:root { --ink: #111; --fill: #dcdcdc; --mute: #5c5c5c; --rule: #cfcfcf; --bg: #fff; color-scheme: light; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 "KaTeX_Main", "Times New Roman", serif; }
main { max-width: 680px; margin: 0 auto; padding: 20px 16px 40px; }
.kicker { margin: 0; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--mute); }
.kicker a { color: inherit; text-decoration: none; }
.kicker a:hover { text-decoration: underline; }
.back { display: inline-flex; align-items: center; min-height: 40px; margin: 0 0 10px; padding: 6px 14px; border: 1px solid var(--ink); border-radius: 2px; color: var(--ink); text-decoration: none; font-size: 14px; }
.back:hover { background: var(--ink); color: var(--bg); }
h1 { margin: 2px 0 6px; font-size: clamp(22px, 5.5vw, 30px); font-weight: 400; line-height: 1.2; }
.lede { margin: 0 0 14px; color: var(--mute); font-size: 15px; }
canvas { display: block; width: 100%; touch-action: none; cursor: default; }
canvas.grab { cursor: grab; }
.controls { margin: 10px 0 0; padding: 12px 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.row { display: grid; grid-template-columns: 112px 1fr 64px; align-items: center; gap: 10px; min-height: 40px; }
.row .sym { font-size: 18px; white-space: nowrap; }
.row output { text-align: right; font-variant-numeric: tabular-nums; }
input[type=range] { width: 100%; height: 28px; accent-color: var(--ink); }
.buttons { display: flex; gap: 10px; margin-top: 10px; }
button { font: inherit; font-size: 15px; padding: 8px 16px; min-height: 40px; border: 1px solid var(--ink); background: var(--bg); color: var(--ink); border-radius: 2px; cursor: pointer; }
button[aria-pressed=true] { background: var(--ink); color: var(--bg); }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
.eqs { margin: 18px 0 0; font-size: 14px; overflow-x: auto; }
@media (max-width: 480px) { .eqs { font-size: 13px; } }
.eqs .katex-display { margin: .35em 0; text-align: left; }
.eqs .katex-display > .katex { text-align: left; }
footer { margin-top: 26px; font-size: 13px; color: var(--mute); }
footer a { color: inherit; }
/* hub */
.cards { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 18px; }
.card { display: grid; grid-template-columns: 112px 1fr; gap: 14px; align-items: center; color: inherit; text-decoration: none; border: 1px solid var(--rule); padding: 10px; min-height: 44px; }
.card:hover { border-color: var(--ink); }
.card img { width: 112px; height: 84px; object-fit: cover; object-position: center; border: 1px solid var(--rule); background: #fff; }
.card .no { margin: 0; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--mute); }
.card h2 { margin: 2px 0 4px; font-size: 19px; font-weight: 400; line-height: 1.25; }
.card p { margin: 0; color: var(--mute); font-size: 14px; }
@media (min-width: 560px) { .cards { grid-template-columns: 1fr 1fr; } .card { grid-template-columns: 1fr; } .card img { width: 100%; height: 150px; } }