/* roulang page: index */
:root {
      --deep-purple-start: #1E0A3C;
      --deep-purple-end: #3A0CA3;
      --electric-orange: #FF6B35;
      --soft-purple-gray: #B8A9C9;
      --bg-light: #F9F7FC;
      --white: #FFFFFF;
      --text-dark: #1E0A3C;
      --text-soft: #6B5B7B;
      --border-light: rgba(184, 169, 201, 0.3);
      --shadow-card: 0 8px 30px rgba(30, 10, 60, 0.08);
      --shadow-hover: 0 16px 40px rgba(30, 10, 60, 0.15);
      --radius-xl: 20px;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-pill: 50px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.3s ease;
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      padding: 0 24px;
      height: 72px;
    }
    .nav-left, .nav-right {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--deep-purple-end);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .logo-icon {
      font-size: 1.8rem;
      color: var(--electric-orange);
    }
    .nav-link {
      font-size: 1rem;
      font-weight: 500;
      color: var(--text-dark);
      padding: 8px 4px;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-link:hover {
      color: var(--deep-purple-end);
      border-bottom-color: var(--electric-orange);
    }
    .btn-nav {
      background: var(--electric-orange);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.95rem;
      box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
    }
    .btn-nav:hover {
      background: #e55a2b;
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      color: var(--deep-purple-end);
    }
    /* 移动端导航 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      z-index: 99;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
      padding: 8px 0;
      border-bottom: 1px solid var(--border-light);
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, var(--deep-purple-start) 0%, var(--deep-purple-end) 100%);
      color: white;
      padding: 140px 0 100px;
      margin-top: 72px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 6fr 4fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--soft-purple-gray);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .btn-primary {
      background: linear-gradient(135deg, #3A0CA3, #5A1FD6);
      color: white;
      padding: 16px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 1.1rem;
      box-shadow: 0 8px 20px rgba(58, 12, 163, 0.4);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #4B1ABF, #6F2FEA);
      transform: scale(1.03);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--electric-orange);
      color: white;
      padding: 16px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 1.1rem;
    }
    .btn-secondary:hover {
      background: var(--electric-orange);
      color: white;
    }
    .badge-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .badge {
      background: var(--electric-orange);
      color: white;
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      white-space: nowrap;
    }
    .hero-right img {
      border-radius: var(--radius-xl);
      box-shadow: 0 0 40px rgba(255, 107, 53, 0.25);
      width: 100%;
      height: auto;
    }
    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    .section-sub {
      text-align: center;
      color: var(--text-soft);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .highlight-card {
      background: white;
      border-radius: var(--radius-xl);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.25s ease, box-shadow 0.25s ease, border 0.2s;
      border: 1px solid transparent;
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--deep-purple-end);
    }
    .highlight-icon {
      width: 64px;
      height: 64px;
      background: #F3EFFF;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--deep-purple-end);
      margin-bottom: 20px;
    }
    .highlight-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .highlight-desc {
      color: var(--text-soft);
      margin-bottom: 20px;
      font-size: 0.95rem;
    }
    .highlight-badge {
      background: #FFF1E9;
      color: var(--electric-orange);
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
    }
    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      background: #E9E0F5;
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      background: var(--electric-orange);
      color: white;
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 10px;
    }
    .case-title {
      font-weight: 600;
      font-size: 1.1rem;
      margin-bottom: 8px;
    }
    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: start;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-xl);
      padding: 40px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
    }
    .compare-card.recommended {
      border: 2px solid var(--deep-purple-end);
      position: relative;
    }
    .recommend-badge {
      position: absolute;
      top: -14px;
      right: 24px;
      background: var(--electric-orange);
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.8rem;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .check {
      color: #2E7D32;
      font-size: 1.2rem;
    }
    .cross {
      color: #C62828;
      font-size: 1.2rem;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      border: 1px solid var(--border-light);
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      background: none;
      width: 100%;
      text-align: left;
      font-size: 1.1rem;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-soft);
      display: none;
      background: #F7F2FF;
      border-radius: 0 0 8px 8px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1E0A3C, #3A0CA3);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-banner h2 {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .btn-cta {
      background: var(--electric-orange);
      color: white;
      padding: 18px 48px;
      border-radius: 50px;
      font-size: 1.2rem;
      font-weight: 700;
      margin-top: 32px;
      box-shadow: 0 0 25px rgba(255,107,53,0.6);
    }
    .btn-cta:hover {
      background: #ff7f50;
      transform: scale(1.04);
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }
    .footer-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--deep-purple-end);
    }
    .footer-links a {
      display: block;
      margin-bottom: 10px;
      color: var(--text-soft);
    }
    .social-icons i {
      font-size: 1.5rem;
      margin-right: 16px;
      color: var(--deep-purple-end);
    }
    .copyright {
      border-top: 1px solid var(--border-light);
      padding: 24px 0;
      text-align: center;
      color: var(--text-soft);
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
      .cases-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-left, .nav-right { display: none; }
      .hamburger { display: block; }
      .mobile-menu.active { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .highlights-grid, .cases-grid, .compare-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-left h1 { font-size: 2.2rem; }
      .section-title { font-size: 1.8rem; }
    }