/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --accent: #0284C7;
      --status-green: #10B981;
      --bg: #F8FAFC;
      --surface: #FFFFFF;
      --surface-dark: #0F172A;
      --surface-dark-card: #1E293B;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-light: #64748B;
      --border: #E2E8F0;
      --border-dark: #334155;
      --gold-accent: #D97706;
      --shadow-sm: 0 2px 6px -1px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
      --shadow-hover: 0 16px 32px -4px rgba(30, 64, 175, 0.12);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 16px;
    }

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

    body {
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg);
      color: var(--text-muted);
      line-height: 1.65;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

    .container {
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部双行导航 */
    .top-bar {
      background: #0B1120;
      color: #94A3B8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .pulse-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--status-green);
      border-radius: 50%;
      margin-right: 6px;
      box-shadow: 0 0 8px var(--status-green);
    }

    .main-nav-wrapper {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      height: 72px;
      display: flex;
      align-items: center;
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .brand-logo {
      font-size: 22px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-badge {
      font-size: 11px;
      background: #EFF6FF;
      color: var(--primary);
      padding: 2px 8px;
      border-radius: 4px;
      font-weight: 600;
      border: 1px solid #DBEAFE;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-cta-btn {
      background: var(--primary);
      color: #fff;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      box-shadow: 0 4px 12px rgba(30, 64, 175, 0.25);
    }
    .nav-cta-btn:hover {
      background: var(--primary-hover);
      color: #fff;
      transform: translateY(-1px);
    }

    /* 板块通用间距与标题 */
    section {
      padding: 96px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.center {
      text-align: center;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--accent);
      background: #E0F2FE;
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 1. Hero 蓝图：黑金会员俱乐部感质感 */
    .hero-club-section {
      background: linear-gradient(135deg, #090D16 0%, #111827 50%, #0F172A 100%);
      color: #F8FAFC;
      padding: 110px 0 90px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      position: relative;
      overflow: hidden;
    }
    .hero-club-section::before {
      content: '';
      position: absolute;
      top: 0; right: 0; bottom: 0; left: 0;
      background: url('/assets/images/c51a9ebbb13ca449.webp') center/cover no-repeat;
      opacity: 0.12;
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-badge-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 24px;
    }
    .vip-tier-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(90deg, #F59E0B, #D97706);
      color: #000;
      font-weight: 800;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 4px;
      letter-spacing: 0.5px;
    }
    .vip-tier-sub {
      color: #94A3B8;
      font-size: 13px;
    }
    .hero-h1 {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-desc {
      font-size: 16px;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 36px;
      max-width: 620px;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-gold {
      background: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
      color: #000000;
      font-weight: 700;
      padding: 14px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      transition: all 0.2s ease;
      box-shadow: 0 4px 18px rgba(245, 158, 11, 0.35);
    }
    .btn-gold:hover {
      background: linear-gradient(135deg, #FBBF24 0%, #F59E0B 100%);
      transform: translateY(-2px);
    }
    .btn-outline-light {
      border: 1px solid rgba(255, 255, 255, 0.25);
      color: #FFFFFF;
      font-weight: 600;
      padding: 14px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      transition: all 0.2s ease;
      background: rgba(255, 255, 255, 0.04);
    }
    .btn-outline-light:hover {
      background: rgba(255, 255, 255, 0.12);
      border-color: #FFFFFF;
    }

    /* 首屏右侧专属控制台预览卡 */
    .vip-terminal-card {
      background: rgba(15, 23, 42, 0.85);
      border: 1px solid rgba(245, 158, 11, 0.3);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45);
      backdrop-filter: blur(10px);
    }
    .terminal-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding-bottom: 12px;
      margin-bottom: 16px;
    }
    .terminal-title {
      font-size: 13px;
      font-weight: 600;
      color: #F59E0B;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .terminal-feed {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-size: 13px;
      line-height: 1.6;
      color: #38BDF8;
      background: #020617;
      padding: 16px;
      border-radius: var(--radius-sm);
      border: 1px solid #1E293B;
      overflow-x: auto;
    }
    .feed-key { color: #A5B4FC; }
    .feed-val { color: #34D399; }
    .feed-str { color: #FDE047; }

    /* 2. 客户案例板块 (#solutions) */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #BFDBFE;
    }
    .case-img-wrap {
      height: 200px;
      overflow: hidden;
      background: #E2E8F0;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }
    .case-content {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .case-tag {
      font-size: 12px;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 8px;
    }
    .case-h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .case-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex: 1;
    }
    .case-meta {
      border-top: 1px solid var(--border);
      padding-top: 12px;
      font-size: 13px;
      color: var(--text-light);
      display: flex;
      justify-content: space-between;
    }

    /* 3. 结果数据条 (#metrics) */
    .metrics-bar-section {
      background: #EFF6FF;
      border-top: 1px solid #DBEAFE;
      border-bottom: 1px solid #DBEAFE;
      padding: 64px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .metric-item {
      padding: 0 16px;
    }
    .metric-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--primary);
      font-family: ui-monospace, SFMono-Regular, monospace;
      letter-spacing: -1px;
      margin-bottom: 8px;
    }
    .metric-label {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .metric-note {
      font-size: 13px;
      color: var(--text-light);
    }

    /* 4. 前后对比板块 (#comparison) */
    .comparison-section {
      background: var(--surface);
    }
    .comparison-table-wrapper {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .comparison-table th, .comparison-table td {
      padding: 20px 24px;
      border-bottom: 1px solid var(--border);
      font-size: 15px;
    }
    .comparison-table th {
      background: #F8FAFC;
      color: var(--text-main);
      font-weight: 700;
    }
    .comparison-table tr:last-child td {
      border-bottom: none;
    }
    .col-highlight {
      background: #F0FDF4;
      font-weight: 600;
      color: #065F46;
    }
    .status-badge-good {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      color: #059669;
      font-weight: 700;
    }
    .status-badge-bad {
      color: #94A3B8;
      text-decoration: line-through;
    }

    /* 5. 核心资质与参数认证 (#credentials) */
    .cred-section {
      background: #F1F5F9;
      padding: 60px 0;
    }
    .cred-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .cred-card {
      background: #FFFFFF;
      padding: 24px;
      border-radius: var(--radius-sm);
      border-left: 4px solid var(--accent);
      box-shadow: var(--shadow-sm);
    }
    .cred-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .cred-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 6. 方法说明/服务架构解构 (#overview) */
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .lifecycle-steps {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .lifecycle-step {
      display: flex;
      gap: 16px;
      background: #FFFFFF;
      padding: 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
    }
    .step-number {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }
    .step-info h4 {
      font-size: 16px;
      color: var(--text-main);
      margin-bottom: 6px;
      font-weight: 700;
    }
    .step-info p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 7. 优势矩阵 3x2 网格 (#features) */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      transition: all 0.25s ease;
      box-shadow: var(--shadow-sm);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #BFDBFE;
    }
    .feature-icon-box {
      width: 48px;
      height: 48px;
      background: #EFF6FF;
      color: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 20px;
      border: 1px solid #DBEAFE;
    }
    .feature-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .feature-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 8. 热门产品系列卡片 (#products) */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .product-img-box {
      height: 180px;
      overflow: hidden;
    }
    .product-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .product-body {
      padding: 28px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .product-body h3 {
      font-size: 20px;
      color: var(--text-main);
      margin-bottom: 12px;
      font-weight: 700;
    }
    .product-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }
    .product-field-list {
      list-style: none;
      background: #F8FAFC;
      padding: 16px;
      border-radius: var(--radius-sm);
      margin-bottom: 20px;
      font-size: 13px;
      color: var(--text-muted);
      flex: 1;
    }
    .product-field-list li {
      padding: 4px 0;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .product-field-list li::before {
      content: "•";
      color: var(--accent);
      font-weight: bold;
    }

    /* 9. 深色底座架构区 (#architecture) */
    .dark-arch-section {
      background: var(--surface-dark);
      color: #F8FAFC;
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
    }
    .arch-card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .arch-card {
      background: var(--surface-dark-card);
      padding: 32px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-dark);
    }
    .arch-icon {
      color: var(--accent);
      font-size: 28px;
      margin-bottom: 20px;
    }
    .arch-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .arch-desc {
      font-size: 14px;
      color: #94A3B8;
      line-height: 1.6;
    }

    /* 10. 资讯区 (#news) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.2s;
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .news-date {
      font-size: 13px;
      color: var(--text-light);
      margin-bottom: 12px;
    }
    .news-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.4;
    }

    /* 11. FAQ (#faq) */
    .faq-item {
      margin-bottom: 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      overflow: hidden;
    }
    .faq-q {
      padding: 20px;
      font-weight: 700;
      color: var(--text-main);
      background: #FAFAFA;
      cursor: pointer;
    }
    .faq-a {
      padding: 20px;
      color: var(--text-muted);
      border-top: 1px solid var(--border);
      font-size: 15px;
    }

    /* 12. 底部转化条 (#cta) */
    .cta-banner {
      background: var(--primary);
      color: #FFFFFF;
      padding: 64px 0;
      text-align: center;
      border-radius: var(--radius-lg);
      margin: 80px 0;
    }
    .cta-h2 {
      font-size: 36px;
      margin-bottom: 24px;
    }
    .cta-input-group {
      max-width: 500px;
      margin: 0 auto;
      display: flex;
      gap: 12px;
      background: #FFFFFF;
      padding: 8px;
      border-radius: var(--radius-sm);
    }
    .cta-input-group input {
      flex: 1;
      border: none;
      padding: 0 16px;
      font-size: 16px;
      outline: none;
    }
    .cta-btn {
      background: var(--accent);
      color: #fff;
      padding: 12px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      border: none;
      cursor: pointer;
    }

    /* 页脚 */
    footer {
      background: #0B1120;
      color: #64748B;
      padding: 64px 0 32px;
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 48px;
      margin-bottom: 48px;
    }
    .footer-h4 {
      color: #FFFFFF;
      margin-bottom: 20px;
      font-size: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .bottom-bar {
      border-top: 1px solid #1E293B;
      padding-top: 32px;
      text-align: center;
    }