/* roulang page: index */
:root {
      --primary: #0F766E;
      --primary-hover: #0D635D;
      --primary-light: #CCFBF1;
      --accent: #F97316;
      --accent-hover: #EA580C;
      --dark: #0F172A;
      --dark-surface: #1E293B;
      --light-bg: #F8FAFC;
      --white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --border: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
      --shadow-lg: 0 12px 28px -4px rgba(15, 118, 110, 0.12);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--white);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input {
      font-family: inherit;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 顶部通告与全局导航 */
    .top-bar {
      background-color: var(--dark);
      color: #CBD5E1;
      font-size: 0.8125rem;
      padding: 0.5rem 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar a:hover {
      color: var(--white);
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
    }
    .brand-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), #14B8A6);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--white);
      font-weight: 800;
      font-size: 1.1rem;
    }

    .nav-menu {
      display: flex;
      gap: 1.75rem;
      list-style: none;
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 0.5rem 0.25rem;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: "";
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--primary);
      border-radius: 2px;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.6875rem 1.375rem;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: var(--white);
      box-shadow: 0 4px 12px rgba(15, 118, 110, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 16px rgba(15, 118, 110, 0.35);
      transform: translateY(-1px);
    }
    .btn-accent {
      background-color: var(--accent);
      color: var(--white);
      box-shadow: 0 4px 12px rgba(249, 115, 22, 0.25);
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--border);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: var(--light-bg);
    }
    .btn-lg {
      padding: 0.875rem 2rem;
      font-size: 1.0625rem;
    }

    /* 标签与徽章 */
    .badge {
      display: inline-flex;
      align-items: center;
      padding: 0.25rem 0.75rem;
      font-size: 0.75rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      background-color: var(--primary-light);
      color: var(--primary);
      margin-bottom: 0.75rem;
    }

    /* 通用区块排版 */
    .section {
      padding: 5.5rem 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--light-bg);
    }
    .section-dark {
      background-color: var(--dark);
      color: var(--white);
    }
    .section-header {
      margin-bottom: 3.5rem;
    }
    .section-title {
      font-size: 2.125rem;
      font-weight: 700;
      line-height: 1.35;
      margin-bottom: 0.875rem;
      color: var(--text-main);
    }
    .section-dark .section-title {
      color: var(--white);
    }
    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      max-width: 820px;
      line-height: 1.8;
    }
    .section-dark .section-desc {
      color: #94A3B8;
    }

    /* 1. 斜切色块首屏 (Hero) */
    .hero-banner {
      position: relative;
      background: #092C28;
      overflow: hidden;
      padding: 6.5rem 0 9.5rem;
      color: var(--white);
    }
    .hero-bg-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.22;
      z-index: 1;
    }
    .hero-skew-wrap {
      position: relative;
      z-index: 2;
    }
    .hero-slanted-box {
      background: linear-gradient(135deg, rgba(15, 118, 110, 0.95), rgba(13, 99, 93, 0.92));
      padding: 3.5rem 3rem;
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
      border: 1px solid rgba(255, 255, 255, 0.15);
      transform: skewY(-1.2deg);
    }
    .hero-inner-unskew {
      transform: skewY(1.2deg);
    }
    .hero-h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 1.25rem;
      letter-spacing: -0.02em;
    }
    .hero-summary {
      font-size: 1.125rem;
      line-height: 1.85;
      color: #E2E8F0;
      max-width: 880px;
      margin-bottom: 2.25rem;
    }
    .hero-actions {
      display: flex;
      gap: 1.25rem;
      align-items: center;
      flex-wrap: wrap;
    }
    .hero-chips {
      margin-top: 2rem;
      display: flex;
      gap: 0.875rem;
      flex-wrap: wrap;
    }
    .hero-chip-tag {
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.2);
      padding: 0.35rem 0.875rem;
      border-radius: var(--radius-full);
      font-size: 0.8125rem;
      color: #CCFBF1;
    }

    /* 2. 入口矩阵 */
    .portal-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .portal-item {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 1.75rem 1.5rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .portal-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .portal-badge {
      font-size: 0.75rem;
      color: var(--primary);
      font-weight: 700;
      text-transform: uppercase;
      margin-bottom: 0.5rem;
    }
    .portal-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 0.6rem;
      color: var(--text-main);
    }
    .portal-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 1rem;
      flex-grow: 1;
    }
    .portal-link {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 0.25rem;
    }

    /* 3. 架构与硬核验证 */
    .architecture-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
    }
    .arch-preview {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border);
    }
    .arch-img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .arch-points {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 1.25rem;
      margin-top: 1.5rem;
    }
    .arch-point-item {
      display: flex;
      gap: 1rem;
    }
    .arch-point-bullet {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.875rem;
      flex-shrink: 0;
      margin-top: 0.2rem;
    }

    /* 4. 最新动态 (News) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .news-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .news-thumb {
      height: 190px;
      width: 100%;
      object-fit: cover;
    }
    .news-content {
      padding: 1.5rem;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .news-meta {
      display: flex;
      justify-content: space-between;
      font-size: 0.8125rem;
      color: var(--text-light);
      margin-bottom: 0.6rem;
    }
    .news-title {
      font-size: 1.15rem;
      font-weight: 700;
      line-height: 1.45;
      margin-bottom: 0.75rem;
      color: var(--text-main);
    }
    .news-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 1.25rem;
      flex-grow: 1;
    }

    /* 5. 核心功能 6 卡片网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 2.25rem 1.75rem;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary);
    }
    .feature-icon-box {
      width: 50px;
      height: 50px;
      background: var(--primary-light);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.35rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .feature-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 0.65rem;
      color: var(--text-main);
    }
    .feature-desc {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 6. 深色认知重构对比区 */
    .comparison-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      margin-top: 2rem;
    }
    .comparison-col {
      background: var(--dark-surface);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .comparison-col.highlight {
      border: 1px solid rgba(20, 184, 166, 0.4);
      background: linear-gradient(180deg, rgba(15, 118, 110, 0.2), var(--dark-surface));
    }
    .col-header {
      padding-bottom: 1.25rem;
      margin-bottom: 1.5rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .col-title {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--white);
    }
    .col-title.accent-teal {
      color: #2DD4BF;
    }
    .comp-item {
      margin-bottom: 1.5rem;
      padding-bottom: 1.25rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }
    .comp-label {
      font-size: 0.875rem;
      color: #94A3B8;
      margin-bottom: 0.35rem;
    }
    .comp-val {
      font-size: 1rem;
      line-height: 1.6;
      color: #F1F5F9;
    }

    /* 7. 精选分类与应用场景 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .scenario-box {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .scenario-box:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .scenario-img {
      width: 100%;
      height: 150px;
      object-fit: cover;
    }
    .scenario-body {
      padding: 1.25rem;
    }
    .scenario-tag {
      font-size: 0.75rem;
      color: var(--primary);
      font-weight: 700;
      margin-bottom: 0.35rem;
    }
    .scenario-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
      color: var(--text-main);
    }
    .scenario-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 8. 拼团与自驱激励 */
    .group-promo-box {
      background: linear-gradient(135deg, #FFF7ED, #FFEDD5);
      border: 1px solid #FED7AA;
      border-radius: var(--radius-lg);
      padding: 3rem;
      position: relative;
    }
    .group-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 2.5rem;
      align-items: center;
    }
    .group-progress-wrap {
      margin: 1.5rem 0;
    }
    .group-progress-bar {
      height: 12px;
      background: #FED7AA;
      border-radius: var(--radius-full);
      overflow: hidden;
    }
    .group-progress-fill {
      width: 78%;
      height: 100%;
      background: var(--accent);
      border-radius: var(--radius-full);
    }
    .group-slots {
      display: flex;
      justify-content: space-between;
      font-size: 0.875rem;
      font-weight: 600;
      color: #9A3412;
      margin-top: 0.5rem;
    }

    /* 9. 关键度量条 */
    .metrics-bar {
      background: var(--primary);
      color: var(--white);
      padding: 3.5rem 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .metric-number {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1;
      margin-bottom: 0.5rem;
      color: #CCFBF1;
    }
    .metric-label {
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 0.35rem;
    }
    .metric-sub {
      font-size: 0.8125rem;
      opacity: 0.85;
      line-height: 1.5;
    }

    /* 10. 用户成长故事与评价墙 */
    .story-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .story-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .story-user {
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-bottom: 1.25rem;
    }
    .story-avatar {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      object-fit: cover;
      border: 2px solid var(--primary-light);
    }
    .story-name {
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-main);
    }
    .story-role {
      font-size: 0.8125rem;
      color: var(--text-light);
    }
    .story-body {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      flex-grow: 1;
      margin-bottom: 1.25rem;
    }
    .story-tags {
      display: flex;
      gap: 0.5rem;
      flex-wrap: wrap;
    }
    .story-tag-pill {
      font-size: 0.75rem;
      background: var(--light-bg);
      padding: 0.25rem 0.6rem;
      border-radius: var(--radius-sm);
      color: var(--primary);
      font-weight: 600;
    }

    /* 11. 版本更新日志 (Changelog) */
    .timeline-wrap {
      max-width: 860px;
      margin: 0 auto;
      border-left: 2px solid #E2E8F0;
      padding-left: 2rem;
      display: flex;
      flex-direction: column;
      gap: 2.25rem;
    }
    .timeline-item {
      position: relative;
    }
    .timeline-dot {
      position: absolute;
      left: calc(-2rem - 6px);
      top: 5px;
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--primary);
      border: 3px solid #CCFBF1;
    }
    .timeline-date {
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 0.25rem;
    }
    .timeline-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
      color: var(--text-main);
    }
    .timeline-desc {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 12. App 与多端矩阵 */
    .multi-device-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .device-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 2.25rem 1.75rem;
      text-align: center;
      transition: var(--transition);
    }
    .device-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .device-icon-tag {
      display: inline-block;
      font-size: 2rem;
      margin-bottom: 1rem;
    }
    .device-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
    }
    .device-desc {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 1.5rem;
    }
    .device-specs {
      font-size: 0.8125rem;
      color: var(--text-light);
      border-top: 1px dashed var(--border);
      padding-top: 1rem;
      margin-bottom: 1.5rem;
    }

    /* 13. 快速解答与常见问题 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-card {
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      background: var(--white);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 1.25rem 1.5rem;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-chevron {
      transition: transform 0.25s ease;
      font-size: 0.875rem;
      color: var(--text-light);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.75;
      background: var(--light-bg);
      padding: 0 1.5rem;
    }
    .faq-card.open .faq-chevron {
      transform: rotate(180deg);
      color: var(--primary);
    }
    .faq-card.open .faq-answer {
      max-height: 240px;
      padding: 1.25rem 1.5rem;
      border-top: 1px solid var(--border);
    }

    /* 14. 转化收口行动号召 */
    .cta-banner {
      background: linear-gradient(135deg, var(--primary), #0B4F4A);
      color: var(--white);
      border-radius: var(--radius-lg);
      padding: 4rem 3rem;
      text-align: center;
      box-shadow: var(--shadow-lg);
    }
    .cta-banner-title {
      font-size: 2.25rem;
      font-weight: 800;
      margin-bottom: 1rem;
    }
    .cta-banner-desc {
      font-size: 1.0625rem;
      max-width: 680px;
      margin: 0 auto 2.25rem;
      color: #CCFBF1;
      line-height: 1.8;
    }
    .cta-form {
      display: flex;
      max-width: 520px;
      margin: 0 auto 1.25rem;
      gap: 0.75rem;
    }
    .cta-input {
      flex-grow: 1;
      padding: 0.875rem 1.25rem;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.3);
      font-size: 1rem;
      outline: none;
      background: rgba(255, 255, 255, 0.95);
      color: var(--text-main);
    }
    .cta-input:focus {
      background: var(--white);
      border-color: var(--accent);
    }
    .cta-trust-note {
      font-size: 0.8125rem;
      color: #99F6E4;
      display: flex;
      justify-content: center;
      gap: 1.5rem;
      margin-top: 1rem;
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--dark);
      color: #94A3B8;
      padding: 5rem 0 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9375rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .footer-brand-title {
      color: var(--white);
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .footer-text {
      line-height: 1.7;
      margin-bottom: 1.25rem;
      font-size: 0.875rem;
    }
    .footer-links-title {
      color: var(--white);
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 1.25rem;
    }
    .footer-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
    }
    .footer-list a {
      color: #94A3B8;
      font-size: 0.875rem;
    }
    .footer-list a:hover {
      color: var(--white);
    }
    .footer-contact-item {
      margin-bottom: 0.75rem;
      font-size: 0.875rem;
      line-height: 1.6;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 2rem;
      text-align: center;
      font-size: 0.8125rem;
      color: #64748B;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }
    .footer-bottom a {
      color: #94A3B8;
    }
    .footer-bottom a:hover {
      color: var(--white);
    }

    /* 移动端菜单控制 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 0.5rem;
      color: var(--text-main);
    }
    .menu-icon-bar {
      width: 22px;
      height: 2px;
      background-color: var(--text-main);
      margin: 4px 0;
      transition: var(--transition);
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .portal-grid, .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .features-grid, .news-grid, .story-grid, .multi-device-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 1.5rem;
        gap: 1rem;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid var(--border);
        display: none;
      }
      .nav-menu.active {
        display: flex;
      }
      .hero-h1 {
        font-size: 2.15rem;
      }
      .hero-slanted-box {
        padding: 2.25rem 1.5rem;
        transform: none;
      }
      .hero-inner-unskew {
        transform: none;
      }
      .architecture-box, .comparison-table, .group-grid {
        grid-template-columns: 1fr;
      }
      .portal-grid, .scenarios-grid, .features-grid, .news-grid, .story-grid, .multi-device-grid {
        grid-template-columns: 1fr;
      }
      .cta-form {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }