/* Layout: same component datasheet as Step 01. One column of numbered sheets: spec lines, the live plot, then the check. */
:root {
  --paper: #f5f6f2; --sheet: #ffffff; --ink: #1c2530; --muted: #5a6470; --rule: #d6dad2;
  --accent: #0a6c86; --accent-soft: #e2f0f3; --ok: #1d7a46; --ok-soft: #e4f3ea; --bad: #b3261e; --bad-soft: #fbe9e7;
  --s1: #2a6fdb; --s2: #d4581f; --s3: #148a62; --s4: #6b4fd1; --s5: #c73a3a; --s6: #b07a00; --s7: #8a918f;
  --grid: #e6e9e2; --stable-zone: rgba(20,138,98,.10); --unstable-zone: rgba(199,58,58,.09); --good-zone: rgba(20,138,98,.18);
  --display: "IBM Plex Sans Condensed", "Arial Narrow", sans-serif;
  --body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --paper: #12161b; --sheet: #1a2027; --ink: #e5e9ee; --muted: #9aa5b1; --rule: #2d3640;
  --accent: #5cc3dc; --accent-soft: #163640; --ok: #6fd39a; --ok-soft: #173826; --bad: #ff8a80; --bad-soft: #3d1c1a;
  --s1: #6aa2ff; --s2: #ff8f5a; --s3: #4fd1a0; --s4: #a996ff; --s5: #ff7b7b; --s6: #f2b53a; --s7: #77808a;
  --grid: #252d36; --stable-zone: rgba(79,209,160,.10); --unstable-zone: rgba(255,123,123,.10); --good-zone: rgba(79,209,160,.20);
  color-scheme: dark; } }
:root[data-theme="dark"] {
  --paper: #12161b; --sheet: #1a2027; --ink: #e5e9ee; --muted: #9aa5b1; --rule: #2d3640;
  --accent: #5cc3dc; --accent-soft: #163640; --ok: #6fd39a; --ok-soft: #173826; --bad: #ff8a80; --bad-soft: #3d1c1a;
  --s1: #6aa2ff; --s2: #ff8f5a; --s3: #4fd1a0; --s4: #a996ff; --s5: #ff7b7b; --s6: #f2b53a; --s7: #77808a;
  --grid: #252d36; --stable-zone: rgba(79,209,160,.10); --unstable-zone: rgba(255,123,123,.10); --good-zone: rgba(79,209,160,.20);
  color-scheme: dark; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.6 var(--body); }
.wrap { max-width: 860px; margin: 0 auto; padding-block: 28px 64px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
  display: flex; flex-direction: column; gap: 28px; }
a { color: var(--accent); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
header { display: flex; flex-direction: column; gap: 6px; }
.crumb { font: 500 12px var(--mono); letter-spacing: .04em; color: var(--muted); }
h1 { font: 600 clamp(28px, 6vw, 40px)/1.1 var(--display); margin: 0; text-wrap: balance; }
.lede { color: var(--muted); margin: 0; max-width: 62ch; }
.sheet { background: var(--sheet); border: 1px solid var(--rule); border-radius: 6px; padding: 20px clamp(14px, 3vw, 24px);
  display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.sheet-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; border-bottom: 1px solid var(--rule); padding-bottom: 10px; }
.no { font: 500 12px var(--mono); color: var(--accent); }
h2 { font: 600 22px/1.2 var(--display); margin: 0; text-wrap: balance; }
h2 em { font: italic 400 16px var(--body); color: var(--muted); }
h3 { font: 600 16px/1.3 var(--display); margin: 6px 0 0; letter-spacing: .01em; }
.spec { display: grid; grid-template-columns: max-content 1fr; gap: 4px 14px; margin: 0; }
.spec dt { font: 500 12px/1.9 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.spec dd { margin: 0; min-width: 0; }
.ctrl { display: grid; grid-template-columns: minmax(0, 150px) 1fr 72px; align-items: center; gap: 12px; font-size: 14px; color: var(--muted); }
.ctrl output { font: 500 14px var(--mono); color: var(--ink); text-align: right; font-variant-numeric: tabular-nums; }
input[type=range] { width: 100%; accent-color: var(--accent); }
.plot { position: relative; height: 260px; min-width: 0; }
.pair { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
.pair > div { min-width: 0; }
.cap { font: 12px var(--mono); color: var(--muted); margin: 0 0 4px; }
.readout { display: block; overflow-x: auto; font: 14px var(--mono); font-variant-numeric: tabular-nums; padding: 8px 12px; background: var(--paper); border-radius: 4px; }
.readout b, td b, .race b { font-weight: 500; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 14px; color: var(--muted); }
.legend label, .legend span { display: inline-flex; align-items: center; gap: 6px; }
.sw { width: 18px; height: 0; border-top: 3px solid currentColor; display: inline-block; }
.sw.dash { border-top-style: dashed; } .sw.dot { border-top-style: dotted; }
.dotc { width: 10px; height: 10px; border-radius: 50%; display: inline-block; vertical-align: 0; }
.tbl { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 14px; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--rule); white-space: nowrap; vertical-align: top; }
td.wrap-ok { white-space: normal; min-width: 180px; }
th { font: 500 12px var(--mono); letter-spacing: .04em; color: var(--muted); }
.badge { font: 500 12px var(--mono); padding: 2px 8px; border-radius: 3px; white-space: nowrap; }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.badge.info { background: var(--accent-soft); color: var(--accent); }
.task { border-top: 1px dashed var(--rule); padding-top: 14px; display: flex; flex-direction: column; gap: 10px; }
.task-label { font: 500 12px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.choices, .fields { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.fields label { display: inline-flex; align-items: center; gap: 6px; font: 14px var(--mono); }
input[type=number], select { padding: 6px 8px; font: 14px var(--mono); color: var(--ink); background: var(--paper); border: 1px solid var(--rule); border-radius: 4px; }
input[type=number] { width: 84px; }
button { font: 500 14px var(--body); color: var(--ink); background: var(--paper); border: 1px solid var(--rule); border-radius: 4px; padding: 6px 14px; cursor: pointer; }
button:hover { border-color: var(--accent); }
button.go { background: var(--accent); color: var(--sheet); border-color: var(--accent); min-width: 104px; }
.fb { font-size: 14px; padding: 8px 12px; border-radius: 4px; }
.fb:empty { display: none; }
.fb.ok { background: var(--ok-soft); color: var(--ok); }
.fb.bad { background: var(--bad-soft); color: var(--bad); }
.q { margin: 0; }
.src { font: 12px var(--mono); color: var(--muted); margin: 0; }
.ex { display: flex; flex-direction: column; gap: 8px; padding: 12px 0; border-bottom: 1px solid var(--rule); }
.ex:last-child { border-bottom: 0; }
.tex { display: inline-block; max-width: 100%; overflow-x: auto; overflow-y: hidden; vertical-align: middle; }
math { font-size: 1.08em; }
.arms { width: 100%; height: auto; display: block; }
.arms .lbl { font: 600 14px var(--display); fill: var(--ink); }
.arms .sub { font: 12px var(--mono); fill: var(--muted); }
.bar { height: 10px; border-radius: 2px; display: inline-block; vertical-align: middle; margin-left: 8px; }
.race { display: grid; grid-template-columns: max-content 1fr; gap: 4px 12px; font: 14px var(--mono); font-variant-numeric: tabular-nums; }
.qual { font-size: 14px; padding: 8px 12px; border-radius: 4px; }
.qual.ok { background: var(--ok-soft); color: var(--ok); }
.qual.bad { background: var(--bad-soft); color: var(--bad); }
footer { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 14px; }
@media (max-width: 480px) { .ctrl { grid-template-columns: 1fr 64px; } .ctrl span:first-child { grid-column: 1 / -1; } }