/* roulang page: index */
:root {
      --primary-black: #1A1A1A;
      --accent-orange: #FF4F00;
      --accent-orange-deep: #E04500;
      --gray-track: #6C6C6C;
      --surface-white: #FFFFFF;
      --surface-light: #F8F8F8;
      --text-body: #4A4A4A;
      --text-muted: #9B9B9B;
      --border-light: #E0E0E0;
      --card-radius: 8px;
      --btn-radius: 6px;
      --section-gap: 120px;
      --container-max: 1200px;
      --transition-base: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "DIN Alternate", "Bebas Neue", "PingFang SC", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--surface-white);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .button {
      cursor: pointer;
      font-family: var(--font-sans);
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 排版辅助 */
    .section {
      padding: var(--section-gap) 0;
    }

    .section-header {
      margin-bottom: 64px;
    }

    .section-title {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: 0;
      color: var(--primary-black);
      line-height: 1.2;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 40px;
      height: 4px;
      background-color: var(--accent-orange);
    }

    .section-sub {
      font-size: 18px;
      color: var(--gray-track);
      max-width: 680px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      transition: background var(--transition-base), box-shadow var(--transition-base);
    }

    .header-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary-black);
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--accent-orange);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .search-icon {
      font-size: 18px;
      color: var(--primary-black);
      cursor: pointer;
    }

    .btn-outline-sm {
      border: 1px solid var(--accent-orange);
      color: var(--accent-orange);
      background: transparent;
      padding: 8px 18px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 14px;
      transition: all var(--transition-base);
    }

    .btn-outline-sm:hover {
      background: var(--accent-orange);
      color: #fff;
    }

    .nav-tabs {
      display: flex;
      gap: 8px;
      padding: 12px 0;
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: none;
      -ms-overflow-style: none;
    }
    .nav-tabs::-webkit-scrollbar {
      display: none;
    }

    .pill-link {
      background: #F0F0F0;
      color: var(--primary-black);
      padding: 8px 18px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 15px;
      transition: all var(--transition-base);
      display: inline-block;
    }

    .pill-link:hover,
    .pill-link.active {
      background: var(--accent-orange);
      color: #fff;
    }

    /* 移动端汉堡 */
    .mobile-toggle {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--primary-black);
    }

    @media (max-width: 768px) {
      .header-top {
        flex-wrap: wrap;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-tabs {
        display: none;
        flex-wrap: nowrap;
      }
      .nav-tabs.open {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(90deg, rgba(26,26,26,0.75) 0%, rgba(26,26,26,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 90px;
    }

    .hero-content {
      max-width: 700px;
    }

    .hero h1 {
      font-size: 72px;
      font-weight: 900;
      letter-spacing: -1px;
      line-height: 1.1;
      margin-bottom: 24px;
      animation: fadeUp 0.8s ease;
    }

    .hero-sub {
      font-size: 20px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 40px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 14px 36px;
      border-radius: var(--btn-radius);
      font-weight: 700;
      font-size: 16px;
      border: none;
      transition: background var(--transition-base);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-primary:hover {
      background: var(--accent-orange-deep);
      color: white;
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      transition: all var(--transition-base);
    }

    .btn-ghost:hover {
      background: white;
      color: var(--primary-black);
    }

    @keyframes fadeUp {
      0% { opacity: 0; transform: translateY(30px); }
      100% { opacity: 1; transform: translateY(0); }
    }

    /* 指标看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: -60px;
      position: relative;
      z-index: 2;
    }

    .stat-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--card-radius);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      border-bottom: 4px solid var(--accent-orange);
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 52px;
      font-weight: 800;
      color: var(--primary-black);
      line-height: 1.2;
    }

    .stat-label {
      color: var(--gray-track);
      font-weight: 600;
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .service-card {
      background: white;
      padding: 40px 32px;
      border-radius: var(--card-radius);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      transition: all var(--transition-base);
      border: 1px solid transparent;
    }

    .service-card:hover {
      box-shadow: 0 8px 30px rgba(0,0,0,0.08);
      transform: translateY(-4px);
      border-color: var(--accent-orange);
    }

    .service-icon {
      font-size: 40px;
      color: var(--accent-orange);
      margin-bottom: 24px;
    }

    .service-card h3 {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--primary-black);
    }

    .service-link {
      margin-top: 20px;
      font-weight: 600;
      color: var(--accent-orange);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap var(--transition-base);
    }

    .service-link:hover {
      gap: 12px;
    }

    /* 对比区 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 80px 1fr;
      align-items: center;
      gap: 24px;
    }

    .compare-col {
      background: var(--surface-light);
      padding: 40px;
      border-radius: var(--card-radius);
    }

    .compare-col.highlight {
      background: white;
      border: 2px solid var(--accent-orange);
      box-shadow: 0 8px 28px rgba(0,0,0,0.04);
    }

    .vs-badge {
      background: var(--accent-orange);
      color: white;
      width: 60px;
      height: 60px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 20px;
    }

    .compare-title {
      font-weight: 700;
      font-size: 22px;
      margin-bottom: 20px;
    }

    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 700;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--primary-black);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-body);
      padding-top: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    /* 表单 */
    .cta-section {
      background: var(--surface-light);
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .form-left h2 {
      font-size: 42px;
      font-weight: 700;
    }

    .trust-list {
      list-style: none;
      margin-top: 24px;
    }
    .trust-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .form-card {
      background: white;
      padding: 40px;
      border-radius: var(--card-radius);
      box-shadow: 0 8px 28px rgba(0,0,0,0.04);
    }

    .form-card input,
    .form-card textarea {
      width: 100%;
      padding: 14px;
      margin-bottom: 20px;
      border: 1px solid var(--border-light);
      border-radius: 6px;
      font-family: inherit;
    }

    .btn-full {
      width: 100%;
      background: var(--accent-orange);
      color: white;
      border: none;
      padding: 16px;
      font-weight: 700;
      border-radius: var(--btn-radius);
      transition: background var(--transition-base);
    }

    .btn-full:hover {
      background: var(--accent-orange-deep);
    }

    /* 页脚 */
    .footer {
      background: var(--primary-black);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    .footer-brand {
      font-size: 24px;
      font-weight: 800;
      color: white;
    }

    .footer a {
      color: var(--text-muted);
    }

    .footer-bottom {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

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

    @media (max-width: 768px) {
      .section { padding: 80px 0; }
      .hero h1 { font-size: 42px; }
      .section-title { font-size: 32px; }
      .services-grid,
      .stats-grid,
      .form-grid,
      .footer-grid,
      .compare-wrapper { grid-template-columns: 1fr; }
      .vs-badge { margin: 20px auto; }
    }