/* ==========================================================================
   红杏云 (HongXingYun) - 东方禅意极简设计系统 (Zen-Minimalist Design System)
   Theme: Contemporary Oriental Zen · Rice-Paper White & Lacquer Cinnabar Red
   Palette:
     - Textured Rice-Paper White: #fcfbf9
     - Muted Slate Brick-Grey: #2b2d31
     - Vibrant Lacquer Cinnabar Red: #e63946
   ========================================================================== */

/* 1. 禅意设计变量 (Design Tokens) */
:root {
  /* 东方核心色彩 */
  --zen-cinnabar: #e63946;          /* 漆雕朱砂红 (主强调色) */
  --zen-cinnabar-hover: #c1121f;    /* 深朱砂红 */
  --zen-cinnabar-light: rgba(230, 57, 70, 0.08);
  --zen-cinnabar-glow: rgba(230, 57, 70, 0.22);
  --zen-gold: #c99a5e;              /* 暖竹金泥 */
  --zen-jade: #2a9d8f;              /* 青瓷碧翠 */

  /* 白天模式色彩 (默认：宣纸白与黛瓦灰) */
  --bg-body: #fcfbf9;               /* 宣纸象牙白 */
  --bg-card: #ffffff;               /* 素白卡片 */
  --bg-card-hover: #faf9f5;
  --bg-card-elevated: #f4f2eb;      /* 浅灰砖石基底 */
  --bg-header: rgba(252, 251, 249, 0.92);
  --border-color: #e8e5dc;          /* 仿古青砖灰泥缝线 */
  --border-light: #f0ede6;
  --gridline-color: rgba(43, 45, 49, 0.05); /* 园林窗棂格线 */
  --text-main: #2b2d31;             /* 黛瓦青石黑 (主标题与正文) */
  --text-secondary: #575a61;        /* 砚墨次文字 */
  --text-muted: #8b8f97;            /* 淡墨辅助色 */
  
  --shadow-sm: 0 1px 3px rgba(43, 45, 49, 0.04);
  --shadow-md: 0 6px 18px -2px rgba(43, 45, 49, 0.06);
  --shadow-lg: 0 14px 30px -4px rgba(43, 45, 49, 0.08);
  --shadow-cinnabar: 0 8px 24px -4px rgba(230, 57, 70, 0.28);
  
  --toggle-bg: rgba(43, 45, 49, 0.05);
  --toggle-border: rgba(43, 45, 49, 0.12);
  --seal-bg: rgba(230, 57, 70, 0.08);
  --seal-border: rgba(230, 57, 70, 0.35);
  --seal-text: #e63946;
}

/* 黑夜模式色彩 (Dark Mode: 沉香水墨黑与幽夜黛瓦) */
[data-theme="dark"] {
  --bg-body: #141619;               /* 沉香水墨黑 */
  --bg-card: #1c1f24;               /* 黛瓦暗石黑 */
  --bg-card-hover: #22262d;
  --bg-card-elevated: #262a32;
  --bg-header: rgba(20, 22, 25, 0.92);
  --border-color: #2b2f38;
  --border-light: #242831;
  --gridline-color: rgba(255, 255, 255, 0.04);
  --text-main: #f5f3ee;             /* 宣纸白字 */
  --text-secondary: #a6abb5;
  --text-muted: #6e7480;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 14px 35px rgba(0, 0, 0, 0.7);
  --shadow-cinnabar: 0 8px 28px -2px rgba(230, 57, 70, 0.4);
  
  --toggle-bg: rgba(255, 255, 255, 0.08);
  --toggle-border: rgba(255, 255, 255, 0.18);
  --seal-bg: rgba(230, 57, 70, 0.18);
  --seal-border: rgba(230, 57, 70, 0.45);
  --seal-text: #ff5c6a;
}

/* 2. 基础重置与排版 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Serif SC", serif, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-body);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.35s cubic-bezier(0.16, 1, 0.3, 1), color 0.35s ease;
  overflow-x: hidden;
  position: relative;
}

/* 宣纸纹理微底纹与建筑窗棂格线背景 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(to right, var(--gridline-color) 1px, transparent 1px),
    linear-gradient(to bottom, var(--gridline-color) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

/* 3. 布局与容器 */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 92px 0;
  position: relative;
  z-index: 1;
}

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

.section-header {
  max-width: 760px;
  margin: 0 auto 56px auto;
  text-align: center;
}

/* 传统金石印章印记徽标 (Seal Badge) */
.zen-seal-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 16px;
  background: var(--seal-bg);
  color: var(--seal-text);
  border: 1px solid var(--seal-border);
  border-radius: 4px;
  font-size: 0.825rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 18px;
  box-shadow: 0 2px 8px rgba(230, 57, 70, 0.1);
}

.zen-seal-badge::before {
  content: "「";
  color: var(--zen-cinnabar);
}

.zen-seal-badge::after {
  content: "」";
  color: var(--zen-cinnabar);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 18px;
  color: var(--text-main);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* 4. 顶部导航栏 (Navbar) */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background-color: var(--bg-header);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.site-logo {
  height: 44px;
  width: auto;
  max-width: 220px;
  display: block;
  object-fit: contain;
  transition: transform 0.25s ease, filter 0.25s ease;
}

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

[data-theme="dark"] .site-logo {
  filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.45)) brightness(1.08);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 4px;
  position: relative;
  transition: color 0.25s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--zen-cinnabar);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 18px;
  height: 2px;
  background-color: var(--zen-cinnabar);
  transition: transform 0.25s ease;
}

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

/* 推荐资讯特别高亮徽章 */
.nav-link-badge {
  display: inline-block;
  padding: 1px 6px;
  font-size: 0.72rem;
  background: var(--zen-cinnabar);
  color: #fff;
  border-radius: 999px;
  margin-left: 4px;
  font-weight: 600;
  vertical-align: 1px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 精致且专业化的昼夜模式切换按钮 */
.theme-toggle-btn {
  background: var(--toggle-bg);
  border: 1px solid var(--toggle-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  transition: all 0.25s ease;
  padding: 0;
}

.theme-toggle-btn:hover {
  transform: translateY(-2px);
  border-color: var(--zen-cinnabar);
  box-shadow: 0 4px 12px var(--zen-cinnabar-glow);
  color: var(--zen-cinnabar);
}

.theme-icon-sun {
  display: none;
}

.theme-icon-moon {
  display: block;
}

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

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #e63946 0%, #d90429 100%);
  color: #ffffff;
  box-shadow: var(--shadow-cinnabar);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #c1121f 0%, #b0021f 100%);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px -2px rgba(230, 57, 70, 0.45);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--zen-cinnabar);
  color: var(--zen-cinnabar);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.0625rem;
  border-radius: 10px;
}

.btn-block {
  width: 100%;
}

/* 5. 东方禅意主视觉区 (Hero Section with Organic Apricot Branch Canvas) */
.hero {
  padding: 90px 0 80px 0;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-color);
}

.hero-grid-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-headline {
  font-size: 3.3rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--text-main);
}

.hero-headline .highlight {
  color: var(--zen-cinnabar);
  position: relative;
  display: inline-block;
}

.hero-headline .highlight::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 4px;
  width: 100%;
  height: 8px;
  background: rgba(230, 57, 70, 0.15);
  border-radius: 4px;
  z-index: -1;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 34px;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 38px;
  flex-wrap: wrap;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--text-muted);
  font-size: 0.875rem;
  flex-wrap: wrap;
}

.hero-guarantee-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-guarantee-item svg {
  color: var(--zen-cinnabar);
}

/* 东方破壁画卷与红杏互动画布容器 (Apricot Branch Canvas Container) */
.hero-visual-frame {
  position: relative;
  width: 100%;
  height: 440px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 园林白墙黛瓦边饰 */
.hero-visual-frame::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 14px;
  right: 14px;
  bottom: 14px;
  border: 1px solid var(--border-color);
  pointer-events: none;
  z-index: 2;
  border-radius: 8px;
}

#zenCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 1;
  cursor: crosshair;
}

.canvas-hint {
  position: absolute;
  bottom: 22px;
  right: 24px;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(252, 251, 249, 0.8);
  backdrop-filter: blur(4px);
  padding: 3px 10px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  z-index: 3;
  pointer-events: none;
  letter-spacing: 0.5px;
}

[data-theme="dark"] .canvas-hint {
  background: rgba(28, 31, 36, 0.8);
}

/* Hero 数据指标展示栏 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 56px;
  padding: 24px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}

.stat-item {
  text-align: center;
  border-right: 1px solid var(--border-light);
}

.stat-item:last-child {
  border-right: none;
}

.stat-num {
  font-size: 1.95rem;
  font-weight: 800;
  color: var(--zen-cinnabar);
  margin-bottom: 2px;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* 6. 核心优势 (3个图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 38px 30px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--zen-cinnabar);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(230, 57, 70, 0.3);
}

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

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: var(--zen-cinnabar-light);
  color: var(--zen-cinnabar);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  border: 1px solid rgba(230, 57, 70, 0.15);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 20px;
}

.feature-list {
  margin-top: auto;
  border-top: 1px solid var(--border-light);
  padding-top: 18px;
}

.feature-list-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

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

.feature-list-item svg {
  color: var(--zen-cinnabar);
  flex-shrink: 0;
}

/* 7. 全球专线节点与破壁穿墙微动效交互 (Wall-Piercing Interactive Showcase) */
.nodes-matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 26px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}

/* 破壁花瓣交互图层 */
.node-card .petal-burst {
  position: absolute;
  top: 0;
  right: 0;
  width: 60px;
  height: 60px;
  opacity: 0;
  transform: translate(20px, -20px) scale(0.6);
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
  color: var(--zen-cinnabar);
}

.node-card:hover {
  transform: translateY(-5px);
  border-color: var(--zen-cinnabar);
  box-shadow: 0 10px 24px -4px rgba(230, 57, 70, 0.18);
}

.node-card:hover .petal-burst {
  opacity: 0.85;
  transform: translate(0, 0) scale(1);
}

.node-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.node-flag-region {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-code {
  font-size: 0.85rem;
  font-weight: 800;
  padding: 3px 8px;
  background: var(--zen-cinnabar-light);
  color: var(--zen-cinnabar);
  border-radius: 4px;
  letter-spacing: 0.5px;
}

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

.node-latency-pill {
  font-size: 0.875rem;
  font-weight: 700;
  color: #10b981;
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 10px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.25s ease;
}

.node-card:hover .node-latency-pill {
  background: var(--zen-cinnabar);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(230, 57, 70, 0.3);
}

.node-specs {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.node-spec-row {
  display: flex;
  justify-content: space-between;
}

/* 8. 流媒体与 AI 支持图卡 (Showcase Cards) */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 38px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.showcase-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(230, 57, 70, 0.25);
}

.showcase-header {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 20px;
}

.showcase-icon-box {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  background: var(--zen-cinnabar);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(230, 57, 70, 0.3);
}

.showcase-title {
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-main);
}

.showcase-subtitle {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.showcase-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 26px;
}

.tag-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 26px;
}

.tag-item {
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 12px 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  transition: all 0.2s ease;
}

.tag-item:hover {
  border-color: var(--zen-cinnabar);
  background: var(--bg-card);
  transform: translateY(-2px);
}

.tag-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-main);
}

.tag-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.showcase-features-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--border-light);
}

.showcase-feature-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.showcase-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--zen-cinnabar);
  font-weight: 600;
  font-size: 0.8125rem;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--zen-cinnabar);
  box-shadow: 0 0 8px var(--zen-cinnabar);
}

/* 9. 套餐价格对比表 (参考真实市场价格架构) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 38px 30px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(230, 57, 70, 0.3);
}

/* 推荐热销款高亮卡片 */
.pricing-card.featured {
  border: 2px solid var(--zen-cinnabar);
  box-shadow: 0 12px 36px -4px rgba(230, 57, 70, 0.24);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--zen-cinnabar);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 4px 18px;
  border-radius: 9999px;
  box-shadow: 0 4px 10px rgba(230, 57, 70, 0.4);
}

.pricing-header {
  margin-bottom: 24px;
  text-align: center;
}

.pricing-plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.pricing-plan-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.pricing-price-box {
  margin: 20px 0 24px 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--zen-cinnabar);
}

.price-val {
  font-size: 3.1rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text-main);
  line-height: 1;
}

.price-cycle {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.pricing-features-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.pricing-feature-item svg {
  color: var(--zen-cinnabar);
  flex-shrink: 0;
}

.pricing-feature-item strong {
  color: var(--text-main);
}

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

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 30px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(230, 57, 70, 0.25);
}

.stars {
  display: flex;
  gap: 3px;
  color: #fbbf24;
  margin-bottom: 16px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}

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

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--zen-cinnabar-light);
  color: var(--zen-cinnabar);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  flex-shrink: 0;
  border: 1px solid rgba(230, 57, 70, 0.2);
}

.author-info h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-main);
}

.author-info p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* 11. 常见问题解答 (FAQ) */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.25s ease;
}

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

.faq-item details {
  width: 100%;
}

.faq-item summary {
  padding: 22px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  user-select: none;
}

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

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-card-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease, background 0.3s ease;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.faq-item details[open] .faq-icon {
  transform: rotate(180deg);
  background: var(--zen-cinnabar);
  color: #fff;
}

.faq-content {
  padding: 0 24px 22px 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-item details[open] .faq-content {
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
}

/* 12. 底部预呼吁横幅 (Pre-footer CTA Banner) */
.cta-banner {
  background: linear-gradient(135deg, #e63946 0%, #c1121f 100%);
  border-radius: 18px;
  padding: 60px 40px;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-cinnabar);
  margin-bottom: 80px;
}

.cta-banner h2 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-banner p {
  font-size: 1.125rem;
  opacity: 0.94;
  max-width: 640px;
  margin: 0 auto 32px auto;
  line-height: 1.6;
}

.cta-banner .btn-white {
  background: #ffffff;
  color: var(--zen-cinnabar);
  font-weight: 700;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
}

.cta-banner .btn-white:hover {
  background: #fdfaf6;
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
}

/* 13. 页脚 (严格只保留四个指定标题并打开新页面展示) */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 44px 0;
  margin-top: auto;
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color 0.2s ease, transform 0.2s ease;
  padding: 6px 14px;
  border-radius: 6px;
}

.footer-link:hover {
  color: var(--zen-cinnabar);
  background: var(--zen-cinnabar-light);
  transform: translateY(-1px);
}

.footer-copyright {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* 14. 推荐资讯专属页面排版样式 (News & Insights) */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 40px;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 34px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.news-card:hover {
  transform: translateY(-5px);
  border-color: var(--zen-cinnabar);
  box-shadow: var(--shadow-md);
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.news-tag {
  background: var(--zen-cinnabar-light);
  color: var(--zen-cinnabar);
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.news-title {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 14px;
  color: var(--text-main);
}

.news-excerpt {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 22px;
  flex-grow: 1;
}

.news-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
  font-size: 0.875rem;
  color: var(--zen-cinnabar);
  font-weight: 600;
}

/* 15. 子页面通用排版样式 (About / Terms / Privacy / Sitemap) */
.page-header {
  padding: 64px 0 44px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card-elevated);
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.page-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

.article-content {
  max-width: 860px;
  margin: 44px auto 80px auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 48px;
  box-shadow: var(--shadow-sm);
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 32px 0 16px 0;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.article-content p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-content ul, .article-content ol {
  margin: 16px 0 24px 20px;
  color: var(--text-secondary);
}

.article-content li {
  margin-bottom: 10px;
  line-height: 1.7;
}

.article-alert {
  padding: 18px 20px;
  border-radius: 8px;
  margin: 24px 0;
  font-size: 0.95rem;
  line-height: 1.6;
}

.article-alert-info {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: #059669;
}

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

.article-alert-warning {
  background: var(--zen-cinnabar-light);
  border: 1px solid rgba(230, 57, 70, 0.25);
  color: var(--zen-cinnabar);
}

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

.sitemap-card {
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 24px;
}

.sitemap-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sitemap-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.sitemap-card a {
  color: var(--zen-cinnabar);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sitemap-card a:hover {
  text-decoration: underline;
}

/* 15.5 深度长篇科普文章专业排版系统 (SEO Long-form Article System) */
.article-header {
  margin-bottom: 36px;
  text-align: center;
}

.article-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-main);
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-size: 0.875rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-tag {
  background: var(--zen-cinnabar-light);
  color: var(--zen-cinnabar);
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 600;
}

/* 文章目录 (Table of Contents) */
.article-toc {
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--zen-cinnabar);
  border-radius: 8px;
  padding: 24px 28px;
  margin: 32px 0 40px 0;
}

.article-toc h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc ol {
  margin: 0;
  padding-left: 20px;
}

.article-toc li {
  margin-bottom: 8px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.article-toc a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s ease;
}

.article-toc a:hover {
  color: var(--zen-cinnabar);
  text-decoration: underline;
}

/* 文章正文与多级标题 */
.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 44px 0 18px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h2::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 20px;
  background: var(--zen-cinnabar);
  border-radius: 3px;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 28px 0 12px 0;
}

.article-body p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 18px;
}

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

.article-body ul, .article-body ol {
  margin: 16px 0 24px 24px;
  color: var(--text-secondary);
}

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

/* 文章内比对表格 (Comparison Table) */
.article-table-wrapper {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border-color);
  border-radius: 10px;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.925rem;
}

.article-table th {
  background: var(--bg-card-elevated);
  color: var(--text-main);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}

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

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

.article-table tr:hover td {
  background: var(--bg-card-hover);
}

/* 文中呼吁注册引导框 (In-article CTA Box) */
.article-cta-box {
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.06) 0%, rgba(201, 154, 94, 0.06) 100%);
  border: 1px solid rgba(230, 57, 70, 0.25);
  border-radius: 14px;
  padding: 32px;
  margin: 40px 0;
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

.article-cta-box p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 20px auto;
}

/* 文章专属常见问题 (Article FAQ Section) */
.article-faq-section {
  margin-top: 48px;
  padding-top: 36px;
  border-top: 2px dashed var(--border-color);
}

.article-faq-section h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 22px;
}

/* 文章相关阅读 (Related Reading Section) */
.related-reading-section {
  margin-top: 48px;
  padding-top: 36px;
  border-top: 2px dashed var(--border-color);
}

.related-reading-section h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 22px;
}

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

.related-card {
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
}

.related-card:hover {
  border-color: var(--zen-cinnabar);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

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

.related-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.related-card .read-link {
  font-size: 0.85rem;
  color: var(--zen-cinnabar);
  font-weight: 600;
}

/* 16. 响应式适配媒体查询 (@media) */
@media (max-width: 1024px) {
  .hero-grid-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-visual-frame {
    height: 360px;
  }
  .hero-headline {
    font-size: 2.8rem;
  }
  .features-grid,
  .pricing-grid,
  .nodes-matrix,
  .testimonials-grid,
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }
  .container {
    padding: 0 18px;
  }
  .nav-links {
    display: none; /* 移动端精简模式 */
  }
  .hero-headline {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .hero-visual-frame {
    height: 280px;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 20px;
  }
  .stat-item:nth-child(2) {
    border-right: none;
  }
  .stat-item {
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 12px;
  }
  .stat-item:nth-child(3),
  .stat-item:nth-child(4) {
    border-bottom: none;
    padding-bottom: 0;
  }
  .features-grid,
  .showcase-grid,
  .pricing-grid,
  .nodes-matrix,
  .testimonials-grid,
  .news-grid,
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  .tag-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .btn-lg {
    width: 100%;
    padding: 14px 20px;
  }
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta .btn {
    width: 100%;
  }
  .footer-nav {
    gap: 16px;
    flex-direction: column;
  }
  .article-content {
    padding: 24px;
    border-radius: 12px;
  }
  .cta-banner {
    padding: 40px 20px;
  }
  .cta-banner h2 {
    font-size: 1.75rem;
  }
}