/* ==========================================================================
   阿达西 (Adaxitz) 网络加速器 - 统一原生 CSS 样式表 (现代商务亮色版)
   特点: 极简纯原生 CSS, 引入 Google Fonts (Plus Jakarta Sans), 现代轻奢亮色极简风格, 响应式
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400;1,600&display=swap');

/* 1. 全局变量定义 (现代极简亮色 Slate & Vibrant Indigo) */
:root {
  --bg-dark: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-nav: rgba(255, 255, 255, 0.88);
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #6366f1;
  --accent-cyan: #0284c7;
  --accent-emerald: #059669;
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #2563eb 50%, #0284c7 100%);
  --card-gradient: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;
  --border-color: rgba(226, 232, 240, 0.9);
  --border-active: rgba(99, 102, 241, 0.4);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 6px 20px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 16px 36px -6px rgba(15, 23, 42, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
  --shadow-glow: 0 10px 30px rgba(79, 70, 229, 0.12);
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --max-width: 1200px;
}

/* 2. 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

/* 3. 布局与容器 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5.5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: rgba(79, 70, 229, 0.08);
  border: 1px solid rgba(79, 70, 229, 0.2);
  color: var(--primary);
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 0.85rem;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 0.85rem;
  color: var(--text-main);
}

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

/* 4. 按钮组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.38);
  opacity: 0.96;
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid #cbd5e1;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.04);
}

.btn-secondary:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1.05rem 2.25rem;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* 5. 顶部导航栏 (Header Nav) */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 12px rgba(15, 23, 42, 0.03);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.03em;
}

.logo-icon {
  width: 2.25rem;
  height: 2.25rem;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 900;
  font-size: 1.15rem;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.85rem;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  transition: color 0.2s;
}

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

/* 6. 主视觉区 (Hero Section) */
.hero {
  padding-top: 9rem;
  padding-bottom: 6rem;
  background: radial-gradient(circle at 50% -10%, rgba(99, 102, 241, 0.12) 0%, rgba(248, 250, 252, 0) 70%), linear-gradient(180deg, #eef2ff 0%, #f8fafc 100%);
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero-left {
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.1rem;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(2, 132, 199, 0.2);
  color: var(--accent-cyan);
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.04em;
  margin-bottom: 1.25rem;
  color: var(--text-main);
}

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

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.hero-features-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  padding: 1.25rem;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
}

.hero-feature-item svg {
  color: var(--accent-emerald);
  width: 1.15rem;
  height: 1.15rem;
  flex-shrink: 0;
}

/* 右侧动态图卡 */
.hero-right {
  position: relative;
}

.dynamic-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  position: relative;
  overflow: hidden;
  animation: floatCard 6s ease-in-out infinite alternate;
}

@keyframes floatCard {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-8px); }
}

.card-status-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.25rem;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

.pulse-dot {
  width: 0.7rem;
  height: 0.7rem;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulseDot 1.8s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.7); }
  70% { transform: scale(1.15); box-shadow: 0 0 0 8px rgba(5, 150, 105, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(5, 150, 105, 0); }
}

.speed-tag {
  font-size: 0.8rem;
  font-family: monospace;
  background: rgba(2, 132, 199, 0.1);
  color: var(--accent-cyan);
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  border: 1px solid rgba(2, 132, 199, 0.25);
  font-weight: 700;
}

.node-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.node-item:hover {
  border-color: var(--primary);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

.flag-icon {
  font-size: 1.1rem;
}

.ping-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--accent-emerald);
  font-weight: 700;
  font-family: monospace;
}

.ping-signal {
  width: 40px;
  height: 6px;
  background: #e2e8f0;
  border-radius: 3px;
  overflow: hidden;
  position: relative;
}

.ping-fill {
  height: 100%;
  width: 90%;
  background: var(--accent-emerald);
  border-radius: 3px;
}

.card-footer-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  text-align: center;
  background: rgba(79, 70, 229, 0.05);
  border: 1px solid rgba(79, 70, 229, 0.15);
  border-radius: var(--radius-sm);
  padding: 0.85rem 0.5rem;
}

.stat-box h5 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-main);
}

.stat-box p {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* 7. 产品核心优势 (Features Section) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  transition: all 0.3s ease;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-active);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  background: #ffffff;
}

.feature-icon-wrapper {
  width: 3.25rem;
  height: 3.25rem;
  background: rgba(79, 70, 229, 0.08);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--primary);
}

.feature-icon-wrapper svg {
  width: 1.65rem;
  height: 1.65rem;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

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

/* 8. 流媒体与 AI 支持 */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.unlock-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

.unlock-card-header h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.unlock-card-header p {
  color: var(--text-muted);
  font-size: 0.925rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.25rem;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  background: #f1f5f9;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  transition: all 0.2s ease;
}

.tag-item:hover {
  border-color: var(--primary);
  background: var(--primary);
  color: #ffffff;
}

/* 9. 价格表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

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

.pricing-card.popular {
  border-color: var(--primary);
  background: linear-gradient(180deg, rgba(79, 70, 229, 0.06) 0%, var(--bg-card) 45%);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 0.9rem;
  border-radius: 9999px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
}

.pricing-header {
  text-align: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.pricing-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.pricing-price span {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
}

.pricing-desc {
  font-size: 0.825rem;
  color: var(--text-muted);
}

.pricing-features {
  margin-bottom: 1.75rem;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.85rem;
  font-size: 0.875rem;
  color: var(--text-main);
}

.pricing-feature-item svg {
  width: 1.05rem;
  height: 1.05rem;
  color: var(--accent-emerald);
  flex-shrink: 0;
}

/* 10. SEO 图卡文章 Section */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  background: #ffffff;
}

.article-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(2, 132, 199, 0.2);
  color: var(--accent-cyan);
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 1rem;
  width: fit-content;
}

.article-card-icon {
  width: 2.75rem;
  height: 2.75rem;
  background: rgba(79, 70, 229, 0.08);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 1rem;
}

.article-card-icon svg {
  width: 1.4rem;
  height: 1.4rem;
}

.article-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-excerpt {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.read-more-link {
  color: var(--primary);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: color 0.2s;
}

.read-more-link:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* 11. 用户评价 Section */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

.review-stars {
  color: #d97706;
  display: flex;
  gap: 0.2rem;
  margin-bottom: 0.85rem;
}

.review-content {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.avatar-placeholder {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
  font-size: 0.95rem;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
}

.user-info h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

.user-info p {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* 12. FAQ Section */
.faq-grid {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.faq-question svg {
  color: var(--primary);
  width: 1.2rem;
  height: 1.2rem;
  flex-shrink: 0;
}

.faq-answer {
  color: var(--text-muted);
  font-size: 0.925rem;
  line-height: 1.65;
  padding-left: 1.9rem;
}

/* 13. 页脚 */
.footer {
  background: #f1f5f9;
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2.5rem;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.2s;
  padding: 0.5rem;
}

.footer-link:hover {
  color: var(--primary);
  text-decoration: underline;
}

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

/* 14. 子页面通用样式 */
.page-header {
  padding-top: 8.5rem;
  padding-bottom: 3.5rem;
  text-align: center;
  background: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.1) 0%, rgba(248, 250, 252, 0) 70%), linear-gradient(180deg, #eef2ff 0%, #f8fafc 100%);
  border-bottom: 1px solid var(--border-color);
}

.page-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.85rem;
}

.page-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
}

.content-block {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.75rem;
  margin-top: -2rem;
  margin-bottom: 5rem;
  box-shadow: var(--shadow-lg);
}

.content-block h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2rem;
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.content-block h2:first-child {
  margin-top: 0;
}

.content-block p {
  color: var(--text-muted);
  font-size: 0.975rem;
  line-height: 1.75;
  margin-bottom: 1.2rem;
}

.content-block ul {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.content-block li {
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 0.4rem;
  list-style-type: disc;
}

.notice-box {
  background: rgba(79, 70, 229, 0.05);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 1.2rem 1.5rem;
  margin: 1.5rem 0;
  color: var(--text-main);
}

.notice-box.warning {
  background: rgba(239, 68, 68, 0.06);
  border-left-color: #ef4444;
}

/* 15. 响应式布局 Media Queries */
@media (max-width: 1200px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 992px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .hero-left {
    text-align: center;
  }
  .hero-cta {
    justify-content: center;
  }
  .hero-features-bar {
    max-width: 600px;
    margin: 0 auto;
  }
  .features-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .features-grid, .unlock-grid, .pricing-grid, .articles-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-nav {
    flex-direction: column;
    gap: 1.1rem;
  }
}