/* ==========================================================================
   极速光轨 (Speed Horizon) - 随便云品牌专属设计系统
   色彩基调：深邃星夜黑蓝 (#070b14, #0a1128) + 极速电光蓝/青 (#00f0ff, #3b82f6)
   适配多端：移动优先，触控区域 >= 44px，无水平溢出，尊重 prefers-reduced-motion
   ========================================================================== */

:root {
  --bg-space: #070b14;
  --bg-deep: #0a1128;
  --bg-card: rgba(13, 21, 39, 0.75);
  --bg-card-hover: rgba(18, 30, 56, 0.85);
  --bg-surface: #0f1a36;
  --border-subtle: rgba(59, 130, 246, 0.2);
  --border-glow: rgba(0, 240, 255, 0.45);
  --cyan-neon: #00f0ff;
  --blue-laser: #3b82f6;
  --blue-bright: #60a5fa;
  --direct-green: #10b981;
  --fallback-amber: #f59e0b;
  --reject-red: #ef4444;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --container-max: 1200px;
  --header-height: 72px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-space);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  background: radial-gradient(circle at 50% 0%, #0d1e44 0%, var(--bg-space) 60%);
}

/* 链接无障碍规范 */
a {
  color: var(--blue-bright);
  text-decoration: none;
  transition: color 0.2s ease, text-shadow 0.2s ease;
}

a:hover, a:focus-visible {
  color: var(--cyan-neon);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* 容器与版心 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 导航栏 */
.site-header {
  height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 11, 20, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

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

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

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #00f0ff 0%, #3b82f6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.4);
}

.brand-icon svg {
  width: 22px;
  height: 22px;
  fill: #070b14;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  background: linear-gradient(90deg, #ffffff 0%, #00f0ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-sub {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-left: 6px;
  padding: 2px 6px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
}

/* 导航链接 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 10px 4px;
  display: inline-block;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--cyan-neon);
  text-decoration: none;
  border-bottom: 2px solid var(--cyan-neon);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  font-size: 0.92rem;
  font-weight: 600;
  color: #070b14 !important;
  background: linear-gradient(90deg, #00f0ff 0%, #3b82f6 100%);
  border-radius: var(--radius-sm);
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  white-space: nowrap;
}

.header-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 26px rgba(0, 240, 255, 0.55);
  text-decoration: none !important;
}

/* 移动端菜单切换按键 */
.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  min-height: 44px;
  min-width: 44px;
  cursor: pointer;
}

/* Hero 区域：极速光轨 */
.hero-section {
  position: relative;
  padding: 60px 0 80px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-canvas-wrap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  opacity: 0.6;
}

#speed-horizon-canvas {
  width: 100%;
  height: 100%;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--border-glow);
  color: var(--cyan-neon);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-neon);
  box-shadow: 0 0 8px var(--cyan-neon);
}

.hero-h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 30%, #60a5fa 70%, #00f0ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

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

.btn-primary {
  min-height: 48px;
  padding: 0 28px;
  font-size: 1rem;
  font-weight: 600;
  color: #070b14 !important;
  background: linear-gradient(90deg, #00f0ff 0%, #3b82f6 100%);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 24px rgba(0, 240, 255, 0.4);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 32px rgba(0, 240, 255, 0.65);
  text-decoration: none !important;
}

.btn-secondary {
  min-height: 48px;
  padding: 0 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main) !important;
  background: rgba(15, 26, 54, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.btn-secondary:hover {
  background: var(--bg-surface);
  border-color: var(--cyan-neon);
  text-decoration: none !important;
}

/* 极速光轨特性指标条 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 50px;
  text-align: left;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(8px);
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--cyan-neon), var(--blue-laser));
}

.stat-title {
  font-size: 0.85rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.stat-value {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--cyan-neon);
}

.stat-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 通用章节容器 */
.section {
  padding: 70px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cyan-neon);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 配置结构全景 */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  position: relative;
}

.arch-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
  position: relative;
}

.arch-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.arch-step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(0, 240, 255, 0.1);
  color: var(--cyan-neon);
  font-size: 0.85rem;
  font-weight: 700;
  border: 1px solid var(--border-glow);
  margin-bottom: 14px;
}

.arch-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 10px;
}

.arch-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.arch-code-snip {
  background: #050810;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan-neon);
  overflow-x: auto;
}

/* 策略组解释器：交互演示工具 */
.interactive-demo-box {
  background: #0a1128;
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: 0 0 40px rgba(0, 240, 255, 0.12);
}

.demo-disclaimer-banner {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 0.85rem;
  color: #fbbf24;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.demo-controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 28px;
}

.demo-control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.demo-control-group label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--cyan-neon);
}

.demo-select, .demo-input {
  width: 100%;
  min-height: 44px;
  padding: 8px 14px;
  background: #070b14;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: #ffffff;
  font-family: inherit;
  font-size: 0.95rem;
}

.demo-select:focus, .demo-input:focus {
  outline: none;
  border-color: var(--cyan-neon);
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.demo-flow-visual {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 24px;
  background: #070b14;
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-subtle);
  position: relative;
  overflow-x: auto;
}

.flow-step-node {
  flex: 1;
  min-width: 180px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
  position: relative;
  transition: all 0.3s ease;
}

.flow-step-node.active-pulse {
  border-color: var(--cyan-neon);
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.3);
  transform: scale(1.02);
}

.flow-node-title {
  font-size: 0.78rem;
  color: var(--text-dim);
  text-transform: uppercase;
}

.flow-node-value {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-top: 6px;
  word-break: break-all;
}

.flow-node-sub {
  font-size: 0.78rem;
  color: var(--cyan-neon);
  margin-top: 4px;
}

.flow-arrow-track {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-neon);
  font-size: 1.2rem;
  padding: 0 6px;
}

.demo-result-callout {
  margin-top: 24px;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.demo-result-icon {
  font-size: 1.4rem;
  color: var(--direct-green);
  line-height: 1;
}

.demo-result-text {
  font-size: 0.92rem;
  color: #e2e8f0;
}

/* 六篇文章模块 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-neon);
  box-shadow: 0 8px 30px rgba(0, 240, 255, 0.15);
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.article-card-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(59, 130, 246, 0.15);
  color: var(--blue-bright);
}

.article-card-time {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.article-card-title {
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
  color: #ffffff;
}

.article-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex: 1;
}

.article-card-deliverable {
  background: rgba(15, 26, 54, 0.6);
  border-left: 3px solid var(--cyan-neon);
  padding: 8px 12px;
  font-size: 0.82rem;
  color: var(--cyan-neon);
  margin-bottom: 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article-card-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--cyan-neon);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
}

/* 套餐区域 */
.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

.plan-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.plan-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.5);
}

.plan-card.featured {
  border-color: var(--cyan-neon);
  background: linear-gradient(180deg, rgba(13, 21, 39, 0.9) 0%, rgba(10, 17, 40, 0.9) 100%);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.15);
}

.plan-badge {
  position: absolute;
  top: 18px;
  right: 20px;
  background: rgba(0, 240, 255, 0.15);
  border: 1px solid var(--cyan-neon);
  color: var(--cyan-neon);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 10px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 16px 0 20px;
}

.plan-symbol {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--cyan-neon);
}

.plan-price {
  font-size: 2.8rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1;
}

.plan-cycle {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.plan-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex: 1;
}

.plan-specs-list li {
  font-size: 0.92rem;
  color: #cbd5e1;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.plan-specs-list li::before {
  content: "✓";
  color: var(--cyan-neon);
  font-weight: 700;
}

.plan-action-btn {
  width: 100%;
  min-height: 46px;
  padding: 0 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #070b14 !important;
  background: linear-gradient(90deg, #00f0ff 0%, #3b82f6 100%);
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.3);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.plan-action-btn:hover {
  opacity: 0.95;
  transform: translateY(-2px);
  text-decoration: none !important;
}

/* 事实核验与免责声明条 */
.facts-disclaimer-box {
  background: rgba(15, 26, 54, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-top: 40px;
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.7;
}

.facts-disclaimer-box strong {
  color: var(--text-muted);
}

/* 评价真实空态 (Real Empty State) */
.reviews-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.empty-review-box {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  padding: 40px 24px;
  background: var(--bg-card);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-md);
}

.empty-review-icon {
  font-size: 2.2rem;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.empty-review-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 8px;
}

.empty-review-text {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* FAQ 模块 */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

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

.faq-question {
  width: 100%;
  min-height: 52px;
  padding: 16px 22px;
  background: transparent;
  border: none;
  color: #ffffff;
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  gap: 16px;
}

.faq-toggle-icon {
  font-size: 1.2rem;
  color: var(--cyan-neon);
  transition: transform 0.2s ease;
}

.faq-item.open .faq-toggle-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 22px 20px;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

/* 页脚 */
.site-footer {
  background: #050810;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
}

.footer-col p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--cyan-neon);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* 文章详情页样式 */
.article-header {
  padding: 50px 0 30px;
  border-bottom: 1px solid var(--border-subtle);
}

.breadcrumb-nav {
  margin-bottom: 20px;
  font-size: 0.88rem;
  color: var(--text-dim);
}

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

.breadcrumb-nav a:hover {
  color: var(--cyan-neon);
}

.article-page-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.35;
  color: #ffffff;
  margin-bottom: 16px;
}

.article-page-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.article-body-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  padding: 50px 0 80px;
}

.article-content {
  font-size: 1.02rem;
  line-height: 1.85;
  color: #e2e8f0;
}

.article-content p {
  margin-bottom: 22px;
}

.article-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: #ffffff;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--cyan-neon);
  margin: 28px 0 12px;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.9rem;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

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

.article-content th {
  background: var(--bg-surface);
  color: var(--cyan-neon);
  font-weight: 600;
}

.article-content tr:hover {
  background: rgba(59, 130, 246, 0.05);
}

/* 侧边推荐卡片 */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px;
}

.sidebar-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-card li a {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.4;
  display: block;
}

.sidebar-card li a:hover {
  color: var(--cyan-neon);
}

/* 404 页面 */
.error-page-wrap {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 20px;
}

.error-code {
  font-size: 6rem;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--cyan-neon), var(--blue-laser));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}

/* 响应式适配 */
@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .article-body-layout {
    grid-template-columns: 1fr;
  }
  .demo-controls-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: #070b14;
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 20px;
    gap: 12px;
  }

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

  .nav-links a {
    width: 100%;
    padding: 10px 0;
  }

  .header-cta {
    display: none;
  }

  .hero-section {
    padding: 40px 0 60px;
  }

  .hero-canvas-wrap {
    display: none; /* 移动端以静态轻量样式代替 Canvas */
  }

  .demo-flow-visual {
    flex-direction: column;
    align-items: stretch;
  }

  .flow-arrow-track {
    transform: rotate(90deg);
    padding: 8px 0;
  }

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

  .article-content table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

/* 尊重用户的动画减弱偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  #speed-horizon-canvas {
    display: none;
  }
}