/* ── CSS Custom Properties ───────────────────────────────── */
:root {
  /* Dark theme (default) */
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --bg-card: #141414;
  --bg-card-hover: #1c1c1c;
  --border-color: #222222;
  --border-hover: #333333;
  --text-primary: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-tertiary: #6e6e73;
  --accent: #34C759;
  --accent-hover: #4dd875;
  --accent-dim: rgba(52, 199, 89, 0.15);
  --accent-glow: rgba(52, 199, 89, 0.3);
  --accent-soft: rgba(52, 199, 89, 0.08);
  --danger: #FF3B30;
  --warning: #FF9500;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', Consolas, monospace;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
  --max-width: 1200px;
  --nav-height: 64px;
  /* Theme-aware faint surfaces */
  --nav-bg: rgba(10, 10, 10, 0.8);
  --nav-bg-scrolled: rgba(10, 10, 10, 0.92);
  --border-faint: rgba(255, 255, 255, 0.06);
  --border-fainter: rgba(255, 255, 255, 0.04);
  --hover-overlay: rgba(255, 255, 255, 0.06);
  --mobile-menu-bg: rgba(10, 10, 10, 0.96);
  --dot-base-alpha: 0.16;
}

/* Light theme */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f7;
  --bg-tertiary: #eef0f2;
  --bg-card: #ffffff;
  --bg-card-hover: #f5f5f7;
  --border-color: #e6e6ea;
  --border-hover: #d3d3d8;
  --text-primary: #1d1d1f;
  --text-secondary: #55555c;
  --text-tertiary: #86868b;
  --accent: #2da94a;
  --accent-hover: #34c759;
  --accent-dim: rgba(45, 169, 74, 0.12);
  --accent-glow: rgba(45, 169, 74, 0.26);
  --accent-soft: rgba(45, 169, 74, 0.07);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.07);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.09);
  --nav-bg: rgba(255, 255, 255, 0.8);
  --nav-bg-scrolled: rgba(255, 255, 255, 0.92);
  --border-faint: rgba(0, 0, 0, 0.07);
  --border-fainter: rgba(0, 0, 0, 0.05);
  --hover-overlay: rgba(0, 0, 0, 0.04);
  --mobile-menu-bg: rgba(255, 255, 255, 0.97);
  --dot-base-alpha: 0.10;
}

/* ── Reset & Base ───────────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition-normal), color var(--transition-normal);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--accent-hover); }

img { max-width: 100%; display: block; }

/* ── Navigation ─────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(16px, 4vw, 48px);
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-faint);
  transition: background var(--transition-normal), border-color var(--transition-normal);
}
.nav.nav--scrolled {
  background: var(--nav-bg-scrolled);
  border-bottom-color: var(--border-color);
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-logo {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.nav-logo .logo-accent {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 400;
  transition: color var(--transition-fast);
}
.nav-links a:hover {
  color: var(--text-primary);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--accent);
  color: #000 !important;
  font-size: 14px;
  font-weight: 600;
  border-radius: 20px;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.nav-cta:hover {
  background: var(--accent-hover);
  color: #000 !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.nav-theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}
.nav-theme-toggle svg { width: 18px; height: 18px; }

.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 4px;
}

.nav-icon-close {
  display: none;
}

.nav-mobile-toggle[aria-expanded="true"] .nav-icon-hamburger {
  display: none;
}

.nav-mobile-toggle[aria-expanded="true"] .nav-icon-close {
  display: block;
}

/* ── Sections common ────────────────────────────────────── */
.section {
  padding: clamp(60px, 10vw, 120px) clamp(16px, 4vw, 48px);
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 680px;
}

/* ── Hero Section ───────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-height) + 40px) clamp(16px, 4vw, 48px) 80px;
  text-align: center;
  overflow: hidden;
}

/* Dot-grid background (replaces the old radial-gradient halo) */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--bg-primary);
}
.hero-bg canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  -webkit-mask-image: radial-gradient(ellipse 75% 60% at 50% 45%, #000 0%, transparent 80%);
  mask-image: radial-gradient(ellipse 75% 60% at 50% 45%, #000 0%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(100%, 800px);
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--accent-soft);
  border: 1px solid rgba(52,199,89,0.15);
  border-radius: 20px;
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(36px, 7vw, 72px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 16px;
}
.hero-title .accent { color: var(--accent); }

.hero-subtitle {
  font-size: clamp(18px, 3vw, 24px);
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 12px;
}

.hero-tagline {
  font-size: clamp(14px, 1.8vw, 17px);
  color: var(--text-tertiary);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 40px;
}

.hero-badge-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.hero-badge-item:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  background: var(--accent-soft);
}

.hero-code {
  position: relative;
  max-width: 420px;
  margin: 0 auto 40px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.hero-code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
}

.hero-code-dots {
  display: flex;
  gap: 6px;
}
.hero-code-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-hover);
}

.hero-code-copy {
  background: none;
  border: none;
  color: var(--text-tertiary);
  font-size: 12px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}
.hero-code-copy:hover {
  color: var(--text-primary);
  background: var(--hover-overlay);
}
.hero-code-copy.copied {
  color: var(--accent);
}

.hero-code-body {
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.6;
}
.hero-code-body .prompt {
  color: var(--accent);
  margin-right: 8px;
}
.hero-code-body .comment {
  color: var(--text-tertiary);
  display: block;
  margin-top: 8px;
  font-size: 13px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  width: 100%;
}
.hero-stat {
  text-align: center;
}
.hero-stat-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}
.hero-stat-label {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 2px;
}
.hero-credits {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  width: 100%;
  margin-top: 32px;
}
.hero-credit {
  display: flex;
  align-items: center;
  gap: 12px;
}
.hero-credit-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
}
.hero-credit-info {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}
.hero-credit-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}
.hero-credit-role {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* ── Architecture section (flat) ────────────────────────── */
.architecture .arch-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.arch-card {
  padding: 28px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-normal), background var(--transition-normal);
}
.arch-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.arch-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
}
.arch-card-head h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.arch-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border-radius: var(--radius-sm);
  color: var(--accent);
}

.arch-flow {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}

.arch-node {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
}
.arch-node svg {
  width: 16px;
  height: 16px;
  color: var(--text-tertiary);
  flex-shrink: 0;
}
.arch-node--hl {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.arch-node--hl svg { color: var(--accent); }

.arch-edge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-left: 16px;
  font-size: 12px;
  color: var(--text-tertiary);
}
.arch-edge svg {
  width: 16px;
  height: 16px;
  color: var(--text-tertiary);
  transform: rotate(90deg);
}

.arch-desc {
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── Features section ───────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.feature-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 28px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}
.feature-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  box-shadow: 0 0 20px var(--accent-soft);
  transform: translateY(-2px);
}

.feature-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border-radius: var(--radius-sm);
  color: var(--accent);
}

.feature-info h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.feature-info p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Connect section ────────────────────────────────────── */
.connect .tech-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
}

.tech-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 40px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.tech-badge:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.tech-badge svg {
  width: 16px;
  height: 16px;
}

/* ── Security section ───────────────────────────────────── */
.security-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.security-card {
  padding: 28px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-normal);
}
.security-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.security-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border-radius: 50%;
  color: var(--accent);
}

.security-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.security-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── CTA Section ────────────────────────────────────────── */
.cta {
  text-align: center;
  padding: clamp(60px, 10vw, 100px) clamp(16px, 4vw, 48px);
}

.cta-box {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 40px;
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--accent-soft) 100%);
  border: 1px solid rgba(52,199,89,0.15);
  border-radius: var(--radius-xl);
}

.cta .section-title {
  margin-bottom: 12px;
}

.cta-text {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}
.cta-text a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  background: var(--accent);
  color: #000;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 28px;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}
.cta-button:hover {
  background: var(--accent-hover);
  color: #000;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

/* ── Footer ─────────────────────────────────────────────── */
.footer {
  padding: 40px clamp(16px, 4vw, 48px);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-brand {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.footer-credit {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 4px;
}

.footer-license {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.footer-link:hover {
  color: var(--accent);
}

/* ── Scroll reveal animation ────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }
.reveal-delay-6 { transition-delay: 0.6s; }

/* ── Mobile responsive ──────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 998;
    pointer-events: none;
  }
  .mobile-menu.open {
    display: block;
    pointer-events: auto;
  }

  .mobile-menu-backdrop {
    position: absolute;
    inset: 0;
    background: transparent;
    opacity: 0;
    transition: opacity 0.25s ease;
  }
  .mobile-menu.open .mobile-menu-backdrop {
    opacity: 1;
  }

  .mobile-menu-panel {
    position: absolute;
    top: 8px;
    right: 16px;
    width: 220px;
    max-height: calc(100vh - var(--nav-height) - 24px);
    overflow-y: auto;
    background: var(--mobile-menu-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    box-shadow: var(--shadow-lg);
    transform: translateY(-10px);
    opacity: 0;
    transition: transform 0.25s ease, opacity 0.25s ease;
    pointer-events: auto;
  }
  .mobile-menu.open .mobile-menu-panel {
    transform: translateY(0);
    opacity: 1;
  }

  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    text-decoration: none;
    text-align: center;
  }
  .mobile-menu-btn:hover {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent);
  }
  .mobile-menu-btn--primary {
    background: transparent;
    border-color: var(--accent);
    color: var(--accent);
  }
  .mobile-menu-btn--primary:hover {
    background: var(--accent-soft);
  }
  .mobile-menu-btn--accent {
    background: var(--accent);
    color: #000;
    font-weight: 600;
  }
  .mobile-menu-btn--accent:hover {
    background: var(--accent-hover);
    color: #000;
  }

  .mobile-menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: 4px 0;
  }

  .nav-mobile-toggle {
    display: block;
  }

  .architecture .arch-grid {
    grid-template-columns: 1fr;
  }

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

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

  .hero-stats {
    gap: 24px;
  }

  .hero-badges {
    gap: 8px;
  }
}

@media (min-width: 769px) {
  .arch-flow {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
  }
  .arch-edge {
    padding-left: 0;
  }
  .arch-edge svg {
    transform: rotate(0deg);
  }
}

@media (max-width: 480px) {
  .hero {
    padding-top: calc(var(--nav-height) + 28px);
    padding-bottom: 48px;
  }
  .hero-title {
    font-size: clamp(32px, 10vw, 48px);
    line-height: 1.08;
  }
  .hero-subtitle {
    font-size: clamp(17px, 5.4vw, 24px);
  }
  .hero-tagline {
    margin-bottom: 24px;
    line-height: 1.55;
  }
  .hero-actions {
    gap: 10px;
    margin-top: 20px !important;
  }
  .hero-actions .cta-button {
    flex: 0 1 calc(50% - 6px);
    min-width: 0;
    padding-inline: 14px;
    justify-content: center;
  }
  .hero-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px 8px;
  }
  .hero-stat-value {
    font-size: clamp(16px, 5vw, 20px);
    white-space: nowrap;
  }
  .hero-stat-label {
    font-size: 12px;
    line-height: 1.35;
  }
  .hero-credits {
    gap: 20px;
    margin-top: 24px;
  }
  .hero-badge-item {
    font-size: 12px;
    padding: 6px 12px;
  }
  .cta-box {
    padding: 32px 20px;
  }
}

/* ── Utility: separator line between sections ───────────── */
.section-divider {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 48px);
}
.section-divider::after {
  content: '';
  display: block;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--border-color) 50%, transparent 100%);
}

/* ── Reduced motion ─────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .reveal { transition: none; }
  html { scroll-behavior: auto; }
}

/* ═══ Navigation: 注册按钮 + 文档入口 ═══════════════════════ */
/* 注册按钮:次要 outline 风格,与 .nav-cta(实心)搭配 */
.nav-register {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: transparent;
  color: var(--text-primary) !important;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: all var(--transition-fast);
}
.nav-register:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
  background: var(--accent-soft);
}
/* 文档入口:普通链接样式(与架构/功能/安全锚点一致) */
.nav-doc {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 400;
  cursor: pointer;
  transition: color var(--transition-fast);
}
.nav-doc:hover { color: var(--text-primary); }