/* roulang page: index */
:root {
      --primary-deep: #0A2E4D;
      --accent-orange: #F15A24;
      --bg-light: #F7F9FC;
      --white: #FFFFFF;
      --text-main: #2C3E50;
      --text-muted: #5A6F7C;
      --shadow-sm: 0 4px 20px rgba(10, 46, 77, 0.06);
      --shadow-hover: 0 12px 28px rgba(10, 46, 77, 0.12);
      --border-radius-card: 16px;
      --border-radius-btn: 8px;
      --transition: all 0.25s ease;
      --max-width: 1280px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      font-weight: 400;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    section {
      padding: 100px 0;
      scroll-margin-top: calc(var(--nav-height) + 16px);
    }
    h1, h2, h3 {
      font-weight: 700;
      font-family: 'Noto Sans SC', system-ui, sans-serif;
      color: var(--primary-deep);
    }
    h1 {
      font-size: 2.8rem;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    h2 {
      font-size: 2.2rem;
      margin-bottom: 16px;
      text-align: center;
    }
    h3 {
      font-size: 1.3rem;
    }
    p {
      color: var(--text-muted);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 34px;
      font-weight: 600;
      font-size: 16px;
      border-radius: var(--border-radius-btn);
      cursor: pointer;
      transition: var(--transition);
      border: none;
      background: transparent;
      font-family: 'Noto Sans SC', sans-serif;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      box-shadow: 0 4px 12px rgba(241, 90, 36, 0.25);
    }
    .btn-primary:hover {
      background: #d94a1a;
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(241, 90, 36, 0.3);
    }
    .btn-outline {
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      background: transparent;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
      border-color: var(--primary-deep);
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      height: var(--nav-height);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
      z-index: 1000;
      border-bottom: 1px solid rgba(10,46,77,0.06);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-weight: 800;
      font-size: 1.7rem;
      color: var(--primary-deep);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--accent-orange);
      font-size: 2rem;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
      border-bottom: 3px solid transparent;
      transition: var(--transition);
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary-deep);
      border-bottom-color: var(--accent-orange);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      background: none;
      border: none;
      color: var(--primary-deep);
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      padding-top: calc(var(--nav-height) + 60px);
      padding-bottom: 60px;
      background: var(--white);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      margin-bottom: 24px;
    }
    .hero-left .subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 40px;
      max-width: 90%;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 420px;
      box-shadow: var(--shadow-sm);
      position: relative;
      overflow: hidden;
    }

    /* 核心亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 40px;
    }
    .highlight-card {
      background: var(--white);
      padding: 36px 28px;
      border-radius: var(--border-radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: left;
    }
    .highlight-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-icon {
      font-size: 2.3rem;
      color: var(--accent-orange);
      margin-bottom: 24px;
    }
    .highlight-card h3 {
      margin-bottom: 14px;
    }

    /* 案例瀑布 (Masonry风格) */
    .masonry-grid {
      columns: 3;
      column-gap: 30px;
      margin-top: 30px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 30px;
      border-radius: var(--border-radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      background: var(--white);
      position: relative;
    }
    .case-card:hover {
      transform: scale(1.02);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      display: block;
      object-fit: cover;
    }
    .case-info {
      padding: 20px;
    }
    .case-info h3 {
      color: var(--primary-deep);
    }

    /* 方案对比表 */
    .comparison-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-top: 50px;
    }
    .plan-col {
      background: var(--white);
      padding: 42px 30px;
      text-align: center;
      border-right: 1px solid rgba(10,46,77,0.05);
    }
    .plan-col:last-child {
      border-right: none;
    }
    .plan-highlight {
      background: var(--primary-deep);
      color: white;
      position: relative;
      transform: scale(1.03);
      border-radius: 20px;
      box-shadow: var(--shadow-hover);
      z-index: 2;
      border: none;
    }
    .badge-recommend {
      background: var(--accent-orange);
      color: white;
      padding: 6px 19px;
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 700;
      display: inline-block;
      margin-bottom: 16px;
    }
    .plan-price {
      font-size: 2.7rem;
      font-weight: 800;
      font-family: 'Inter', sans-serif;
    }

    /* 数据背书 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      margin: 60px 0;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent-orange);
      font-family: 'Inter', sans-serif;
    }

    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 40px auto 0;
    }
    .faq-item {
      background: #f4f7fb;
      border-radius: 16px;
      margin-bottom: 18px;
      padding: 22px 28px;
      cursor: pointer;
      transition: var(--transition);
      border-left: 4px solid transparent;
    }
    .faq-item.active {
      background: var(--white);
      border-left-color: var(--accent-orange);
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary-deep);
      border-radius: 28px;
      padding: 64px 48px;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #0A2E4D;
      color: #B0C4D9;
      padding: 70px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .highlights-grid { grid-template-columns: repeat(2, 1fr); }
      .masonry-grid { columns: 2; }
      .comparison-table { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu { 
        display: none; 
        position: absolute; top: 72px; left: 0; background: white; width: 100%; flex-direction: column; padding: 24px; gap: 20px; 
      }
      .nav-menu.show { display: flex; }
      .hamburger { display: block; }
      .highlights-grid { grid-template-columns: 1fr; }
      .masonry-grid { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
    }