/* ===================================================================
   一元机场 (Yiyuan Airport) - 2026 官方旗舰落地页与SEO站群样式系统
   设计风格：流光香槟金 (Champagne Gold) x 深邃极简高科技暗黑 (Deep Obsidian)
   代码规范：原生 CSS3，零外部依赖，极速秒开，全屏自适应，SEO友好
   =================================================================== */

:root {
  /* 基础暗黑配色 */
  --bg-primary: #090a0f;
  --bg-secondary: #11131b;
  --bg-card: rgba(18, 21, 30, 0.85);
  --bg-card-hover: rgba(26, 30, 44, 0.95);
  --bg-glass: rgba(255, 255, 255, 0.03);

  /* 流光香槟金体系 */
  --gold-primary: #e5c378;
  --gold-light: #f7e2a9;
  --gold-dark: #b88d3b;
  --gold-gradient: linear-gradient(135deg, #fce8b3 0%, #e5c378 50%, #b88d3b 100%);
  --gold-gradient-hover: linear-gradient(135deg, #ffffff 0%, #f7e2a9 50%, #cca34c 100%);
  --gold-glow: 0 0 25px rgba(229, 195, 120, 0.28);
  --gold-glow-intense: 0 0 35px rgba(229, 195, 120, 0.55);

  /* 文字配色 */
  --text-main: #f5f6fa;
  --text-muted: #9ba3b8;
  --text-dim: #6b7280;

  /* 边框与分割线 */
  --border-gold-subtle: rgba(229, 195, 120, 0.18);
  --border-gold-hover: rgba(229, 195, 120, 0.5);
  --border-dark: rgba(255, 255, 255, 0.07);

  /* 尺寸与间距 */
  --container-max: 1200px;
  --header-height: 76px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition-fast: 0.25s ease;
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  position: relative;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #171b26 0%, #090a0f 70%);
  min-height: 100vh;
}

/* 容器布局 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 文字排版与高亮工具类 */
.text-gold {
  color: var(--gold-primary);
}

.gold-gradient-text {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.section-title-wrap {
  text-align: center;
  margin-bottom: 54px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gold-primary);
  background: rgba(229, 195, 120, 0.1);
  border: 1px solid var(--border-gold-subtle);
  padding: 4px 14px;
  border-radius: 30px;
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

/* 按钮设计规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  white-space: nowrap;
}

.btn-gold {
  background: var(--gold-gradient);
  color: #1a1505;
  box-shadow: var(--gold-glow);
  position: relative;
  overflow: hidden;
}

.btn-gold::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -60%;
  width: 40%;
  height: 200%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.45), transparent);
  transform: rotate(25deg);
  transition: 0.6s all;
}

.btn-gold:hover::after {
  left: 120%;
}

.btn-gold:hover {
  background: var(--gold-gradient-hover);
  box-shadow: var(--gold-glow-intense);
  transform: translateY(-2px);
  color: #0d0a02;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-gold-subtle);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(229, 195, 120, 0.12);
  border-color: var(--gold-primary);
  color: var(--gold-light);
  transform: translateY(-2px);
}

.btn-large {
  padding: 15px 36px;
  font-size: 1.12rem;
  border-radius: 10px;
}

/* 顶部导航栏 (Header) */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(9, 10, 15, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-dark);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: background var(--transition-fast);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  cursor: pointer;
}

.logo-badge {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #120e03;
  font-weight: 900;
  font-size: 1.3rem;
  box-shadow: 0 0 16px rgba(229, 195, 120, 0.4);
}

.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.logo-sub {
  font-size: 0.72rem;
  color: var(--gold-primary);
  display: block;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gold-primary);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 主视觉区 (Hero Section) */
.hero-section {
  padding-top: calc(var(--header-height) + 70px);
  padding-bottom: 90px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 50px;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 20px;
  background: rgba(229, 195, 120, 0.08);
  border: 1px solid var(--border-gold-subtle);
  font-size: 0.88rem;
  color: var(--gold-light);
  margin-bottom: 24px;
}

.hero-pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 10px #10b981;
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.9); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.7; }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.18;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 34px;
}

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

.hero-trust-indicators {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.88rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-dark);
  padding-top: 24px;
}

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

.trust-icon {
  color: var(--gold-primary);
  font-size: 1.1rem;
}

/* 测速与动态数据卡片 (Hero Right) */
.hero-dashboard-card {
  background: var(--bg-card);
  border: 1px solid var(--border-gold-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6), var(--gold-glow);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(20px);
}

.hero-dashboard-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold-gradient);
}

.card-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 14px;
}

.ping-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: #10b981;
}

.speed-metric-main {
  text-align: center;
  padding: 16px 0 24px;
}

.speed-number {
  font-size: 3.8rem;
  font-weight: 800;
  line-height: 1;
  font-family: "SF Pro Display", -apple-system, monospace;
}

.speed-unit {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-left: 6px;
}

.speed-bars-visual {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 6px;
  height: 48px;
  margin-bottom: 24px;
}

.bar-col {
  width: 8px;
  background: rgba(229, 195, 120, 0.25);
  border-radius: 4px;
  transition: height 0.4s ease;
}

.bar-col.active {
  background: var(--gold-gradient);
  box-shadow: 0 0 8px rgba(229, 195, 120, 0.6);
}

.node-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.node-metric-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  padding: 12px 10px;
  text-align: center;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  display: block;
}

.metric-val {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gold-primary);
  margin-top: 4px;
  display: block;
}

/* 核心优势板块 (Features) */
.features-section {
  padding: 80px 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-gold-hover);
  box-shadow: var(--gold-glow);
  background: var(--bg-card-hover);
}

.feature-icon-box {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  background: rgba(229, 195, 120, 0.1);
  border: 1px solid var(--border-gold-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--gold-primary);
  margin-bottom: 22px;
}

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* 流媒体与 AI 支持图卡 (Ecosystem) */
.ecosystem-section {
  padding: 80px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(17, 19, 27, 0.6) 100%);
}

.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 18px;
}

.eco-card {
  background: var(--bg-card);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.eco-card:hover {
  border-color: var(--gold-primary);
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(229, 195, 120, 0.18);
}

.eco-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.7rem;
  margin-bottom: 12px;
  background: rgba(255, 255, 255, 0.04);
}

.eco-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 4px;
}

.eco-tag {
  font-size: 0.75rem;
  color: var(--gold-primary);
  background: rgba(229, 195, 120, 0.1);
  padding: 2px 8px;
  border-radius: 10px;
}

/* 套餐价格对比表 (Pricing) */
.pricing-section {
  padding: 90px 0;
  position: relative;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
}

.pricing-card:hover {
  border-color: var(--border-gold-hover);
  transform: translateY(-6px);
  box-shadow: var(--gold-glow);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(29, 34, 48, 0.95) 0%, rgba(18, 21, 30, 0.95) 100%);
  border: 1.5px solid var(--gold-primary);
  box-shadow: var(--gold-glow);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-4px);
  box-shadow: var(--gold-glow-intense);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gold-gradient);
  color: #120e03;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
  letter-spacing: 1px;
}

.pricing-header {
  text-align: center;
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.pricing-name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.pricing-amount-box {
  margin: 18px 0 6px;
  display: flex;
  align-items: baseline;
  justify-content: center;
}

.currency-sym {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--gold-primary);
  margin-right: 2px;
}

.pricing-amount {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

.pricing-period {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-left: 4px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.pricing-features li .check-icon {
  color: var(--gold-primary);
  font-weight: 700;
}

/* 精选文章图卡专区 (SEO 推荐库) */
.articles-section {
  padding: 85px 0;
  background: rgba(14, 16, 23, 0.5);
}

.featured-articles-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}

.article-hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border-gold-subtle);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
}

.article-hero-card:hover {
  border-color: var(--gold-primary);
  box-shadow: var(--gold-glow);
  transform: translateY(-4px);
}

.article-category {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--gold-primary);
  background: rgba(229, 195, 120, 0.1);
  padding: 3px 10px;
  border-radius: 6px;
  margin-bottom: 12px;
  align-self: flex-start;
}

.article-hero-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-hero-title a {
  color: var(--text-main);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.article-hero-title a:hover {
  color: var(--gold-primary);
}

.article-excerpt {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 22px;
  flex-grow: 1;
}

.article-card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-dark);
  padding-top: 18px;
  margin-top: auto;
}

.read-more-link {
  color: var(--gold-primary);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition-fast);
}

.read-more-link:hover {
  gap: 8px;
  color: var(--gold-light);
}

/* 28 篇长尾词网格卡片展示 */
.longtail-articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.longtail-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  padding: 16px 14px;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.longtail-card:hover {
  background: rgba(229, 195, 120, 0.05);
  border-color: var(--border-gold-subtle);
  transform: translateY(-2px);
}

.longtail-tag {
  font-size: 0.72rem;
  color: var(--gold-primary);
  margin-bottom: 6px;
}

.longtail-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.4;
  text-decoration: none;
}

.longtail-meta {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: auto;
  display: flex;
  justify-content: space-between;
}

/* 常见问题解答 (FAQ) */
.faq-section {
  padding: 85px 0;
}

.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-dark);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--border-gold-hover);
  background: var(--bg-card-hover);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--gold-primary);
  font-weight: 300;
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px 22px 24px;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.7;
}

/* 真实用户评价 (Testimonials) */
.testimonials-section {
  padding: 85px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(14, 16, 23, 0.7) 100%);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 26px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.testimonial-card:hover {
  border-color: var(--border-gold-subtle);
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.4);
}

.rating-stars {
  color: var(--gold-primary);
  margin-bottom: 12px;
  letter-spacing: 2px;
  font-size: 0.95rem;
}

.testimonial-quote {
  color: var(--text-main);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 18px;
  font-style: italic;
}

.user-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-dark);
  padding-top: 14px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #1a1505;
  font-weight: 700;
  font-size: 0.95rem;
}

.user-info .user-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.user-info .user-role {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* 语义化页脚 (Footer) */
.site-footer {
  background: #06070a;
  border-top: 1px solid var(--border-dark);
  padding: 55px 0 35px;
}

.footer-top-links {
  text-align: center;
  margin-bottom: 35px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-dark);
}

.footer-seo-title {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.seo-friendly-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 24px;
}

.seo-dofollow-link {
  color: var(--gold-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
  padding: 6px 14px;
  background: rgba(229, 195, 120, 0.08);
  border: 1px solid var(--border-gold-subtle);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.seo-dofollow-link:hover {
  background: rgba(229, 195, 120, 0.2);
  color: var(--gold-light);
  box-shadow: 0 0 15px rgba(229, 195, 120, 0.3);
}

.footer-nav-menu {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 36px;
  list-style: none;
  margin-bottom: 30px;
}

.footer-nav-item a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

.footer-nav-item a:hover {
  color: var(--gold-primary);
}

.footer-bottom {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* 页面右侧固定悬浮“逐章平滑滚动”控制器 */
.chapter-scroll-bar {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 999;
  background: rgba(14, 17, 24, 0.8);
  backdrop-filter: blur(12px);
  padding: 10px 8px;
  border-radius: 30px;
  border: 1px solid var(--border-gold-subtle);
  box-shadow: 0 8px 30px rgba(0,0,0,0.5);
}

.scroll-ctrl-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-dark);
  color: var(--gold-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 1.1rem;
}

.scroll-ctrl-btn:hover {
  background: var(--gold-gradient);
  color: #120e03;
  box-shadow: var(--gold-glow);
  transform: scale(1.1);
}

/* ===================================================================
   SEO 文章详情页专属排版样式 (Articles Layout)
   =================================================================== */
.article-header-hero {
  padding-top: calc(var(--header-height) + 50px);
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border-dark);
  background: radial-gradient(circle at 50% 20%, rgba(229, 195, 120, 0.08) 0%, transparent 70%);
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 18px;
}

.article-breadcrumb a {
  color: var(--gold-primary);
  text-decoration: none;
}

.article-main-title {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.article-post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.article-body-wrapper {
  padding: 60px 0 90px;
}

.article-content-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  align-items: start;
}

.article-rich-text {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #d1d5db;
}

.article-rich-text p {
  margin-bottom: 24px;
}

.article-rich-text h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 48px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-dark);
  position: relative;
}

.article-rich-text h2::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--gold-gradient);
}

.article-rich-text h3 {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--gold-light);
  margin-top: 32px;
  margin-bottom: 14px;
}

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

.article-rich-text li {
  margin-bottom: 10px;
}

.article-rich-text blockquote {
  background: rgba(229, 195, 120, 0.06);
  border-left: 4px solid var(--gold-primary);
  padding: 18px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 28px 0;
  font-style: italic;
  color: var(--text-main);
}

/* 优雅的数据对比表格 (SEO 文章专属) */
.article-table-wrapper {
  width: 100%;
  overflow-x: auto;
  margin: 32px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-gold-subtle);
  background: var(--bg-card);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.article-rich-text table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.article-rich-text th {
  background: rgba(229, 195, 120, 0.12);
  color: var(--gold-primary);
  font-weight: 700;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-gold-subtle);
  white-space: nowrap;
}

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

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

.article-rich-text tr:hover td {
  background: rgba(229, 195, 120, 0.04);
}

.article-inline-cta {
  background: linear-gradient(135deg, rgba(29, 34, 48, 0.95) 0%, rgba(18, 21, 30, 0.95) 100%);
  border: 1px solid var(--border-gold-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  margin: 40px 0;
  text-align: center;
  box-shadow: var(--gold-glow);
}

.article-inline-cta h4 {
  font-size: 1.35rem;
  margin-bottom: 10px;
}

.article-inline-cta p {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.article-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--gold-primary);
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 10px;
}

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

.sidebar-toc-list a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.sidebar-toc-list a:hover {
  color: var(--gold-primary);
}

/* ===================================================================
   移动端与响应式适配 (@media 媒体查询)
   =================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .ecosystem-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  .featured-articles-row {
    grid-template-columns: 1fr;
  }
  .longtail-articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-content-grid {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 68px;
  }
  .nav-links {
    display: none; /* 移动端精简，突出首屏与CTA */
  }
  .hero-title {
    font-size: 2.3rem;
  }
  .hero-btn-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-btn-group .btn {
    width: 100%;
  }
  .hero-trust-indicators {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .ecosystem-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .longtail-articles-grid {
    grid-template-columns: 1fr;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .chapter-scroll-bar {
    right: 10px;
    padding: 6px 4px;
  }
  .scroll-ctrl-btn {
    width: 32px;
    height: 32px;
    font-size: 0.95rem;
  }
  .article-main-title {
    font-size: 1.85rem;
  }
  .footer-nav-menu {
    gap: 18px;
  }
}