/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #F97316;
      --accent-hover: #EA580C;
      --bg-light: #F8FAFC;
      --text-secondary: #64748B;
      --text-dark: #1E293B;
      --border-light: #E2E8F0;
      --success: #10B981;
      --card-shadow: 0 1px 3px rgba(15,23,42,0.08), 0 1px 2px rgba(15,23,42,0.06);
      --card-hover-shadow: 0 10px 25px rgba(15,23,42,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 8px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      color: #1E293B;
      background-color: #ffffff;
      margin: 0;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 768px) {
      .container-custom {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    /* 导航栏样式 */
    .nav-blur {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid #E2E8F0;
    }
    .nav-link {
      position: relative;
      font-weight: 500;
      color: #64748B;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background-color: #0F172A;
      transition: transform 0.25s ease;
    }
    .nav-link:hover {
      color: #0F172A;
    }
    .nav-link:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    /* 按钮系统 */
    .btn-primary {
      background-color: #F97316;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 8px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      border: none;
      box-shadow: 0 4px 6px rgba(249,115,22,0.2);
      transition: background-color 0.2s, box-shadow 0.2s, transform 0.1s;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: #EA580C;
      box-shadow: 0 8px 15px rgba(249,115,22,0.3);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid #0F172A;
      color: #0F172A;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 8px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      transition: background-color 0.2s, color 0.2s;
      cursor: pointer;
    }
    .btn-secondary:hover {
      background-color: rgba(15,23,42,0.08);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 8px;
      transition: all 0.2s;
      cursor: pointer;
    }
    .btn-ghost:hover {
      background: white;
      color: #0F172A;
    }
    /* 卡片通用 */
    .card {
      background: #fff;
      border-radius: 12px;
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      padding: 2rem;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid #E2E8F0;
    }
    .faq-question {
      cursor: pointer;
      padding: 1.2rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.125rem;
      color: #0F172A;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background-color: #F8FAFC;
      padding-left: 0.5rem;
      padding-right: 0.5rem;
      border-radius: 8px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: #475569;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }
    .faq-icon {
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 英雄区域图片咬合 */
    .hero-image-clip {
      border-top-left-radius: 40px;
      border-bottom-left-radius: 40px;
      overflow: hidden;
    }
    @media (max-width: 1023px) {
      .hero-image-clip {
        border-radius: 12px;
        width: 100%;
        height: 320px;
      }
    }
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 767px) {
      .mobile-menu.open {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        bottom: 0;
        background: white;
        padding: 2rem;
        z-index: 50;
        gap: 1.5rem;
        align-items: flex-start;
      }
    }
    .section-spacing {
      padding-top: 6rem;
      padding-bottom: 6rem;
    }
    @media (max-width: 767px) {
      .section-spacing {
        padding-top: 4rem;
        padding-bottom: 4rem;
      }
    }