:root {
    --bg: #0b0d12; --bg2: #11141c; --panel: #161a24; --line: #262c3a;
    --text: #e6e8ee; --muted: #9aa3b5; --accent: #5ad7ff; --accent2: #ff5a6e; --gold: #e4b85a;
    --maxw: 1080px;
  }
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
  a { color: var(--accent); }
  h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
  h1 { font-size: clamp(2rem, 5vw, 3.4rem); letter-spacing: -.02em; }
  h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); margin-top: 0; }
  h3 { font-size: 1.15rem; color: var(--accent); margin-top: 1.4em; }
  p, li { max-width: 72ch; }
  .wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }
  header.hero { padding: 56px 0 32px; border-bottom: 1px solid var(--line); background: radial-gradient(1200px 500px at 20% -10%, #1d2a3f 0%, var(--bg) 60%); }
  .kicker { color: var(--gold); text-transform: uppercase; letter-spacing: .14em; font-size: .8rem; font-weight: 600; margin-bottom: 12px; }
  .lead { font-size: 1.15rem; color: var(--muted); max-width: 64ch; }
  .notice { margin-top: 24px; padding: 14px 16px; border: 1px solid #3a2a2e; background: #1b1418; border-radius: 10px; color: #f1d7db; font-size: .95rem; max-width: 72ch; }
  .notice strong { color: #ffb3bd; }
  nav.toc { display: flex; flex-wrap: wrap; gap: 8px 18px; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: .95rem; position: sticky; top: 0; background: rgba(11,13,18,.92); backdrop-filter: blur(6px); z-index: 5; }
  nav.toc a { color: var(--muted); text-decoration: none; }
  nav.toc a:hover { color: var(--text); }
  section { padding: 48px 0; border-bottom: 1px solid var(--line); }
  .grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
  figure { margin: 0; background: var(--panel); border: 1px solid var(--line); }
  figure img { display: block; width: 100%; height: auto; image-rendering: pixelated; image-rendering: crisp-edges; background: #000; }
  figure figcaption { padding: 8px 12px 10px; font-size: .9rem; color: var(--muted); }
  .wide { grid-column: 1 / -1; }
  video { display: block; width: 100%; height: auto; background: #000; border: 1px solid var(--line); }
  .vid { margin: 18px 0 6px; }
  .vid p { color: var(--muted); font-size: .95rem; margin: 8px 0 0; }
  table { border-collapse: collapse; margin: 12px 0 20px; font-size: .95rem; }
  th, td { text-align: left; padding: 8px 14px 8px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
  th { color: var(--muted); font-weight: 600; }
  .cols { display: grid; gap: 28px; grid-template-columns: 1fr; }
  @media (min-width: 860px) { .cols { grid-template-columns: 1fr 1fr; } }
  .card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; }
  .card h3 { margin-top: 0; }
  code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .9em; color: #cfe6ff; background: #1a2130; padding: 1px 5px; border-radius: 4px; }
  .legal { background: var(--bg2); }
  .legal p, .legal li { color: #d6d9e0; }
  footer { padding: 28px 0 48px; color: var(--muted); font-size: .9rem; }
  .tag { display: inline-block; font-size: .78rem; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); margin-right: 6px; }
  .p2 { color: var(--accent2); font-weight: 600; }
  .p1 { color: var(--accent); font-weight: 600; }
  /* the three pages' switch (index, neogeo, arcade) */
  .switch { border-bottom: 1px solid var(--line); background: var(--bg2); font-size: .92rem; }
  .switch .wrap { display: flex; flex-wrap: wrap; gap: 6px 22px; align-items: center; padding-top: 10px; padding-bottom: 10px; }
  .switch .home { color: var(--gold); font-weight: 600; letter-spacing: .08em; text-transform: uppercase; font-size: .8rem; text-decoration: none; margin-right: 6px; }
  .switch a { color: var(--muted); text-decoration: none; }
  .switch a:hover { color: var(--text); }
  .switch a.on { color: var(--text); border-bottom: 2px solid var(--accent); padding-bottom: 2px; }
  /* the landing page's two projects */
  .projects { display: grid; gap: 22px; grid-template-columns: 1fr; margin-top: 8px; }
  @media (min-width: 860px) { .projects { grid-template-columns: 1fr 1fr; } }
  a.project { display: flex; flex-direction: column; color: var(--text); text-decoration: none; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; transition: border-color .15s; }
  a.project:hover { border-color: var(--accent); }
  a.project img { display: block; width: 100%; height: auto; image-rendering: pixelated; image-rendering: crisp-edges; background: #000; border-bottom: 1px solid var(--line); }
  a.project .body { padding: 18px 20px 20px; }
  a.project .kicker { margin-bottom: 6px; }
  a.project h2 { font-size: 1.45rem; margin-bottom: .4em; }
  a.project p { color: var(--muted); margin: 0 0 .8em; }
  a.project ul { margin: 0 0 1em; padding-left: 1.2em; color: var(--text); }
  a.project .go { color: var(--accent); font-weight: 600; }
  .note { margin: 18px 0 0; padding: 12px 16px; border-left: 3px solid var(--gold); background: var(--bg2); color: #e9dfc6; max-width: 72ch; font-size: .95rem; }