/* ========================================================
   天航机场 (TIANHANG.SBS) - 原生现代化高质感极速样式表
   零外部构建器 | 零重型库 | 100% 硬件加速秒开优化
   ======================================================== */

:root {
  --bg-primary: #060b18;
  --bg-secondary: #0a142c;
  --bg-card: rgba(14, 26, 54, 0.72);
  --bg-card-hover: rgba(20, 37, 77, 0.88);
  --border-card: rgba(56, 189, 248, 0.18);
  --border-card-hover: rgba(56, 189, 248, 0.55);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-cyan: #38bdf8;
  --accent-cyan-bright: #00f2fe;
  --accent-blue: #0284c7;
  --accent-deep-blue: #1d4ed8;
  --accent-gold: #f59e0b;
  --accent-green: #10b981;
  
  --grad-primary: linear-gradient(135deg, #38bdf8 0%, #0284c7 50%, #2563eb 100%);
  --grad-gold: linear-gradient(135deg, #fde047 0%, #f59e0b 100%);
  --grad-card-border: linear-gradient(135deg, rgba(56, 189, 248, 0.4), rgba(37, 99, 235, 0.1));

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.25);
  --shadow-gold: 0 0 25px rgba(245, 158, 11, 0.28);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  scroll-behavior: smooth;
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #0d1e40 0%, #060b18 70%);
}

/* 动态背景画布 */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.85;
}

/* 氛围流光大光晕 */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.28;
  animation: orbFloat 22s ease-in-out infinite alternate;
}

.glow-orb-1 {
  width: 550px;
  height: 550px;
  background: #0284c7;
  top: -10%;
  left: 15%;
}

.glow-orb-2 {
  width: 650px;
  height: 650px;
  background: #3b82f6;
  top: 40%;
  right: -10%;
  animation-duration: 28s;
  animation-direction: alternate-reverse;
}

.glow-orb-3 {
  width: 480px;
  height: 480px;
  background: #06b6d4;
  bottom: -10%;
  left: 10%;
  animation-duration: 20s;
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -60px) scale(1.1); }
  100% { transform: translate(-30px, 40px) scale(0.95); }
}

/* 通用容器 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 9999px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-primary);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(2, 132, 199, 0.45);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.65);
  filter: brightness(1.1);
}

.btn-secondary {
  background: rgba(15, 30, 60, 0.75);
  color: #38bdf8;
  border-color: rgba(56, 189, 248, 0.35);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: #38bdf8;
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-gold {
  background: var(--grad-gold);
  color: #0f172a;
  box-shadow: 0 4px 18px rgba(245, 158, 11, 0.4);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(245, 158, 11, 0.65);
  filter: brightness(1.08);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.08rem;
  letter-spacing: 0.5px;
}

.btn-pulse {
  animation: btnGlowPulse 2.8s infinite;
}

@keyframes btnGlowPulse {
  0%, 100% { box-shadow: 0 0 16px rgba(56, 189, 248, 0.4); }
  50% { box-shadow: 0 0 30px rgba(56, 189, 248, 0.85); }
}

/* 顶部导航栏 (左上方带有天航专属 Logo) */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  background: rgba(6, 11, 24, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(56, 189, 248, 0.15);
  transition: all 0.3s ease;
}

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

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: transform 0.2s ease;
}

.logo-link:hover {
  transform: scale(1.02);
}

.logo-img {
  height: 48px;
  width: auto;
  display: block;
}

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

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: width 0.2s ease;
  border-radius: 2px;
}

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

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

/* 英雄区 (Hero Section) */
.hero-section {
  padding: 85px 0 65px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: 9999px;
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: var(--accent-cyan);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 22px;
  background: linear-gradient(135deg, #ffffff 20%, #e0f2fe 60%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.18rem;
  line-height: 1.75;
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 38px;
}

.hero-subtitle strong {
  color: #e2e8f0;
  font-weight: 600;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

/* 核心状态指标栏 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 980px;
  margin: 0 auto;
}

.stat-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  padding: 20px 16px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.stat-item:hover {
  transform: translateY(-3px);
  border-color: var(--border-card-hover);
  background: var(--bg-card-hover);
}

.stat-num {
  font-size: 1.95rem;
  font-weight: 800;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  margin-bottom: 6px;
}

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

/* 通用章节规范 */
section {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 55px;
}

.section-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 9999px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--accent-cyan);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.35;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.04rem;
  color: var(--text-muted);
  line-height: 1.7;
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 20px;
  padding: 32px 26px;
  backdrop-filter: blur(12px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

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

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: rgba(14, 165, 233, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.7rem;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

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

/* 全球节点延迟透明监控区 */
.nodes-monitor-box {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 20px;
  padding: 16px;
  backdrop-filter: blur(12px);
  overflow-x: auto;
}

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

.nodes-table th, .nodes-table td {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nodes-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  background: rgba(255, 255, 255, 0.02);
}

.nodes-table tbody tr:hover {
  background: rgba(56, 189, 248, 0.05);
}

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

.node-name {
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-flag {
  font-size: 1.2rem;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
}

.status-online {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
}

.tag-stream {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: #7dd3fc;
  font-size: 0.78rem;
  margin-right: 4px;
}

/* ========================================================
   核心定价区 (PRICING SECTION)
   严格执行：所有价格同排一览 (横向 4 列等高对齐)
   ======================================================== */
.pricing-section {
  background: linear-gradient(180deg, rgba(6, 11, 24, 0.4) 0%, rgba(10, 20, 44, 0.6) 100%);
}

.pricing-grid-same-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch; /* 保证所有卡片同排等高 */
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 22px;
  padding: 30px 24px 26px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

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

/* 推荐热卖卡片高亮 */
.pricing-card.featured {
  border-color: rgba(56, 189, 248, 0.65);
  background: rgba(14, 30, 66, 0.92);
  box-shadow: 0 0 30px rgba(2, 132, 199, 0.35);
  transform: translateY(-4px);
}

.pricing-card.featured:hover {
  transform: translateY(-10px);
  box-shadow: 0 0 45px rgba(56, 189, 248, 0.55);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--grad-gold);
  color: #0f172a;
  padding: 4px 16px;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.6px;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
  white-space: nowrap;
}

.plan-header {
  margin-bottom: 20px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 42px;
  line-height: 1.5;
}

.plan-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding: 16px 0 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 22px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.price-num {
  font-size: 2.85rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: #ffffff;
  line-height: 1;
}

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

.price-discount {
  margin-left: auto;
  font-size: 0.78rem;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.35);
  font-weight: 600;
}

.plan-features {
  list-style: none;
  margin-bottom: 26px;
  flex-grow: 1; /* 顶开底部操作区，保证CTA按钮对齐 */
}

.plan-features li {
  font-size: 0.9rem;
  color: #cbd5e1;
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.5;
}

.plan-features li strong {
  color: #ffffff;
}

.feature-check {
  color: #10b981;
  font-weight: 900;
  font-size: 1rem;
  flex-shrink: 0;
}

.plan-action {
  margin-top: auto;
}

.plan-action .btn {
  width: 100%;
}

/* 客户端导入生态区 (Clash / Clash Party / Sing-box / 小火箭) */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 18px;
  padding: 24px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all 0.25s ease;
}

.client-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-card-hover);
  background: var(--bg-card-hover);
}

.client-icon {
  font-size: 2.5rem;
  margin-bottom: 14px;
}

.client-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.client-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 16px;
}

.client-os {
  display: flex;
  justify-content: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--accent-cyan);
}

/* 博客/机场评测文章区 (Articles Grid) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 20px;
  padding: 26px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.article-category {
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(14, 165, 233, 0.15);
  color: var(--accent-cyan);
  font-weight: 600;
}

.article-title-link {
  color: #ffffff;
  text-decoration: none;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
  display: block;
  transition: color 0.2s ease;
}

.article-title-link:hover {
  color: var(--accent-cyan);
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.article-read-more {
  color: var(--accent-cyan);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s ease;
}

.article-read-more:hover {
  gap: 8px;
  color: #ffffff;
}

.articles-more-wrap {
  text-align: center;
  margin-top: 40px;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 18px;
  padding: 26px;
  backdrop-filter: blur(10px);
  transition: transform 0.25s ease;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-card-hover);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.review-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: #ffffff;
}

.review-author {
  font-weight: 700;
  color: #ffffff;
  font-size: 1rem;
}

.review-role {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.review-stars {
  color: #fbbf24;
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.review-content {
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.65;
}

/* 常见问题 FAQ 展开折叠区 */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color 0.25s ease;
}

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

.faq-question {
  width: 100%;
  padding: 22px 24px;
  text-align: left;
  background: transparent;
  border: none;
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  outline: none;
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--accent-cyan);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  background: rgba(6, 11, 24, 0.4);
}

.faq-answer-inner {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
}

.faq-answer-inner strong {
  color: #e2e8f0;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

/* 底部行动召唤横幅 (Bottom CTA Banner) */
.bottom-cta-section {
  padding: 70px 0;
}

.bottom-cta-card {
  background: linear-gradient(135deg, rgba(14, 30, 66, 0.95) 0%, rgba(2, 132, 199, 0.25) 100%);
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: 28px;
  padding: 55px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 45px rgba(2, 132, 199, 0.3);
}

.bottom-cta-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
}

.bottom-cta-desc {
  font-size: 1.1rem;
  color: #cbd5e1;
  max-width: 680px;
  margin: 0 auto 32px;
}

/* 页脚 (Site Footer) */
.site-footer {
  background: #040813;
  border-top: 1px solid rgba(56, 189, 248, 0.15);
  padding: 70px 0 30px;
  font-size: 0.9rem;
}

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

.footer-brand p {
  color: var(--text-muted);
  margin-top: 16px;
  line-height: 1.7;
  max-width: 320px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

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

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-dim);
  font-size: 0.84rem;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom a {
  color: var(--text-muted);
  text-decoration: none;
}

.footer-bottom a:hover {
  color: var(--accent-cyan);
}

/* 响应式适配 (Media Queries) */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.5rem;
  }
  .pricing-grid-same-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .site-header {
    height: 64px;
  }
  .header-inner {
    height: 64px;
  }
  .logo-img {
    height: 40px;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #060b18;
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(56, 189, 248, 0.2);
  }
  .nav-menu.show {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid-same-row {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .bottom-cta-card {
    padding: 40px 20px;
  }
  .bottom-cta-title {
    font-size: 1.8rem;
  }
}