/* roulang page: index */
:root {
      --bs-primary: #E87A2A;
      --bs-primary-hover: #C96A1E;
      --bs-secondary: #C49A6C;
      --bs-dark: #2E2B28;
      --bs-body-bg: #FBF7F2;
      --bs-body-color: #2E2B28;
      --bs-border-radius: 12px;
      --bs-font-sans-serif: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --bs-font-serif: 'Noto Serif SC', serif;
      --copper-green: #5D8A7F;
      --sand-gold: #C49A6C;
      --warm-white: #FDF8F3;
      --soft-gray: #F5F2ED;
      --border-light: #E8E3DC;
      --text-muted: #5A5552;
      --footer-text: #B5B0AA;
      --card-shadow: 0 4px 20px rgba(46, 43, 40, 0.06);
      --card-shadow-hover: 0 12px 32px rgba(46, 43, 40, 0.10);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--bs-font-sans-serif);
      background-color: var(--bs-body-bg);
      color: var(--bs-body-color);
      line-height: 1.8;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .serif-title {
      font-family: var(--bs-font-serif);
      font-weight: 700;
      letter-spacing: 0.02em;
    }

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

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

    .container {
      max-width: 1140px;
      width: 100%;
      margin-left: auto;
      margin-right: auto;
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--bs-primary);
      border: 1px solid var(--bs-primary);
      color: white;
      font-weight: 600;
      border-radius: 12px;
      padding: 12px 28px;
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.2s, box-shadow 0.2s;
      box-shadow: 0 2px 6px rgba(232, 122, 42, 0.15);
    }
    .btn-primary-custom:hover {
      background-color: var(--bs-primary-hover);
      border-color: var(--bs-primary-hover);
      color: white;
      box-shadow: 0 4px 12px rgba(201, 106, 30, 0.25);
    }

    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--bs-primary);
      color: var(--bs-primary);
      font-weight: 600;
      border-radius: 12px;
      padding: 12px 28px;
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s;
    }
    .btn-outline-custom:hover {
      background-color: rgba(232, 122, 42, 0.08);
      border-color: var(--bs-primary);
      color: var(--bs-primary);
    }

    .btn-dark-custom {
      background-color: var(--bs-dark);
      border: 1px solid var(--bs-dark);
      color: white;
      font-weight: 600;
      border-radius: 12px;
      padding: 12px 28px;
      font-size: 0.95rem;
      transition: background 0.2s;
    }
    .btn-dark-custom:hover {
      background-color: var(--bs-primary);
      border-color: var(--bs-primary);
      color: white;
    }

    .text-link {
      color: var(--bs-primary);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .text-link:hover {
      text-decoration: underline;
      color: var(--bs-primary-hover);
    }

    /* 导航 */
    .navbar {
      background-color: #FFFFFF;
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      padding: 0;
      height: 64px;
      z-index: 1030;
    }
    .navbar-brand {
      font-family: var(--bs-font-serif);
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--bs-dark);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .logo-icon {
      width: 34px;
      height: 34px;
      background: var(--bs-primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.2rem;
      font-weight: bold;
    }
    .nav-link {
      color: var(--text-muted) !important;
      font-weight: 500;
      font-size: 0.9rem;
      padding: 0.5rem 0.9rem;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--bs-primary) !important;
    }
    .navbar-nav .nav-link.active {
      border-bottom: 2px solid var(--bs-primary);
    }
    .search-box {
      background: var(--soft-gray);
      border-radius: 20px;
      padding: 0.3rem 0.9rem;
      display: flex;
      align-items: center;
      gap: 6px;
      color: #9f9a94;
      font-size: 0.85rem;
    }
    .navbar-toggler {
      border: none;
    }
    @media (max-width: 992px) {
      .navbar {
        height: auto;
        min-height: 64px;
      }
      .navbar-collapse {
        background: white;
        padding: 1rem;
        box-shadow: 0 8px 20px rgba(0,0,0,0.05);
      }
    }

    /* 区块间距 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 55px 0;
      }
    }

    .section-title {
      font-size: 2.4rem;
      color: var(--bs-dark);
      margin-bottom: 0.5rem;
      font-weight: 700;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 2.5rem;
    }

    /* Hero */
    .hero-bg {
      background: linear-gradient(180deg, #FDF3E8 0%, #FBF7F2 100%);
    }
    .hero-img {
      border-radius: 20px;
      box-shadow: var(--card-shadow);
      width: 100%;
      height: auto;
    }
    .badge-experience {
      background: rgba(251, 247, 242, 0.9);
      border: 1px solid var(--sand-gold);
      color: var(--bs-dark);
      border-radius: 40px;
      padding: 0.5rem 1.2rem;
      font-weight: 600;
      display: inline-block;
    }

    /* 卡片 */
    .service-card {
      background: #FFFFFF;
      border-radius: 20px;
      padding: 2.5rem 1.8rem;
      box-shadow: var(--card-shadow);
      transition: all 0.25s ease;
      height: 100%;
      text-align: center;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .icon-copper {
      color: var(--copper-green);
      font-size: 3rem;
      margin-bottom: 1rem;
    }

    .case-card {
      background: #FFFFFF;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: 0.25s;
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
    }
    .case-img-wrap {
      position: relative;
      overflow: hidden;
    }
    .case-img-wrap img {
      aspect-ratio: 4 / 3;
      object-fit: cover;
      width: 100%;
    }
    .case-overlay {
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(232, 122, 42, 0.7);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: 0.2s;
      color: white;
      font-weight: 600;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }

    .stat-badge {
      text-align: center;
    }
    .stat-number {
      font-family: var(--bs-font-serif);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--bs-primary);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    .process-step {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--bs-primary);
      color: white;
      border-radius: 50%;
      font-weight: 700;
      font-size: 1.3rem;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      color: var(--bs-dark);
      box-shadow: none;
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-button:not(.collapsed) {
      background: white;
      color: var(--bs-primary);
      box-shadow: none;
    }
    .accordion-button::after {
      background-image: none;
      content: "+";
      font-size: 1.5rem;
      color: var(--bs-primary);
      font-weight: 400;
      width: auto;
      height: auto;
    }
    .accordion-button:not(.collapsed)::after {
      content: "−";
    }

    .footer {
      background: var(--bs-dark);
      color: var(--footer-text);
      padding: 3rem 0 1.5rem;
    }
    .footer a {
      color: var(--footer-text);
    }
    .footer a:hover {
      color: white;
    }
    .footer-logo {
      font-family: var(--bs-font-serif);
      color: white;
      font-weight: 700;
    }

    .form-control {
      border-radius: 12px;
      border: 1px solid #E0DBD4;
      padding: 0.7rem 1rem;
      background: white;
    }
    .form-control:focus {
      border-color: var(--bs-primary);
      box-shadow: none;
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 2rem;
      }
      .stat-number {
        font-size: 2.2rem;
      }
    }