/* About page. Builds on base.css and hub.css; the diagram reuses the error pages' column language. */

.about { max-width: 920px; }
.about__head { padding: 64px 0 36px; border-bottom: 1px solid var(--line); }
.about__kicker {
  margin: 0 0 14px; font-size: 12.5px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ember);
}
.about__title { margin: 0; max-width: 20ch; font-size: clamp(30px, 4.8vw, 46px); line-height: 1.1; font-weight: 600; letter-spacing: -0.025em; }
.about__lede { margin: 18px 0 0; max-width: 60ch; font-size: 17px; line-height: 1.6; color: var(--text-2); }

.about__live { margin: 30px 0 0; display: flex; flex-wrap: wrap; gap: 14px 40px; }
.about__live dt { font-size: 12.5px; color: var(--text-3); }
.about__live dd { margin: 3px 0 0; font-family: var(--mono); font-size: 15px; color: var(--ember); overflow-wrap: anywhere; }
.about__live-wide { flex: 1 1 320px; }
.about__live-wide dd { color: var(--text); font-size: 14px; }

.about__section { padding: 40px 0; border-bottom: 1px solid var(--line); }
.about__section:last-child { border-bottom: 0; }
.about__section--split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 48px; }
.about__h2 { margin: 0 0 16px; font-size: 20px; font-weight: 600; letter-spacing: -0.01em; }
.about__h2::before {
  content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 10px; vertical-align: 3px;
  border-radius: 2px; background: var(--ember);
}
.about__p, .about__cols p, .about__list li { font-size: 15px; line-height: 1.65; color: var(--text-2); }
.about__p { margin: 0; max-width: 64ch; }
.about strong { color: var(--text); font-weight: 600; }
.about__cols { columns: 2 320px; column-gap: 40px; margin-top: 8px; }
.about__cols p { margin: 0 0 14px; break-inside: avoid; }
.about__list { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; max-width: 72ch; }
.about__list li { position: relative; padding-left: 22px; }
.about__list li::before {
  content: ""; position: absolute; left: 2px; top: 0.62em; width: 7px; height: 7px; border-radius: 2px;
  background: var(--surface-3); box-shadow: inset 0 0 0 1px var(--line-strong);
}
.about__link { color: var(--ember); text-underline-offset: 3px; text-decoration-color: var(--ember-line); }
.about__link:hover { text-decoration-color: var(--ember); }

/* ---------- Diagram ---------- */
.about__figure { margin: 4px 0 20px; padding: 18px 12px 8px; border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); }
.about-diagram { display: block; width: 100%; height: auto; }
.about-diagram {
  --a-top: #3a4048; --a-left: #2c3137; --a-front: #262a30; --a-right: #20242a; --a-line: #8d96a0;
}
:root[data-theme="light"] .about-diagram { --a-top: #eceef0; --a-left: #d9dde1; --a-front: #cfd4d9; --a-right: #c3c9cf; --a-line: #6f7882; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .about-diagram { --a-top: #eceef0; --a-left: #d9dde1; --a-front: #cfd4d9; --a-right: #c3c9cf; --a-line: #6f7882; }
}
.about-diagram .f-top, .about-diagram .f-left, .about-diagram .f-front, .about-diagram .f-right { stroke: var(--a-line); stroke-width: 1.6; stroke-linejoin: round; }
.about-diagram .f-top { fill: var(--a-top); } .about-diagram .f-left { fill: var(--a-left); }
.about-diagram .f-front { fill: var(--a-front); } .about-diagram .f-right { fill: var(--a-right); }
.about-diagram .f-ember { fill: var(--ember); stroke: var(--ember-2); stroke-width: 1.2; stroke-linejoin: round; }
.d-flow { fill: none; stroke: var(--ember); stroke-width: 2; stroke-dasharray: 4 6; stroke-linecap: round; }
.d-check { fill: none; stroke: var(--text-3); stroke-width: 1.5; stroke-dasharray: 2 4; stroke-linecap: round; }
.d-check-dot { fill: var(--surface); stroke: var(--text-3); stroke-width: 1.5; }
.d-zone { fill: none; stroke: var(--line-strong); stroke-width: 1.5; stroke-dasharray: 1 5; stroke-linecap: round; }
.d-zone-label, .d-row { fill: var(--text-3); font: 500 11.5px var(--font); }
.d-row { font-weight: 400; }
.d-you { fill: var(--surface-2); stroke: var(--a-line); stroke-width: 1.6; }
.d-you-fill { fill: var(--text-2); }
.d-name { fill: var(--text); font: 600 14px var(--font); }
.d-sub { fill: var(--text-3); font: 11.5px var(--font); }
.d-svc { fill: var(--text-2); font: 600 12.5px var(--font); }
.d-note { fill: var(--text-3); font: italic 11.5px var(--font); }
.d-model { fill: var(--ember); font: 500 12px var(--mono); }
/* GPU box asleep: the molten top cools to stone, and nothing flows to it. */
.about-diagram.is-asleep .d-gpu-col .f-ember { fill: var(--a-top); stroke: var(--a-line); stroke-width: 1.6; }
.about-diagram.is-asleep .d-model { fill: var(--text-3); }
.about-diagram.is-asleep .d-gpu { stroke: var(--text-3); animation: none; }
@media (prefers-reduced-motion: no-preference) {
  .d-flow { animation: d-flow 1.2s linear infinite; }
  .d-flow--slow { animation-duration: 2s; }
  @keyframes d-flow { to { stroke-dashoffset: -20; } }
}

/* ---------- Top bar link (shared by the hub pages) ---------- */
.hub-nav { text-decoration: none; }
.hub-nav[aria-current="page"] { color: var(--ember); }

@media (max-width: 900px) {
  .about__head { padding: 36px 0 28px; }
  .about__section { padding: 30px 0; }
  .about__section--split { grid-template-columns: minmax(0, 1fr); }
  .about__figure { padding: 10px 4px 2px; overflow-x: auto; }
  .about-diagram { min-width: 640px; }   /* labels stay readable; the figure scrolls sideways instead */
}