/* ===================================================================
   蓝胖云 (lanpangyun.rest) - 霁蓝云瓷温润奢雅原生 CSS
   Design Concept: Cobalt-glazed porcelain & soft-body tactile luxury daylight UI
   Palette:
     - Cloud-frost white: #f7f9fc
     - Translucent sky-cobalt glass: #0284c7 (with ceramic glaze effects)
     - Warm amber-bell indicator dots: #f59e0b
     - Calm midnight-slate typography: #1e293b
   Geometry:
     - Generous 28px rounded corners on modular service cards
     - Specular glazed bevels and diffuse ambient shadows
     - Viscoelastic soft-body micro-interactions (2px compression & spring rebound)
   =================================================================== */

:root {
  /* 白天模式 (Default Daylight Mode) */
  --bg-frost: #f7f9fc;
  --bg-porcelain: #ffffff;
  --bg-porcelain-elevated: #ffffff;
  --bg-porcelain-subtle: #f1f5f9;
  --bg-cobalt-glass: rgba(2, 132, 199, 0.06);
  --bg-glass-card: rgba(255, 255, 255, 0.88);
  --bg-mist: rgba(255, 255, 255, 0.65);

  --border-porcelain: rgba(2, 132, 199, 0.12);
  --border-porcelain-strong: rgba(2, 132, 199, 0.22);
  --border-subtle: #e2e8f0;

  --text-midnight: #1e293b;
  --text-slate: #475569;
  --text-muted: #64748b;
  --text-soft: #94a3b8;

  --cobalt-primary: #0284c7;
  --cobalt-hover: #0369a1;
  --cobalt-light: rgba(2, 132, 199, 0.08);
  --cobalt-glow: rgba(2, 132, 199, 0.22);
  
  --amber-indicator: #f59e0b;
  --amber-glow: rgba(245, 158, 11, 0.45);
  
  --emerald-safe: #10b981;
  --danger-crimson: #ef4444;

  /* 瓷质高光斜切与无感重力悬浮漫反射阴影 */
  --shadow-porcelain-card: 
    inset 0 1.5px 0 0 rgba(255, 255, 255, 0.95),
    0 16px 36px -8px rgba(15, 23, 42, 0.06),
    0 2px 6px -1px rgba(2, 132, 199, 0.04);
    
  --shadow-porcelain-hover: 
    inset 0 1.5px 0 0 rgba(255, 255, 255, 1),
    0 24px 48px -12px rgba(2, 132, 199, 0.14),
    0 8px 18px -4px rgba(15, 23, 42, 0.06);

  --shadow-porcelain-active: 
    inset 0 2px 4px 0 rgba(15, 23, 42, 0.06),
    0 4px 12px -2px rgba(2, 132, 199, 0.08);

  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.03);
  --shadow-header: 0 4px 20px -2px rgba(15, 23, 42, 0.04);

  --radius-card: 28px;
  --radius-pill: 9999px;
  --radius-sm: 10px;
  --radius-md: 16px;

  /* 粘弹性软体微交互缓动曲线 (Viscoelastic Soft-body Rebound) */
  --spring-softbody: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s;

  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --header-height: 76px;
  --container-width: 1200px;
}

/* 深色模式 (Dark Ceramic Midnight) */
[data-theme="dark"] {
  --bg-frost: #090e18;
  --bg-porcelain: #111a2d;
  --bg-porcelain-elevated: #16223b;
  --bg-porcelain-subtle: #1a2640;
  --bg-cobalt-glass: rgba(56, 189, 248, 0.08);
  --bg-glass-card: rgba(17, 26, 45, 0.92);
  --bg-mist: rgba(22, 34, 59, 0.7);

  --border-porcelain: rgba(56, 189, 248, 0.16);
  --border-porcelain-strong: rgba(56, 189, 248, 0.3);
  --border-subtle: #1e2c47;

  --text-midnight: #f8fafc;
  --text-slate: #cbd5e1;
  --text-muted: #94a3b8;
  --text-soft: #64748b;

  --cobalt-primary: #38bdf8;
  --cobalt-hover: #7dd3fc;
  --cobalt-light: rgba(56, 189, 248, 0.12);
  --cobalt-glow: rgba(56, 189, 248, 0.3);

  --shadow-porcelain-card: 
    inset 0 1px 0 0 rgba(255, 255, 255, 0.08),
    0 18px 40px -8px rgba(0, 0, 0, 0.55);

  --shadow-porcelain-hover: 
    inset 0 1px 0 0 rgba(255, 255, 255, 0.15),
    0 24px 50px -10px rgba(56, 189, 248, 0.22);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  background-color: var(--bg-frost);
  color: var(--text-midnight);
  line-height: 1.68;
  transition: background-color var(--transition-normal) var(--ease-smooth), color var(--transition-normal) var(--ease-smooth);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 霁蓝云白呼吸光晕 */
.bg-ambient-porcelain {
  position: fixed;
  top: -160px;
  left: 50%;
  transform: translateX(-50%);
  width: 1080px;
  height: 560px;
  background: radial-gradient(circle, var(--cobalt-glow) 0%, rgba(2, 132, 199, 0.05) 50%, transparent 80%);
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease, opacity 0.25s ease;
}

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

ul, ol {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

/* ===================================================================
   顶部导航栏（瓷釉质感毛玻璃 + 全模块平滑锚点）
   =================================================================== */
.header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--bg-glass-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-porcelain);
  box-shadow: var(--shadow-header);
  z-index: 100;
  transition: background var(--transition-normal) ease, border-color var(--transition-normal) ease;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-midnight);
  letter-spacing: -0.02em;
}

.logo-ceramic-gem {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--cobalt-primary) 0%, #0369a1 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 
    inset 0 1px 1px rgba(255, 255, 255, 0.6),
    0 6px 16px var(--cobalt-glow);
  position: relative;
}

.logo-badge {
  font-size: 0.7rem;
  background: var(--cobalt-light);
  color: var(--cobalt-primary);
  border: 1px solid var(--border-porcelain);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  margin-left: 2px;
}

/* 导航锚点项 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 0.94rem;
  color: var(--text-slate);
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  transition: all 0.25s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--cobalt-primary);
  background: var(--cobalt-light);
}

.nav-link.nav-link-news {
  color: var(--cobalt-primary);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(2, 132, 199, 0.07);
  border: 1px solid var(--border-porcelain);
}

.nav-link.nav-link-news:hover {
  background: var(--cobalt-primary);
  color: #ffffff;
}

.nav-link.nav-link-news .amber-dot {
  width: 6px;
  height: 6px;
  background: var(--amber-indicator);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--amber-glow);
}

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

/* 精致透明化昼夜模式切换按钮 */
.theme-toggle-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  background: var(--bg-mist);
  border: 1px solid var(--border-porcelain);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-slate);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.theme-toggle-btn:hover {
  color: var(--cobalt-primary);
  border-color: var(--cobalt-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px var(--cobalt-glow);
}

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

.theme-icon-sun,
.theme-icon-moon {
  width: 20px;
  height: 20px;
  transition: transform 0.4s var(--spring-softbody), opacity 0.35s ease;
  position: absolute;
}

/* 昼夜图标状态 */
[data-theme="light"] .theme-icon-sun,
:root:not([data-theme="dark"]) .theme-icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.4);
}

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

[data-theme="dark"] .theme-icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: var(--amber-indicator);
}

[data-theme="dark"] .theme-icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.4);
}

.mobile-menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--bg-porcelain-subtle);
  border: 1px solid var(--border-porcelain);
  color: var(--text-midnight);
  align-items: center;
  justify-content: center;
}

/* ===================================================================
   按钮与软体弹性微交互 (Viscoelastic Soft-body Indentation)
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  transition: transform var(--transition-normal) var(--spring-softbody), box-shadow 0.25s ease, background-color 0.25s ease;
  user-select: none;
  -webkit-user-select: none;
}

/* 软体下压 2px 与回弹 (Squish 2px on click/press) */
.btn:active,
.pricing-card:active,
.adv-card:active,
.unlock-card:active,
.app-pill:active {
  transform: scale(0.985) translateY(2px) !important;
  box-shadow: var(--shadow-porcelain-active) !important;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cobalt-primary) 0%, #0369a1 100%);
  color: #ffffff;
  box-shadow: 
    inset 0 1px 1px rgba(255, 255, 255, 0.4),
    0 6px 18px var(--cobalt-glow);
  border: 1px solid rgba(2, 132, 199, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 
    inset 0 1px 1px rgba(255, 255, 255, 0.6),
    0 10px 26px var(--cobalt-glow);
  background: linear-gradient(135deg, #0284c7 0%, #026597 100%);
}

.btn-secondary {
  background: var(--bg-porcelain);
  color: var(--text-midnight);
  border: 1px solid var(--border-porcelain);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--cobalt-primary);
  color: var(--cobalt-primary);
  background: var(--cobalt-light);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.05rem;
}

/* ===================================================================
   主视觉区 (Hero Area)：霁蓝瓷白极简主打 + 简介说明
   =================================================================== */
.hero-section {
  padding: 85px 0 65px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 20px;
  border-radius: var(--radius-pill);
  background: var(--bg-porcelain);
  border: 1px solid var(--border-porcelain);
  color: var(--cobalt-primary);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 26px;
  box-shadow: var(--shadow-porcelain-card);
  white-space: nowrap;
}

/* 暖琥珀风铃指示点 (Warm Amber-bell indicator dot) */
.amber-bell-pip {
  width: 9px;
  height: 9px;
  background-color: var(--amber-indicator);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
  animation: amber-bell-pulse 2.2s infinite;
}

@keyframes amber-bell-pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.6); }
  70% { transform: scale(1); box-shadow: 0 0 0 7px rgba(245, 158, 11, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(245, 158, 11, 0); }
}

.hero-title {
  font-size: 3.35rem;
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.035em;
  margin-bottom: 22px;
  color: var(--text-midnight);
}

.hero-title .brand-accent {
  background: linear-gradient(135deg, var(--cobalt-primary) 0%, #0ea5e9 50%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  padding-bottom: 4px;
}

.hero-brief {
  font-size: 1.2rem;
  color: var(--text-slate);
  max-width: 760px;
  margin: 0 auto 38px;
  line-height: 1.72;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 52px;
}

/* 核心信任指示指标卡片 */
.hero-trust-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 28px;
  background: var(--bg-porcelain);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-porcelain-card);
  transition: all var(--transition-normal) var(--spring-softbody);
}

.trust-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  position: relative;
}

.trust-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 25%;
  height: 50%;
  width: 1px;
  background-color: var(--border-subtle);
}

.trust-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--cobalt-primary);
  line-height: 1.2;
}

.trust-label {
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

/* ===================================================================
   通用区块排版 & 28px 圆角瓷釉质感卡片
   =================================================================== */
.section {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cobalt-primary);
  margin-bottom: 12px;
  background: var(--cobalt-light);
  border: 1px solid var(--border-porcelain);
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--text-midnight);
}

.section-desc {
  font-size: 1.06rem;
  color: var(--text-slate);
  line-height: 1.68;
}

/* 核心优势卡片（3个图文卡片，28px 圆角与瓷釉微斜切） */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.adv-card {
  background: var(--bg-porcelain);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-card);
  padding: 40px 32px;
  box-shadow: var(--shadow-porcelain-card);
  transition: transform var(--transition-normal) var(--spring-softbody), box-shadow var(--transition-normal) ease, border-color var(--transition-normal) ease;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.adv-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--cobalt-primary), #38bdf8);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.adv-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-porcelain-strong);
  box-shadow: var(--shadow-porcelain-hover);
}

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

.adv-icon-box {
  width: 60px;
  height: 60px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: transform var(--transition-normal) var(--spring-softbody);
  background: var(--cobalt-light);
  color: var(--cobalt-primary);
  border: 1px solid var(--border-porcelain);
}

.adv-card:hover .adv-icon-box {
  transform: scale(1.1);
}

.adv-title {
  font-size: 1.38rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-midnight);
}

.adv-desc {
  font-size: 0.98rem;
  color: var(--text-slate);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.adv-points {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 18px;
  border-top: 1px dashed var(--border-subtle);
}

.adv-point {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
}

.adv-point svg {
  color: var(--emerald-safe);
  flex-shrink: 0;
}

/* ===================================================================
   流媒体图卡 & AI 支持图卡（线路悬停雾气消散与暖琥珀金色核验点亮）
   =================================================================== */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.unlock-card {
  background: var(--bg-porcelain);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-card);
  padding: 40px 36px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-porcelain-card);
  transition: transform var(--transition-normal) var(--spring-softbody), box-shadow var(--transition-normal) ease;
  display: flex;
  flex-direction: column;
}

.unlock-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-porcelain-hover);
  border-color: var(--border-porcelain-strong);
}

.unlock-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 18px;
}

.unlock-title-area {
  display: flex;
  align-items: center;
  gap: 16px;
}

.unlock-title-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--cobalt-light);
  color: var(--cobalt-primary);
  border: 1px solid var(--border-porcelain);
}

.unlock-card-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-midnight);
}

.unlock-card-tag {
  font-size: 0.78rem;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  background: var(--cobalt-light);
  color: var(--cobalt-primary);
  border: 1px solid var(--border-porcelain);
  white-space: nowrap;
}

.unlock-desc {
  font-size: 0.98rem;
  color: var(--text-slate);
  line-height: 1.68;
  margin-bottom: 26px;
}

/* 路线/应用徽章网格：毛玻璃薄雾感，悬浮时雾气散去并点亮琥珀金色核验点 */
.app-pills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.app-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-mist);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  transition: all 0.3s var(--spring-softbody);
  position: relative;
  overflow: hidden;
}

.app-pill .amber-pip {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--text-soft);
  transition: all 0.3s ease;
  flex-shrink: 0;
}

/* 悬停微交互：雾气消散，点亮暖琥珀金点 */
.app-pill:hover {
  background: var(--bg-porcelain-elevated);
  border-color: var(--cobalt-primary);
  transform: translateX(4px);
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.1);
}

.app-pill:hover .amber-pip {
  background-color: var(--amber-indicator);
  box-shadow: 0 0 10px var(--amber-glow);
  transform: scale(1.3);
}

.app-pill-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
  background: var(--cobalt-light);
  color: var(--cobalt-primary);
}

.app-pill-info {
  display: flex;
  flex-direction: column;
}

.app-pill-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-midnight);
  line-height: 1.25;
}

.app-pill-status {
  font-size: 0.74rem;
  color: var(--text-muted);
  font-weight: 500;
}

.app-pill:hover .app-pill-status {
  color: var(--cobalt-primary);
}

.unlock-footer {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.unlock-features {
  display: flex;
  align-items: center;
  gap: 16px;
}

.unlock-feature-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.unlock-feature-item svg {
  color: var(--emerald-safe);
}

/* ===================================================================
   参考真实市场行情的套餐价格对比表
   =================================================================== */
.pricing-section {
  background: var(--bg-porcelain-subtle);
  border-top: 1px solid var(--border-porcelain);
  border-bottom: 1px solid var(--border-porcelain);
  transition: background-color var(--transition-normal) ease;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-porcelain);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-card);
  padding: 42px 34px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-normal) var(--spring-softbody), box-shadow var(--transition-normal) ease, border-color 0.25s ease;
  box-shadow: var(--shadow-porcelain-card);
}

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

.pricing-card.popular {
  border-color: var(--cobalt-primary);
  box-shadow: 
    inset 0 1.5px 0 0 rgba(255, 255, 255, 1),
    0 20px 45px -8px var(--cobalt-glow);
  transform: scale(1.025);
  z-index: 2;
}

.pricing-card.popular:hover {
  transform: scale(1.025) translateY(-6px);
}

.popular-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--cobalt-primary) 0%, #0369a1 100%);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 5px 18px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.02em;
  box-shadow: 0 4px 14px var(--cobalt-glow);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  white-space: nowrap;
  word-break: keep-all;
}

.popular-badge .amber-star {
  color: var(--amber-indicator);
  font-size: 0.82rem;
  line-height: 1;
}

.pricing-header {
  text-align: center;
  margin-bottom: 26px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-name {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-midnight);
  margin-bottom: 6px;
}

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

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-top: 16px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-midnight);
}

.price-amount {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-midnight);
  line-height: 1;
}

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

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.pricing-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.94rem;
  color: var(--text-slate);
}

.pricing-feature svg {
  color: var(--emerald-safe);
  flex-shrink: 0;
}

.pricing-feature.disabled {
  color: var(--text-soft);
  text-decoration: line-through;
}

.pricing-feature.disabled svg {
  color: var(--text-soft);
}

.pricing-cta {
  width: 100%;
}

/* ===================================================================
   用户口碑评价 (28px 圆角温润卡片)
   =================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-porcelain);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-card);
  padding: 34px 30px;
  box-shadow: var(--shadow-porcelain-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-normal) var(--spring-softbody), box-shadow 0.3s ease;
}

.review-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-porcelain-hover);
  border-color: var(--border-porcelain-strong);
}

.review-stars {
  display: flex;
  gap: 5px;
  color: var(--amber-indicator);
  margin-bottom: 16px;
  font-size: 1rem;
}

.review-text {
  font-size: 0.96rem;
  color: var(--text-slate);
  line-height: 1.72;
  margin-bottom: 22px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.author-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--cobalt-light);
  color: var(--cobalt-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.05rem;
  border: 2px solid var(--border-porcelain);
}

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-midnight);
}

.author-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===================================================================
   常见问题解答 (FAQ 手风琴)
   =================================================================== */
.faq-section {
  background: var(--bg-porcelain-subtle);
  border-top: 1px solid var(--border-porcelain);
  border-bottom: 1px solid var(--border-porcelain);
  transition: background-color var(--transition-normal) ease;
}

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

.faq-item {
  background: var(--bg-porcelain);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.faq-item:hover {
  border-color: var(--border-porcelain-strong);
}

.faq-question {
  width: 100%;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.06rem;
  font-weight: 600;
  color: var(--text-midnight);
  cursor: pointer;
  background: none;
  border: none;
  transition: color 0.2s ease;
}

.faq-question:hover {
  color: var(--cobalt-primary);
}

.faq-icon {
  width: 22px;
  height: 22px;
  color: var(--text-muted);
  transition: transform 0.35s var(--spring-softbody), color 0.2s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--cobalt-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-smooth), padding 0.35s ease;
  padding: 0 26px;
  font-size: 0.96rem;
  color: var(--text-slate);
  line-height: 1.72;
}

.faq-item.active .faq-answer {
  max-height: 320px;
  padding: 0 26px 24px 26px;
}

/* ===================================================================
   底部行动横幅 (CTA Banner)
   =================================================================== */
.cta-banner {
  margin-top: 65px;
  background: linear-gradient(135deg, #0369a1 0%, var(--cobalt-primary) 60%, #0284c7 100%);
  border-radius: var(--radius-card);
  padding: 52px 40px;
  text-align: center;
  color: #ffffff;
  box-shadow: 
    inset 0 1px 1px rgba(255, 255, 255, 0.4),
    0 24px 50px -12px var(--cobalt-glow);
  position: relative;
  overflow: hidden;
}

.cta-banner h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.cta-banner p {
  font-size: 1.08rem;
  opacity: 0.92;
  max-width: 640px;
  margin: 0 auto 30px;
}

.btn-white {
  background: #ffffff;
  color: #0369a1;
  font-weight: 700;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.18);
}

.btn-white:hover {
  background: #f8fafc;
  color: var(--cobalt-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.22);
}

/* ===================================================================
   页脚（严格只保留四个标题，在新页面打开）
   =================================================================== */
.footer {
  background: var(--bg-porcelain);
  border-top: 1px solid var(--border-porcelain);
  padding: 48px 0 38px;
  transition: background-color var(--transition-normal) ease;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 38px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1.04rem;
  font-weight: 600;
  color: var(--text-slate);
  transition: color 0.25s ease;
  position: relative;
}

.footer-link:hover {
  color: var(--cobalt-primary);
}

.footer-divider {
  color: var(--border-subtle);
  font-size: 0.85rem;
}

.footer-copy {
  text-align: center;
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* ===================================================================
   子页面排版 (关于我们、服务条款、隐私政策、网站地图、推荐资讯)
   =================================================================== */
.subpage-hero {
  padding: 65px 0 44px;
  text-align: center;
  border-bottom: 1px solid var(--border-porcelain);
  background: var(--bg-porcelain-subtle);
}

.subpage-content {
  padding: 55px 0 85px;
}

.subpage-card {
  background: var(--bg-porcelain);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-card);
  padding: 46px 42px;
  box-shadow: var(--shadow-porcelain-card);
  margin-bottom: 34px;
}

.subpage-card h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-midnight);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.subpage-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-midnight);
  margin: 24px 0 12px;
}

.subpage-card p {
  font-size: 1rem;
  color: var(--text-slate);
  line-height: 1.78;
  margin-bottom: 16px;
}

.subpage-card ul {
  list-style: disc;
  margin-left: 24px;
  margin-bottom: 22px;
  color: var(--text-slate);
  line-height: 1.78;
}

.subpage-card li {
  margin-bottom: 10px;
}

.subpage-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 22px;
}

.info-box {
  background: var(--bg-porcelain-subtle);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: transform 0.25s ease;
}

.info-box:hover {
  border-color: var(--cobalt-primary);
}

.info-box h4 {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text-midnight);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 推荐资讯卡片流 */
.article-item {
  border-bottom: 1px solid var(--border-subtle);
  padding: 26px 0;
}

.article-item:first-child {
  padding-top: 0;
}

.article-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.article-tag {
  font-size: 0.78rem;
  color: var(--cobalt-primary);
  background: var(--cobalt-light);
  border: 1px solid var(--border-porcelain);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  display: inline-block;
  margin-bottom: 10px;
}

.article-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-midnight);
  margin-bottom: 8px;
  line-height: 1.4;
}

.article-meta {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 14px;
}

/* ===================================================================
   深度科普文章通用排版 (TOC 目录、文章正文、FAQ 与相关阅读)
   =================================================================== */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

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

.breadcrumbs a:hover {
  color: var(--cobalt-primary);
}

.breadcrumbs span.divider {
  color: var(--border-porcelain);
}

.article-header {
  margin-bottom: 34px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border-porcelain);
}

.article-header h1 {
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-midnight);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

/* 瓷质高光目录导航框 (Table of Contents) */
.toc-box {
  background: var(--bg-porcelain-subtle);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-midnight);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.toc-item a {
  font-size: 0.95rem;
  color: var(--text-slate);
  font-weight: 500;
  transition: color 0.2s ease, transform 0.2s ease;
}

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

.toc-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber-indicator);
  flex-shrink: 0;
}

/* 深度科普正文排版 */
.article-body {
  font-size: 1.04rem;
  color: var(--text-slate);
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-midnight);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-porcelain);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-midnight);
  margin: 28px 0 12px;
}

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

.article-body ul, .article-body ol {
  margin: 16px 0 24px 28px;
}

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

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

.article-body a {
  color: var(--cobalt-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}

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

/* 强调高亮提示框 */
.callout-box {
  background: var(--bg-porcelain-subtle);
  border-left: 4px solid var(--cobalt-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px 24px;
  margin: 28px 0;
  font-size: 0.96rem;
  color: var(--text-slate);
  line-height: 1.75;
}

.callout-box.tip {
  border-left-color: var(--amber-indicator);
  background: rgba(245, 158, 11, 0.06);
}

.callout-box.safe {
  border-left-color: var(--emerald-safe);
  background: rgba(16, 185, 129, 0.06);
}

/* 比较表格排版 */
.data-table-wrapper {
  overflow-x: auto;
  margin: 28px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-porcelain);
  box-shadow: var(--shadow-sm);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
  background: var(--bg-porcelain);
}

.data-table th {
  background: var(--bg-porcelain-subtle);
  padding: 14px 18px;
  font-weight: 700;
  color: var(--text-midnight);
  border-bottom: 1px solid var(--border-porcelain);
  white-space: nowrap;
}

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

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

.data-table tr:hover td {
  background: var(--bg-porcelain-subtle);
}

/* 文章内专属 FAQ 样式 */
.article-faq {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px solid var(--border-porcelain);
}

.article-faq h2 {
  border-bottom: none;
  margin-top: 0;
  padding-bottom: 0;
}

/* 相关阅读区域 */
.related-reading {
  margin-top: 55px;
  padding-top: 40px;
  border-top: 1px solid var(--border-porcelain);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 22px;
}

.related-card {
  background: var(--bg-porcelain);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s var(--spring-softbody), box-shadow 0.25s ease, border-color 0.25s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--cobalt-primary);
  box-shadow: var(--shadow-porcelain-hover);
}

.related-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-midnight);
  margin-bottom: 10px;
  line-height: 1.4;
}

.related-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

@media (max-width: 768px) {
  .article-header h1 {
    font-size: 1.8rem;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .data-table th, .data-table td {
    padding: 10px 12px;
    font-size: 0.86rem;
  }
}

/* ===================================================================
   响应式媒体查询 (@media)
   =================================================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.75rem;
  }
  
  .advantages-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card.popular {
    transform: none;
  }
  .pricing-card.popular:hover {
    transform: translateY(-6px);
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 66px;
    --radius-card: 22px;
  }

  .header-container {
    position: relative;
  }

  .nav-links {
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--bg-porcelain);
    border-bottom: 1px solid var(--border-porcelain);
    flex-direction: column;
    padding: 20px 24px;
    gap: 14px;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.1);
    display: none;
  }

  .nav-links.active {
    display: flex;
  }

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

  .hero-section {
    padding: 55px 0 42px;
  }

  .hero-title {
    font-size: 2.2rem;
    line-height: 1.25;
  }

  .hero-brief {
    font-size: 1.05rem;
  }

  .hero-cta-group {
    flex-direction: column;
    gap: 14px;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
    min-height: 50px;
  }

  .hero-trust-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 20px 16px;
  }

  .trust-item:not(:last-child)::after {
    display: none;
  }

  .section {
    padding: 55px 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .advantages-grid,
  .pricing-grid,
  .reviews-grid,
  .subpage-grid-2 {
    grid-template-columns: 1fr;
  }

  .app-pills-grid {
    grid-template-columns: 1fr;
  }

  .cta-banner {
    padding: 36px 22px;
  }

  .cta-banner h3 {
    font-size: 1.6rem;
  }

  .footer-nav {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    text-align: center;
    gap: 18px;
  }

  .footer-divider {
    display: none;
  }

  .popular-badge {
    font-size: 0.74rem;
    padding: 4px 14px;
    white-space: nowrap;
  }

  .subpage-card {
    padding: 30px 22px;
  }
}