/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: none; text-size-adjust: none;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 64px;
}
img, svg { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
h1, h2, h3 { text-wrap: balance; line-height: 1.15; }
p, li, figcaption, dd, dt { text-wrap: pretty; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

/* ---------- tokens (same family as tgr.rs) ---------- */
:root {
  --bg: #ffffff;
  --fg: #15181c;
  --mute: #5c6570;
  --line: #e1e4e8;
  --rule: #15181c;
  --tile: #f4f6f8;
  --tile-2: #e9edf1;
  --acc: #0b57d0;
  --on-acc: #ffffff;
  --ok: #1a7f37;
  --warn: #9c4d00;
  --bad: #b42318;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, "DejaVu Sans Mono", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --fg: #e3e7ec;
    --mute: #a3adb9;
    --line: #262c34;
    --rule: #e3e7ec;
    --tile: #181d23;
    --tile-2: #20262e;
    --acc: #86adff;
    --on-acc: #0c1220;
    --ok: #5ccb7e;
    --warn: #f0a560;
    --bad: #ff8389;
    color-scheme: dark;
  }
}

body {
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 var(--sans);
  min-height: 100dvh;
}
a { color: var(--acc); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--acc); outline-offset: 2px; border-radius: 2px; }
code { font: 0.88em/1.4 var(--mono); background: var(--tile); padding: 1px 5px; border-radius: 4px; }
.mono { font-family: var(--mono); }

.skip { position: absolute; left: 16px; top: -48px; padding: 8px 12px; background: var(--acc); color: var(--on-acc); z-index: 10; }
.skip:focus { top: 8px; }

.wrap { max-width: 1080px; margin-inline: auto; padding: 0 20px; }

/* ---------- top nav ---------- */
.top {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topnav {
  max-width: 1080px; margin-inline: auto; padding: 12px 20px;
  display: flex; gap: 18px; align-items: baseline;
  font: 13px/1.4 var(--mono);
  overflow-x: auto; white-space: nowrap; scrollbar-width: none;
}
.topnav::-webkit-scrollbar { display: none; }
.topnav a { color: var(--mute); text-decoration: none; flex: 0 0 auto; }
.topnav a:hover, .topnav a.current { color: var(--fg); }
.topnav a.current { text-decoration: underline; text-underline-offset: 6px; }
.topnav .mark { color: var(--fg); font-weight: 700; margin-right: 6px; }

/* ---------- hero ---------- */
.hero { padding: 56px 0 24px; }
.kicker, .label, .meta { font: 13px/1.5 var(--mono); color: var(--mute); }
.kicker { text-transform: uppercase; letter-spacing: .08em; }
h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  letter-spacing: -.025em; line-height: 1.04;
  margin: 10px 0 20px;
  max-width: 18ch;
}
.lead { font-size: 1.2rem; line-height: 1.5; max-width: 62ch; }
.meta { margin-top: 16px; }
.hooks { list-style: none; margin-top: 22px; max-width: 62ch; }
.hooks li { position: relative; padding-left: 1.4em; margin-top: 6px; }
.hooks li::before { content: "→"; position: absolute; left: 0; color: var(--acc); font-family: var(--mono); }
.hooks a { color: var(--fg); text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 3px; }
.hooks a:hover { color: var(--acc); text-decoration-color: currentColor; }

.toc { list-style: none; margin-top: 40px; border-top: 1px solid var(--rule); }
.toc li { border-bottom: 1px solid var(--line); }
.toc a {
  display: grid; grid-template-columns: 3ch minmax(0, 1fr);
  gap: 4px 14px; align-items: baseline;
  padding: 11px 0; color: var(--fg); text-decoration: none;
}
.toc a:hover { color: var(--acc); }
.toc .n { font: 13px/1.4 var(--mono); color: var(--mute); }
.toc .s { grid-column: 2; font-size: .92rem; color: var(--mute); }
@media (min-width: 760px) {
  .toc a { grid-template-columns: 3ch 30ch minmax(0, 1fr); }
  .toc .s { grid-column: 3; }
}

/* ---------- chapters ---------- */
.chapter { padding: 64px 0 24px; }
.ch-head { display: grid; grid-template-columns: auto 1fr; gap: 16px; align-items: baseline; border-top: 1px solid var(--rule); padding-top: 16px; }
.ch-head .num { font: 600 13px/1.4 var(--mono); color: var(--mute); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -.02em; }
.take {
  margin: 28px 0 24px;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  line-height: 1.35; font-weight: 600; letter-spacing: -.01em;
  max-width: 34em;
}
.take .label, .lab .label, .widget .label { display: block; margin-bottom: 6px; text-transform: uppercase; letter-spacing: .08em; font-weight: 600; font-size: 12px; }
.prose { max-width: 70ch; }
.prose p + p, .prose p + ol, .prose ol + p { margin-top: 1em; }
.prose em { font-style: normal; font-weight: 600; }
.threats { padding-left: 1.4em; }
.threats li + li { margin-top: .6em; }

.lab { margin-top: 28px; padding-top: 14px; border-top: 1px solid var(--line); font-size: .95rem; }
.lab ul { list-style: none; }
.lab li + li { margin-top: 6px; }
.lab a { font-family: var(--mono); font-size: .9em; }

/* ---------- widgets ---------- */
.widget {
  margin: 36px 0 0;
  background: var(--tile);
  border-radius: 10px;
  padding: 20px;
}
.widget figcaption { font-size: .95rem; color: var(--fg); max-width: 72ch; margin-bottom: 18px; }
.widget figcaption .label { color: var(--acc); }
.w-grid { display: grid; gap: 22px; }
@media (min-width: 820px) { .w-grid { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); } }

.controls label { display: block; font: 13px/1.5 var(--mono); color: var(--mute); }
.controls label + label, .controls .custom, .controls .presets + .toggles { margin-top: 12px; }
.controls label output { color: var(--fg); font-weight: 600; }
.controls select, .controls input[type=number], .controls textarea {
  display: block; width: 100%; margin-top: 4px;
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px;
  background: var(--bg); color: var(--fg); font: 15px/1.4 var(--sans);
}
.controls textarea { font: 13px/1.5 var(--mono); resize: vertical; }
.controls input[type=range] { display: block; width: 100%; margin-top: 8px; accent-color: var(--acc); }
.controls .custom { padding: 10px; border: 1px dashed var(--line); border-radius: 6px; }
.controls .custom label + label { margin-top: 8px; }
.controls .check { display: flex; gap: 8px; align-items: center; color: var(--fg); font: 15px/1.4 var(--sans); }
.controls .check input { accent-color: var(--acc); width: 16px; height: 16px; }
.btn {
  display: inline-block; margin-top: 14px; padding: 8px 14px;
  border: 1px solid var(--line); border-radius: 6px; background: var(--bg);
  color: var(--fg); font-weight: 600; font-size: 14px;
}
.btn:hover { border-color: var(--fg); }

.results { min-width: 0; }
.kv { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px 18px; }
.kv + .kv { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.kv dt { font: 12px/1.4 var(--mono); color: var(--mute); text-transform: uppercase; letter-spacing: .06em; }
.kv dd { font-size: 1.25rem; font-weight: 600; letter-spacing: -.01em; margin-top: 2px; }
.kv dd small { display: block; font-size: .78rem; font-weight: 400; color: var(--mute); letter-spacing: 0; line-height: 1.35; }
.digests dd { font-size: .78rem; font-weight: 500; word-break: break-all; letter-spacing: 0; }

.bar { height: 8px; background: var(--tile-2); border-radius: 4px; overflow: hidden; margin: 16px 0 8px; }
.bar-fill { height: 100%; width: 0; background: var(--acc); border-radius: 4px; transition: width .25s ease, background-color .25s ease; }
.bar-fill.ok { background: var(--ok); }
.bar-fill.warn { background: var(--warn); }
.bar-fill.bad { background: var(--bad); }

.verdict { font-weight: 600; font-size: 1.02rem; margin-top: 6px; }
.verdict.ok { color: var(--ok); }
.verdict.warn { color: var(--warn); }
.verdict.bad { color: var(--bad); }
.note { font-size: .9rem; color: var(--mute); margin-top: 10px; }
.formula { font: 12px/1.5 var(--mono); color: var(--mute); margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); }

/* chart */
.chart-wrap { position: relative; background: var(--bg); border-radius: 8px; padding: 8px; overflow-x: auto; }
#chart-svg { width: 100%; min-width: 620px; height: auto; font: 12px var(--mono); }
#chart-svg .axis line, #chart-svg .axis path { stroke: var(--line); }
#chart-svg .grid line { stroke: var(--line); stroke-dasharray: 2 4; }
#chart-svg text { fill: var(--mute); }
#chart-svg .pt { cursor: pointer; stroke: var(--bg); stroke-width: 1.5; }
#chart-svg .pt.cpu { fill: var(--mute); }
#chart-svg .pt.uni { fill: var(--acc); }
#chart-svg .pt.gpu { fill: var(--fg); }
#chart-svg .pt.cannot { fill-opacity: .35; }
#chart-svg .pt:hover, #chart-svg .pt:focus { stroke: var(--acc); stroke-width: 3; outline: none; }
#chart-svg .ptlabel { fill: var(--fg); font-size: 11px; pointer-events: none; }
#chart-svg .need { stroke: var(--acc); stroke-dasharray: 4 4; }
#chart-svg .needlabel { fill: var(--acc); font-weight: 600; }
.tip {
  position: absolute; pointer-events: none; z-index: 2;
  background: var(--fg); color: var(--bg); font: 12px/1.45 var(--mono);
  padding: 8px 10px; border-radius: 6px; max-width: 260px;
}
.legend { font: 12px/1.5 var(--mono); color: var(--mute); margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; }
.sw { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; vertical-align: -1px; }
.sw.cpu { background: var(--mute); } .sw.uni { background: var(--acc); } .sw.gpu { background: var(--fg); }

/* capability toggles */
.presets { display: flex; flex-wrap: wrap; gap: 6px; }
.presets button, .reqs button, .layers button, .ladder-steps button {
  border: 1px solid var(--line); background: var(--bg); color: var(--fg);
  border-radius: 6px; padding: 6px 10px; font: 13px/1.4 var(--mono); text-align: left;
}
.presets button:hover, .reqs button:hover, .layers button:hover, .ladder-steps button:hover { border-color: var(--fg); }
.presets button[aria-pressed="true"], .reqs button[aria-selected="true"], .layers button[aria-selected="true"], .ladder-steps button[aria-selected="true"] {
  border-color: var(--acc); box-shadow: inset 0 0 0 1px var(--acc);
}
.toggles { display: grid; gap: 6px; }
.toggles button {
  display: grid; grid-template-columns: 18px 1fr; gap: 10px; align-items: start;
  text-align: left; padding: 9px 10px; border: 1px solid var(--line); border-radius: 6px;
  background: var(--bg); color: var(--fg); font: 15px/1.35 var(--sans);
}
.toggles button .box { width: 16px; height: 16px; margin-top: 2px; border: 1.5px solid var(--mute); border-radius: 4px; position: relative; }
.toggles button[aria-pressed="true"] { border-color: var(--acc); }
.toggles button[aria-pressed="true"] .box { background: var(--acc); border-color: var(--acc); }
.toggles button[aria-pressed="true"] .box::after { content: ""; position: absolute; left: 4px; top: 1px; width: 5px; height: 9px; border: solid var(--on-acc); border-width: 0 2px 2px 0; transform: rotate(45deg); }
.toggles button small { display: block; color: var(--mute); font-size: .82rem; }
.radius { display: grid; grid-template-columns: 1fr auto; gap: 0 12px; align-items: center; }
.radius .label { grid-column: 1 / -1; margin-bottom: 0; }
.radius .bar { margin: 8px 0; }
.chains { list-style: none; margin-top: 10px; display: grid; gap: 8px; }
.chains li { padding: 10px 12px; background: var(--bg); border-radius: 6px; font-size: .95rem; }
.chains li .sev { font: 600 11px/1.4 var(--mono); text-transform: uppercase; letter-spacing: .06em; margin-right: 8px; }
.chains li.critical .sev { color: var(--bad); } .chains li.high .sev { color: var(--bad); } .chains li.medium .sev { color: var(--warn); } .chains li.low .sev { color: var(--ok); }
.chains li .how { display: block; color: var(--mute); font-size: .88rem; margin-top: 2px; }

/* stack */
.stack-grid { display: grid; gap: 18px; }
@media (min-width: 820px) { .stack-grid { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); } }
.layers { display: grid; gap: 4px; }
.layers button { display: grid; grid-template-columns: 2ch 1fr; gap: 10px; padding: 9px 10px; font: 15px/1.35 var(--sans); }
.layers button .i { font: 12px/1.6 var(--mono); color: var(--mute); }
.layers button small { display: block; color: var(--mute); font-size: .82rem; }
.layer-panel { background: var(--bg); border-radius: 8px; padding: 18px 20px; min-height: 200px; }
@media (min-width: 820px) { .stack-grid .layer-panel { position: sticky; top: 64px; align-self: start; } }
.layer-panel h3 { font-size: 1.15rem; letter-spacing: -.01em; margin-bottom: 4px; }
.layer-panel .sub { color: var(--mute); font-size: .92rem; }
.layer-panel .cols { display: grid; gap: 16px; margin-top: 16px; }
@media (min-width: 640px) { .layer-panel .cols { grid-template-columns: 1fr 1fr; } }
.layer-panel .label { color: var(--mute); }
.layer-panel ul { padding-left: 1.2em; font-size: .95rem; }
.layer-panel li + li { margin-top: 5px; }
.layer-panel .todo { color: var(--warn); }
.layer-panel .src { font: 12px/1.4 var(--mono); white-space: nowrap; }
.layer-panel .verdict { margin-top: 14px; font-size: .98rem; }

/* ladder */
.ladder-steps { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; align-items: end; margin-bottom: 14px; }
.ladder-steps button { display: flex; flex-direction: column; justify-content: flex-end; gap: 6px; padding: 8px; min-height: 100px; font: 12px/1.3 var(--mono); border-radius: 6px 6px 0 0; border-bottom-width: 3px; }
.ladder-steps button .rung { width: 100%; background: var(--tile-2); border-radius: 3px; }
.ladder-steps button[aria-selected="true"] .rung { background: var(--acc); }
.ladder-steps button span.t { color: var(--fg); }
@media (max-width: 640px) {
  .ladder-steps { grid-template-columns: 1fr; align-items: stretch; }
  .ladder-steps button { flex-direction: row; align-items: center; justify-content: flex-start; min-height: 0; border-radius: 6px; border-bottom-width: 1px; }
  .ladder-steps button .rung { width: 6px; align-self: stretch; height: auto !important; }
}

/* domains table */
.table-wrap { overflow-x: auto; }
.domains { border-collapse: collapse; width: 100%; min-width: 640px; font-size: .95rem; background: var(--bg); border-radius: 8px; overflow: hidden; }
.domains th, .domains td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.domains th { font: 600 12px/1.4 var(--mono); color: var(--mute); text-transform: uppercase; letter-spacing: .06em; }
.domains td:first-child { font-weight: 600; }
.domains tr:last-child td { border-bottom: 0; }

/* diode */
.diode-grid { display: grid; gap: 18px; }
@media (min-width: 820px) { .diode-grid { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); } }
.reqs { display: grid; gap: 4px; }
.reqs button { font: 12.5px/1.45 var(--mono); padding: 8px 10px; overflow-wrap: anywhere; }
.results.two { display: grid; gap: 14px; }
@media (min-width: 640px) { .results.two { grid-template-columns: 1fr 1fr; } }
.results.two .col { background: var(--bg); border-radius: 8px; padding: 14px; min-width: 0; }
.resp { font: 12px/1.5 var(--mono); white-space: pre-wrap; word-break: break-word; color: var(--fg); min-height: 120px; }
.risk { font-size: .9rem; margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); }
.risk.bad { color: var(--bad); } .risk.ok { color: var(--ok); } .risk.warn { color: var(--warn); }

/* pipeline */
.pipeline { list-style: none; display: grid; gap: 8px; counter-reset: p; }
@media (min-width: 820px) { .pipeline { grid-template-columns: repeat(5, 1fr); } }
.pipeline li { background: var(--bg); border-radius: 8px; padding: 12px 14px; font-size: .95rem; display: grid; gap: 4px; position: relative; }
.pipeline li em { font-style: normal; color: var(--mute); font-size: .85rem; }
.pipeline .who { font: 600 11px/1.4 var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--mute); }
.pipeline .who.ai { color: var(--warn); } .pipeline .who.me { color: var(--ok); } .pipeline .who.nix { color: var(--acc); } .pipeline .who.vm { color: var(--fg); }

/* closing */
.closing .links { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 24px; font: 14px/1.5 var(--mono); }
.foot { padding: 48px 20px 56px; font-size: .88rem; color: var(--mute); border-top: 1px solid var(--line); margin-top: 48px; }
.foot p { max-width: 80ch; }

@media print {
  .top, .skip { display: none; }
  .widget { break-inside: avoid; background: none; border: 1px solid #ccc; }
  a { color: inherit; }
}

/* models table, snippet, webring, planned stages */
.sub-h { font-size: 1.25rem; margin: 40px 0 12px; scroll-margin-top: 72px; }
.models td small { display: block; font: 12px/1.4 var(--mono); color: var(--mute); font-weight: 400; }
.models td:nth-child(n+3) { white-space: nowrap; font-variant-numeric: tabular-nums; }
.snippet { font: 13px/1.5 var(--mono); background: var(--tile); padding: 12px 14px; border-radius: 8px; overflow-x: auto; white-space: pre; margin: 12px 0; }
.closing .webring { margin-top: 12px; align-items: baseline; }
.closing .webring .label { text-transform: uppercase; letter-spacing: .08em; font-size: 12px; font-weight: 600; }
.pipeline li.planned { outline: 1px dashed var(--line); background: transparent; }