/* ==========================================================================
   COCODUCK VPN - Nordic Cold-Spring Minimalist Luxury Design System
   Palette:
     - Stark Glacial White (#fafafa)
     - Mineral Hot-Spring Grey (#4a4d52 / #181a1d)
     - Solitary Signature Accent: Sculptural Matte Canary Yellow (#fcd34d)
   Zero AI robots. Pure museum-grade negative space, borderless floating cards,
   subtle diffuse shadows, and reflective thermal water aesthetic.
   ========================================================================== */

:root {
  /* Nordic Cold-Spring Palette (Light Mode - Default) */
  --bg-glacial: #fafafa;
  --bg-surface: #ffffff;
  --bg-surface-subtle: #f3f4f6;
  --bg-glass: rgba(250, 250, 250, 0.85);
  
  --text-mineral-dark: #181a1d;
  --text-mineral-grey: #4a4d52;
  --text-mineral-light: #71767f;
  
  /* Solitary Signature Matte Canary Yellow Accent */
  --accent-canary: #fcd34d;
  --accent-canary-deep: #eab308;
  --accent-canary-dark: #b45309;
  --accent-canary-soft: rgba(252, 211, 77, 0.18);
  --accent-canary-glow: rgba(252, 211, 77, 0.35);
  
  /* Mineral Accents & Borders */
  --border-hairline: rgba(74, 77, 82, 0.08);
  --border-focus: rgba(234, 179, 8, 0.4);
  
  /* Museum-Grade Cast Shadows (Soft, wide-angle diffusion) */
  --shadow-museum-sm: 0 4px 20px -2px rgba(24, 26, 29, 0.03), 0 2px 6px -1px rgba(24, 26, 29, 0.02);
  --shadow-museum-md: 0 16px 36px -8px rgba(24, 26, 29, 0.05), 0 4px 12px -2px rgba(24, 26, 29, 0.02);
  --shadow-museum-lg: 0 28px 60px -15px rgba(24, 26, 29, 0.07), 0 10px 20px -4px rgba(24, 26, 29, 0.03);
  --shadow-museum-hover: 0 35px 75px -15px rgba(24, 26, 29, 0.1), 0 12px 24px -4px rgba(24, 26, 29, 0.04);
  
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;
  
  --nav-height: 80px;
  --container-max: 1240px;
  --transition-zen: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Mode - Nordic Deep Basalt & Midnight Mineral Spa */
[data-theme="dark"] {
  --bg-glacial: #0c0e12;
  --bg-surface: #14171d;
  --bg-surface-subtle: #1b1f27;
  --bg-glass: rgba(12, 14, 18, 0.88);
  
  --text-mineral-dark: #f9fafb;
  --text-mineral-grey: #a0a6b1;
  --text-mineral-light: #6b7280;
  
  --accent-canary: #fcd34d;
  --accent-canary-deep: #fbbf24;
  --accent-canary-dark: #f59e0b;
  --accent-canary-soft: rgba(252, 211, 77, 0.12);
  --accent-canary-glow: rgba(252, 211, 77, 0.28);
  
  --border-hairline: rgba(255, 255, 255, 0.06);
  --border-focus: rgba(252, 211, 77, 0.35);
  
  --shadow-museum-sm: 0 4px 20px -2px rgba(0, 0, 0, 0.4);
  --shadow-museum-md: 0 16px 36px -8px rgba(0, 0, 0, 0.6);
  --shadow-museum-lg: 0 28px 60px -15px rgba(0, 0, 0, 0.7);
  --shadow-museum-hover: 0 35px 80px -15px rgba(0, 0, 0, 0.85);
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 20px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--bg-glacial);
  color: var(--text-mineral-dark);
  transition: background-color var(--transition-zen), color var(--transition-zen);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-glacial);
  color: var(--text-mineral-dark);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 32px;
  padding-right: 32px;
}

/* --------------------------------------------------------------------------
   Header & Museum Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-hairline);
  transition: background var(--transition-zen), border-color var(--transition-zen);
}

.header-inner {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* Brand Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-mineral-dark);
}

.brand-logo-img {
  height: 38px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: transform var(--transition-fast);
}

.brand-logo:hover .brand-logo-img {
  transform: translateY(-1px);
}

:root:not([data-theme="dark"]) .logo-dark {
  display: none !important;
}
:root:not([data-theme="dark"]) .logo-light {
  display: block !important;
}
[data-theme="dark"] .logo-light {
  display: none !important;
}
[data-theme="dark"] .logo-dark {
  display: block !important;
}

.brand-text-accent {
  color: var(--accent-canary-deep);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.05em;
  padding: 2px 7px;
  background: var(--accent-canary-soft);
  border-radius: var(--radius-xs);
  margin-left: 2px;
}

/* Nav Menu */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-mineral-grey);
  padding: 6px 0;
  position: relative;
  letter-spacing: -0.01em;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background-color: var(--accent-canary);
  border-radius: var(--radius-full);
  transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Highlight badge for "推荐资讯" */
.nav-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-pill-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-canary-deep);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 6px var(--accent-canary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Sculptural Glass Day/Night Switch Button */
.theme-toggle-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(74, 77, 82, 0.05);
  border: 1px solid var(--border-hairline);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text-mineral-dark);
  transition: all var(--transition-zen);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  background: rgba(74, 77, 82, 0.1);
  border-color: var(--accent-canary-deep);
  transform: scale(1.04);
}

.theme-icon-sun,
.theme-icon-moon {
  width: 20px;
  height: 20px;
  stroke-width: 1.8;
  transition: transform var(--transition-zen), opacity var(--transition-zen);
}

:root:not([data-theme="dark"]) .theme-icon-sun {
  display: block;
}
:root:not([data-theme="dark"]) .theme-icon-moon {
  display: none;
}
[data-theme="dark"] .theme-icon-sun {
  display: none;
}
[data-theme="dark"] .theme-icon-moon {
  display: block;
  color: var(--accent-canary);
}

/* Luxury Sculptural Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 24px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  letter-spacing: -0.01em;
  transition: all var(--transition-zen);
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background-color: var(--text-mineral-dark);
  color: var(--bg-glacial);
  box-shadow: 0 8px 24px -4px rgba(24, 26, 29, 0.18);
  border: 1px solid transparent;
}

.btn-primary:hover {
  background-color: #000000;
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -6px rgba(24, 26, 29, 0.28);
  color: var(--accent-canary);
}

[data-theme="dark"] .btn-primary {
  background-color: var(--accent-canary);
  color: #181a1d;
  box-shadow: 0 8px 24px -4px rgba(252, 211, 77, 0.3);
}

[data-theme="dark"] .btn-primary:hover {
  background-color: #fde047;
  color: #000000;
  box-shadow: 0 14px 32px -4px rgba(252, 211, 77, 0.45);
}

.btn-accent {
  background-color: var(--accent-canary);
  color: #181a1d;
  font-weight: 700;
  box-shadow: 0 10px 28px -5px var(--accent-canary-glow);
  border: 1px solid rgba(252, 211, 77, 0.4);
}

.btn-accent:hover {
  background-color: #fbbf24;
  transform: translateY(-2px);
  box-shadow: 0 16px 36px -6px var(--accent-canary-glow);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-mineral-dark);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-museum-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-subtle);
  border-color: rgba(74, 77, 82, 0.2);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.02rem;
  font-weight: 600;
}

.btn-block {
  width: 100%;
}

.mobile-nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline);
  color: var(--text-mineral-dark);
  background: var(--bg-surface);
}

/* --------------------------------------------------------------------------
   Museum Hero Section: Cold Spring & Abstract Duck Sculpture
   -------------------------------------------------------------------------- */
.hero-museum-section {
  position: relative;
  padding: 70px 0 90px;
  overflow: hidden;
}

.hero-ambient-glow {
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 600px;
  background: radial-gradient(circle, rgba(252, 211, 77, 0.09) 0%, rgba(74, 77, 82, 0.04) 45%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  filter: blur(60px);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 50px;
  position: relative;
  z-index: 2;
}

.hero-text-block {
  text-align: left;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: var(--accent-canary-soft);
  border: 1px solid rgba(252, 211, 77, 0.35);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-mineral-dark);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero-pill-indicator {
  width: 7px;
  height: 7px;
  background: var(--accent-canary-deep);
  border-radius: 50%;
  animation: zenPulse 2.4s infinite;
}

@keyframes zenPulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
  color: var(--text-mineral-dark);
}

.hero-brand-highlight {
  position: relative;
  display: inline-block;
  color: var(--text-mineral-dark);
}

.hero-brand-highlight::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 8px;
  width: 100%;
  height: 12px;
  background: var(--accent-canary);
  opacity: 0.45;
  z-index: -1;
  border-radius: 2px;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-mineral-grey);
  line-height: 1.5;
  margin-bottom: 16px;
}

.hero-intro-desc {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-mineral-light);
  margin-bottom: 36px;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-trust-row {
  display: flex;
  align-items: center;
  gap: 24px;
  border-top: 1px solid var(--border-hairline);
  padding-top: 24px;
}

.trust-item {
  display: flex;
  flex-direction: column;
}

.trust-item strong {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-mineral-dark);
  letter-spacing: -0.02em;
}

.trust-item span {
  font-size: 0.8rem;
  color: var(--text-mineral-light);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   3D Abstract Geometric Duck Sculpture & Reflective Thermal Mirror
   -------------------------------------------------------------------------- */
.sculpture-container {
  position: relative;
  width: 100%;
  max-width: 580px;
  height: 480px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  user-select: none;
  perspective: 1200px;
  margin: 0 auto;
}

.sculpture-art-wrap {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 540px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 25px 60px -15px rgba(24, 26, 29, 0.12), 0 0 0 1px var(--border-hairline);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
  transform-style: preserve-3d;
  background: var(--bg-surface);
}

.sculpture-art-wrap:hover {
  box-shadow: 0 35px 80px -15px rgba(24, 26, 29, 0.2), 0 0 0 1px rgba(252, 211, 77, 0.4);
}

.sculpture-art-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: var(--radius-xl);
  pointer-events: none;
}

/* Thermal water plane mirror */
.thermal-water-plane {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  width: 95%;
  height: 120px;
  background: radial-gradient(ellipse at center, rgba(252, 211, 77, 0.12) 0%, rgba(74, 77, 82, 0.04) 50%, transparent 75%);
  border-radius: 50%;
  filter: blur(16px);
  pointer-events: none;
  z-index: 1;
}

/* Water Ripples Animation */
.water-ripple-ring {
  position: absolute;
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%) rotateX(75deg);
  border-radius: 50%;
  border: 1px solid rgba(252, 211, 77, 0.35);
  animation: rippleSpread 5s infinite cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
  z-index: 3;
}

.water-ripple-ring:nth-child(2) {
  animation-delay: 1.6s;
}

.water-ripple-ring:nth-child(3) {
  animation-delay: 3.2s;
}

@keyframes rippleSpread {
  0% {
    width: 60px;
    height: 30px;
    opacity: 0.8;
  }
  100% {
    width: 440px;
    height: 220px;
    opacity: 0;
  }
}

.sculpture-tag-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 8px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-museum-md);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-mineral-dark);
  z-index: 5;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.sculpture-tag-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
}

/* --------------------------------------------------------------------------
   Museum Section Structure (Clean Negative Space, Distraction-Free)
   -------------------------------------------------------------------------- */
.section {
  padding: 100px 0;
  position: relative;
}

.section-subtle {
  background-color: var(--bg-surface-subtle);
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px;
}

.section-kicker {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-canary-dark);
  margin-bottom: 12px;
}

[data-theme="dark"] .section-kicker {
  color: var(--accent-canary);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
  color: var(--text-mineral-dark);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-mineral-grey);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   Core Advantages (3 Borderless Museum Floating Cards)
   -------------------------------------------------------------------------- */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.advantage-card {
  background: var(--bg-surface);
  /* Borderless floating card with soft museum shadow */
  border: none;
  border-radius: var(--radius-lg);
  padding: 44px 34px;
  box-shadow: var(--shadow-museum-md);
  transition: transform var(--transition-zen), box-shadow var(--transition-zen);
  display: flex;
  flex-direction: column;
  position: relative;
}

.advantage-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-museum-hover);
}

.advantage-icon-box {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-subtle);
  color: var(--text-mineral-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 28px;
  transition: all var(--transition-zen);
}

.advantage-card:hover .advantage-icon-box {
  background: var(--accent-canary);
  color: #181a1d;
  transform: scale(1.05);
}

.advantage-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-mineral-dark);
  letter-spacing: -0.015em;
}

.advantage-body {
  font-size: 0.95rem;
  color: var(--text-mineral-grey);
  line-height: 1.75;
  margin-bottom: 24px;
  flex-grow: 1;
}

.advantage-checklist {
  border-top: 1px solid var(--border-hairline);
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.advantage-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-mineral-grey);
}

.advantage-item svg {
  color: var(--accent-canary-deep);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Streaming Cards (Borderless Museum Grid)
   -------------------------------------------------------------------------- */
.stream-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stream-card {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  box-shadow: var(--shadow-museum-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: transform var(--transition-zen), box-shadow var(--transition-zen);
}

.stream-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-museum-lg);
}

.stream-icon-wrap {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  background: var(--bg-surface-subtle);
  color: var(--text-mineral-dark);
  transition: transform var(--transition-fast);
}

.stream-card:hover .stream-icon-wrap {
  transform: scale(1.08);
}

.stream-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-mineral-dark);
  margin-bottom: 6px;
}

.stream-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: var(--accent-canary-soft);
  color: var(--text-mineral-dark);
  margin-bottom: 12px;
}

.stream-desc {
  font-size: 0.85rem;
  color: var(--text-mineral-light);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   AI Support Cards (Zen Museum Grid)
   -------------------------------------------------------------------------- */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.ai-card {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  box-shadow: var(--shadow-museum-sm);
  display: flex;
  gap: 18px;
  transition: transform var(--transition-zen), box-shadow var(--transition-zen);
}

.ai-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-museum-lg);
}

.ai-icon-square {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-subtle);
  color: var(--text-mineral-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition-fast);
}

.ai-card:hover .ai-icon-square {
  background: var(--accent-canary);
  color: #181a1d;
}

.ai-content {
  flex-grow: 1;
}

.ai-title-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.ai-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-mineral-dark);
}

.ai-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  background: var(--bg-surface-subtle);
  color: var(--text-mineral-dark);
}

.ai-desc {
  font-size: 0.88rem;
  color: var(--text-mineral-grey);
  line-height: 1.65;
  margin-bottom: 12px;
}

.ai-perk {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-canary-dark);
  display: flex;
  align-items: center;
  gap: 5px;
}

[data-theme="dark"] .ai-perk {
  color: var(--accent-canary);
}

/* --------------------------------------------------------------------------
   Realistic Pricing Comparison Table (网上真实专线套餐标杆)
   -------------------------------------------------------------------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  padding: 44px 34px;
  box-shadow: var(--shadow-museum-md);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-zen), box-shadow var(--transition-zen);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-museum-hover);
}

/* Featured Luxury Plan */
.pricing-card-featured {
  box-shadow: 0 24px 60px -10px rgba(24, 26, 29, 0.12), 0 0 0 2px var(--accent-canary);
  transform: scale(1.02);
  z-index: 2;
}

.pricing-card-featured:hover {
  transform: scale(1.02) translateY(-8px);
  box-shadow: 0 35px 80px -12px rgba(24, 26, 29, 0.18), 0 0 0 2px var(--accent-canary);
}

[data-theme="dark"] .pricing-card-featured {
  box-shadow: 0 24px 60px -10px rgba(0, 0, 0, 0.7), 0 0 0 2px var(--accent-canary);
}

.pricing-crown-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-canary);
  color: #181a1d;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 5px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px var(--accent-canary-glow);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.pricing-plan-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-mineral-dark);
  margin-bottom: 8px;
}

.pricing-plan-sub {
  font-size: 0.9rem;
  color: var(--text-mineral-light);
  line-height: 1.5;
  margin-bottom: 24px;
}

.pricing-cost-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 30px;
}

.price-currency-sym {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-mineral-dark);
}

.price-amount {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text-mineral-dark);
  letter-spacing: -0.04em;
}

.price-period-tag {
  font-size: 0.92rem;
  color: var(--text-mineral-light);
  font-weight: 500;
  margin-left: 4px;
}

.pricing-checklist {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 36px;
  flex-grow: 1;
}

.pricing-check-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.93rem;
  color: var(--text-mineral-grey);
}

.pricing-check-item svg {
  width: 18px;
  height: 18px;
  color: var(--accent-canary-dark);
  flex-shrink: 0;
  margin-top: 3px;
}

[data-theme="dark"] .pricing-check-item svg {
  color: var(--accent-canary);
}

.pricing-check-item strong {
  color: var(--text-mineral-dark);
}

.pricing-check-item.disabled {
  opacity: 0.45;
}

.pricing-check-item.disabled svg {
  color: var(--text-mineral-light);
}

/* --------------------------------------------------------------------------
   User Reviews (Museum Testimonials)
   -------------------------------------------------------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  box-shadow: var(--shadow-museum-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-zen), box-shadow var(--transition-zen);
}

.review-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-museum-md);
}

.review-stars {
  display: flex;
  gap: 3px;
  color: var(--accent-canary-deep);
  font-size: 1.1rem;
  margin-bottom: 18px;
}

.review-text {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--text-mineral-grey);
  margin-bottom: 26px;
  font-style: italic;
}

.review-profile {
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--border-hairline);
  padding-top: 18px;
}

.author-glyph {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-surface-subtle);
  color: var(--text-mineral-dark);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
}

.author-meta h3,
.author-meta h5 {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-mineral-dark);
}

.author-meta p {
  font-size: 0.82rem;
  color: var(--text-mineral-light);
}

/* --------------------------------------------------------------------------
   FAQ Section (Accordion)
   -------------------------------------------------------------------------- */
.faq-box {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-card {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-museum-sm);
  transition: box-shadow var(--transition-fast);
}

.faq-card[open] {
  box-shadow: var(--shadow-museum-md);
}

.faq-head {
  padding: 22px 28px;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-mineral-dark);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

.faq-head::-webkit-details-marker {
  display: none;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--text-mineral-light);
  transition: transform var(--transition-zen);
}

.faq-card[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-canary-dark);
}

.faq-body {
  padding: 0 28px 24px;
  font-size: 0.98rem;
  color: var(--text-mineral-grey);
  line-height: 1.8;
  border-top: 1px solid var(--border-hairline);
  padding-top: 18px;
}

/* --------------------------------------------------------------------------
   Bottom Museum CTA
   -------------------------------------------------------------------------- */
.bottom-cta-banner {
  background: var(--text-mineral-dark);
  color: #fafafa;
  border-radius: var(--radius-xl);
  padding: 70px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 25px 60px -15px rgba(24, 26, 29, 0.35);
}

[data-theme="dark"] .bottom-cta-banner {
  background: #14171d;
  border: 1px solid var(--border-hairline);
}

.bottom-cta-title {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: -0.025em;
  color: #ffffff;
}

.bottom-cta-desc {
  font-size: 1.12rem;
  color: #d1d5db;
  max-width: 650px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   Footer (Strictly 4 links only, target="_blank")
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-hairline);
  padding: 54px 0 38px;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-mineral-grey);
  transition: color var(--transition-fast);
  padding: 8px 14px;
  border-radius: var(--radius-xs);
}

.footer-link:hover {
  color: var(--text-mineral-dark);
  background: var(--bg-surface-subtle);
}

.footer-copyright {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-mineral-light);
  border-top: 1px solid var(--border-hairline);
  width: 100%;
  padding-top: 26px;
}

/* --------------------------------------------------------------------------
   Subpages & Article Layout (insights, about, terms, privacy, sitemap)
   -------------------------------------------------------------------------- */
.subpage-hero {
  padding: 70px 0 45px;
  text-align: center;
  border-bottom: 1px solid var(--border-hairline);
  background: var(--bg-surface);
}

.subpage-title {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
  color: var(--text-mineral-dark);
}

.subpage-meta {
  font-size: 0.95rem;
  color: var(--text-mineral-light);
}

.subpage-body {
  padding: 60px 0 90px;
}

.legal-document {
  max-width: 880px;
  margin: 0 auto;
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  padding: 50px 44px;
  box-shadow: var(--shadow-museum-md);
}

.legal-section {
  margin-bottom: 40px;
}

.legal-section:last-child {
  margin-bottom: 0;
}

.legal-h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-mineral-dark);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 10px;
}

.legal-p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-mineral-grey);
  margin-bottom: 16px;
}

.legal-list {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 18px;
}

.legal-list li {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--text-mineral-grey);
  margin-bottom: 8px;
}

.highlight-box {
  background: var(--accent-canary-soft);
  border-left: 4px solid var(--accent-canary-deep);
  padding: 20px 24px;
  border-radius: var(--radius-xs);
  margin: 22px 0;
}

.highlight-box p {
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--text-mineral-dark);
  font-weight: 500;
}

.back-home-bar {
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: var(--text-mineral-dark);
  font-size: 0.95rem;
}

.back-link:hover {
  color: var(--accent-canary-dark);
}

/* Articles in Insights Page */
.article-card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  box-shadow: var(--shadow-museum-sm);
  margin-bottom: 28px;
  transition: transform var(--transition-zen), box-shadow var(--transition-zen);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-museum-md);
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.article-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--accent-canary-soft);
  color: var(--text-mineral-dark);
}

.article-date {
  font-size: 0.85rem;
  color: var(--text-mineral-light);
}

.article-heading {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-mineral-dark);
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-summary {
  font-size: 0.96rem;
  color: var(--text-mineral-grey);
  line-height: 1.75;
}

/* --------------------------------------------------------------------------
   Responsive Media Queries (@media)
   Optimized for seamless single column and touch friendliness
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .hero-text-block {
    text-align: center;
  }
  
  .hero-intro-desc {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-cta-group {
    justify-content: center;
  }
  
  .hero-trust-row {
    justify-content: center;
  }
  
  .advantages-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stream-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .ai-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-card-featured {
    transform: none;
  }
  
  .pricing-card-featured:hover {
    transform: translateY(-8px);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 70px;
  }
  
  .container {
    padding-left: 20px;
    padding-right: 20px;
  }
  
  .hero-title {
    font-size: 2.3rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .sculpture-container {
    height: 380px;
  }
  
  .sculpture-svg {
    width: 230px;
    height: 185px;
  }
  
  .section {
    padding: 65px 0;
  }
  
  .section-title {
    font-size: 1.9rem;
  }
  
  /* Mobile Single Column Strict */
  .advantages-grid,
  .stream-grid,
  .ai-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  
  /* Mobile Navigation Drawer */
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-hairline);
    flex-direction: column;
    padding: 26px 20px;
    gap: 18px;
    transform: translateY(-130%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-zen);
    box-shadow: var(--shadow-museum-lg);
    z-index: 199;
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  
  .mobile-nav-toggle {
    display: inline-flex;
  }
  
  .btn {
    min-height: 48px; /* Touch target */
  }
  
  .hero-cta-group .btn {
    width: 100%;
  }
  
  .hero-trust-row {
    flex-direction: column;
    gap: 16px;
    align-items: center;
  }
  
  .bottom-cta-banner {
    padding: 44px 24px;
  }
  
  .bottom-cta-title {
    font-size: 1.9rem;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }
  
  .legal-document {
    padding: 30px 20px;
  }
}

/* --------------------------------------------------------------------------
   Long-Form SEO Article Layout & Typography
   -------------------------------------------------------------------------- */
.article-wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 0 90px;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-mineral-light);
  margin-bottom: 24px;
}

.article-breadcrumb a {
  color: var(--text-mineral-grey);
}

.article-breadcrumb a:hover {
  color: var(--accent-canary-dark);
}

.article-post-header {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-hairline);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.88rem;
  color: var(--text-mineral-light);
  margin-bottom: 16px;
}

.article-tag {
  display: inline-block;
  padding: 3px 12px;
  background: var(--accent-canary-soft);
  color: var(--text-mineral-dark);
  font-weight: 700;
  font-size: 0.78rem;
  border-radius: var(--radius-full);
}

.article-post-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--text-mineral-dark);
  margin-bottom: 18px;
}

.article-lead {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-mineral-grey);
  background: var(--bg-surface-subtle);
  border-left: 4px solid var(--accent-canary-deep);
  padding: 20px 24px;
  border-radius: var(--radius-xs);
  margin-bottom: 30px;
}

/* Table of Contents */
.article-toc {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-museum-sm);
}

.article-toc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-mineral-dark);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-toc-list li {
  font-size: 0.95rem;
  line-height: 1.5;
}

.article-toc-list a {
  color: var(--text-mineral-grey);
  display: inline-block;
  padding: 4px 0;
}

.article-toc-list a:hover {
  color: var(--accent-canary-dark);
  transform: translateX(4px);
}

/* Article Body Typography */
.article-body {
  font-size: 1.02rem;
  line-height: 1.88;
  color: var(--text-mineral-dark);
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-mineral-dark);
  margin: 48px 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-hairline);
  letter-spacing: -0.015em;
}

.article-body h3 {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--text-mineral-dark);
  margin: 32px 0 16px;
}

.article-body p {
  margin-bottom: 22px;
  color: var(--text-mineral-grey);
}

.article-body strong {
  color: var(--text-mineral-dark);
}

.article-body ul, .article-body ol {
  margin: 0 0 26px 24px;
}

.article-body li {
  margin-bottom: 10px;
  color: var(--text-mineral-grey);
  line-height: 1.8;
}

/* Responsive Table in Article */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0 34px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-museum-sm);
  background: var(--bg-surface);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
}

.comparison-table th {
  background: var(--bg-surface-subtle);
  color: var(--text-mineral-dark);
  padding: 14px 18px;
  font-weight: 700;
  border-bottom: 2px solid var(--border-hairline);
}

.comparison-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-hairline);
  color: var(--text-mineral-grey);
}

.comparison-table tr:hover td {
  background: rgba(252, 211, 77, 0.05);
}

/* In-Article Conversion Banner */
.article-cta-box {
  background: linear-gradient(135deg, var(--text-mineral-dark) 0%, #232731 100%);
  color: #ffffff;
  padding: 40px 32px;
  border-radius: var(--radius-lg);
  margin: 50px 0;
  text-align: center;
  box-shadow: var(--shadow-museum-md);
}

.article-cta-title {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffffff;
}

.article-cta-desc {
  font-size: 1rem;
  color: #d1d5db;
  max-width: 600px;
  margin: 0 auto 24px;
}

/* Article FAQ Section */
.article-faq-section {
  margin: 54px 0;
  padding-top: 36px;
  border-top: 1px solid var(--border-hairline);
}

.article-faq-title {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-mineral-dark);
  margin-bottom: 24px;
}

/* Related Articles Grid */
.article-related-section {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 2px solid var(--border-hairline);
}

.article-related-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-mineral-dark);
  margin-bottom: 24px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-museum-md);
  border-color: var(--accent-canary-deep);
}

.related-card-tag {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-canary-dark);
  margin-bottom: 6px;
}

.related-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-mineral-dark);
  line-height: 1.45;
  margin-bottom: 8px;
}

.related-card-desc {
  font-size: 0.86rem;
  color: var(--text-mineral-light);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .article-post-title {
    font-size: 1.75rem;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .article-wrapper {
    padding: 20px 0 60px;
  }
}