/* Layout: drafting-sheet page — a sticky "viewer" plate beside the controls, then the engineer's notes below in a single reading column. */
:root {
  --paper: #edf1f4;
  --sheet: #f8fafb;
  --grid: #dbe3ea;
  --ink: #17283a;
  --ink-2: #4f6276;
  --rule: #c5d1db;
  --accent: #e2611c;      /* moving parts */
  --steel: #7b8a99;       /* fixed parts */
  --good: #2f7d4f;
  --warn: #b7791f;
  --bad: #c0392b;
  --chip: #e3eaf0;
  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --body: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0f1720; --sheet: #15202b; --grid: #1e2b38; --ink: #e4ecf3; --ink-2: #9aaebf;
    --rule: #2a3948; --accent: #f07a3a; --steel: #8494a4; --good: #5bbf84; --warn: #e0a84a; --bad: #ef6b5e;
    --chip: #1e2b38; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0f1720; --sheet: #15202b; --grid: #1e2b38; --ink: #e4ecf3; --ink-2: #9aaebf;
  --rule: #2a3948; --accent: #f07a3a; --steel: #8494a4; --good: #5bbf84; --warn: #e0a84a; --bad: #ef6b5e;
  --chip: #1e2b38; color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  background: var(--paper);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink); font-family: var(--body); font-size: 16px; line-height: 1.55;
}
.wrap { max-width: 1120px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); padding-block: 20px 56px; display: grid; gap: 28px; }
header.site { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.brand { font-family: var(--display); font-weight: 700; font-size: 26px; letter-spacing: .02em; text-transform: uppercase; display: flex; align-items: center; gap: 10px; }
.brand svg { width: 28px; height: 28px; }
.proto { font-family: var(--mono); font-size: 12px; color: var(--ink-2); border: 1px dashed var(--rule); padding: 2px 8px; border-radius: 4px; }
.search { display: flex; gap: 8px; flex-wrap: wrap; }
.search .fn { font-family: var(--mono); font-size: 12.5px; padding: 6px 10px; border-radius: 999px; background: var(--chip); color: var(--ink-2); border: 1px solid transparent; }
.search .fn.on { border-color: var(--accent); color: var(--ink); }
.crumb { font-family: var(--mono); font-size: 13px; color: var(--ink-2); }
.crumb b { color: var(--ink); font-weight: 500; }
.titlebar { display: grid; gap: 10px; }
h1 { hyphens: auto; overflow-wrap: anywhere; font-family: var(--display); font-weight: 600; font-size: clamp(34px, 5vw, 52px); line-height: 1.02; margin: 0; text-wrap: balance; }
.sub { color: var(--ink-2); max-width: 64ch; margin: 0; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { font-family: var(--mono); font-size: 12.5px; padding: 3px 9px; border-radius: 4px; background: var(--chip); }
.tag a { color: inherit; }
.main { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 20px; align-items: start; }
@media (max-width: 860px) { .main { grid-template-columns: 1fr; } }
.plate { background: var(--sheet); border: 1px solid var(--rule); border-radius: 6px; padding: 14px; display: grid; gap: 10px; min-width: 0; }
.plate-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; font-family: var(--mono); font-size: 12px; color: var(--ink-2); text-transform: uppercase; letter-spacing: .06em; }
canvas { width: 100%; display: block; }
#mech { aspect-ratio: 16 / 9; }
#plot { aspect-ratio: 16 / 7; }
.controls { display: grid; gap: 16px; }
.ctl { display: grid; gap: 4px; }
.ctl label { display: flex; justify-content: space-between; font-size: 14px; }
.ctl label span { font-family: var(--mono); color: var(--ink-2); }
input[type=range] { width: 100%; accent-color: var(--accent); }
.btns { display: flex; gap: 8px; flex-wrap: wrap; }
button { font: inherit; font-size: 14px; padding: 7px 14px; border-radius: 4px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); cursor: pointer; }
button.primary { background: var(--ink); color: var(--sheet); border-color: var(--ink); }
button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.readout { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; }
.readout div { background: var(--sheet); padding: 8px 10px; display: grid; }
.readout small { font-size: 11.5px; color: var(--ink-2); text-transform: uppercase; letter-spacing: .05em; }
.readout b { font-family: var(--mono); font-weight: 500; font-size: 17px; font-variant-numeric: tabular-nums; }
.status { font-size: 13.5px; padding: 8px 10px; border-radius: 4px; border-left: 3px solid var(--good); background: var(--chip); }
.status.warn { border-left-color: var(--warn); }
.status.bad { border-left-color: var(--bad); }
.notes { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px; }
@media (max-width: 860px) { .notes { grid-template-columns: 1fr; } }
section.note { background: var(--sheet); border: 1px solid var(--rule); border-radius: 6px; padding: 18px 20px; display: grid; gap: 10px; min-width: 0; }
section.note.wide { grid-column: 1 / -1; }
h2 { font-family: var(--display); font-weight: 600; font-size: 24px; margin: 0; letter-spacing: .01em; }
.note p { margin: 0; max-width: 66ch; }
.note ul { margin: 0; padding-left: 20px; display: grid; gap: 6px; }
.formula { font-family: var(--mono); font-size: 14px; background: var(--chip); padding: 10px 12px; border-radius: 4px; overflow-x: auto; white-space: nowrap; }
.tablewrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-2); font-weight: 500; }
.related { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); gap: 12px; }
.related a { display: grid; gap: 4px; padding: 12px 14px; border: 1px solid var(--rule); border-radius: 4px; color: var(--ink); text-decoration: none; background: var(--paper); }
.related a:hover { border-color: var(--accent); }
.related small { font-family: var(--mono); color: var(--ink-2); font-size: 12px; }
.viewtabs { display: inline-flex; border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; }
.vt { border: 0; border-radius: 0; padding: 5px 12px; font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; background: var(--sheet); color: var(--ink-2); }
.vt.on { background: var(--ink); color: var(--sheet); }
#m3d { position: relative; aspect-ratio: 16 / 9; width: 100%; border-radius: 4px; overflow: hidden; background: radial-gradient(ellipse at 50% 40%, var(--sheet), var(--chip)); touch-action: none; }
#m3d canvas { width: 100% !important; height: 100% !important; }
#m3dhint { position: absolute; left: 10px; bottom: 8px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-2); pointer-events: none; }
.print { border: 1px solid var(--good); border-radius: 6px; padding: 12px 14px; display: grid; gap: 8px; }
.print p { margin: 0; font-size: 14px; color: var(--ink-2); }
.print-badge { font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: .08em; background: var(--good); color: var(--sheet); padding: 1px 6px; border-radius: 3px; }
button:disabled { opacity: .5; cursor: not-allowed; }
.pro { border: 1px solid var(--accent); border-radius: 6px; padding: 12px 14px; display: grid; gap: 8px; }
.pro p { margin: 0; font-size: 14px; color: var(--ink-2); }
.pro-head { display: flex; align-items: center; gap: 8px; }
.pro-badge { font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: .08em; background: var(--accent); color: var(--sheet); padding: 1px 6px; border-radius: 3px; }
.pro-msg { font-size: 13px !important; color: var(--ink) !important; background: var(--chip); padding: 6px 8px; border-radius: 4px; }
footer { font-size: 13px; color: var(--ink-2); display: grid; gap: 4px; }
footer a, .note a { color: var(--ink); }
[hidden] { display: none !important; }
.brand .tagline { font-family: var(--body); font-weight: 400; font-size: 13px; text-transform: none; letter-spacing: 0; color: var(--ink-2); display: block; margin-top: 2px; }
.brand .name b { font-weight: 800; }
.brand .name i { font-weight: 500; }
.brand .name { font-family: var(--body); text-transform: none; font-size: 26px; letter-spacing: -0.03em; line-height: 1; }
.mechnav { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr)); gap: 8px; }
@media (max-width: 600px) { #plot { aspect-ratio: 4 / 3; } .mechnav button b { font-size: 17px; } }
.mechnav button { text-align: left; display: grid; gap: 2px; padding: 10px 12px; border-radius: 6px; background: var(--sheet); border: 1px solid var(--rule); min-height: 44px; }
.mechnav button b { font-family: var(--display); font-size: 19px; font-weight: 600; letter-spacing: .01em; }
.mechnav button small { font-family: var(--mono); font-size: 11.5px; color: var(--ink-2); }
.mechnav button[aria-current="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
#mech { max-height: 62vh; }
#m3d { aspect-ratio: 4 / 3; max-height: 62vh; }
.presets { display: flex; flex-wrap: wrap; gap: 6px; }
.presets button { font-size: 13px; padding: 5px 10px; }
.presets:empty { display: none; }
details.grp { border-top: 1px solid var(--rule); padding-top: 4px; }
details.grp > summary { cursor: pointer; font-family: var(--mono); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-2); min-height: 40px; display: flex; align-items: center; gap: 6px; }
details.grp > .controls { padding: 6px 0 4px; }
a.brand { color: inherit; text-decoration: none; display: flex; align-items: center; gap: 12px; }
.topnav { display: flex; gap: 6px; align-items: center; }
.topnav a { font-family: var(--mono); font-size: 13px; color: var(--ink); text-decoration: none; padding: 8px 12px; border-radius: 6px; border: 1px solid var(--rule); background: var(--sheet); min-height: 40px; display: inline-flex; align-items: center; }
.topnav a:hover { border-color: var(--accent); }
.hero { display: grid; gap: 14px; padding: 8px 0 4px; }
.hero h1 { font-size: clamp(38px, 6.4vw, 68px); max-width: 15ch; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p { margin: 0; font-size: 17px; line-height: 1.55; color: var(--ink-2); max-width: 62ch; }
.facts { display: flex; flex-wrap: wrap; gap: 8px 18px; font-family: var(--mono); font-size: 13px; color: var(--ink-2); }
.facts b { color: var(--ink); font-weight: 600; }
.finder { display: grid; gap: 12px; position: sticky; top: 0; z-index: 2; background: var(--paper); padding: 10px 0; }
.search { width: 100%; font: inherit; font-size: 16px; padding: 12px 14px; border-radius: 8px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); min-height: 48px; }
.search:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips button { font-family: var(--mono); font-size: 13px; padding: 7px 12px; border-radius: 999px; border: 1px solid var(--rule); background: var(--sheet); color: var(--ink); min-height: 40px; cursor: pointer; }
.chips button[aria-pressed="true"] { background: var(--ink); color: var(--sheet); border-color: var(--ink); }
.chips button span { opacity: .65; margin-left: 4px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr)); gap: 14px; }
.card { display: grid; grid-template-rows: auto 1fr; text-decoration: none; color: inherit; background: var(--sheet); border: 1px solid var(--rule); border-radius: 10px; overflow: hidden; transition: border-color .15s, transform .15s; }
.card:hover, .card:focus-visible { border-color: var(--accent); transform: translateY(-2px); }
.card canvas { width: 100%; aspect-ratio: 4 / 3; display: block; background: color-mix(in srgb, var(--paper) 55%, var(--sheet)); border-bottom: 1px solid var(--rule); }
.card .cb { padding: 12px 14px 14px; display: grid; gap: 6px; align-content: start; }
.card h3 { margin: 0; font-family: var(--display); font-weight: 600; font-size: 24px; line-height: 1.05; }
.card .fn { font-family: var(--mono); font-size: 12px; color: var(--accent); }
.card p { margin: 0; font-size: 14px; line-height: 1.45; color: var(--ink-2); }
.empty { font-size: 15px; color: var(--ink-2); padding: 20px 0; }
.empty[hidden] { display: none; }
.aka { margin: 0; font-family: var(--mono); font-size: 12.5px; color: var(--ink-2); }
.flinks { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.flinks a { color: var(--ink); min-height: 32px; display: inline-flex; align-items: center; }
.ctl label .lb { flex: 1; min-width: 0; font-family: var(--body); color: var(--ink); }
.ctl .nv { display: inline-flex; align-items: center; gap: 4px; font-family: var(--mono); color: var(--ink-2); }
.ctl .nv input { width: 72px; font: inherit; font-size: 14px; text-align: right; padding: 4px 6px; border: 1px solid var(--rule); border-radius: 4px; background: var(--sheet); color: var(--ink); min-height: 32px; }
.ctl .nv input:focus { outline: 2px solid var(--accent); outline-offset: 0; }
.ctl .nv small { font-size: 12px; min-width: 2ch; }
#viewMech, #viewHome { display: grid; gap: 28px; min-width: 0; }
.notes.spec { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }
.notes.spec ol { margin: 0; padding-left: 20px; display: grid; gap: 4px; }
.notes.spec .formula { margin: 0; }
.notes.spec .note { gap: 8px; align-content: start; }
.notes.spec h2 { font-size: 13px; font-family: var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-2); font-weight: 500; }
.more h2 { font-family: var(--display); font-weight: 600; font-size: 28px; margin: 0 0 12px; }
.crumb a { color: inherit; }
@media (max-width: 600px) { .finder { position: static; } .card h3 { font-size: 22px; } .topnav a { padding: 8px 10px; } }
@media (prefers-reduced-motion: reduce) { .card { transition: none; } .card:hover { transform: none; } }