/* roulang page: index */
:root {
      --primary-steel: #2C4A52;
      --accent-copper: #C47E5A;
      --accent-copper-hover: #B06A45;
      --bg-warm-white: #F7F4F0;
      --bg-deep: #1E2F33;
      --text-dark: #1E2F33;
      --text-muted: #5A6C6F;
      --border-soft: #E5DDD5;
      --card-shadow: 0 4px 12px rgba(44, 74, 82, 0.08);
      --card-shadow-hover: 0 8px 20px rgba(44, 74, 82, 0.15);
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --transition: 0.25s ease;
      --section-gap: 80px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', sans-serif;
      background-color: var(--bg-warm-white);
      color: var(--text-dark);
      font-weight: 400;
      line-height: 1.8;
      font-size: 16px;
      margin: 0;
      padding-top: 64px;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: 0.02em;
      color: var(--primary-steel);
    }

    a {
      color: var(--accent-copper);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--accent-copper-hover);
    }

    .container {
      max-width: 1140px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .navbar {
      background: rgba(247, 244, 240, 0.95);
      backdrop-filter: blur(8px);
      height: 64px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      border-bottom: 1px solid var(--border-soft);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.03em;
      color: var(--primary-steel) !important;
      display: flex;
      align-items: center;
    }
    .navbar-brand i {
      font-size: 1.8rem;
      margin-right: 8px;
      color: var(--accent-copper);
    }
    .nav-link {
      color: var(--text-dark) !important;
      font-weight: 500;
      margin: 0 6px;
      transition: var(--transition);
      border-bottom: 2px solid transparent;
      padding: 0.4rem 0.8rem !important;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-copper) !important;
      border-bottom-color: var(--accent-copper);
    }
    .btn-primary-cta {
      background: var(--accent-copper);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      letter-spacing: 0.03em;
      white-space: nowrap;
    }
    .btn-primary-cta:hover {
      background: var(--accent-copper-hover);
      color: white;
      transform: translateY(-1px);
    }
    .btn-outline-steel {
      border: 1px solid var(--primary-steel);
      background: transparent;
      color: var(--primary-steel);
      font-weight: 600;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }
    .btn-outline-steel:hover {
      background: var(--primary-steel);
      color: white;
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, rgba(44,74,82,0.75) 0%, rgba(30,47,51,0.8) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      color: white;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
      line-height: 1.3;
    }
    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      margin: 1.5rem 0 2rem;
    }

    /* 通用区块 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-size: 2.2rem;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 3px;
      background: var(--accent-copper);
    }
    .bg-deep {
      background-color: var(--bg-deep);
      color: white;
    }
    .bg-deep .section-title {
      color: white;
    }
    .bg-deep .section-title::after {
      background: var(--accent-copper);
    }

    /* 卡片 */
    .card-custom {
      background: white;
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-2px);
    }
    .card-body {
      padding: 1.8rem;
    }

    /* 流程步骤 */
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--primary-steel);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.4rem;
      margin: 0 auto 12px;
    }
    .step-line {
      border-left: 2px dashed var(--accent-copper);
      height: 40px;
      margin: 0 auto;
    }

    /* FAQ 手风琴 */
    .accordion-button {
      font-weight: 600;
      color: var(--primary-steel);
      background: white;
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-md) !important;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background: var(--bg-warm-white);
      color: var(--primary-steel);
      box-shadow: none;
      border-color: var(--border-soft);
    }
    .accordion-item {
      border: none;
      margin-bottom: 12px;
    }

    /* 表单 */
    .form-control {
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-sm);
      background: white;
      padding: 0.7rem 1rem;
    }
    .form-control:focus {
      border-color: var(--accent-copper);
      box-shadow: 0 0 0 0.2rem rgba(196,126,90,0.2);
    }

    footer {
      background: var(--bg-deep);
      color: rgba(255,255,255,0.8);
      padding: 3rem 0 1.5rem;
      font-size: 0.95rem;
    }
    footer a {
      color: rgba(255,255,255,0.7);
    }
    footer a:hover {
      color: var(--accent-copper);
    }
    .footer-brand {
      font-weight: 700;
      font-size: 1.4rem;
      color: white;
    }

    @media (max-width: 992px) {
      .navbar-nav {
        background: rgba(247,244,240,0.98);
        padding: 1rem;
        border-radius: 0 0 var(--radius-md) var(--radius-md);
      }
      #hero h1 {
        font-size: 2.4rem;
      }
      .section-title {
        font-size: 1.9rem;
      }
    }
    @media (max-width: 768px) {
      :root {
        --section-gap: 48px;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
    }