/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-hover: #154E66;
      --secondary: #2E8B9E;
      --secondary-light: rgba(46, 139, 158, 0.12);
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-heading: #1E293B;
      --text-body: #475569;
      --text-muted: #94A3B8;
      --border-light: #E2E8F0;
      --border-subtle: #CBD5E1;
      --shadow-card: 0 2px 12px rgba(26, 95, 122, 0.08);
      --shadow-hover: 0 8px 24px rgba(26, 95, 122, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --radius-dashboard: 16px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --spacing-section: 100px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .h1, .h2, .h3 {
      color: var(--text-heading);
      font-weight: 600;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航 */
    .navbar-custom {
      background: rgba(248, 250, 252, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 transparent;
      transition: box-shadow 0.2s ease, background 0.2s;
      padding: 12px 0;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
    }

    .navbar-scrolled {
      box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
      background: rgba(248, 250, 252, 0.95);
    }

    .nav-logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

    .nav-link-custom {
      color: var(--text-body) !important;
      font-weight: 500;
      padding: 6px 16px !important;
      margin: 0 4px;
      border-radius: 6px;
      transition: 0.2s;
      font-size: 0.95rem;
    }

    .nav-link-custom:hover,
    .nav-link-custom.active {
      color: var(--secondary) !important;
      background: transparent;
    }

    .nav-link-custom.active {
      border-bottom: 2px solid var(--secondary);
      border-radius: 0;
      padding-bottom: 4px;
    }

    .btn-nav-cta {
      border: 1px solid var(--secondary);
      background: transparent;
      color: var(--secondary);
      font-weight: 500;
      padding: 8px 18px;
      border-radius: var(--radius-btn);
      transition: 0.25s;
      font-size: 0.9rem;
    }

    .btn-nav-cta:hover {
      background: var(--secondary);
      color: white;
      border-color: var(--secondary);
    }

    /* Hero */
    .hero-section {
      padding: 140px 0 100px;
      background: var(--bg);
      min-height: 100vh;
      display: flex;
      align-items: center;
    }

    .hero-title {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-heading);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-body);
      margin: 20px 0 30px;
      max-width: 540px;
    }

    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: 0.2s;
      box-shadow: 0 4px 10px rgba(26, 95, 122, 0.3);
    }

    .btn-primary-custom:hover {
      background: var(--primary-hover);
      color: white;
      box-shadow: 0 6px 14px rgba(26, 95, 122, 0.4);
    }

    .btn-outline-custom {
      border: 1px solid var(--primary);
      background: transparent;
      color: var(--primary);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: 0.2s;
    }

    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
    }

    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 340px;
      border-radius: 24px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
      transform: rotate(1deg);
      transition: 0.3s;
      position: relative;
      background-color: #e9f0f5;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--card-bg);
      border-radius: var(--radius-dashboard);
      padding: 32px 16px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
    }

    .metric-card:hover {
      box-shadow: var(--shadow-hover);
    }

    .metric-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.2;
    }

    .metric-label {
      color: var(--text-body);
      font-size: 0.95rem;
      margin-top: 8px;
    }

    /* 服务卡片 2x3 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: 0.25s;
      box-shadow: var(--shadow-card);
    }

    .service-card:hover {
      transform: translateY(-6px);
      border-color: var(--secondary);
      box-shadow: var(--shadow-hover);
    }

    .service-icon {
      width: 64px;
      height: 64px;
      background: var(--secondary-light);
      border-radius: 16px;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .service-icon img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: 16px;
    }

    /* 对比组件 */
    .compare-left, .compare-right {
      padding: 28px;
    }

    .compare-title {
      font-weight: 700;
      font-size: 1.5rem;
      margin-bottom: 20px;
    }

    .compare-list {
      list-style: none;
      padding: 0;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.98rem;
    }

    .icon-remove {
      color: #94a3b8;
      opacity: 0.8;
    }

    .icon-check {
      color: var(--secondary);
      font-weight: 700;
    }

    /* FAQ */
    .accordion-custom .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: transparent;
    }

    .accordion-custom .accordion-button {
      background: transparent;
      font-weight: 500;
      color: var(--text-heading);
      padding: 20px 18px;
      box-shadow: none;
      border: none;
      font-size: 1rem;
    }

    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--primary);
      background: transparent;
      border-left: 4px solid var(--secondary);
      padding-left: 14px;
    }

    .accordion-custom .accordion-body {
      background: #F1F5F9;
      padding: 20px 18px;
      color: var(--text-body);
      font-size: 0.95rem;
    }

    /* CTA 表单 */
    .cta-form input {
      height: 48px;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-input);
      padding: 0 16px;
      width: 100%;
      transition: 0.2s;
    }

    .cta-form input:focus {
      border-color: var(--secondary);
      box-shadow: 0 0 0 3px rgba(46, 139, 158, 0.2);
      outline: none;
    }

    .btn-submit {
      background: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px;
      border-radius: var(--radius-btn);
      transition: 0.2s;
    }

    .btn-submit:hover {
      background: var(--primary-hover);
    }

    footer {
      background: #fff;
      border-top: 1px solid var(--border-light);
      padding: 60px 0 30px;
    }

    .footer-bottom {
      background: #F1F5F9;
      font-size: 0.8rem;
      color: var(--text-muted);
    }

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

    @media (max-width: 768px) {
      .hero-section { padding: 120px 0 70px; text-align: center; }
      .hero-title { font-size: 32px; }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
      .service-grid { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      .navbar-nav { background: rgba(248,250,252,0.96); padding: 16px; border-radius: 16px; }
    }