/* ===================================================================
   猫猫云 (maomaoyun.art) - 核心样式表 (style.css)
   设计规范：STYLE 54 — FUTURE MOBILITY (未来移动 / 交通界面 / 导航系统)
   视觉特性：速度 · 方向 · 精准 · 未来城市 · 移动之旅 (Point A -> Point B)
   =================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* STYLE 54 色彩系统 */
  --color-asphalt-black: #0c0e12;
  --color-asphalt-surface: #131720;
  --color-asphalt-card: #181d28;
  --color-asphalt-elevated: #1e2432;
  
  --color-concrete-gray: #262c3a;
  --color-concrete-border: #2e3546;
  --color-concrete-border-bright: #434c62;
  --color-concrete-muted: #647087;
  --color-concrete-text: #8e9bb2;
  
  --color-white: #f8fafc;
  --color-white-pure: #ffffff;
  
  --color-road-yellow: #f59e0b;
  --color-road-yellow-light: #fbbf24;
  --color-road-yellow-dim: rgba(245, 158, 11, 0.15);
  
  --color-traffic-red: #ef4444;
  --color-electric-blue: #0284c7;
  --color-electric-blue-light: #38bdf8;
  --color-electric-blue-dim: rgba(56, 189, 248, 0.12);
  
  --color-signal-green: #10b981;
  --color-signal-green-light: #34d399;
  --color-signal-green-dim: rgba(16, 185, 129, 0.15);

  --max-width: 1160px;
  --header-height: 68px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--color-asphalt-black);
  color: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-asphalt-black);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.06) 0%, transparent 60%),
    url("map-grid.svg");
  background-repeat: repeat;
  background-attachment: fixed;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

.section-padding {
  padding-top: 80px;
  padding-bottom: 80px;
  position: relative;
}

@media (min-width: 768px) {
  .section-padding {
    padding-top: 104px;
    padding-bottom: 104px;
  }
}

/* 道路水平线与标线 (Road-like horizontal lines) */
.road-divider {
  width: 100%;
  height: 2px;
  background-color: var(--color-concrete-border);
  position: relative;
  margin: 0;
}

.road-divider::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--color-road-yellow) 0, var(--color-road-yellow) 24px, transparent 24px, transparent 48px);
  opacity: 0.35;
}

/* 顶部导航 Header: 路线仪表导航 (Route Navigation HUD) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(12, 14, 18, 0.94);
  border-bottom: 1px solid var(--color-concrete-border);
  backdrop-filter: blur(12px);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: -0.01em;
}

.brand-logo-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-concrete-border);
}

.brand-tagline {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--color-road-yellow);
  letter-spacing: 1px;
  display: block;
}

/* 导航路线跟踪条 (ROUTE 01 / 02 / 03 / 04) */
.route-nav {
  display: none;
  align-items: center;
  gap: 20px;
}

@media (min-width: 900px) {
  .route-nav {
    display: flex;
  }
}

.route-step-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-concrete-text);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.route-step-item:hover {
  color: var(--color-white);
  background-color: var(--color-asphalt-surface);
}

.route-step-item.is-active {
  color: var(--color-white);
  background-color: var(--color-asphalt-card);
  border: 1px solid var(--color-concrete-border);
}

.route-step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-road-yellow);
  padding: 1px 5px;
  background-color: var(--color-road-yellow-dim);
  border-radius: 2px;
}

/* 动态定位点 (Animated Location Dot) */
.location-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-signal-green);
  display: inline-block;
  box-shadow: 0 0 8px var(--color-signal-green);
  animation: pulseLocationDot 1.8s infinite ease-in-out;
}

@keyframes pulseLocationDot {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.4);
    opacity: 0.6;
  }
}

/* 移动端汉堡菜单按钮 */
.mobile-menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  color: var(--color-white);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-asphalt-surface);
}

.mobile-menu-btn svg {
  width: 22px;
  height: 22px;
}

@media (min-width: 900px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* 移动端展开导航 */
@media (max-width: 899px) {
  .route-nav.nav-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-asphalt-black);
    border-bottom: 2px solid var(--color-road-yellow);
    padding: 20px;
    gap: 12px;
    box-shadow: 0 16px 24px rgba(0, 0, 0, 0.6);
  }

  .route-nav.nav-open .route-step-item {
    padding: 12px;
    font-size: 15px;
  }
}

/* 头部导航 CTA 按钮 */
.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-asphalt-black);
  background-color: var(--color-road-yellow);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-cta-btn:hover {
  background-color: var(--color-road-yellow-light);
  transform: translateX(2px);
}

/* ===================================================================
   FUTURE MOBILITY 核心按钮系统
   CTA 交互规范：
   - 矩形横向通道感
   - 进站路线导入 (Route line enters button)
   - 距离标签与 READY 状态
   - Hover 时路线向前位移 4px 并加速
   =================================================================== */

.btn-mobility-primary {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-asphalt-black);
  background-color: var(--color-road-yellow);
  border: 1px solid var(--color-road-yellow);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.25);
}

.btn-mobility-primary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 2px;
  background-color: var(--color-asphalt-black);
  transition: width 0.2s ease;
}

.btn-mobility-primary:hover {
  background-color: var(--color-road-yellow-light);
  transform: translateX(4px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
}

.btn-mobility-primary:hover::before {
  width: 22px;
}

.btn-mobility-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  background-color: var(--color-asphalt-card);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.btn-mobility-secondary:hover {
  border-color: var(--color-electric-blue-light);
  background-color: var(--color-asphalt-elevated);
  transform: translateX(2px);
}

.btn-block {
  width: 100%;
}

.btn-meta-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.5px;
  background-color: rgba(12, 14, 18, 0.15);
  padding: 2px 6px;
  border-radius: 2px;
}

/* ===================================================================
   HERO 区块：产品在道路中央 · 未来城市高架视角
   =================================================================== */

.hero-mobility-section {
  padding-top: 48px;
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
  border-bottom: 2px solid var(--color-concrete-border);
}

.hero-telemetry-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.telemetry-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-concrete-text);
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-sm);
}

.telemetry-chip.highlight {
  color: var(--color-road-yellow);
  border-color: rgba(245, 158, 11, 0.4);
  background-color: var(--color-road-yellow-dim);
}

.hero-title {
  font-size: 34px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--color-white-pure);
  line-height: 1.2;
  margin-bottom: 18px;
  max-width: 820px;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 52px;
  }
}

.hero-subtitle {
  font-size: 16px;
  color: var(--color-concrete-text);
  line-height: 1.65;
  max-width: 700px;
  margin-bottom: 36px;
}

@media (min-width: 768px) {
  .hero-subtitle {
    font-size: 18px;
  }
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-highway-stage {
  position: relative;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-concrete-border);
  overflow: hidden;
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.7);
  background-color: var(--color-asphalt-surface);
  margin-bottom: 32px;
}

/* 路线监控仪表盘 (Real-time Speedometer & Latency Gauge) */
.speedometer-dashboard {
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 24px;
}

.speedometer-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--color-concrete-border);
}

.speedometer-header-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.5px;
}

.speedometer-refresh-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-road-yellow);
  background-color: var(--color-asphalt-card);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.speedometer-refresh-btn:hover {
  border-color: var(--color-road-yellow);
  background-color: var(--color-road-yellow-dim);
}

.speedometer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 640px) {
  .speedometer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .speedometer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* 路线卡片 (Route Node Card) */
.route-node-card {
  padding: 18px;
  background-color: var(--color-asphalt-card);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-sm);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.route-node-card:hover {
  border-color: var(--color-electric-blue-light);
  transform: translateY(-2px);
}

.route-node-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background-color: var(--color-road-yellow);
}

.node-destination-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-metric-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.node-ping-display {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 800;
  color: var(--color-white-pure);
  line-height: 1;
}

.node-ping-display small {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-concrete-text);
  margin-left: 2px;
}

.node-status-tag {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--color-signal-green);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ===================================================================
   SECTION 1: DISCOVERY 探测阶段 — 站点与场景支持 (Route Stop Cards)
   =================================================================== */

.section-waypoint-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-road-yellow);
  letter-spacing: 2px;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.section-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-white-pure);
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 36px;
  }
}

.section-desc {
  font-size: 15px;
  color: var(--color-concrete-text);
  max-width: 680px;
  margin-bottom: 40px;
}

.route-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .route-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .route-cards-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.route-stop-card {
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.25s ease;
}

.route-stop-card:hover {
  border-color: var(--color-road-yellow);
  transform: translateY(-3px);
}

.stop-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px dashed var(--color-concrete-border);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-concrete-muted);
}

.stop-indicator {
  color: var(--color-road-yellow);
  font-weight: 700;
}

.stop-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 10px;
}

.stop-desc {
  font-size: 14px;
  color: var(--color-concrete-text);
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 18px;
}

.stop-footer-tag {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-electric-blue-light);
  background-color: var(--color-asphalt-card);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
}

/* ===================================================================
   SECTION 2: PROOF 验证阶段 — 核心特性与传输保障
   =================================================================== */

.features-matrix-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .features-matrix-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature-telemetry-card {
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
}

.feature-telemetry-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.feature-icon-wrapper {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background-color: var(--color-asphalt-card);
  border: 1px solid var(--color-concrete-border);
  color: var(--color-road-yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.feature-icon-wrapper svg {
  width: 22px;
  height: 22px;
}

.feature-heading {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-white);
}

.feature-body-text {
  font-size: 14px;
  color: var(--color-concrete-text);
  line-height: 1.65;
}

/* ===================================================================
   SECTION 3: DESTINATION 终点站 — 交通分级定价 (Transit Tiers)
   等级：CITY 市内畅行 / EXPRESS 极速干线 (最快路线) / PREMIUM 商务专线
   =================================================================== */

.transit-pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 860px) {
  .transit-pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: stretch;
  }
}

.transit-tier-card {
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.25s ease;
}

.transit-tier-card:hover {
  transform: translateY(-4px);
}

.transit-tier-card.featured-fastest {
  border: 2px solid var(--color-road-yellow);
  background-color: var(--color-asphalt-card);
  box-shadow: 0 12px 30px rgba(245, 158, 11, 0.15);
}

.fastest-route-badge {
  position: absolute;
  top: -13px;
  left: 24px;
  padding: 4px 12px;
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 800;
  color: var(--color-asphalt-black);
  background-color: var(--color-road-yellow);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 1px;
}

.tier-code-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-road-yellow);
  margin-bottom: 6px;
  display: block;
}

.tier-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 6px;
}

.tier-target {
  font-size: 13px;
  color: var(--color-concrete-muted);
  margin-bottom: 24px;
}

.tier-fare-box {
  display: flex;
  align-items: baseline;
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--color-concrete-border);
}

.fare-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-right: 4px;
}

.fare-amount {
  font-family: var(--font-mono);
  font-size: 44px;
  font-weight: 900;
  color: var(--color-white-pure);
  line-height: 1;
}

.fare-period {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--color-concrete-text);
  margin-left: 8px;
}

.tier-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.tier-spec-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--color-concrete-text);
}

.tier-spec-item svg {
  width: 16px;
  height: 16px;
  fill: var(--color-road-yellow);
  flex-shrink: 0;
  margin-top: 3px;
}

/* ===================================================================
   SECTION 4: SCENARIOS 使用场景卡 (4张)
   =================================================================== */

.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .scenarios-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .scenarios-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.scenario-card {
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.scenario-route-tag {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-road-yellow);
  margin-bottom: 8px;
}

.scenario-heading {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

.scenario-device-pill {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-electric-blue-light);
  background-color: var(--color-asphalt-card);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  align-self: flex-start;
}

.scenario-text {
  font-size: 13px;
  color: var(--color-concrete-text);
  line-height: 1.6;
}

/* ===================================================================
   SECTION 5: FAQ 导航问答
   =================================================================== */

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 820px;
}

.faq-item {
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  transition: border-color 0.2s ease;
}

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

.faq-question {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-white);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.faq-question::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-road-yellow);
}

details[open] .faq-question::after {
  content: "−";
}

.faq-answer {
  margin-top: 14px;
  font-size: 14px;
  color: var(--color-concrete-text);
  line-height: 1.7;
  border-top: 1px solid var(--color-concrete-border);
  padding-top: 12px;
}

/* ===================================================================
   FINAL SECTION: DESTINATION REACHED 目的地已抵达
   转化行为：“抵达目的地”
   =================================================================== */

.destination-reached-section {
  padding-top: 88px;
  padding-bottom: 88px;
  background-color: var(--color-asphalt-surface);
  border-top: 2px solid var(--color-road-yellow);
  border-bottom: 1px solid var(--color-concrete-border);
  text-align: center;
  position: relative;
}

.destination-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-signal-green);
  background-color: var(--color-signal-green-dim);
  border: 1px solid rgba(16, 185, 129, 0.4);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.destination-title {
  font-size: 30px;
  font-weight: 900;
  color: var(--color-white-pure);
  margin-bottom: 14px;
}

@media (min-width: 768px) {
  .destination-title {
    font-size: 40px;
  }
}

.destination-desc {
  font-size: 16px;
  color: var(--color-concrete-text);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 32px;
  line-height: 1.65;
}

/* 移动端吸底导航 HUD */
.mobile-sticky-hud {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 95;
  background-color: rgba(12, 14, 18, 0.96);
  border-top: 1px solid var(--color-concrete-border);
  backdrop-filter: blur(12px);
  padding: 10px 16px;
  box-shadow: 0 -8px 20px rgba(0, 0, 0, 0.6);
}

.mobile-sticky-hud.is-active {
  display: block;
}

.mobile-hud-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-hud-info {
  display: flex;
  flex-direction: column;
}

.mobile-hud-dest {
  font-size: 14px;
  font-weight: 800;
  color: var(--color-white);
}

.mobile-hud-meta {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--color-road-yellow);
}

.mobile-hud-btn {
  padding: 9px 18px;
  font-size: 13px;
}

@media (min-width: 769px) {
  .mobile-sticky-hud {
    display: none !important;
  }
}

/* 页脚 Footer */
.site-footer {
  margin-top: auto;
  background-color: #080a0d;
  color: var(--color-concrete-muted);
  padding-top: 64px;
  padding-bottom: 36px;
  font-size: 13px;
  border-top: 1px solid var(--color-concrete-border);
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-concrete-border);
}

@media (min-width: 640px) {
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .footer-top {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-brand-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 13px;
  line-height: 1.6;
  max-width: 320px;
  color: var(--color-concrete-text);
}

.footer-col-title {
  font-size: 14px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}

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

.footer-link {
  color: var(--color-concrete-text);
  transition: color 0.15s ease;
}

.footer-link:hover {
  color: var(--color-road-yellow);
}

.footer-bottom {
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 12px;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer-affiliate-note {
  max-width: 640px;
  color: var(--color-concrete-muted);
  line-height: 1.5;
}

/* 返回顶部 (Elevation Return Button) */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 85;
  width: 42px;
  height: 42px;
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-sm);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease, border-color 0.2s ease;
}

.back-to-top:hover {
  border-color: var(--color-road-yellow);
  color: var(--color-road-yellow);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* ===================================================================
   SEO 文章与子页面专用样式 (一致化继承 STYLE 54)
   =================================================================== */

.article-container {
  max-width: 840px;
  margin-left: auto;
  margin-right: auto;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--color-concrete-muted);
  margin-bottom: 20px;
}

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

.breadcrumb a:hover {
  color: var(--color-road-yellow);
}

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

.article-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-white-pure);
  line-height: 1.3;
  margin-bottom: 14px;
}

@media (min-width: 768px) {
  .article-title {
    font-size: 36px;
  }
}

.article-meta {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--color-concrete-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.article-content {
  font-size: 16px;
  line-height: 1.8;
  color: #cbd5e1;
}

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

.article-content h2 {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-white);
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-concrete-border);
}

.article-content h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-white);
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-content ul, .article-content ol {
  margin-bottom: 22px;
  padding-left: 24px;
}

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

.article-content a {
  color: var(--color-electric-blue-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content a:hover {
  color: var(--color-road-yellow);
}

.article-callout {
  background-color: var(--color-asphalt-surface);
  border-left: 4px solid var(--color-road-yellow);
  border-top: 1px solid var(--color-concrete-border);
  border-right: 1px solid var(--color-concrete-border);
  border-bottom: 1px solid var(--color-concrete-border);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 28px 0;
  font-size: 14px;
}

.article-callout-title {
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--color-road-yellow);
  margin-bottom: 8px;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-asphalt-surface);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}

.article-table th {
  background-color: var(--color-asphalt-card);
  padding: 14px 18px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-white);
  border-bottom: 1px solid var(--color-concrete-border);
}

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

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

/* 文末 CTA 模块 */
.article-cta-box {
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-md);
  padding: 32px;
  margin: 48px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.article-cta-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-road-yellow);
}

.article-cta-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 10px;
}

.article-cta-desc {
  font-size: 14px;
  color: var(--color-concrete-text);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 24px;
}

/* 延伸阅读 */
.related-articles {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-concrete-border);
}

.related-articles-title {
  font-size: 18px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--color-white);
  margin-bottom: 18px;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.related-card {
  padding: 18px;
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-sm);
  display: block;
  transition: all 0.2s ease;
  text-decoration: none !important;
}

.related-card:hover {
  border-color: var(--color-road-yellow);
  transform: translateX(3px);
}

.related-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 6px;
}

.related-card-desc {
  font-size: 12px;
  color: var(--color-concrete-text);
  line-height: 1.5;
}

/* 教程列表页 (jiaocheng.html) */
.guides-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .guides-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.guide-item-card {
  padding: 26px;
  background-color: var(--color-asphalt-surface);
  border: 1px solid var(--color-concrete-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
}

.guide-item-card:hover {
  border-color: var(--color-road-yellow);
  transform: translateY(-3px);
}

.guide-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-road-yellow);
  margin-bottom: 8px;
}

.guide-title {
  font-size: 19px;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 10px;
}

.guide-summary {
  font-size: 14px;
  color: var(--color-concrete-text);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.guide-meta {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-concrete-muted);
  display: flex;
  align-items: center;
  gap: 12px;
}