/* roulang page: index */
:root {
      --primary: #1A6CFF;
      --primary-soft: rgba(26, 108, 255, 0.08);
      --primary-hover: #1558D6;
      --accent: #0FD9A8;
      --accent-soft: rgba(15, 217, 168, 0.08);
      --warning: #FF8A3D;
      --error: #F54E4E;
      --bg: #F7F8FC;
      --surface: #FFFFFF;
      --dark-bg: #111827;
      --text-primary: #0F172A;
      --text-secondary: #1E293B;
      --text-body: #475569;
      --text-muted: #94A3B8;
      --border: #E2E8F0;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-nav: 0 1px 0 rgba(0,0,0,0.03), 0 2px 8px rgba(0,0,0,0.04);
      --shadow-button: 0 6px 16px rgba(26,108,255,0.25);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-pill: 50px;
      --radius-tag: 6px;
      --radius-faq: 12px;
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: all 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }
    h1, h2, h3 {
      letter-spacing: -0.02em;
    }
    .section-title {
      font-size: 24px;
      font-weight: 600;
      color: var(--text-secondary);
      margin-bottom: 12px;
      line-height: 1.3;
    }
    .section-sub {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 40px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 68px;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: var(--transition);
    }
    .navbar.scrolled {
      box-shadow: var(--shadow-nav);
      border-bottom-color: var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text-primary);
      letter-spacing: -0.02em;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2"><circle cx="12" cy="12" r="3"/><path d="M12 2v4m0 12v4M4.93 4.93l2.83 2.83m8.48 8.48l2.83 2.83M2 12h4m12 0h4M4.93 19.07l2.83-2.83m8.48-8.48l2.83-2.83"/></svg>') center/contain no-repeat;
      background: var(--primary);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      transition: var(--transition);
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      font-size: 15px;
      box-shadow: 0 2px 8px rgba(26,108,255,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: var(--shadow-button);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      font-size: 15px;
    }
    .btn-outline:hover {
      background: var(--primary-soft);
    }
    .btn-ghost-light {
      border: 1px solid rgba(255,255,255,0.7);
      color: white;
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      font-weight: 600;
      font-size: 16px;
    }
    .btn-ghost-light:hover {
      background: white;
      color: var(--primary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      transition: var(--transition);
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: white;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-primary);
      line-height: 1.25;
      margin-bottom: 16px;
    }
    .hero-desc {
      font-size: 16px;
      color: var(--text-body);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 380px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.06);
      transition: var(--transition);
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0px); }
    }
    /* 亮点网格 */
    .features {
      padding: 80px 0;
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px rgba(0,0,0,0.06);
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      background: #EEF4FF;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 24px;
    }
    .feature-title {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-secondary);
      margin-bottom: 8px;
    }
    .feature-desc {
      font-size: 15px;
      color: var(--text-body);
      line-height: 1.6;
    }
    /* 案例瀑布 */
    .cases {
      padding: 80px 0;
    }
    .cases-masonry {
      column-count: 3;
      column-gap: 20px;
    }
    .case-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      margin-bottom: 20px;
      break-inside: avoid;
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px rgba(0,0,0,0.06);
    }
    .case-img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 20px;
    }
    .case-tag {
      font-size: 12px;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 8px;
    }
    .case-title {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-secondary);
      margin-bottom: 6px;
    }
    /* 方案对比 */
    .pricing {
      padding: 80px 0;
    }
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .plan-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border);
      transition: var(--transition);
      position: relative;
    }
    .plan-card.recommended {
      border: 2px solid var(--primary);
      transform: scale(1.02);
    }
    .plan-badge {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--accent);
      color: #111;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
    }
    .plan-name {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-secondary);
    }
    .plan-price {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-primary);
      margin: 12px 0 16px;
    }
    .plan-features {
      list-style: none;
      margin-bottom: 24px;
    }
    .plan-features li {
      margin-bottom: 10px;
      font-size: 14px;
      color: var(--text-body);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    /* FAQ */
    .faq {
      padding: 80px 0;
    }
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius-faq);
      padding: 20px 24px;
      box-shadow: var(--shadow-card);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--text-secondary);
      cursor: pointer;
      font-size: 16px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      font-size: 15px;
      line-height: 1.7;
      padding-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(135deg, var(--primary) 0%, #0F3FCC 100%);
      padding: 80px 24px;
      text-align: center;
      color: white;
      border-radius: 32px;
      margin: 80px 0;
    }
    .cta-title {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .cta-desc {
      font-size: 16px;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    /* 页脚 */
    .footer {
      background: white;
      padding: 60px 0 30px;
      border-top: 1px solid var(--border);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-brand {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-primary);
    }
    .footer-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 12px;
    }
    .footer-title {
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-secondary);
    }
    .footer-links li {
      list-style: none;
      margin-bottom: 8px;
      font-size: 14px;
      color: var(--text-body);
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .copyright {
      text-align: center;
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 40px;
      border-top: 1px solid var(--border);
      padding-top: 20px;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cases-masonry {
        column-count: 2;
      }
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .features-grid {
        grid-template-columns: 1fr;
      }
      .cases-masonry {
        column-count: 1;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 28px;
      }
    }