/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --deep-blue: #0B2B5E;
      --dark-blue-bg: #0A1F3A;
      --cyber-green: #00C9A7;
      --vivid-orange: #FF6B35;
      --soft-bg: #F7F9FC;
      --card-shadow: 0 8px 24px rgba(11, 43, 94, 0.08);
      --card-hover-shadow: 0 16px 32px rgba(11, 43, 94, 0.12);
      --text-primary: #1E2A3A;
      --text-secondary: #4A5A6E;
      --border-light: rgba(11, 43, 94, 0.06);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--soft-bg);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 板块间距 */
    section {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }
    @media (max-width: 768px) {
      section {
        padding-top: 3.5rem;
        padding-bottom: 3.5rem;
      }
    }

    /* 导航毛玻璃效果 */
    .glass-nav {
      background: rgba(11, 43, 94, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .nav-link {
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover,
    .nav-link.active {
      color: #00C9A7;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 3px;
      background: #00C9A7;
      border-radius: 4px;
    }
    /* Mega面板 */
    .mega-panel {
      visibility: hidden;
      opacity: 0;
      transform: translateY(8px);
      transition: 0.2s ease;
      position: absolute;
      top: 100%;
      right: 0;
      background: white;
      border-radius: 16px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.15);
      padding: 1.5rem;
      display: grid;
      grid-template-columns: repeat(3, 180px);
      gap: 1rem;
      z-index: 50;
    }
    .group:hover .mega-panel {
      visibility: visible;
      opacity: 1;
      transform: translateY(0);
    }
    /* 移动端导航摘要 */
    details summary {
      list-style: none;
    }
    details summary::-webkit-details-marker {
      display: none;
    }

    /* 按钮体系 */
    .btn-primary {
      background: linear-gradient(135deg, #00C9A7, #00A88B);
      color: white;
      font-weight: 600;
      padding: 0.85rem 2.2rem;
      border-radius: 40px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      box-shadow: 0 8px 18px rgba(0,201,167,0.25);
      transition: all 0.2s ease;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
      box-shadow: 0 14px 24px rgba(0,201,167,0.35);
    }
    .btn-outline {
      border: 1.5px solid var(--deep-blue);
      color: var(--deep-blue);
      background: transparent;
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: 40px;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: var(--deep-blue);
      color: white;
    }
    .btn-orange {
      background: #FF6B35;
      color: white;
      font-weight: 700;
      padding: 0.9rem 2.5rem;
      border-radius: 50px;
      transition: 0.2s;
      box-shadow: 0 10px 20px rgba(255,107,53,0.3);
    }
    .btn-orange:hover {
      background: #e55a2c;
      transform: translateY(-2px);
    }

    /* 卡片系统 */
    .card {
      background: white;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      transition: all 0.25s;
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }
    .stat-badge {
      background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
      border-radius: 20px;
      padding: 1.5rem 1rem;
      text-align: center;
    }
    /* 手风琴 details */
    details.faq-item {
      background: white;
      border-radius: 12px;
      padding: 0.8rem 1.2rem;
      margin-bottom: 12px;
      transition: 0.2s;
    }
    details.faq-item[open] {
      background: #f8fafd;
    }
    details summary {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--deep-blue);
    }
    details summary span {
      color: #00C9A7;
      font-size: 1.5rem;
    }

    /* 案例瀑布流模拟 */
    .masonry {
      column-count: 3;
      column-gap: 1.5rem;
    }
    @media (max-width: 768px) {
      .masonry {
        column-count: 1;
      }
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 1.5rem;
      display: inline-block;
      width: 100%;
    }

    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0B2B5E 0%, #083157 100%);
      position: relative;
      overflow: hidden;
    }
    .cta-banner::before {
      content: "";
      position: absolute;
      inset: 0;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 200"><path d="M0,100 C360,20 720,140 1440,60 L1440,200 L0,200 Z" fill="rgba(0,201,167,0.08)"/></svg>') bottom repeat-x;
      opacity: 0.5;
    }