/* roulang page: index */
:root {
      --primary: #E8450B;
      --gold: #C8963E;
      --bg-dark: #0F0F0F;
      --bg-card: #242424;
      --text-dim: #B0B0B0;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      background-color: #0F0F0F;
      color: #FFFFFF;
      font-family: 'PingFang SC', 'MiSans', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
      line-height: 1.75;
      letter-spacing: 0.01em;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    button, input {
      font-family: inherit;
    }

    /* 导航毛玻璃 */
    .nav-blur {
      background: rgba(15, 15, 15, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }

    /* 主 CTA 按钮 */
    .btn-primary {
      background-color: var(--primary);
      color: #fff;
      font-weight: 600;
      border-radius: 6px;
      padding: 16px 36px;
      display: inline-block;
      transition: all 0.25s cubic-bezier(0.25,0.46,0.45,0.94);
      cursor: pointer;
      border: none;
    }
    .btn-primary:hover {
      background-color: #C93A08;
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.3);
      color: #fff;
      font-weight: 600;
      border-radius: 6px;
      padding: 16px 36px;
      display: inline-block;
      transition: all 0.25s ease;
      cursor: pointer;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 卡片样式 */
    .card {
      background: #242424;
      border: 1px solid rgba(255,255,255,0.06);
      box-shadow: 0 4px 24px rgba(0,0,0,0.4);
      border-radius: 12px;
      padding: 28px 36px;
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 32px rgba(0,0,0,0.6);
    }
    .pricing-card-highlight {
      border-color: rgba(200, 150, 62, 0.5);
      box-shadow: 0 0 28px rgba(200, 150, 62, 0.15);
      position: relative;
    }
    .pricing-card-highlight::before {
      content: '';
      position: absolute;
      inset: 0;
      border-radius: 12px;
      padding: 1px;
      background: linear-gradient(135deg, rgba(200,150,62,0.4), transparent);
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask-composite: exclude;
      pointer-events: none;
    }

    /* 数字递增动画 */
    .counter-number {
      font-family: 'DIN Alternate', 'Montserrat', sans-serif;
      font-weight: 800;
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      font-weight: 600;
      color: #fff;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: #B0B0B0;
      line-height: 1.75;
      max-width: 640px;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-bottom: 16px;
    }
    .faq-arrow {
      transition: transform 0.35s ease;
      font-size: 14px;
      color: #6B6B6B;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      color: var(--primary);
    }

    /* 滚动渐显 */
    .fade-up {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* 导航高亮 */
    .nav-link.active {
      color: var(--primary);
      border-bottom: 2px solid var(--primary);
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 767px) {
      .desktop-menu {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
      .btn-primary, .btn-outline {
        padding: 14px 28px;
        font-size: 16px;
        width: 100%;
        text-align: center;
      }
    }
    /* 非对称栅格自定义 */
    .grid-features {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .grid-features .main-card {
      grid-row: span 2;
    }
    @media (max-width: 1023px) {
      .grid-features {
        grid-template-columns: 1fr;
      }
      .grid-features .main-card {
        grid-row: span 1;
      }
    }
    /* 场景交错 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 5;
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.06);
    }
    .scenario-text {
      flex: 4;
    }
    @media (max-width: 1023px) {
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
        gap: 32px;
      }
    }
    /* 数字滚动区域 */
    .stats-scroll {
      display: flex;
      gap: 40px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
      padding-bottom: 16px;
    }
    .stats-scroll::-webkit-scrollbar {
      height: 4px;
    }
    .stats-scroll::-webkit-scrollbar-thumb {
      background: rgba(255,255,255,0.15);
      border-radius: 4px;
    }
    .stat-item {
      flex: 0 0 auto;
      scroll-snap-align: start;
      min-width: 180px;
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      font-family: 'DIN Alternate', 'Montserrat', sans-serif;
      color: #fff;
      line-height: 1.2;
    }
    .stat-label {
      color: #B0B0B0;
      font-size: 14px;
      margin-top: 8px;
    }