/* roulang page: index */
:root {
      --primary: #E85D04;
      --primary-dark: #D14B00;
      --accent: #F9A826;
      --bg-deep: #1A1A2E;
      --bg-card: rgba(45,45,68,0.6);
      --bg-light: #F4F4F6;
      --text-light: #E0E0E0;
      --text-dark: #333;
      --text-muted: #999;
      --border-subtle: #2D2D44;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.25);
      --shadow-glow: 0 8px 30px rgba(232,93,4,0.3);
      --font-en: 'Inter', 'Roboto', sans-serif;
      --font-cn: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --container-max: 1280px;
      --space-section: 120px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-cn);
      background-color: var(--bg-deep);
      color: var(--text-light);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    h1, h2, h3 {
      font-family: var(--font-cn);
      letter-spacing: 0.5px;
    }

    h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: #fff;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--primary);
    }

    a {
      color: var(--text-light);
      text-decoration: none;
      transition: color 0.3s;
    }

    a:hover {
      color: var(--primary);
    }

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

    button, .btn {
      font-family: var(--font-cn);
      cursor: pointer;
      border: none;
      outline: none;
      transition: all 0.3s ease;
    }

    .btn:focus-visible, a:focus-visible, button:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26,26,46,0.85);
      backdrop-filter: blur(15px);
      border-bottom: 1px solid rgba(232,93,4,0.3);
      transition: background 0.25s, padding 0.25s;
    }

    .navbar.scrolled {
      background: rgba(26,26,46,1);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      height: 72px;
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      white-space: nowrap;
      text-decoration: none;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 16px;
      color: #ddd;
      text-decoration: none;
    }

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

    .btn-primary {
      background: var(--primary);
      color: #fff;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 4px 12px rgba(232,93,4,0.4);
      border: none;
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(232,93,4,0.6);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 16px;
    }

    .btn-outline:hover {
      background: rgba(232,93,4,0.15);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 28px;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(26,26,46,0.95);
      backdrop-filter: blur(20px);
      box-shadow: 0 -5px 20px rgba(0,0,0,0.6);
      z-index: 999;
      justify-content: space-around;
      padding: 8px 0;
    }

    /* Hero */
    .hero {
      padding: 180px 0 100px;
      background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(232,93,4,0.08) 0%, transparent 60%);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
    }

    .hero-text {
      flex: 1 1 55%;
    }

    .hero-text h1 {
      margin-bottom: 24px;
      font-size: 52px;
    }

    .hero-sub {
      font-size: 18px;
      color: #ccc;
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-image {
      flex: 1 1 45%;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 0 30px rgba(232,93,4,0.25);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      border-radius: 16px;
    }

    /* 通用板块 */
    .section {
      padding: var(--space-section) 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 48px;
    }

    .highlight-item {
      text-align: center;
      padding: 24px;
    }

    .highlight-icon {
      font-size: 48px;
      color: var(--accent);
      margin-bottom: 16px;
    }

    /* 服务不对称网格 */
    .services-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

    .service-card {
      background: var(--bg-card);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-glow);
    }

    .service-img {
      height: 220px;
      background-size: cover;
      background-position: center;
    }

    .service-content {
      padding: 24px;
    }

    .tag {
      background: var(--primary);
      color: #fff;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: var(--bg-card);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: 0.3s;
    }

    .case-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-glow);
    }

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .case-body {
      padding: 24px;
    }

    .stat-num {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent);
    }

    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .compare-col {
      padding: 40px;
    }

    .compare-left {
      background: #f0f0f5;
      color: #333;
    }

    .compare-right {
      background: #1e1e32;
      border-left: 4px solid var(--primary);
      box-shadow: 0 0 30px rgba(232,93,4,0.4);
    }

    .compare-list {
      list-style: none;
    }

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-list details {
      border-bottom: 1px solid var(--border-subtle);
      padding: 16px 0;
    }

    .faq-list summary {
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-list .answer {
      padding: 16px 0 0;
      color: #ccc;
    }

    /* CTA */
    .cta-section {
      background: #0f0f23;
      text-align: center;
      padding: 100px 0;
    }

    .btn-large {
      font-size: 20px;
      padding: 16px 48px;
      background: var(--primary);
      border-radius: 40px;
      font-weight: 700;
    }

    /* 页脚 */
    .footer {
      background: #111122;
      padding: 60px 0 30px;
      color: #999;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .copyright {
      text-align: center;
      margin-top: 40px;
      font-size: 12px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .container { padding: 0 20px; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .mobile-bottom-nav { display: flex; }
      .hero-grid { flex-direction: column; }
      h1 { font-size: 36px; }
      .highlights-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .navbar { height: 64px; }
    }