/* roulang page: index */
:root {
      --db-deep-blue: #0B1A2E;
      --db-champagne: #C8A96E;
      --db-pure-white: #FFFFFF;
      --db-ice-gray: #F5F7FA;
      --db-charcoal: #1E1E1E;
      --db-rock-gray: #5C6B7A;
      --db-border-light: #E5E9F0;
      --db-shadow-sm: 0 4px 20px rgba(11, 26, 46, 0.06);
      --db-shadow-hover: 0 12px 32px rgba(11, 26, 46, 0.12);
      --db-radius-card: 12px;
      --db-radius-btn: 8px;
      --db-font-sans: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --transition-base: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--db-font-sans);
      background-color: var(--db-pure-white);
      color: var(--db-charcoal);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      color: var(--db-deep-blue);
    }

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

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

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

    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--db-deep-blue);
      color: var(--db-champagne);
      border: none;
      padding: 12px 28px;
      border-radius: var(--db-radius-btn);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      transition: var(--transition-base);
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 10px rgba(11, 26, 46, 0.1);
      border: 1px solid transparent;
    }

    .btn-primary-custom:hover {
      background-color: #152B44;
      color: #f0e0b0;
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(11, 26, 46, 0.25);
    }

    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--db-deep-blue);
      color: var(--db-deep-blue);
      padding: 12px 28px;
      border-radius: var(--db-radius-btn);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      transition: var(--transition-base);
      display: inline-block;
      text-align: center;
    }

    .btn-outline-custom:hover {
      background-color: rgba(11, 26, 46, 0.05);
      border-color: var(--db-deep-blue);
      color: var(--db-deep-blue);
    }

    /* 导航 */
    .navbar-custom {
      background: var(--db-pure-white);
      border-bottom: 1px solid var(--db-border-light);
      padding: 0.8rem 0;
      transition: box-shadow 0.3s ease;
    }

    .navbar-custom.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }

    .logo-text {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--db-deep-blue);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
    }
    .logo-text i { color: var(--db-champagne); margin-right: 6px; }

    .nav-link-custom {
      color: var(--db-rock-gray);
      font-weight: 500;
      font-size: 15px;
      margin: 0 0.6rem;
      position: relative;
      padding: 0.5rem 0;
    }
    .nav-link-custom:hover {
      color: var(--db-champagne);
    }
    .nav-link-custom::after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      bottom: 0;
      left: 0;
      background: var(--db-champagne);
      transition: 0.3s;
    }
    .nav-link-custom:hover::after { width: 100%; }

    .hot-badge {
      background: #d32f2f;
      color: white;
      border-radius: 50%;
      width: 10px;
      height: 10px;
      display: inline-block;
      margin-left: 4px;
      position: relative;
      top: -2px;
    }
    .hot-tag {
      font-size: 0.7rem;
      color: #d32f2f;
      font-weight: 700;
      margin-left: 2px;
    }

    /* Hero */
    .hero-section {
      padding: 6rem 0 5rem;
      background: var(--db-pure-white);
    }
    .hero-title {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--db-deep-blue);
    }
    .hero-sub {
      color: var(--db-rock-gray);
      font-size: 1.2rem;
      margin: 1.2rem 0 1.8rem;
    }
    .trust-signals i { color: var(--db-champagne); margin-right: 6px; }
    .hero-image-mask {
      border-radius: 16px;
      overflow: hidden;
      position: relative;
      box-shadow: var(--db-shadow-sm);
    }
    .hero-image-mask img {
      object-fit: cover;
      width: 100%;
      height: 100%;
      min-height: 350px;
    }
    .gradient-overlay {
      position: absolute;
      top:0; left:0; right:0; bottom:0;
      background: linear-gradient(135deg, rgba(11,26,46,0.65) 0%, rgba(11,26,46,0.1) 100%);
    }

    /* 板块标题 */
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--db-deep-blue);
      position: relative;
      padding-left: 18px;
    }
    .section-title::before {
      content: '';
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 4px;
      height: 28px;
      background: var(--db-champagne);
      border-radius: 2px;
    }
    .section-sub {
      color: var(--db-rock-gray);
    }

    .feature-card {
      background: var(--db-pure-white);
      padding: 28px;
      border-radius: var(--db-radius-card);
      box-shadow: var(--db-shadow-sm);
      transition: var(--transition-base);
      border: none;
    }
    .feature-card:hover {
      box-shadow: var(--db-shadow-hover);
      transform: translateY(-2px);
    }
    .feature-icon {
      font-size: 40px;
      color: var(--db-champagne);
      margin-bottom: 16px;
    }

    .service-card {
      background: white;
      border-radius: var(--db-radius-card);
      box-shadow: var(--db-shadow-sm);
      overflow: hidden;
      transition: var(--transition-base);
    }
    .service-card:hover {
      box-shadow: var(--db-shadow-hover);
      transform: translateY(-4px);
    }
    .service-img {
      height: 180px;
      object-fit: cover;
    }

    .case-card {
      background: white;
      border-radius: var(--db-radius-card);
      box-shadow: var(--db-shadow-sm);
      overflow: hidden;
      margin-bottom: 24px;
    }
    .tag-capsule {
      background: var(--db-deep-blue);
      color: var(--db-champagne);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
    }

    .compare-col.recommended {
      background: var(--db-deep-blue);
      color: white;
      transform: scale(1.03);
      border-radius: 16px;
      padding: 28px;
    }
    .compare-col {
      background: #F9FAFC;
      border-radius: 16px;
      padding: 24px;
    }

    .accordion-button-custom {
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--db-charcoal);
      padding: 20px 0;
      border-bottom: 1px solid var(--db-border-light);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-button-custom i { color: var(--db-champagne); }

    footer {
      background: var(--db-deep-blue);
      color: rgba(255,255,255,0.8);
    }
    .footer-link {
      color: rgba(255,255,255,0.7);
    }
    .footer-link:hover { color: var(--db-champagne); }

    @media (max-width: 768px) {
      .hero-title { font-size: 32px; }
      .section-title { font-size: 26px; }
    }