/* ==========================================================================
   OuO 网络加速器 - 浅色极简原生 CSS (Light Theme & Instant-Load)
   ========================================================================== */

:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --border-color: #e2e8f0;
  --border-hover: #0284c7;
  
  --primary-cyan: #0284c7;
  --primary-blue: #2563eb;
  --primary-gradient: linear-gradient(135deg, #0284c7 0%, #2563eb 55%, #4f46e5 100%);
  --accent-glow: rgba(37, 99, 235, 0.2);
  
  --text-main: #0f172a;
  --text-sub: #475569;
  --text-muted: #64748b;
  
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --container-max: 1180px;
}

/* 重置与基础设置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-stack);
  background-color: var(--bg-primary);
  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 15% 15%, rgba(2, 132, 199, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(37, 99, 235, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 50% 80%, rgba(79, 70, 229, 0.04) 0%, transparent 50%),
    var(--bg-primary);
}

a {
  color: inherit;
  text-decoration: none;
}

img, svg {
  display: inline-block;
  vertical-align: middle;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* 按钮通用样式 (移动端指触友好，高度>=48px) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 26px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.22s ease-in-out;
  text-align: center;
  border: 1px solid transparent;
  user-select: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
  filter: brightness(1.05);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid #cbd5e1;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.03);
}

.btn-secondary:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.06);
}

.btn-block {
  width: 100%;
}

/* 顶栏导航 */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  height: 72px;
  display: flex;
  align-items: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.logo-badge {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-tag {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--primary-cyan);
  background: rgba(2, 132, 199, 0.1);
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid rgba(2, 132, 199, 0.25);
}

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

.nav-link {
  color: var(--text-sub);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.nav-cta .btn {
  min-height: 40px;
  padding: 0 18px;
  font-size: 0.9rem;
}

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

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(2, 132, 199, 0.25);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--primary-cyan);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 20px;
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
  color: var(--text-main);
}

.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-sub);
  max-width: 740px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

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

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.05);
}

.metric-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.metric-val {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.2;
}

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

/* 分区通用排版 */
.section {
  padding: 90px 0;
  position: relative;
}

.section-alt {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 54px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--primary-cyan);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
  color: var(--text-main);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-sub);
}

/* 核心优势板块 */
.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-lg);
  padding: 32px 26px;
  transition: all 0.25s ease;
  position: relative;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.03);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(2, 132, 199, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary-cyan);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* 流媒体与 AI 支持板块 */
.media-ai-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.support-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
}

.support-header {
  margin-bottom: 24px;
}

.support-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.support-badge.stream {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.support-badge.ai {
  background: #ecfdf5;
  color: #059669;
  border: 1px solid #a7f3d0;
}

.support-card h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
}

.support-card p {
  color: var(--text-sub);
  font-size: 0.96rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  color: #334155;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}

.support-features {
  list-style: none;
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
}

.support-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-sub);
  margin-bottom: 10px;
}

.support-features li svg {
  color: var(--primary-cyan);
  flex-shrink: 0;
}

/* 套餐价格对比板块 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.25s ease;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.03);
}

.pricing-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.09);
}

.pricing-card.popular {
  border: 2px solid var(--primary-cyan);
  background: linear-gradient(180deg, rgba(2, 132, 199, 0.04) 0%, #ffffff 40%);
  box-shadow: 0 10px 30px rgba(2, 132, 199, 0.14);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 999px;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

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

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.currency {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--primary-cyan);
}

.price {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

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

.plan-features {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-bottom: 12px;
  line-height: 1.4;
}

.plan-features li svg {
  margin-top: 2px;
  flex-shrink: 0;
  color: var(--primary-cyan);
}

/* 用户评价板块 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.03);
}

.review-card:hover {
  transform: translateY(-3px);
  border-color: #cbd5e1;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
}

.stars {
  color: #f59e0b;
  font-size: 1rem;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

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

.avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: #e0f2fe;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--primary-cyan);
  border: 1px solid #bae6fd;
}

.reviewer-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

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

/* 常见问题 (FAQ) - 原生 details/summary，无需 JS */
.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-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.2s ease;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.02);
}

.faq-item:hover {
  border-color: #cbd5e1;
}

.faq-item[open] {
  border-color: #38bdf8;
  background: #ffffff;
  box-shadow: 0 6px 18px rgba(2, 132, 199, 0.08);
}

.faq-item summary {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--primary-cyan);
  transition: transform 0.2s ease;
  line-height: 1;
}

.faq-item[open] summary::after {
  content: "−";
  color: var(--primary-blue);
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.7;
  border-top: 1px solid #f1f5f9;
  margin-top: -4px;
  padding-top: 16px;
}

/* 底部 CTA 条 */
.bottom-cta-banner {
  margin: 70px 0 30px;
  padding: 50px 36px;
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.08) 0%, rgba(37, 99, 235, 0.1) 100%);
  border: 1px solid rgba(2, 132, 199, 0.25);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.06);
}

.bottom-cta-banner h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.bottom-cta-banner p {
  color: var(--text-sub);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto 28px;
}

/* 页脚 (严守用户要求：只保留四个标题，在新页面打开) */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  background: #ffffff;
  padding: 40px 0 32px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-nav-link {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-sub);
  transition: all 0.2s ease;
  position: relative;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
}

.footer-nav-link:hover {
  color: var(--primary-cyan);
  background: #f1f5f9;
}

.footer-bottom {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* 子页面规范排版 (关于我们、服务条款、隐私政策、网站地图) */
.legal-page {
  padding: 60px 0 90px;
}

.legal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  max-width: 900px;
  margin: 0 auto;
  box-shadow: 0 6px 24px rgba(15, 23, 42, 0.04);
}

.legal-card h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.legal-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.legal-section {
  margin-bottom: 36px;
}

.legal-section h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary-cyan);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.legal-section p {
  color: var(--text-sub);
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 12px;
}

.legal-section ul {
  padding-left: 22px;
  color: var(--text-sub);
  font-size: 0.98rem;
  line-height: 1.75;
  margin-bottom: 12px;
}

.legal-section li {
  margin-bottom: 8px;
}

.legal-highlight-box {
  background: rgba(2, 132, 199, 0.06);
  border-left: 4px solid var(--primary-cyan);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 18px 0;
  color: #1e293b;
}

/* 网站地图专用列表 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.sitemap-group {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-group h3 {
  font-size: 1.15rem;
  color: var(--text-main);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

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

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

.sitemap-links a {
  color: var(--text-sub);
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s;
}

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

.sitemap-group-full {
  grid-column: 1 / -1;
}

.sitemap-articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 20px;
  list-style: none;
}

.sitemap-articles-grid li {
  margin-bottom: 0;
}

.sitemap-articles-grid a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  line-height: 1.5;
}

/* ==========================================================================
   移动端响应式适配 (@media Queries)
   确保手机端完美单栏展示，按钮触控友好
   ========================================================================== */

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

@media (max-width: 768px) {
  .header {
    height: auto;
    padding: 10px 0 8px;
  }

  .nav-wrap {
    flex-wrap: wrap;
    gap: 8px;
  }

  .nav-menu {
    display: flex;
    overflow-x: auto;
    width: 100%;
    order: 3;
    gap: 16px;
    padding: 6px 0 2px;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

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

  .nav-link {
    font-size: 0.88rem;
    padding: 2px 4px;
  }
  
  .hero-section {
    padding: 50px 0 40px;
  }
  
  .hero-title {
    font-size: 2.1rem;
    line-height: 1.25;
  }
  
  .hero-sub {
    font-size: 1rem;
    margin-bottom: 28px;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  
  .hero-actions .btn {
    width: 100%;
  }

  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px;
  }

  .section {
    padding: 60px 0;
  }

  /* 核心优势手机端单栏 */
  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 流媒体与 AI 手机端单栏 */
  .media-ai-container {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* 套餐价格手机端单栏 */
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* 用户评价手机端单栏 */
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .faq-item summary {
    padding: 16px 18px;
    font-size: 0.98rem;
  }

  .faq-answer {
    padding: 0 18px 18px;
  }

  .bottom-cta-banner {
    padding: 36px 20px;
    margin: 40px 0 20px;
  }

  .bottom-cta-banner .btn {
    width: 100%;
  }

  /* 页脚手机端适配 */
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

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

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

  .legal-card {
    padding: 24px 18px;
  }
  
  .legal-card h1 {
    font-size: 1.7rem;
  }
}

/* ==========================================================================
   高科技网格卡片 (High-Tech Grid Cards) 布局
   ========================================================================== */

.seo-tech-section {
  margin-top: 50px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
}

.seo-tech-header {
  text-align: center;
  margin-bottom: 36px;
}

.seo-tech-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
  margin-bottom: 10px;
}

.seo-tech-desc {
  color: var(--text-sub);
  font-size: 1rem;
  max-width: 700px;
  margin: 0 auto;
}

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

.tech-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: all 0.28s ease;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.03);
}

.tech-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-gradient);
  opacity: 0.85;
  transition: height 0.25s ease;
}

.tech-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: 0 16px 36px rgba(2, 132, 199, 0.12);
}

.tech-card:hover::before {
  height: 5px;
}

.tech-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.tech-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--primary-cyan);
  border: 1px solid rgba(2, 132, 199, 0.2);
}

.tech-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.tech-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-main);
  margin-bottom: 12px;
  transition: color 0.2s;
}

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

.tech-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 22px;
  flex-grow: 1;
}

.tech-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid #f1f5f9;
}

.tech-words-tag {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.tech-card-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary-cyan);
  transition: transform 0.2s;
}

.tech-card:hover .tech-card-btn {
  transform: translateX(4px);
  color: var(--primary-blue);
}

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

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

/* ==========================================================================
   高科技公司视觉展示卡片 (OuO HQ Visual Card)
   ========================================================================== */

.company-visual-wrap {
  max-width: 960px;
  margin: 0 auto 36px;
  position: relative;
}

.company-visual-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
  background: #ffffff;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.company-visual-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 50px rgba(2, 132, 199, 0.15);
  border-color: var(--border-hover);
}

.company-visual-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.company-visual-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px 28px;
  background: linear-gradient(180deg, transparent 0%, rgba(15, 23, 42, 0.85) 100%);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: #ffffff;
}

.company-badge-glow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #ffffff;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
  display: inline-block;
  animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.company-visual-caption {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}

@media (max-width: 768px) {
  .company-visual-overlay {
    padding: 16px;
    flex-direction: column;
    align-items: flex-start;
  }
}