/* roulang page: index */
:root {
      --primary: #0A8F5C;
      --primary-hover: #077A4E;
      --accent: #F04E23;
      --accent-light: #FFF0EC;
      --bg: #F7F8FA;
      --surface: #FFFFFF;
      --text: #1B1C1D;
      --text-secondary: #5F6368;
      --border: rgba(0,0,0,0.05);
      --radius-sm: 8px;
      --radius: 12px;
      --radius-lg: 20px;
      --radius-pill: 40px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.10);
      --transition: all 0.25s ease;
      --section-gap: 100px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'Segoe UI', 'PingFang SC', 'Source Han Sans CN', 'Helvetica Neue', system-ui, sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 44px;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 32px;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
    }

    .text-secondary {
      color: var(--text-secondary) !important;
    }

    .section {
      padding: var(--section-gap) 0;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 - 悬浮胶囊 */
    .navbar-custom {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 620px;
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-pill);
      padding: 8px 28px;
      z-index: 1050;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      transition: var(--transition);
      border: 1px solid rgba(10,143,92,0.1);
    }

    .navbar-scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
      border-color: transparent;
    }

    .nav-logo {
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      text-decoration: none;
      letter-spacing: 0.5px;
    }

    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      color: var(--text);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .btn-nav {
      background: var(--primary);
      color: white;
      border-radius: 30px;
      padding: 8px 20px;
      font-weight: 600;
      font-size: 14px;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
      margin-left: 8px;
      border: none;
    }

    .btn-nav:hover {
      background: var(--primary-hover);
      color: white;
      transform: scale(1.02);
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: 30px;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
      box-shadow: 0 4px 10px rgba(10,143,92,0.2);
    }

    .btn-primary-custom:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
      color: white;
    }

    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 34px;
      border-radius: 30px;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
    }

    .btn-outline-custom:hover {
      background: rgba(10,143,92,0.08);
      color: var(--primary-hover);
      border-color: var(--primary-hover);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #ffffff 0%, #f0f7f4 100%);
      padding: 160px 0 100px;
      position: relative;
      overflow: hidden;
    }

    .hero-bg-pattern {
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      pointer-events: none;
    }

    .hero-title {
      color: var(--text);
      margin-bottom: 1rem;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }

    .data-badge {
      background: white;
      border-radius: var(--radius);
      padding: 12px 20px;
      display: inline-flex;
      align-items: center;
      box-shadow: var(--shadow-card);
      margin-right: 12px;
    }

    /* 核心数据带 */
    .stat-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 28px 20px;
      text-align: center;
      box-shadow: var(--shadow-card);
      border-bottom: 4px solid var(--primary);
      transition: var(--transition);
    }

    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }

    /* 功能卡片 */
    .feature-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
      border: 1px solid rgba(0,0,0,0.02);
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: white;
      font-size: 26px;
    }

    /* 使用场景 */
    .scene-img {
      background: #e9edf0;
      border-radius: var(--radius);
      height: 260px;
      background-size: cover;
      background-position: center;
    }

    /* 案例卡片 */
    .case-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    /* 定价 */
    .pricing-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 2px solid transparent;
    }

    .pricing-highlight {
      border-color: var(--primary);
      position: relative;
    }

    .badge-popular {
      background: var(--accent);
      color: white;
      border-radius: 20px;
      padding: 4px 16px;
      font-size: 13px;
      font-weight: 600;
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--primary);
      box-shadow: none;
      border-left: 4px solid var(--primary);
    }

    .accordion-button:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 2px rgba(10,143,92,0.15);
    }

    .accordion-item {
      border: 1px solid rgba(0,0,0,0.04);
      border-radius: var(--radius) !important;
      margin-bottom: 12px;
    }

    /* 页脚 */
    .footer a {
      color: var(--text-secondary);
      text-decoration: none;
    }

    .footer a:hover {
      color: var(--primary);
    }

    @media (max-width: 768px) {
      :root {
        --section-gap: 70px;
      }
      h1 {
        font-size: 36px;
      }
      .navbar-custom {
        max-width: 95%;
        top: 12px;
        padding: 8px 18px;
      }
      .nav-links {
        gap: 14px;
      }
      .hero {
        padding: 140px 0 70px;
      }
    }

    @media (max-width: 576px) {
      .nav-links a:not(.btn-nav) {
        display: none;
      }
      .nav-logo {
        font-size: 18px;
      }
    }