/* ==========================================================================
   尔湾云机场 (Irvine Cloud Airport) - 官方网站核心样式表
   品牌概念：尔湾云连接太平洋两端的学习、工作和生活。
   设计配色：云白 (Cloud White)、海洋蓝 (Ocean Blue)、信号橙 (Signal Orange)、墨黑 (Ink Black)
   ========================================================================== */

:root {
  --color-cloud-white: #FFFFFF;
  --color-cloud-bg: #F8FAFC;
  --color-cloud-soft: #F1F5F9;
  
  --color-ocean-50: #F0F9FF;
  --color-ocean-100: #E0F2FE;
  --color-ocean-200: #BAE6FD;
  --color-ocean-400: #38BDF8;
  --color-ocean-500: #0284C7;
  --color-ocean-600: #0369A1;
  --color-ocean-800: #075985;
  --color-ocean-900: #0C4A6E;
  
  --color-signal-orange: #F97316;
  --color-signal-orange-hover: #EA580C;
  --color-signal-orange-light: #FFEDD5;
  --color-signal-orange-glow: rgba(249, 115, 22, 0.25);
  
  --color-ink-black: #0F172A;
  --color-ink-card: #1E293B;
  --color-ink-muted: #475569;
  --color-ink-light: #64748B;
  --color-border: #E2E8F0;
  --color-border-dark: #334155;
  
  --color-success: #10B981;
  --color-success-bg: #ECFDF5;
  
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
  --shadow-glow: 0 0 25px rgba(2, 132, 199, 0.2);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-ink-black);
  background-color: var(--color-cloud-bg);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

button, input, select {
  font-family: inherit;
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.container-narrow {
  max-width: 960px;
}

/* Utility Badges & Tags */
.flight-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.flight-badge-pacific {
  background-color: var(--color-ocean-50);
  color: var(--color-ocean-600);
  border: 1px solid var(--color-ocean-200);
}

.flight-badge-orange {
  background-color: var(--color-signal-orange-light);
  color: var(--color-signal-orange-hover);
  border: 1px solid rgba(249, 115, 22, 0.3);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-success);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-signal-orange);
  color: #FFFFFF;
  box-shadow: 0 4px 14px var(--color-signal-orange-glow);
}

.btn-primary:hover {
  background-color: var(--color-signal-orange-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(249, 115, 22, 0.35);
  color: #FFFFFF;
}

.btn-secondary {
  background-color: var(--color-cloud-white);
  color: var(--color-ocean-600);
  border: 1px solid var(--color-ocean-200);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--color-ocean-50);
  border-color: var(--color-ocean-500);
  color: var(--color-ocean-800);
  transform: translateY(-2px);
}

.btn-dark {
  background-color: var(--color-ink-black);
  color: #FFFFFF;
}

.btn-dark:hover {
  background-color: var(--color-ink-card);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1.125rem;
  border-radius: var(--radius-lg);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

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

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

.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-ocean-500) 0%, var(--color-ocean-800) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.3);
}

.brand-text h1, .brand-text .brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-ink-black);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.brand-text p {
  font-size: 0.75rem;
  color: var(--color-ink-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

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

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-ink-muted);
  position: relative;
  padding: 6px 0;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--color-ocean-600);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--color-ocean-500);
  transition: width var(--transition-fast);
}

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

.header-cta-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-ink-black);
}

/* ==========================================================================
   Hero Section: Coastal Pacific Air Route Concept
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 60px 0 80px 0;
  background: radial-gradient(120% 80% at 50% 0%, #E0F2FE 0%, #F8FAFC 70%);
  overflow: hidden;
}

.hero-flight-line {
  position: absolute;
  top: 15%;
  left: 0;
  width: 100%;
  height: 200px;
  pointer-events: none;
  opacity: 0.4;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 2;
}

/* Hero Content in Dedicated High-Contrast Whitespace Box */
.hero-content-card {
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(226, 232, 240, 0.8);
  border-radius: var(--radius-xl);
  padding: 44px;
  box-shadow: 0 20px 40px -15px rgba(15, 23, 42, 0.08);
  position: relative;
}

.hero-brand-concept {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--color-ocean-50);
  border: 1px solid var(--color-ocean-200);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  color: var(--color-ocean-800);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.22;
  color: var(--color-ink-black);
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-title span.accent-orange {
  color: var(--color-signal-orange);
}

.hero-title span.accent-blue {
  color: var(--color-ocean-600);
}

.hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-ink-muted);
  margin-bottom: 32px;
}

.hero-action-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.hero-meta-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-ink-light);
}

.meta-item svg {
  color: var(--color-ocean-500);
}

/* Hero Media Display */
.hero-media-wrapper {
  position: relative;
}

.hero-photo-frame {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.25);
  border: 3px solid #FFFFFF;
}

.hero-photo-frame img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.hero-photo-frame:hover img {
  transform: scale(1.02);
}

.hero-photo-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.1) 0%, rgba(15, 23, 42, 0.65) 100%);
}

.hero-photo-caption {
  position: absolute;
  bottom: 24px;
  left: 24px;
  right: 24px;
  color: #FFFFFF;
}

.hero-photo-caption .caption-tag {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #BAE6FD;
  font-weight: 600;
  margin-bottom: 4px;
}

.hero-photo-caption .caption-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Floating Real Device UI Overlay */
.hero-device-floating-card {
  position: absolute;
  bottom: -24px;
  left: -28px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  box-shadow: 0 15px 30px rgba(15, 23, 42, 0.15);
  display: flex;
  align-items: center;
  gap: 16px;
  z-index: 10;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.device-signal-ring {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-ocean-50);
  border: 2px solid var(--color-ocean-500);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ocean-600);
}

.device-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-ink-black);
}

.device-info p {
  font-size: 0.8rem;
  color: var(--color-ink-light);
}

/* ==========================================================================
   Route Chapter: 横向路线贯穿 (尔湾 → 洛杉矶 → 东京 → 香港 → 新加坡)
   ========================================================================== */
.route-section {
  padding: 90px 0;
  background-color: #FFFFFF;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px auto;
}

.section-subtitle {
  display: inline-block;
  color: var(--color-signal-orange);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-ink-black);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-description {
  font-size: 1.05rem;
  color: var(--color-ink-muted);
  line-height: 1.7;
}

/* Flight Path Horizontal Ribbon */
.flight-path-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-ocean-50);
  border: 1px solid var(--color-ocean-200);
  border-radius: var(--radius-xl);
  padding: 20px 32px;
  margin-bottom: 48px;
  position: relative;
  overflow-x: auto;
}

.path-station {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 2;
  min-width: 90px;
}

.station-code {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--color-ocean-800);
  letter-spacing: 0.05em;
}

.station-city {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-ink-black);
}

.station-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: #FFFFFF;
  border: 3px solid var(--color-ocean-500);
  margin: 8px 0;
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.2);
}

.station-status {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-success);
}

.path-line-segment {
  flex-grow: 1;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--color-ocean-400), var(--color-ocean-400) 6px, transparent 6px, transparent 12px);
  position: relative;
  margin: 0 10px;
}

.path-plane-icon {
  position: absolute;
  top: -10px;
  left: 45%;
  color: var(--color-signal-orange);
  animation: plane-flight 8s linear infinite;
}

@keyframes plane-flight {
  0% { left: 5%; }
  50% { left: 90%; }
  100% { left: 5%; }
}

/* Interleaved City Cards: Large Typography + Wide Photos */
.cities-grid {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.city-feature-row {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 36px;
  align-items: center;
  background-color: var(--color-cloud-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  padding: 32px;
  transition: all var(--transition-normal);
}

.city-feature-row:hover {
  box-shadow: var(--shadow-xl);
  border-color: var(--color-ocean-200);
  transform: translateY(-3px);
}

.city-feature-row.reverse {
  grid-template-columns: 1.15fr 1fr;
}

.city-feature-row.reverse .city-info {
  order: 2;
}

.city-feature-row.reverse .city-image-box {
  order: 1;
}

.city-image-box {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 320px;
}

.city-image-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.city-image-box:hover img {
  transform: scale(1.04);
}

.city-image-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(8px);
  color: #FFFFFF;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.city-iata-code {
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--color-ocean-100);
  line-height: 1;
  margin-bottom: -10px;
  letter-spacing: -0.04em;
}

.city-info h3 {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--color-ink-black);
  margin-bottom: 8px;
}

.city-tagline {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-signal-orange);
  margin-bottom: 16px;
}

.city-desc {
  font-size: 0.95rem;
  color: var(--color-ink-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}

.city-specs-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  background-color: #FFFFFF;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.spec-cell {
  display: flex;
  flex-direction: column;
}

.spec-cell .spec-label {
  font-size: 0.75rem;
  color: var(--color-ink-light);
  font-weight: 500;
}

.spec-cell .spec-val {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-ocean-900);
}

/* ==========================================================================
   Core Advantages Section
   ========================================================================== */
.advantages-section {
  padding: 90px 0;
  background: linear-gradient(180deg, #FFFFFF 0%, var(--color-cloud-soft) 100%);
}

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

.adv-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.adv-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-ocean-500), var(--color-signal-orange));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.adv-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-ocean-200);
}

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

.adv-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background-color: var(--color-ocean-50);
  color: var(--color-ocean-600);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: transform var(--transition-fast);
}

.adv-card:hover .adv-icon-wrap {
  background-color: var(--color-ocean-500);
  color: #FFFFFF;
  transform: rotate(6deg) scale(1.05);
}

.adv-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink-black);
  margin-bottom: 12px;
}

.adv-card p {
  font-size: 0.95rem;
  color: var(--color-ink-muted);
  line-height: 1.65;
}

/* ==========================================================================
   Pricing / Boarding Class Hierarchy (登机信息层级)
   ========================================================================== */
.pricing-section {
  padding: 90px 0;
  background-color: var(--color-cloud-bg);
  position: relative;
}

.billing-switch-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.billing-switch {
  display: inline-flex;
  background: #E2E8F0;
  padding: 4px;
  border-radius: var(--radius-full);
}

.billing-opt {
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  background: transparent;
  color: var(--color-ink-muted);
}

.billing-opt.active {
  background: #FFFFFF;
  color: var(--color-ocean-600);
  box-shadow: var(--shadow-sm);
}

.discount-tag {
  background-color: var(--color-signal-orange);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
}

/* Modern Boarding Pass Hierarchy */
.boarding-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

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

.boarding-card.popular {
  border: 2px solid var(--color-signal-orange);
  box-shadow: 0 12px 30px rgba(249, 115, 22, 0.15);
}

.popular-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--color-signal-orange);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.boarding-header {
  padding: 28px 28px 20px 28px;
  border-bottom: 1px dashed var(--color-border);
  background: linear-gradient(180deg, #FFFFFF 0%, var(--color-cloud-soft) 100%);
}

.flight-class-code {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-ocean-600);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.boarding-header h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-ink-black);
  margin-bottom: 8px;
}

.boarding-header .class-desc {
  font-size: 0.875rem;
  color: var(--color-ink-light);
}

.boarding-price-box {
  padding: 24px 28px;
  border-bottom: 1px solid var(--color-border);
  background-color: #FFFFFF;
}

.price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink-black);
}

.price-amount {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--color-ink-black);
  letter-spacing: -0.03em;
  line-height: 1;
}

.price-period {
  font-size: 0.875rem;
  color: var(--color-ink-light);
  font-weight: 500;
}

/* Boarding Specs (Baggage / Gate / Seats) */
.boarding-specs {
  padding: 24px 28px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.spec-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9rem;
}

.spec-name {
  color: var(--color-ink-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.spec-val-strong {
  font-weight: 700;
  color: var(--color-ink-black);
}

.boarding-perks {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--color-cloud-soft);
}

.boarding-perks li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--color-ink-muted);
}

.boarding-perks li svg {
  flex-shrink: 0;
  color: var(--color-success);
  margin-top: 2px;
}

.boarding-footer {
  padding: 24px 28px;
  background-color: var(--color-cloud-soft);
}

.boarding-footer .btn {
  width: 100%;
}

/* ==========================================================================
   Journey Walkthrough (清晰旅程 4 步)
   选择方案 → 安装客户端 → 选择节点 → 开始连接
   ========================================================================== */
.journey-section {
  padding: 90px 0;
  background-color: #FFFFFF;
}

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

.step-card {
  background: var(--color-cloud-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  position: relative;
  transition: all var(--transition-normal);
}

.step-card:hover {
  border-color: var(--color-ocean-400);
  background-color: #FFFFFF;
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.step-number {
  position: absolute;
  top: 18px;
  right: 20px;
  font-size: 2.25rem;
  font-weight: 900;
  color: var(--color-ocean-100);
  line-height: 1;
}

.step-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  background: var(--color-ocean-500);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.step-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-ink-black);
  margin-bottom: 10px;
}

.step-card p {
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Multi-platform Tutorials Chapter (Clash / Clash Party / iOS / Win / Mac)
   ========================================================================== */
.tutorials-hub-section {
  padding: 90px 0;
  background-color: var(--color-cloud-soft);
}

.tutorial-tabs-header {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.tutorial-tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-ink-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tutorial-tab-btn:hover {
  border-color: var(--color-ocean-500);
  color: var(--color-ocean-600);
}

.tutorial-tab-btn.active {
  background-color: var(--color-ocean-600);
  color: #FFFFFF;
  border-color: var(--color-ocean-600);
  box-shadow: 0 4px 12px rgba(3, 105, 161, 0.25);
}

.tutorial-content-pane {
  display: none;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 44px;
  box-shadow: var(--shadow-lg);
}

.tutorial-content-pane.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.tutorial-pane-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: flex-start;
}

.tut-steps-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.tut-step-item {
  display: flex;
  gap: 18px;
}

.tut-step-badge {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-ocean-50);
  color: var(--color-ocean-600);
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-ocean-200);
}

.tut-step-body h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ink-black);
  margin-bottom: 6px;
}

.tut-step-body p {
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  line-height: 1.6;
}

.tut-code-box {
  background-color: var(--color-ink-black);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  color: #F8FAFC;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.85rem;
  margin-top: 10px;
  position: relative;
  overflow-x: auto;
}

.tut-code-copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: #FFFFFF;
  padding: 4px 10px;
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.tut-code-copy-btn:hover {
  background: var(--color-signal-orange);
}

.tut-preview-box {
  background: var(--color-cloud-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.tut-preview-box h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-ink-black);
  margin-bottom: 12px;
}

.tut-feature-checks {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.tut-feature-checks li {
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.tut-feature-checks li svg {
  color: var(--color-success);
}

/* ==========================================================================
   Target Audience Section (适合人群)
   ========================================================================== */
.audience-section {
  padding: 90px 0;
  background-color: #FFFFFF;
}

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

.audience-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-cloud-bg);
  transition: all var(--transition-normal);
}

.audience-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-ocean-400);
}

.audience-img-wrap {
  height: 180px;
  overflow: hidden;
}

.audience-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.audience-card:hover .audience-img-wrap img {
  transform: scale(1.06);
}

.audience-body {
  padding: 24px;
}

.audience-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ink-black);
  margin-bottom: 8px;
}

.audience-body p {
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Testimonials / Reviews (用户口碑)
   ========================================================================== */
.reviews-section {
  padding: 90px 0;
  background: linear-gradient(180deg, var(--color-cloud-soft) 0%, #FFFFFF 100%);
}

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

.review-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #F59E0B;
  margin-bottom: 16px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--color-ink-muted);
  line-height: 1.65;
  margin-bottom: 24px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-ocean-100);
  color: var(--color-ocean-700);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-ink-black);
}

.author-info p {
  font-size: 0.8rem;
  color: var(--color-ink-light);
}

/* ==========================================================================
   FAQ Section (常见问题)
   ========================================================================== */
.faq-section {
  padding: 90px 0;
  background-color: #FFFFFF;
}

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

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

.faq-item:hover {
  border-color: var(--color-ocean-300);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ink-black);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
}

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
  background: var(--color-ocean-500);
  color: #FFFFFF;
  border-color: var(--color-ocean-500);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  color: var(--color-ink-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 400px;
  padding: 0 24px 22px 24px;
}

/* ==========================================================================
   Articles & Knowledge Hub Preview (文章目录与出海指南)
   ========================================================================== */
.articles-section {
  padding: 90px 0;
  background-color: var(--color-cloud-bg);
}

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

.article-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-ocean-300);
}

.article-thumbnail {
  height: 200px;
  position: relative;
  overflow: hidden;
}

.article-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .article-thumbnail img {
  transform: scale(1.05);
}

.article-category {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(4px);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

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

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--color-ink-light);
  margin-bottom: 10px;
}

.article-card-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ink-black);
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-card-body p {
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-ocean-600);
}

.article-read-more:hover {
  color: var(--color-signal-orange);
}

/* ==========================================================================
   Article Detail Page Layout (SEO Article Template)
   ========================================================================== */
.article-detail-header {
  padding: 60px 0 40px 0;
  background: linear-gradient(180deg, var(--color-ocean-50) 0%, var(--color-cloud-bg) 100%);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-ink-light);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--color-ocean-600);
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.article-headline {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-ink-black);
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.article-submeta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  flex-wrap: wrap;
}

.article-main-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
  padding: 60px 0;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #1E293B;
}

.article-content h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-ink-black);
  margin: 40px 0 20px 0;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-ocean-100);
  position: relative;
}

.article-content h2::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background-color: var(--color-signal-orange);
}

.article-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-ink-black);
  margin: 28px 0 14px 0;
}

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

.article-content ul, .article-content ol {
  margin: 16px 0 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-content li {
  line-height: 1.7;
}

.article-content blockquote {
  background: var(--color-ocean-50);
  border-left: 4px solid var(--color-ocean-500);
  padding: 18px 24px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
  font-style: italic;
  color: var(--color-ocean-900);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.95rem;
}

.article-content th, .article-content td {
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  text-align: left;
}

.article-content th {
  background-color: var(--color-cloud-soft);
  font-weight: 700;
  color: var(--color-ink-black);
}

.article-content tr:nth-child(even) {
  background-color: #F8FAFC;
}

.article-img-figure {
  margin: 32px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.article-img-figure figcaption {
  font-size: 0.85rem;
  color: var(--color-ink-light);
  text-align: center;
  padding: 10px;
  background: #F1F5F9;
}

/* Callout Box inside Article */
.article-cta-box {
  background: linear-gradient(135deg, var(--color-ocean-900) 0%, var(--color-ink-black) 100%);
  border-radius: var(--radius-xl);
  padding: 36px;
  color: #FFFFFF;
  margin: 40px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
  box-shadow: var(--shadow-xl);
}

.article-cta-box h3 {
  font-size: 1.5rem;
  color: #FFFFFF;
  margin: 0;
}

.article-cta-box p {
  color: var(--color-ocean-200);
  margin: 0;
}

/* Sidebar for Articles */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.sidebar-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.sidebar-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ink-black);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.related-articles-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.related-item a {
  display: block;
}

.related-item .rel-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-ink-black);
  line-height: 1.4;
  margin-bottom: 4px;
}

.related-item:hover .rel-title {
  color: var(--color-ocean-600);
}

.related-item .rel-date {
  font-size: 0.75rem;
  color: var(--color-ink-light);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-ink-black);
  color: #94A3B8;
  padding: 80px 0 30px 0;
  margin-top: auto;
  border-top: 1px solid var(--color-border-dark);
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #94A3B8;
  margin-bottom: 24px;
}

.footer-route-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: #1E293B;
  border: 1px solid #334155;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: #38BDF8;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col a {
  font-size: 0.875rem;
  color: #94A3B8;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid #1E293B;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #64748B;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a:hover {
  color: #CBD5E1;
}

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-media-wrapper {
    order: -1;
  }
  
  .hero-photo-frame img {
    height: 360px;
  }

  .city-feature-row, .city-feature-row.reverse {
    grid-template-columns: 1fr;
  }
  
  .city-feature-row.reverse .city-info {
    order: 1;
  }
  
  .city-feature-row.reverse .city-image-box {
    order: 2;
  }

  .pricing-grid, .advantages-grid, .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .article-main-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .header-cta-group .btn-secondary {
    display: none;
  }
  
  .mobile-menu-btn {
    display: block;
  }

  .hero-title {
    font-size: 2.1rem;
  }

  .hero-content-card {
    padding: 28px 20px;
  }

  .hero-device-floating-card {
    position: static;
    margin-top: 16px;
  }

  .flight-path-nav {
    justify-content: flex-start;
    gap: 16px;
    padding: 16px;
  }

  .path-line-segment {
    min-width: 30px;
  }

  .pricing-grid, .advantages-grid, .reviews-grid, .articles-grid, .audience-grid, .journey-steps-grid {
    grid-template-columns: 1fr;
  }

  .tutorial-pane-grid {
    grid-template-columns: 1fr;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.mobile-nav-drawer.open {
  display: block;
  opacity: 1;
}

.drawer-pane {
  position: absolute;
  top: 0;
  right: 0;
  width: 80%;
  max-width: 320px;
  height: 100%;
  background: #FFFFFF;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  box-shadow: var(--shadow-xl);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 16px;
}

.drawer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.drawer-links a {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-ink-black);
}

.drawer-links a:hover {
  color: var(--color-ocean-600);
}