/* roulang page: index */
:root {
      --amber: #E67E22;
      --amber-deep: #C0651A;
      --amber-soft: rgba(230, 126, 34, 0.08);
      --green: #00A86B;
      --warning: #FF8C00;
      --red: #E74C3C;
      --bg: #F7F5F2;
      --card: #FFFFFF;
      --text: #1E1E1E;
      --gray: #6B6B6B;
      --line: #EBE9E5;
      --radius-card: 16px;
      --radius-sm: 10px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航桌面 */
    .navbar {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--line);
      position: sticky;
      top: 0;
      z-index: 50;
      transition: all 200ms ease;
    }
    .nav-link {
      position: relative;
      color: var(--text);
      font-weight: 500;
      font-size: 16px;
      transition: color 200ms;
      text-decoration: none;
      padding: 8px 0;
    }
    .nav-link:hover {
      color: var(--amber);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--amber);
      border-radius: 2px;
    }
    .btn-primary {
      background: var(--amber);
      color: white;
      border-radius: 10px;
      padding: 0 24px;
      height: 48px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      transition: all 200ms ease;
      text-decoration: none;
      min-width: 140px;
    }
    .btn-primary:hover {
      background: var(--amber-deep);
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(230,126,34,0.25);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--amber);
      color: var(--amber);
      border-radius: 10px;
      padding: 0 24px;
      height: 48px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 200ms ease;
      text-decoration: none;
    }
    .btn-secondary:hover {
      background: var(--amber-soft);
    }
    /* 移动底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 -2px 10px rgba(0,0,0,0.04);
      height: 64px;
      z-index: 60;
      justify-content: space-around;
      align-items: center;
      padding-bottom: env(safe-area-inset-bottom);
      border-top: 1px solid var(--line);
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--gray);
      font-size: 12px;
      text-decoration: none;
      font-weight: 500;
      transition: color 200ms;
    }
    .mobile-nav-item.active {
      color: var(--amber);
    }
    .mobile-nav-icon {
      font-size: 20px;
      margin-bottom: 2px;
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      body {
        padding-bottom: 80px;
      }
    }
    /* 卡片通用 */
    .card {
      background: var(--card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--line);
      transition: box-shadow 200ms ease, transform 200ms ease;
      padding: 28px 32px;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    /* 指标数字 */
    .metric-number {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--amber);
    }
    .metric-green {
      color: var(--green);
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--line);
      padding: 16px 0;
    }
    .faq-question {
      font-size: 18px;
      font-weight: 500;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      color: var(--text);
      transition: color 200ms;
      padding-left: 12px;
      border-left: 4px solid transparent;
    }
    .faq-item.active .faq-question {
      color: var(--amber);
      border-left-color: var(--amber);
      background: var(--amber-soft);
      border-radius: 0 8px 8px 0;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease-in-out, padding 0.25s;
      font-size: 15px;
      color: var(--gray);
      line-height: 1.7;
      padding-left: 16px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
      padding-bottom: 8px;
    }
    /* 输入框聚焦光晕 */
    input[type="email"] {
      border: 1px solid var(--line);
      border-radius: 30px;
      padding: 0 24px;
      height: 48px;
      font-size: 16px;
      outline: none;
      transition: border 200ms, box-shadow 200ms;
      width: 100%;
    }
    input[type="email"]:focus {
      border-color: var(--amber);
      box-shadow: 0 0 0 3px rgba(230,126,34,0.3);
    }
    /* 背景纹理 */
    .bg-texture {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .bg-texture::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(247,245,242,0.85);
    }
    .card-img-top {
      width: 100%;
      height: 160px;
      object-fit: cover;
      border-radius: 12px;
    }
    .icon-bg {
      background: var(--amber-soft);
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--amber);
      font-size: 24px;
    }