/* =========================================================
   Chapter 03 — Anatomy labs (지오메트리 · 림 · 서스펜션)
   Namespaced .alab-*  — colors only via design tokens
   ========================================================= */

/* ---------- shared ---------- */
.alab { --alab-pad: 14px; }
.alab .alab-stage {
  background: radial-gradient(circle at 1px 1px, var(--line) 1px, transparent 0) 0 0 / 22px 22px, var(--surface-2);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; min-width: 0;
}
.alab svg { width: 100%; height: auto; }
.alab-ctl { min-width: 0; }
.alab-field { margin-bottom: 12px; padding: 6px 10px 8px; border-radius: var(--radius-sm); border: 1px solid transparent; transition: background .2s, border-color .2s; }
.alab-field.is-hl { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.alab-field-top { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.alab-field-top label { font-size: .86rem; font-weight: 700; color: var(--ink-2); }
.alab-out { font-family: var(--mono); font-size: .86rem; font-weight: 600; color: var(--accent-ink); white-space: nowrap; }
.alab-field input[type="range"] { margin: 4px 0 0; }
.alab-chipset { margin: 0 0 14px; min-width: 0; }
.alab-chips-label { display: block; font-size: .8rem; font-weight: 700; color: var(--muted); margin-bottom: 6px; }
.alab-chipset .chip { padding: 6px 12px; font-size: .82rem; }
.alab-note {
  margin-top: 16px; padding: 14px 16px; border-radius: var(--radius-sm); background: var(--bg-2);
  font-size: .9rem; line-height: 1.65; color: var(--ink-2); min-height: 3.4em;
}
.alab-note b { color: var(--ink); }
.alab-note b.bad { color: var(--red); }
.alab-note b.good { color: var(--green); }
.alab-note .muted { color: var(--muted); }
.alab-fine { font-size: .78rem; color: var(--muted); margin: 10px 0 0; line-height: 1.55; }
.alab-cap { font-size: .8rem; color: var(--muted); margin: 6px 4px 0; line-height: 1.5; }

/* ---------- 1. Geometry lab ---------- */
.alab-geo-grid { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); gap: 20px; align-items: start; }
@media (max-width: 900px) { .alab-geo-grid { grid-template-columns: minmax(0, 1fr); } }
.alab-presets .chip-row { gap: 6px; }
.alab-geo-svg { overflow: visible; }
.alab-geo-svg .alab-ground { stroke: var(--line-2); stroke-width: 6; }
.alab-geo-svg .alab-tire { fill: none; stroke: var(--ink); stroke-width: 30; opacity: .88; }
.alab-geo-svg .alab-rim { fill: none; stroke: color-mix(in srgb, var(--ink) 45%, var(--surface)); stroke-width: 8; }
.alab-geo-svg .alab-spoke { stroke: color-mix(in srgb, var(--ink) 40%, var(--surface)); stroke-width: 2.4; fill: none; }
.alab-geo-svg .alab-hub { fill: var(--ink-2); }
.alab-geo-svg .alab-frame { fill: none; stroke: var(--ink-2); stroke-width: 26; stroke-linecap: round; stroke-linejoin: round; }
.alab-geo-svg .alab-ht { stroke: var(--ink); stroke-width: 48; stroke-linecap: round; }
.alab-geo-svg .alab-forkf { fill: var(--teal); }
.alab-geo-svg .alab-forkc { stroke: var(--teal); stroke-linecap: round; fill: none; }
.alab-geo-svg .alab-stan { stroke: color-mix(in srgb, var(--teal) 45%, var(--surface)); stroke-linecap: butt; fill: none; }
.alab-geo-svg .alab-ring { fill: none; stroke: var(--ink-2); stroke-width: 12; stroke-dasharray: 7 3; }
.alab-geo-svg .alab-crank { stroke: var(--ink); stroke-linecap: round; fill: none; }
.alab-geo-svg .alab-comp { stroke: var(--ink); stroke-linecap: round; fill: none; opacity: .85; }
.alab-geo-svg .alab-saddle { fill: var(--ink); }
.alab-geo-svg .alab-bar { fill: none; stroke: var(--ink); stroke-width: 24; stroke-linecap: round; stroke-linejoin: round; }
.alab-geo-svg .alab-hood { fill: var(--ink-2); }
.alab-geo-svg .alab-fork { fill: none; stroke: var(--teal); stroke-width: 24; stroke-linecap: round; }
.alab-geo-svg .alab-axis { stroke: var(--teal); stroke-width: 5; stroke-dasharray: 22 16; }
.alab-geo-svg .alab-bb { fill: var(--accent); stroke: var(--surface); stroke-width: 6; }
.alab-geo-svg .alab-cp { fill: var(--ink); }
.alab-geo-svg .alab-ap { fill: var(--teal); }
.alab-geo-svg .alab-ext { stroke: var(--line-2); stroke-width: 4; stroke-dasharray: 14 12; fill: none; }
.alab-geo-svg .alab-dl { stroke: var(--accent); stroke-width: 6; fill: none; }
.alab-geo-svg .alab-dl-teal { stroke: var(--teal); }
.alab-geo-svg .alab-hit { stroke: transparent; stroke-width: 70; fill: none; pointer-events: stroke; }
.alab-geo-svg .alab-dim { cursor: help; transition: opacity .2s; }
.alab-geo-svg .alab-dim-t {
  font: 700 46px var(--font); fill: var(--accent-ink);
  paint-order: stroke; stroke: var(--surface-2); stroke-width: 12px; stroke-linejoin: round;
}
.alab-geo-svg.alab-hl-on .alab-dim:not(.is-hl) { opacity: .18; }
.alab-geo-svg .alab-dim.is-hl .alab-dl { stroke-width: 10; }
.alab-geo-svg .alab-dim.is-hl .alab-dim-t { font-size: 56px; fill: var(--ink); }
.alab-geo-read { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; margin-top: 10px; }
.alab-geo-row {
  display: flex; justify-content: space-between; align-items: baseline; gap: 6px; flex-wrap: wrap;
  border: 1px solid var(--line); background: var(--surface); border-radius: 10px; padding: 7px 10px; text-align: left; min-width: 0;
  transition: border-color .2s, background .2s;
}
.alab-geo-row .k { font-size: .78rem; font-weight: 700; color: var(--muted); }
.alab-geo-row .v { font-family: var(--mono); font-size: .84rem; font-weight: 600; color: var(--ink); }
.alab-geo-row:hover, .alab-geo-row.is-hl { border-color: var(--accent); background: var(--accent-soft); }
.alab-geo-row[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.alab-geo-row[data-dim="trail"] { border-color: color-mix(in srgb, var(--teal) 50%, var(--line)); }
@media (max-width: 520px) { .alab-geo-read { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.alab-gauge { margin-top: 18px; }
.alab-gauge-track { position: relative; height: 30px; border-radius: 999px; overflow: hidden; background: var(--bg-2); }
.alab-gauge-track .z {
  position: absolute; top: 0; bottom: 0; left: var(--a); width: calc(var(--b) - var(--a));
  display: grid; place-items: center; font-size: .72rem; font-weight: 700; color: var(--ink-2); white-space: nowrap; overflow: hidden;
}
.alab-gauge-track .z1 { background: var(--blue-soft); }
.alab-gauge-track .z2 { background: var(--green-soft); }
.alab-gauge-track .z3 { background: var(--gold-soft); }
.alab-gauge-track .z4 { background: var(--violet-soft); }
.alab-gauge-mark {
  position: absolute; top: 2px; bottom: 2px; width: 6px; margin-left: -3px; border-radius: 3px; background: var(--ink);
  box-shadow: 0 0 0 3px var(--surface); transition: left .35s cubic-bezier(.2,.8,.2,1);
}
.alab-gauge-mark.bump { animation: alab-pop .35s ease; }
@keyframes alab-pop { 50% { transform: scaleY(1.25); } }
.alab-gauge-scale { display: flex; justify-content: space-between; font-size: .72rem; color: var(--muted); font-family: var(--mono); margin-top: 4px; }
.alab-formula { font-size: .8rem; color: var(--ink-2); margin: 10px 0 0; overflow-wrap: anywhere; line-height: 1.6; }
.alab-formula b { color: var(--teal); }
@media (max-width: 520px) { .alab-gauge-track .z { font-size: .62rem; } }

/* ---------- 2. Rim lab ---------- */
.alab-rim-top { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 20px; align-items: start; }
@media (max-width: 860px) { .alab-rim-top { grid-template-columns: minmax(0, 1fr); } .alab-rim-stage { order: -1; } }
.alab-wind-btn[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.alab-rim-svg text { font-family: var(--font); }
.alab-rim-t { font-size: 12px; fill: var(--muted); }
.alab-rim-t.strong { font-weight: 800; fill: var(--ink); font-size: 13px; }
.alab-rim-t.force { fill: var(--red); font-weight: 800; }
.alab-rim-t.wind { fill: var(--blue); font-weight: 800; }
.alab-stream { fill: none; stroke: var(--blue); stroke-width: 1.6; opacity: .55; stroke-dasharray: 16 10; animation: alab-flow 1.1s linear infinite; }
.alab-wake-l { fill: none; stroke: var(--muted); stroke-width: 1.4; stroke-dasharray: 5 6; animation: alab-flow .6s linear infinite; }
.alab-flow.still .alab-stream, .alab-wake.still .alab-wake-l { animation: none; }
@keyframes alab-flow { to { stroke-dashoffset: -26; } }
.alab-rim-body { stroke: var(--ink); stroke-width: 1.2; transition: fill .3s; }
.alab-rim-body.d1 { fill: var(--muted); }
.alab-rim-body.d2 { fill: var(--teal); }
.alab-rim-body.d3 { fill: var(--accent); }
.alab-tire-sec { fill: var(--ink); }
.alab-tire-in { fill: none; stroke: var(--ink-2); stroke-width: 1; opacity: .6; }
.alab-spoke { stroke: var(--line-2); stroke-width: 2.5; }
.alab-rim-dim { stroke: var(--ink-2); stroke-width: 1.4; fill: none; }
.alab-cw-arrow { stroke: var(--blue); stroke-width: 2.4; fill: none; }
.alab-cw-head { fill: var(--blue); }
.alab-force { stroke: var(--red); stroke-width: 5; fill: none; stroke-linecap: round; }
.alab-force-head { fill: var(--red); }
.alab-cw { animation: alab-fade .3s ease; }
@keyframes alab-fade { from { opacity: 0; } }

.alab-meters { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 16px; }
@media (max-width: 700px) { .alab-meters { grid-template-columns: minmax(0, 1fr); } }
.alab-meter { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 14px; transition: border-color .2s; }
.alab-meter.is-on { border-color: var(--mc); }
.alab-meter-top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.alab-meter .n { font-size: .82rem; font-weight: 700; color: var(--ink-2); }
.alab-meter .v { font-family: var(--mono); font-size: 1.05rem; color: var(--ink); white-space: nowrap; }
.alab-meter-track { height: 10px; border-radius: 999px; background: var(--bg-2); overflow: hidden; margin: 8px 0 6px; }
.alab-meter-track i { display: block; height: 100%; width: 0; background: var(--mc); border-radius: 999px; transition: width .4s cubic-bezier(.2,.8,.2,1); }
.alab-meter .s { font-size: .72rem; color: var(--muted); line-height: 1.4; display: block; }
.alab-warn-inline { display: block; margin-top: 6px; color: var(--ink-2); }

/* ---------- 3. Fork lab ---------- */
.alab-fork-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 20px; align-items: start; }
@media (max-width: 860px) { .alab-fork-grid { grid-template-columns: minmax(0, 1fr); } }
.alab-fork-svg { max-height: 540px; margin: 0 auto; }
.alab-fork-svg text { font-family: var(--font); }
.alab-f-ground { fill: var(--bg-2); stroke: var(--line-2); }
.alab-f-steer { fill: var(--muted); }
.alab-f-crown { fill: var(--ink-2); }
.alab-f-stan { fill: var(--gold); }
.alab-f-grad { stroke: var(--ink); stroke-width: 1.2; opacity: .55; }
.alab-f-low { fill: var(--ink); }
.alab-f-arch { fill: none; stroke: var(--ink); stroke-width: 16; }
.alab-f-seal { fill: var(--accent); }
.alab-f-axle { stroke: var(--muted); stroke-width: 7; stroke-linecap: round; }
.alab-f-tire { fill: var(--ink-2); opacity: .55; }
.alab-f-hub { fill: var(--muted); }
.alab-f-rotor { fill: var(--muted); opacity: .8; }
.alab-f-knob.comp { fill: var(--teal); transition: fill .2s; }
.alab-f-knob.comp.locked { fill: var(--red); }
.alab-f-knob.air { fill: var(--blue); }
.alab-f-knob.reb { fill: var(--red); }
.alab-f-pos { fill: var(--blue); }
.alab-f-neg { fill: var(--violet); opacity: .55; }
.alab-f-piston { fill: var(--accent); }
.alab-f-shaft { stroke: var(--blue); stroke-width: 3; }
.alab-f-shaft.d { stroke: var(--teal); }
.alab-f-cart { fill: var(--teal-soft); stroke: var(--teal); stroke-width: 1.5; }
.alab-f-dpiston { fill: var(--teal); }
.alab-f-oring { fill: var(--red); stroke: var(--surface); stroke-width: 1; }
.alab-f-t { font-size: 12px; fill: var(--ink-2); font-weight: 700; }
.alab-f-t.acc { fill: var(--accent-ink); }
.alab-f-t.teal { fill: var(--teal); }
.alab-f-t.lock { fill: var(--red); font-size: 11px; }
.alab-f-t.oring { fill: var(--red); font-size: 11px; }
.alab-f-t.bottom { fill: var(--red); font-size: 18px; font-weight: 800; opacity: 0; transition: opacity .2s; paint-order: stroke; stroke: var(--surface-2); stroke-width: 5px; }
.alab-f-t.bottom.show { opacity: 1; }

.alab-sag { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 14px; margin: 4px 0 14px; }
.alab-sag-top { display: flex; justify-content: space-between; align-items: baseline; font-size: .86rem; font-weight: 700; color: var(--ink-2); }
.alab-sag-top b { font-family: var(--mono); color: var(--ink); font-size: 1rem; }
.alab-sag-track { position: relative; height: 26px; background: var(--bg-2); border-radius: 8px; margin-top: 8px; }
.alab-sag-track span { position: absolute; top: 0; bottom: 0; display: grid; place-items: center; font-size: .66rem; font-weight: 700; color: var(--ink-2); overflow: hidden; white-space: nowrap; opacity: .55; transition: opacity .2s; }
.alab-sag-track .zx { background: var(--blue-soft); border-radius: 8px 0 0 8px; }
.alab-sag-track .zt { background: var(--green-soft); border-radius: 0 8px 8px 0; }
.alab-sag[data-d="xc"] .zx, .alab-sag[data-d="trail"] .zt { opacity: 1; box-shadow: inset 0 0 0 2px var(--ink-2); }
.alab-sag-track i { position: absolute; top: -4px; bottom: -4px; width: 6px; margin-left: -3px; border-radius: 3px; background: var(--red); transition: left .3s ease, background .2s; box-shadow: 0 0 0 2px var(--surface); }
.alab-sag-track i[data-state="ok"] { background: var(--green); }
.alab-sag-scale { display: flex; justify-content: space-between; font-family: var(--mono); font-size: .68rem; color: var(--muted); margin-top: 4px; }
.alab-sag-msg { font-size: .82rem; color: var(--ink-2); margin: 8px 0 0; line-height: 1.5; }
.alab-rec { margin: -4px 0 14px 10px; }

.alab-fork-run { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 10px 16px; margin-top: 16px; }
.alab-fork-run .alab-chipset { margin: 0; }
.alab-run { white-space: nowrap; }
.alab.is-running .alab-run { opacity: .75; }
.alab-trace-wrap { margin-top: 14px; padding: 6px 8px; }
.alab-trace text { font-family: var(--mono); }
.alab-tr-t { font-size: 11px; fill: var(--muted); }
.alab-tr-t.sag { fill: var(--teal); font-weight: 600; }
.alab-tr-zone { fill: var(--green-soft); }
.alab-tr-bottom { fill: var(--red-soft); }
.alab-tr-grid { stroke: var(--line); stroke-width: 1; }
.alab-tr-sag { stroke: var(--teal); stroke-width: 1.5; stroke-dasharray: 6 5; }
.alab-tr-bump { fill: var(--gold); }
.alab-trace-line { fill: none; stroke: var(--accent); stroke-width: 2.6; stroke-linejoin: round; stroke-linecap: round; }
.alab-trace-dot { fill: var(--accent); stroke: var(--surface); stroke-width: 2; }
.alab-fork-outs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin-top: 12px; }
.alab-fork-outs > div { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 10px 12px; min-width: 0; }
.alab-fork-outs .lab { display: block; font-size: .72rem; color: var(--muted); font-weight: 700; }
.alab-fork-outs b { font-family: var(--mono); font-size: .92rem; color: var(--ink); overflow-wrap: anywhere; }
@media (max-width: 560px) { .alab-fork-outs { grid-template-columns: minmax(0, 1fr); } .alab-run { width: 100%; justify-content: center; } }

@media (max-width: 560px) {
  .alab-geo-svg .alab-dim-t { font-size: 64px; stroke-width: 16px; }
  .alab-geo-svg .alab-dim.is-hl .alab-dim-t { font-size: 74px; }
  .alab-tr-t { font-size: 20px; }
  .alab-trace-line { stroke-width: 4; }
  .alab-rim-t { font-size: 16px; }
  .alab-rim-t.strong { font-size: 17px; }
}
@media (prefers-reduced-motion: reduce) {
  .alab-stream, .alab-wake-l { animation: none; }
  .alab-gauge-mark, .alab-sag-track i, .alab-meter-track i { transition: none; }
}