/* 吹雪云官网 - ChuiXue Cloud 官方样式表 */
:root {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --accent-cyan: #06b6d4;
  --accent-ice: #38bdf8;
  --snow-bg: #f8fafc;
  --snow-card: rgba(255, 255, 255, 0.88);
  --snow-border: rgba(186, 230, 253, 0.65);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #64748b;
  --shadow-sm: 0 2px 8px rgba(14, 165, 233, 0.06);
  --shadow-md: 0 8px 24px rgba(14, 165, 233, 0.10);
  --shadow-lg: 0 16px 36px rgba(14, 165, 233, 0.14);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

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

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

body {
  position: relative;
  overflow-x: hidden;
  min-height: 100vh;
  background: radial-gradient(circle at 10% 20%, rgba(224, 242, 254, 0.45) 0%, transparent 40%),
              radial-gradient(circle at 90% 80%, rgba(207, 250, 254, 0.5) 0%, transparent 45%),
              linear-gradient(180deg, #f0f9ff 0%, #f8fafc 15%, #ffffff 50%, #f0f9ff 100%);
}

/* 顶部微光与雪花画布 */
#snow-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* 顶部导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(186, 230, 253, 0.5);
  box-shadow: 0 2px 12px rgba(14, 165, 233, 0.04);
  transition: all 0.3s ease;
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.25rem;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.nav-tagline {
  font-size: 0.75rem;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 600;
  margin-left: 6px;
}

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

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.2s ease;
  border-radius: 2px;
}

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

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-main);
  font-size: 1.5rem;
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  font-size: 0.95rem;
  line-height: 1.2;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1 0%, #075985 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.4);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.9);
  color: var(--primary);
  border: 1px solid var(--snow-border);
  box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
  background: #f0f9ff;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
}

/* 核心板块标题 */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary);
  border: 1px solid rgba(14, 165, 233, 0.25);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 16px;
  line-height: 1.25;
}

.section-title .text-gradient {
  background: linear-gradient(135deg, #0284c7 0%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Hero 板块 */
.hero-section {
  padding: 80px 0 90px 0;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--snow-border);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  color: var(--primary);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  animation: pulse-glow 3s infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 2px 10px rgba(14, 165, 233, 0.1); }
  50% { box-shadow: 0 4px 18px rgba(14, 165, 233, 0.25); }
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--text-main);
}

.hero-title span {
  background: linear-gradient(135deg, #0284c7 0%, #06b6d4 50%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 36px auto;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  border: 1px solid var(--snow-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

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

.stat-number {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-light);
  font-weight: 500;
}

/* 优势板块 */
.features-section {
  padding: 90px 0;
}

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

.feature-card {
  background: var(--snow-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--snow-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #38bdf8, #0284c7);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(14, 165, 233, 0.4);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: var(--primary);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

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

/* 节点状态板块 */
.nodes-section {
  padding: 90px 0;
  background: linear-gradient(180deg, rgba(240, 249, 255, 0.5) 0%, rgba(255, 255, 255, 0.8) 100%);
}

.nodes-dashboard {
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--snow-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.dashboard-header {
  padding: 20px 28px;
  background: #f8fafc;
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.dashboard-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #16a34a;
  background: #dcfce7;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.live-dot {
  width: 8px;
  height: 8px;
  background: #16a34a;
  border-radius: 50%;
  animation: pulse-dot 1.5s infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.8; }
}

.nodes-table-wrap {
  overflow-x: auto;
}

.nodes-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.nodes-table th {
  background: #f1f5f9;
  padding: 14px 24px;
  color: var(--text-light);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid #e2e8f0;
}

.nodes-table td {
  padding: 16px 24px;
  border-bottom: 1px solid #f1f5f9;
  color: var(--text-main);
}

.nodes-table tr:hover {
  background-color: #f8fafc;
}

.node-info-col {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
}

.node-flag {
  font-size: 1.3rem;
}

.node-badge {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.badge-iplc {
  background: #e0f2fe;
  color: #0284c7;
  border: 1px solid #bae6fd;
}

.badge-bgp {
  background: #f3e8ff;
  color: #7e22ce;
  border: 1px solid #e9d5ff;
}

.latency-val {
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-weight: 700;
  color: #16a34a;
}

.latency-val.medium {
  color: #ca8a04;
}

.latency-val.high {
  color: #0284c7;
}

.load-bar-wrap {
  width: 110px;
  height: 8px;
  background: #e2e8f0;
  border-radius: var(--radius-full);
  overflow: hidden;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
}

.load-bar {
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, #22c55e, #3b82f6);
}

/* 套餐价格板块 */
.pricing-section {
  padding: 90px 0;
}

.pricing-billing-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
}

.switch-pill {
  background: #e2e8f0;
  padding: 4px;
  border-radius: var(--radius-full);
  display: inline-flex;
}

.switch-btn {
  border: none;
  background: transparent;
  padding: 8px 22px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.switch-btn.active {
  background: #ffffff;
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.discount-tag {
  background: #fee2e2;
  color: #dc2626;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 700;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
}

.pricing-card {
  background: var(--snow-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--snow-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  border: 2px solid var(--primary);
  background: #ffffff;
  box-shadow: 0 12px 32px rgba(2, 132, 199, 0.18);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #0284c7, #06b6d4);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

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

.pricing-plan-desc {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 24px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  margin-bottom: 24px;
}

.pricing-currency {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
}

.pricing-amount {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  margin: 0 4px;
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.pricing-period {
  font-size: 0.95rem;
  color: var(--text-light);
}

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

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.pricing-features li .check-icon {
  color: #10b981;
  font-weight: 800;
  font-size: 1.1rem;
}

/* 用户评价板块 */
.reviews-section {
  padding: 90px 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.6) 0%, rgba(240, 249, 255, 0.8) 100%);
}

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

.review-card {
  background: #ffffff;
  border: 1px solid var(--snow-border);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s ease;
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.review-stars {
  color: #f59e0b;
  font-size: 1.1rem;
  margin-bottom: 14px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #e0f2fe;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--primary);
  font-size: 1.1rem;
}

.author-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.author-role {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* 常见问题板块 */
.faq-section {
  padding: 90px 0;
}

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

.faq-item {
  background: #ffffff;
  border: 1px solid var(--snow-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 22px 26px;
  background: none;
  border: none;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-question:hover {
  color: var(--primary);
}

.faq-icon {
  font-size: 1.3rem;
  transition: transform 0.3s ease;
  color: var(--primary);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 26px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  padding: 0 26px 22px 26px;
  max-height: 500px;
}

/* 知识库与文章网格 */
.articles-section {
  padding: 90px 0;
  background: #f8fafc;
}

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

.article-card {
  background: #ffffff;
  border: 1px solid var(--snow-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(14, 165, 233, 0.4);
}

.article-card-cover {
  height: 140px;
  background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 50%, #7dd3fc 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.article-card-cover::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, transparent 60%);
  transform: rotate(30deg);
}

.article-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 12px;
}

.article-tag {
  background: #e0f2fe;
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 10px;
  color: var(--text-main);
  transition: color 0.2s ease;
}

.article-card:hover .article-card-title {
  color: var(--primary);
}

.article-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
}

/* 页脚 */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 70px 0 30px 0;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand h3 {
  color: #ffffff;
  font-size: 1.3rem;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-brand p {
  line-height: 1.65;
  margin-bottom: 20px;
  max-width: 320px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 18px;
}

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

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #38bdf8;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
}

/* 文章详情页专用样式 */
.article-header {
  padding: 60px 0 40px 0;
  border-bottom: 1px solid var(--snow-border);
  background: linear-gradient(180deg, #f0f9ff 0%, #ffffff 100%);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 20px;
}

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

.article-title-main {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text-main);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--text-light);
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.article-content-wrapper {
  padding: 60px 0 80px 0;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #334155;
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 800;
  margin: 40px 0 18px 0;
  color: var(--text-main);
  border-left: 4px solid var(--primary);
  padding-left: 14px;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 28px 0 14px 0;
  color: var(--text-main);
}

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

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

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

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95rem;
}

.article-body table th, .article-body table td {
  border: 1px solid #e2e8f0;
  padding: 12px 16px;
}

.article-body table th {
  background: #f8fafc;
  font-weight: 700;
  color: var(--text-main);
}

.article-body .callout {
  background: #f0f9ff;
  border-left: 4px solid var(--primary);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
}

.article-sidebar {
  position: sticky;
  top: 96px;
  height: fit-content;
}

.sidebar-box {
  background: #ffffff;
  border: 1px solid var(--snow-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.sidebar-box h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
  border-bottom: 2px solid #f1f5f9;
  padding-bottom: 8px;
}

.sidebar-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
}

.sidebar-links a {
  color: var(--text-muted);
  text-decoration: none;
  display: block;
  transition: color 0.2s ease;
}

.sidebar-links a:hover {
  color: var(--primary);
}

/* 响应式断点 */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.8rem; }
  .features-grid, .pricing-grid, .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured { transform: none; }
  .pricing-card.featured:hover { transform: translateY(-8px); }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: block; }
  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    padding: 20px 24px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
    border-bottom: 1px solid var(--snow-border);
    gap: 16px;
  }
  .hero-title { font-size: 2.2rem; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .features-grid, .pricing-grid, .reviews-grid, .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 1.85rem; }
  .article-title-main { font-size: 1.85rem; }
}