/* ===================================================================
   极速云 (Jisu Cloud) - Swiss Modernist Bauhaus Geometric-Split UI
   国际主义平面设计风格 / 包豪斯理性几何网格体系
   色彩：纸白 (#ffffff), 印刷浓墨黑 (#0f0f11), 信号警示黄 (#facc15), 载波钴蓝 (#0284c7)
   特性：零 AI 伪光斑、严苛非对称网格、0ms 瞬间几何反色微交互、全端强响应
   =================================================================== */

/* -------------------------------------------------------------------
   1. 设计令牌 (Design Tokens) - 瑞士包豪斯理性色彩体系
   ------------------------------------------------------------------- */
:root {
  /* 基础排印字体栈：纯粹的无衬线新怪诞风格 (Neo-Grotesque) */
  --font-grotesk: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", "Roboto Mono", Consolas, monospace;

  /* 包豪斯核心色彩 (Bauhaus Core Palette) */
  --signal-yellow: #facc15;       /* 信号亮黄 - 象征雷电极速 */
  --signal-yellow-hover: #eab308;
  --carrier-blue: #0284c7;        /* 载波钴蓝 - 象征全球链路 */
  --carrier-blue-dark: #0369a1;
  --carrier-blue-light: #e0f2fe;

  /* 白天模式：冷调纸白与高对比浓黑 */
  --bg-page: #f8f9fa;
  --bg-surface: #ffffff;
  --bg-surface-alt: #f1f3f5;
  --bg-surface-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.94);

  --ink-primary: #0f0f11;         /* 印刷浓墨黑 */
  --ink-secondary: #374151;       /* 次级阅读灰黑 */
  --ink-muted: #6b7280;           /* 标注说明浅墨 */
  --ink-inverse: #ffffff;

  --border-stark: #0f0f11;        /* 瑞士栅格刚性黑色边框 */
  --border-light: #e5e7eb;
  --border-focus: #0284c7;

  /* 硬边缘无模糊阴影 (Bauhaus Sharp Offset Shadows) */
  --shadow-sharp-sm: 2px 2px 0px #0f0f11;
  --shadow-sharp-md: 4px 4px 0px #0f0f11;
  --shadow-sharp-lg: 6px 6px 0px #0f0f11;
  --shadow-sharp-yellow: 4px 4px 0px #facc15;
  --shadow-sharp-blue: 4px 4px 0px #0284c7;

  /* 边角：包豪斯理性直角与微倒角 */
  --radius-sharp: 0px;
  --radius-subtle: 3px;
  --radius-tag: 2px;

  /* 0ms 瞬间微交互与平滑主题过渡 */
  --snap-transition: 0ms;
  --theme-transition: background-color 0.25s cubic-bezier(0.16, 1, 0.3, 1), color 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
}

/* 暗夜模式：深邃夜幕浓墨与高饱和信号色 */
[data-theme="dark"] {
  --bg-page: #0a0b0e;
  --bg-surface: #12141a;
  --bg-surface-alt: #1a1d26;
  --bg-surface-elevated: #1e222e;
  --bg-glass: rgba(18, 20, 26, 0.94);

  --ink-primary: #f9fafb;
  --ink-secondary: #d1d5db;
  --ink-muted: #9ca3af;
  --ink-inverse: #0a0b0e;

  --border-stark: #374151;
  --border-light: #262c3a;
  --border-focus: #38bdf8;

  --carrier-blue: #38bdf8;
  --carrier-blue-dark: #0284c7;
  --carrier-blue-light: rgba(56, 189, 248, 0.12);

  --shadow-sharp-sm: 2px 2px 0px #facc15;
  --shadow-sharp-md: 4px 4px 0px #facc15;
  --shadow-sharp-lg: 6px 6px 0px #38bdf8;
  --shadow-sharp-yellow: 4px 4px 0px #facc15;
  --shadow-sharp-blue: 4px 4px 0px #38bdf8;
}

/* -------------------------------------------------------------------
   2. 全局重置与排版规范
   ------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-grotesk);
  background-color: var(--bg-page);
  color: var(--ink-primary);
  line-height: 1.58;
  transition: var(--theme-transition);
  overflow-x: hidden;
  background-image: 
    linear-gradient(to right, var(--border-light) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border-light) 1px, transparent 1px);
  background-size: 64px 64px;
}

[data-theme="dark"] body {
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--snap-transition);
}

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

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

/* 瑞士版面容器网格 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
}

/* -------------------------------------------------------------------
   3. 双色几何对角分割装饰条 (Geometric-Split Planes)
   ------------------------------------------------------------------- */
.split-strip {
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--carrier-blue) 0%, var(--carrier-blue) 50%, var(--signal-yellow) 50%, var(--signal-yellow) 100%);
  display: block;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  background: var(--bg-surface-alt);
  color: var(--ink-secondary);
  border: 1px solid var(--border-stark);
}

/* -------------------------------------------------------------------
   4. 导航栏 (Header & Navbar)
   ------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--border-stark);
  transition: var(--theme-transition);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

/* 品牌 Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--ink-primary);
  text-transform: uppercase;
}

.brand-logo-img {
  width: 38px;
  height: 38px;
  object-fit: contain;
  transition: transform 120ms ease;
}

.brand-logo:hover .brand-logo-img {
  transform: rotate(-10deg) scale(1.08);
}

.brand-subtext {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--carrier-blue);
  background: var(--carrier-blue-light);
  padding: 2px 6px;
  border: 1px solid var(--carrier-blue);
  margin-left: 4px;
}

/* 导航链接集合 (包含首页、各锚点、推荐资讯入口) */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--ink-secondary);
  padding: 8px 14px;
  border: 1px solid transparent;
  transition: all var(--snap-transition);
  position: relative;
  letter-spacing: -0.01em;
}

.nav-link:hover, .nav-link.active {
  background: var(--ink-primary);
  color: var(--ink-inverse);
  border-color: var(--border-stark);
}

/* 推荐资讯高亮徽标项 */
.nav-link-news {
  position: relative;
  border: 1px solid var(--border-stark);
  background: var(--signal-yellow);
  color: #0f0f11 !important;
  font-weight: 800;
  box-shadow: 2px 2px 0px var(--border-stark);
}

.nav-link-news:hover {
  background: #0f0f11 !important;
  color: var(--signal-yellow) !important;
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--signal-yellow);
}

.news-dot {
  width: 6px;
  height: 6px;
  background: #ef4444;
  border-radius: 50%;
  display: inline-block;
  margin-right: 4px;
  animation: blink 1.2s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.2; }
}

/* 顶部操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 昼夜模式切换按钮（极简包豪斯方形几何质感，带物理微触感） */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  background: var(--bg-surface);
  border: 2px solid var(--border-stark);
  color: var(--ink-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 120ms ease;
  box-shadow: var(--shadow-sharp-sm);
  cursor: pointer;
}

.theme-toggle-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-sharp-md);
  background: var(--signal-yellow);
  color: #0f0f11;
}

.theme-toggle-btn:active {
  transform: translate(0, 0);
  box-shadow: 0 0 0 transparent;
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
}

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

/* 移动端汉堡折叠按钮 */
.mobile-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  background: var(--bg-surface);
  border: 2px solid var(--border-stark);
  color: var(--ink-primary);
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sharp-sm);
}

/* -------------------------------------------------------------------
   5. 按钮系统 (Bauhaus Buttons)
   ------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 800;
  font-size: 0.95rem;
  padding: 12px 24px;
  border: 2px solid var(--border-stark);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  transition: transform 100ms ease, box-shadow 100ms ease, background 100ms ease;
}

.btn-primary {
  background: var(--signal-yellow);
  color: #0f0f11;
  box-shadow: var(--shadow-sharp-md);
}

.btn-primary:hover {
  background: #fef08a;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-sharp-lg);
  color: #0f0f11;
}

.btn-primary:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--border-stark);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--ink-primary);
  box-shadow: var(--shadow-sharp-md);
}

.btn-secondary:hover {
  background: var(--ink-primary);
  color: var(--ink-inverse);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-sharp-lg);
}

.btn-secondary:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--border-stark);
}

.btn-cobalt {
  background: var(--carrier-blue);
  color: #ffffff;
  box-shadow: var(--shadow-sharp-md);
}

.btn-cobalt:hover {
  background: var(--carrier-blue-dark);
  color: #ffffff;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-sharp-lg);
}

.btn-lg {
  padding: 15px 32px;
  font-size: 1.05rem;
}

/* -------------------------------------------------------------------
   6. 瑞士主视觉区 (Swiss Geometric Hero Section)
   ------------------------------------------------------------------- */
.hero-section {
  padding: 70px 0 60px;
  border-bottom: 2px solid var(--border-stark);
  background: var(--bg-surface);
  position: relative;
}

/* 非对称海报网格结构 */
.hero-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: stretch;
}

.hero-main-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-meta-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.meta-code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 3px 8px;
  background: var(--ink-primary);
  color: var(--ink-inverse);
}

.meta-status {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--carrier-blue);
  border-bottom: 2px solid var(--carrier-blue);
}

/* 瑞士大字体排版 */
.hero-title {
  font-size: 3.5rem;
  font-weight: 950;
  line-height: 1.1;
  letter-spacing: -0.04em;
  color: var(--ink-primary);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero-title-highlight {
  position: relative;
  display: inline-block;
  background: var(--signal-yellow);
  color: #0f0f11;
  padding: 0 10px;
  border: 2px solid var(--border-stark);
  box-shadow: var(--shadow-sharp-md);
  margin-top: 6px;
}

.hero-title-subline {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--carrier-blue);
  display: block;
  margin-top: 8px;
  letter-spacing: -0.02em;
}

.hero-intro {
  font-size: 1.15rem;
  line-height: 1.75;
  color: var(--ink-secondary);
  margin-bottom: 34px;
  border-left: 4px solid var(--border-stark);
  padding-left: 18px;
  max-width: 650px;
}

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

/* 右侧海报式几何卡片 (Geometric Poster Card) */
.hero-poster-card {
  border: 2px solid var(--border-stark);
  background: var(--bg-surface-alt);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sharp-lg);
  overflow: hidden;
}

.poster-header {
  padding: 14px 20px;
  background: var(--ink-primary);
  color: var(--ink-inverse);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
}

.poster-header-dots {
  display: flex;
  gap: 6px;
}

.poster-dot {
  width: 10px;
  height: 10px;
  border: 1px solid var(--ink-inverse);
}

.poster-dot.yellow { background: var(--signal-yellow); }
.poster-dot.blue { background: var(--carrier-blue); }

.poster-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* 0ms 瞬间双色反色微交互节点列表 (Instantaneous 0ms Graphic Snap) */
.snap-node-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.snap-node-item {
  display: grid;
  grid-template-columns: 80px 1fr 90px;
  align-items: center;
  padding: 12px 14px;
  background: var(--bg-surface);
  border: 1.5px solid var(--border-stark);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-primary);
  cursor: pointer;
  user-select: none;
  /* 0ms 瞬间无延迟响应 */
  transition: transform 0ms, background 0ms, color 0ms;
}

/* 悬停瞬间 0ms 双块反转！一半载波蓝，一半信号黄，高对比黑字 */
.snap-node-item:hover {
  background: linear-gradient(90deg, var(--carrier-blue) 0%, var(--carrier-blue) 65%, var(--signal-yellow) 65%, var(--signal-yellow) 100%);
  color: #0f0f11;
  border-color: #0f0f11;
  transform: translateX(-4px);
  box-shadow: 4px 4px 0px #0f0f11;
}

.snap-node-item:hover .node-region {
  color: #ffffff;
  font-weight: 800;
}

.snap-node-item:hover .node-tag {
  color: #ffffff;
}

.snap-node-item:hover .node-ping {
  color: #0f0f11;
  font-weight: 900;
}

.node-region {
  font-weight: 800;
}

.node-tag {
  color: var(--ink-muted);
}

.node-ping {
  text-align: right;
  color: var(--carrier-blue);
}

.poster-footer-spec {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 2px solid var(--border-stark);
  background: var(--bg-surface);
}

.spec-cell {
  padding: 14px;
  border-right: 1px solid var(--border-stark);
  text-align: center;
}

.spec-cell:last-child {
  border-right: none;
}

.spec-cell-num {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--ink-primary);
}

.spec-cell-label {
  font-size: 0.75rem;
  color: var(--ink-muted);
  font-weight: 700;
  text-transform: uppercase;
}

/* -------------------------------------------------------------------
   7. 结构化区块标题体系
   ------------------------------------------------------------------- */
.section-wrapper {
  padding: 80px 0;
  position: relative;
  border-bottom: 2px solid var(--border-stark);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 44px;
  border-bottom: 2px solid var(--border-stark);
  padding-bottom: 20px;
  flex-wrap: wrap;
  gap: 16px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--carrier-blue);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.section-heading {
  font-size: 2.3rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--ink-primary);
  line-height: 1.2;
}

.section-desc-right {
  max-width: 480px;
  font-size: 1rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

/* -------------------------------------------------------------------
   8. 核心优势图卡 (3大包豪斯结构卡片)
   ------------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-box {
  background: var(--bg-surface);
  border: 2px solid var(--border-stark);
  box-shadow: var(--shadow-sharp-md);
  display: flex;
  flex-direction: column;
  transition: transform 120ms ease, box-shadow 120ms ease;
  position: relative;
}

.feature-box:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-sharp-lg);
}

.feature-box-top {
  padding: 20px 24px;
  border-bottom: 2px solid var(--border-stark);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-surface-alt);
}

.feature-num {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--ink-primary);
}

.feature-icon-badge {
  width: 42px;
  height: 42px;
  border: 2px solid var(--border-stark);
  background: var(--signal-yellow);
  color: #0f0f11;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-box-body {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 850;
  margin-bottom: 12px;
  color: var(--ink-primary);
  letter-spacing: -0.02em;
}

.feature-desc {
  font-size: 0.96rem;
  color: var(--ink-secondary);
  line-height: 1.68;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-checklist {
  list-style: none;
  border-top: 1px dashed var(--border-stark);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-secondary);
}

.check-bullet {
  width: 8px;
  height: 8px;
  background: var(--carrier-blue);
  flex-shrink: 0;
}

/* -------------------------------------------------------------------
   9. 流媒体图卡 & AI 支持图卡 (双栏几何海报结构)
   ------------------------------------------------------------------- */
.showcase-split-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-plane {
  background: var(--bg-surface);
  border: 2px solid var(--border-stark);
  box-shadow: var(--shadow-sharp-md);
  display: flex;
  flex-direction: column;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.showcase-plane:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-sharp-lg);
}

.showcase-head-bar {
  padding: 14px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  border-bottom: 2px solid var(--border-stark);
}

.media-bar {
  background: var(--signal-yellow);
  color: #0f0f11;
}

.ai-bar {
  background: var(--carrier-blue);
  color: #ffffff;
}

.showcase-content {
  padding: 30px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.showcase-title {
  font-size: 1.65rem;
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--ink-primary);
  letter-spacing: -0.02em;
}

.showcase-desc {
  font-size: 0.98rem;
  color: var(--ink-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

/* 矩阵徽标标签 */
.matrix-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.matrix-tag {
  font-size: 0.88rem;
  font-weight: 700;
  padding: 8px 14px;
  border: 1.5px solid var(--border-stark);
  background: var(--bg-surface-alt);
  color: var(--ink-primary);
  transition: background 0ms, color 0ms;
}

.matrix-tag:hover {
  background: var(--ink-primary);
  color: var(--ink-inverse);
}

.showcase-metric-box {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  border: 1.5px solid var(--border-stark);
  background: var(--bg-surface-alt);
  padding: 16px;
  margin-top: auto;
}

.metric-unit-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  font-weight: 700;
}

.metric-unit-val {
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--ink-primary);
  margin-top: 2px;
}

/* -------------------------------------------------------------------
   10. 套餐价格表 (真实市场价格体系 & 刚性对比表)
   ------------------------------------------------------------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.pricing-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-stark);
  box-shadow: var(--shadow-sharp-md);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.pricing-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-sharp-lg);
}

/* 热门主推卡片加粗边框并带信号黄徽标 */
.pricing-card.featured {
  border: 3px solid var(--carrier-blue);
  box-shadow: var(--shadow-sharp-blue);
}

.featured-flag {
  position: absolute;
  top: -14px;
  right: 18px;
  background: var(--signal-yellow);
  color: #0f0f11;
  border: 2px solid var(--border-stark);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 900;
  padding: 2px 10px;
  text-transform: uppercase;
  box-shadow: 2px 2px 0px var(--border-stark);
}

.pricing-card-header {
  padding: 28px 24px 20px;
  border-bottom: 2px solid var(--border-stark);
}

.pricing-tier-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--carrier-blue);
  text-transform: uppercase;
}

.pricing-name {
  font-size: 1.55rem;
  font-weight: 900;
  color: var(--ink-primary);
  margin: 4px 0 16px;
}

/* 真实价格数值展示 */
.price-display {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--ink-primary);
}

.price-integer {
  font-size: 3.2rem;
  font-weight: 950;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--ink-primary);
}

.price-period {
  font-size: 0.9rem;
  color: var(--ink-muted);
  font-weight: 700;
}

.price-sub-note {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin-top: 6px;
}

.pricing-features-list {
  padding: 24px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex-grow: 1;
}

.price-feature-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--ink-secondary);
}

.price-feature-row.strong {
  color: var(--ink-primary);
  font-weight: 800;
}

.price-feature-row svg {
  flex-shrink: 0;
  color: var(--carrier-blue);
}

.pricing-card-action {
  padding: 0 24px 28px;
}

.pricing-card-action .btn {
  width: 100%;
}

/* 规格完整比对表格 (Rational Comparison Table) */
.comparison-matrix {
  margin-top: 48px;
  border: 2px solid var(--border-stark);
  background: var(--bg-surface);
  box-shadow: var(--shadow-sharp-md);
  overflow-x: auto;
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.matrix-table th, .matrix-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-stark);
  border-right: 1px solid var(--border-light);
}

.matrix-table th:last-child, .matrix-table td:last-child {
  border-right: none;
}

.matrix-table th {
  background: var(--bg-surface-alt);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--ink-primary);
  border-bottom: 2px solid var(--border-stark);
}

.matrix-table tr:hover td {
  background: var(--carrier-blue-light);
}

.col-accent {
  background: rgba(250, 204, 21, 0.08);
}

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

.review-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-stark);
  box-shadow: var(--shadow-sharp-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: transform 120ms ease;
}

.review-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-sharp-lg);
}

.review-meta-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.review-stars {
  font-size: 1rem;
  color: #0f0f11;
  background: var(--signal-yellow);
  padding: 2px 6px;
  border: 1px solid var(--border-stark);
  font-weight: 900;
}

.review-quote {
  font-size: 0.96rem;
  color: var(--ink-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.review-user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1.5px solid var(--border-stark);
  padding-top: 14px;
}

.user-monogram {
  width: 38px;
  height: 38px;
  background: var(--carrier-blue);
  color: #ffffff;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--border-stark);
}

.user-name {
  font-weight: 800;
  color: var(--ink-primary);
  font-size: 0.95rem;
}

.user-role {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-muted);
}

/* -------------------------------------------------------------------
   12. 常见问题解答 (FAQ)
   ------------------------------------------------------------------- */
.faq-box-group {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-card {
  border: 2px solid var(--border-stark);
  background: var(--bg-surface);
  box-shadow: var(--shadow-sharp-sm);
  transition: border-color var(--snap-transition);
}

.faq-header {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--ink-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

.faq-header:hover {
  background: var(--bg-surface-alt);
}

.faq-sign {
  width: 24px;
  height: 24px;
  border: 1.5px solid var(--border-stark);
  background: var(--signal-yellow);
  color: #0f0f11;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 1rem;
  flex-shrink: 0;
  transition: transform 120ms ease;
}

.faq-card[open] .faq-sign {
  transform: rotate(45deg);
  background: var(--carrier-blue);
  color: #ffffff;
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.96rem;
  color: var(--ink-secondary);
  line-height: 1.75;
  border-top: 1px dashed var(--border-light);
  padding-top: 14px;
}

/* 底部行动号召巨幅海报条 */
.cta-poster-strip {
  margin-top: 50px;
  border: 3px solid var(--border-stark);
  background: linear-gradient(135deg, var(--carrier-blue) 0%, var(--carrier-blue) 60%, var(--carrier-blue-dark) 100%);
  color: #ffffff;
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-sharp-lg);
  flex-wrap: wrap;
  gap: 24px;
}

.cta-poster-text h3 {
  font-size: 2.2rem;
  font-weight: 950;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.cta-poster-text p {
  font-size: 1.05rem;
  opacity: 0.92;
}

.cta-poster-strip .btn-primary {
  background: var(--signal-yellow);
  color: #0f0f11;
  font-size: 1.05rem;
  padding: 16px 36px;
}

/* -------------------------------------------------------------------
   13. 规范页脚 (严格只保留四个标题，新页面打开)
   ------------------------------------------------------------------- */
.footer {
  background: var(--bg-surface);
  border-top: 2px solid var(--border-stark);
  padding: 44px 0 32px;
  margin-top: 60px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1rem;
  font-weight: 800;
  color: var(--ink-primary);
  border: 1.5px solid var(--border-stark);
  padding: 8px 18px;
  background: var(--bg-surface-alt);
  box-shadow: 2px 2px 0px var(--border-stark);
  transition: all 100ms ease;
}

.footer-link:hover {
  background: var(--signal-yellow);
  color: #0f0f11;
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0px var(--border-stark);
}

.footer-copyright {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-muted);
}

/* -------------------------------------------------------------------
   14. 内页与独立页面样式 (资讯文章、关于、条款等)
   ------------------------------------------------------------------- */
.doc-box {
  background: var(--bg-surface);
  border: 2px solid var(--border-stark);
  box-shadow: var(--shadow-sharp-md);
  padding: 44px;
  margin: 40px auto 60px;
  max-width: 940px;
}

.doc-box h2 {
  font-size: 1.55rem;
  font-weight: 900;
  color: var(--ink-primary);
  margin: 32px 0 14px;
  border-bottom: 2px solid var(--border-stark);
  padding-bottom: 8px;
}

.doc-box p {
  font-size: 1rem;
  color: var(--ink-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.doc-box ul, .doc-box ol {
  padding-left: 24px;
  margin-bottom: 20px;
  color: var(--ink-secondary);
  font-size: 0.98rem;
  line-height: 1.75;
}

/* 资讯专栏卡片栅格 */
.news-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 36px;
}

.news-card {
  border: 2px solid var(--border-stark);
  background: var(--bg-surface);
  box-shadow: var(--shadow-sharp-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: transform 120ms ease;
}

.news-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-sharp-lg);
}

.news-card-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--carrier-blue);
  font-weight: 700;
  margin-bottom: 8px;
}

.news-card-title {
  font-size: 1.25rem;
  font-weight: 850;
  color: var(--ink-primary);
  margin-bottom: 12px;
  line-height: 1.35;
}

.news-card-excerpt {
  font-size: 0.92rem;
  color: var(--ink-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
  flex-grow: 1;
}

.news-card-tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  background: var(--signal-yellow);
  color: #0f0f11;
  border: 1px solid var(--border-stark);
}

/* -------------------------------------------------------------------
   15. 响应式媒体查询 (@media 查询，手机端单栏严苛适配)
   ------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

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

  .hero-title {
    font-size: 2.85rem;
  }
}

@media (max-width: 768px) {
  .header-container {
    height: 66px;
  }

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

  .nav-menu {
    position: fixed;
    top: 66px;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 2px solid var(--border-stark);
    flex-direction: column;
    padding: 20px;
    gap: 10px;
    transform: translateY(-130%);
    opacity: 0;
    pointer-events: none;
    transition: transform 180ms ease, opacity 180ms ease;
    box-shadow: var(--shadow-sharp-lg);
  }

  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    width: 100%;
    text-align: center;
    border: 1px solid var(--border-light);
  }

  .header-actions .btn-primary {
    display: none;
  }

  .hero-section {
    padding: 44px 0 36px;
  }

  .hero-title {
    font-size: 2.15rem;
  }

  .hero-title-subline {
    font-size: 1.25rem;
  }

  .hero-intro {
    font-size: 1rem;
    padding-left: 12px;
  }

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

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

  /* 手机端完美单栏 */
  .features-grid,
  .showcase-split-grid,
  .pricing-grid,
  .reviews-grid,
  .news-cards-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .comparison-matrix {
    display: none; /* 手机端隐藏过宽对比表，依靠卡片清单 */
  }

  .cta-poster-strip {
    padding: 28px 20px;
    flex-direction: column;
    text-align: center;
  }

  .cta-poster-strip .btn {
    width: 100%;
    min-height: 50px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 12px;
  }

  .footer-link {
    width: 100%;
    text-align: center;
  }

  .doc-box {
    padding: 22px 16px;
  }
}

/* -------------------------------------------------------------------
   16. SEO 深度长篇科普文章专属排版规范 (Article, TOC, FAQ, Related)
   ------------------------------------------------------------------- */
.article-header {
  margin-bottom: 32px;
  border-bottom: 2px solid var(--border-stark);
  padding-bottom: 24px;
}

.article-breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.article-breadcrumbs a {
  color: var(--carrier-blue);
  text-decoration: underline;
}

.article-meta-tags {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}

/* 目录 (TOC - Table of Contents) */
.article-toc {
  background: var(--bg-surface-alt);
  border: 2px solid var(--border-stark);
  box-shadow: var(--shadow-sharp-sm);
  padding: 24px;
  margin: 32px 0;
}

.article-toc-title {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 900;
  color: #0f0f11;
  background: var(--signal-yellow);
  padding: 4px 12px;
  border: 1.5px solid var(--border-stark);
  display: inline-block;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.article-toc-list {
  list-style: decimal inside;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.article-toc-list a {
  color: var(--ink-primary);
  border-bottom: 1px dotted var(--border-stark);
  transition: all var(--snap-transition);
}

.article-toc-list a:hover {
  background: var(--carrier-blue);
  color: #ffffff;
  padding: 1px 4px;
}

/* 正文深色代码与引言块 */
.article-callout {
  border-left: 4px solid var(--carrier-blue);
  background: var(--carrier-blue-light);
  padding: 18px 22px;
  margin: 24px 0;
  font-size: 0.98rem;
  color: var(--ink-primary);
}

.article-callout.warning {
  border-left-color: #ef4444;
  background: rgba(239, 68, 68, 0.08);
}

.article-callout.highlight {
  border-left-color: var(--signal-yellow);
  background: rgba(250, 204, 21, 0.12);
}

.article-internal-link {
  color: var(--carrier-blue);
  font-weight: 800;
  text-decoration: underline;
  padding: 0 4px;
}

.article-internal-link:hover {
  background: var(--signal-yellow);
  color: #0f0f11;
}

/* 相关阅读网格 (Related Reading) */
.related-box {
  margin-top: 50px;
  border-top: 2px solid var(--border-stark);
  padding-top: 36px;
}

.related-title {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--ink-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.related-card {
  border: 1.5px solid var(--border-stark);
  background: var(--bg-surface-alt);
  padding: 18px;
  display: flex;
  flex-direction: column;
  transition: transform 100ms ease;
}

.related-card:hover {
  transform: translate(-2px, -2px);
  background: var(--bg-surface);
  box-shadow: var(--shadow-sharp-sm);
}

.related-card-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--ink-primary);
  margin-bottom: 8px;
}

.related-card-desc {
  font-size: 0.88rem;
  color: var(--ink-muted);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
}