/* ===================================================================
   KTM Cloud (KTM 云加速器) - Official Stylesheet (Pure Native CSS3)
   Theme: Cyber Violet & Electric Indigo (Glowing Violet, Deep Indigo & Cyan)
   Performance: Zero External Dependencies, Sub-Second Loading, Ultra-Responsive
   =================================================================== */

:root {
  /* Futuristic Cyber Palette */
  --bg-dark: #0a0b12;
  --bg-surface: #101321;
  --bg-card: #15192c;
  --bg-card-hover: #1d223c;
  --bg-card-glass: rgba(21, 25, 44, 0.75);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-light: rgba(139, 92, 246, 0.22);
  --border-focus: rgba(139, 92, 246, 0.55);

  /* Cyber Violet & Indigo Core */
  --violet-300: #c4b5fd;
  --violet-400: #a78bfa;
  --violet-500: #8b5cf6;
  --violet-600: #7c3aed;
  --violet-700: #6d28d9;
  --violet-glow: rgba(139, 92, 246, 0.35);
  --violet-glow-strong: rgba(124, 58, 237, 0.6);

  --indigo-400: #818cf8;
  --indigo-500: #6366f1;
  --indigo-600: #4f46e5;
  --indigo-glow: rgba(99, 102, 241, 0.35);

  /* Electric Cyan Accents */
  --cyan-400: #22d3ee;
  --cyan-500: #06b6d4;
  --cyan-600: #0891b2;
  --cyan-glow: rgba(6, 182, 212, 0.35);

  /* Typography Colors */
  --text-white: #ffffff;
  --text-silver: #f1f5f9;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Status & Special Badges */
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --amber-glow: rgba(245, 158, 11, 0.25);
  --emerald-400: #34d399;
  --emerald-500: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.25);

  /* Radius & Transitions */
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  line-height: 1.68;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  overflow-x: hidden;
  position: relative;
}

/* Ambient Cyber Grid & Glow Background */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(circle at 50% 0%, rgba(139, 92, 246, 0.12) 0%, transparent 55%),
    radial-gradient(circle at 85% 25%, rgba(6, 182, 212, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 15% 75%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

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

section {
  padding: 86px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 54px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.32);
  color: var(--violet-400);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 18px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.28;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.highlight-gradient {
  background: linear-gradient(135deg, #a78bfa 0%, #8b5cf6 50%, #22d3ee 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ===================================================================
   Buttons & Interactive CTA Components (Distinct, High-Affordance)
   =================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: var(--radius-md);
  font-size: 0.98rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1.5px solid transparent;
  white-space: nowrap;
  letter-spacing: 0.3px;
  position: relative;
  user-select: none;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.btn:active {
  transform: translateY(1px) scale(0.98);
}

.btn:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

/* Primary Button: Distinct Glowing Violet-to-Indigo Gradient with 3D Depth */
.btn-primary {
  background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 50%, #2563eb 100%);
  color: var(--text-white);
  border: 1.5px solid rgba(255, 255, 255, 0.35);
  box-shadow: 
    0 4px 18px rgba(139, 92, 246, 0.45),
    0 1px 3px rgba(0, 0, 0, 0.4),
    inset 0 1px 1px rgba(255, 255, 255, 0.45);
  overflow: hidden;
}

.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -120%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
  transition: 0.6s ease;
}

.btn-primary:hover {
  transform: translateY(-3px);
  background: linear-gradient(135deg, #9a72fa 0%, #7074f5 50%, #3b82f6 100%);
  border-color: rgba(255, 255, 255, 0.6);
  box-shadow: 
    0 8px 32px rgba(139, 92, 246, 0.65),
    0 2px 6px rgba(0, 0, 0, 0.5),
    inset 0 1px 2px rgba(255, 255, 255, 0.6);
}

.btn-primary:hover::after {
  left: 120%;
}

/* Secondary Button: Distinct Dark Glassmorphic with Illuminated Border */
.btn-secondary {
  background: linear-gradient(180deg, rgba(30, 36, 62, 0.85) 0%, rgba(18, 22, 42, 0.95) 100%);
  border: 1.5px solid rgba(139, 92, 246, 0.45);
  color: var(--text-white);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 
    0 4px 14px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.btn-secondary:hover {
  background: linear-gradient(180deg, rgba(42, 50, 84, 0.95) 0%, rgba(26, 32, 60, 0.98) 100%);
  border-color: var(--cyan-400);
  color: #ffffff;
  transform: translateY(-3px);
  box-shadow: 
    0 6px 24px rgba(6, 182, 212, 0.35),
    0 2px 6px rgba(0, 0, 0, 0.4),
    inset 0 1px 1px rgba(255, 255, 255, 0.25);
}

/* Outline Glow Button */
.btn-outline-glow {
  background: rgba(139, 92, 246, 0.12);
  border: 1.5px solid rgba(139, 92, 246, 0.55);
  color: var(--violet-300);
  box-shadow: 0 2px 10px rgba(139, 92, 246, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-outline-glow:hover {
  background: rgba(139, 92, 246, 0.25);
  border-color: var(--cyan-400);
  color: var(--text-white);
  box-shadow: 0 0 24px rgba(139, 92, 246, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 9px 20px;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 16px 38px;
  font-size: 1.08rem;
  border-radius: var(--radius-md);
}

.btn-full {
  width: 100%;
}

/* ===================================================================
   Header & Sticky Navigation Bar (Clear Border & Separation)
   =================================================================== */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 11, 18, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  /* Clear, Prominent Illuminated Border Separating Nav and Body */
  border-bottom: 2px solid rgba(139, 92, 246, 0.45);
  box-shadow: 0 6px 28px rgba(0, 0, 0, 0.7);
  transition: all 0.3s ease;
}

.site-header::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, rgba(139, 92, 246, 0.8) 25%, rgba(34, 211, 238, 0.9) 50%, rgba(139, 92, 246, 0.8) 75%, transparent 100%);
  box-shadow: 0 0 14px rgba(34, 211, 238, 0.6);
  pointer-events: none;
}

.site-header.scrolled {
  background: rgba(10, 11, 18, 0.98);
  border-bottom-color: rgba(34, 211, 238, 0.65);
  box-shadow: 0 10px 38px rgba(0, 0, 0, 0.85), 0 0 20px rgba(139, 92, 246, 0.25);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

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

.brand-logo img {
  height: 38px;
  width: auto;
  display: block;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.925rem;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--violet-500), var(--cyan-400));
  transition: width 0.25s ease;
}

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

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

.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-silver);
  padding: 8px 12px;
  cursor: pointer;
  font-size: 1.25rem;
}

.mobile-drawer {
  display: none;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-light);
  padding: 20px 24px;
}

.mobile-drawer.active {
  display: block;
}

.mobile-drawer ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mobile-drawer .nav-link {
  display: block;
  font-size: 1rem;
  padding: 8px 0;
}

.mobile-drawer .mobile-actions {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ===================================================================
   Hero Section
   =================================================================== */

.hero-section {
  padding: 100px 0 90px 0;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.promo-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(139, 92, 246, 0.14);
  border: 1px solid rgba(139, 92, 246, 0.4);
  box-shadow: 0 0 20px rgba(139, 92, 246, 0.25);
  color: #f1f5f9;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
  animation: pulseBadge 3s infinite ease-in-out;
}

.promo-badge .highlight {
  color: #22d3ee;
  font-weight: 700;
}

@keyframes pulseBadge {
  0%, 100% { border-color: rgba(139, 92, 246, 0.4); box-shadow: 0 0 15px rgba(139, 92, 246, 0.2); }
  50% { border-color: rgba(34, 211, 238, 0.7); box-shadow: 0 0 25px rgba(34, 211, 238, 0.35); }
}

.hero-title {
  font-size: 3.15rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  color: var(--text-white);
  margin-bottom: 22px;
}

.hero-description {
  font-size: 1.125rem;
  line-height: 1.78;
  color: var(--text-secondary);
  margin-bottom: 34px;
  max-width: 620px;
}

.hero-ctas {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

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

.guarantee-item svg {
  color: var(--emerald-400);
}

/* ===================================================================
   Animated Vector Art Showcase (Transparent BG & VPN Marketing Points)
   =================================================================== */

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-vector-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
  background: transparent;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.vector-art-svg {
  width: 100%;
  height: auto;
  max-height: 380px;
  background: transparent;
  filter: drop-shadow(0 15px 35px rgba(139, 92, 246, 0.35));
  animation: floatVector 5s ease-in-out infinite;
}

@keyframes floatVector {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

@keyframes rotateOrbit {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes rotateOrbitReverse {
  from { transform: rotate(360deg); }
  to { transform: rotate(0deg); }
}

@keyframes pulseCoreGlow {
  0%, 100% { filter: drop-shadow(0 0 15px rgba(139, 92, 246, 0.5)); transform: scale(1); }
  50% { filter: drop-shadow(0 0 30px rgba(34, 211, 238, 0.8)); transform: scale(1.04); }
}

/* Floating Marketing Satellites attached to Vector Art */
.marketing-badge {
  position: absolute;
  background: rgba(16, 20, 36, 0.88);
  border: 1.5px solid rgba(139, 92, 246, 0.45);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-full);
  padding: 8px 16px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-white);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5), 0 0 16px rgba(139, 92, 246, 0.2);
  white-space: nowrap;
  transition: all 0.3s ease;
  z-index: 5;
}

.marketing-badge:hover {
  border-color: var(--cyan-400);
  box-shadow: 0 10px 30px rgba(6, 182, 212, 0.4);
  transform: scale(1.06);
}

.marketing-badge.badge-top-left {
  top: 10px;
  left: -12px;
  animation: floatBadge1 4.5s ease-in-out infinite alternate;
}

.marketing-badge.badge-top-right {
  top: 15px;
  right: -10px;
  animation: floatBadge2 5s ease-in-out infinite alternate;
}

.marketing-badge.badge-bottom-left {
  bottom: 25px;
  left: -8px;
  animation: floatBadge2 4.2s ease-in-out infinite alternate;
}

.marketing-badge.badge-bottom-right {
  bottom: 20px;
  right: -12px;
  animation: floatBadge1 4.8s ease-in-out infinite alternate;
}

@keyframes floatBadge1 {
  0% { transform: translateY(0px) rotate(0deg); }
  100% { transform: translateY(-7px) rotate(-1deg); }
}

@keyframes floatBadge2 {
  0% { transform: translateY(0px) rotate(0deg); }
  100% { transform: translateY(-8px) rotate(1deg); }
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.badge-dot.cyan { background: var(--cyan-400); box-shadow: 0 0 8px var(--cyan-400); }
.badge-dot.violet { background: var(--violet-400); box-shadow: 0 0 8px var(--violet-400); }
.badge-dot.emerald { background: var(--emerald-400); box-shadow: 0 0 8px var(--emerald-400); }
.badge-dot.amber { background: var(--amber-400); box-shadow: 0 0 8px var(--amber-400); }

/* Quick Telemetry Bar under Vector Art */
.vector-telemetry-bar {
  margin-top: 18px;
  width: 100%;
  background: rgba(18, 22, 38, 0.7);
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-around;
  backdrop-filter: blur(10px);
}

.telemetry-mini-item {
  text-align: center;
}

.mini-val {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.1;
}

.mini-val.cyan { color: var(--cyan-400); }
.mini-val.emerald { color: var(--emerald-400); }
.mini-val.violet { color: var(--violet-400); }

.mini-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 2px;
}

/* ===================================================================
   Fade In & Out Animation Effects
   =================================================================== */

.fade-in {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1), transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Initial Load Fade In for Hero */
.hero-content {
  animation: heroFadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hero-visual {
  animation: heroFadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

.telemetry-protocol {
  font-size: 0.75rem;
  background: rgba(139, 92, 246, 0.18);
  border: 1px solid rgba(139, 92, 246, 0.3);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  color: var(--violet-300);
  font-weight: 600;
}

.telemetry-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.metric-box {
  background: rgba(10, 11, 18, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  transition: var(--transition);
}

.metric-box:hover {
  border-color: rgba(139, 92, 246, 0.4);
  transform: translateY(-2px);
}

.metric-value {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.1;
  margin-bottom: 4px;
}

.metric-value.cyan { color: var(--cyan-400); }
.metric-value.violet { color: var(--violet-400); }
.metric-value.emerald { color: var(--emerald-400); }

.metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.telemetry-chart {
  background: rgba(10, 11, 18, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 52px;
}

.chart-bar {
  flex: 1;
  background: linear-gradient(180deg, var(--violet-400), var(--indigo-600));
  border-radius: 3px 3px 0 0;
  opacity: 0.75;
  transition: height 0.4s ease, opacity 0.2s ease;
}

.chart-bar:hover {
  opacity: 1;
  background: linear-gradient(180deg, var(--cyan-400), var(--violet-500));
}

/* ===================================================================
   Dynamic Cards Section (核心优势图卡区)
   =================================================================== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 48px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--violet-500), var(--cyan-400));
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  background: var(--bg-card-hover);
  border-color: rgba(139, 92, 246, 0.4);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5), 0 0 25px rgba(139, 92, 246, 0.15);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--violet-400);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 14px;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-silver);
}

.feature-list li svg {
  color: var(--cyan-400);
  flex-shrink: 0;
}

/* Streaming & AI Cards Showcase */
.media-ai-card {
  background: linear-gradient(135deg, rgba(22, 26, 46, 0.9), rgba(16, 20, 36, 0.9));
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
}

.media-ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.media-col-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.service-tag {
  background: rgba(10, 11, 18, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 0.85rem;
  color: var(--text-silver);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.service-tag:hover {
  border-color: rgba(139, 92, 246, 0.5);
  background: rgba(139, 92, 246, 0.15);
  color: var(--text-white);
  transform: translateY(-2px);
}

/* ===================================================================
   Pricing Section (定价卡片区)
   =================================================================== */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6);
  border-color: rgba(139, 92, 246, 0.4);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(27, 33, 60, 0.95) 0%, rgba(18, 22, 40, 0.95) 100%);
  border: 2px solid var(--violet-500);
  box-shadow: 0 15px 50px rgba(124, 58, 237, 0.28);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: 0 25px 65px rgba(124, 58, 237, 0.4);
}

.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--violet-500), var(--cyan-500));
  color: var(--text-white);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 15px var(--violet-glow);
  letter-spacing: 0.5px;
}

.plan-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.plan-tier {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-silver);
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.plan-pill {
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

.plan-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: var(--text-white);
}

.plan-price .currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--violet-400);
}

.plan-price .amount {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -1px;
}

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

.plan-subtext {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.plan-features li svg {
  color: var(--cyan-400);
  margin-top: 3px;
  flex-shrink: 0;
}

/* ===================================================================
   Platform Download Section (支持平台与客户端)
   =================================================================== */

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.platform-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 22px;
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.platform-card:hover {
  transform: translateY(-5px);
  border-color: rgba(139, 92, 246, 0.4);
  background: var(--bg-card-hover);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

.platform-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: var(--violet-400);
}

.platform-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 8px;
}

.platform-apps {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 22px;
  flex-grow: 1;
}

/* ===================================================================
   Why Choose Us Section (深度特性解析区 - SEO & SERP Core)
   =================================================================== */

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

.why-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: var(--transition);
}

.why-card:hover {
  border-color: rgba(6, 182, 212, 0.4);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

.why-emoji {
  font-size: 2rem;
  margin-bottom: 14px;
  display: inline-block;
}

.why-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 10px;
}

.why-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===================================================================
   Secondary Exit CTA Section (底部转化区)
   =================================================================== */

.cta-section {
  padding: 70px 0;
}

.cta-banner {
  background: linear-gradient(135deg, rgba(30, 36, 68, 0.95) 0%, rgba(17, 21, 38, 0.95) 100%);
  border: 1px solid rgba(139, 92, 246, 0.4);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6), 0 0 50px rgba(139, 92, 246, 0.2);
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

.cta-banner h2 {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 16px;
  position: relative;
  z-index: 2;
}

.cta-banner p {
  font-size: 1.1rem;
  color: var(--text-silver);
  max-width: 650px;
  margin: 0 auto 32px auto;
  position: relative;
  z-index: 2;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  position: relative;
  z-index: 2;
  flex-wrap: wrap;
}

/* ===================================================================
   Testimonials Marquee Section (用户评价跑马灯)
   =================================================================== */

.testimonials-section {
  overflow: hidden;
  padding: 80px 0;
}

.marquee-container {
  width: 100%;
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.marquee-track {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: scrollMarquee 38s linear infinite;
}

.marquee-track:hover {
  animation-play-state: paused;
}

@keyframes scrollMarquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.testimonial-card {
  width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex-shrink: 0;
  transition: var(--transition);
}

.testimonial-card:hover {
  border-color: rgba(139, 92, 246, 0.4);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}

.review-stars {
  color: #fbbf24;
  font-size: 1.1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-silver);
  line-height: 1.65;
  margin-bottom: 20px;
  font-style: italic;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 14px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--violet-600), var(--indigo-500));
  color: var(--text-white);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.user-meta .user-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-white);
}

.user-meta .user-role {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===================================================================
   FAQ Section (Accordion with <details> and <summary>)
   =================================================================== */

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item[open] {
  border-color: rgba(139, 92, 246, 0.4);
  background: var(--bg-card-hover);
}

.faq-item summary {
  padding: 22px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-white);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  user-select: none;
}

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

.faq-arrow {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--violet-400);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
  background: rgba(139, 92, 246, 0.2);
  color: var(--cyan-400);
}

.faq-content {
  padding: 0 24px 22px 24px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 16px;
}

/* ===================================================================
   Footer (4 Essential Links Strictly Isolated)
   =================================================================== */

.site-footer {
  background: #07080d;
  border-top: 1px solid rgba(139, 92, 246, 0.2);
  padding: 48px 0 36px 0;
  margin-top: 40px;
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
}

.footer-nav a:hover {
  color: var(--violet-400);
}

.footer-copyright {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===================================================================
   Article & Informational Page Layout Styles
   =================================================================== */

.page-header {
  padding: 60px 0 40px 0;
  background: linear-gradient(180deg, rgba(16, 19, 33, 0.8), transparent);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 48px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  flex-wrap: wrap;
}

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

.breadcrumbs a:hover {
  color: var(--violet-400);
}

.breadcrumbs .separator {
  color: var(--text-muted);
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
}

.article-content {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 48px;
  color: var(--text-primary);
  line-height: 1.85;
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-white);
  margin: 38px 0 16px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--violet-300);
  margin: 28px 0 12px 0;
}

.article-content p {
  margin-bottom: 20px;
  font-size: 1rem;
  color: var(--text-secondary);
}

.article-content ul, .article-content ol {
  margin: 0 0 24px 24px;
  color: var(--text-secondary);
}

.article-content li {
  margin-bottom: 8px;
}

.article-content blockquote {
  border-left: 4px solid var(--violet-500);
  background: rgba(139, 92, 246, 0.08);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: var(--text-silver);
  font-style: italic;
}

.article-content code {
  background: rgba(10, 11, 18, 0.8);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--cyan-400);
  font-size: 0.9em;
}

/* Articles Hub Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: rgba(139, 92, 246, 0.4);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

.article-card-body {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-card-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--cyan-400);
  margin-bottom: 12px;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-white);
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 14px;
}

/* ===================================================================
   Responsive Mobile Media Queries (@media)
   =================================================================== */

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-visual {
    order: -1;
  }
  .hero-telemetry-card {
    max-width: 100%;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .why-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 820px) {
  .nav-menu, .nav-actions {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  .media-ai-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 640px) {
  section {
    padding: 60px 0;
  }
  .hero-section {
    padding: 60px 0 50px 0;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .platforms-grid {
    grid-template-columns: 1fr;
  }
  .why-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .hero-ctas {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-full-mobile {
    width: 100%;
  }
  .cta-banner {
    padding: 38px 20px;
  }
  .cta-banner h2 {
    font-size: 1.8rem;
  }
  .article-content {
    padding: 24px 18px;
  }
  .footer-nav {
    gap: 18px;
  }
}