/* ===================================================================
   YKKCLOUD - Stratospheric Auroral Vapor Luxury UI Design
   Color Palette:
   - Twilight Mesosphere Indigo: #090d1f / #0d1430
   - Luminous Polar Aurora Cyan: #22d3ee / #06b6d4
   - Cloud-Mist Ice White: #f1f5f9 / #ffffff
   - Titanium HUD Wireframes: rgba(34, 211, 238, 0.2) / rgba(255, 255, 255, 0.1)
   =================================================================== */

:root {
  /* Day / Light Mode */
  --bg-body: #f3f6fc;
  --bg-surface: #ffffff;
  --bg-surface-alt: #eef3fb;
  --bg-glass: rgba(255, 255, 255, 0.82);
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-card-hover: #ffffff;
  --border-color: #dbe4f0;
  --border-hud: rgba(6, 182, 212, 0.28);

  --text-primary: #090d1f;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;

  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: rgba(2, 132, 199, 0.08);
  --primary-gradient: linear-gradient(135deg, #0284c7 0%, #22d3ee 50%, #4f46e5 100%);
  --aurora-cyan: #06b6d4;
  --aurora-bright: #22d3ee;
  --aurora-purple: #818cf8;
  --accent-green: #10b981;

  --hero-glow: radial-gradient(circle at 50% 15%, rgba(34, 211, 238, 0.12) 0%, rgba(79, 70, 229, 0.05) 50%, transparent 80%);
  --cloud-gradient: linear-gradient(180deg, rgba(243, 246, 252, 0.2) 0%, rgba(226, 238, 255, 0.6) 100%);

  --shadow-sm: 0 2px 6px rgba(9, 13, 31, 0.04);
  --shadow-md: 0 8px 20px -4px rgba(9, 13, 31, 0.07);
  --shadow-lg: 0 16px 36px -6px rgba(9, 13, 31, 0.1);
  --shadow-hover: 0 24px 48px -8px rgba(6, 182, 212, 0.22);
  --aurora-glow: 0 0 35px rgba(34, 211, 238, 0.28);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font-mono: ui-monospace, SFMono-Regular, "Roboto Mono", Menlo, Consolas, monospace;
  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.32s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-theme: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

/* Dark Mode (Twilight Mesosphere Indigo & Polar Aurora Cyan) */
[data-theme="dark"] {
  --bg-body: #060913;
  --bg-surface: #090d1f;
  --bg-surface-alt: #0e152d;
  --bg-glass: rgba(9, 13, 31, 0.85);
  --bg-card: rgba(14, 21, 45, 0.75);
  --bg-card-hover: rgba(19, 29, 61, 0.9);
  --border-color: rgba(34, 211, 238, 0.18);
  --border-hud: rgba(34, 211, 238, 0.4);

  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --primary: #22d3ee;
  --primary-hover: #38bdf8;
  --primary-light: rgba(34, 211, 238, 0.12);
  --primary-gradient: linear-gradient(135deg, #22d3ee 0%, #38bdf8 45%, #818cf8 100%);
  --aurora-cyan: #22d3ee;
  --aurora-bright: #67e8f9;

  --hero-glow: radial-gradient(circle at 50% 15%, rgba(34, 211, 238, 0.22) 0%, rgba(99, 102, 241, 0.12) 45%, transparent 75%);
  --cloud-gradient: linear-gradient(180deg, rgba(9, 13, 31, 0.2) 0%, rgba(6, 9, 19, 0.9) 100%);

  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 8px 20px -4px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 16px 36px -6px rgba(0, 0, 0, 0.7);
  --shadow-hover: 0 24px 48px -8px rgba(34, 211, 238, 0.35);
  --aurora-glow: 0 0 45px rgba(34, 211, 238, 0.38);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.65;
  transition: var(--transition-theme);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Vapor Aerodynamic Canvas Background */
#vaporCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 1;
  opacity: 0.65;
  transition: opacity 0.5s ease;
}

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

img, svg {
  vertical-align: middle;
}

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

/* Layout Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 2;
}

.section {
  padding: 100px 0;
  position: relative;
  z-index: 2;
}

.section-alt {
  background-color: var(--bg-surface-alt);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 60px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--primary-light);
  color: var(--aurora-cyan);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  letter-spacing: 1.2px;
  margin-bottom: 16px;
  border: 1px solid var(--border-hud);
  box-shadow: 0 0 16px rgba(34, 211, 238, 0.15);
  text-transform: uppercase;
}

.section-tag::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--aurora-cyan);
  box-shadow: 0 0 8px var(--aurora-cyan);
}

.section-title {
  font-size: 2.45rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -0.025em;
  margin-bottom: 18px;
}

.section-desc {
  font-size: 1.12rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================================================
   Header & Navigation
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-theme);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-img {
  height: 42px;
  width: auto;
  border-radius: 8px;
  display: block;
  object-fit: contain;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.brand-logo:hover .brand-logo-img {
  transform: translateY(-1px) scale(1.03);
  box-shadow: 0 6px 20px rgba(34, 211, 238, 0.35);
}

/* Nav Menu with All Section Anchors + Recommended News */
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 4px;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: all var(--transition-fast);
  transform: translateX(-50%);
  border-radius: 2px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--aurora-cyan);
}

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

/* Badge on "推荐资讯" entry */
.nav-link-badge {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-pill-new {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  background: linear-gradient(135deg, #06b6d4, #818cf8);
  color: #ffffff;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Day / Night Mode Switch Button (Luxury Translucent Glass) */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
  position: relative;
}

.theme-toggle-btn:hover {
  color: var(--aurora-cyan);
  border-color: var(--aurora-cyan);
  transform: translateY(-1px);
  box-shadow: 0 0 20px rgba(34, 211, 238, 0.35);
}

.theme-toggle-btn .icon-sun,
.theme-toggle-btn .icon-moon {
  transition: transform 0.3s ease, opacity 0.3s ease;
  position: absolute;
}

[data-theme="light"] .theme-toggle-btn .icon-sun,
:root:not([data-theme="dark"]) .theme-toggle-btn .icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="light"] .theme-toggle-btn .icon-moon,
:root:not([data-theme="dark"]) .theme-toggle-btn .icon-moon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

[data-theme="dark"] .theme-toggle-btn .icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
  color: #facc15;
}

[data-theme="dark"] .theme-toggle-btn .icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

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

/* Call to Action Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #060913 !important;
  font-weight: 800;
  box-shadow: 0 4px 18px rgba(34, 211, 238, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

[data-theme="light"] .btn-primary {
  color: #ffffff !important;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(34, 211, 238, 0.55);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary) !important;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--aurora-cyan);
  color: var(--aurora-cyan) !important;
  background: var(--bg-surface-alt);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.08rem;
  letter-spacing: 0.3px;
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   Hero Section: Stratospheric Auroral Vapor Cloudscape & HUD
   =================================================================== */
.hero-section {
  position: relative;
  padding: 110px 0 100px 0;
  background: var(--hero-glow);
  text-align: center;
  overflow: hidden;
}

/* Titanium HUD Coordinate Frames */
.hud-frame-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 28px;
  position: relative;
}

.hud-pill {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-hud);
  box-shadow: 0 0 20px rgba(34, 211, 238, 0.15);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hud-coord {
  color: var(--aurora-cyan);
  font-weight: 700;
}

.hud-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--aurora-cyan);
  box-shadow: 0 0 12px var(--aurora-cyan);
  animation: hud-pulse 2s infinite ease-in-out;
}

@keyframes hud-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(0.75); opacity: 0.4; }
}

/* Hero Headline & Title Containing Brand Name */
.hero-headline {
  font-size: 3.8rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.035em;
  color: var(--text-primary);
  max-width: 1050px;
  margin: 0 auto 28px auto;
  position: relative;
}

.hero-headline .brand-highlight {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  text-shadow: 0 0 35px rgba(34, 211, 238, 0.25);
}

.hero-headline-sub {
  display: block;
  font-size: 2.8rem;
  font-weight: 800;
  margin-top: 10px;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.hero-intro {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto 44px auto;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

.hero-telemetry-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border-hud);
  padding-top: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.telemetry-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.telemetry-item strong {
  color: var(--aurora-cyan);
}

/* ===================================================================
   3D Aerodynamic Horizon Tilt Cards (Features)
   =================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  perspective: 1200px;
}

.tilt-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-md);
  transition: transform 0.15s ease-out, border-color var(--transition-normal), box-shadow var(--transition-normal);
  transform-style: preserve-3d;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.tilt-card::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 2px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.6), transparent 60%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.tilt-card:hover {
  border-color: rgba(34, 211, 238, 0.45);
  box-shadow: var(--shadow-hover);
}

.tilt-card:hover::after {
  opacity: 1;
}

.feature-telemetry-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--aurora-cyan);
  background: var(--primary-light);
  border: 1px solid var(--border-hud);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
  width: fit-content;
}

.feature-icon-box {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--aurora-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  border: 1px solid var(--border-hud);
  box-shadow: 0 0 20px rgba(34, 211, 238, 0.15);
}

.feature-card-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.feature-card-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.feature-list-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.feature-list-item svg {
  color: var(--aurora-cyan);
  flex-shrink: 0;
}

/* ===================================================================
   Streaming & AI Dual Showcase Section
   =================================================================== */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 44px 38px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.showcase-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(34, 211, 238, 0.45);
}

.showcase-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 20px;
  width: fit-content;
  font-family: var(--font-mono);
}

.badge-media {
  background: rgba(239, 68, 68, 0.12);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-ai {
  background: rgba(34, 211, 238, 0.12);
  color: var(--aurora-cyan);
  border: 1px solid var(--border-hud);
}

.showcase-title {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.showcase-desc {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 28px;
}

.services-tag-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 30px;
}

.service-tag-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-surface-alt);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

.service-tag-icon {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: var(--bg-surface);
  flex-shrink: 0;
}

.showcase-footer {
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

.showcase-stat {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.showcase-stat strong {
  color: var(--aurora-cyan);
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 42px 34px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

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

.pricing-card.featured {
  border: 2px solid var(--aurora-cyan);
  box-shadow: 0 16px 36px rgba(34, 211, 238, 0.22);
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: #060913;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 5px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(34, 211, 238, 0.4);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  white-space: nowrap;
}

[data-theme="light"] .pricing-ribbon {
  color: #ffffff;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 44px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 12px;
}

.currency {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
}

.amount {
  font-size: 3.2rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
  letter-spacing: -0.03em;
}

.period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.plan-billing-cycle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--aurora-cyan);
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 36px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.93rem;
  color: var(--text-secondary);
}

.plan-feature-item svg {
  color: var(--aurora-cyan);
  flex-shrink: 0;
  margin-top: 3px;
}

.plan-feature-item.disabled {
  color: var(--text-dim);
  text-decoration: line-through;
}

.plan-feature-item.disabled svg {
  color: var(--text-dim);
}

/* ===================================================================
   User Reviews
   =================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(34, 211, 238, 0.35);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #fbbf24;
  margin-bottom: 16px;
}

.review-text {
  font-size: 0.97rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  flex-grow: 1;
  font-style: italic;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 14px;
}

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--aurora-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  border: 1px solid var(--border-hud);
}

.reviewer-info h4 {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.reviewer-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(34, 211, 238, 0.4);
}

.faq-question {
  width: 100%;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  background: none;
  border: none;
}

.faq-question svg {
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
  color: var(--aurora-cyan);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 26px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 380px;
  padding: 0 26px 24px 26px;
}

/* ===================================================================
   Bottom Big CTA
   =================================================================== */
.cta-banner-section {
  padding: 90px 0;
}

.cta-banner-card {
  background: linear-gradient(135deg, #090d1f 0%, #101938 50%, #064e3b 100%);
  border: 1px solid var(--border-hud);
  border-radius: var(--radius-lg);
  padding: 64px 44px;
  text-align: center;
  color: #ffffff;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.4), 0 0 40px rgba(34, 211, 238, 0.2);
  position: relative;
  overflow: hidden;
}

.cta-banner-card h2 {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.cta-banner-card p {
  font-size: 1.15rem;
  max-width: 680px;
  margin: 0 auto 38px auto;
  opacity: 0.9;
  line-height: 1.65;
}

/* ===================================================================
   Footer (Strictly 4 Navigation Titles Only)
   =================================================================== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 56px 0 38px 0;
  transition: var(--transition-theme);
  position: relative;
  z-index: 2;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 26px;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.footer-logo-img {
  height: 40px;
  width: auto;
  border-radius: 8px;
  display: block;
  object-fit: contain;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.footer-logo-img:hover {
  transform: scale(1.03);
  opacity: 0.95;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 38px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
}

.footer-nav-link:hover {
  color: var(--aurora-cyan);
  background: var(--bg-surface-alt);
}

.footer-bottom {
  padding-top: 26px;
  border-top: 1px solid var(--border-color);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-domain {
  color: var(--text-secondary);
  font-weight: 600;
}

/* ===================================================================
   Articles / News (推荐资讯) Grid & Content
   =================================================================== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.news-card:hover {
  transform: translateY(-5px);
  border-color: rgba(34, 211, 238, 0.4);
  box-shadow: var(--shadow-hover);
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--aurora-cyan);
  margin-bottom: 14px;
}

.news-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.news-excerpt {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.news-link {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--aurora-cyan);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.news-link:hover {
  text-decoration: underline;
}

/* ===================================================================
   Subpage Base Box
   =================================================================== */
.page-hero {
  padding: 80px 0 44px 0;
  background: var(--hero-glow);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.page-hero-title {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.page-hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
}

.page-content-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-sm);
  margin-top: 40px;
  margin-bottom: 60px;
}

.page-content-box h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 34px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.page-content-box h2:first-of-type {
  margin-top: 0;
}

.page-content-box p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.page-content-box ul, .page-content-box ol {
  padding-left: 24px;
  margin-bottom: 22px;
  color: var(--text-secondary);
}

.page-content-box li {
  margin-bottom: 8px;
  line-height: 1.75;
}

.callout-box {
  background: var(--bg-surface-alt);
  border-left: 4px solid var(--aurora-cyan);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  margin: 24px 0;
}

.callout-box.danger {
  border-left-color: #ef4444;
  background: rgba(239, 68, 68, 0.08);
}

.callout-box.success {
  border-left-color: #10b981;
  background: rgba(16, 185, 129, 0.08);
}

/* ===================================================================
   SEO Long-form Article Styles (TOC, FAQ, Breadcrumbs, Related Reading)
   =================================================================== */
.article-container {
  max-width: 920px;
  margin: 0 auto;
  padding: 40px 24px 80px 24px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumbs a {
  color: var(--text-secondary);
}

.breadcrumbs a:hover {
  color: var(--aurora-cyan);
}

.breadcrumb-sep {
  opacity: 0.5;
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.article-category-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--aurora-cyan);
  border: 1px solid var(--border-hud);
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-bottom: 14px;
}

.article-main-title {
  font-size: 2.35rem;
  font-weight: 900;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  font-family: var(--font-mono);
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Table of Contents (TOC) */
.article-toc {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--aurora-cyan);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 32px 0 40px 0;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.toc-title svg {
  color: var(--aurora-cyan);
}

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

.toc-item a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.toc-item a:hover {
  color: var(--aurora-cyan);
  transform: translateX(4px);
}

.toc-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--aurora-cyan);
  font-weight: 700;
}

/* Article Body Typography */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 44px 0 18px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.015em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 14px 0;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  padding-left: 26px;
  margin-bottom: 24px;
}

.article-body li {
  margin-bottom: 10px;
}

.article-body strong {
  color: var(--text-primary);
  font-weight: 700;
}

.article-body a {
  color: var(--aurora-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

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

/* Comparison Tables in Articles */
.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

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

.article-table th {
  background: var(--bg-surface-alt);
  color: var(--text-primary);
  padding: 14px 18px;
  font-weight: 700;
  border-bottom: 1px solid var(--border-color);
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.article-table tr:last-child td {
  border-bottom: none;
}

/* Mid-Article CTA Card */
.article-cta-box {
  background: linear-gradient(135deg, rgba(9, 13, 31, 0.95), rgba(16, 25, 56, 0.9));
  border: 1px solid var(--border-hud);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  margin: 40px 0;
  color: #ffffff;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.article-cta-box h3 {
  font-size: 1.45rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 10px;
}

.article-cta-box p {
  font-size: 0.98rem;
  color: #cbd5e1;
  max-width: 600px;
  margin: 0 auto 24px auto;
}

/* Article FAQ Section */
.article-faq-section {
  margin: 50px 0 40px 0;
  padding-top: 36px;
  border-top: 2px dashed var(--border-color);
}

.article-faq-section h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.article-faq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

.article-faq-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-faq-card h4 span.q-badge {
  background: var(--primary-light);
  color: var(--aurora-cyan);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 4px;
}

.article-faq-card p {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* Related Reading Section */
.related-reading-section {
  margin-top: 60px;
  padding-top: 36px;
  border-top: 1px solid var(--border-color);
}

.related-reading-section h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.related-card:hover {
  border-color: rgba(34, 211, 238, 0.4);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.related-card-tag {
  font-size: 0.74rem;
  font-family: var(--font-mono);
  color: var(--aurora-cyan);
  margin-bottom: 8px;
}

.related-card-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 10px;
  flex-grow: 1;
}

.related-card-title:hover {
  color: var(--aurora-cyan);
}

.related-card-date {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===================================================================
   Responsive Mobile Adjustments (@media)
   =================================================================== */
@media (max-width: 1024px) {
  .hero-headline {
    font-size: 2.9rem;
  }
  .hero-headline-sub {
    font-size: 2.2rem;
  }
  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .showcase-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }
  .hero-section {
    padding: 72px 0 54px 0;
  }
  .hero-headline {
    font-size: 2.25rem;
  }
  .hero-headline-sub {
    font-size: 1.7rem;
  }
  .hero-intro {
    font-size: 1.05rem;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
    max-width: 340px;
  }
  .hero-telemetry-strip {
    flex-direction: column;
    gap: 12px;
  }
  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .news-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .services-tag-grid {
    grid-template-columns: 1fr;
  }
  .mobile-nav-toggle {
    display: inline-flex;
  }
  .nav-links {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    display: none;
    box-shadow: var(--shadow-lg);
  }
  .nav-links.active {
    display: flex;
  }
  .nav-actions .btn-header-cta {
    display: none;
  }
  .page-content-box {
    padding: 24px 18px;
  }
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .cta-banner-card {
    padding: 44px 22px;
  }
  .cta-banner-card h2 {
    font-size: 1.95rem;
  }
}