/* roulang page: index */
:root {
      --primary: #E8380D;
      --primary-dark: #C42D0A;
      --secondary: #1A1A2E;
      --accent-gold: #F0A500;
      --bg: #F5F6FA;
      --card-bg: #FFFFFF;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --text-on-dark: #FFFFFF;
      --text-on-dark-muted: #B0B8C1;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --border-light: #E5E8EF;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 6px 20px rgba(0,0,0,0.10);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-xs: 8px;
      --max-width: 1200px;
      --space-section: 88px;
    }

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

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

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

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

    button, input {
      font-family: inherit;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      box-shadow: 0 1px 0 0 var(--border-light);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo-area {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .logo-text {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }

    .logo-domain {
      font-size: 12px;
      color: var(--text-secondary);
      font-weight: 400;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-menu a {
      font-size: 16px;
      color: var(--text-primary);
      font-weight: 500;
      transition: color 0.2s;
      white-space: nowrap;
    }

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

    .nav-cta {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-sm);
      padding: 10px 24px;
      font-weight: 600;
      transition: background 0.2s;
      border: none;
      cursor: pointer;
      font-size: 16px;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: var(--primary-dark);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
      z-index: 1020;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--text-primary);
      display: block;
      transition: all 0.25s;
    }

    .mobile-menu-overlay {
      position: fixed;
      top: 0;
      right: 0;
      width: 100%;
      height: 100vh;
      background: #FFFFFF;
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }

    .mobile-menu-overlay.active {
      transform: translateX(0);
    }

    .mobile-menu-overlay a {
      font-size: 20px;
      color: var(--text-primary);
      font-weight: 500;
    }

    .mobile-menu-overlay .close-btn {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 32px;
      background: none;
      border: none;
      cursor: pointer;
      color: var(--text-primary);
    }

    /* 板块通用 */
    section {
      padding: var(--space-section) 0;
    }

    h2 {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
    }

    /* Hero */
    .hero {
      padding-top: 120px;
      padding-bottom: 80px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      justify-content: space-between;
    }

    .hero-left {
      flex: 1;
    }

    .hero-left h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-primary);
      margin-bottom: 16px;
    }

    .hero-left .subtitle {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 18px;
      border: none;
      cursor: pointer;
      transition: background 0.2s;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 18px;
      border: 2px solid var(--primary);
      cursor: pointer;
      transition: all 0.2s;
    }

    .btn-outline:hover {
      background: rgba(232,56,13,0.05);
    }

    .hero-right-dashboard {
      background-color: var(--secondary);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
      justify-content: center;
      flex: 1;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
    }

    .metric-item {
      text-align: center;
      color: white;
    }

    .metric-number {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.1;
      color: var(--accent-gold);
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-on-dark-muted);
      margin-top: 8px;
    }

    /* 核心优势 */
    .features {
      background: transparent;
    }

    .metrics-row {
      display: flex;
      justify-content: space-between;
      gap: 32px;
      text-align: center;
      flex-wrap: wrap;
    }

    .metrics-item {
      flex: 1;
      min-width: 140px;
    }

    .metrics-item .big-number {
      font-size: 40px;
      font-weight: 800;
      color: var(--accent-gold);
      line-height: 1.2;
    }

    .metrics-item .desc {
      font-size: 16px;
      font-weight: 600;
      margin: 8px 0 4px;
    }

    .metrics-item .sub {
      color: var(--text-secondary);
      font-size: 14px;
    }

    /* 服务矩阵 */
    .services {
      background: transparent;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .service-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
      gap: 16px;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      position: relative;
      overflow: hidden;
    }

    .service-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(255,255,255,0.92);
      z-index: 0;
    }

    .service-card > * {
      position: relative;
      z-index: 1;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    .service-icon {
      font-size: 40px;
      color: var(--primary);
      line-height: 1;
    }

    .service-card h3 {
      color: var(--text-primary);
    }

    .service-card p {
      color: var(--text-secondary);
      font-size: 14px;
    }

    /* 结果对比 */
    .compare-grid {
      display: flex;
      gap: 32px;
    }

    .compare-col {
      flex: 1;
      padding: 32px;
      border-radius: var(--radius-md);
    }

    .compare-col.bad {
      background: #f0f2f5;
      color: var(--text-secondary);
    }

    .compare-col.good {
      background: white;
      border-left: 6px solid var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: none;
      margin-bottom: 8px;
    }

    .faq-question {
      background: white;
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-radius: var(--radius-sm);
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
      transition: background 0.2s;
    }

    .faq-question:hover {
      background: #f5f6fa;
    }

    .faq-answer {
      background: #FAFBFC;
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-secondary);
      font-size: 14px;
      border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    }

    .faq-item.open .faq-answer {
      padding: 20px 24px;
      max-height: 200px;
    }

    /* CTA */
    .cta-section {
      background: var(--secondary);
      color: white;
    }

    .cta-inner {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .cta-form {
      display: flex;
      gap: 16px;
      margin-top: 32px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .cta-form input {
      padding: 14px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
      background: white;
      font-size: 16px;
      width: 220px;
      transition: 0.2s;
    }

    .cta-form input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(232,56,13,0.2);
    }

    .privacy-note {
      font-size: 12px;
      color: var(--text-on-dark-muted);
      margin-top: 12px;
    }

    /* 页脚 */
    .footer {
      background: #1F2329;
      color: var(--text-secondary);
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

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

    .footer a {
      color: var(--text-secondary);
      transition: color 0.2s;
      display: block;
      margin-bottom: 8px;
    }

    .footer a:hover {
      color: white;
    }

    .copyright {
      margin-top: 32px;
      border-top: 1px solid #2a2f38;
      padding-top: 16px;
      font-size: 14px;
      text-align: center;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .compare-grid {
        flex-direction: column;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .metrics-row {
        justify-content: center;
        gap: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-right-dashboard {
        width: 100%;
      }
      h1 {
        font-size: 36px !important;
      }
    }

    @media (max-width: 520px) {
      .container {
        padding: 0 16px;
      }
    }