/* roulang page: index */
:root {
      --primary: #0D6B5E;
      --primary-dark: #094D45;
      --primary-light: rgba(13, 107, 94, 0.08);
      --accent: #C49A2B;
      --bg: #FAF8F5;
      --white: #FFFFFF;
      --text: #2C2C2C;
      --text-secondary: #6B6B6B;
      --border-light: #E8E5E1;
      --border-input: #D9D9D9;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(13,107,94,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: 0.25s ease;
      --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.8;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航 */
    .navbar {
      background-color: var(--white);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      padding: 0.8rem 0;
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 1000;
    }
    .navbar-brand {
      display: flex;
      align-items: center;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary) !important;
      letter-spacing: 0.5px;
    }
    .brand-icon {
      font-size: 1.8rem;
      margin-right: 8px;
      background: linear-gradient(135deg, #0D6B5E 0%, #1e9e8a 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .navbar-nav .nav-link {
      color: #4A4A4A !important;
      font-weight: 500;
      font-size: 0.95rem;
      margin: 0 0.3rem;
      padding: 0.5rem 0.8rem !important;
      transition: var(--transition);
      position: relative;
    }
    .navbar-nav .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--primary) !important;
    }
    .navbar-nav .nav-link:hover::after,
    .navbar-nav .nav-link.active::after {
      width: 60%;
    }
    .search-box {
      border: 1px solid #DDD;
      border-radius: 20px;
      padding: 0.4rem 1rem;
      display: flex;
      align-items: center;
      background: var(--white);
    }
    .search-box input {
      border: none;
      outline: none;
      background: transparent;
      font-size: 0.9rem;
      width: 140px;
      color: var(--text);
    }
    .search-box input::placeholder {
      color: #aaa;
    }
    .btn-primary-custom {
      background-color: var(--primary);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      background-color: var(--primary-dark);
      color: white;
      box-shadow: 0 4px 12px rgba(13,107,94,0.3);
    }
    .btn-outline-custom {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: var(--primary-light);
      color: var(--primary-dark);
    }
    .offcanvas {
      background: var(--white);
    }
    .offcanvas .nav-link {
      color: var(--text) !important;
      font-weight: 500;
      padding: 0.8rem 1.5rem;
      display: block;
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(rgba(13, 107, 94, 0.6), rgba(9, 77, 69, 0.7)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 76px;
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      text-shadow: 0 2px 8px rgba(0,0,0,0.3);
    }
    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.92;
      max-width: 600px;
    }
    .btn-hero-primary {
      background-color: var(--accent);
      border: none;
      color: #1e2b29;
      font-weight: 700;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-hero-primary:hover {
      background-color: #d4a82e;
      color: #0a1f1c;
      box-shadow: 0 6px 18px rgba(196,154,43,0.4);
    }
    .btn-hero-secondary {
      border: 2px solid white;
      background: transparent;
      color: white;
      font-weight: 600;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-hero-secondary:hover {
      background: rgba(255,255,255,0.15);
    }
    /* 指标看板 */
    .metrics-section {
      background: #F5F2EE;
      padding: 3rem 0;
    }
    .metric-item h3 {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 0.2rem;
    }
    .metric-item p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      font-weight: 500;
    }
    /* 通用区块标题 */
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 0.5rem;
    }
    .section-divider {
      width: 64px;
      height: 4px;
      background: var(--primary);
      margin: 0.8rem auto 2rem;
    }
    /* 卡片 */
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--primary-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: var(--primary);
      margin-bottom: 1.4rem;
      transition: var(--transition);
    }
    .service-card:hover .icon-circle {
      background: var(--primary);
      color: white;
    }
    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }
    .service-card p {
      color: var(--text-secondary);
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 0.95rem;
      transition: var(--transition);
    }
    .text-link:hover {
      color: var(--primary-dark);
    }
    /* 对比区 */
    .compare-col {
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
    }
    .compare-traditional {
      background: #fef2f2;
    }
    .compare-solution {
      background: #ecf9f5;
    }
    .compare-data {
      background: var(--white);
      box-shadow: var(--shadow-sm);
    }
    .check-icon {
      color: #0D6B5E;
      font-weight: bold;
      margin-right: 8px;
    }
    .cross-icon {
      color: #b91c1c;
      margin-right: 8px;
    }
    /* 流程 */
    .step-indicator {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .step-item {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 0.8rem;
    }
    .case-card img {
      border-radius: 10px 10px 0 0;
      height: 200px;
      object-fit: cover;
    }
    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background-color: #FAFAFA;
      color: var(--primary);
      box-shadow: none;
    }
    .accordion-item {
      border: 1px solid var(--border-light);
      margin-bottom: 0.8rem;
      border-radius: 8px !important;
    }
    /* 表单 */
    .form-section {
      background: #F5F2EE;
      border-radius: var(--radius-card);
    }
    .form-control {
      border: 1px solid var(--border-input);
      border-radius: var(--radius-input);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 0.2rem rgba(13,107,94,0.15);
    }
    /* 页脚 */
    .footer {
      background: #1E2B29;
      color: #B0B8B6;
      padding: 3rem 0 1.5rem;
    }
    .footer a {
      color: #B0B8B6;
      transition: var(--transition);
    }
    .footer a:hover {
      color: var(--accent);
    }
    .footer-brand {
      font-weight: 700;
      font-size: 1.3rem;
      color: white;
    }
    @media (max-width: 768px) {
      .hero-title { font-size: 2rem; }
      .metric-item h3 { font-size: 2rem; }
      .compare-col { margin-bottom: 1rem; }
    }
    @media (max-width: 576px) {
      .hero-title { font-size: 1.8rem; }
    }