/* ===================================================================
   iKuuu VPN - Tactile Hydro-Gel Glassmorphic UI 样式系统
   - Luminous Fluid Palette:
     * Milk-froth white: #faf9f6
     * Soft aqua cyan: #06b6d4
     * Midnight indigo typography: #0f172a / #1e1b4b
   - Pillowy liquid-surface layout: 28px rounded corner radii
   - Refractive rims & deep diffuse ambient fluid shadows
   - Surface-tension elastomeric compression & jelly bounce-back
   =================================================================== */

:root {
  /* 白天模式 (默认)：温润奶沫白 + 水感青蓝 */
  --bg-primary: #faf9f6;
  --bg-secondary: #f3f6f8;
  --bg-tertiary: #e9eff4;

  /* 水凝胶玻璃拟态瓷元变量 */
  --gel-surface: rgba(255, 255, 255, 0.72);
  --gel-surface-elevated: rgba(255, 255, 255, 0.88);
  --gel-surface-hover: rgba(255, 255, 255, 0.95);
  --gel-glass-nav: rgba(250, 249, 246, 0.82);

  /* 水滴折射边缘与内发光 */
  --gel-border: rgba(255, 255, 255, 0.9);
  --gel-border-subtle: rgba(6, 182, 212, 0.18);
  --gel-rim-highlight: inset 0 2px 4px 0 rgba(255, 255, 255, 0.95), inset 0 -2px 6px 0 rgba(6, 182, 212, 0.12);
  --gel-refraction: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(6, 182, 212, 0.15) 50%, rgba(255, 255, 255, 0.6) 100%);

  /* 文字排版：午夜靛青 */
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  --text-indigo: #1e1b4b;

  /* 主题流体色相 */
  --accent-cyan: #06b6d4;
  --accent-cyan-deep: #0891b2;
  --accent-cyan-light: #67e8f9;
  --accent-cyan-glow: rgba(6, 182, 212, 0.22);
  --accent-fluid-gradient: linear-gradient(135deg, #06b6d4 0%, #0284c7 50%, #4f46e5 100%);
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-purple: #8b5cf6;

  /* 悬浮柔体深度漫反射投影 (Fluid Suspension Shadows) */
  --gel-shadow-sm: 0 4px 16px -2px rgba(6, 182, 212, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --gel-shadow-md: 0 16px 36px -8px rgba(6, 182, 212, 0.14), 0 8px 16px -4px rgba(15, 23, 42, 0.05);
  --gel-shadow-lg: 0 28px 56px -12px rgba(6, 182, 212, 0.2), 0 12px 24px -6px rgba(15, 23, 42, 0.06);
  --gel-shadow-glow: 0 0 40px 0 rgba(6, 182, 212, 0.25);

  /* 枕状圆角 (Pillowy generous rounded corner radii 28px) */
  --radius-gel: 28px;
  --radius-pill: 9999px;
  --radius-inner: 18px;
  --radius-sm: 12px;

  /* 水凝胶弹性阻尼动力学曲线 (Fluid surface tension & jelly bounce) */
  --elastic-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --fluid-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-gel: 0.35s var(--elastic-bounce);
  --transition-color: 0.3s ease;

  --max-width: 1240px;
}

/* 夜间深海流体模式 (Deep Oceanic Fluid Mode) */
[data-theme="dark"] {
  --bg-primary: #070b12;
  --bg-secondary: #0c121e;
  --bg-tertiary: #131c2e;

  --gel-surface: rgba(16, 24, 40, 0.72);
  --gel-surface-elevated: rgba(22, 33, 56, 0.88);
  --gel-surface-hover: rgba(28, 42, 70, 0.95);
  --gel-glass-nav: rgba(7, 11, 18, 0.82);

  --gel-border: rgba(34, 211, 238, 0.25);
  --gel-border-subtle: rgba(34, 211, 238, 0.12);
  --gel-rim-highlight: inset 0 2px 4px 0 rgba(255, 255, 255, 0.18), inset 0 -2px 6px 0 rgba(6, 182, 212, 0.25);
  --gel-refraction: linear-gradient(135deg, rgba(34, 211, 238, 0.3) 0%, rgba(6, 182, 212, 0.08) 50%, rgba(255, 255, 255, 0.1) 100%);

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --text-inverse: #070b12;
  --text-indigo: #e0e7ff;

  --accent-cyan: #22d3ee;
  --accent-cyan-deep: #06b6d4;
  --accent-cyan-light: #a5f3fc;
  --accent-cyan-glow: rgba(34, 211, 238, 0.3);
  --accent-fluid-gradient: linear-gradient(135deg, #22d3ee 0%, #38bdf8 50%, #6366f1 100%);

  --gel-shadow-sm: 0 4px 20px -2px rgba(0, 0, 0, 0.5);
  --gel-shadow-md: 0 16px 40px -8px rgba(0, 0, 0, 0.65), 0 0 20px rgba(6, 182, 212, 0.15);
  --gel-shadow-lg: 0 30px 60px -12px rgba(0, 0, 0, 0.8), 0 0 35px rgba(6, 182, 212, 0.22);
  --gel-shadow-glow: 0 0 50px 0 rgba(34, 211, 238, 0.35);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-color), color var(--transition-color);
  overflow-x: hidden;
  position: relative;
}

/* 背景光泽流体扰动（Caustics ambient light wash） */
.caustics-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  background: 
    radial-gradient(circle at 18% 15%, var(--accent-cyan-glow) 0%, transparent 45%),
    radial-gradient(circle at 82% 40%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 50% 85%, var(--accent-cyan-glow) 0%, transparent 45%);
  filter: blur(40px);
  opacity: 0.85;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
  position: relative;
  z-index: 1;
}

a {
  color: inherit;
  text-decoration: none;
}

img, svg {
  vertical-align: middle;
}

ul, ol {
  list-style: none;
}

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

/* 水凝胶玻璃瓦片容器通用类 (Hydro-Gel Tile) */
.gel-card {
  background: var(--gel-surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-radius: var(--radius-gel);
  border: 1.5px solid var(--gel-border);
  box-shadow: var(--gel-shadow-md), var(--gel-rim-highlight);
  transition: transform var(--transition-gel), box-shadow var(--transition-gel), background var(--transition-color), border-color var(--transition-color);
  position: relative;
  overflow: hidden;
}

.gel-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.9), transparent);
  pointer-events: none;
}

.gel-card:hover {
  transform: translateY(-4px) scale(1.008);
  box-shadow: var(--gel-shadow-lg), var(--gel-shadow-glow), var(--gel-rim-highlight);
  background: var(--gel-surface-hover);
}

/* 顶栏导航 (Floating Hydro-Gel Navbar) */
.header {
  position: sticky;
  top: 14px;
  z-index: 100;
  margin: 0 auto;
  max-width: var(--max-width);
  padding: 0 16px;
}

.nav-wrapper {
  background: var(--gel-glass-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--gel-border);
  box-shadow: var(--gel-shadow-sm), var(--gel-rim-highlight);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  padding: 0 22px;
  transition: all var(--transition-gel);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.32rem;
  letter-spacing: -0.02em;
}

.brand-icon-wrapper {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: var(--accent-fluid-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 6px 16px var(--accent-cyan-glow);
  transition: transform var(--transition-gel);
}

.brand-logo:hover .brand-icon-wrapper {
  transform: scale(1.1) rotate(5deg);
}

.brand-logo-img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: contain;
  box-shadow: 0 4px 14px var(--accent-cyan-glow);
  border: 2px solid var(--gel-border);
  transition: transform var(--transition-gel), box-shadow var(--transition-gel);
  background: #ffffff;
  display: block;
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 8px 20px var(--accent-cyan-glow);
}

.brand-name {
  background: var(--accent-fluid-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 900;
}

/* 导航目录 (包含首页、核心优势、流媒体解锁、AI智能支持、套餐价格、用户评价、常见问题、推荐资讯) */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-item-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 8px 13px;
  border-radius: var(--radius-pill);
  transition: all var(--transition-gel);
  position: relative;
  white-space: nowrap;
}

.nav-item-link:hover,
.nav-item-link.active {
  color: var(--accent-cyan-deep);
  background: rgba(6, 182, 212, 0.1);
  transform: translateY(-1px);
}

/* 特色‘推荐资讯’高亮入口标签 */
.nav-item-news {
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan-deep) !important;
  border: 1px solid rgba(6, 182, 212, 0.3);
  position: relative;
}

.nav-item-news::after {
  content: 'HOT';
  position: absolute;
  top: -6px;
  right: -4px;
  background: var(--accent-fluid-gradient);
  color: #fff;
  font-size: 0.6rem;
  font-weight: 800;
  padding: 1px 5px;
  border-radius: 6px;
  line-height: 1.2;
}

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

/* 昼夜模式切换按钮（质感水凝胶磨砂透明，精致专业SVG，弹润反馈） */
.theme-toggle-btn {
  position: relative;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  background: var(--gel-surface);
  border: 1.5px solid var(--gel-border);
  box-shadow: var(--gel-shadow-sm), var(--gel-rim-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-gel);
  overflow: hidden;
}

.theme-toggle-btn:hover {
  background: var(--gel-surface-hover);
  color: var(--accent-cyan-deep);
  transform: scale(1.08);
  box-shadow: var(--gel-shadow-md), 0 0 16px var(--accent-cyan-glow);
}

.theme-toggle-btn:active {
  transform: scale(0.92);
}

.theme-icon {
  position: absolute;
  width: 20px;
  height: 20px;
  transition: transform 0.4s var(--elastic-bounce), opacity 0.3s ease;
}

/* 白天模式 */
html:not([data-theme="dark"]) .icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}
html:not([data-theme="dark"]) .icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.4);
}

/* 夜间模式 */
[data-theme="dark"] .icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.4);
}
[data-theme="dark"] .icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* 按钮通用系统 (弹性胶态动力学反馈) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 11px 24px;
  border-radius: var(--radius-pill);
  transition: transform var(--transition-gel), box-shadow var(--transition-gel), filter var(--transition-color);
  white-space: nowrap;
  user-select: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent-fluid-gradient);
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 8px 24px -4px var(--accent-cyan-glow), inset 0 2px 2px rgba(255, 255, 255, 0.5);
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 14px 32px -4px var(--accent-cyan-glow), 0 0 24px rgba(6, 182, 212, 0.4);
  filter: brightness(1.05);
}

.btn-primary:active {
  transform: scale(0.95);
  box-shadow: 0 4px 12px var(--accent-cyan-glow);
}

.btn-secondary {
  background: var(--gel-surface);
  color: var(--text-primary);
  border: 1.5px solid var(--gel-border);
  box-shadow: var(--gel-shadow-sm), var(--gel-rim-highlight);
}

.btn-secondary:hover {
  background: var(--gel-surface-hover);
  transform: translateY(-2px) scale(1.02);
  border-color: var(--accent-cyan);
}

.btn-secondary:active {
  transform: scale(0.95);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.08rem;
}

/* 徽章 (Gel Droplet Badge) */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 700;
  background: var(--gel-surface);
  color: var(--accent-cyan-deep);
  border: 1.5px solid var(--gel-border);
  box-shadow: var(--gel-shadow-sm), var(--gel-rim-highlight);
}

.droplet-pulse {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7);
  animation: droplet-wave 2.2s infinite;
}

@keyframes droplet-wave {
  0% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 10px rgba(6, 182, 212, 0); }
  100% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(6, 182, 212, 0); }
}

/* 主视觉区 (Hero Section) */
.hero-section {
  position: relative;
  padding: 70px 0 90px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 50px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.hero-title {
  font-size: 3.35rem;
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.03em;
  color: var(--text-indigo);
}

.brand-title-badge {
  display: inline-block;
  background: var(--accent-fluid-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 620px;
}

.hero-ctas {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.hero-trust-bar {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-top: 14px;
  padding-top: 24px;
  border-top: 1px dashed var(--border-subtle, rgba(6, 182, 212, 0.2));
  font-size: 0.9rem;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--text-secondary);
}

.trust-item svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* 核心水凝胶模块：每日签到与免费配额互动水滴卡片 (Daily Quota & Check-in Hydro-Gel Tile) */
.quota-interactive-tile {
  background: var(--gel-surface);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  border-radius: var(--radius-gel);
  border: 1.5px solid var(--gel-border);
  box-shadow: var(--gel-shadow-lg), var(--gel-rim-highlight);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  overflow: hidden;
}

.quota-tile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quota-user-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan-deep);
  background: rgba(6, 182, 212, 0.12);
  padding: 5px 12px;
  border-radius: var(--radius-pill);
}

.quota-progress-box {
  background: var(--bg-secondary);
  border: 1px solid var(--gel-border-subtle);
  border-radius: var(--radius-inner);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quota-progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.quota-amount {
  font-size: 1.7rem;
  font-weight: 900;
  color: var(--accent-cyan-deep);
}

.quota-limit {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.fluid-progress-bar {
  width: 100%;
  height: 12px;
  border-radius: var(--radius-pill);
  background: rgba(6, 182, 212, 0.15);
  overflow: hidden;
  position: relative;
}

.fluid-progress-fill {
  height: 100%;
  width: 68%;
  background: var(--accent-fluid-gradient);
  border-radius: var(--radius-pill);
  box-shadow: 0 0 12px var(--accent-cyan-glow);
  transition: width 0.8s var(--elastic-bounce);
}

/* 签到水滴涟漪互动触发按钮 (Droplet Splash Ripple & Jelly Bounce Interaction) */
.checkin-fluid-btn {
  position: relative;
  background: var(--accent-fluid-gradient);
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-inner);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 800;
  box-shadow: 0 10px 24px -4px var(--accent-cyan-glow), inset 0 2px 2px rgba(255, 255, 255, 0.5);
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.4s var(--elastic-bounce), box-shadow 0.3s ease;
}

.checkin-fluid-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 14px 30px -4px var(--accent-cyan-glow), 0 0 20px rgba(6, 182, 212, 0.5);
}

.checkin-fluid-btn:active {
  transform: scale(0.94); /* Elastomeric compression on press */
}

/* 水滴微动效波纹 (Droplet Ripple) */
.ripple-wave {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.8) 0%, rgba(6, 182, 212, 0) 70%);
  transform: scale(0);
  animation: ripple-splash 0.75s ease-out;
  pointer-events: none;
}

@keyframes ripple-splash {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

.checkin-feedback-toast {
  display: none;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--accent-green);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 0.85rem;
  font-weight: 700;
  text-align: center;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.realtime-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.metric-pill {
  background: var(--bg-secondary);
  border: 1px solid var(--gel-border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}

.metric-pill-label {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.metric-pill-val {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--accent-cyan-deep);
}

/* 章节通用结构 */
.section-wrapper {
  padding: 90px 0;
  position: relative;
}

.section-wrapper-alt {
  background: linear-gradient(180deg, transparent 0%, rgba(6, 182, 212, 0.04) 50%, transparent 100%);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 55px;
}

.section-tag {
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  color: var(--text-indigo);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 核心优势介绍 (3个图文卡片，28px 枕状水凝胶) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
}

.feature-icon-wrapper {
  width: 64px;
  height: 64px;
  border-radius: 20px;
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  border: 1px solid var(--gel-border-subtle);
  box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.8);
  transition: transform var(--transition-gel);
}

.feature-card:hover .feature-icon-wrapper {
  transform: scale(1.12) rotate(6deg);
}

.feature-card-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-indigo);
}

.feature-card-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 18px;
  border-top: 1px dashed var(--gel-border-subtle);
}

.feature-chip {
  font-size: 0.8rem;
  padding: 4px 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-weight: 600;
  border: 1px solid var(--gel-border-subtle);
}

/* 流媒体图卡区 */
.media-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.media-card {
  padding: 28px 22px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.media-brand-icon {
  width: 60px;
  height: 60px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.5rem;
  color: #fff;
  box-shadow: 0 10px 20px -4px rgba(0, 0, 0, 0.2);
}

.media-netflix { background: linear-gradient(135deg, #e50914, #b20710); }
.media-disney { background: linear-gradient(135deg, #113ccf, #0c2075); }
.media-youtube { background: linear-gradient(135deg, #ff0000, #c40000); }
.media-hbo { background: linear-gradient(135deg, #5c16c5, #35087a); }

.media-name {
  font-weight: 800;
  font-size: 1.1rem;
}

.media-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.media-tag-badge {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-green);
}

/* AI 支持图卡区 */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.ai-card {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ai-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ai-logo-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
}

.ai-chatgpt { background: #10a37f; }
.ai-claude { background: #d97706; }
.ai-midjourney { background: #2563eb; }
.ai-gemini { background: #4f46e5; }

.ai-title {
  font-size: 1.15rem;
  font-weight: 800;
}

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

.ai-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.ai-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-list li svg {
  color: var(--accent-cyan-deep);
  flex-shrink: 0;
}

/* 套餐价格对比区 (真实套餐参考：免费试用/月付12/年付108/季付30) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
  padding-top: 20px; /* 预留顶部悬浮推荐徽章溢出空间 */
}

.pricing-card {
  padding: 42px 32px 36px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: visible !important; /* 防止顶部推荐标签被裁切 */
}

.pricing-card-popular {
  border: 2px solid var(--accent-cyan);
  background: var(--gel-surface-elevated);
  box-shadow: var(--gel-shadow-lg), 0 0 35px var(--accent-cyan-glow);
  transform: scale(1.03);
  z-index: 2;
  overflow: visible !important;
}

.pricing-card-popular:hover {
  transform: scale(1.05) translateY(-4px);
}

.popular-banner {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-fluid-gradient);
  color: #fff;
  font-size: 0.84rem;
  font-weight: 800;
  padding: 6px 22px;
  border-radius: var(--radius-pill);
  box-shadow: 0 6px 18px var(--accent-cyan-glow);
  letter-spacing: 0.04em;
  white-space: nowrap;
  z-index: 10;
  border: 1.5px solid rgba(255, 255, 255, 0.7);
  box-sizing: border-box;
}

.plan-title {
  font-size: 1.4rem;
  font-weight: 900;
  margin-bottom: 6px;
  color: var(--text-indigo);
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  min-height: 44px;
  margin-bottom: 20px;
}

.plan-price-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 22px;
  padding-bottom: 22px;
  border-bottom: 1px dashed var(--gel-border-subtle);
}

.plan-currency {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--accent-cyan-deep);
}

.plan-price-num {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-indigo);
}

.plan-cycle {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.plan-specs {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-spec-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-secondary);
}

.plan-spec-item svg {
  color: var(--accent-cyan-deep);
  flex-shrink: 0;
}

.pricing-cta-btn {
  width: 100%;
  padding: 14px;
  font-size: 1.02rem;
}

/* 更多轻量套餐小横幅提示 */
.pricing-extra-note {
  margin-top: 36px;
  padding: 18px 24px;
  background: var(--gel-surface);
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--gel-border);
  box-shadow: var(--gel-shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

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

.review-card {
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.review-text {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px dashed var(--gel-border-subtle);
}

.author-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.15rem;
}

/* 常见问题 (FAQ) */
.faq-grid {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.faq-item {
  background: var(--gel-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1.5px solid var(--gel-border);
  border-radius: var(--radius-inner);
  overflow: hidden;
  box-shadow: var(--gel-shadow-sm), var(--gel-rim-highlight);
  transition: all var(--transition-gel);
}

.faq-item[open] {
  border-color: var(--accent-cyan);
  box-shadow: var(--gel-shadow-md);
}

.faq-question {
  padding: 22px 26px;
  font-size: 1.08rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  color: var(--text-indigo);
}

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

.faq-arrow {
  width: 22px;
  height: 22px;
  color: var(--accent-cyan-deep);
  transition: transform 0.3s var(--elastic-bounce);
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 26px 24px;
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.75;
  border-top: 1px dashed var(--gel-border-subtle);
  padding-top: 14px;
}

/* 页面底部行动横幅 */
.final-cta-section {
  margin: 40px auto 0;
  padding: 60px 40px;
  text-align: center;
  background: var(--gel-surface);
  border-radius: var(--radius-gel);
  border: 1.5px solid var(--gel-border);
  box-shadow: var(--gel-shadow-lg), var(--gel-rim-highlight);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

/* 页脚 Footer 规范 (严格只保留四个标题，在新页面打开) */
.footer {
  margin-top: 80px;
  background: var(--gel-surface);
  border-top: 1.5px solid var(--gel-border);
  padding: 55px 0 40px;
  position: relative;
  z-index: 1;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.footer-nav-link {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  transition: all var(--transition-gel);
}

.footer-nav-link:hover {
  color: var(--accent-cyan-deep);
  background: rgba(6, 182, 212, 0.1);
  transform: translateY(-2px);
}

.footer-copyright {
  text-align: center;
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 独立子页面通用样式 */
.subpage-container {
  max-width: 900px;
  margin: 36px auto 80px;
  padding: 0 24px;
}

.subpage-card {
  padding: 48px;
}

.subpage-header {
  margin-bottom: 32px;
  padding-bottom: 22px;
  border-bottom: 1px dashed var(--gel-border-subtle);
}

.subpage-title {
  font-size: 2.25rem;
  font-weight: 900;
  color: var(--text-indigo);
  margin-bottom: 8px;
}

.subpage-updated {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.subpage-content h2 {
  font-size: 1.45rem;
  font-weight: 800;
  margin: 32px 0 14px;
  color: var(--text-indigo);
  display: flex;
  align-items: center;
  gap: 10px;
}

.subpage-content h2::before {
  content: '';
  width: 5px;
  height: 22px;
  background: var(--accent-fluid-gradient);
  border-radius: var(--radius-pill);
  display: inline-block;
}

.subpage-content p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.subpage-content ul, .subpage-content ol {
  margin: 12px 0 20px 24px;
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.75;
}

.subpage-content li {
  margin-bottom: 8px;
  list-style: disc;
}

.highlight-box {
  background: rgba(6, 182, 212, 0.08);
  border: 1.5px solid var(--gel-border-subtle);
  border-radius: var(--radius-inner);
  padding: 22px;
  margin: 22px 0;
  color: var(--text-primary);
}

.subpage-back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-cyan-deep);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 22px;
}

.subpage-back-link:hover {
  text-decoration: underline;
}

/* 响应式适配 (@media 移动端完美单栏) */
@media (max-width: 1080px) {
  .nav-menu {
    display: none; /* 移动端隐藏中间长目录，保留品牌、昼夜开关与直达 CTA */
  }

  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-subtitle {
    margin: 0 auto;
  }

  .hero-ctas {
    justify-content: center;
  }

  .hero-trust-bar {
    justify-content: center;
  }

  .features-grid, .pricing-grid, .reviews-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }

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

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

@media (max-width: 768px) {
  .header {
    top: 8px;
    padding: 0 10px;
  }

  .nav-wrapper {
    height: 60px;
    padding: 0 16px;
  }

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

  .hero-subtitle {
    font-size: 1.02rem;
  }

  .hero-ctas {
    flex-direction: column;
    width: 100%;
  }

  .hero-ctas .btn {
    width: 100%;
  }

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

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .subpage-card {
    padding: 24px 18px;
    border-radius: 20px;
  }

  .subpage-title {
    font-size: 1.8rem;
  }

  .pricing-extra-note {
    flex-direction: column;
    text-align: center;
    border-radius: 20px;
  }
}

/* ===================================================================
   深度 SEO 长篇文章专属样式 (TOC目录、FAQ模块、相关阅读、内链引导)
   =================================================================== */
.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px dashed var(--gel-border-subtle);
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.article-breadcrumb a {
  color: var(--accent-cyan-deep);
  font-weight: 600;
}

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

.article-main-title {
  font-size: 2.35rem;
  font-weight: 900;
  color: var(--text-indigo);
  line-height: 1.35;
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

/* 目录模块 (Table of Contents - TOC) */
.article-toc {
  background: var(--bg-secondary);
  border: 1.5px solid var(--gel-border-subtle);
  border-radius: var(--radius-inner);
  padding: 24px 28px;
  margin: 32px 0 40px;
  box-shadow: var(--gel-shadow-sm);
}

.article-toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-indigo);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding-left: 0;
}

.article-toc-item {
  list-style: none;
  margin: 0;
}

.article-toc-item a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

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

.article-toc-sublist {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 8px 0 4px 22px;
  padding-left: 0;
}

.article-toc-subitem {
  list-style: none;
  margin: 0;
}

.article-toc-subitem a {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
}

.article-toc-subitem a:hover {
  color: var(--accent-cyan-deep);
}

/* 正文排版 */
.article-body h2 {
  font-size: 1.65rem;
  font-weight: 900;
  color: var(--text-indigo);
  margin: 44px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1.5px solid var(--gel-border-subtle);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h2::before {
  content: '';
  width: 6px;
  height: 24px;
  background: var(--accent-fluid-gradient);
  border-radius: var(--radius-pill);
  display: inline-block;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-indigo);
  margin: 28px 0 12px;
}

.article-body p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 18px;
}

.article-body ul, .article-body ol {
  margin: 14px 0 24px 24px;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
}

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

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

.article-body a.seo-inlink {
  color: var(--accent-cyan-deep);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color var(--transition-fast);
}

.article-body a.seo-inlink:hover {
  color: var(--accent-cyan);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95rem;
}

.article-table th {
  background: rgba(6, 182, 212, 0.12);
  color: var(--text-indigo);
  font-weight: 800;
  text-align: left;
  padding: 14px 16px;
  border: 1px solid var(--gel-border-subtle);
}

.article-table td {
  padding: 12px 16px;
  border: 1px solid var(--gel-border-subtle);
  color: var(--text-secondary);
}

.article-table tr:nth-child(even) {
  background: var(--bg-secondary);
}

/* 文章底部 FAQ 专属容器 */
.article-faq-section {
  margin: 50px 0 36px;
  padding: 36px 30px;
  background: var(--bg-secondary);
  border: 1.5px solid var(--gel-border-subtle);
  border-radius: var(--radius-inner);
}

.article-faq-title {
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--text-indigo);
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 文章底部 相关阅读 (Related Articles) */
.article-related-section {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px dashed var(--gel-border-subtle);
}

.article-related-title {
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--text-indigo);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.related-card {
  background: var(--gel-surface);
  border: 1.5px solid var(--gel-border);
  border-radius: var(--radius-inner);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--gel-shadow-sm);
  transition: transform var(--transition-gel), box-shadow var(--transition-gel);
}

.related-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--gel-shadow-md);
  border-color: var(--accent-cyan);
}

.related-card-tag {
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--accent-cyan-deep);
  background: rgba(6, 182, 212, 0.12);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  align-self: flex-start;
}

.related-card-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-indigo);
  line-height: 1.45;
}

@media (max-width: 768px) {
  .article-main-title {
    font-size: 1.75rem;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .article-toc {
    padding: 18px;
  }
  .article-faq-section {
    padding: 20px 16px;
  }
}