/* roulang page: index */
/* 自定义设计变量与补充样式 */
    :root {
      --deep-charcoal: #1E2024;
      --competition-orange: #F47920;
      --warm-porcelain: #F8F9FA;
      --slate-green: #5F7D8C;
      --text-body: #4A4D52;
      --border-light: #E9ECEF;
      --card-shadow: 0 4px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 12px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-smooth: all 0.3s ease;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
      background-color: #ffffff;
      color: var(--text-body);
      line-height: 1.8;
      font-weight: 400;
      box-sizing: border-box;
    }
    *, *::before, *::after {
      box-sizing: border-box;
    }
    /* 标题字体重置 */
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--deep-charcoal);
    }
    h2 {
      font-size: 2.3rem;
      margin-bottom: 1rem;
    }
    .section-subtitle {
      font-weight: 600;
      color: var(--slate-green);
      line-height: 1.5;
      font-size: 1.15rem;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }
    .text-accent-number {
      font-family: 'DIN Alternate', 'Arial', sans-serif;
      font-weight: 800;
      color: var(--competition-orange);
    }
    /* 自定义组件 */
    .btn-primary {
      background-color: var(--competition-orange);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.8rem;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 8px rgba(244,121,32,0.2);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: #E06A10;
      box-shadow: 0 8px 18px rgba(244,121,32,0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--deep-charcoal);
      color: var(--deep-charcoal);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.8rem;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
    }
    .btn-outline:hover {
      background-color: var(--deep-charcoal);
      color: white;
    }
    .card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    /* 导航 */
    .nav-blur {
      background: rgba(248, 249, 250, 0.9);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(233,236,239,0.7);
    }
    .nav-link {
      color: var(--deep-charcoal);
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--competition-orange);
    }
    /* 手风琴图标 */
    .faq-icon {
      transition: transform 0.3s ease;
    }
    details[open] .faq-icon {
      transform: rotate(45deg);
    }
    /* 对比表格样式 */
    .compare-table td {
      padding: 1rem 1.5rem;
      vertical-align: middle;
    }
    .compare-bg-advantage {
      background-color: rgba(95,125,140,0.06);
    }
    .compare-bg-disadvantage {
      background-color: rgba(30,32,36,0.03);
    }
    /* 移动端适配 */
    @media (max-width: 768px) {
      h2 {
        font-size: 1.9rem;
      }
      .hero-img {
        order: -1;
      }
      .mobile-menu {
        display: none;
      }
      .mobile-menu.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        box-shadow: 0 12px 20px rgba(0,0,0,0.05);
        padding: 1.5rem;
        gap: 1rem;
        z-index: 50;
      }
    }
    /* 自定义滚动条隐藏（仅用于案例展示滚动） */
    .no-scrollbar::-webkit-scrollbar {
      display: none;
    }
    .no-scrollbar {
      -ms-overflow-style: none;
      scrollbar-width: none;
    }