64px;
      height: 2px;
      background: linear-gradient(90deg, var(--primary), transparent);
      margin-bottom: 8px;
    }

    .back-to-home {
      margin-top: 40px;
    }

    @media (max-width: 1024px) {
      .main-nav {
        gap: 0.2rem;
      }

      .nav-link {
        padding: 6px 6px;
        font-size: 0.82rem;
      }

      .nav-link.cat-link {
        font-size: 0.8rem;
      }

      .version-badge {
        display: none;
      }

      .two-col-layout {
        grid-template-columns: 1fr;
      }

      .related-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .site-header {
        display: none;
      }

      .page-hero {
        min-height: auto;
        padding: 72px 0 40px;
      }

      .page-hero h1 {
        font-size: 1.6rem;
      }

      .page-hero p {
        font-size: 0.9rem;
      }

      .hero-actions {
        flex-direction: column;
        align-items: flex-start;
      }

      .hero-actions .btn {
        width: 100%;
      }

      .section-safe {
        padding: 40px 0 56px;
      }

      .data-card-grid {
        grid-template-columns: 1fr;
      }

      .related-grid {
        grid-template-columns: 1fr;
      }

      .cta-band {
        padding: 48px 0;
      }

      .cta-band h2 {
        font-size: 1.3rem;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
      }

      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }

      .float-cta {
        right: 16px;
        bottom: 86px;
      }

      .float-cta .btn {
        width: 48px;
        height: 48px;
        padding: 0;
        border-radius: 50%;
        justify-content: center;
        font-size: 0;
      }

      .float-cta .btn .btn-icon {
        margin: 0;
        width: 18px;
        height: 18px;
      }

      .mobile-tabbar {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: 60px;
        background: rgba(8, 12, 20, 0.92);
        backdrop-filter: blur(18px);
        -webkit-backdrop-filter: blur(18px);
        border-top: 1px solid rgba(255, 255, 255, 0.07);
        z-index: 999;
        align-items: center;
        justify-content: space-around;
        padding: 0 12px;
      }

      .tab-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 3px;
        color: var(--text-weak);
        font-size: 0.7rem;
        text-decoration: none;
        padding: 4px 12px;
        border-radius: var(--radius-small);
        transition: color 0.25s ease, background 0.25s ease;
      }

      .tab-item i {
        font-size: 1.1rem;
        line-height: 1;
      }

      .tab-item:hover,
      .tab-item.active {
        color: var(--primary);
        background: rgba(0, 212, 255, 0.08);
      }

      .tab-login-btn {
        width: 44px;
        height: 44px;
        border-radius: 50%;
        background: linear-gradient(135deg, #00D4FF, #0099CC);
        color: var(--text-invert);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.1rem;
        box-shadow: 0 0 18px rgba(0, 212, 255, 0.45);
        transform: translateY(-8px);
        transition: transform 0.25s ease, box-shadow 0.25s ease;
      }

      .tab-login-btn:hover {
        transform: translateY(-10px);
        box-shadow: 0 0 26px rgba(0, 212, 255, 0.65);
      }

      .breadcrumb {
        padding-left: 1.25rem;
        padding-right: 1.25rem;
      }

      .grid-container {
        padding-left: 1.25rem;
        padding-right: 1.25rem;
      }
    }

    @media (max-width: 520px) {
      .section-title-group {
        flex-wrap: wrap;
      }

      .related-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
      }

      .safe-step-num {
        min-width: 30px;
        font-size: 1rem;
      }

      .data-card {
        padding: 22px 18px;
      }

      .panel-card {
        padding: 20px 18px;
      }

      .cta-actions {
        flex-direction: column;
      }

      .cta-actions .btn {
        width: 100%;
      }

      .page-hero {
        padding-top: 56px;
      }
    }