/* ==========================================================================
   哆啦 A 梦 (Doraemon Cloud) - 官方推广落地页样式表
   Pop-Modern Palette:
     - 经典哆啦天蓝 Azure Blue: #009fe8
     - 任意门粉 Cherry-Blossom Pink: #ff4081
     - 铜铃金 Brass Bell Gold: #ffd000
     - 极净白 Cloud White: #ffffff
   ========================================================================== */

/* --------------------------------------------------------------------------
   设计系统与主题变量 (CSS Variables)
   -------------------------------------------------------------------------- */
:root {
  /* 基础色彩 - 默认日间明亮模式 (Light Mode) */
  --bg-body: #f4f8fc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-surface-subtle: #eef5fb;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --bg-glass-card: rgba(255, 255, 255, 0.75);

  --border-color: #e1ebf4;
  --border-subtle: #edf3f8;
  --border-focus: #009fe8;

  --text-primary: #0a192f;
  --text-secondary: #334e68;
  --text-muted: #627d98;
  --text-light: #9fb3c8;

  /* 哆啦 A 梦 专属高对比潮流波普调色盘 */
  --doraemon-blue: #009fe8;
  --doraemon-blue-hover: #0084c2;
  --doraemon-blue-light: #e0f4ff;

  --portal-pink: #ff4081;
  --portal-pink-hover: #f50057;
  --portal-pink-light: #ffe6ef;

  --bell-gold: #ffd000;
  --bell-gold-hover: #f5c400;
  --bell-gold-light: #fff9d6;

  --cloud-white: #ffffff;
  --success: #10b981;

  /* 核心渐变 */
  --gradient-doraemon: linear-gradient(135deg, #009fe8 0%, #0077c2 100%);
  --gradient-portal: linear-gradient(135deg, #ff4081 0%, #009fe8 100%);
  --gradient-conduit: linear-gradient(135deg, #ff4081 0%, #ffd000 50%, #009fe8 100%);
  --gradient-bell: linear-gradient(135deg, #ffd000 0%, #ffab00 100%);

  /* 阴影层次与光晕 */
  --shadow-sm: 0 2px 4px rgba(0, 79, 133, 0.05);
  --shadow-md: 0 6px 16px -2px rgba(0, 79, 133, 0.08), 0 2px 6px -1px rgba(0, 79, 133, 0.04);
  --shadow-lg: 0 14px 30px -4px rgba(0, 79, 133, 0.12), 0 6px 12px -3px rgba(0, 79, 133, 0.06);
  --shadow-xl: 0 24px 48px -6px rgba(0, 79, 133, 0.16);
  --shadow-portal: 0 0 35px rgba(255, 64, 129, 0.35);
  --shadow-blue: 0 0 30px rgba(0, 159, 232, 0.3);

  /* 尺寸与布局 */
  --header-height: 74px;
  --max-width: 1220px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* 动画平滑过渡 */
  --transition-fast: 0.18s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --theme-transition: background-color 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                      color 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                      border-color 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                      box-shadow 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   暗黑夜间模式 (Dark Mode)
   -------------------------------------------------------------------------- */
[data-theme="dark"] {
  --bg-body: #070d18;
  --bg-surface: #0e1726;
  --bg-surface-elevated: #142136;
  --bg-surface-subtle: #0b1322;
  --bg-card: #0f192b;
  --bg-glass: rgba(14, 23, 38, 0.88);
  --bg-glass-card: rgba(15, 25, 43, 0.75);

  --border-color: #1a2a44;
  --border-subtle: #132035;
  --border-focus: #009fe8;

  --text-primary: #f0f7ff;
  --text-secondary: #bcccdc;
  --text-muted: #829ab1;
  --text-light: #486581;

  --doraemon-blue: #38bdf8;
  --doraemon-blue-hover: #0ea5e9;
  --doraemon-blue-light: rgba(56, 189, 248, 0.15);

  --portal-pink: #ff5c93;
  --portal-pink-hover: #ff4081;
  --portal-pink-light: rgba(255, 92, 147, 0.15);

  --bell-gold: #ffdb33;
  --bell-gold-hover: #ffd000;
  --bell-gold-light: rgba(255, 219, 51, 0.15);

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.7);
  --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.85);
  --shadow-portal: 0 0 45px rgba(255, 92, 147, 0.4);
  --shadow-blue: 0 0 35px rgba(56, 189, 248, 0.35);
}

/* --------------------------------------------------------------------------
   基础重置与全局平滑滚动
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth; /* 点击锚点平滑过渡动画 */
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.65;
  transition: var(--theme-transition);
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* --------------------------------------------------------------------------
   顶部导航栏 (Navbar)
   -------------------------------------------------------------------------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--theme-transition);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

/* 哆啦 A 梦专属品牌图像 Logo (带潮流圆形质感与微动效) */
.brand-logo-wrap {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border: 2px solid var(--doraemon-blue);
  box-shadow: 0 4px 12px rgba(0, 159, 232, 0.25);
  flex-shrink: 0;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.brand-logo:hover .brand-logo-wrap {
  transform: scale(1.08) rotate(-4deg);
  border-color: var(--portal-pink);
  box-shadow: 0 6px 18px rgba(255, 64, 129, 0.35);
}

.brand-logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 哆啦 A 梦专属小铃铛 + 任意门徽章 (备用) */
.brand-bell-badge {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--gradient-doraemon);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: 0 4px 14px rgba(0, 159, 232, 0.35);
  flex-shrink: 0;
}

.brand-bell-icon {
  width: 22px;
  height: 22px;
  color: var(--bell-gold);
}

.brand-title-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--text-primary);
}

.brand-sub {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--portal-pink);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* 导航目录 (首页 + 每个锚点 + 推荐资讯) */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 2px;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--doraemon-blue);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2.5px;
  background: var(--gradient-portal);
  transition: width var(--transition-normal);
  border-radius: 4px;
}

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

/* 推荐资讯特别高亮徽章入口 */
.nav-link-news {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--portal-pink) !important;
  font-weight: 700;
}

.news-dot-badge {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--portal-pink);
  box-shadow: 0 0 8px var(--portal-pink);
  animation: pulse-dot 1.8s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

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

/* --------------------------------------------------------------------------
   精细专业半透明 昼夜模式切换开关
   -------------------------------------------------------------------------- */
.theme-toggle-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: rgba(0, 159, 232, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
}

.theme-toggle-btn:hover {
  background: rgba(0, 159, 232, 0.16);
  border-color: var(--doraemon-blue);
  color: var(--doraemon-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 159, 232, 0.2);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.theme-toggle-btn .icon-sun {
  display: block;
}
.theme-toggle-btn .icon-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle-btn .icon-sun {
  display: none;
}
[data-theme="dark"] .theme-toggle-btn .icon-moon {
  display: block;
}

/* --------------------------------------------------------------------------
   通用按钮规范 (CTA Buttons)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.96rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  white-space: nowrap;
  min-height: 46px; /* 触控手指友好尺寸 */
}

.btn-primary {
  background: var(--gradient-portal);
  color: #ffffff !important;
  box-shadow: 0 6px 18px rgba(255, 64, 129, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.25);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(255, 64, 129, 0.45);
  filter: brightness(1.06);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-secondary:hover {
  border-color: var(--doraemon-blue);
  color: var(--doraemon-blue);
  background-color: var(--bg-surface-subtle);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.08rem;
  border-radius: var(--radius-lg);
  min-height: 52px;
}

.btn-block {
  width: 100%;
}

/* --------------------------------------------------------------------------
   主视觉区 (Hero Section) & 任意门空间交互
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 68px 0 80px;
  position: relative;
  overflow: hidden;
  text-align: center;
}

/* 任意门空间粒子与光晕背景 */
.hero-portal-glow {
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 64, 129, 0.15) 0%, rgba(0, 159, 232, 0.12) 45%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  filter: blur(60px);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 920px;
  margin: 0 auto;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 22px;
  color: var(--text-secondary);
}

.hero-pill-badge .bell-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--bell-gold);
  box-shadow: 0 0 10px var(--bell-gold);
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.18;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero-title .brand-accent {
  background: var(--gradient-doraemon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-title .portal-accent {
  background: var(--gradient-portal);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

/* ==========================================================================
   3D 任意门空间展台与维度折叠交互 (Interactive 3D Anywhere Door)
   ========================================================================== */
.portal-stage {
  margin: 40px auto 20px;
  max-width: 1040px;
  position: relative;
  z-index: 5;
  padding: 30px 20px;
}

.portal-spatial-layout {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  position: relative;
}

/* 浮动无边框磨砂玻璃指标卡片 (Floating Frosted-Glass Cards) */
.portal-metric-card {
  width: 250px;
  background: var(--bg-glass-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 24px 20px;
  box-shadow: var(--shadow-lg);
  text-align: left;
  transition: all var(--transition-normal);
  z-index: 6;
}

.portal-metric-card:hover {
  transform: translateY(-6px);
  border-color: var(--doraemon-blue);
  box-shadow: var(--shadow-xl), var(--shadow-blue);
}

.metric-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.metric-badge.pink {
  background-color: var(--portal-pink-light);
  color: var(--portal-pink);
}

.metric-badge.blue {
  background-color: var(--doraemon-blue-light);
  color: var(--doraemon-blue);
}

.metric-value {
  font-size: 2.1rem;
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.metric-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* 3D 任意门实体架构 (The Anywhere Door Frame & Leaf) */
.door-container-3d {
  width: 270px;
  height: 380px;
  perspective: 1200px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* 任意门经典粉色外门框 */
.door-frame {
  width: 100%;
  height: 100%;
  border-radius: 20px 20px 4px 4px;
  border: 14px solid var(--portal-pink);
  box-shadow: 0 16px 40px rgba(255, 64, 129, 0.4), inset 0 2px 6px rgba(255, 255, 255, 0.6);
  position: relative;
  background-color: #0b1329;
  overflow: hidden;
  transform-style: preserve-3d;
}

/* 门槛底座 */
.door-threshold-base {
  position: absolute;
  bottom: -14px;
  left: -20px;
  right: -20px;
  height: 14px;
  background: linear-gradient(180deg, #d81b60 0%, #ad1457 100%);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* 门内维度折叠空间与真实等距城市天际线 (Isometric Cityscape in Threshold) */
.door-portal-inside {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding: 16px 14px 18px 38px;
  color: #ffffff;
  overflow: hidden;
  background-size: cover;
  background-position: center bottom;
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* 空间透光光晕着色器 (Spatial Light-Bleed Shaders) */
.door-light-bleed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 40%, rgba(255, 208, 0, 0.25) 0%, rgba(0, 159, 232, 0.3) 50%, rgba(255, 64, 129, 0.4) 100%);
  pointer-events: none;
  mix-blend-mode: screen;
}

.portal-city-info {
  position: relative;
  z-index: 2;
  text-align: center;
  background: rgba(10, 20, 40, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.2);
  margin-bottom: 12px;
  width: 100%;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.portal-city-name {
  font-size: 1.05rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.portal-city-ping {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--bell-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  margin-top: 3px;
  white-space: nowrap;
}

.portal-city-ping .pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bell-gold);
  box-shadow: 0 0 8px var(--bell-gold);
}

/* 任意门门扇 (The 3D Swinging Door Leaf) */
.door-leaf {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #ff4081 0%, #e91e63 100%);
  transform-origin: left center;
  transform-style: preserve-3d;
  transition: transform 0.85s cubic-bezier(0.2, 0.9, 0.2, 1);
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.15), 4px 0 16px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 22px;
  z-index: 10;
  cursor: pointer;
}

/* 任意门门上的方形凹凸经典饰面 */
.door-panel-decor {
  position: absolute;
  top: 24px;
  left: 20px;
  right: 20px;
  height: 130px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 8px;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.1);
}

.door-panel-decor.lower {
  top: 180px;
  height: 140px;
}

/* 铜铃金门把手 (Brass Bell Gold Doorknob) */
.door-knob {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gradient-bell);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.35), inset 0 2px 4px rgba(255, 255, 255, 0.8);
  position: relative;
  z-index: 12;
}

/* 门微启与完全开启状态 (Door Swings open on Z/Y Axis) */
.door-container-3d.door-open .door-leaf {
  transform: rotateY(-82deg);
}

/* 城市目的地选择开关 (Dimensional folding destination toggle pills) */
.destination-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.dest-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dest-pill:hover {
  border-color: var(--portal-pink);
  color: var(--portal-pink);
  transform: translateY(-2px);
}

.dest-pill.active {
  background: var(--gradient-portal);
  border-color: transparent;
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(255, 64, 129, 0.4);
}

.dest-pill .ping-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--bell-gold);
}

/* --------------------------------------------------------------------------
   区块公共标题 (Section Headers)
   -------------------------------------------------------------------------- */
.section {
  padding: 96px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-surface-subtle);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--portal-pink);
  background-color: var(--portal-pink-light);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.12rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   产品核心优势卡片 (3 Cards)
   -------------------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 38px 30px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--doraemon-blue);
}

.feature-icon-wrapper {
  width: 62px;
  height: 62px;
  border-radius: var(--radius-lg);
  background: var(--doraemon-blue-light);
  color: var(--doraemon-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: transform var(--transition-fast);
}

.feature-card:hover .feature-icon-wrapper {
  transform: scale(1.1);
  background: var(--gradient-doraemon);
  color: #ffffff;
}

.feature-icon-wrapper svg {
  width: 32px;
  height: 32px;
}

.feature-title {
  font-size: 1.38rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.feature-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  padding-top: 18px;
  border-top: 1px dashed var(--border-color);
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 9px;
}

.feature-list li:last-child {
  margin-bottom: 0;
}

.feature-list li svg {
  width: 17px;
  height: 17px;
  color: var(--doraemon-blue);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   流媒体解锁 & AI 支持图卡 (Streaming & AI Showcase)
   -------------------------------------------------------------------------- */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 42px 36px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.showcase-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.showcase-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.showcase-card.streaming .showcase-badge {
  background: var(--portal-pink-light);
  color: var(--portal-pink);
}

.showcase-card.ai .showcase-badge {
  background: var(--doraemon-blue-light);
  color: var(--doraemon-blue);
}

.showcase-title {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.showcase-desc {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 30px;
}

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 30px;
}

.platform-pill {
  background-color: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 6px;
  text-align: center;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  transition: var(--transition-fast);
}

.platform-pill:hover {
  border-color: var(--portal-pink);
  background-color: var(--bg-surface);
  transform: translateY(-3px);
}

.platform-pill .tag {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
}

.showcase-specs {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.spec-item svg {
  width: 18px;
  height: 18px;
  color: var(--doraemon-blue);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   套餐价格对比表 (Pricing Section)
   参考网上真实机场/专线主流行情 (¥15.9/月 - ¥158/年 - ¥288/两年)
   微交互：悬浮时卡片边框化作粉蓝渐变光感管道 (smooth pink-to-blue gradient conduits)
   -------------------------------------------------------------------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 42px 34px;
  box-shadow: var(--shadow-md);
  position: relative;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  z-index: 1;
}

/* 粉蓝渐变光感导管微交互 (Gradient Conduit Effect on Hover) */
.pricing-card::before {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: var(--gradient-conduit);
  border-radius: calc(var(--radius-xl) + 2px);
  z-index: -1;
  opacity: 0;
  transition: opacity 0.4s ease, filter 0.4s ease;
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: transparent;
  box-shadow: 0 16px 40px rgba(255, 64, 129, 0.22), 0 8px 24px rgba(0, 159, 232, 0.18);
}

.pricing-card:hover::before {
  opacity: 1;
  filter: blur(1px);
}

/* 热卖推荐卡片高亮 */
.pricing-card.featured {
  border-color: var(--portal-pink);
  box-shadow: 0 0 0 2px var(--portal-pink), var(--shadow-xl);
  background: var(--bg-surface-elevated);
}

.pricing-card.featured::before {
  opacity: 0.6;
}

.pricing-card.featured:hover::before {
  opacity: 1;
}

.pricing-ribbon {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-portal);
  color: #ffffff;
  padding: 5px 20px;
  font-size: 0.8rem;
  font-weight: 800;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 14px rgba(255, 64, 129, 0.4);
}

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

.pricing-plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.pricing-plan-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin: 18px 0;
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.price-amount {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.price-period {
  font-size: 0.98rem;
  color: var(--text-muted);
  font-weight: 600;
}

.pricing-sub-desc {
  font-size: 0.88rem;
  color: var(--portal-pink);
  font-weight: 700;
  text-align: center;
  margin-bottom: 24px;
}

.pricing-features-list {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
}

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

.pricing-features-list li svg {
  width: 18px;
  height: 18px;
  color: var(--doraemon-blue);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   用户评价 (Testimonials)
   -------------------------------------------------------------------------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.testimonial-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 34px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.testimonial-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--doraemon-blue);
}

.testimonial-stars {
  display: flex;
  gap: 4px;
  color: var(--bell-gold);
  margin-bottom: 18px;
}

.testimonial-stars svg {
  width: 19px;
  height: 19px;
  fill: currentColor;
}

.testimonial-quote {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 24px;
  flex-grow: 1;
  font-style: normal;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
}

.author-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--gradient-portal);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.05rem;
  flex-shrink: 0;
  box-shadow: 0 4px 10px rgba(255, 64, 129, 0.3);
}

.author-info h4 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-primary);
}

.author-info p {
  font-size: 0.84rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   常见问题解答 (FAQ Section)
   -------------------------------------------------------------------------- */
.faq-wrap {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item[open] {
  border-color: var(--doraemon-blue);
}

.faq-summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  user-select: none;
}

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

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--portal-pink);
}

.faq-content {
  padding: 0 28px 24px;
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* --------------------------------------------------------------------------
   底部召唤转化区 (Bottom CTA)
   -------------------------------------------------------------------------- */
.cta-banner {
  background: var(--gradient-portal);
  border-radius: var(--radius-xl);
  padding: 64px 40px;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 45px rgba(255, 64, 129, 0.35);
}

.cta-banner h2 {
  font-size: 2.6rem;
  font-weight: 900;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-banner p {
  font-size: 1.2rem;
  opacity: 0.95;
  max-width: 660px;
  margin: 0 auto 38px;
}

.cta-banner .btn-cta-white {
  background-color: #ffffff;
  color: var(--portal-pink);
  font-weight: 800;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.cta-banner .btn-cta-white:hover {
  background-color: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

/* --------------------------------------------------------------------------
   页脚规范 (Footer - 只保留四个严格规定的标题)
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 36px;
  transition: var(--theme-transition);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  padding: 4px 8px;
}

.footer-link:hover {
  color: var(--doraemon-blue);
}

.footer-bottom {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
}

/* --------------------------------------------------------------------------
   独立子页面排版 (Subpages & 推荐资讯专用卡片网格)
   -------------------------------------------------------------------------- */
.subpage-hero {
  padding: 64px 0 44px;
  text-align: center;
  background-color: var(--bg-surface-subtle);
  border-bottom: 1px solid var(--border-color);
}

.subpage-hero h1 {
  font-size: 2.6rem;
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.subpage-hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
}

.subpage-body {
  padding: 64px 0 96px;
}

.subpage-content {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-sm);
  max-width: 920px;
  margin: 0 auto;
}

.subpage-content h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 36px 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.subpage-content h2:first-child {
  margin-top: 0;
}

.subpage-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 24px 0 12px;
}

.subpage-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
  font-size: 1.02rem;
}

.subpage-content ul, .subpage-content ol {
  padding-left: 24px;
  margin-bottom: 22px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.subpage-content li {
  margin-bottom: 9px;
}

.callout-box {
  background-color: var(--doraemon-blue-light);
  border-left: 4px solid var(--doraemon-blue);
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  margin: 24px 0;
  color: var(--text-primary);
}

.callout-box p {
  margin-bottom: 0;
}

/* 推荐资讯卡片流 */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 36px;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  transform: translateY(-5px);
  border-color: var(--portal-pink);
  box-shadow: var(--shadow-lg);
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.news-tag {
  background: var(--portal-pink-light);
  color: var(--portal-pink);
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.news-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.news-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 20px;
}

.news-read-btn {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--doraemon-blue);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 网站地图专用排版 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.sitemap-box {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.sitemap-box h3 {
  margin-top: 0;
  margin-bottom: 16px;
  color: var(--doraemon-blue);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sitemap-links {
  list-style: none;
  padding: 0;
}

.sitemap-links li {
  margin-bottom: 10px;
}

.sitemap-links a {
  color: var(--text-secondary);
  font-size: 0.96rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sitemap-links a:hover {
  color: var(--portal-pink);
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   深度长篇 SEO 科普文章专用排版系统 (Articles / Guides Layout)
   -------------------------------------------------------------------------- */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

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

.breadcrumbs a:hover {
  color: var(--doraemon-blue);
}

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

.article-header {
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 28px;
}

.article-main-title {
  font-size: 2.35rem;
  font-weight: 900;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

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

.article-tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--portal-pink-light);
  color: var(--portal-pink);
  font-weight: 700;
  font-size: 0.8rem;
}

/* 文章目录 (Table of Contents - TOC) */
.article-toc {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--doraemon-blue);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 32px 0 40px;
}

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

.toc-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toc-list li a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.toc-list li a:hover {
  color: var(--portal-pink);
  transform: translateX(4px);
}

/* 文章正文排版系统 */
.article-body {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-subtle);
  scroll-margin-top: 90px;
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 30px 0 14px;
  scroll-margin-top: 90px;
}

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

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

/* 官方内链高亮样式 */
.internal-link {
  color: var(--doraemon-blue);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.internal-link:hover {
  color: var(--portal-pink);
}

/* 提示卡片 (Callout Box) */
.info-tip-box {
  background: var(--doraemon-blue-light);
  border: 1px solid rgba(0, 159, 232, 0.2);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 28px 0;
  color: var(--text-primary);
}

.info-tip-box.pink {
  background: var(--portal-pink-light);
  border-color: rgba(255, 64, 129, 0.2);
}

.info-tip-title {
  font-weight: 800;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 文章内对比表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.article-table th {
  background: var(--bg-surface-subtle);
  color: var(--text-primary);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 2px solid var(--border-color);
}

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

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

/* 文章内专属 CTA 引导条 */
.article-cta-box {
  background: var(--gradient-portal);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  margin: 48px 0;
  color: #ffffff;
  text-align: center;
  box-shadow: 0 12px 30px rgba(255, 64, 129, 0.28);
}

.article-cta-box h3 {
  color: #ffffff;
  font-size: 1.55rem;
  font-weight: 900;
  margin-bottom: 10px;
}

.article-cta-box p {
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 22px;
}

.article-cta-btn {
  background: #ffffff;
  color: var(--portal-pink);
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
  transition: all var(--transition-fast);
}

.article-cta-btn:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.25);
}

/* 文章专属常见问答板块 (Article FAQ) */
.article-faq-section {
  margin: 50px 0 40px;
  padding-top: 36px;
  border-top: 2px solid var(--border-color);
}

.article-faq-section h2 {
  border-bottom: none;
  margin-top: 0;
  margin-bottom: 24px;
}

/* 相关阅读板块 (Related Reading) */
.related-posts-section {
  margin: 50px 0 20px;
  padding-top: 36px;
  border-top: 2px solid var(--border-color);
}

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

.related-post-card {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.related-post-card:hover {
  border-color: var(--doraemon-blue);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.related-post-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.related-post-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 12px;
  flex-grow: 1;
}

.related-post-link {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--doraemon-blue);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* --------------------------------------------------------------------------
   响应式媒体查询 (@media) - 确保手机端单栏优雅显示
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .portal-spatial-layout {
    flex-direction: column;
    gap: 30px;
  }

  .portal-metric-card {
    width: 100%;
    max-width: 420px;
  }

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

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

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .section {
    padding: 64px 0;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .hero-subtitle {
    font-size: 1.05rem;
    margin-bottom: 28px;
  }

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

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

  .nav-menu {
    display: none; /* 移动端保障超快交互 */
  }

  .door-container-3d {
    width: 240px;
    height: 340px;
  }

  .door-portal-inside {
    padding: 14px 10px 16px 32px;
  }

  .portal-city-name {
    font-size: 0.95rem;
  }

  .portal-city-ping {
    font-size: 0.74rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .showcase-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .showcase-card {
    padding: 28px 20px;
  }

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

  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .subpage-content {
    padding: 24px 18px;
  }

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

  .cta-banner {
    padding: 40px 20px;
  }

  .cta-banner h2 {
    font-size: 1.85rem;
  }
}