/* roulang page: index */
:root {
      --deep-green: #1B5E20;
      --deep-green-hover: #145214;
      --vibrant-orange: #F57C00;
      --warm-white: #FAFAFA;
      --slate-gray: #546E7A;
      --light-gray-bg: #F0F2F5;
      --dark-footer: #37474F;
      --card-shadow: 0 4px 12px rgba(0,0,0,0.06);
      --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
      --border-light: #CFD8DC;
      --radius-card: 16px;
      --radius-pill: 999px;
      --transition-smooth: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: #FAFAFA;
      color: #1e293b;
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 浮动Dock导航 */
    .nav-dock {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 2rem);
      max-width: 1100px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 999px;
      padding: 0 24px;
      height: 56px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 50;
      box-shadow: 0 10px 25px -12px rgba(0,0,0,0.15);
      border: 1px solid rgba(255,255,255,0.5);
    }
    .nav-logo {
      font-weight: 700;
      font-size: 1.25rem;
      letter-spacing: 0.5px;
      color: #1B5E20;
      white-space: nowrap;
    }
    .nav-links a {
      color: #546E7A;
      font-size: 0.9rem;
      font-weight: 500;
      margin: 0 0.75rem;
      text-decoration: none;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: #1B5E20;
    }
    .btn-primary-sm {
      background: #F57C00;
      color: white;
      padding: 8px 20px;
      border-radius: 999px;
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
    }
    .btn-primary-sm:hover {
      background: #e06b00;
      box-shadow: 0 0 0 3px rgba(245,124,0,0.3);
    }
    /* 通用按钮 */
    .btn-primary {
      background: #1B5E20;
      color: white;
      padding: 12px 28px;
      border-radius: 999px;
      font-weight: 600;
      border: none;
      display: inline-block;
      text-decoration: none;
      transition: all 0.25s;
      box-shadow: 0 4px 10px rgba(27,94,32,0.25);
    }
    .btn-primary:hover {
      background: #145214;
      box-shadow: 0 0 0 3px rgba(27,94,32,0.2), 0 8px 18px rgba(0,0,0,0.15);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid #546E7A;
      color: #37474F;
      padding: 12px 28px;
      border-radius: 999px;
      font-weight: 600;
      display: inline-block;
      text-decoration: none;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      border-color: #1B5E20;
      background: rgba(27,94,32,0.05);
      color: #1B5E20;
    }
    .section-spacing {
      margin-top: 80px;
      margin-bottom: 80px;
    }
    @media (max-width: 768px) {
      .section-spacing {
        margin-top: 48px;
        margin-bottom: 48px;
      }
      .nav-dock {
        top: 10px;
        width: 95%;
        padding: 0 16px;
        height: 52px;
      }
      .nav-links {
        display: none; /* 移动端隐藏中部链接，仅保留logo和cta */
      }
      .nav-logo {
        font-size: 1.1rem;
      }
    }
    /* 卡片通用 */
    .card {
      background: white;
      border-radius: 16px;
      padding: 24px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.06);
      transition: all 0.25s ease;
    }
    .card:hover {
      box-shadow: 0 8px 24px rgba(0,0,0,0.12);
      transform: translateY(-4px);
    }
    /* FAQ手风琴 */
    .faq-item {
      background: #F5F7FA;
      border-radius: 12px;
      margin-bottom: 12px;
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 600;
      font-size: 1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: #1e293b;
    }
    .faq-answer {
      padding: 0 20px 16px;
      color: #546E7A;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    .faq-icon {
      transition: transform 0.3s;
      color: #1B5E20;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 表单 */
    input[type="email"] {
      height: 48px;
      padding: 0 20px;
      border: 1px solid #CFD8DC;
      border-radius: 999px;
      outline: none;
      transition: 0.2s;
      font-size: 1rem;
      width: 100%;
      max-width: 320px;
    }
    input[type="email"]:focus {
      border-color: #1B5E20;
      box-shadow: 0 0 0 3px rgba(27,94,32,0.15);
    }
    .submit-btn {
      height: 48px;
      background: #F57C00;
      color: white;
      border: none;
      border-radius: 999px;
      padding: 0 28px;
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
    }
    .submit-btn:hover {
      background: #e06b00;
      box-shadow: 0 0 0 3px rgba(245,124,0,0.3);
    }
    /* 装饰背景纹理 */
    .hero-pattern {
      background-image: radial-gradient(circle at 20% 30%, rgba(27,94,32,0.03) 1px, transparent 1px);
      background-size: 30px 30px;
    }