/* roulang page: index */
:root {
      --primary: #2E8B57;
      --primary-dark: #1F6B3F;
      --secondary: #FF6B35;
      --secondary-dark: #E55A2B;
      --bg-light: #F4F7F5;
      --card-bg: #FFFFFF;
      --text-dark: #1B2A1F;
      --text-mid: #4A5B4F;
      --text-light: #8A9B8F;
      --border: #E0E8E3;
      --white: #FFFFFF;
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-pill: 24px;
      --radius-input: 10px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-btn: 0 4px 12px rgba(46,139,87,0.3);
      --font-din: 'DIN Alternate', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-mid);
      margin: 0;
      line-height: 1.7;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-body);
      color: var(--text-dark);
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: var(--primary);
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary-dark);
    }
    .container {
      max-width: 1200px;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 按钮重塑 */
    .btn-primary-custom {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      border: none;
      color: var(--white);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-size: 16px;
      transition: var(--transition);
      box-shadow: none;
    }
    .btn-primary-custom:hover {
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-dark) 100%);
      box-shadow: var(--shadow-btn);
      transform: translateY(-2px);
      color: var(--white);
    }
    .btn-secondary-custom {
      background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
      border: none;
      color: var(--white);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 16px 40px;
      font-size: 18px;
      transition: var(--transition);
      box-shadow: none;
    }
    .btn-secondary-custom:hover {
      background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--secondary-dark) 100%);
      box-shadow: 0 8px 18px rgba(255,107,53,0.4);
      transform: scale(1.05);
      color: var(--white);
    }
    /* 导航栏 */
    .navbar-custom {
      background: var(--white);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      height: 72px;
      padding: 0;
      position: sticky;
      top: 0;
      z-index: 1020;
      border-bottom: 1px solid var(--border);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 24px;
      color: var(--primary) !important;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar-brand i {
      font-size: 26px;
      color: var(--secondary);
    }
    .search-box {
      background: var(--bg-light);
      border-radius: 24px;
      padding: 8px 18px;
      display: flex;
      align-items: center;
      gap: 8px;
      border: 1px solid transparent;
      transition: var(--transition);
      width: 40%;
      min-width: 250px;
    }
    .search-box i {
      color: var(--secondary);
      font-size: 16px;
    }
    .search-box input {
      border: none;
      background: transparent;
      width: 100%;
      font-size: 15px;
      color: var(--text-dark);
      outline: none;
    }
    .search-box input::placeholder {
      color: var(--text-light);
      font-size: 14px;
    }
    .search-box:focus-within {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(46,139,87,0.15);
      background: var(--white);
    }
    .nav-link-custom {
      color: var(--text-mid) !important;
      font-size: 15px;
      font-weight: 500;
      padding: 8px 16px !important;
      transition: var(--transition);
    }
    .nav-link-custom:hover {
      color: var(--primary) !important;
    }
    .navbar-toggler {
      border: none;
      color: var(--primary);
    }
    @media (max-width: 991px) {
      .search-box {
        width: 100%;
        margin: 12px 0;
      }
      .navbar-collapse {
        background: var(--white);
        padding: 16px;
        border-radius: 12px;
        box-shadow: var(--shadow-md);
      }
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #2E8B57 0%, #1F6B3F 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      padding: 100px 0 120px;
      color: var(--white);
      position: relative;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      max-width: 700px;
      margin-bottom: 20px;
      color: white;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      max-width: 600px;
      margin-bottom: 32px;
    }
    .badge-hero {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-pill);
      padding: 12px 20px;
      color: white;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-weight: 600;
      margin-right: 12px;
      margin-bottom: 12px;
    }
    .badge-hero span {
      font-family: var(--font-din);
      font-size: 24px;
      color: white;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 32px;
      }
      .hero-sub {
        font-size: 16px;
      }
    }
    /* 区块标题 */
    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    .section-desc {
      color: var(--text-mid);
      max-width: 700px;
      margin: 0 auto 48px;
    }
    /* 非对称优势卡片 */
    .advantage-large {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      border: 1px solid var(--border);
    }
    .advantage-small {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border);
    }
    .advantage-large:hover, .advantage-small:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(46,139,87,0.1);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(46,139,87,0.1);
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 28px;
      margin-bottom: 20px;
    }
    .data-highlight {
      font-family: var(--font-din);
      font-size: 32px;
      color: var(--secondary);
      margin-top: 12px;
    }
    /* 功能卡片 */
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border);
      height: 100%;
    }
    .feature-card:hover {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(46,139,87,0.15);
    }
    .tag-group span {
      background: rgba(46,139,87,0.08);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
      margin-right: 6px;
    }
    /* 场景卡片 */
    .scene-card {
      background: #F9FBFA;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border);
    }
    .scene-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .scene-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .user-tag {
      background: var(--secondary);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-block;
      margin-bottom: 12px;
    }
    /* 数据徽章墙 */
    .metric-card {
      background: linear-gradient(135deg, #ffffff 0%, #F4F7F5 100%);
      border-radius: var(--radius-pill);
      padding: 28px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: scale(1.03);
    }
    .metric-number {
      font-family: var(--font-din);
      font-size: 40px;
      color: var(--primary);
      line-height: 1.2;
    }
    .metric-unit {
      color: var(--text-mid);
      font-size: 16px;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: rgba(46,139,87,0.05);
      color: var(--primary);
      font-weight: 600;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--primary);
    }
    .accordion-item {
      border: 1px solid var(--border);
      margin-bottom: 12px;
      border-radius: 12px !important;
      overflow: hidden;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #2E8B57 0%, #1F6B3F 100%);
      border-radius: 32px;
      padding: 80px 24px;
      color: white;
      margin: 80px 0;
    }
    /* 页脚 */
    .footer-custom {
      background: #1B2A1F;
      color: #C5D0C8;
      padding: 60px 0 30px;
    }
    .footer-link {
      color: #C5D0C8;
      transition: var(--transition);
      display: block;
      margin-bottom: 8px;
    }
    .footer-link:hover {
      color: var(--primary);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      font-size: 13px;
      color: #8A9B8F;
    }