/* roulang page: index */
:root {
      --primary: #1A3C6D;
      --primary-hover: #152E54;
      --secondary: #2E6B9E;
      --accent: #C49A2B;
      --accent-hover: #A88220;
      --bg-page: #FAFBFD;
      --bg-card: #FFFFFF;
      --bg-light: #F7F9FC;
      --text-main: #1A1F2B;
      --text-secondary: #5A6272;
      --text-muted: #8E96A3;
      --border: #E5E9F0;
      --shadow-sm: 0 2px 12px rgba(26, 60, 109, 0.06);
      --shadow-md: 0 8px 24px rgba(26, 60, 109, 0.10);
      --shadow-accent: 0 6px 20px rgba(196, 154, 43, 0.3);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-lg: 16px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --transition: 0.25s ease-in-out;
      --container-max: 1200px;
    }

    * {
      box-sizing: border-box;
    }

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

    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 600;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 36px;
      line-height: 1.22;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 28px;
      line-height: 1.28;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 20px;
      line-height: 1.4;
      font-weight: 600;
    }

    p {
      color: var(--text-secondary);
      font-size: 16px;
      line-height: 1.625;
      max-width: 680px;
    }

    .text-muted {
      color: var(--text-muted) !important;
    }

    .section-padding {
      padding: 80px 0;
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 28px;
      }
      h2 {
        font-size: 22px;
      }
      .section-padding {
        padding: 56px 0;
      }
    }

    /* 容器 */
    .container-custom {
      max-width: var(--container-max);
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      letter-spacing: 0.5px;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(26, 60, 109, 0.12);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary-custom:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(26, 60, 109, 0.2);
      color: white;
    }
    .btn-accent {
      background-color: var(--accent);
      border: none;
      color: white;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      letter-spacing: 0.5px;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(196, 154, 43, 0.2);
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-3px);
      box-shadow: var(--shadow-accent);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      font-size: 16px;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: rgba(26, 60, 109, 0.08);
      transform: translateY(-2px);
      color: var(--primary);
    }
    .btn-lg-accent {
      padding: 16px 40px;
      font-size: 18px;
      border-radius: var(--radius-btn);
    }

    /* 导航栏 - 卡片化面板 */
    .navbar-custom {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 32px);
      max-width: var(--container-max);
      background: var(--bg-card);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      box-shadow: 0 4px 20px rgba(26, 60, 109, 0.08);
      padding: 12px 24px;
      z-index: 1050;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition);
    }
    .navbar-brand-custom {
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      text-decoration: none;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
    }
    .navbar-brand-custom i {
      font-size: 24px;
      margin-right: 8px;
      color: var(--secondary);
    }
    .nav-panel {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-item-card {
      background: #F2F5FA;
      border-radius: 8px;
      padding: 8px 16px;
      font-weight: 500;
      font-size: 14px;
      color: var(--text-secondary);
      transition: var(--transition);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }
    .nav-item-card i {
      font-size: 14px;
      color: var(--secondary);
    }
    .nav-item-card:hover {
      background: rgba(26, 60, 109, 0.1);
      color: var(--primary);
    }
    .navbar-toggler-custom {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      color: var(--primary);
    }
    @media (max-width: 992px) {
      .nav-panel {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: var(--bg-card);
        border-radius: var(--radius-card);
        box-shadow: var(--shadow-md);
        flex-direction: column;
        padding: 24px;
        gap: 12px;
      }
      .nav-panel.active {
        display: flex;
      }
      .navbar-toggler-custom {
        display: block;
      }
      .nav-item-card {
        width: 100%;
        justify-content: center;
        font-size: 16px;
        padding: 12px;
      }
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #FAFBFD 0%, #F0F4FA 100%);
      padding: 160px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero-decor {
      position: absolute;
      right: -80px;
      bottom: -60px;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(26,60,109,0.04) 0%, transparent 70%);
      border-radius: 50%;
    }
    .hero-img-container {
      background: #E5E9F0;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      height: 360px;
    }
    .hero-img-container img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 卡片系统 */
    .card-custom {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 28px;
      transition: var(--transition);
      border: 1px solid transparent;
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: #E5E9F0;
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(46, 107, 158, 0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--secondary);
      font-size: 22px;
      margin-bottom: 20px;
    }
    .service-img {
      height: 180px;
      border-radius: 12px 12px 0 0;
      background: #E5E9F0;
      overflow: hidden;
    }
    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 流程步骤 */
    .step-line {
      width: 40px;
      height: 2px;
      background: var(--border);
      margin: 0 8px;
      align-self: center;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 12px;
    }

    /* 数据卡 */
    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }

    /* 证言 */
    .testimonial-card {
      background: #F7F9FC;
      border-radius: var(--radius-card);
      padding: 28px;
      font-style: italic;
    }

    /* FAQ 手风琴重塑 */
    .accordion-button {
      font-weight: 600;
      font-size: 16px;
      color: var(--text-main);
      background: transparent;
      box-shadow: none;
      border-bottom: 1px solid var(--border);
      padding: 18px 0;
    }
    .accordion-button:not(.collapsed) {
      color: var(--primary);
      background: transparent;
      box-shadow: none;
    }
    .accordion-button::after {
      display: none;
    }
    .accordion-button i {
      transition: var(--transition);
      color: var(--secondary);
      margin-right: 12px;
    }
    .accordion-button:not(.collapsed) i {
      transform: rotate(45deg);
      color: var(--primary);
    }
    .accordion-body {
      padding: 16px 0 16px 40px;
      background: #FAFBFD;
      color: var(--text-secondary);
    }

    /* CTA 区块 */
    .cta-full {
      background: linear-gradient(180deg, #F0F4FA 0%, #E8EDF5 100%);
      border-radius: var(--radius-lg);
      padding: 64px 24px;
    }

    /* 页脚 */
    .footer-custom {
      background: var(--primary);
      color: rgba(255,255,255,0.8);
      padding: 48px 0 0;
    }
    .footer-custom a {
      color: rgba(255,255,255,0.9);
      text-decoration: none;
    }
    .footer-custom a:hover {
      color: var(--accent);
    }
    .copyright-bar {
      background: #15273F;
      font-size: 13px;
      padding: 16px 0;
      color: rgba(255,255,255,0.7);
      margin-top: 32px;
    }

    @media (max-width: 576px) {
      .btn-primary-custom, .btn-accent, .btn-outline-custom {
        width: 100%;
        justify-content: center;
      }
      .hero-img-container {
        height: 240px;
        margin-top: 24px;
      }
    }