/* ===================================================================
   Now加速·家宽机场 - Official Stylesheet (Pure CSS3)
   Theme: Crimson Hyperdrive & Radiant Gold on Deep Onyx
   Built with Best Web Design Principles: Tactile Depth, Clear Hierarchy,
   Instant Load Speed (<1s), Smooth Fade In/Out & Micro-Interactions.
   =================================================================== */

:root {
  /* Crimson Hyperdrive & Radiant Gold on Deep Onyx Palette */
  --bg-dark: #08080c;
  --bg-surface: #0e0f17;
  --bg-card: #141522;
  --bg-card-hover: #1b1d2e;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-card: rgba(239, 68, 68, 0.2);
  --border-focus: rgba(239, 68, 68, 0.55);

  /* Primary Accent: Blazing Crimson & Ruby Pulse */
  --crimson-300: #fca5a5;
  --crimson-400: #f87171;
  --crimson-500: #ef4444;
  --crimson-600: #dc2626;
  --crimson-700: #b91c1c;
  --crimson-glow: rgba(239, 68, 68, 0.45);
  --crimson-glow-intense: rgba(239, 68, 68, 0.7);

  /* Accent Highlight: Solar Gold & Radiant Amber */
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --amber-glow: rgba(245, 158, 11, 0.4);

  /* Status Colors */
  --emerald-400: #34d399;
  --emerald-500: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.35);

  /* Typography */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  /* Spacing & Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Animation Timings */
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.18s ease-out;
}

/* Base Reset */
*, *::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: 1.6;
  overflow-x: hidden;
  position: relative;
  background: radial-gradient(circle at 50% 0%, #201018 0%, #08080c 60%);
}

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

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

ul {
  list-style: none;
}

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.text-center {
  text-align: center;
}

/* Typography Helpers */
.gradient-text {
  background: linear-gradient(135deg, #f87171 0%, #ef4444 45%, #fbbf24 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(239, 68, 68, 0.12);
  border: 1.5px solid rgba(239, 68, 68, 0.35);
  color: var(--crimson-400);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 16px;
  box-shadow: 0 2px 10px rgba(239, 68, 68, 0.15);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 50px;
}

/* ===================================================================
   Distinct, Tactile Buttons (Unmistakably Clickable & Elevated)
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  letter-spacing: 0.2px;
}

/* Primary Button: Blazing Crimson Hyperdrive with Gold/Ruby Edge */
.btn-primary {
  background: linear-gradient(135deg, #dc2626 0%, #ef4444 60%, #b91c1c 100%);
  color: #ffffff !important;
  border: 1.5px solid rgba(254, 202, 202, 0.45);
  box-shadow: 
    0 4px 16px rgba(239, 68, 68, 0.48),
    0 1px 2px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #b91c1c 0%, #dc2626 60%, #991b1b 100%);
  border-color: #fca5a5;
  box-shadow: 
    0 6px 26px rgba(239, 68, 68, 0.7),
    0 2px 6px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transform: translateY(-2.5px);
}

.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 
    0 2px 8px rgba(239, 68, 68, 0.4),
    inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Shimmer Light Ray on Primary Buttons */
.btn-primary::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -75%;
  width: 50%;
  height: 200%;
  background: linear-gradient(
    to right, 
    rgba(255, 255, 255, 0) 0%, 
    rgba(255, 255, 255, 0.3) 50%, 
    rgba(255, 255, 255, 0) 100%
  );
  transform: rotate(25deg);
  transition: all 0.6s ease;
  pointer-events: none;
}

.btn-primary:hover::after {
  left: 130%;
}

/* Secondary Button: Elevated Deep Onyx Plate + Defined Crimson Border */
.btn-secondary {
  background: rgba(20, 21, 34, 0.88);
  color: #f1f5f9 !important;
  border: 1.5px solid rgba(239, 68, 68, 0.3);
  box-shadow: 
    0 3px 10px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(30, 32, 50, 0.95);
  border-color: var(--crimson-400);
  color: #ffffff !important;
  box-shadow: 
    0 6px 20px rgba(239, 68, 68, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  transform: translateY(-2.5px);
}

.btn-secondary:active {
  transform: translateY(1px);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

/* Button Sizes */
.btn-sm {
  padding: 9px 20px;
  font-size: 0.925rem;
  border-radius: var(--radius-sm);
}

.btn-md {
  padding: 13px 26px;
  font-size: 1rem;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.15rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   Clear Border Between Top Sticky Nav and Body
   =================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(8, 8, 12, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  /* Clear prominent border and shadow demarcating header from body */
  border-bottom: 2px solid rgba(239, 68, 68, 0.3);
  box-shadow: 
    0 4px 26px rgba(0, 0, 0, 0.85), 
    0 1px 0 rgba(255, 255, 255, 0.06);
  transition: var(--transition);
}

/* Glowing Crimson-to-Amber line at bottom of sticky navbar */
.navbar::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: linear-gradient(
    90deg, 
    transparent 0%, 
    rgba(239, 68, 68, 0.5) 25%, 
    rgba(245, 158, 11, 0.6) 50%, 
    rgba(239, 68, 68, 0.5) 75%, 
    transparent 100%
  );
  pointer-events: none;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.3px;
  cursor: pointer;
  text-decoration: none;
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.08) rotate(-2deg);
}

.brand-logo-img {
  width: 38px;
  height: 38px;
  transition: var(--transition);
  filter: drop-shadow(0 2px 8px var(--crimson-glow));
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 2px;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--crimson-400);
  transition: var(--transition);
  transform: translateX(-50%);
}

.nav-link:hover {
  color: #ffffff;
}

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

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

.mobile-menu-btn {
  display: none;
  color: var(--text-primary);
  padding: 8px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
}

.mobile-drawer {
  display: none;
  background: #0f1019;
  padding: 22px;
  border-bottom: 2px solid var(--border-focus);
  flex-direction: column;
  gap: 16px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.85);
  animation: drawerSlideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes drawerSlideDown {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

.mobile-drawer.open {
  display: flex;
}

/* ===================================================================
   Fade In & Out Animations (Intersection Observer & Scroll Effects)
   =================================================================== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  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);
}

/* Staggered Delay Helpers */
.fade-delay-1 { transition-delay: 0.1s; }
.fade-delay-2 { transition-delay: 0.2s; }
.fade-delay-3 { transition-delay: 0.3s; }
.fade-delay-4 { transition-delay: 0.4s; }

/* ===================================================================
   Hero Section
   =================================================================== */
.hero-section {
  position: relative;
  padding: 85px 0 65px 0;
  overflow: hidden;
}

.hero-glow-1 {
  position: absolute;
  top: -120px;
  left: 20%;
  width: 550px;
  height: 550px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(239, 68, 68, 0.18) 0%, rgba(0, 0, 0, 0) 70%);
  pointer-events: none;
  filter: blur(75px);
}

.hero-glow-2 {
  position: absolute;
  top: 80px;
  right: 15%;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.15) 0%, rgba(0, 0, 0, 0) 70%);
  pointer-events: none;
  filter: blur(75px);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
  margin-bottom: 50px;
}

.hero-text-col {
  z-index: 2;
}

.discount-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(90deg, rgba(245, 158, 11, 0.22) 0%, rgba(239, 68, 68, 0.12) 100%);
  border: 1.5px solid rgba(245, 158, 11, 0.55);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  color: var(--amber-400);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 22px;
  box-shadow: 0 4px 18px var(--amber-glow);
  animation: pulseBadge 3s ease-in-out infinite;
}

@keyframes pulseBadge {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.03); }
}

.hero-title {
  font-size: 3.15rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 38px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.hero-trust-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: rgba(20, 21, 34, 0.75);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 26px;
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

.stat-item {
  padding: 8px;
}

.stat-number {
  font-size: 2.35rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.1;
  margin-bottom: 6px;
  background: linear-gradient(135deg, #ffffff 0%, #fca5a5 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-unit {
  font-size: 1.2rem;
  color: var(--crimson-400);
  margin-left: 2px;
  -webkit-text-fill-color: var(--crimson-400);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 600;
}

/* ===================================================================
   Hero Animated Vector Art on Transparent Background
   =================================================================== */
.hero-art-col {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-graphic-wrap {
  position: relative;
  width: 100%;
  max-width: 480px;
  height: 480px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.art-halo {
  position: absolute;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(239, 68, 68, 0.25) 0%, rgba(245, 158, 11, 0.12) 55%, transparent 75%);
  filter: blur(48px);
  pointer-events: none;
}

/* Floating Marketing Badges with Enhanced Visual Depth */
.art-floating-badge {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(18, 19, 30, 0.92);
  border: 1.5px solid rgba(239, 68, 68, 0.4);
  padding: 11px 18px;
  border-radius: var(--radius-md);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.7), 0 2px 8px rgba(239, 68, 68, 0.25);
  font-size: 0.875rem;
  font-weight: 700;
  backdrop-filter: blur(14px);
  z-index: 5;
  transition: var(--transition);
  color: #ffffff;
}

.art-floating-badge:hover {
  transform: translateY(-4px) scale(1.04);
  border-color: var(--crimson-400);
  box-shadow: 0 16px 40px rgba(239, 68, 68, 0.4);
}

.badge-top-left {
  top: 15px;
  left: -20px;
  animation: floatTopLeft 4.5s ease-in-out infinite alternate;
}

.badge-top-right {
  top: 25px;
  right: -15px;
  animation: floatTopRight 5s ease-in-out infinite alternate;
}

.badge-bottom-right {
  bottom: 25px;
  right: -15px;
  animation: floatBottomRight 4.2s ease-in-out infinite alternate;
}

.badge-bottom-left {
  bottom: 20px;
  left: -10px;
  animation: floatBottomLeft 4.8s ease-in-out infinite alternate;
}

@keyframes floatTopLeft {
  0% { transform: translateY(0); }
  100% { transform: translateY(-12px); }
}

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

@keyframes floatBottomRight {
  0% { transform: translateY(0); }
  100% { transform: translateY(12px); }
}

@keyframes floatBottomLeft {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

.ping-indicator {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--emerald-400);
  box-shadow: 0 0 12px var(--emerald-400);
  position: relative;
}

.ping-indicator::after {
  content: "";
  position: absolute;
  top: -3px;
  left: -3px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1.5px solid var(--emerald-400);
  animation: pingPulse 1.8s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes pingPulse {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

/* Vector Art Animated Classes */
.vector-radar-ring {
  animation: radarRotate 25s linear infinite;
  transform-origin: 220px 220px;
}

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

.vector-radar-reverse {
  animation: radarRotateReverse 32s linear infinite;
  transform-origin: 220px 220px;
}

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

.vector-core-pulse {
  animation: corePulse 3s ease-in-out infinite alternate;
  transform-origin: 220px 220px;
}

@keyframes corePulse {
  0% { transform: scale(0.97); filter: drop-shadow(0 0 12px rgba(239, 68, 68, 0.45)); }
  100% { transform: scale(1.03); filter: drop-shadow(0 0 26px rgba(245, 158, 11, 0.7)); }
}

/* ===================================================================
   Features Section (Dynamic Cards Section)
   =================================================================== */
.features-section {
  padding: 95px 0;
  position: relative;
}

.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 50px;
}

.feature-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--crimson-400), transparent);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5), 0 0 22px rgba(239, 68, 68, 0.25);
}

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

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: rgba(239, 68, 68, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.95rem;
  margin-bottom: 22px;
  border: 1.5px solid rgba(239, 68, 68, 0.3);
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.18);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #ffffff;
}

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

/* Streaming & AI Support Cards */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.showcase-card {
  background: linear-gradient(145deg, #141524 0%, #0e0f1a 100%);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 38px;
  transition: var(--transition);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.showcase-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-focus);
  box-shadow: 0 20px 42px rgba(0, 0, 0, 0.45), 0 0 24px rgba(239, 68, 68, 0.2);
}

.showcase-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.showcase-icon {
  font-size: 2.3rem;
}

.showcase-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: #ffffff;
}

.showcase-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 26px;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.app-tag {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 7px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: #e2e8f0;
  transition: var(--transition);
}

.app-tag:hover {
  background: rgba(239, 68, 68, 0.18);
  border-color: var(--crimson-400);
  color: #ffffff;
  transform: translateY(-2px);
}

/* ===================================================================
   Pricing Section (3-Column Grid)
   =================================================================== */
.pricing-section {
  padding: 95px 0;
  background: radial-gradient(circle at 50% 50%, rgba(239, 68, 68, 0.08) 0%, transparent 70%);
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 42px 34px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-focus);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.5);
}

.pricing-card.featured {
  background: linear-gradient(165deg, #1f1422 0%, #120e18 100%);
  border: 2px solid var(--crimson-400);
  box-shadow: 0 16px 44px var(--crimson-glow);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
  box-shadow: 0 26px 56px rgba(239, 68, 68, 0.6);
}

.popular-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #f59e0b 0%, #fbbf24 100%);
  color: #000000;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 6px 20px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 16px var(--amber-glow);
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 22px;
}

.plan-type {
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--crimson-400);
  letter-spacing: 0.8px;
  margin-bottom: 6px;
}

.plan-name {
  font-size: 1.55rem;
  font-weight: 800;
  color: #ffffff;
}

.price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 18px;
}

.currency {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--crimson-400);
}

.amount {
  font-size: 3.3rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1;
}

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

.plan-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 26px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-subtle);
  min-height: 48px;
}

.features-list {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 36px;
  flex-grow: 1;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.935rem;
  color: #e2e8f0;
}

.feature-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(239, 68, 68, 0.16);
  color: var(--crimson-400);
  font-size: 0.8rem;
  font-weight: 800;
  border: 1px solid rgba(239, 68, 68, 0.35);
}

/* ===================================================================
   Platform Download Section
   =================================================================== */
.download-section {
  padding: 95px 0;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.platform-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 34px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: var(--transition);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.platform-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45), 0 0 20px rgba(239, 68, 68, 0.18);
}

.platform-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  fill: var(--crimson-400);
  filter: drop-shadow(0 2px 8px var(--crimson-glow));
}

.platform-name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #ffffff;
}

.platform-clients {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 24px;
  flex-grow: 1;
}

/* ===================================================================
   Why Choose Section (SEO, GEO & SERP Visual Cards)
   =================================================================== */
.why-us-section {
  padding: 95px 0;
}

.reasons-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.reason-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 30px;
  transition: var(--transition);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.reason-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-5px);
  background: #171828;
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.45);
}

.reason-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.reason-emoji {
  font-size: 1.85rem;
}

.reason-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
}

.reason-desc {
  font-size: 0.935rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================================================
   Bottom CTA Banner (Bounce Traffic Interception)
   =================================================================== */
.cta-banner-section {
  padding: 75px 0 95px 0;
}

.cta-banner-card {
  background: linear-gradient(135deg, #1c0e18 0%, #26111f 50%, #120914 100%);
  border: 2px solid rgba(239, 68, 68, 0.45);
  border-radius: var(--radius-lg);
  padding: 65px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.65), 0 0 35px rgba(239, 68, 68, 0.25);
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin: 20px 0 16px 0;
  color: #ffffff;
}

.cta-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px auto;
  line-height: 1.65;
}

/* ===================================================================
   Testimonials Marquee Section (Seamless Infinite CSS)
   =================================================================== */
.testimonials-section {
  padding: 85px 0;
  overflow: hidden;
}

.marquee-container {
  width: 100%;
  overflow: hidden;
  position: relative;
  padding: 24px 0;
  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: 26px;
  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%); }
}

.review-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 26px;
  width: 350px;
  flex-shrink: 0;
  transition: var(--transition);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.review-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.review-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, #dc2626, #f59e0b);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.15rem;
  box-shadow: 0 3px 10px rgba(239, 68, 68, 0.4);
}

.review-user-name {
  font-weight: 700;
  font-size: 0.985rem;
  color: #ffffff;
}

.review-user-title {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.review-stars {
  color: var(--amber-400);
  font-size: 1.1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-content {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===================================================================
   FAQ Section (<details> and <summary>)
   =================================================================== */
.faq-section {
  padding: 95px 0;
}

.faq-container {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
}

.faq-item[open] {
  border-color: var(--border-focus);
  background: var(--bg-card);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 28px;
  font-size: 1.075rem;
  font-weight: 700;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: var(--transition);
}

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

.faq-question:hover {
  color: var(--crimson-400);
}

.faq-arrow {
  width: 20px;
  height: 20px;
  color: var(--crimson-400);
  transition: transform 0.28s ease;
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 28px 24px 28px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===================================================================
   Footer (Strictly 4 Links Opening in New Tabs)
   =================================================================== */
.footer {
  border-top: 2px solid rgba(239, 68, 68, 0.25);
  padding: 55px 0;
  background: #050508;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 38px;
  margin-bottom: 26px;
}

.footer-link {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
  position: relative;
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--crimson-400);
}

.footer-copyright {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===================================================================
   Subpages Style (About, Terms, Privacy, Sitemap)
   =================================================================== */
.subpage-hero {
  padding: 65px 0 45px 0;
  border-bottom: 1.5px solid var(--border-subtle);
  margin-bottom: 55px;
}

.subpage-content {
  max-width: 880px;
  margin: 0 auto 85px auto;
  line-height: 1.8;
  color: #cbd5e1;
}

.subpage-content h2 {
  font-size: 1.65rem;
  color: #ffffff;
  margin: 38px 0 16px 0;
  font-weight: 800;
  border-left: 4px solid var(--crimson-400);
  padding-left: 14px;
}

.subpage-content h3 {
  font-size: 1.25rem;
  color: #f1f5f9;
  margin: 24px 0 12px 0;
}

.subpage-content p {
  margin-bottom: 16px;
  font-size: 1rem;
}

.subpage-content ul {
  list-style: disc;
  margin-left: 24px;
  margin-bottom: 22px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.subpage-content li {
  color: var(--text-secondary);
}

/* ===================================================================
   Responsive Media Queries (@media)
   =================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 45px;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .hero-art-col {
    margin: 0 auto;
  }

  .cards-grid-3 {
    grid-template-columns: 1fr;
  }

  .media-ai-grid {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  .pricing-card.featured {
    transform: none;
  }

  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }

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

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

@media (max-width: 768px) {
  .nav-links, .nav-actions {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero-title {
    font-size: 2.35rem;
  }

  .hero-trust-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

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

  .section-title {
    font-size: 1.95rem;
  }

  .cta-title {
    font-size: 1.95rem;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-graphic-wrap {
    max-width: 320px;
    height: 320px;
  }

  .badge-top-left {
    left: 0;
    top: 5px;
    font-size: 0.75rem;
    padding: 7px 12px;
  }

  .badge-top-right {
    display: none;
  }

  .badge-bottom-right {
    right: 0;
    bottom: 15px;
    font-size: 0.75rem;
    padding: 7px 12px;
  }

  .badge-bottom-left {
    display: none;
  }

  .stat-number {
    font-size: 1.85rem;
  }
}

/* ===================================================================
   Article Hub ("推荐资讯") & Article Reader Styles (Crimson Theme)
   =================================================================== */
.hub-hero {
  padding: 60px 0 40px 0;
  text-align: center;
}

.hub-hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: #ffffff;
}

.hub-hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto;
  line-height: 1.75;
}

.breadcrumb-nav {
  margin: 24px 0 16px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.breadcrumb-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.breadcrumb-nav a:hover {
  color: var(--crimson-400);
}

.breadcrumb-nav span {
  color: #e2e8f0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin: 40px 0 80px 0;
}

.article-tile {
  background: var(--bg-card);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  position: relative;
}

.article-tile:hover {
  transform: translateY(-7px);
  border-color: var(--border-focus);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.55), 0 0 20px rgba(239, 68, 68, 0.2);
  background: var(--bg-card-hover);
}

.article-tile-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.article-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(239, 68, 68, 0.14);
  border: 1px solid rgba(239, 68, 68, 0.4);
  border-radius: var(--radius-full);
  color: var(--crimson-400);
  font-size: 0.78rem;
  font-weight: 700;
}

.article-tile-date {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.article-tile-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.45;
  color: #ffffff;
  margin-bottom: 14px;
  transition: color var(--transition);
}

.article-tile:hover .article-tile-title {
  color: var(--crimson-400);
}

.article-tile-excerpt {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.article-tile-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.86rem;
}

.article-read-link {
  color: var(--crimson-400);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-read-link:hover {
  color: #ffffff;
}

.article-reading-time {
  color: var(--text-muted);
}

/* Individual Article Reader */
.article-page {
  padding: 40px 0 80px 0;
}

.article-reader-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}

.article-header-meta {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1.5px solid var(--border-card);
}

.article-main-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.35;
  color: #ffffff;
  margin: 16px 0;
  letter-spacing: -0.5px;
}

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

.article-author-info {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-weight: 600;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-body h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: #ffffff;
  margin: 44px 0 18px 0;
  padding-left: 14px;
  border-left: 4px solid var(--crimson-500);
  letter-spacing: -0.3px;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--crimson-400);
  margin: 28px 0 14px 0;
}

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

.article-body strong {
  color: #ffffff;
}

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

.article-body li {
  margin-bottom: 10px;
  line-height: 1.75;
}

.article-body blockquote {
  background: rgba(239, 68, 68, 0.08);
  border-left: 4px solid var(--crimson-500);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 18px 24px;
  margin: 28px 0;
  font-size: 1rem;
  color: #fecaca;
  font-style: normal;
}

/* Table of Contents */
.toc-box {
  background: rgba(20, 21, 34, 0.7);
  border: 1.5px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 30px 0 40px 0;
}

.toc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.toc-list a {
  color: var(--crimson-400);
  font-size: 0.95rem;
}

.toc-list a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
}

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

.article-table th {
  background: var(--bg-card);
  color: var(--crimson-400);
  padding: 12px 16px;
  border: 1px solid var(--border-card);
  font-weight: 700;
}

.article-table td {
  padding: 12px 16px;
  border: 1px solid var(--border-card);
  color: #cbd5e1;
}

.article-table tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

.ext-link {
  color: var(--crimson-400);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--transition-fast);
}

.ext-link:hover {
  color: #fca5a5;
}

.article-callout-card {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.15) 0%, rgba(245, 158, 11, 0.1) 100%), var(--bg-card);
  border: 1.5px solid rgba(239, 68, 68, 0.4);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin: 40px 0;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  text-align: center;
}

.article-callout-card h3,
.article-callout-card h4 {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 12px;
}

.article-callout-card p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 20px auto;
  font-size: 0.95rem;
}

.article-footer-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 50px;
  padding-top: 24px;
  border-top: 1.5px solid var(--border-card);
}

@media (max-width: 900px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-main-title {
    font-size: 1.95rem;
  }
}

@media (max-width: 600px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .hub-hero h1 {
    font-size: 2rem;
  }
  .article-main-title {
    font-size: 1.6rem;
  }
  .article-body {
    font-size: 1rem;
  }
}