/* roulang page: index */
:root {
      --primary-green: #0B3B2F;
      --accent-orange: #F28C38;
      --bg-light: #F8F9FA;
      --card-bg: #FFFFFF;
      --soft-green-bg: #EEF2EF;
      --text-primary: #1A1A1A;
      --text-secondary: #5C6B7A;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(0,0,0,0.04);
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-lg: 12px;
      --radius-btn: 8px;
      --radius-dock: 40px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      margin: 0;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 浮动Dock导航 */
    .nav-dock {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-dock);
      box-shadow: 0 2px 16px rgba(0,0,0,0.06);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 8px 24px;
      margin: 16px auto 0;
      max-width: 1100px;
      width: calc(100% - 40px);
      position: relative;
      z-index: 50;
    }
    .nav-logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-green);
      letter-spacing: -0.5px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--primary-green);
    }
    .btn-primary {
      background-color: var(--accent-orange);
      color: white;
      border: none;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background-color 0.2s, transform 0.1s;
      display: inline-block;
      text-decoration: none;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background-color: #E07B2C;
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-green);
      color: var(--primary-green);
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background-color 0.2s, color 0.2s;
      display: inline-block;
      text-decoration: none;
      white-space: nowrap;
    }
    .btn-outline:hover {
      background-color: rgba(11,59,47,0.08);
    }
    /* 卡片通用 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.2s, transform 0.2s;
      border: 1px solid rgba(0,0,0,0.02);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    /* 深色案例卡片 */
    .dark-card {
      background: var(--primary-green);
      color: white;
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .accent-text {
      color: var(--accent-orange);
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-green);
      margin-bottom: 12px;
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 40px;
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.05);
      padding: 16px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding-top: 12px;
    }
    .faq-item.active {
      background-color: var(--soft-green-bg);
      margin: 0 -12px;
      padding-left: 12px;
      padding-right: 12px;
      border-radius: 8px;
    }
    /* 场景卡片左侧细条 */
    .scenario-card {
      border-left: 4px solid var(--accent-orange);
    }
    /* 移动端导航 */
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-green);
    }
    @media (max-width: 768px) {
      .nav-dock {
        padding: 8px 16px;
        width: calc(100% - 24px);
        margin-top: 8px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 20px;
        right: 20px;
        background: white;
        flex-direction: column;
        gap: 16px;
        padding: 24px;
        border-radius: 24px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        backdrop-filter: blur(20px);
        background: rgba(255,255,255,0.95);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-dock .btn-primary {
        display: none;
      }
      .nav-dock .mobile-cta {
        display: block;
      }
      .section-title {
        font-size: 1.8rem;
      }
    }
    @media (min-width: 769px) {
      .mobile-menu-toggle {
        display: none;
      }
      .mobile-cta {
        display: none;
      }
    }