/* 69云 (69yun.casa) 官方落地页样式表 - 极速·高端·全平台响应式 */

:root {
  --bg-main: #070c18;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(26, 38, 66, 0.85);
  --bg-glass: rgba(15, 23, 42, 0.8);
  --border-color: rgba(56, 189, 248, 0.16);
  --border-bright: rgba(56, 189, 248, 0.45);
  
  --primary: #0284c7;
  --primary-glow: #38bdf8;
  --accent-cyan: #00f2fe;
  --accent-purple: #818cf8;
  --accent-gold: #fbbf24;
  --success: #10b981;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 16px 36px -4px rgba(0, 0, 0, 0.5), 0 8px 16px -4px rgba(2, 132, 199, 0.15);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
}

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

html {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  scroll-behavior: smooth;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #0d1e3a 0%, #070c18 65%, #050811 100%);
  background-attachment: fixed;
}

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

img, svg {
  vertical-align: middle;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-padding {
  padding: 84px 0;
}

@media (max-width: 768px) {
  .section-padding {
    padding: 56px 0;
  }
  .container {
    padding: 0 16px;
  }
}

/* 顶部导航 Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 12, 24, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
}

.brand-text {
  background: linear-gradient(135deg, #ffffff 40%, #7dd3fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tag {
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 6px;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #38bdf8;
  font-weight: 600;
  margin-left: 4px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.main-nav a {
  color: var(--text-muted);
  font-size: 0.96rem;
  font-weight: 500;
}

.main-nav a:hover {
  color: #38bdf8;
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.6rem;
  cursor: pointer;
  padding: 6px;
}

@media (max-width: 860px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(11, 19, 41, 0.98);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    border-bottom: 1px solid var(--border-bright);
    box-shadow: var(--shadow-lg);
  }
  .main-nav.active {
    display: flex;
  }
  .mobile-menu-btn {
    display: block;
  }
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1 0%, #0284c7 100%);
  border-color: #38bdf8;
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.5);
  transform: translateY(-2px);
}

.btn-outline {
  background: rgba(15, 23, 42, 0.5);
  color: #e2e8f0;
  border-color: var(--border-color);
}

.btn-outline:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--border-bright);
  color: #38bdf8;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 7px 16px;
  font-size: 0.86rem;
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.08rem;
  border-radius: var(--radius-md);
}

/* 文本渐变与徽标 */
.text-gradient {
  background: linear-gradient(135deg, #38bdf8 0%, #00f2fe 50%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 9999px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.28);
  color: #38bdf8;
}

/* 头部 Hero 区域 */
.hero {
  position: relative;
  padding: 76px 0 96px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-badge-wrap {
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.3rem, 4.8vw, 3.6rem);
  font-weight: 900;
  line-height: 1.18;
  margin-bottom: 22px;
  letter-spacing: -0.03em;
}

.hero-lead {
  font-size: clamp(1.02rem, 1.3vw, 1.18rem);
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 32px;
}

.hero-features-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  margin-bottom: 36px;
}

.hero-features-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.94rem;
  color: #cbd5e1;
}

.hero-features-list svg {
  color: #38bdf8;
  flex-shrink: 0;
}

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

.hero-cta-note {
  margin-top: 14px;
  font-size: 0.84rem;
  color: var(--text-dim);
}

.hero-card-visual {
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.85) 0%, rgba(11, 19, 41, 0.95) 100%);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg), inset 0 1px 1px rgba(255, 255, 255, 0.1);
  position: relative;
}

.visual-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.visual-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: #38bdf8;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 10px #10b981;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.visual-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.metric-item {
  background: rgba(7, 12, 24, 0.6);
  border: 1px solid var(--border-color);
  padding: 16px;
  border-radius: var(--radius-sm);
}

.metric-num {
  font-size: 1.55rem;
  font-weight: 800;
  color: #ffffff;
  display: block;
}

.metric-desc {
  font-size: 0.82rem;
  color: var(--text-dim);
}

.visual-nodes-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.15);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
}

.node-flag {
  font-size: 1.1rem;
  margin-right: 8px;
}

.node-speed {
  color: #10b981;
  font-weight: 700;
  font-size: 0.82rem;
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* 板块通用头部 */
.section-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #38bdf8;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.85rem, 3.2vw, 2.5rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 核心特性网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.25) 0%, rgba(99, 102, 241, 0.2) 100%);
  border: 1px solid var(--border-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 22px;
  color: #38bdf8;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.7;
}

@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* 套餐定价区域 */
.pricing-tabs-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 40px;
}

.plan-filter-bar {
  display: inline-flex;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-color);
  padding: 5px;
  border-radius: 9999px;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

.tab-btn {
  background: none;
  border: none;
  padding: 9px 22px;
  border-radius: 9999px;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn.active, .tab-btn:hover {
  background: #0284c7;
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.4);
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  max-width: 1120px;
  margin: 0 auto;
}

.plan-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.plan-card:hover {
  border-color: var(--border-bright);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.plan-card.featured {
  background: linear-gradient(180deg, rgba(2, 132, 199, 0.16) 0%, rgba(15, 23, 42, 0.92) 100%);
  border: 2px solid #0284c7;
  box-shadow: 0 14px 36px rgba(2, 132, 199, 0.3);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 5px 18px;
  border-radius: 9999px;
  letter-spacing: 0.04em;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.45);
  white-space: nowrap;
}

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.plan-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  line-height: 1.5;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-color);
}

.currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: #38bdf8;
}

.price-amount {
  font-size: 2.5rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}

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

.plan-specs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 26px;
  flex: 1;
}

.plan-specs li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: #cbd5e1;
}

.plan-specs svg {
  color: #10b981;
  flex-shrink: 0;
}

.plan-btn {
  width: 100%;
}

.pricing-notes {
  margin-top: 36px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.8;
}

@media (max-width: 960px) {
  .plans-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
  }
}

/* 适用场景选择器 */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.scenario-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
}

.scenario-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.scenario-icon {
  font-size: 1.6rem;
}

.scenario-head h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.scenario-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
  flex: 1;
}

.scenario-recommend {
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
}

.recommend-label {
  color: #94a3b8;
}

.recommend-plan {
  color: #38bdf8;
  font-weight: 700;
}

@media (max-width: 900px) {
  .scenarios-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .scenarios-grid {
    grid-template-columns: 1fr;
  }
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
}

.review-stars {
  color: #f59e0b;
  font-size: 1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.94rem;
  color: #cbd5e1;
  line-height: 1.75;
  margin-bottom: 20px;
  flex: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #6366f1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.author-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
}

.author-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: #f8fafc;
}

.author-tag {
  font-size: 0.78rem;
  color: #38bdf8;
}

@media (max-width: 960px) {
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .reviews-grid {
    grid-template-columns: 1fr;
  }
}

/* 常见问题 FAQ Accordion */
.faq-wrapper {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item[open] {
  border-color: var(--border-bright);
  background: rgba(20, 31, 56, 0.85);
}

.faq-summary {
  list-style: none;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  font-size: 1.04rem;
  font-weight: 600;
  color: #f1f5f9;
}

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

.faq-toggle-icon {
  font-size: 1.25rem;
  color: #38bdf8;
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

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

.faq-body {
  padding: 0 22px 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
  border-top: 1px solid rgba(56, 189, 248, 0.08);
  margin-top: 4px;
  padding-top: 14px;
}

/* 深度 SEO 机场专栏 Articles */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.article-card:hover {
  border-color: var(--border-bright);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.article-badge {
  font-size: 0.74rem;
  font-weight: 700;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.1);
  padding: 3px 10px;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 12px;
}

.article-card h3 {
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-card h3 a:hover {
  color: #38bdf8;
}

.article-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
}

@media (max-width: 992px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
}

/* CTA 转换横幅 */
.cta-banner {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.22) 0%, rgba(99, 102, 241, 0.15) 100%);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  padding: 56px 36px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.cta-banner h2 {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner p {
  color: #cbd5e1;
  max-width: 680px;
  margin: 0 auto 32px;
  font-size: 1.05rem;
  line-height: 1.7;
}

/* 页脚 Footer & 核心任务 2: PBN 友链管道 */
.site-footer {
  background: #050811;
  border-top: 1px solid var(--border-color);
  padding: 64px 0 32px;
  margin-top: auto;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.3fr 2.7fr;
  gap: 48px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand p {
  margin-top: 14px;
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.75;
}

.footer-nav-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
}

.footer-col-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

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

.footer-col-links a:hover {
  color: #38bdf8;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 核心任务 2：页脚 PBN 友情链接区 - 低调、美观、小字号、并排、水平居中 */
.footer-pbn-links {
  text-align: center;
  padding: 18px 0 14px;
  font-size: 0.8rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-pbn-links .pbn-title {
  color: #475569;
}

.footer-pbn-links a {
  color: #64748b;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-pbn-links a:hover {
  color: #38bdf8;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer-copyright {
  text-align: center;
  padding-top: 14px;
  font-size: 0.82rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

@media (max-width: 900px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

@media (max-width: 600px) {
  .footer-nav-cols {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px 20px;
  }
}

/* 文章详情页样式 Prose */
.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

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

.breadcrumb-nav {
  margin-bottom: 16px;
  font-size: 0.86rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: #38bdf8;
}

.article-title {
  font-size: clamp(1.8rem, 3.2vw, 2.35rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.86rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}

.prose {
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.85;
}

.prose h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: #f8fafc;
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.01em;
}

.prose h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #e2e8f0;
  margin: 28px 0 14px;
}

.prose p {
  margin-bottom: 20px;
}

.prose ul, .prose ol {
  margin: 0 0 24px 24px;
}

.prose li {
  margin-bottom: 8px;
}

.prose a {
  color: #38bdf8;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  color: #7dd3fc;
}

.prose blockquote {
  border-left: 4px solid #0284c7;
  background: rgba(2, 132, 199, 0.08);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: #cbd5e1;
  font-style: normal;
}

.prose .callout {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 32px 0;
  text-align: center;
}

.article-related {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid var(--border-color);
}

.article-related h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.related-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.related-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.related-item a {
  font-weight: 600;
  font-size: 0.95rem;
  color: #f1f5f9;
  text-decoration: none;
  display: block;
}

.related-item a:hover {
  color: #38bdf8;
}

@media (max-width: 640px) {
  .related-list {
    grid-template-columns: 1fr;
  }
}