/* roulang page: index */
:root {
      --primary: #1A5FDC;
      --primary-deep: #0F3D8C;
      --accent: #FF6B35;
      --accent-hover: #E55A2B;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text: #1E293B;
      --text-secondary: #64748B;
      --border: #E2E8F0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(26,95,220,0.12);
      --radius: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --max-width: 1200px;
      --nav-height: 72px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      font-size: 16px;
      border: none;
      border-radius: var(--radius-btn);
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    
    button:focus-visible, .btn:focus-visible, a:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }
    
    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.3;
    }
    
    h1 {
      font-size: 44px;
      font-weight: 700;
      color: var(--primary-deep);
      line-height: 1.2;
    }
    
    h2 {
      font-size: 32px;
      color: var(--text);
    }
    
    h3 {
      font-size: 20px;
      color: var(--text);
    }
    
    h4 {
      font-size: 18px;
      font-weight: 500;
      color: var(--primary-deep);
    }
    
    .text-secondary {
      color: var(--text-secondary);
      font-size: 14px;
    }
    
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: #FFFFFF;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--primary-deep);
    }
    
    .logo i {
      font-size: 28px;
      color: var(--accent);
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .nav-item {
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      transition: all 0.2s;
    }
    
    .nav-item:hover,
    .nav-item.active {
      background: #F1F5F9;
      color: var(--primary);
    }
    
    .nav-item.active {
      background: var(--primary);
      color: white;
    }
    
    .btn-nav {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 15px;
    }
    
    .btn-nav:hover {
      background: var(--accent-hover);
    }
    
    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--text);
      cursor: pointer;
    }
    
    /* 移动端导航面板 */
    .mobile-panel {
      display: none;
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      flex-direction: column;
      padding: 16px 0;
      z-index: 999;
    }
    
    .mobile-panel .nav-item {
      display: block;
      padding: 14px 24px;
      border-radius: 0;
      font-size: 18px;
    }
    
    /* 通用板块间距 */
    section {
      padding: 100px 0;
    }
    
    /* 按钮样式 */
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    
    .text-link {
      color: var(--primary);
      font-weight: 500;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .text-link:hover {
      text-decoration: underline;
    }
    
    /* Hero */
    .hero {
      padding-top: calc(var(--nav-height) + 60px);
      padding-bottom: 80px;
      background: linear-gradient(135deg, #F8FAFC 0%, #E2E8F0 100%);
    }
    
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    
    .hero-left {
      flex: 0 0 55%;
    }
    
    .hero-left h1 {
      margin-bottom: 16px;
    }
    
    .hero-left p {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .hero-right {
      flex: 0 0 45%;
      position: relative;
    }
    
    .hero-right img {
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
      width: 100%;
      object-fit: cover;
    }
    
    .play-badge {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      background: rgba(255,255,255,0.9);
      width: 64px;
      height: 64px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 28px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }
    
    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .feature-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    .feature-icon {
      width: 64px;
      height: 64px;
      background: #EFF6FF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 28px;
      color: var(--primary);
    }
    
    .feature-card h3 {
      margin-bottom: 8px;
    }
    
    /* 瀑布流 */
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    
    .masonry-card {
      break-inside: avoid;
      background: var(--card-bg);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      overflow: hidden;
      transition: var(--transition);
    }
    
    .masonry-card:hover {
      box-shadow: var(--shadow-hover);
    }
    
    .masonry-card img {
      width: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    
    .masonry-card:hover img {
      transform: scale(1.03);
    }
    
    .masonry-content {
      padding: 20px;
    }
    
    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    
    .compare-card {
      background: white;
      border-radius: var(--radius);
      padding: 40px 32px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    
    .compare-card.recommended {
      border: 2px solid var(--primary);
    }
    
    .badge {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--accent);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
    }
    
    .price {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-deep);
      margin: 16px 0;
    }
    
    .feature-list {
      list-style: none;
      margin: 24px 0;
    }
    
    .feature-list li {
      padding: 8px 0;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text);
    }
    
    .feature-list i {
      color: #10B981;
    }
    
    /* 横向滚动案例 */
    .scroll-x {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: none;
      -ms-overflow-style: none;
    }
    
    .scroll-x::-webkit-scrollbar {
      display: none;
    }
    
    .case-card {
      min-width: 280px;
      background: white;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      flex-shrink: 0;
    }
    
    .case-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    
    .case-info {
      padding: 16px;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 16px 0;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 500;
      font-size: 18px;
      color: var(--primary-deep);
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F8FAFC;
      padding: 0 16px;
      margin-top: 8px;
      border-radius: 8px;
    }
    
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    
    /* CTA 横幅 */
    .cta-band {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
      color: white;
      text-align: center;
      padding: 80px 24px;
    }
    
    .cta-band h2 {
      color: white;
    }
    
    .btn-white {
      background: white;
      color: var(--primary);
      padding: 16px 40px;
      font-weight: 700;
    }
    
    .btn-white:hover {
      background: var(--accent);
      color: white;
    }
    
    /* 页脚 */
    .footer {
      background: #1E293B;
      color: #CBD5E1;
      padding: 60px 0 0;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    
    .footer-col i {
      margin-right: 8px;
    }
    
    .footer a {
      color: #CBD5E1;
      display: block;
      margin-bottom: 8px;
    }
    
    .footer a:hover {
      color: var(--accent);
    }
    
    .copyright {
      background: #0F172A;
      color: #94A3B8;
      text-align: center;
      padding: 20px 0;
      margin-top: 40px;
      font-size: 14px;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .masonry { columns: 2; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 24px; }
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .hero-grid { flex-direction: column; }
      .hero-left, .hero-right { flex: 1 1 auto; }
      .features-grid { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
      .compare-grid { grid-template-columns: 1fr; }
      .scroll-x { gap: 16px; }
      .case-card { min-width: 85vw; }
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 60px 0; }
    }
    
    @media (max-width: 480px) {
      h1 { font-size: 28px; }
      h2 { font-size: 22px; }
      .btn { padding: 12px 24px; width: 100%; }
      .hero-buttons { flex-direction: column; }
    }