html,
      body {
        height: 100%;
        margin: 0;
        padding: 0;
        overflow: hidden;
      }

      body {
        display: flex;
        flex-direction: column;
      }

      #bg-canvas {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        z-index: 0;
        pointer-events: none;
      }

      .top-bar {
        position: sticky;
        top: 0;
        z-index: 100;
        background: color-mix(in srgb, var(--surface) 90%, transparent);
        backdrop-filter: blur(8px);
      }

      .page-shell {
        flex: 1;
        display: flex;
        flex-direction: column;
        overflow: hidden;
        position: relative;
        z-index: 1;
        width: 100%;
        max-width: 1400px;
        margin: 0 auto;
      }

      .hub-hero {
        text-align: center;
        padding: 3rem 1rem 1.5rem;
        flex-shrink: 0;
      }
      .hub-hero .title-serif {
        font-family:
          system-ui,
          -apple-system,
          sans-serif;
        font-size: clamp(1.8rem, 4vw, 2.8rem);
        font-weight: 400;
        color: var(--ink);
        line-height: 1.25;
        margin-bottom: 0.6rem;
      }
      .hub-hero .title-serif em {
        font-style: italic;
        color: var(--accent);
      }
      .hub-hero .subtitle {
        font-family:
          system-ui,
          -apple-system,
          sans-serif;
        font-size: 16px;
        color: var(--ink2);
        max-width: 38ch;
        margin: 0 auto 1.5rem;
        line-height: 1.6;
      }

      .top-bar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0.8rem 1.25rem;
        border-bottom: 1px solid var(--border);
      }
      .top-bar-logo {
        font-family: "JetBrains Mono", monospace;
        font-size: 15px;
        color: var(--ink3);
        letter-spacing: 0.06em;
        display: inline-flex;
        align-items: center;
        gap: 6px;
      }
      .top-bar-logo span {
        color: var(--accent);
      }

      .card-grid {
        display: flex;
        flex-direction: row;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: 18px;
        padding: 1rem 2rem 2rem 2rem;
        margin-top: 0;
        flex: 1;
        align-items: center;
      }

      .carousel-wrapper {
        position: relative;
        display: flex;
        flex: 1;
        width: 100%;
        align-items: stretch;
      }

      .carousel-btn {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        background: color-mix(in srgb, var(--surface) 90%, transparent);
        border: 1px solid var(--border2);
        color: var(--ink);
        width: 48px;
        height: 48px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        z-index: 10;
        box-shadow: var(--shadow);
        transition: all 0.2s;
        backdrop-filter: blur(8px);
      }
      .carousel-btn:hover {
        background: var(--surface);
        border-color: var(--accent);
        color: var(--accent);
        transform: translateY(-50%) scale(1.05);
      }
      .carousel-btn.left {
        left: 1rem;
      }
      .carousel-btn.right {
        right: 1rem;
      }
      .carousel-btn.hidden {
        opacity: 0;
        pointer-events: none;
        transform: translateY(-50%) scale(0.9);
      }

      .card-grid::-webkit-scrollbar {
        display: none;
      }
      .card-grid::-webkit-scrollbar-track {
        background: transparent;
        margin: 0 2rem;
      }
      .card-grid::-webkit-scrollbar-thumb {
        background: var(--surface2);
        border-radius: 4px;
      }
      .card-grid::-webkit-scrollbar-thumb:hover {
        background: var(--border);
      }

      .module-card {
        min-width: 340px;
        max-width: 400px;
        height: max-content;
        flex-shrink: 0;
        scroll-snap-align: center;
        background: color-mix(in srgb, var(--surface) 85%, transparent);
        backdrop-filter: blur(8px);
        border: 1px solid var(--border2);
        border-radius: 10px;
        overflow: hidden;
        transition:
          transform 0.2s,
          box-shadow 0.2s,
          border-color 0.2s;
        text-decoration: none;
        color: inherit;
        display: flex;
        flex-direction: column;
      }
      .module-card:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow);
        border-color: var(--accent);
      }

      .card-preview {
        position: relative;
        height: 140px;
        background: var(--canvas-bg);
        border-bottom: 1px solid var(--border2);
        overflow: hidden;
        flex-shrink: 0;
      }
      .card-preview canvas {
        width: 100%;
        height: 100%;
        border-radius: 0;
        border: none;
      }

      .card-body {
        padding: 14px 16px 16px;
        flex: 1;
        display: flex;
        flex-direction: column;
      }
      .card-accent-bar {
        height: 2px;
        border-radius: 2px;
        margin-bottom: 10px;
      }
      .card-title {
        font-family:
          system-ui,
          -apple-system,
          sans-serif;
        font-size: 1.2rem;
        font-weight: 500;
        color: var(--ink);
        margin-bottom: 4px;
        display: flex;
        align-items: center;
        gap: 8px;
      }
      .card-subtitle {
        font-family: "JetBrains Mono", monospace;
        font-size: 12px;
        color: var(--ink3);
        letter-spacing: 0.08em;
        text-transform: uppercase;
        margin-bottom: 6px;
      }
      .card-desc {
        font-family:
          system-ui,
          -apple-system,
          sans-serif;
        font-size: 15px;
        color: var(--ink2);
        line-height: 1.55;
        flex: 1;
      }
      .card-footer {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-top: 12px;
        padding-top: 10px;
        border-top: 1px solid var(--border);
      }
      .card-tags {
        display: flex;
        gap: 4px;
        flex-wrap: wrap;
      }
      .card-tag {
        font-family: "JetBrains Mono", monospace;
        font-size: 12px;
        color: var(--ink3);
        border: 1px solid var(--border2);
        border-radius: 3px;
        padding: 1px 5px;
      }
      .card-open-btn {
        font-family:
          system-ui,
          -apple-system,
          sans-serif;
        font-size: 14px;
        padding: 5px 12px;
        border-radius: 4px;
        background: var(--accent);
        color: #fff;
        border: none;
        cursor: pointer;
        display: flex;
        align-items: center;
        gap: 5px;
        transition: opacity 0.15s;
        white-space: nowrap;
        text-decoration: none;
      }
      .card-open-btn:hover {
        opacity: 0.85;
      }

      .hub-footer {
        text-align: center;
        padding: 1.25rem 1rem;
        border-top: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
        font-family:
          system-ui,
          -apple-system,
          sans-serif;
        font-size: 14px;
        color: var(--ink3);
        flex-shrink: 0;
      }
      .hub-footer a {
        color: var(--ink3);
        text-decoration: underline;
        text-underline-offset: 2px;
      }

      @media (max-width: 768px) {
        html,
        body {
          height: auto;
          overflow: visible;
        }
        .page-shell {
          height: auto;
          overflow: visible;
        }

        .hub-hero {
          padding: 1.5rem 1rem 0.5rem;
        }
        .hub-hero .title-serif {
          font-size: 1.8rem;
        }
        .hub-hero .subtitle {
          font-size: 14px;
          margin-bottom: 0;
        }
        .module-card {
          min-width: 280px;
          max-width: 85vw;
        }
        .card-grid {
          padding: 1rem 1rem 1.5rem 1rem;
          gap: 12px;
          align-items: stretch;
        }
        .card-grid::-webkit-scrollbar-track {
          margin: 0 1rem;
        }
        .hub-footer {
          padding: 1rem;
          font-size: 12px;
        }
        .card-preview {
          height: 120px;
        }
        .card-body {
          padding: 12px 14px 14px;
        }
        .card-title {
          font-size: 1.1rem;
        }
        .card-desc {
          font-size: 14px;
        }
      }

      @media (max-height: 700px) and (min-width: 769px) {
        .hub-hero {
          padding: 1rem 1rem 0;
        }
        .card-grid {
          padding-top: 0.5rem;
        }
        .card-preview {
          height: 110px;
        }
        .card-desc {
          font-size: 13px;
          line-height: 1.4;
        }
        .hub-footer {
          padding: 0.5rem;
          border-top: none;
        }
      }