/* ===================================================================
   哆啦 A 梦 (duolaameng.sbs) - 4D 次元口袋极简奢华 UI 系统
   Palette: Porcelain White (#f8fafc) · Doraemon Cobalt Blue (#0284c7) · Warm Brass Bell (#f59e0b)
   Zero Generic AI Figures · Concentric Pocket Architecture · Dimensional Drawer Micro-Interactions
   =================================================================== */

:root {
  /* 4D 概念色谱（白天模式 · 默认） */
  --bg-porcelain: #f8fafc;
  --bg-plane: #ffffff;
  --bg-subtle: #f0f6fc;
  --bg-glass: rgba(248, 250, 252, 0.88);

  /* 品牌核心色彩体系 */
  --cobalt-doraemon: #0284c7;        /* 经典多啦钴蓝 */
  --cobalt-deep: #0369a1;            /* 深海沉稳蓝 */
  --cobalt-glow: rgba(2, 132, 199, 0.14);
  --cobalt-surface: #e0f2fe;

  --brass-bell: #f59e0b;             /* 暖金铜铃色 */
  --brass-hover: #d97706;
  --brass-light: #fef3c7;
  --brass-glow: rgba(245, 158, 11, 0.22);

  /* 空间排版与质感文本 */
  --text-primary: #091e42;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-on-cobalt: #ffffff;

  /* 几何发丝边界 (Fine Hairlines) 与次元接缝 (Crescent Seams) */
  --hairline: #e2e8f0;
  --hairline-focus: #0284c7;
  --hairline-crescent: rgba(2, 132, 199, 0.22);
  --seam-glow: rgba(2, 132, 199, 0.08);

  /* 极简奢华阴影系统 (Seamless Spatial Elevation) */
  --shadow-drawer: 0 4px 20px -2px rgba(9, 30, 66, 0.06), 0 2px 6px -1px rgba(9, 30, 66, 0.04);
  --shadow-drawer-hover: 0 24px 48px -12px rgba(2, 132, 199, 0.18), 0 8px 16px -4px rgba(9, 30, 66, 0.06);
  --shadow-brass: 0 4px 16px rgba(245, 158, 11, 0.3);
  --shadow-pocket: 0 12px 36px -8px rgba(2, 132, 199, 0.12);

  /* 4D 次元口袋几何圆弧 (Iconic Crescent Radii) */
  --radius-crescent-sm: 14px;
  --radius-crescent-md: 20px;
  --radius-pocket: 28px 28px 48px 48px;  /* 经典半月口袋轮廓 */
  --radius-pocket-inverted: 48px 48px 28px 28px;
  --radius-full: 9999px;

  /* 物理弹簧阻尼微动效 */
  --spring-drawer: 0.42s cubic-bezier(0.16, 1, 0.3, 1);
  --spring-press: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.3s ease;
}

/* 4D 璀璨深空深色模式 (Galactic Cobalt Night) */
[data-theme="dark"] {
  --bg-porcelain: #070d18;
  --bg-plane: #0e1726;
  --bg-subtle: #131f33;
  --bg-glass: rgba(7, 13, 24, 0.9);

  --cobalt-doraemon: #38bdf8;
  --cobalt-deep: #0ea5e9;
  --cobalt-glow: rgba(56, 189, 248, 0.2);
  --cobalt-surface: rgba(56, 189, 248, 0.12);

  --brass-bell: #fbbf24;
  --brass-hover: #f59e0b;
  --brass-light: rgba(251, 191, 36, 0.15);
  --brass-glow: rgba(251, 191, 36, 0.3);

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-on-cobalt: #070d18;

  --hairline: #1e293b;
  --hairline-focus: #38bdf8;
  --hairline-crescent: rgba(56, 189, 248, 0.35);
  --seam-glow: rgba(56, 189, 248, 0.15);

  --shadow-drawer: 0 4px 24px -2px rgba(0, 0, 0, 0.5);
  --shadow-drawer-hover: 0 24px 50px -10px rgba(56, 189, 248, 0.25), 0 8px 20px rgba(0, 0, 0, 0.4);
  --shadow-brass: 0 4px 20px rgba(251, 191, 36, 0.28);
  --shadow-pocket: 0 12px 40px -8px rgba(0, 0, 0, 0.7);
}

/* 全局重置与平滑滚动锚点 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-porcelain);
  color: var(--text-primary);
  line-height: 1.68;
  overflow-x: hidden;
  min-height: 100vh;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

/* 锚点滚动间距补偿，防止被吸顶导航遮挡 */
section[id], div[id] {
  scroll-margin-top: 86px;
}

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

ul {
  list-style: none;
}

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

/* 容器架构与负空间呼吸律动 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ===================================================================
   页眉导航 (Header & Navigation)
   包含首页 + 核心板块锚点 + “推荐资讯” 独立入口
   =================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--hairline);
  transition: all var(--transition-smooth);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}

/* 品牌 Logo 形象 */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  transition: transform var(--spring-press);
  filter: drop-shadow(0 2px 8px var(--cobalt-glow));
  flex-shrink: 0;
}

.logo:hover .logo-img {
  transform: translateY(-2px) scale(1.08) rotate(-4deg);
}

/* 导航主菜单 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  position: relative;
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 8px 6px;
  transition: color var(--spring-press);
}

/* 锚点过渡下划线光标动效 */
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 18px;
  height: 2.5px;
  border-radius: var(--radius-full);
  background: var(--cobalt-doraemon);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  transform: translateX(-50%) scaleX(1);
}

/* 特别突出：“推荐资讯” 专属微胶囊徽章入口 */
.nav-link-news {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--brass-light);
  color: var(--brass-hover);
  border-radius: var(--radius-full);
  font-weight: 700;
  border: 1px solid rgba(245, 158, 11, 0.3);
  transition: all var(--spring-press);
}

.nav-link-news:hover {
  background: var(--brass-bell);
  color: #ffffff;
  box-shadow: var(--shadow-brass);
  transform: translateY(-1px);
}

.nav-link-news::after {
  display: none;
}

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

/* ===================================================================
   昼夜模式切换按钮（高质感透明毛玻璃 · 纯矢量精雕微动效）
   =================================================================== */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-crescent-sm);
  background: rgba(125, 125, 125, 0.06);
  border: 1px solid var(--hairline);
  color: var(--text-secondary);
  cursor: pointer;
  outline: none;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--spring-press);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  background: rgba(125, 125, 125, 0.14);
  border-color: var(--hairline-focus);
  color: var(--cobalt-doraemon);
  transform: translateY(-1px);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  transition: transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.sun-icon {
  display: block;
}

.moon-icon {
  display: none;
}

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

[data-theme="dark"] .moon-icon {
  display: block;
}

/* 移动端汉堡切换 */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
}

/* ===================================================================
   物理下凹按钮 (Weighted Depth-Depression Primary Actions)
   =================================================================== */
.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-crescent-sm);
  cursor: pointer;
  transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.2s ease, background 0.2s ease;
  border: 1px solid transparent;
  white-space: nowrap;
  line-height: 1.25;
  text-align: center;
  user-select: none;
}

/* 主操作按钮：经典哆啦钴蓝 + 加权下凹深度响应 */
.btn-primary {
  background: linear-gradient(135deg, var(--cobalt-doraemon) 0%, var(--cobalt-deep) 100%);
  color: #ffffff !important;
  box-shadow: 0 4px 16px var(--cobalt-glow), 0 2px 4px rgba(2, 132, 199, 0.2);
}

.btn-primary:hover {
  box-shadow: 0 8px 24px rgba(2, 132, 199, 0.35);
  transform: translateY(-1.5px);
}

/* 核心点击手感：向瓷感白平面的加权下凹陷 (Weighted Depth-Depression) */
.btn-primary:active,
.btn-brass:active,
.btn-outline:active {
  transform: scale(0.975) translateY(2px);
  box-shadow: inset 0 3px 6px rgba(0, 0, 0, 0.24) !important;
}

.btn-brass {
  background: linear-gradient(135deg, var(--brass-bell) 0%, var(--brass-hover) 100%);
  color: #ffffff !important;
  box-shadow: 0 4px 16px var(--brass-glow);
}

.btn-brass:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
}

.btn-outline {
  background: var(--bg-plane);
  color: var(--text-primary);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-drawer);
}

.btn-outline:hover {
  border-color: var(--hairline-focus);
  color: var(--cobalt-doraemon);
  transform: translateY(-1.5px);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.06rem;
  border-radius: var(--radius-crescent-md);
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   主视觉区 (Hero Section)
   同心口袋几何 · 包含当前品牌名 · 优雅简介
   =================================================================== */
.hero {
  position: relative;
  padding: 100px 0 80px;
  overflow: hidden;
  text-align: center;
}

/* 4D 同心月牙几何光晕 (Concentric Pocket Silhouette Glow) */
.hero-crescent-architecture {
  position: absolute;
  top: -180px;
  left: 50%;
  transform: translateX(-50%);
  width: 920px;
  height: 520px;
  border-radius: 0 0 460px 460px;
  border-bottom: 2px solid var(--hairline-crescent);
  background: radial-gradient(ellipse at top, var(--cobalt-glow) 0%, rgba(2, 132, 199, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-crescent-inner {
  position: absolute;
  top: -60px;
  left: 50%;
  transform: translateX(-50%);
  width: 580px;
  height: 320px;
  border-radius: 0 0 290px 290px;
  border-bottom: 1.5px dashed var(--brass-glow);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

/* 黄铜铃铛徽章 */
.hero-pocket-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 20px;
  background: var(--bg-plane);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--cobalt-doraemon);
  box-shadow: var(--shadow-drawer);
  margin-bottom: 26px;
  transition: all var(--spring-press);
}

.bell-icon-sparkle {
  color: var(--brass-bell);
}

/* 大标题：严格包含‘当前品牌名’ 哆啦 A 梦 */
.hero-title {
  font-size: 3.4rem;
  font-weight: 850;
  line-height: 1.18;
  letter-spacing: -0.035em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.brand-gradient {
  background: linear-gradient(135deg, var(--cobalt-doraemon) 20%, var(--cobalt-deep) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.bell-accent-text {
  color: var(--brass-bell);
}

/* 简介与副标题 */
.hero-intro {
  font-size: 1.25rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 740px;
  margin: 0 auto 38px;
  font-weight: 450;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

/* 核心指标次元展台 (Spatial Metric Stand) */
.hero-spatial-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 26px 32px;
  background: var(--bg-plane);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pocket);
  box-shadow: var(--shadow-pocket);
  position: relative;
}

.hero-spatial-stats::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20%;
  right: 20%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cobalt-doraemon), transparent);
}

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

.stat-num {
  font-size: 2rem;
  font-weight: 850;
  color: var(--cobalt-doraemon);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 6px;
  font-weight: 500;
}

/* ===================================================================
   区块通用骨架与负空间
   =================================================================== */
.section {
  padding: 100px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-subtle);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-crescent-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--brass-bell);
  background: var(--brass-light);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 850;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-muted);
  line-height: 1.68;
}

/* ===================================================================
   产品核心优势：次元抽屉微动效 (Dimensional Drawer Expansion)
   鼠标悬停时从隐藏半月接缝平滑扩展滑出无拘带宽与验证徽章
   =================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.drawer-card {
  position: relative;
  background: var(--bg-plane);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-crescent-md);
  padding: 38px 30px 28px;
  box-shadow: var(--shadow-drawer);
  transition: transform var(--spring-drawer), box-shadow var(--spring-drawer), border-color 0.25s ease;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* 隐藏的次元月牙接缝线 (Hidden Crescent Seam) */
.drawer-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--cobalt-doraemon), var(--brass-bell));
  opacity: 0;
  transform: scaleX(0.4);
  transition: all var(--spring-drawer);
}

.drawer-card:hover {
  transform: translateY(-8px);
  border-color: var(--hairline-crescent);
  box-shadow: var(--shadow-drawer-hover);
}

.drawer-card:hover::before {
  opacity: 1;
  transform: scaleX(1);
}

.drawer-icon-capsule {
  width: 60px;
  height: 60px;
  border-radius: 16px 16px 26px 26px; /* 口袋微型轮廓 */
  background: var(--cobalt-surface);
  color: var(--cobalt-doraemon);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: all var(--spring-drawer);
}

.drawer-card:hover .drawer-icon-capsule {
  background: linear-gradient(135deg, var(--cobalt-doraemon) 0%, var(--cobalt-deep) 100%);
  color: #fff;
  transform: scale(1.08) rotate(-3deg);
  box-shadow: 0 8px 18px var(--cobalt-glow);
}

.drawer-title {
  font-size: 1.38rem;
  font-weight: 750;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.drawer-text {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

/* 抽屉抽拉层：物理向外滑出揭晓规格 */
.drawer-expansion-slot {
  border-top: 1px dashed var(--hairline);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.drawer-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.drawer-badge-pill svg {
  color: var(--cobalt-doraemon);
  flex-shrink: 0;
}

/* ===================================================================
   专项图卡：流媒体图卡 + AI 生产力支持图卡
   =================================================================== */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 34px;
}

.showcase-pocket-card {
  background: var(--bg-plane);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pocket);
  padding: 44px 38px;
  box-shadow: var(--shadow-drawer);
  transition: transform var(--spring-drawer), box-shadow var(--spring-drawer), border-color 0.25s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.showcase-pocket-card:hover {
  transform: translateY(-6px);
  border-color: var(--hairline-focus);
  box-shadow: var(--shadow-drawer-hover);
}

.showcase-header {
  margin-bottom: 24px;
}

.showcase-tag-brass {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  background: var(--brass-light);
  color: var(--brass-hover);
  border-radius: var(--radius-full);
  font-size: 0.84rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.showcase-tag-cobalt {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  background: var(--cobalt-surface);
  color: var(--cobalt-doraemon);
  border-radius: var(--radius-full);
  font-size: 0.84rem;
  font-weight: 700;
  margin-bottom: 16px;
}

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

.showcase-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.68;
}

/* 磁力微药丸网格 */
.magnetic-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0;
}

.magnetic-pill-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-crescent-sm);
  font-size: 0.92rem;
  font-weight: 650;
  color: var(--text-primary);
  transition: all var(--spring-press);
}

.magnetic-pill-item:hover {
  background: var(--cobalt-surface);
  border-color: var(--cobalt-doraemon);
  color: var(--cobalt-doraemon);
  transform: translateY(-2px);
}

.verified-pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brass-bell);
}

.showcase-spec-matrix {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 20px;
  background: var(--bg-subtle);
  border-radius: var(--radius-crescent-sm);
  border: 1px solid var(--hairline);
}

.spec-cell strong {
  display: block;
  font-size: 1.12rem;
  color: var(--cobalt-doraemon);
  font-weight: 800;
}

.spec-cell span {
  font-size: 0.84rem;
  color: var(--text-muted);
}

/* ===================================================================
   套餐价格对比表 (参考网上真实机场/加速器行情定价)
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-pocket-card {
  background: var(--bg-plane);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pocket);
  padding: 44px 34px;
  box-shadow: var(--shadow-drawer);
  transition: all var(--spring-drawer);
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-pocket-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-drawer-hover);
  border-color: var(--hairline-focus);
}

/* 进阶爆款卡片高亮推荐 */
.pricing-pocket-card.featured {
  border: 2px solid var(--cobalt-doraemon);
  box-shadow: 0 16px 40px -8px var(--cobalt-glow);
  transform: scale(1.025);
}

.pricing-pocket-card.featured:hover {
  transform: scale(1.025) translateY(-8px);
}

.bell-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--brass-bell) 0%, var(--brass-hover) 100%);
  color: #fff;
  padding: 5px 22px;
  font-size: 0.82rem;
  font-weight: 800;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-brass);
}

.plan-header {
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 26px;
  margin-bottom: 24px;
  text-align: center;
}

.plan-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

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

.plan-price-row {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin: 20px 0 8px;
}

.price-currency {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--cobalt-doraemon);
}

.price-integer {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-primary);
  letter-spacing: -0.04em;
}

.price-cycle {
  font-size: 0.94rem;
  color: var(--text-muted);
  font-weight: 600;
}

.plan-bandwidth-tag {
  display: inline-block;
  padding: 5px 14px;
  background: var(--bg-subtle);
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.plan-features-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  font-size: 0.93rem;
  color: var(--text-secondary);
}

.plan-feature-item svg {
  color: var(--cobalt-doraemon);
  flex-shrink: 0;
  margin-top: 3px;
}

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

.review-pocket-card {
  background: var(--bg-plane);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-crescent-md);
  padding: 34px 28px;
  box-shadow: var(--shadow-drawer);
  transition: all var(--spring-drawer);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-pocket-card:hover {
  transform: translateY(-5px);
  border-color: var(--hairline-crescent);
  box-shadow: var(--shadow-drawer-hover);
}

.review-bell-stars {
  display: flex;
  gap: 4px;
  color: var(--brass-bell);
  margin-bottom: 16px;
  font-size: 1.15rem;
}

.review-body {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--hairline);
  padding-top: 18px;
}

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 12px 12px 20px 20px;
  background: linear-gradient(135deg, var(--cobalt-doraemon), var(--cobalt-deep));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.reviewer-info h4 {
  font-size: 0.98rem;
  font-weight: 750;
  color: var(--text-primary);
}

.reviewer-info p {
  font-size: 0.83rem;
  color: var(--text-muted);
}

/* ===================================================================
   常见问题解答 (FAQ) 手风琴
   =================================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-drawer {
  background: var(--bg-plane);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-crescent-sm);
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-drawer:hover {
  border-color: var(--hairline-focus);
}

.faq-question-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 26px;
  cursor: pointer;
  user-select: none;
  font-weight: 700;
  font-size: 1.06rem;
  color: var(--text-primary);
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  color: var(--cobalt-doraemon);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
}

.faq-drawer.active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--brass-bell);
}

.faq-answer-pane {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0, 1, 0, 1);
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.75;
}

.faq-drawer.active .faq-answer-pane {
  max-height: 520px;
  transition: max-height 0.45s ease-in-out;
}

.faq-answer-content {
  padding: 0 26px 24px;
}

/* ===================================================================
   页尾呼吁号召条幅 (Crescent CTA Banner)
   =================================================================== */
.cta-crescent-banner {
  background: linear-gradient(135deg, var(--cobalt-doraemon) 0%, var(--cobalt-deep) 100%);
  border-radius: var(--radius-pocket);
  padding: 64px 44px;
  text-align: center;
  color: #fff;
  box-shadow: 0 20px 45px -10px var(--cobalt-glow);
  position: relative;
  overflow: hidden;
  margin-top: 40px;
}

.cta-crescent-banner h2 {
  font-size: 2.35rem;
  font-weight: 850;
  margin-bottom: 16px;
}

.cta-crescent-banner p {
  font-size: 1.15rem;
  opacity: 0.93;
  max-width: 650px;
  margin: 0 auto 34px;
}

.btn-bell-white {
  background: #ffffff;
  color: var(--cobalt-deep) !important;
  font-weight: 800;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.btn-bell-white:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.28);
}

/* ===================================================================
   页脚 (Footer) - 严格只保留 4 个标题，并在新页面打开
   =================================================================== */
.footer {
  background: var(--bg-plane);
  border-top: 1px solid var(--hairline);
  padding: 56px 0 38px;
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 44px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.footer-link {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: var(--radius-crescent-sm);
  transition: all var(--spring-press);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-link:hover {
  color: var(--cobalt-doraemon);
  background: var(--bg-subtle);
  transform: translateY(-1.5px);
}

.footer-link svg {
  width: 15px;
  height: 15px;
  opacity: 0.65;
}

.footer-copyright {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
  border-top: 1px solid var(--hairline);
  padding-top: 26px;
}

/* ===================================================================
   独立子页面通用版式 (about, terms, privacy, sitemap, news)
   =================================================================== */
.subpage-hero {
  padding: 70px 0 45px;
  text-align: center;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--hairline);
  position: relative;
}

.subpage-title {
  font-size: 2.6rem;
  font-weight: 850;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.subpage-subtitle {
  font-size: 1.12rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

.article-container {
  max-width: 900px;
  margin: 60px auto;
  padding: 0 28px;
}

.article-pocket-card {
  background: var(--bg-plane);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pocket);
  padding: 50px 44px;
  box-shadow: var(--shadow-drawer);
}

.article-pocket-card h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 38px 0 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.article-pocket-card h2:first-child {
  margin-top: 0;
}

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

.article-pocket-card p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.82;
  margin-bottom: 18px;
}

.article-pocket-card ul, .article-pocket-card ol {
  margin: 14px 0 24px 26px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.article-pocket-card li {
  margin-bottom: 9px;
}

.highlight-box-alert {
  padding: 22px;
  border-radius: var(--radius-crescent-sm);
  margin: 26px 0;
  font-size: 0.98rem;
  line-height: 1.72;
}

.alert-danger {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #dc2626;
}

.alert-success {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #059669;
}

[data-theme="dark"] .alert-danger {
  color: #f87171;
}

[data-theme="dark"] .alert-success {
  color: #34d399;
}

/* 资讯专页网格 (News & Insights Grid) */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
  margin-top: 28px;
}

.news-card {
  background: var(--bg-plane);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-crescent-md);
  padding: 30px;
  box-shadow: var(--shadow-drawer);
  transition: all var(--spring-drawer);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.news-card:hover {
  transform: translateY(-5px);
  border-color: var(--hairline-focus);
  box-shadow: var(--shadow-drawer-hover);
}

.news-date {
  font-size: 0.82rem;
  color: var(--brass-bell);
  font-weight: 700;
  margin-bottom: 10px;
}

.news-title {
  font-size: 1.28rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.45;
}

.news-excerpt {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.68;
  margin-bottom: 20px;
  flex-grow: 1;
}

.news-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--hairline);
  padding-top: 14px;
}

.news-tag {
  font-size: 0.78rem;
  padding: 3px 10px;
  background: var(--cobalt-surface);
  color: var(--cobalt-doraemon);
  border-radius: var(--radius-full);
  font-weight: 700;
}

/* ===================================================================
   响应式媒体查询 (@media 媒体查询)
   手机端单栏优雅流式排版，按钮触控友好 (≥ 48px)
   =================================================================== */
@media (max-width: 1080px) {
  .hero-title {
    font-size: 2.85rem;
  }
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-pocket-card.featured {
    transform: none;
  }
  .pricing-pocket-card.featured:hover {
    transform: translateY(-8px);
  }
  .hero-spatial-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 78px;
    left: 0;
    right: 0;
    background: var(--bg-plane);
    border-bottom: 1px solid var(--hairline);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: var(--shadow-drawer-hover);
    display: none;
  }
  .nav-menu.open {
    display: flex;
  }
  .menu-toggle {
    display: block;
  }
  .nav-actions .btn-primary {
    display: none;
  }
  .hero {
    padding: 60px 0 45px;
  }
  .hero-title {
    font-size: 2.15rem;
  }
  .hero-intro {
    font-size: 1.05rem;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
    min-height: 50px;
  }
  .hero-spatial-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 20px 16px;
  }
  .features-grid,
  .showcase-grid,
  .pricing-grid,
  .reviews-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 65px 0;
  }
  .section-title {
    font-size: 1.88rem;
  }
  .showcase-pocket-card,
  .pricing-pocket-card,
  .cta-crescent-banner {
    padding: 32px 22px;
  }
  .cta-crescent-banner h2 {
    font-size: 1.85rem;
  }
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
  .article-pocket-card {
    padding: 28px 20px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }
  .hero-spatial-stats {
    grid-template-columns: 1fr;
  }
  .btn {
    min-height: 48px;
    font-size: 0.95rem;
  }
}

/* ===================================================================
   深度长篇 SEO 文章排版与交互系统 (Article Reader & TOC)
   =================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

.breadcrumb a:hover {
  color: var(--cobalt-doraemon);
}

.breadcrumb-separator {
  opacity: 0.5;
}

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

.article-main-title {
  font-size: 2.35rem;
  font-weight: 850;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

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

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

/* 目录卡片 (Table of Contents Box) */
.toc-box {
  background: var(--bg-subtle);
  border: 1px solid var(--hairline);
  border-left: 4px solid var(--cobalt-doraemon);
  border-radius: var(--radius-crescent-sm);
  padding: 24px 28px;
  margin: 32px 0 42px;
  box-shadow: var(--shadow-sm);
}

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

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
}

.toc-list li {
  margin-bottom: 4px;
}

.toc-link {
  color: var(--cobalt-doraemon);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--spring-press);
}

.toc-link:hover {
  text-decoration: underline;
  color: var(--brass-hover);
}

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

.article-body-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  gap: 10px;
  scroll-margin-top: 90px;
}

.article-body-content h3 {
  font-size: 1.3rem;
  font-weight: 750;
  color: var(--text-primary);
  margin: 28px 0 14px;
  scroll-margin-top: 90px;
}

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

.article-body-content ul,
.article-body-content ol {
  margin: 14px 0 24px 28px;
}

.article-body-content li {
  margin-bottom: 8px;
}

.article-body-content blockquote {
  border-left: 4px solid var(--brass-bell);
  background: var(--brass-light);
  padding: 16px 22px;
  margin: 24px 0;
  border-radius: 0 var(--radius-crescent-sm) var(--radius-crescent-sm) 0;
  color: var(--text-primary);
  font-weight: 500;
}

/* 比较表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 26px 0 34px;
  border-radius: var(--radius-crescent-sm);
  border: 1px solid var(--hairline);
}

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

.seo-table th {
  background: var(--bg-subtle);
  color: var(--text-primary);
  padding: 14px 18px;
  font-weight: 750;
  border-bottom: 1px solid var(--hairline);
}

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

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

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

/* 内链与锚文本 */
.seo-internal-link {
  color: var(--cobalt-doraemon);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--spring-press);
}

.seo-internal-link:hover {
  color: var(--brass-hover);
}

/* 文章内置 FAQ */
.article-faq-wrapper {
  margin: 50px 0 40px;
  padding: 34px 28px;
  background: var(--bg-subtle);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-crescent-md);
}

.article-faq-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.faq-card-item {
  background: var(--bg-plane);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-crescent-sm);
  padding: 20px 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

.faq-card-item h4 {
  font-size: 1.08rem;
  font-weight: 750;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.faq-card-item p {
  margin-bottom: 0;
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 相关阅读推荐 */
.related-reads-section {
  margin-top: 60px;
  padding-top: 36px;
  border-top: 1px solid var(--hairline);
}

.related-reads-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.related-read-card {
  background: var(--bg-subtle);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-crescent-sm);
  padding: 20px 22px;
  transition: all var(--spring-press);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-read-card:hover {
  background: var(--bg-plane);
  border-color: var(--hairline-focus);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.related-read-card h4 {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.related-read-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 12px;
}

.related-read-link {
  font-size: 0.86rem;
  color: var(--cobalt-doraemon);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

@media (max-width: 768px) {
  .article-main-title {
    font-size: 1.85rem;
  }
  .related-reads-grid {
    grid-template-columns: 1fr;
  }
  .toc-box {
    padding: 18px 20px;
  }
  .article-faq-wrapper {
    padding: 22px 18px;
  }
}