/* roulang page: index */
:root {
      --color-primary: #0B1A2E;
      --color-secondary: #3B6FA0;
      --color-accent: #2DD4BF;
      --color-bg-alt: #F7F9FC;
      --color-text: #1A1A2E;
      --color-text-secondary: #5A6A7E;
      --color-text-muted: #8E9DAE;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(11,26,46,0.06);
      --shadow-hover: 0 8px 24px rgba(11,26,46,0.12);
      --font-sans: "Inter", "SF Pro Display", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
      --transition-base: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: #FFFFFF;
      color: var(--color-text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      color: var(--color-text);
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 20px;
      line-height: 1.4;
    }

    a {
      text-decoration: none;
      color: var(--color-secondary);
      transition: var(--transition-base);
    }

    a:hover {
      color: var(--color-primary);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-size: 15px;
      transition: var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 1.5px solid transparent;
    }

    .btn-primary {
      background-color: var(--color-primary);
      color: white;
      border-color: var(--color-primary);
    }

    .btn-primary:hover {
      background-color: #0A1525;
      transform: translateY(-1px);
      box-shadow: var(--shadow-hover);
    }

    .btn-secondary {
      background: transparent;
      color: var(--color-primary);
      border-color: var(--color-secondary);
    }

    .btn-secondary:hover {
      background-color: rgba(59, 111, 160, 0.05);
      border-color: var(--color-primary);
    }

    .btn-accent {
      background-color: var(--color-accent);
      color: var(--color-primary);
      font-weight: 700;
      border: none;
    }

    .btn-accent:hover {
      filter: brightness(1.1);
      transform: translateY(-1px);
      box-shadow: var(--shadow-hover);
    }

    .btn-white {
      background: white;
      color: var(--color-primary);
    }

    .btn-white-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
    }

    .btn-white-outline:hover {
      background: rgba(255,255,255,0.1);
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: white;
      z-index: 1000;
      border-bottom: 1px solid rgba(0,0,0,0.05);
      display: flex;
      align-items: center;
      backdrop-filter: blur(6px);
      background: rgba(255,255,255,0.92);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--color-primary);
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--color-primary);
      mask: url('/assets/images/backpic/logo-icon.svg') center/contain no-repeat;
      background-color: var(--color-secondary);
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      font-size: 15px;
      font-weight: 500;
    }

    .nav-links a {
      color: var(--color-text-secondary);
    }

    .nav-links a:hover {
      color: var(--color-primary);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon, .login-link {
      color: var(--color-text-secondary);
      font-size: 16px;
      background: none;
      border: none;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--color-primary);
      cursor: pointer;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      height: calc(100vh - 64px);
      background: var(--color-primary);
      flex-direction: column;
      padding: 40px;
      gap: 24px;
      z-index: 999;
    }

    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 12px;
    }

    .mobile-menu.active {
      display: flex;
    }

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: white;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 60px;
      align-items: center;
    }

    .hero-text h1 {
      margin-bottom: 20px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--color-text-secondary);
      margin-bottom: 32px;
      max-width: 90%;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-visual {
      background: #F0F4FA;
      border-radius: 24px;
      aspect-ratio: 4 / 3;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      box-shadow: var(--shadow-card);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .hero-visual::after {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(45,212,191,0.08) 0%, transparent 60%);
    }

    /* 亮点网格 */
    .features {
      padding: 80px 0;
      background: var(--color-bg-alt);
    }

    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 0;
      margin-top: 48px;
    }

    .feature-item {
      padding: 32px 40px 32px 0;
      border-bottom: 1px solid rgba(0,0,0,0.06);
    }

    .feature-item:last-child {
      border-bottom: none;
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      background: var(--color-secondary);
      mask: url('/assets/images/backpic/icon-advantage-1.svg') center/contain no-repeat;
      background-color: var(--color-secondary);
      margin-bottom: 20px;
    }

    .feature-item h3 {
      margin-bottom: 12px;
    }

    .feature-item p {
      color: var(--color-text-secondary);
      font-size: 15px;
    }

    /* 案例瀑布流 */
    .cases {
      padding: 80px 0;
      background: white;
    }

    .masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 48px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition-base);
      display: flex;
      flex-direction: column;
    }

    .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border: 1px solid var(--color-secondary);
    }

    .case-img {
      aspect-ratio: 4/3;
      background: #e9edf2;
      overflow: hidden;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img img {
      transform: scale(1.03);
    }

    .case-content {
      padding: 20px;
    }

    .case-tags {
      display: flex;
      gap: 8px;
      margin: 12px 0;
    }

    .tag {
      background: rgba(45,212,191,0.15);
      color: #0B1A2E;
      font-size: 12px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 20px;
    }

    .case-title {
      font-weight: 700;
      font-size: 18px;
      margin: 8px 0;
    }

    .case-desc {
      color: var(--color-text-secondary);
      font-size: 14px;
    }

    /* 方案对比表 */
    .pricing {
      padding: 80px 0;
      background: var(--color-bg-alt);
    }

    .table-wrapper {
      overflow-x: auto;
      margin-top: 40px;
      border-radius: 16px;
      box-shadow: var(--shadow-card);
    }

    .compare-table {
      width: 100%;
      min-width: 600px;
      border-collapse: collapse;
      background: white;
    }

    .compare-table th {
      background: var(--color-primary);
      color: white;
      font-weight: 600;
      padding: 20px 16px;
      text-align: left;
    }

    .compare-table td {
      padding: 18px 16px;
      border-bottom: 1px solid #edf2f7;
      color: var(--color-text-secondary);
    }

    .recommended-col {
      background: rgba(45,212,191,0.08);
    }

    .badge-recommend {
      background: var(--color-accent);
      color: var(--color-primary);
      font-size: 12px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
      margin-left: 8px;
    }

    .inline-cta {
      margin-top: 24px;
      text-align: center;
    }

    /* FAQ */
    .faq {
      padding: 80px 0;
      background: white;
    }

    .faq-list {
      max-width: 720px;
      margin: 40px auto 0;
    }

    .faq-item {
      background: #F7F9FC;
      border-radius: 8px;
      margin-bottom: 8px;
      transition: 0.3s ease;
    }

    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      align-items: center;
      cursor: pointer;
      border-left: 3px solid transparent;
    }

    .faq-item.active {
      background: white;
      border-left: 3px solid var(--color-secondary);
    }

    .faq-icon {
      margin-right: 12px;
      font-weight: 700;
      color: var(--color-secondary);
    }

    .faq-answer {
      padding: 0 20px 20px;
      color: var(--color-text-secondary);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0B1A2E 0%, #3B6FA0 100%);
      padding: 80px 0;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .cta-banner::before {
      content: "";
      position: absolute;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%);
      top: -100px;
      right: -100px;
      border-radius: 50%;
    }

    .cta-content h2 {
      color: white;
      margin-bottom: 16px;
    }

    .cta-content p {
      color: rgba(255,255,255,0.7);
      max-width: 600px;
      margin: 0 auto 32px;
    }

    .cta-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    /* 页脚 */
    .footer {
      background: #0B1A2E;
      color: white;
      padding: 60px 0 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
      gap: 40px;
      padding-bottom: 40px;
    }

    .footer-logo {
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 16px;
      color: white;
    }

    .footer-desc {
      color: rgba(255,255,255,0.7);
      font-size: 14px;
    }

    .social-icons {
      display: flex;
      gap: 12px;
      margin-top: 20px;
    }

    .social-circle {
      width: 36px;
      height: 36px;
      background: rgba(255,255,255,0.15);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
    }

    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
    }

    .footer-col a {
      display: block;
      color: rgba(255,255,255,0.7);
      margin-bottom: 12px;
      font-size: 14px;
    }

    .copyright {
      background: #091320;
      text-align: center;
      padding: 20px 0;
      color: rgba(255,255,255,0.6);
      font-size: 13px;
    }

    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero-grid { grid-template-columns: 1fr; gap: 40px; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .masonry { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      .nav-links, .header-actions .search-icon, .login-link { display: none; }
      .hamburger { display: block; }
      .features-grid, .masonry { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }