/* roulang page: index */
:root {
      --primary: #0A4D2E;
      --primary-light: #0D6B3D;
      --accent: #F5A623;
      --bg: #F7F9F8;
      --text: #1E2B23;
      --text-soft: #4A5B50;
      --border-light: rgba(10,77,46,0.08);
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-card: 0 4px 20px rgba(10,77,46,0.06);
      --shadow-hover: 0 8px 30px rgba(10,77,46,0.12);
      --gradient-btn: linear-gradient(135deg, #0A4D2E 0%, #0D6B3D 100%);
      --gradient-accent: linear-gradient(135deg, #F5A623 0%, #F7B84E 100%);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, background-color 0.2s ease;
    }

    .container-custom {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航透明玻璃效果 */
    .glass-nav {
      background: rgba(255,255,255,0.25);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.3);
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
      transition: all 0.3s ease;
    }

    .nav-scrolled {
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 24px rgba(0,0,0,0.08);
      border-bottom: 1px solid rgba(10,77,46,0.1);
    }

    .nav-link {
      position: relative;
      font-weight: 500;
      color: #1E2B23;
      padding: 0.25rem 0;
      transition: color 0.2s;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background-color: #0A4D2E;
      transition: width 0.25s ease;
    }

    .nav-link:hover {
      color: #0A4D2E;
    }
    .nav-link:hover::after {
      width: 100%;
    }

    /* 按钮基础 */
    .btn-primary {
      background: var(--gradient-btn);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      box-shadow: 0 2px 8px rgba(10,77,46,0.2);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 6px 18px rgba(10,77,46,0.3);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid #0A4D2E;
      color: #0A4D2E;
      border-radius: var(--radius-btn);
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      transition: all 0.3s ease;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: #0A4D2E;
      color: white;
      transform: translateY(-2px);
    }

    .btn-cta {
      background: var(--gradient-accent);
      color: #1E2B23;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 1rem 2.5rem;
      box-shadow: 0 4px 24px rgba(245,166,35,0.4);
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
    }
    .btn-cta:hover {
      box-shadow: 0 8px 30px rgba(245,166,35,0.6);
      transform: scale(1.05);
    }

    .card {
      background: #FFFFFF;
      border-radius: 16px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .badge-energy {
      background: var(--gradient-accent);
      color: white;
      font-weight: 700;
      border-radius: 30px;
      padding: 0.25rem 1rem;
      font-size: 0.9rem;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(10,77,46,0.1);
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.2rem 0;
    }
    .faq-icon {
      font-size: 1.5rem;
      font-weight: 400;
      transition: transform 0.3s ease;
      color: #0A4D2E;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      padding: 0 0;
      color: #4A5B50;
    }
    .faq-item.active .faq-answer {
      max-height: 10rem;
      padding-bottom: 1.5rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    @media (max-width: 768px) {
      .mobile-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(24px);
        padding: 1.5rem;
        flex-direction: column;
        gap: 1.2rem;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        z-index: 40;
      }
      .mobile-menu.open {
        display: flex;
      }
    }