/* roulang page: index */
:root {
      --primary: #1A5F3A;
      --primary-dark: #154C2E;
      --accent: #FF6B35;
      --bg-light: #F8FAF9;
      --surface: #FFFFFF;
      --text-dark: #1B2A1E;
      --text-muted: #6B7D6E;
      --border: #E2EBE4;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
      --space-section: 120px;
      --container-max: 1200px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      margin: 0;
      padding-top: 76px;
      -webkit-font-smoothing: antialiased;
    }

    a, button, input, textarea {
      font-family: inherit;
    }

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

    h1, h2, h3, h4, p {
      margin: 0;
    }

    .container-custom {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    section {
      padding: var(--space-section) 0;
    }

    /* 顶部导航 */
    .navbar-custom {
      background: white;
      border-bottom: 1px solid var(--border);
      height: 72px;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1030;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .nav-logo {
      font-weight: 700;
      font-size: 24px;
      letter-spacing: 0.5px;
      color: var(--primary);
      text-decoration: none;
      white-space: nowrap;
      display: flex;
      align-items: center;
    }
    .nav-logo:hover { color: var(--primary-dark); }

    .desktop-nav .nav-link {
      color: var(--text-dark);
      padding: 0 18px;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.25s;
      text-decoration: none;
      border: none;
      background: none;
      cursor: pointer;
    }
    .desktop-nav .nav-link:hover {
      color: var(--primary);
    }

    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      transition: background 0.25s ease;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary-custom:hover {
      background: var(--primary-dark);
      color: white;
    }

    .btn-outline-primary-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.25s ease;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline-primary-custom:hover {
      background: var(--primary);
      color: white;
    }

    .btn-accent {
      background: var(--accent);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      transition: opacity 0.2s;
    }
    .btn-accent:hover { opacity: 0.9; color: white; }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: white;
      border-top: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: space-around;
      z-index: 1030;
    }
    .mobile-bottom-nav .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 11px;
      transition: color 0.2s;
    }
    .mobile-bottom-nav .tab-item i {
      font-size: 20px;
      margin-bottom: 2px;
    }
    .mobile-bottom-nav .tab-item.active {
      color: var(--primary);
    }

    /* Hero */
    .hero-section {
      min-height: 85vh;
      background-color: #F8FAF9;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-overlay {
      background: linear-gradient(135deg, rgba(26,95,58,0.08) 0%, rgba(255,107,53,0.05) 100%);
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      color: var(--text-dark);
    }
    .hero-sub {
      font-size: 16px;
      color: var(--text-muted);
      margin: 20px 0 28px;
    }
    .hero-image-col {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-image-col img {
      border-radius: 16px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
      max-width: 100%;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      text-align: center;
      color: var(--text-dark);
      margin-bottom: 12px;
    }
    .title-decor {
      width: 40px;
      height: 4px;
      background: var(--primary);
      margin: 0 auto 48px;
    }

    .card-custom {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      height: 100%;
      border: none;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .icon-badge {
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 18px;
    }

    .service-img {
      border-radius: 12px 12px 0 0;
      aspect-ratio: 16/9;
      object-fit: cover;
      background: #E2EBE4;
    }
    .stats-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }
    .case-card img {
      aspect-ratio: 4/3;
      object-fit: cover;
      background: #E2EBE4;
    }

    .process-step-circle {
      width: 40px;
      height: 40px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
      margin: 0 auto 15px;
    }

    .accordion-custom .accordion-button {
      background: white;
      color: var(--text-dark);
      font-weight: 600;
      font-size: 18px;
      box-shadow: none;
      border: none;
      border-bottom: 1px solid var(--border);
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--primary);
      background: white;
    }
    .cta-banner {
      background: var(--primary);
      color: white;
      border-radius: 24px;
      text-align: center;
      padding: 60px 20px;
    }
    .footer-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 15px;
      transition: color 0.2s;
    }
    .footer-links a:hover { color: var(--primary); }

    /* 响应式调整 */
    @media (max-width: 991px) {
      .hero-title { font-size: 36px; }
      .section-title { font-size: 30px; }
      section { padding: 80px 0; }
      .hero-image-col { margin-top: 32px; }
    }
    @media (max-width: 767px) {
      body { padding-bottom: 60px; }
      .hero-title { font-size: 30px; }
      .section-title { font-size: 28px; }
      .hero-section, .hero-overlay { min-height: 70vh; }
      .btn-primary-custom, .btn-outline-primary-custom { width: 100%; }
    }
    @media (min-width: 768px) {
      .mobile-bottom-nav { display: none; }
    }