/* ===================================================================
   自由猫 FreeCat - 纯原生 CSS 极速样式表
   零重型依赖，秒开级加载，全平台自适应
   =================================================================== */

:root {
  --bg-dark: #0a0d14;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(28, 36, 56, 0.9);
  --bg-card-solid: #121826;
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-light: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(99, 102, 241, 0.4);
  --border-active: #6366f1;
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.35);
  
  --secondary: #06b6d4;
  --accent-purple: #a855f7;
  --accent-pink: #ec4899;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-sub: #64748b;

  --gradient-main: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --gradient-cyan: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --gradient-dark: linear-gradient(180deg, rgba(18, 24, 38, 0.6) 0%, rgba(10, 13, 20, 0.9) 100%);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --container-max: 1200px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 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-dark);
  color: var(--text-main);
  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 15% 15%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(168, 85, 247, 0.1) 0%, transparent 35%),
    radial-gradient(circle at 50% 85%, rgba(6, 182, 212, 0.08) 0%, transparent 45%),
    var(--bg-dark);
}

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

ul {
  list-style: none;
}

img, svg {
  vertical-align: middle;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 顶部导航条 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 13, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: var(--gradient-main);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px var(--primary-glow);
}

.brand-text {
  background: linear-gradient(90deg, #fff, #c7d2fe);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-text span {
  font-size: 0.85rem;
  color: var(--secondary);
  -webkit-text-fill-color: var(--secondary);
  margin-left: 4px;
  font-weight: 500;
}

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

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: #fff;
}

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

/* 通用按钮组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(99, 102, 241, 0.5);
  color: #fff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-light);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: translateY(-2px);
}

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

.btn-block {
  width: 100%;
}

/* 主视觉区 Hero */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: #c7d2fe;
  margin-bottom: 24px;
}

.hero-badge-pulse {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-green);
}

.hero-title {
  font-size: 3.2rem;
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -1px;
  max-width: 900px;
  margin: 0 auto 20px;
}

.text-gradient {
  background: var(--gradient-main);
  -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;
  line-height: 1.65;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
}

/* 数据统计条 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 980px;
  margin: 0 auto 60px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(12px);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  border-right: 1px solid var(--border-light);
}

.stat-item:last-child {
  border-right: none;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 动态终端/网络仪表板展示卡 */
.hero-dashboard-preview {
  max-width: 920px;
  margin: 0 auto;
  background: #0f1422;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.8), 0 0 30px rgba(99, 102, 241, 0.15);
  overflow: hidden;
  text-align: left;
}

.dashboard-header {
  background: #171f33;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
}

.window-dots {
  display: flex;
  gap: 8px;
}

.window-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.window-dot.red { background: #ef4444; }
.window-dot.yellow { background: #f59e0b; }
.window-dot.green { background: #10b981; }

.dashboard-title {
  font-size: 0.8rem;
  color: var(--text-sub);
  font-family: monospace;
}

.dashboard-body {
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.dash-node {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: var(--transition);
}

.dash-node:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.06);
}

.dash-node-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.dash-node-name {
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.dash-ping {
  font-size: 0.8rem;
  color: var(--accent-green);
  font-weight: 600;
  background: rgba(16, 185, 129, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

.dash-node-type {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.dash-speed-bar {
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  margin-top: 10px;
  overflow: hidden;
}

.dash-speed-fill {
  height: 100%;
  background: var(--gradient-main);
  border-radius: 2px;
}

/* 区块通用标题 */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--secondary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.6;
}

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

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

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-main);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.6);
}

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

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.icon-purple { background: rgba(99, 102, 241, 0.15); color: #818cf8; }
.icon-cyan { background: rgba(6, 182, 212, 0.15); color: #22d3ee; }
.icon-pink { background: rgba(236, 72, 153, 0.15); color: #f472b6; }
.icon-green { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.icon-orange { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.icon-blue { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }

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

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

/* 流媒体与 AI 支持专区 */
.media-ai-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.media-ai-box {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px;
  position: relative;
  overflow: hidden;
}

.media-ai-box.glow-purple {
  background: radial-gradient(circle at top right, rgba(168, 85, 247, 0.12) 0%, rgba(18, 24, 38, 0.8) 60%);
}

.media-ai-box.glow-cyan {
  background: radial-gradient(circle at top right, rgba(6, 182, 212, 0.12) 0%, rgba(18, 24, 38, 0.8) 60%);
}

.media-ai-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.media-ai-title {
  font-size: 1.45rem;
  font-weight: 800;
}

.media-ai-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 26px;
  line-height: 1.6;
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.service-tag {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  transition: var(--transition);
}

.service-tag:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.service-highlight-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 20px;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.highlight-item svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

/* 套餐价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.7);
}

.pricing-card.popular {
  background: radial-gradient(circle at top center, rgba(99, 102, 241, 0.2) 0%, rgba(18, 24, 38, 0.9) 70%);
  border-color: var(--primary);
  box-shadow: 0 0 30px rgba(99, 102, 241, 0.25);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-main);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 40px;
  margin-bottom: 20px;
}

.plan-price-box {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.plan-price {
  font-size: 2.4rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.plan-price span.currency {
  font-size: 1.3rem;
  font-weight: 600;
  vertical-align: super;
  margin-right: 2px;
}

.plan-price span.period {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: normal;
}

.plan-features {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.plan-feature-item svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

.plan-feature-item.highlight {
  color: #fff;
  font-weight: 600;
}

/* 用户评价 Social Proof */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.review-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-3px);
}

.review-stars {
  color: var(--accent-orange);
  font-size: 1.05rem;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.review-quote {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.65;
  margin-bottom: 22px;
}

.reviewer-profile {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
}

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #fff;
}

.reviewer-avatar.purple { background: var(--gradient-main); }
.reviewer-avatar.green { background: linear-gradient(135deg, #10b981, #06b6d4); }

.reviewer-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.reviewer-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 常见问题解答 FAQ */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

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

.faq-question {
  padding: 18px 22px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

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

.faq-icon {
  font-size: 1.25rem;
  color: var(--primary);
  transition: transform 0.25s ease;
}

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

.faq-answer {
  padding: 0 22px 20px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 14px;
}

/* 底部 CTA 通栏 */
.bottom-cta-banner {
  background: radial-gradient(circle at center, rgba(99, 102, 241, 0.25) 0%, rgba(18, 24, 38, 0.95) 75%);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  margin: 60px 0 20px;
  box-shadow: 0 0 40px rgba(99, 102, 241, 0.15);
}

.bottom-cta-banner h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.bottom-cta-banner p {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 30px;
}

/* 页脚 Footer - 严格保留4个标题，新页面打开展示 */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-light);
  background: #07090e;
  padding: 40px 0 30px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

.footer-brand {
  font-size: 1.2rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 严格限定：页脚仅保留四个标题链接 */
.footer-nav-exact {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 32px;
}

.footer-nav-exact a {
  color: #cbd5e1;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 6px;
}

.footer-nav-exact a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-sub);
}

/* ===================================================================
   独立子页面通用样式 (关于我们、服务条款、隐私政策、网站地图)
   =================================================================== */
.subpage-hero {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-light);
  background: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 60%);
}

.subpage-hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 14px;
}

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

.subpage-content {
  padding: 50px 0 80px;
  max-width: 860px;
  margin: 0 auto;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 30px;
}

.article-card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 20px 0 10px;
  color: #e2e8f0;
}

.article-card p {
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.article-card ul, .article-card ol {
  margin: 12px 0 20px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.article-card li {
  margin-bottom: 10px;
  line-height: 1.6;
}

.alert-box {
  background: rgba(99, 102, 241, 0.08);
  border-left: 4px solid var(--primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 20px 0;
}

.alert-box.danger {
  background: rgba(239, 68, 68, 0.08);
  border-left-color: #ef4444;
}

.alert-box.success {
  background: rgba(16, 185, 129, 0.08);
  border-left-color: #10b981;
}

.alert-box p {
  margin-bottom: 0;
  color: #e2e8f0;
  font-size: 0.92rem;
}

/* 网站地图索引样式 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

.sitemap-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
}

.sitemap-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sitemap-links a {
  color: var(--text-muted);
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sitemap-links a:hover {
  color: var(--secondary);
  transform: translateX(4px);
}

/* ===================================================================
   响应式媒体查询适配 (@media)
   针对移动端与平板设备极致优化，保证单栏、按钮大触控区
   =================================================================== */

/* 平板尺寸 (<= 1024px) */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.7rem;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 20px;
  }
  .stat-item:nth-child(2) {
    border-right: none;
  }
}

.nav-consult-link {
  color: var(--secondary) !important;
  font-weight: 600;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-consult-link::after {
  content: "NEW";
  font-size: 0.65rem;
  background: var(--gradient-main);
  color: #fff;
  padding: 1px 5px;
  border-radius: 4px;
  font-weight: 700;
  line-height: 1.2;
}

/* 手机竖屏尺寸 (<= 768px) - 严格单栏化显示与横向滑动目录 */
@media (max-width: 768px) {
  .nav-inner {
    height: auto;
    padding-top: 12px;
    padding-bottom: 10px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .nav-links {
    display: flex;
    order: 3;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    gap: 14px;
    padding: 6px 4px 4px;
    -webkit-overflow-scrolling: touch;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-links a {
    font-size: 0.88rem;
    color: var(--text-muted);
    flex-shrink: 0;
  }

  .hero-section {
    padding: 50px 0 40px;
  }

  .hero-title {
    font-size: 2rem;
    line-height: 1.25;
  }

  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: 28px;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px; /* 适合手指点击的大触控区 */
    font-size: 1.05rem;
  }

  .hero-stats {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 18px;
  }

  .stat-item {
    border-right: none;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 12px;
  }

  .stat-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  .dashboard-body {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .features-grid {
    grid-template-columns: 1fr; /* 完美单栏 */
    gap: 16px;
  }

  .media-ai-container {
    grid-template-columns: 1fr; /* 完美单栏 */
    gap: 20px;
  }

  .pricing-grid {
    grid-template-columns: 1fr; /* 完美单栏 */
    gap: 24px;
  }

  .pricing-card {
    padding: 28px 20px;
  }

  .reviews-grid {
    grid-template-columns: 1fr; /* 完美单栏 */
    gap: 16px;
  }

  .sitemap-grid {
    grid-template-columns: 1fr;
  }

  .footer-nav-exact {
    gap: 18px;
    flex-direction: column; /* 手机端竖向单栏对齐 */
  }

  .footer-nav-exact a {
    font-size: 1rem;
    padding: 8px 16px;
    width: 100%;
    text-align: center;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
  }

  .bottom-cta-banner {
    padding: 40px 20px;
  }

  .bottom-cta-banner h2 {
    font-size: 1.7rem;
  }

  .btn {
    min-height: 48px; /* 移动端标准触控尺寸 (WCAG AAA) */
  }
}

/* 超小屏尺寸 (<= 480px) */
@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }
  
  .article-card {
    padding: 24px 18px;
  }

  .subpage-hero h1 {
    font-size: 2rem;
  }
}

/* ===================================================================
   高科技网格卡片 (Tech Grid Cards) & SEO 文章目录样式
   =================================================================== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 28px 0;
}

.tech-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 22px;
  transition: var(--transition);
}

.tech-card:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.06);
  transform: translateY(-3px);
}

.tech-card-icon {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.tech-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #fff;
}

.tech-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 推荐咨询页面 12 篇文章网格卡片展示 */
.articles-catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 36px 0;
}

.article-thumb-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.article-thumb-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 16px 36px -10px rgba(0, 0, 0, 0.6);
}

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

.article-tag {
  background: rgba(99, 102, 241, 0.15);
  color: #c7d2fe;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}

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

.article-thumb-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

.read-more-link {
  color: var(--secondary);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.read-more-link:hover {
  color: #fff;
  transform: translateX(3px);
}

.back-consult-btn-wrap {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 24px;
}

@media (max-width: 1024px) {
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-catalog-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .tech-grid { grid-template-columns: 1fr; }
  .articles-catalog-grid { grid-template-columns: 1fr; }
}