/* roulang page: index */
:root {
      --primary: #3A5FE5;
      --primary-dark: #1E3A8A;
      --gold: #C9A96E;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --bg-light: #F5F6FA;
      --white: #FFFFFF;
      --shadow-card: 0 2px 12px rgba(31, 35, 41, 0.06);
      --shadow-hover: 0 8px 24px rgba(31, 35, 41, 0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 200ms ease-out;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button {
      font-family: inherit;
      cursor: pointer;
    }

    /* 导航栏 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      z-index: 100;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--gold);
      font-size: 0.6rem;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      color: var(--text-secondary);
      font-weight: 500;
      padding: 4px 0;
      border-bottom: 2px solid transparent;
      transition: color var(--transition), border-color var(--transition);
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-primary);
    }

    /* 移动端抽屉导航 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: 0;
      width: 280px;
      height: 100vh;
      background: var(--white);
      box-shadow: -4px 0 24px rgba(0,0,0,0.1);
      transform: translateX(100%);
      transition: transform 250ms ease-out;
      z-index: 200;
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .mobile-drawer.open {
      transform: translateX(0);
    }
    .drawer-close {
      align-self: flex-end;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-primary);
    }
    .drawer-links {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .drawer-links a {
      font-size: 1.1rem;
      font-weight: 500;
      color: var(--text-primary);
      padding: 8px 0;
      border-bottom: 1px solid #eee;
    }
    .overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.3);
      z-index: 150;
      display: none;
    }
    .overlay.show {
      display: block;
    }

    /* 区块通用 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 28px;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
    }
    .btn-primary:hover {
      background: #2c4ecf;
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      padding: 11px 27px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition), color var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    /* Hero */
    .hero {
      padding-top: 120px;
      padding-bottom: 80px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .hero-left p {
      color: var(--text-secondary);
      margin-bottom: 32px;
      font-size: 16px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 1;
      position: relative;
    }
    .hero-image-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .hero-image-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .badge-group {
      position: absolute;
      top: 20px;
      right: 20px;
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
    }
    .data-badge {
      background: white;
      border-radius: 8px;
      padding: 8px 16px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
      font-weight: 700;
      color: var(--gold);
      font-size: 0.9rem;
    }

    /* 优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform var(--transition), box-shadow var(--transition);
      text-align: left;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 20px;
      margin-bottom: 8px;
      font-weight: 700;
    }
    .feature-card p {
      color: var(--text-secondary);
      font-size: 14px;
    }

    /* 案例瀑布流 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      background: #eef2ff;
      color: var(--primary);
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    .case-card h3 {
      font-size: 18px;
      margin-bottom: 6px;
    }
    .case-desc {
      color: var(--text-secondary);
      font-size: 14px;
    }
    .case-stat {
      margin-top: 12px;
      font-weight: 700;
      color: var(--gold);
    }

    /* 数据见证 */
    .stats-row {
      display: flex;
      justify-content: center;
      gap: 40px;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 14px;
    }

    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 40px;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .compare-card.recommended {
      border: 1px solid var(--gold);
    }
    .recommend-tag {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--gold);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    .compare-list {
      list-style: none;
      margin-top: 20px;
    }
    .compare-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .compare-list i.fa-check { color: var(--success); }
    .compare-list i.fa-times { color: var(--text-secondary); }

    /* FAQ */
    .faq-container {
      max-width: 800px;
      margin: 40px auto 0;
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 24px;
    }
    .faq-item {
      border-bottom: 1px solid #eee;
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease;
      color: var(--text-secondary);
      font-size: 14px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 8px;
    }
    .faq-icon {
      transition: transform 0.25s;
    }
    .faq-item.open .faq-icon {
      transform: rotate(180deg);
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #3A5FE5 0%, #1E3A8A 100%);
      color: white;
      text-align: center;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      max-width: 600px;
      margin: 32px auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }
    .cta-form input {
      flex: 1 1 200px;
      padding: 12px 16px;
      border-radius: 8px;
      border: none;
      outline: none;
      font-size: 1rem;
    }
    .cta-form input:focus {
      box-shadow: 0 0 0 3px rgba(255,255,255,0.4);
    }

    /* 页脚 */
    .main-footer {
      background: #1F2329;
      color: #86909C;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer-brand p { margin-top: 12px; font-size: 14px; }
    .footer-links h4, .footer-contact h4 {
      color: white;
      margin-bottom: 12px;
    }
    .footer-links a, .footer-contact p {
      display: block;
      margin-bottom: 8px;
      font-size: 14px;
      color: #86909C;
    }
    .footer-bottom {
      border-top: 1px solid #333;
      padding-top: 16px;
      text-align: center;
      font-size: 13px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .features-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .features-grid, .cases-grid, .compare-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-left h1 { font-size: 28px; }
      section { padding: 48px 0; }
      .stats-row { gap: 24px; }
    }
    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
      .hero-buttons { flex-direction: column; align-items: flex-start; }
    }