/* roulang page: index */
:root {
      --primary: #2B5AED;
      --primary-hover: #1E4BD8;
      --secondary: #00A86B;
      --accent: #FF8C00;
      --danger: #E53E3E;
      --bg: #F5F6FA;
      --card-white: #FFFFFF;
      --light-bg: #EEF1F9;
      --text-dark: #1A1F36;
      --text-mid: #6B7280;
      --text-light: #9CA3AF;
      --border-light: #E5E7EB;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-tag: 4px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.02);
      --shadow-hover: 0 4px 16px rgba(43,90,237,0.08), 0 8px 24px rgba(0,0,0,0.04);
      --transition: 150ms ease;
      --max-width: 1200px;
      --header-height: 72px;
    }

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      font-size: 16px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
    }

    .btn-primary {
      background-color: var(--primary);
      color: white;
      box-shadow: 0 2px 8px rgba(43,90,237,0.2);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(43,90,237,0.25);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }
    .btn-secondary:hover {
      background-color: #F0F4FF;
      transform: translateY(-1px);
    }

    .btn-text {
      padding: 8px 4px;
      color: var(--primary);
      font-weight: 500;
    }
    .btn-text:hover {
      text-decoration: underline;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: white;
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      transition: box-shadow 0.2s;
    }
    .main-header.scrolled {
      box-shadow: 0 1px 6px rgba(0,0,0,0.04);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 20px;
      color: var(--text-dark);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><circle cx="12" cy="9" r="4" fill="black"/><ellipse cx="12" cy="17" rx="5" ry="3" fill="black"/><path d="M8 14 Q12 8 16 14" stroke="black" stroke-width="2" fill="none"/></svg>') center/contain no-repeat;
      background-color: var(--primary);
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      list-style: none;
      align-items: center;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-mid);
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--text-dark);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary);
      transition: width 0.2s;
      border-radius: 2px;
    }
    .nav-menu a:hover::after, .nav-menu a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-dark);
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      padding: 24px;
      box-shadow: var(--shadow-sm);
      flex-direction: column;
      gap: 20px;
    }
    .mobile-menu a {
      font-size: 20px;
      font-weight: 500;
      color: var(--text-dark);
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: white;
      margin-top: 72px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 60px;
      align-items: center;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-dark);
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-mid);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .trust-stats {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }
    .stat-item strong {
      font-size: 24px;
      color: var(--primary);
      display: block;
      font-weight: 700;
    }
    .stat-item span {
      font-size: 14px;
      color: var(--text-mid);
    }
    .hero-image {
      border-radius: 24px 8px 24px 8px;
      overflow: hidden;
      box-shadow: 0 12px 24px rgba(0,0,0,0.06);
      transform: rotate(1deg);
      background: #f0f2f5;
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    /* 亮点网格 */
    .highlights {
      padding: 120px 0;
    }
    .grid-3-unequal {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .highlight-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .highlight-card.large {
      background: var(--light-bg);
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 12px;
      background: white;
      color: var(--primary);
      margin-bottom: 24px;
      font-size: 24px;
    }
    .highlight-title {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .highlight-desc {
      color: var(--text-mid);
      font-size: 15px;
    }

    /* 案例瀑布流 */
    .cases {
      padding: 0 0 120px;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-mid);
      margin-bottom: 48px;
      font-size: 18px;
    }
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      break-inside: avoid;
      transition: 0.2s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      overflow: hidden;
      height: 200px;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.2s;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      background: #f0f2f5;
      color: var(--text-mid);
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    .case-title {
      font-weight: 600;
      font-size: 18px;
      margin-bottom: 8px;
    }
    .case-desc {
      font-size: 14px;
      color: var(--text-mid);
    }

    /* 方案对比 */
    .pricing {
      background: var(--light-bg);
      padding: 100px 0;
    }
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .plan-card {
      background: white;
      border-radius: 20px;
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      border: 2px solid transparent;
      transition: 0.2s;
      display: flex;
      flex-direction: column;
    }
    .plan-card.recommended {
      border-color: var(--primary);
      position: relative;
    }
    .badge {
      background: var(--accent);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      position: absolute;
      top: -14px;
      left: 28px;
    }
    .plan-name {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .plan-price {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 24px;
    }
    .plan-price small {
      font-size: 16px;
      font-weight: 400;
      color: var(--text-mid);
    }
    .feature-list {
      list-style: none;
      margin-bottom: 32px;
      flex: 1;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 15px;
      margin-bottom: 14px;
      color: var(--text-mid);
    }
    .check {
      color: var(--secondary);
      font-weight: bold;
    }
    .cross {
      color: var(--danger);
    }

    /* FAQ */
    .faq {
      padding: 120px 0;
      background: white;
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: 60px;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      cursor: pointer;
    }
    .accordion-header {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-mid);
      font-size: 16px;
    }
    .accordion-content.open {
      max-height: 200px;
      padding-top: 12px;
    }

    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #F0F4FF 0%, #E8EEFD 100%);
      padding: 80px 0;
      text-align: center;
    }
    .trust-logos {
      display: flex;
      justify-content: center;
      gap: 40px;
      margin-top: 32px;
      opacity: 0.7;
      filter: grayscale(0.5);
    }

    /* 页脚 */
    .footer {
      background: #1A1F36;
      color: #D1D5DB;
      padding: 64px 0 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 16px;
      font-size: 16px;
    }
    .footer a {
      color: #9CA3AF;
      font-size: 14px;
      display: block;
      margin-bottom: 10px;
    }
    .copyright {
      border-top: 1px solid #2D3143;
      margin-top: 48px;
      padding: 20px 0;
      text-align: center;
      font-size: 14px;
      color: #9CA3AF;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .grid-3-unequal { grid-template-columns: 1fr 1fr; }
      .masonry { columns: 2; }
      .pricing-grid { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-title { font-size: 36px; }
      .grid-3-unequal { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-image { transform: none; }
    }