/**
 * 肯の机 (kendeji.best) - Japanese Lifestyle Zen-Minimalist Style
 * Inspired by: "Less hassle, more life" (少些繁冗，多点生活)
 * Palette: Warm rice-paper ivory, graphite wool, linen-beige
 * Pure Vanilla CSS3, Zero Heavy Frameworks
 */

/* ==========================================================================
   1. 设计系统与色彩变量 (Artisanal Zen Palette)
   ========================================================================== */
:root {
  /* 白天模式 (默认) - 暖米纸象牙白 + 亚麻米色 + 羊毛石墨灰 */
  --bg-main: #faf9f6;
  --bg-card: #ffffff;
  --bg-card-alt: #f4f0e6;
  --bg-card-hover: #fcfbfa;
  --bg-glass: rgba(250, 249, 246, 0.88);
  --bg-pill: rgba(31, 33, 36, 0.05);
  --bg-accent-soft: #f2eee5;
  
  --border-subtle: #e8e3d8;
  --border-focus: #d1c9b8;
  --border-accent: #c4baa4;
  
  --text-main: #1f2124;
  --text-secondary: #5c5953;
  --text-muted: #8c877e;
  --text-inverted: #faf9f6;
  
  /* 禅意自然点缀色 (抹茶、红陶、古铜、水墨蓝) */
  --primary: #1f2124;
  --primary-hover: #3a3835;
  --accent-vermilion: #b85438;
  --accent-matcha: #3d5a45;
  --accent-bronze: #b88648;
  --accent-indigo: #3a4d6b;
  
  --shadow-ambient: 0 20px 45px -15px rgba(50, 45, 35, 0.06), 0 2px 10px rgba(50, 45, 35, 0.02);
  --shadow-hover: 0 25px 50px -12px rgba(50, 45, 35, 0.12), 0 4px 16px rgba(50, 45, 35, 0.04);
  --shadow-sm: 0 1px 3px rgba(50, 45, 35, 0.05);
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --transition-fast: 0.18s ease;
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-theme: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
  
  --container-max: 1160px;
}

/* 黑夜模式 - 静谧深墨 (Sumi Charcoal) + 柔和温润微光 */
[data-theme="dark"] {
  --bg-main: #141618;
  --bg-card: #1c1e22;
  --bg-card-alt: #181a1d;
  --bg-card-hover: #22252a;
  --bg-glass: rgba(20, 22, 24, 0.88);
  --bg-pill: rgba(255, 255, 255, 0.07);
  --bg-accent-soft: #191b1f;
  
  --border-subtle: #292d34;
  --border-focus: #3d424d;
  --border-accent: #484e5b;
  
  --text-main: #e8e6e1;
  --text-secondary: #9e9b94;
  --text-muted: #6e6b65;
  --text-inverted: #141618;
  
  --primary: #f2eee5;
  --primary-hover: #ffffff;
  --accent-vermilion: #d46f52;
  --accent-matcha: #5a7d64;
  --accent-bronze: #d9a463;
  --accent-indigo: #5d759a;
  
  --shadow-ambient: 0 20px 45px -15px rgba(0, 0, 0, 0.5), 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 25px 50px -12px rgba(0, 0, 0, 0.7), 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
}

/* ==========================================================================
   2. 全局重置与排版规范
   ========================================================================== */
*, *::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", "Noto Serif SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.75;
  transition: var(--transition-theme);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  letter-spacing: 0.01em;
}

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

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

ul, ol {
  list-style: none;
}

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

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

/* ==========================================================================
   3. 顶部导航栏 (Navbar)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-theme);
}

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

/* 品牌 Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.brand-logo:hover {
  opacity: 0.88;
}

.site-logo-img {
  height: 40px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: transform var(--transition-normal);
}

.brand-logo:hover .site-logo-img {
  transform: scale(1.02);
}

.brand-motto-tag {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  padding-left: 10px;
  border-left: 1px solid var(--border-subtle);
  font-weight: 500;
}

/* 桌面导航链接 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 8px 0;
  letter-spacing: 0.02em;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-main);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--accent-vermilion);
  transition: width 0.25s ease, left 0.25s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
  left: 0;
}

/* 推荐资讯特别标签入口 */
.nav-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-vermilion) !important;
  font-weight: 600;
}

.nav-link-badge .dot-ping {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-vermilion);
}

/* 导航右侧交互区 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 昼夜模式切换按钮 (精致毛玻璃极简，温润质感) */
.theme-toggle-btn {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
  cursor: pointer;
  padding: 0;
}

.theme-toggle-btn:hover {
  color: var(--text-main);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-normal);
}

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

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

/* 移动端汉堡菜单触发器 */
.mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  background: var(--bg-card);
}

/* ==========================================================================
   4. 通用按钮组件与木印章触感交互 (Buttons & Stamp Interaction)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
  white-space: nowrap;
  text-align: center;
  cursor: pointer;
  min-height: 44px;
  letter-spacing: 0.03em;
  position: relative;
}

.btn-primary {
  background: var(--primary);
  color: var(--text-inverted) !important;
  border: 1px solid var(--primary);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
  min-height: 48px;
}

.btn-block {
  width: 100%;
}

/* 模拟木质印章按压触感 (Analog Wooden Stamp) */
.stamp-btn {
  position: relative;
  overflow: hidden;
}

.stamp-btn:active {
  transform: scale(0.97);
  transition: transform 0.08s ease;
}

.stamp-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  color: var(--accent-vermilion);
  border: 1px solid var(--accent-vermilion);
  padding: 1px 6px;
  border-radius: 3px;
  font-family: "Noto Serif SC", serif;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   5. 主视觉区 (Hero Section - 禅意生活空间)
   ========================================================================== */
.hero-section {
  padding: 85px 0 75px;
  position: relative;
}

.hero-content {
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
}

.hero-motto-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--bg-card-alt);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.86rem;
  font-weight: 500;
  margin-bottom: 28px;
  letter-spacing: 0.04em;
}

.hero-title {
  font-size: 2.85rem;
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Serif SC", serif;
}

.hero-title-brand {
  color: var(--accent-vermilion);
  position: relative;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.16rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 24px;
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 400;
}

/* 品牌详细简介段落 */
.hero-intro-text {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.9;
  max-width: 720px;
  margin: 0 auto 36px;
  padding: 18px 24px;
  background: var(--bg-card-alt);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-subtle);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

/* 极简呼吸状态条 (Serene Status Pills) */
.hero-status-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.status-pill-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: var(--radius-full);
}

.status-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-matcha);
}

/* 拟态工作台 - 专线节点平缓卡片 */
.zen-workspace-card {
  margin-top: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-ambient);
  text-align: left;
}

.workspace-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.workspace-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.workspace-badge {
  font-size: 0.75rem;
  background: var(--bg-pill);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
}

.node-region-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.node-minimal-chip {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 16px;
  transition: all var(--transition-normal);
}

.node-minimal-chip:hover {
  border-color: var(--border-focus);
  background: var(--bg-card);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.node-chip-city {
  font-size: 0.92rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-main);
}

.node-chip-spec {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.node-chip-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
}

.node-latency-text {
  font-weight: 700;
  color: var(--accent-matcha);
  font-feature-settings: "tnum";
}

/* ==========================================================================
   6. 模块通用标题排版
   ========================================================================== */
.section {
  padding: 95px 0;
  position: relative;
}

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

.section-header {
  text-align: center;
  max-width: 660px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-vermilion);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.15rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin-bottom: 14px;
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Serif SC", serif;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ==========================================================================
   7. 核心优势模块 (3 个图文卡片)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 36px 30px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-ambient);
}

.feature-number {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-bronze);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  font-family: "Noto Serif SC", serif;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 750;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-desc {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-points {
  border-top: 1px solid var(--border-subtle);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-point-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.feature-point-item svg {
  color: var(--accent-matcha);
  flex-shrink: 0;
}

/* ==========================================================================
   8. 流媒体与 AI 双核心支持大图卡
   ========================================================================== */
.dual-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.media-ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 34px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.media-ai-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-ambient);
}

.card-top-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 18px;
  align-self: flex-start;
  letter-spacing: 0.04em;
}

.tag-media {
  background: rgba(184, 84, 56, 0.08);
  color: var(--accent-vermilion);
  border: 1px solid rgba(184, 84, 56, 0.2);
}

.tag-ai {
  background: rgba(61, 90, 69, 0.08);
  color: var(--accent-matcha);
  border: 1px solid rgba(61, 90, 69, 0.2);
}

.media-ai-card h3 {
  font-size: 1.5rem;
  font-weight: 750;
  margin-bottom: 12px;
  color: var(--text-main);
}

.card-summary {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}

.service-badges-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.zen-service-chip {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  font-size: 0.85rem;
  color: var(--text-main);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.zen-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}
.dot-netflix { background: #e50914; }
.dot-youtube { background: #ff0000; }
.dot-disney { background: #113ccf; }
.dot-chatgpt { background: #10a37f; }
.dot-claude { background: #d97706; }
.dot-cursor { background: #06b6d4; }

.card-feature-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: auto;
  border-top: 1px solid var(--border-subtle);
  padding-top: 20px;
}

.card-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.card-feature-item svg {
  color: var(--accent-matcha);
  flex-shrink: 0;
  margin-top: 3px;
}

/* ==========================================================================
   9. 套餐价格对比表 (参考网上真实套餐价格)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-ambient);
}

/* 热销高亮推荐卡片 */
.pricing-card.featured {
  border-color: var(--accent-vermilion);
  background: var(--bg-card);
  box-shadow: var(--shadow-ambient);
}

.featured-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-vermilion);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.plan-title {
  font-size: 1.2rem;
  font-weight: 750;
  color: var(--text-main);
  margin-bottom: 6px;
  text-align: center;
}

.plan-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
  min-height: 36px;
  line-height: 1.5;
}

.pricing-price-box {
  text-align: center;
  padding: 18px 0;
  border-top: 1px dashed var(--border-subtle);
  border-bottom: 1px dashed var(--border-subtle);
  margin-bottom: 22px;
}

.price-currency {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.price-number {
  font-size: 2.6rem;
  font-weight: 850;
  color: var(--text-main);
  line-height: 1;
}

.price-period {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: block;
  margin-top: 4px;
}

.pricing-specs {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 26px;
  flex-grow: 1;
}

.spec-item {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

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

.spec-item.disabled {
  color: var(--text-muted);
  text-decoration: line-through;
}

.spec-item.disabled svg {
  color: var(--text-muted);
}

/* ==========================================================================
   10. 用户评价 (User Reviews)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.review-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-focus);
}

.review-stars {
  font-size: 0.9rem;
  color: var(--accent-bronze);
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-comment {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 22px;
  flex-grow: 1;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.reviewer-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-card-alt);
  color: var(--accent-vermilion);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.92rem;
  border: 1px solid var(--border-subtle);
}

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

.reviewer-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

.reviewer-role {
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* ==========================================================================
   11. 常见问题解答 (FAQ)
   ========================================================================== */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.faq-question {
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  background: none;
  cursor: pointer;
}

.faq-icon {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 22px;
  transition: max-height 0.35s cubic-bezier(1, 0, 1, 0);
}

.faq-answer p {
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ==========================================================================
   12. 极简页脚 (严格只保留四个标题在新页面展示)
   ========================================================================== */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
  padding: 50px 0 36px;
  transition: var(--transition-theme);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  text-align: center;
}

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

.footer-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  padding: 6px 10px;
}

.footer-link:hover {
  color: var(--accent-vermilion);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   13. 独立子页面通用排版与推荐资讯 (Subpages & Journal)
   ========================================================================== */
.subpage-hero {
  padding: 60px 0 45px;
  text-align: center;
  background: var(--bg-card-alt);
  border-bottom: 1px solid var(--border-subtle);
}

.subpage-title {
  font-size: 2.35rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Serif SC", serif;
}

.subpage-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

.article-content {
  max-width: 840px;
  margin: 45px auto 75px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 44px 38px;
  box-shadow: var(--shadow-sm);
}

.article-content h2 {
  font-size: 1.4rem;
  font-weight: 750;
  margin: 34px 0 16px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 10px;
}

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

.article-content p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 18px;
}

.article-content ul {
  list-style: disc;
  padding-left: 22px;
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.article-content li {
  margin-bottom: 8px;
  line-height: 1.75;
}

.alert-box {
  background: var(--bg-card-alt);
  border-left: 3px solid var(--accent-vermilion);
  padding: 16px 20px;
  margin: 22px 0;
  font-size: 0.92rem;
  color: var(--text-main);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* 推荐资讯卡片网格 (Journal Articles Grid) */
.journal-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 36px;
}

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

.journal-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-ambient);
}

.journal-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.journal-tag {
  color: var(--accent-vermilion);
  font-weight: 600;
  background: var(--bg-card-alt);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.journal-title {
  font-size: 1.25rem;
  font-weight: 750;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.45;
}

.journal-excerpt {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 20px;
  flex-grow: 1;
}

/* ==========================================================================
   13.1 深度文章排版 (Deep Article Layout & SEO Components)
   ========================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

.breadcrumb a:hover {
  color: var(--accent-vermilion);
}

.article-header {
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 24px;
}

.article-header h1 {
  font-size: 2.15rem;
  line-height: 1.35;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Serif SC", serif;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.84rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

/* 目录盒子 (Table of Contents) */
.article-toc {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 30px 0 40px;
}

.toc-title {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toc-list li {
  font-size: 0.92rem;
  line-height: 1.6;
}

.toc-list a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.toc-list a:hover {
  color: var(--accent-vermilion);
  text-decoration: underline;
}

/* 正文元素 */
.article-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 26px 0 12px;
  color: var(--text-main);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9rem;
}

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

.article-table th {
  background: var(--bg-card-alt);
  font-weight: 700;
  color: var(--text-main);
}

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

/* 文中行动呼吁横幅 (In-Article CTA) */
.inline-cta-box {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--accent-vermilion);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 36px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.inline-cta-info h4 {
  font-size: 1.15rem;
  font-weight: 750;
  margin-bottom: 6px;
  color: var(--text-main);
}

.inline-cta-info p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0 !important;
}

/* 文末 FAQ 问答块 */
.article-faq-section {
  margin-top: 50px;
  border-top: 2px solid var(--border-subtle);
  padding-top: 36px;
}

.article-faq-item {
  margin-bottom: 22px;
}

.article-faq-item h4 {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--text-main);
  margin-bottom: 8px;
}

.article-faq-item p {
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* 相关推荐阅读 (Related Reading) */
.related-posts-section {
  margin-top: 50px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 36px;
}

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

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

.related-post-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.related-post-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.5;
}

.related-post-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   14. 响应式媒体查询 (@media - 移动端完美单栏自适应)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.35rem;
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .node-region-tabs {
    grid-template-columns: repeat(2, 1fr);
  }
  .journal-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-subtle);
    padding: 24px;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow-ambient);
    display: none;
  }

  .nav-menu.open {
    display: flex;
  }

  .mobile-toggle {
    display: flex;
  }

  .brand-motto-tag {
    display: none;
  }

  .hero-section {
    padding: 50px 0 40px;
  }

  .hero-title {
    font-size: 1.95rem;
  }

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

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

  .hero-cta-group .btn {
    width: 100%;
  }

  .node-region-tabs {
    grid-template-columns: 1fr;
  }

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

  .dual-cards-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .article-content {
    padding: 28px 20px;
    margin: 25px auto;
  }

  .section {
    padding: 65px 0;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
}