/* ==========================================================================
   极速云 (JisuCloud) - Apple-grade Refined Daylight Minimalism
   设计系统：极简纯白 · 钛灰质感 · 锋利排版 · 经典海洋蓝 · 零非必要图标
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 设计变量系统 (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* 白天模式：Apple Daylight 纯净美学 */
  --bg-primary: #ffffff;
  --bg-surface: #f5f5f7;
  --bg-surface-elevated: #ffffff;
  --bg-acrylic: rgba(255, 255, 255, 0.78);
  --bg-acrylic-border: rgba(0, 0, 0, 0.08);

  --text-primary: #1d1d1f;
  --text-secondary: #515154;
  --text-muted: #86868b;
  --text-on-accent: #ffffff;

  --accent-color: #0066cc;
  --accent-hover: #0077ed;
  --accent-subtle: rgba(0, 102, 204, 0.08);
  --accent-border: rgba(0, 102, 204, 0.25);

  --border-light: rgba(0, 0, 0, 0.08);
  --border-subtle: rgba(0, 0, 0, 0.04);
  --border-focus: #0066cc;

  /* 柔和扩散阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 20px 48px rgba(0, 102, 204, 0.12);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 980px;

  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.2s var(--ease-smooth);
  --transition-normal: 0.32s var(--ease-spring);
}

/* 昼夜模式：钛黑暗夜模式 (Dark Mode) */
[data-theme="dark"] {
  --bg-primary: #000000;
  --bg-surface: #161617;
  --bg-surface-elevated: #1d1d1f;
  --bg-acrylic: rgba(22, 22, 23, 0.82);
  --bg-acrylic-border: rgba(255, 255, 255, 0.12);

  --text-primary: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-muted: #6e6e73;
  --text-on-accent: #ffffff;

  --accent-color: #2997ff;
  --accent-hover: #47a6ff;
  --accent-subtle: rgba(41, 151, 255, 0.12);
  --accent-border: rgba(41, 151, 255, 0.3);

  --border-light: rgba(255, 255, 255, 0.12);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-focus: #2997ff;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.7);
  --shadow-hover: 0 20px 48px rgba(41, 151, 255, 0.2);
}

/* --------------------------------------------------------------------------
   2. 基础重置与苹果级排版
   -------------------------------------------------------------------------- */
*, *::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, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
}

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

/* --------------------------------------------------------------------------
   3. 顶部粘滞导航栏 (Header / Navigation)
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-acrylic);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.logo-symbol {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 2px;
  transition: color var(--transition-fast);
}

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

.nav-link-badge {
  font-size: 0.7rem;
  background: var(--accent-subtle);
  color: var(--accent-color);
  padding: 1px 6px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  margin-left: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* --------------------------------------------------------------------------
   4. 精致透明化昼夜模式切换按钮 (Theme Toggle)
   -------------------------------------------------------------------------- */
.theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-pill);
  background: var(--bg-acrylic);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  position: relative;
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-color);
  transform: scale(1.04);
}

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

.icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.6);
}

[data-theme="dark"] .icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.6);
}

[data-theme="dark"] .icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* --------------------------------------------------------------------------
   5. 苹果标准按钮体系
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 9px 20px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  white-space: nowrap;
  min-height: 40px;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--accent-color);
  color: #ffffff !important;
  box-shadow: 0 2px 8px rgba(0, 102, 204, 0.2);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  box-shadow: 0 4px 16px rgba(0, 102, 204, 0.35);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  background-color: var(--bg-surface-elevated);
  border-color: rgba(0, 0, 0, 0.15);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 13px 28px;
  font-size: 1.02rem;
  min-height: 48px;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.84rem;
  min-height: 34px;
}

.mobile-menu-toggle {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   6. 主视觉区 (Hero Section - 包含大标题品牌名与详细简介)
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 88px 0 56px;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #34c759;
}

.hero-title {
  font-size: 3.6rem;
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.hero-title .brand-highlight {
  color: var(--accent-color);
}

.hero-intro {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 34px;
  line-height: 1.68;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 48px;
}

/* --------------------------------------------------------------------------
   7. 浮动亚克力低延迟仪表盘 (Acrylic Latency Dashboard)
      + 极简平滑搜索输入框 (Instant Server Filter)
   -------------------------------------------------------------------------- */
.dashboard-wrapper {
  max-width: 960px;
  margin: 0 auto;
  background: var(--bg-acrylic);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  border: 1px solid var(--bg-acrylic-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.dashboard-wrapper:hover {
  box-shadow: var(--shadow-hover);
}

.dashboard-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-light);
  gap: 16px;
  flex-wrap: wrap;
}

.dashboard-status-indicator {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.indicator-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #34c759;
  box-shadow: 0 0 0 3px rgba(52, 199, 89, 0.2);
}

/* 极简扩展式搜索框 (Minimalist Search Input) */
.search-box-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.server-search-input {
  width: 200px;
  height: 36px;
  padding: 0 14px 0 34px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-light);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.84rem;
  outline: none;
  transition: width 0.35s var(--ease-spring), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.server-search-input:focus {
  width: 290px;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}

.search-icon-svg {
  position: absolute;
  left: 12px;
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  pointer-events: none;
}

.dashboard-columns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background-color: var(--border-light);
}

.column-card {
  background-color: var(--bg-primary);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background-color var(--transition-fast);
}

.column-card:hover {
  background-color: var(--bg-surface);
}

.node-region-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-tag-code {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.node-ping-badge {
  font-size: 0.78rem;
  font-weight: 600;
  color: #34c759;
  background: rgba(52, 199, 89, 0.1);
  padding: 2px 7px;
  border-radius: 5px;
}

.node-type-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.node-load-bar {
  width: 100%;
  height: 3px;
  background-color: var(--border-subtle);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 6px;
}

.load-fill {
  height: 100%;
  background-color: var(--accent-color);
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   8. 通用板块样式与触觉悬浮深度
   -------------------------------------------------------------------------- */
.section {
  padding: 96px 0;
  border-top: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-eyebrow {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-color);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 核心优势：3 图文卡片 */
.features-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.feature-box:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-light);
  background-color: var(--bg-primary);
}

.feature-index {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 18px;
}

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

.feature-body {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.65;
  flex-grow: 1;
}

.feature-list {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-list-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.feature-list-item svg {
  color: #34c759;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   9. 流媒体图卡 & AI 生产力专区卡片
   -------------------------------------------------------------------------- */
.showcase-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.showcase-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 42px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.showcase-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  background-color: var(--bg-primary);
}

.showcase-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 10px;
  background-color: var(--accent-subtle);
  color: var(--accent-color);
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
  width: fit-content;
}

.showcase-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.showcase-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.clean-chip {
  padding: 6px 13px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-primary);
}

[data-theme="dark"] .clean-chip {
  background-color: var(--bg-surface-elevated);
}

/* --------------------------------------------------------------------------
   10. 交互式流量滑块计算器 (Interactive Bandwidth Slider)
   -------------------------------------------------------------------------- */
.slider-calc-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-sm);
}

.slider-header-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.calc-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.calc-display {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.calc-val {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-color);
}

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

.slider-range {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border-light);
  outline: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.slider-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-color);
  box-shadow: 0 2px 8px rgba(0, 102, 204, 0.4);
  cursor: pointer;
  transition: transform 0.15s ease;
}

.slider-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.slider-stats-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.stat-highlight {
  font-weight: 700;
  color: #34c759;
}

/* --------------------------------------------------------------------------
   11. 清晰真实的套餐价格对比表 (Pricing Grid - 参考网上真实机场套餐)
   -------------------------------------------------------------------------- */
.pricing-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.plan-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 34px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.plan-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-light);
  background-color: var(--bg-primary);
}

.plan-card.highlighted {
  border-color: var(--accent-color);
  background-color: var(--bg-primary);
  box-shadow: var(--shadow-hover);
}

.plan-badge {
  position: absolute;
  top: -11px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--accent-color);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
}

.plan-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
}

.plan-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
  margin: 6px 0 18px;
  min-height: 38px;
}

.plan-price-wrap {
  text-align: center;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 22px;
}

.price-currency {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.price-figure {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.price-cycle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.price-note {
  font-size: 0.78rem;
  color: var(--accent-color);
  font-weight: 600;
  margin-top: 4px;
}

.plan-features-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
  margin-bottom: 26px;
}

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

.plan-feature-line svg {
  color: #34c759;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   12. 用户评价 (Testimonials)
   -------------------------------------------------------------------------- */
.reviews-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-normal);
}

.review-box:hover {
  transform: translateY(-4px);
  background-color: var(--bg-primary);
  box-shadow: var(--shadow-md);
}

.review-quote {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 22px;
}

.review-profile {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
}

.profile-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background-color: var(--accent-subtle);
  color: var(--accent-color);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.profile-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.profile-title {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   13. 常见问题解答 (FAQ)
   -------------------------------------------------------------------------- */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
}

.faq-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-card:hover {
  border-color: rgba(0, 0, 0, 0.15);
}

.faq-trigger {
  width: 100%;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
}

.faq-chevron {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform 0.25s var(--ease-spring);
}

.faq-card.open .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-color);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  padding: 0 22px;
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.7;
  transition: max-height 0.35s var(--ease-spring), padding 0.35s var(--ease-spring);
}

.faq-card.open .faq-content {
  max-height: 260px;
  padding: 0 22px 18px;
}

/* --------------------------------------------------------------------------
   14. 页脚规范 (严格仅保留四个标题，新页面打开)
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border-light);
  padding: 48px 0 36px;
  background-color: var(--bg-surface);
}

.footer-nav-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 24px;
}

.footer-link-item {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

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

.footer-cr {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
  padding-top: 22px;
}

/* --------------------------------------------------------------------------
   15. 资讯专栏与 SEO 长篇深度文章专有排版系统 (Article & SEO System)
   -------------------------------------------------------------------------- */
.breadcrumbs {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

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

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

.article-header {
  margin-bottom: 36px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-top: 14px;
  flex-wrap: wrap;
}

.article-meta-badge {
  background: var(--accent-subtle);
  color: var(--accent-color);
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  font-weight: 600;
}

/* 目录卡片 (Table of Contents) */
.toc-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 32px 0 44px;
}

.toc-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 4px;
}

.toc-link {
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: inline-block;
}

.toc-link:hover {
  color: var(--accent-color);
  transform: translateX(4px);
}

/* 长篇文章正文排版 */
.article-body {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 48px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
  letter-spacing: -0.02em;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 30px 0 14px;
}

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

.article-body strong {
  color: var(--text-primary);
  font-weight: 600;
}

.article-body a {
  color: var(--accent-color);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: var(--accent-hover);
}

.article-body ul, .article-body ol {
  margin: 16px 0 24px 20px;
}

.article-body ul {
  list-style: disc;
}

.article-body ol {
  list-style: decimal;
}

.article-body li {
  margin-bottom: 10px;
  line-height: 1.75;
}

/* 引用高亮呼吁盒 */
.article-callout {
  background-color: var(--bg-surface);
  border-left: 4px solid var(--accent-color);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 18px 24px;
  margin: 28px 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.article-callout.tip {
  border-left-color: #34c759;
  background-color: rgba(52, 199, 89, 0.06);
}

/* 对比表格排版 */
.article-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

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

.article-table td {
  padding: 13px 18px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}

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

/* 相关阅读卡片 (Related Reading) */
.related-reading-box {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--border-light);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 20px;
}

.related-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.related-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  background-color: var(--bg-primary);
}

.related-title {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 10px;
}

.related-date {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* 资讯主页卡片网格 */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin: 40px 0;
}

.news-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 34px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  background-color: var(--bg-primary);
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.news-cat {
  color: var(--accent-color);
  font-weight: 600;
  background: var(--accent-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}

.news-headline {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.news-summary {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

/* --------------------------------------------------------------------------
   16. 响应式媒体查询 (@media - 手机端单栏完美适配)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .dashboard-columns {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .features-grid-3 {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .site-header {
    height: 60px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    width: 100%;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    padding: 18px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    box-shadow: var(--shadow-md);
  }

  .nav-links.active {
    display: flex;
  }

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

  .hero-title {
    font-size: 2.3rem;
  }

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

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

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

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

  .showcase-grid-2 {
    grid-template-columns: 1fr;
  }

  .pricing-grid-4 {
    grid-template-columns: 1fr;
  }

  .reviews-grid-3 {
    grid-template-columns: 1fr;
  }

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

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

  .slider-header-flex {
    flex-direction: column;
    align-items: flex-start;
  }

  .article-body h2 {
    font-size: 1.4rem;
  }
}