/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-hover: #154f66;
      --secondary: #0E8C5A;
      --secondary-hover: #0b7048;
      --accent: #F59E0B;
      --bg-page: #F7F9FC;
      --bg-white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --border-light: #E2E8F0;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-chip: 30px;
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      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-top: 70px;
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 600;
      letter-spacing: -0.02em;
    }
    a {
      text-decoration: none;
      color: var(--primary);
      transition: var(--transition);
    }
    a:hover {
      color: var(--secondary);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1140px;
      margin: 0 auto;
      padding-left: 15px;
      padding-right: 15px;
    }
    /* 导航栏 */
    .navbar-william {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 1030;
      height: 70px;
      display: flex;
      align-items: center;
    }
    .nav-logo {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }
    .nav-logo i {
      font-size: 2rem;
      color: var(--secondary);
    }
    .nav-chips {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .chip-link {
      background: transparent;
      color: var(--text-muted);
      padding: 8px 20px;
      border-radius: var(--radius-chip);
      font-weight: 500;
      transition: var(--transition);
      display: inline-block;
      font-size: 0.95rem;
    }
    .chip-link:hover {
      background: rgba(26,95,122,0.08);
      color: var(--primary);
    }
    .chip-link.active {
      background: var(--primary);
      color: white;
    }
    .btn-primary-william {
      background: var(--primary);
      border: none;
      color: white;
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      white-space: nowrap;
    }
    .btn-primary-william:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(26,95,122,0.25);
      color: white;
    }
    .btn-outline-william {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-william:hover {
      background: rgba(26,95,122,0.08);
      color: var(--primary);
    }
    .navbar-toggler-william {
      border: none;
      color: var(--primary);
      font-size: 1.6rem;
      padding: 6px;
    }
    .mobile-menu {
      background: white;
      border-radius: 16px;
      box-shadow: var(--shadow-hover);
      padding: 20px;
      margin-top: 10px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #ffffff 0%, #F0F4F8 100%);
      min-height: 75vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-img {
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      mask-image: linear-gradient(to left, rgba(0,0,0,0.4), transparent);
      -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.4), transparent);
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-main);
    }
    .hero-title span {
      color: var(--secondary);
      font-weight: 800;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 550px;
    }
    /* 板块通用 */
    .section-padding {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1.5rem;
      color: var(--text-main);
    }
    .card-william {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 28px;
      transition: var(--transition);
      border: none;
      height: 100%;
    }
    .card-william:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-circle {
      width: 50px;
      height: 50px;
      background: rgba(14,140,90,0.12);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--secondary);
      font-size: 1.8rem;
      margin-bottom: 20px;
    }
    .data-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }
    .testimonial-card {
      border-left: 4px solid var(--primary);
      background: var(--bg-white);
      border-radius: 12px;
      padding: 24px;
      box-shadow: var(--shadow-card);
    }
    .accordion-button-william {
      background: transparent;
      border: none;
      border-bottom: 1px solid var(--border-light);
      font-weight: 600;
      padding: 18px 20px;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      width: 100%;
      text-align: left;
    }
    .accordion-button-william:not(.collapsed) {
      color: var(--primary);
      background: transparent;
    }
    .cta-dark {
      background: linear-gradient(135deg, #1A5F7A 0%, #154f66 100%);
      border-radius: 32px;
      padding: 60px 30px;
      color: white;
    }
    .footer-william {
      background: #1E293B;
      color: #CBD5E1;
      padding: 50px 0 20px;
    }
    .footer-william a {
      color: #94A3B8;
    }
    .footer-william a:hover {
      color: white;
    }
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.8rem;
      }
      .hero-bg-img {
        width: 100%;
        opacity: 0.15;
      }
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }
    @media (max-width: 576px) {
      .hero-title {
        font-size: 1.9rem;
      }
      .section-title {
        font-size: 1.8rem;
      }
    }