/* roulang page: index */
/* 自定义 CSS 变量与深度视觉覆写 */
    :root {
      --color-primary: #FF5E3A;
      --color-primary-dark: #FF3B1F;
      --color-accent: #FFB800;
      --color-dark: #1E1E2F;
      --color-bg-warm: #FFF9F5;
      --color-bg-light: #F5F0EC;
      --color-success: #00C853;
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.12);
      --text-body: #4A4A5A;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: #fff;
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      -webkit-font-smoothing: antialiased;
 transformation: all 0.2s ease;
    }
    h1, h2, h3, h4 {
      color: var(--color-dark);
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    .container-custom {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 主按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, #FF5E3A 0%, #FF3B1F 100%);
      color: white;
      font-weight: 600;
      border-radius: 50px;
      padding: 0.875rem 2.25rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
      box-shadow: 0 8px 18px rgba(255, 62, 89, 0.25);
      border: none;
      cursor: pointer;
      font-size: 1rem;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      transform: scale(1.03);
      background: linear-gradient(135deg, #FF3B1F 0%, #e02e10 100%);
      box-shadow: 0 14px 26px rgba(255, 50, 60, 0.35);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--color-primary);
      color: var(--color-primary);
      font-weight: 600;
      border-radius: 50px;
      padding: 0.75rem 2rem;
      transition: 0.25s ease;
      display: inline-flex;
      align-items: center;
    }
    .btn-secondary:hover {
      background: #FFF0EC;
      border-color: var(--color-primary-dark);
      color: var(--color-primary-dark);
    }
    .nav-link {
      color: var(--color-dark);
      font-weight: 500;
      padding: 0.5rem 1rem;
      transition: color 0.2s;
      text-decoration: none;
    }
    .nav-link:hover {
      color: var(--color-primary);
    }
    /* 卡片与板块样式 */
    .section-padding {
      padding: 5rem 1.5rem;
    }
    @media (max-width: 767px) {
      .section-padding {
        padding: 3.5rem 1rem;
      }
    }
    .card-solution {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      border: 1px solid rgba(0,0,0,0.02);
      text-align: center;
    }
    .card-solution:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card-hover);
    }
    .data-badge {
      background: linear-gradient(135deg, #FF5E3A, #FF3B1F);
      color: white;
      border-radius: 30px;
      padding: 0.15rem 1rem;
      font-weight: 700;
      font-size: 0.95rem;
      display: inline-block;
      margin-top: 0.5rem;
    }
    .bg-hero-gradient {
      background: linear-gradient(135deg, #1e1e2f 0%, #2a2a40 50%, #FF5E3A 100%);
      position: relative;
    }
    /* 动态纹理覆盖 */
    .hero-overlay {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.18;
      mix-blend-mode: overlay;
      position: absolute;
      inset: 0;
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid #eae2dc;
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 1.2rem 0;
      background: none;
      border: none;
      font-weight: 600;
      font-size: 1.15rem;
      color: var(--color-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      color: #4b4b5e;
    }
    .faq-item.active .faq-answer {
      max-height: 160px;
      padding-bottom: 1.5rem;
    }
    .plus-icon {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      border: 2px solid var(--color-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--color-primary);
      transition: 0.2s;
    }
    /* 移动端导航 */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-nav-links {
        display: none !important;
      }
      .mobile-menu {
        display: flex;
        align-items: center;
      }
      .hamburger {
        font-size: 1.8rem;
        background: none;
        border: none;
        color: var(--color-dark);
      }
      .nav-sidebar {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        background: #1E1E2F;
        padding: 2rem 1.5rem;
        flex-direction: column;
        display: flex;
        gap: 1.8rem;
        z-index: 100;
        transition: right 0.35s ease;
      }
      .nav-sidebar.open {
        right: 0;
      }
      .nav-sidebar a {
        color: white;
        font-size: 1.2rem;
        border-bottom: 1px solid rgba(255,255,255,0.15);
        padding-bottom: 0.5rem;
      }
    }
    /* 数据徽章数字加大 */
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--color-accent);
    }