/* ─────────────────────────────────────────────────────────────
   Muscle Map — thermal instrument on a cool slate panel.
   Chrome is cool; the ember ramp is the only warm colour, so
   heat on the figure always means data.
   ───────────────────────────────────────────────────────────── */
:root {
  --surface: #16212b;
  --panel:   #1b2833;
  --panel-2: #213040;
  --rule:    #2b3d4c;
  --rule-soft: #223442;

  --ink:   #e8eff4;
  --ink-2: #9fb3c2;
  --ink-3: #6b8496;

  --cool:  #7fd3f0;   /* interaction only, never data */
  --cool-dim: #3d7d95;

  /* sequential ember ramp: single hue family, lightness rises with load */
  --lv-0: #2a3a47;
  --lv-1: #5a3a22;
  --lv-2: #8a4e1e;
  --lv-3: #b8661c;
  --lv-4: #de8a2a;
  --lv-5: #f5b247;
  --lv-6: #ffd98a;

  --font: 'Archivo', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --narrow: 'Archivo', ui-sans-serif, system-ui, sans-serif;
}

* { box-sizing: border-box; }

/* Class rules that set `display` would otherwise beat the UA's [hidden] rule. */
[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.45;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
}

h1, h2, h3 { margin: 0; font-weight: 700; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}

.skip {
  position: absolute; left: 12px; top: -40px; z-index: 20;
  background: var(--cool); color: #0d1620; padding: 8px 12px;
  border-radius: 2px; text-decoration: none; font-weight: 700;
}
.skip:focus { top: 12px; }

:focus-visible {
  outline: 2px solid var(--cool);
  outline-offset: 2px;
}

/* ── masthead ─────────────────────────────────────────────── */
.masthead {
  flex: none;
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
  padding: 18px 28px 14px;
  border-bottom: 1px solid var(--rule);
}

.brand { display: flex; align-items: baseline; gap: 18px; flex-wrap: wrap; }

.brand h1 {
  font-size: 27px;
  font-weight: 800;
  font-stretch: 118%;
  letter-spacing: .005em;
  line-height: 1;
}

.brand p {
  margin: 0;
  color: var(--ink-3);
  font-size: 13.5px;
  font-stretch: 92%;
}

.tally { display: flex; align-items: baseline; gap: 8px; }
.tally-num {
  font-size: 21px; font-weight: 700; line-height: 1;
  font-stretch: 108%;
  min-width: 1.2ch; text-align: right;
}
.tally-lab {
  color: var(--ink-3); font-size: 12.5px; font-stretch: 84%;
  margin-right: 10px;
}
.tally-lab:last-of-type { margin-right: 0; }

.ghost {
  margin-left: 14px;
  background: none; border: 1px solid var(--rule);
  color: var(--ink-2); font: inherit; font-size: 12.5px;
  padding: 4px 10px; border-radius: 2px; cursor: pointer;
}
.ghost:hover { border-color: var(--cool-dim); color: var(--ink); }

/* ── shell ────────────────────────────────────────────────── */
main {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: 296px minmax(0, 1fr) 306px;
  grid-template-rows: minmax(0, 1fr);
  overflow: hidden;
}

.col { min-height: 0; padding: 18px 20px 24px; }
/* `contain` keeps a scrolled column's clipped content out of the page's own
   scroll height, so the page never scrolls past the end of the layout. */
.picker { border-right: 1px solid var(--rule); overflow-y: auto; contain: paint; }
.ledger { border-left: 1px solid var(--rule); overflow-y: auto; contain: paint; }

.col > h2 {
  font-size: 13px; font-stretch: 86%; letter-spacing: .02em;
  color: var(--ink-2);
  padding-bottom: 7px;
  border-bottom: 1px solid var(--rule-soft);
  margin-bottom: 12px;
}

/* ── session list ─────────────────────────────────────────── */
.session { margin-bottom: 22px; }
.session h2 {
  font-size: 13px; font-stretch: 86%; color: var(--ink-2);
  padding-bottom: 7px; border-bottom: 1px solid var(--rule-soft); margin-bottom: 8px;
}
.session-list { list-style: none; margin: 0; padding: 0; }
.session-row {
  display: grid; grid-template-columns: 1fr auto auto;
  align-items: center; gap: 6px;
  padding: 5px 0 5px 9px;
  border-left: 2px solid var(--cool-dim);
  margin-bottom: 3px;
}
.session-row .nm { font-size: 13px; font-stretch: 92%; }
.session-row .sets {
  display: flex; align-items: center; gap: 1px;
}
.stepper {
  width: 20px; height: 20px; padding: 0;
  background: var(--panel-2); border: 1px solid var(--rule);
  color: var(--ink-2); font: inherit; font-size: 13px; line-height: 1;
  cursor: pointer; border-radius: 2px;
}
.stepper:hover:not(:disabled) { color: var(--ink); border-color: var(--cool-dim); }
.stepper:disabled { opacity: .35; cursor: default; }
.setnum {
  min-width: 3.4ch; text-align: center; font-size: 12.5px; color: var(--ink-2);
}
.drop {
  width: 20px; height: 20px; padding: 0; margin-left: 4px;
  background: none; border: none; color: var(--ink-3);
  font: inherit; font-size: 15px; line-height: 1; cursor: pointer;
}
.drop:hover { color: var(--lv-5); }

/* ── library ──────────────────────────────────────────────── */
.controls { margin-bottom: 12px; }

#search {
  width: 100%; padding: 7px 9px;
  background: var(--panel); border: 1px solid var(--rule);
  color: var(--ink); font: inherit; font-size: 13px; border-radius: 2px;
}
#search::placeholder { color: var(--ink-3); }

.gear { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 8px; }
.gear button {
  background: none; border: 1px solid var(--rule-soft);
  color: var(--ink-3); font: inherit; font-size: 11.5px; font-stretch: 84%;
  padding: 3px 8px; border-radius: 2px; cursor: pointer;
}
.gear button:hover { color: var(--ink-2); border-color: var(--rule); }
.gear button[aria-pressed="true"] {
  color: var(--surface); background: var(--cool); border-color: var(--cool);
  font-weight: 700;
}

.mfilter {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  margin-top: 8px; padding: 4px 4px 4px 9px;
  border-left: 2px solid var(--lv-4);
  font-size: 12px; font-stretch: 90%; color: var(--ink-2);
}
.mfilter button {
  background: none; border: none; color: var(--ink-3);
  font: inherit; font-size: 15px; line-height: 1; cursor: pointer; padding: 0 4px;
}
.mfilter button:hover { color: var(--lv-5); }

.group-h {
  font-size: 11.5px; font-stretch: 84%; color: var(--ink-3);
  padding: 12px 0 5px; margin: 0;
  position: sticky; top: -18px;
  background: var(--surface);
  border-bottom: 1px solid var(--rule-soft);
}
.group-h span { color: var(--rule); margin-left: 5px; }

.ex-list { list-style: none; margin: 0; padding: 0; }

.ex {
  display: flex; align-items: center; gap: 8px;
  padding: 4px 6px 4px 4px; margin: 1px 0;
  cursor: pointer; border-radius: 2px;
  font-size: 13px; font-stretch: 94%;
}
.ex:hover { background: var(--panel); }
.ex input { position: absolute; opacity: 0; pointer-events: none; }
.ex .box {
  flex: none; width: 13px; height: 13px;
  border: 1px solid var(--rule); border-radius: 2px;
  display: grid; place-items: center;
}
.ex input:checked + .box { background: var(--cool); border-color: var(--cool); }
.ex input:checked + .box::after {
  content: ''; width: 6px; height: 3px;
  border-left: 2px solid var(--surface); border-bottom: 2px solid var(--surface);
  transform: translateY(-1px) rotate(-45deg);
}
.ex input:focus-visible + .box { outline: 2px solid var(--cool); outline-offset: 2px; }
.ex input:checked ~ .lab { color: var(--ink); font-weight: 600; }
.ex .lab { color: var(--ink-2); }
.ex .gear-tag {
  margin-left: auto; font-size: 10.5px; font-stretch: 80%;
  color: var(--ink-3); letter-spacing: .02em;
}
/* When the list is ranked by one muscle, the tag is that muscle's share. */
.ex .gear-tag.lv-1 { color: #a97a52; }
.ex .gear-tag.lv-2 { color: var(--lv-3); }
.ex .gear-tag.lv-3 { color: var(--lv-4); }
.ex .gear-tag.lv-4 { color: var(--lv-4); }
.ex .gear-tag.lv-5 { color: var(--lv-5); }
.ex .gear-tag.lv-6 { color: var(--lv-6); }
.empty { color: var(--ink-3); font-size: 13px; padding: 14px 2px; }

/* ── stage ────────────────────────────────────────────────── */
.stage {
  display: flex; flex-direction: column; align-items: center;
  gap: 10px; overflow: hidden;
}

.stage-note {
  flex: none; font-size: 13px; font-stretch: 90%; color: var(--ink-3);
  min-height: 20px; text-align: center;
}
.stage-note b { color: var(--lv-6); font-weight: 700; }

.figures {
  flex: 1 1 auto; min-height: 0; width: 100%;
  display: flex; gap: clamp(8px, 3vw, 48px);
  align-items: stretch; justify-content: center;
}
.figures figure {
  margin: 0; display: flex; flex-direction: column; min-height: 0;
  align-items: center; gap: 8px;
  flex: 1 1 0; max-width: 300px;
}
.slot { flex: 1 1 auto; min-height: 0; width: 100%; position: relative; }
.figures figcaption {
  flex: none; font-size: 11.5px; font-stretch: 84%; color: var(--ink-3);
  letter-spacing: .06em;
}

.figure { position: absolute; inset: 0; width: 100%; height: 100%; }
.figure .body { fill: #1e2b36; }
.figure .detail {
  fill: none; stroke: #16212b; stroke-width: .8; opacity: .75;
  stroke-linecap: round;
}
.figure .muscle {
  fill: var(--lv-0);
  stroke: #16212b; stroke-width: .6;
  transition: fill .28s ease;
}
.figure .muscle.lv-1 { fill: var(--lv-1); }
.figure .muscle.lv-2 { fill: var(--lv-2); }
.figure .muscle.lv-3 { fill: var(--lv-3); }
.figure .muscle.lv-4 { fill: var(--lv-4); }
.figure .muscle.lv-5 { fill: var(--lv-5); }
.figure .muscle.lv-6 { fill: var(--lv-6); }
.figure .muscle { cursor: pointer; }
.figure .muscle.hi { stroke: var(--cool); stroke-width: 1.4; }
.figure .muscle.picked { stroke: var(--lv-5); stroke-width: 1.4; }

/* ── scale bar ────────────────────────────────────────────── */
.scalebar {
  flex: none; width: 100%; max-width: 460px;
  border-top: 1px solid var(--rule-soft); padding-top: 12px;
  display: flex; flex-direction: column; align-items: center; gap: 9px;
}
.legend { display: flex; align-items: center; gap: 9px; }
.legend-end { font-size: 11px; font-stretch: 84%; color: var(--ink-3); }
.ramp { display: flex; gap: 2px; }
.ramp i {
  display: block; width: 26px; height: 7px; border-radius: 1px;
}

.modes { display: flex; gap: 2px; }
.modes button {
  background: var(--panel); border: 1px solid var(--rule);
  color: var(--ink-3); font: inherit; font-size: 12px; font-stretch: 88%;
  padding: 4px 12px; cursor: pointer; border-radius: 2px;
}
.modes button[aria-checked="true"] { color: var(--ink); border-color: var(--cool-dim); background: var(--panel-2); }

.mode-hint {
  margin: 0; max-width: 44ch; text-align: center;
  font-size: 11.5px; font-stretch: 90%; line-height: 1.5; color: var(--ink-3);
}

/* ── ledger ───────────────────────────────────────────────── */
.ledger-sub {
  margin: -6px 0 14px; font-size: 12px; color: var(--ink-3); max-width: 34ch;
}
.meters {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column;
}
.meter { display: block; }
.m-row {
  display: grid; grid-template-columns: 1fr 3.6ch;
  align-items: baseline; gap: 8px;
  width: 100%; padding: 5px 0 6px;
  background: none; border: none; font: inherit; text-align: left;
  color: inherit; cursor: pointer;
}
.m-row:hover .m-name { color: var(--ink); }
.m-row[aria-pressed="true"] .m-name { color: var(--lv-5); }
.m-name { font-size: 12.5px; font-stretch: 90%; color: var(--ink-2); }
.m-val { font-size: 12px; text-align: right; color: var(--ink-3); }
.meter.on .m-val { color: var(--ink-2); }
.m-track {
  display: block;
  height: 5px; background: var(--rule-soft); border-radius: 1px; overflow: hidden;
}
.m-fill {
  display: block; height: 100%; width: 0;
  border-radius: 0 4px 4px 0;
  background: var(--lv-0);
  transition: width .3s ease, background-color .28s ease;
}
.m-fill.lv-1 { background: var(--lv-1); }
.m-fill.lv-2 { background: var(--lv-2); }
.m-fill.lv-3 { background: var(--lv-3); }
.m-fill.lv-4 { background: var(--lv-4); }
.m-fill.lv-5 { background: var(--lv-5); }
.m-fill.lv-6 { background: var(--lv-6); }

.untouched {
  margin-top: 18px; padding-top: 12px; border-top: 1px solid var(--rule-soft);
}
.untouched h3 { font-size: 11.5px; font-stretch: 84%; color: var(--ink-3); margin-bottom: 5px; }
.untouched p { margin: 0; font-size: 12.5px; font-stretch: 90%; color: var(--ink-2); line-height: 1.7; }
.untouched .chip {
  background: none; border: none; padding: 0; margin: 0;
  font: inherit; color: var(--ink-2); cursor: pointer;
  border-bottom: 1px solid var(--rule);
}
.untouched .chip:hover { color: var(--lv-5); border-bottom-color: var(--lv-4); }
.untouched-tip { margin-top: 7px !important; color: var(--ink-3) !important; font-size: 11.5px !important; }

/* ── tooltip ──────────────────────────────────────────────── */
.tip {
  position: fixed; z-index: 30; pointer-events: none;
  background: #0f1922; border: 1px solid var(--rule);
  padding: 8px 10px; border-radius: 3px; max-width: 230px;
  box-shadow: 0 6px 22px rgba(0,0,0,.45);
}
.tip .t-name { font-size: 12.5px; font-weight: 700; font-stretch: 94%; }
.tip .t-score { font-size: 11.5px; color: var(--ink-3); margin-bottom: 5px; }
.tip ul { list-style: none; margin: 0; padding: 0; }
.tip li {
  display: flex; justify-content: space-between; gap: 10px;
  font-size: 11.5px; font-stretch: 88%; color: var(--ink-2);
}
.tip li span { color: var(--ink-3); }

/* The three columns each scroll on their own, so the page never does. */
@media (min-width: 1081px) {
  html, body { overflow: hidden; }
}

/* ── narrow screens ──────────────────────────────────────── */
@media (max-width: 1080px) {
  main { grid-template-columns: 264px minmax(0, 1fr); grid-template-rows: auto auto; }
  body { display: block; height: auto; }
  .col { overflow: visible; }
  #library { max-height: 58vh; overflow-y: auto; contain: paint; }
  .group-h { top: 0; }
  .ledger {
    grid-column: 1 / -1; border-left: none; border-top: 1px solid var(--rule);
  }
  .meters { display: block; columns: 2; column-gap: 26px; }
  .stage { overflow: visible; }
  .figures { height: 58vh; }
}

@media (max-width: 720px) {
  main { grid-template-columns: 1fr; grid-template-rows: none; }
  body { display: block; height: auto; }
  .col { overflow: visible; }

  /* The body map leads; the long library sits below it and scrolls in place. */
  .stage  { order: 1; }
  .ledger { order: 2; border-top: 1px solid var(--rule); }
  .picker { order: 3; border-right: none; border-top: 1px solid var(--rule); }

  #library { max-height: 52vh; overflow-y: auto; contain: paint; }
  .group-h { top: 0; }

  .figures { gap: 4px; height: 52vh; }
  .meters { columns: 1; }
  .masthead { padding: 14px 18px 12px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}