:root {
      --bg: #050816;
      --bg-alt: #0b1020;
      --card-bg: #0f172a;
      --accent: #38bdf8;
      --accent-soft: rgba(56,189,248,0.15);
      --text: #e5e7eb;
      --muted: #9ca3af;
      --border-subtle: rgba(148,163,184,0.3);
      --radius-lg: 1.5rem;
      --radius-md: 0.9rem;
      --shadow-soft: 0 18px 45px rgba(15,23,42,0.7);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      min-height: 100vh;
      font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
      background: radial-gradient(circle at top, #0f172a 0, #020617 55%, #000 100%);
      color: var(--text);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 24px;
    }

    .shell {
      width: 100%;
      max-width: 1100px;
      background: radial-gradient(circle at top left, rgba(56,189,248,0.2), transparent 50%),
                  radial-gradient(circle at bottom right, rgba(129,140,248,0.2), transparent 55%),
                  linear-gradient(145deg, #020617, #020617);
      border-radius: 2rem;
      padding: 1px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-soft);
    }

    .shell::before {
      /* subtle border glow */
      content: "";
      position: absolute;
      inset: 0;
      border-radius: inherit;
      border: 1px solid rgba(148,163,184,0.35);
      pointer-events: none;
    }

    .shell-inner {
      position: relative;
      border-radius: inherit;
      background: radial-gradient(circle at top left, rgba(15,23,42,0.9), rgba(15,23,42,0.98));
      padding: 24px 24px 28px;
    }

    .topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      margin-bottom: 24px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-mark {
      width: 32px;
      height: 32px;
      border-radius: 999px;
      background:
        radial-gradient(circle at 30% 20%, rgba(248,250,252,0.9), transparent 55%),
        conic-gradient(from 210deg, #38bdf8, #4f46e5, #22c55e, #38bdf8);
      padding: 2px;
      position: relative;
    }

    .brand-mark::after {
      content: "";
      position: absolute;
      inset: 3px;
      border-radius: inherit;
      background: rgba(15,23,42,0.96);
    }

    .brand-info {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .brand-title {
      font-size: 1.05rem;
      font-weight: 600;
      letter-spacing: 0.09em;
      text-transform: uppercase;
      color: #e5e7eb;
    }

    .brand-sub {
      font-size: 0.78rem;
      color: var(--muted);
    }

    .pill {
      border-radius: 999px;
      border: 1px solid rgba(148,163,184,0.5);
      padding: 4px 10px;
      font-size: 0.75rem;
      color: var(--muted);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(15,23,42,0.9);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      white-space: nowrap;
    }

    .pill-dot {
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: #22c55e;
      box-shadow: 0 0 0 6px rgba(34,197,94,0.25);
    }

    .main {
      display: grid;
      grid-template-columns: minmax(0, 1.4fr) minmax(0, 2fr);
      gap: 20px;
      align-items: stretch;
    }

    @media (max-width: 800px) {
      .shell-inner {
        padding: 18px 18px 24px;
      }
      .main {
        grid-template-columns: minmax(0, 1fr);
      }
      .topbar {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    .intro {
      padding: 18px 18px 20px;
      border-radius: var(--radius-lg);
      border: 1px solid rgba(148,163,184,0.4);
      background:
        radial-gradient(circle at top left, rgba(56,189,248,0.15), transparent 60%),
        rgba(15,23,42,0.95);
      box-shadow: 0 18px 40px rgba(15,23,42,0.85);
      position: relative;
      overflow: hidden;
    }

    .intro::after {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at top right, rgba(56,189,248,0.16), transparent 60%);
      opacity: 0.9;
      pointer-events: none;
    }

    .intro-inner {
      position: relative;
      z-index: 1;
    }

    .intro-eyebrow {
      font-size: 0.8rem;
      text-transform: uppercase;
      letter-spacing: 0.18em;
      color: var(--accent);
      margin-bottom: 6px;
    }

    .intro-title {
      font-size: 1.6rem;
      font-weight: 600;
      margin-bottom: 6px;
    }

    .intro-text {
      font-size: 0.9rem;
      color: var(--muted);
      line-height: 1.7;
      margin-bottom: 12px;
    }

    .intro-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      font-size: 0.78rem;
      color: #9ca3af;
    }

    .intro-meta span {
      padding: 3px 9px;
      border-radius: 999px;
      background: rgba(15,23,42,0.9);
      border: 1px solid rgba(148,163,184,0.45);
    }

    .tools-panel {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .tools-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 8px;
      margin-bottom: 4px;
    }

    .tools-title {
      font-size: 0.98rem;
      font-weight: 500;
      color: #e5e7eb;
    }

    .tools-sub {
      font-size: 0.8rem;
      color: var(--muted);
    }

    .tools-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 10px;
    }

    .tool-card {
      position: relative;
      border-radius: var(--radius-md);
      padding: 11px 12px 12px;
      background: rgba(15,23,42,0.98);
      border: 1px solid rgba(148,163,184,0.45);
      overflow: hidden;
      cursor: pointer;
      text-decoration: none;
      color: inherit;
      display: flex;
      flex-direction: column;
      gap: 6px;
      transition:
        border-color 150ms ease,
        box-shadow 150ms ease,
        transform 150ms ease,
        background 150ms ease;
    }

    .tool-card::before {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at top, var(--accent-soft), transparent 60%);
      opacity: 0;
      transition: opacity 150ms ease;
    }

    .tool-card:hover {
      border-color: rgba(56,189,248,0.85);
      box-shadow: 0 14px 35px rgba(15,23,42,0.9);
      transform: translateY(-2px) translateZ(0);
      background: #020617;
    }

    .tool-card:hover::before {
      opacity: 1;
    }

    .tool-top {
      display: flex;
      justify-content: space-between;
      gap: 6px;
      align-items: center;
    }

    .tool-info {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .tool-name {
      font-size: 0.95rem;
      font-weight: 500;
    }

    .tool-label {
      font-size: 0.78rem;
      text-transform: uppercase;
      letter-spacing: 0.12em;
      color: var(--muted);
    }

    .tool-pill {
      padding: 3px 8px;
      border-radius: 999px;
      background: rgba(15,23,42,0.95);
      border: 1px solid rgba(148,163,184,0.7);
      font-size: 0.75rem;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      white-space: nowrap;
    }

    .tool-pill-dot {
      width: 6px;
      height: 6px;
      border-radius: 999px;
      background: var(--accent);
    }

    .tool-desc {
      font-size: 0.8rem;
      color: var(--muted);
      line-height: 1.5;
    }

    .tool-footer {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-top: 4px;
      font-size: 0.75rem;
      color: #6b7280;
    }

    .tool-link {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 0.76rem;
    }

    .tool-link-icon {
      font-size: 0.9em;
      translate: 0 0;
      transition: translate 150ms ease;
    }

    .tool-card:hover .tool-link-icon {
      translate: 1px -1px;
    }

    .divider {
      height: 1px;
      background: linear-gradient(to right, transparent, rgba(148,163,184,0.5), transparent);
      margin: 10px 0 4px;
    }

    .footer-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 10px;
      margin-top: 6px;
      font-size: 0.78rem;
      color: var(--muted);
    }

    .footer-row a {
      color: var(--accent);
      text-decoration: none;
      font-weight: 500;
    }

    .footer-row a:hover {
      text-decoration: underline;
    }