/* roulang page: index */
:root {
      --bg-dark: #0A0D14;
      --bg-deep: #05070B;
      --bg-light: #F8F9FC;
      --bg-white: #FFFFFF;
      --accent: #00E599;
      --accent-glow: rgba(0, 229, 153, 0.25);
      --secondary: #5E6AD2;
      --text-main: #111827;
      --text-muted: #4B5563;
      --text-light: #9CA3AF;
      --text-inverse: #F3F4F6;
      --border-light: #E5E7EB;
      --border-dark: rgba(255, 255, 255, 0.08);
      --card-bg: #FFFFFF;
      --card-bg-dark: #0F1420;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --font-stack: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --font-mono: "JetBrains Mono", "SF Pro Display", Menlo, monospace;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      overflow-x: hidden;
    }

    body {
      font-family: var(--font-stack);
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, input, select, textarea {
      font-family: inherit;
      outline: none;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部双行导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 13, 20, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-dark);
      width: 100%;
    }

    .header-top-bar {
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 12px;
      color: var(--text-light);
      padding: 6px 0;
    }

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

    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 8px var(--accent);
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.95); opacity: 0.8; }
      50% { transform: scale(1.15); opacity: 1; }
      100% { transform: scale(0.95); opacity: 0.8; }
    }

    .header-main-bar {
      padding: 14px 0;
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      color: #FFFFFF;
      font-weight: 800;
      font-size: 1.25rem;
      letter-spacing: -0.5px;
    }

    .logo-symbol {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--accent) 0%, var(--secondary) 100%);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #05070B;
      font-weight: 900;
      font-size: 16px;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
    }

    .nav-link-item a {
      color: #D1D5DB;
      font-size: 0.9375rem;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
    }

    .nav-link-item a:hover {
      color: var(--accent);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 0.9375rem;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--accent);
      color: #05070B;
      box-shadow: 0 0 20px rgba(0, 229, 153, 0.3);
    }

    .btn-primary:hover {
      background: #05f3a5;
      transform: translateY(-2px);
      box-shadow: 0 4px 24px rgba(0, 229, 153, 0.45);
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.08);
      color: #FFFFFF;
      border-color: rgba(255, 255, 255, 0.15);
    }

    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.16);
      border-color: rgba(255, 255, 255, 0.3);
      transform: translateY(-2px);
    }

    .btn-outline-dark {
      background: transparent;
      color: var(--text-main);
      border-color: var(--border-light);
    }

    .btn-outline-dark:hover {
      background: #F3F4F6;
      border-color: #D1D5DB;
    }

    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: #FFFFFF;
    }

    .menu-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background: #FFFFFF;
      margin: 5px 0;
      transition: all 0.2s ease;
    }

    /* 通用板块与排版 */
    section {
      padding: 84px 0;
      position: relative;
    }

    .section-head {
      margin-bottom: 50px;
    }

    .section-head-center {
      text-align: center;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
      margin-bottom: 54px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      padding: 4px 12px;
      border-radius: 20px;
      background: rgba(0, 229, 153, 0.1);
      color: #00875A;
      margin-bottom: 12px;
    }

    .section-tag-dark {
      background: rgba(0, 229, 153, 0.15);
      color: var(--accent);
    }

    .section-title {
      font-size: 2.25rem;
      line-height: 1.25;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块 1: Hero (试用申请专属蓝图) */
    .hero-section {
      background-color: var(--bg-dark);
      background-image: linear-gradient(180deg, rgba(10, 13, 20, 0.8) 0%, #0A0D14 100%), url('/assets/images/4e62df2b02310874.png');
      background-size: cover;
      background-position: center;
      padding: 96px 0 100px;
      color: #FFFFFF;
      border-bottom: 1px solid var(--border-dark);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.18;
      letter-spacing: -0.03em;
      margin-bottom: 20px;
      color: #FFFFFF;
    }

    .hero-content h1 span {
      background: linear-gradient(90deg, #FFFFFF 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-lead {
      font-size: 1.0625rem;
      color: #9CA3AF;
      line-height: 1.8;
      margin-bottom: 30px;
    }

    .hero-meta-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 32px;
    }

    .hero-meta-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8125rem;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-dark);
      padding: 6px 14px;
      border-radius: 4px;
      color: #E5E7EB;
    }

    .hero-apply-box {
      background: #111624;
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
      position: relative;
    }

    .apply-box-header {
      border-bottom: 1px solid var(--border-dark);
      padding-bottom: 16px;
      margin-bottom: 20px;
    }

    .apply-box-header h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 6px;
    }

    .apply-box-header p {
      font-size: 0.875rem;
      color: var(--text-light);
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group label {
      display: block;
      font-size: 0.8125rem;
      font-weight: 600;
      color: #D1D5DB;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      background: #090C13;
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-sm);
      padding: 11px 14px;
      color: #FFFFFF;
      font-size: 0.875rem;
      transition: all 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 2px var(--accent-glow);
    }

    .form-help {
      font-size: 0.75rem;
      color: #6B7280;
      margin-top: 5px;
    }

    /* 板块 2: 安全主张 */
    .sec-security {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
    }

    .security-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .security-card {
      background: #F8F9FC;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      transition: all 0.25s ease;
    }

    .security-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #D1D5DB;
    }

    .security-card-icon {
      width: 44px;
      height: 44px;
      background: rgba(0, 229, 153, 0.15);
      color: #00875A;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.125rem;
      margin-bottom: 18px;
      font-family: var(--font-mono);
    }

    .security-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .security-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 3: 检查项 (Checklist) */
    .sec-checklist {
      background: #F3F4F6;
    }

    .check-list-wrap {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .check-item {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px 28px;
      display: flex;
      gap: 18px;
      align-items: flex-start;
      transition: all 0.2s ease;
    }

    .check-item:hover {
      border-color: var(--secondary);
      box-shadow: var(--shadow-sm);
    }

    .check-badge {
      background: #ECFDF5;
      color: #059669;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 14px;
      flex-shrink: 0;
    }

    .check-body h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .check-body p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 4: 合规徽章 (Compliance Badges) */
    .sec-compliance {
      background: #FFFFFF;
      border-top: 1px solid var(--border-light);
      border-bottom: 1px solid var(--border-light);
    }

    .badges-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .badge-card {
      border: 1px dashed #CBD5E1;
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      background: #FAFAFA;
      transition: all 0.2s ease;
    }

    .badge-card:hover {
      border-color: var(--accent);
      background: #FFFFFF;
      box-shadow: var(--shadow-sm);
    }

    .badge-code {
      font-family: var(--font-mono);
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 8px;
    }

    .badge-name {
      font-size: 0.9375rem;
      font-weight: 600;
      margin-bottom: 6px;
    }

    .badge-desc {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 板块 5: 边界说明 (Scope & Limits) */
    .sec-boundaries {
      background: #0A0D14;
      color: #FFFFFF;
    }

    .boundaries-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .boundary-box {
      background: #111624;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 32px;
    }

    .boundary-box.box-allow {
      border-top: 3px solid var(--accent);
    }

    .boundary-box.box-deny {
      border-top: 3px solid #EF4444;
    }

    .boundary-box h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 18px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .boundary-list {
      list-style: none;
    }

    .boundary-list li {
      position: relative;
      padding-left: 24px;
      margin-bottom: 14px;
      font-size: 0.9375rem;
      color: #D1D5DB;
      line-height: 1.6;
    }

    .boundary-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 8px;
      width: 8px;
      height: 8px;
      border-radius: 50%;
    }

    .box-allow .boundary-list li::before {
      background: var(--accent);
    }

    .box-deny .boundary-list li::before {
      background: #EF4444;
    }

    /* 板块 6: 算法矩阵 (Feature Matrix) */
    .sec-matrix {
      background: #F8F9FC;
    }

    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .matrix-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

    .matrix-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 229, 153, 0.4);
    }

    .matrix-num {
      font-family: var(--font-mono);
      font-size: 0.8125rem;
      color: var(--secondary);
      font-weight: 700;
      margin-bottom: 12px;
      display: inline-block;
    }

    .matrix-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .matrix-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 板块 7: 专用场景套件 (Products) */
    .sec-products {
      background: #FFFFFF;
      border-top: 1px solid var(--border-light);
    }

    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .product-card {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: #FFFFFF;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: all 0.25s ease;
    }

    .product-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .product-badge-flag {
      position: absolute;
      top: 16px;
      right: 16px;
      background: #00E599;
      color: #05070B;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: 4px;
      z-index: 2;
    }

    .product-img-box {
      height: 180px;
      overflow: hidden;
      background: #E5E7EB;
    }

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

    .product-card:hover .product-img-box img {
      transform: scale(1.05);
    }

    .product-body {
      padding: 26px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .product-body h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .product-body p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      flex: 1;
    }

    .product-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-bottom: 24px;
    }

    .product-tags span {
      font-size: 0.75rem;
      background: #F3F4F6;
      color: #4B5563;
      padding: 4px 10px;
      border-radius: 4px;
      font-weight: 500;
    }

    /* 板块 8: 沉浸式实战推演 (Case Study) */
    .sec-casestudy {
      background: var(--bg-deep);
      color: #FFFFFF;
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
    }

    .case-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .case-left h2 {
      font-size: 2.2rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 16px;
    }

    .case-left p {
      font-size: 1rem;
      color: #9CA3AF;
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .case-metrics-inline {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-top: 28px;
    }

    .case-stat-block {
      border-left: 2px solid var(--accent);
      padding-left: 14px;
    }

    .case-stat-block .stat-num {
      font-family: var(--font-mono);
      font-size: 1.85rem;
      font-weight: 700;
      color: #FFFFFF;
    }

    .case-stat-block .stat-label {
      font-size: 0.8125rem;
      color: #9CA3AF;
    }

    .case-right-visual {
      background: #0F1420;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 24px;
      position: relative;
    }

    .case-code-title {
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--accent);
      margin-bottom: 14px;
      display: flex;
      justify-content: space-between;
    }

    .case-visual-img {
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.05);
    }

    /* 板块 9: 关键性能指标仪表盘 (Metrics) */
    .sec-metrics {
      background: #0A0D14;
      padding: 64px 0;
      border-bottom: 1px solid var(--border-dark);
    }

    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .metric-item {
      padding: 10px;
    }

    .metric-value {
      font-family: var(--font-mono);
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.1;
      margin-bottom: 8px;
    }

    .metric-title {
      font-size: 1rem;
      font-weight: 600;
      color: #F3F4F6;
      margin-bottom: 6px;
    }

    .metric-sub {
      font-size: 0.8125rem;
      color: var(--text-light);
    }

    /* 板块 10: 行业前沿洞察 (Insights) */
    .sec-insights {
      background: #FFFFFF;
    }

    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .insight-card {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #FFFFFF;
      display: flex;
      flex-direction: column;
      transition: all 0.25s ease;
    }

    .insight-card:hover {
      box-shadow: var(--shadow-md);
      border-color: #CBD5E1;
      transform: translateY(-3px);
    }

    .insight-cover {
      height: 190px;
      overflow: hidden;
      background: #E5E7EB;
    }

    .insight-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.35s ease;
    }

    .insight-card:hover .insight-cover img {
      transform: scale(1.04);
    }

    .insight-content {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .insight-date {
      font-size: 0.75rem;
      color: var(--text-light);
      font-family: var(--font-mono);
      margin-bottom: 8px;
    }

    .insight-content h3 {
      font-size: 1.125rem;
      font-weight: 700;
      line-height: 1.4;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .insight-content p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex: 1;
    }

    .insight-link {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--secondary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 板块 11: 信任背书与评测 (Reviews) */
    .sec-reviews {
      background: #F8F9FC;
      border-top: 1px solid var(--border-light);
      border-bottom: 1px solid var(--border-light);
    }

    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }

    .review-stars {
      color: #F59E0B;
      font-size: 1rem;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }

    .review-quote {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 22px;
      flex: 1;
    }

    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F3F4F6;
      padding-top: 16px;
    }

    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #E5E7EB;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--secondary);
      font-size: 0.875rem;
    }

    .reviewer-meta h4 {
      font-size: 0.9375rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .reviewer-meta span {
      font-size: 0.75rem;
      color: var(--text-light);
    }

    /* 板块 12: 技术接入与合规 FAQ */
    .sec-faq {
      background: #FFFFFF;
    }

    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      background: #FAFAFA;
      transition: all 0.2s ease;
      overflow: hidden;
    }

    .faq-item.active {
      background: #FFFFFF;
      border-color: #CBD5E1;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      user-select: none;
    }

    .faq-icon {
      font-size: 1.25rem;
      font-family: var(--font-mono);
      transition: transform 0.25s ease;
      color: var(--secondary);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      padding: 0 24px 20px;
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }

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

    /* 模块化页脚 */
    .site-footer {
      background: #05070B;
      color: #9CA3AF;
      border-top: 1px solid var(--border-dark);
      padding: 72px 0 32px;
      font-size: 0.875rem;
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 48px;
      margin-bottom: 56px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 0.9375rem;
      font-weight: 700;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }

    .footer-brand p {
      line-height: 1.7;
      margin-top: 14px;
      color: #6B7280;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 12px;
    }

    .footer-links a:hover {
      color: var(--accent);
    }

    .footer-contact-item {
      margin-bottom: 10px;
      line-height: 1.6;
    }

    .footer-contact-item strong {
      color: #E5E7EB;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8125rem;
      color: #4B5563;
    }

    .footer-bottom a {
      color: #6B7280;
    }

    .footer-bottom a:hover {
      color: var(--accent);
    }

    /* 移动端菜单抽屉 */
    .mobile-drawer {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(5, 7, 11, 0.98);
      z-index: 2000;
      padding: 30px 24px;
      flex-direction: column;
      justify-content: space-between;
    }

    .mobile-drawer.open {
      display: flex;
    }

    .mobile-drawer-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid var(--border-dark);
      padding-bottom: 18px;
    }

    .mobile-close-btn {
      background: transparent;
      border: none;
      color: #FFFFFF;
      font-size: 24px;
      cursor: pointer;
    }

    .mobile-nav-list {
      list-style: none;
      margin-top: 32px;
    }

    .mobile-nav-list li {
      margin-bottom: 22px;
    }

    .mobile-nav-list a {
      font-size: 1.25rem;
      font-weight: 700;
      color: #FFFFFF;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .security-grid, .badges-row, .matrix-grid, .product-grid, .insights-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-container {
        grid-template-columns: 1fr;
      }
      .metrics-bar {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
      }
      .footer-top-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .header-top-bar {
        display: none;
      }
      .nav-links, .header-cta {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .hero-content h1 {
        font-size: 2.15rem;
      }
      .security-grid, .badges-row, .boundaries-grid, .check-list-wrap, .matrix-grid, .product-grid, .insights-grid, .reviews-grid {
        grid-template-columns: 1fr;
      }
      .metrics-bar {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      section {
        padding: 60px 0;
      }
    }