/* 248 Anthems — /labs · "Anthem Labs"
 * Loaded after /css/style.css. Reuses the flagship's tokens, header, section
 * heads, stripe, buttons and footer.
 *
 * Direction: this page is a workshop, not a defence. Three instruments you can
 * play sit at the top; the research that supports them sits in the middle,
 * stated confidently; the caveats live in one condensed appendix at the
 * bottom, complete but not the lead.
 */

/* ---------- hero ---------- */
.labs-hero { padding-block: clamp(2.5rem, 7vh, 4.5rem) clamp(1.6rem, 4vh, 2.6rem); }
.labs-hero h1 { font-weight: 700; font-size: clamp(2.8rem, 8vw, 5.5rem); line-height: .92; max-width: 15ch; }
.labs-hero h1 .sig { color: var(--orange); }
.labs-lede { color: var(--ink-2); font-size: 1.125rem; max-width: 54ch; margin-top: 1.6rem; }

.labs-jump { display: flex; flex-wrap: wrap; gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: clamp(1.8rem, 4vh, 2.6rem); }
.labs-jump a { flex: 1 1 200px; background: var(--bone); padding: 1rem 1.2rem 1.2rem; text-decoration: none; transition: background .18s ease; }
.labs-jump a:hover { background: var(--graphite); color: var(--bone); }
.labs-jump .mono { color: var(--ink-3); display: block; }
.labs-jump a:hover .mono { color: var(--lime); }
.labs-jump h2 { font-size: 1.35rem; margin-top: .35rem; letter-spacing: .02em; }

/* ---------- shared instrument shell (dark) ---------- */
.lab { background: var(--charcoal); color: var(--d-fg); }
.lab-inner { padding-block: clamp(2.5rem, 6vh, 4rem); }
.lab .sec-display { color: var(--d-fg); }
.lab .sec-sub { color: var(--d-dim); }
.lab :focus-visible { outline-color: var(--lime); }
.lab-alt { background: var(--graphite); }
.frame { border: 1px solid var(--d-line); padding: clamp(1rem, 2.6vw, 2rem); margin-top: clamp(1.4rem, 3vh, 2rem); }
.lab-note { margin-top: 1.4rem; color: var(--d-dim); font-size: .95rem; max-width: 74ch; }
.lab-note strong { color: var(--bone); font-weight: 620; }
.lab-cite {
  display: block; margin-top: .9rem; font-family: var(--font-mono); font-size: .6875rem;
  letter-spacing: .02em; line-height: 1.7; color: rgba(246,244,241,.5);
}
.lab-cite::before { content: "SRC — "; letter-spacing: .1em; font-weight: 500; }

.btn-lab {
  display: inline-flex; align-items: center; gap: .7rem;
  font-family: var(--font-mono); font-weight: 500; font-size: .75rem;
  letter-spacing: .12em; text-transform: uppercase;
  background: var(--lime); color: var(--charcoal); padding: .9rem 1.5rem;
  transition: transform .18s ease;
}
.btn-lab:hover { transform: translateY(-2px); }
.btn-lab svg { width: 13px; height: 13px; }
.btn-ghost {
  font-family: var(--font-mono); font-weight: 500; font-size: .6875rem;
  letter-spacing: .12em; text-transform: uppercase;
  border: 1px solid var(--d-line); color: var(--d-dim); padding: .6rem 1rem;
  transition: border-color .18s ease, color .18s ease;
}
.btn-ghost:hover, .btn-ghost[aria-pressed="true"] { border-color: var(--lime); color: var(--lime); }

/* ═════════ 01 · TAP YOUR TEMPO ═════════ */
.tap-grid { display: grid; grid-template-columns: minmax(0, 320px) 1fr; gap: clamp(1.4rem, 3.5vw, 2.6rem); align-items: stretch; }
.tap-pad {
  position: relative; width: 100%; min-height: 250px;
  display: grid; place-content: center; justify-items: center; gap: .5rem;
  border: 2px solid var(--lime); background: rgba(204,255,0,.05);
  color: var(--bone); cursor: pointer; user-select: none;
  transition: background .1s ease;
}
.tap-pad:hover { background: rgba(204,255,0,.1); }
.tap-pad.hit { background: rgba(204,255,0,.32); }
.tap-pad-ring { width: 92px; height: 92px; }
.tap-pad-ring circle { fill: none; stroke: var(--lime); stroke-width: 2; }
.tap-pad-ring .halo { stroke-opacity: .35; transform-origin: 50% 50%; }
.tap-pad.hit .halo { transform: scale(1.22); stroke-opacity: .9; }
.tap-pad-label { font-family: var(--font-display); font-weight: 600; font-size: 1.7rem; text-transform: uppercase; letter-spacing: .04em; }
.tap-pad-hint { font-family: var(--font-mono); font-size: .625rem; letter-spacing: .12em; text-transform: uppercase; color: var(--d-dim); }

.tap-out { display: flex; flex-direction: column; gap: 1.2rem; }
.tap-readout { display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.tap-bpm {
  font-family: var(--font-display); font-weight: 700; line-height: .85;
  font-size: clamp(4rem, 13vw, 8rem); color: var(--lime); font-variant-numeric: tabular-nums;
}
.tap-bpm.idle { color: rgba(246,244,241,.22); }
.tap-unit { font-family: var(--font-mono); font-size: .75rem; letter-spacing: .18em; color: var(--d-dim); }
.tap-verdict { font-size: 1.02rem; color: var(--bone); min-height: 3.2em; max-width: 46ch; }
.tap-verdict .quiet { color: var(--d-dim); }
.tap-verdict b { color: var(--lime); font-weight: 600; }

#tap-scale { display: block; width: 100%; height: auto; }
.ts-track { fill: rgba(246,244,241,.13); }
.ts-band { fill: var(--lime); fill-opacity: .3; stroke: var(--lime); stroke-opacity: .8; stroke-width: 1; }
.ts-anchor { stroke: var(--bone); stroke-width: 1.4; stroke-dasharray: 3 3; }
.ts-you { fill: var(--lime); stroke: var(--charcoal); stroke-width: 2; }
.ts-label { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em; fill: var(--d-dim); }
.ts-label-hi { fill: var(--lime); }
.ts-label-bone { fill: var(--bone); }
.tap-actions { display: flex; gap: .8rem; flex-wrap: wrap; align-items: center; }
@media (max-width: 820px) { .tap-grid { grid-template-columns: 1fr; } .tap-pad { min-height: 190px; } }

/* ═════════ 02 · FEEL THE RATIO ═════════ */
.ratio-grid { display: grid; grid-template-columns: minmax(0, 340px) 1fr; gap: clamp(1.4rem, 3.5vw, 2.6rem); align-items: start; }
.tempo-picker { display: grid; gap: 1px; background: var(--d-line); border: 1px solid var(--d-line); }
.tempo-opt {
  background: var(--charcoal); text-align: left; padding: .9rem 1.1rem;
  display: grid; grid-template-columns: auto 1fr; gap: .3rem 1rem; align-items: baseline;
  color: var(--d-dim); transition: background .18s ease;
}
.lab-alt .tempo-opt { background: var(--graphite); }
.tempo-opt:hover { background: rgba(246,244,241,.07); }
.tempo-opt[aria-pressed="true"] { background: var(--lime); color: var(--charcoal); }
.tempo-opt .to-name { font-family: var(--font-display); font-weight: 600; font-size: 1.5rem; letter-spacing: .02em; color: var(--bone); }
.tempo-opt[aria-pressed="true"] .to-name { color: var(--charcoal); }
.tempo-opt .to-desc { font-size: .8rem; grid-column: 2; }
.tempo-opt .to-tag { grid-column: 1 / -1; font-family: var(--font-mono); font-size: .5625rem; letter-spacing: .12em; text-transform: uppercase; opacity: .8; }

.swing-stage { border: 1px solid var(--d-line); padding: clamp(1rem, 2.4vw, 1.6rem); }
#swing-svg { display: block; width: 100%; height: auto; }
.sw-cell { fill: rgba(246,244,241,.22); }
.sw-cell.down { fill: rgba(204,255,0,.3); }
.sw-cell.on { fill: var(--bone); }
.sw-cell.down.on { fill: var(--lime); }
.sw-axis { stroke: rgba(246,244,241,.3); stroke-width: 1; }
.sw-beat { stroke: rgba(246,244,241,.34); stroke-width: 1; stroke-dasharray: 2 4; }
.sw-beat.key { stroke: var(--orange); stroke-dasharray: none; stroke-width: 1.6; }
.sw-label { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em; fill: var(--d-dim); }
.sw-label-hi { fill: var(--bone); }
.sw-label-sig { fill: var(--orange); }
.sw-head { stroke: var(--lime); stroke-width: 2.5; }

.swing-controls { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; margin-top: 1.2rem; }
.swing-readout { font-family: var(--font-mono); font-size: .6875rem; letter-spacing: .08em; color: var(--d-dim); font-variant-numeric: tabular-nums; }
.swing-readout b { color: var(--lime); font-weight: 500; }
.ratio-figs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--d-line); border: 1px solid var(--d-line); margin-top: 1.2rem; }
.rfig { background: var(--charcoal); padding: .9rem 1rem 1.1rem; }
.lab-alt .rfig { background: var(--graphite); }
.rfig .mono { color: var(--d-dim); display: block; font-size: .5625rem; }
.rfig b { display: block; font-family: var(--font-display); font-weight: 700; font-size: clamp(1.5rem, 3vw, 2.2rem); line-height: 1; margin-top: .35rem; color: var(--bone); font-variant-numeric: tabular-nums; }
.rfig .unit { font-family: var(--font-mono); font-size: .5625rem; letter-spacing: .1em; color: var(--d-dim); }
.rfig.hit b { color: var(--lime); }
@media (max-width: 980px) { .ratio-grid { grid-template-columns: 1fr; } }
@media (max-width: 560px) { .ratio-figs { grid-template-columns: 1fr; } }

/* ═════════ 03 · THE RULER ═════════ */
#ruler-svg { display: block; width: 100%; height: auto; }
.rl-band rect { opacity: .16; }
.rl-band text { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em; fill: var(--d-dim); }
.rl-axis { stroke: rgba(246,244,241,.4); stroke-width: 1; }
.rl-tick { stroke: rgba(246,244,241,.3); stroke-width: 1; }
.rl-tick-label { font-family: var(--font-mono); font-size: 10px; letter-spacing: .08em; fill: var(--d-dim); }
.rl-note { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em; fill: var(--d-dim); }
.rl-note-hi { fill: var(--bone); }
.rl-marker { stroke: var(--bone); stroke-width: 1.2; stroke-dasharray: 3 4; }
.rl-marker-label { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em; fill: var(--bone); }
.rl-beat { stroke: var(--lime); stroke-width: 3; }
.rl-beat-dot { fill: var(--lime); stroke: var(--charcoal); stroke-width: 1.5; }
.rl-beat-label { font-family: var(--font-display); font-weight: 600; font-size: 19px; fill: var(--lime); letter-spacing: .02em; }
.rl-pref rect { fill: var(--lime); fill-opacity: .34; stroke: var(--lime); stroke-opacity: .9; stroke-width: 1; }
.rl-pref text { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em; fill: var(--lime); }
.rl-assr { stroke: var(--orange); stroke-width: 2; }
.rl-assr-label { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em; fill: var(--orange); }
.ruler-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.8rem; margin-top: 1.6rem; }
.ruler-controls label { font-family: var(--font-mono); font-weight: 500; font-size: .6875rem; letter-spacing: .12em; text-transform: uppercase; color: var(--d-dim); }
#bpm-range { flex: 1 1 260px; min-width: 200px; accent-color: var(--lime); height: 26px; }
.ruler-readout { font-family: var(--font-mono); font-size: .75rem; letter-spacing: .08em; color: var(--d-dim); font-variant-numeric: tabular-nums; }
.ruler-readout b { color: var(--lime); font-weight: 500; }
.ruler-presets { display: flex; gap: .5rem; flex-wrap: wrap; }

/* ═════════ 04 · HOW IT WORKS — the chain ═════════ */
.chain { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: clamp(1.6rem, 4vh, 2.4rem); }
.link { background: var(--bone); padding: clamp(1.2rem, 2.4vw, 1.8rem); display: flex; flex-direction: column; }
.link-no { font-family: var(--font-mono); font-size: .625rem; letter-spacing: .12em; color: var(--orange); }
.link h3 { font-size: 1.45rem; margin: .7rem 0 .6rem; letter-spacing: .02em; }
.link p { color: var(--ink-2); font-size: .9375rem; }
.link .src { margin-top: auto; padding-top: 1rem; font-family: var(--font-mono); font-size: .625rem; letter-spacing: .01em; line-height: 1.65; color: var(--ink-3); }
@media (max-width: 900px) { .chain { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .chain { grid-template-columns: 1fr; } }

/* ═════════ 05 · WHAT THE RESEARCH SHOWS ═════════ */
.es-chart { border: 1px solid var(--line); padding: clamp(1.1rem, 2.6vw, 1.8rem); margin-top: clamp(1.4rem, 3vh, 2rem); }
#es-svg { display: block; width: 100%; height: auto; }
.es-row-label { font-family: var(--font-mono); font-size: 11px; letter-spacing: .06em; fill: var(--ink); }
.es-val { font-family: var(--font-mono); font-weight: 500; font-size: 11.5px; letter-spacing: .04em; fill: var(--ink); font-variant-numeric: tabular-nums; }
.es-bar { fill: var(--graphite); }
.es-bar.ns { fill: var(--ash); }
.es-ci, .es-ci-cap { stroke: var(--ink-3); stroke-width: 1.4; }
.es-axis { stroke: var(--graphite); stroke-width: 1; }
.es-grid { stroke: var(--ash); stroke-width: 1; }
.es-axis-label { font-family: var(--font-mono); font-size: 10px; letter-spacing: .08em; fill: var(--ink-3); }
.es-benchmark { stroke: var(--orange); stroke-width: 1.2; stroke-dasharray: 3 4; }
.es-benchmark-label { font-family: var(--font-mono); font-size: 10px; letter-spacing: .08em; fill: var(--orange); }
.es-legend { display: flex; flex-wrap: wrap; gap: .8rem 1.8rem; margin-top: 1rem; color: var(--ink-3); }

/* ═════════ 06 · HOW WE BUILD A TRACK ═════════ */
.build-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: clamp(1.6rem, 4vh, 2.4rem); }
.step { background: var(--bone); padding: clamp(1.3rem, 2.6vw, 2rem); }
.step .mono { color: var(--ink-3); display: block; }
.step h3 { font-size: 1.5rem; margin: .6rem 0 .6rem; letter-spacing: .02em; }
.step p { color: var(--ink-2); font-size: .9375rem; }
@media (max-width: 900px) { .build-steps { grid-template-columns: 1fr; } }

/* ═════════ 07 · THE FINE PRINT (condensed appendix) ═════════ */
.fine { border-top: 3px solid var(--graphite); }
.fine .sec-display { font-size: clamp(1.7rem, 3.4vw, 2.4rem); }
.fine-intro { color: var(--ink-2); max-width: 68ch; font-size: .95rem; margin-bottom: 1.6rem; }
.fine-set { border-top: 1px solid var(--line); }
.fine-item { border-bottom: 1px solid var(--line); }
.fine-item > summary {
  cursor: pointer; list-style: none; padding: .95rem 0;
  display: grid; grid-template-columns: 6.5rem 1fr auto; gap: 1rem; align-items: baseline;
}
.fine-item > summary::-webkit-details-marker { display: none; }
.fine-item > summary:hover .f-title { color: var(--orange); }
.f-tag { font-family: var(--font-mono); font-weight: 500; font-size: .5625rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); border-top: 2px solid var(--ash); padding-top: .35rem; }
.f-limit .f-tag { border-top-color: var(--orange); color: var(--orange); }
.f-fail .f-tag { border-top-color: var(--graphite); color: var(--ink); }
.f-brand .f-tag { border-top-color: var(--lime); color: #7E9A00; }
.f-title { font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; letter-spacing: .02em; text-transform: uppercase; color: var(--ink); transition: color .15s ease; }
.f-more { font-family: var(--font-mono); font-size: .625rem; letter-spacing: .1em; color: var(--ink-3); }
.fine-item[open] .f-more { color: var(--orange); }
.f-more::after { content: " +"; }
.fine-item[open] .f-more::after { content: " –"; }
.fine-body { padding: 0 0 1.2rem; max-width: 82ch; }
.fine-body p { color: var(--ink-2); font-size: .9rem; }
.fine-body p + p { margin-top: .55rem; }
.fine-body .src { margin-top: .7rem; font-family: var(--font-mono); font-size: .625rem; letter-spacing: .01em; line-height: 1.65; color: var(--ink-3); }
@media (max-width: 640px) {
  .fine-item > summary { grid-template-columns: 1fr auto; }
  .f-tag { grid-column: 1 / -1; justify-self: start; padding-right: 2rem; }
}
.fine-rule { margin-top: clamp(1.8rem, 4vh, 2.6rem); border-left: 3px solid var(--lime); padding: .2rem 0 .2rem 1.2rem; }
.fine-rule p { color: var(--ink-2); font-size: .95rem; max-width: 72ch; }
.fine-rule strong { color: var(--ink); font-weight: 620; }

/* ═════════ closing ═════════ */
.labs-close { border-top: 1px solid var(--line); }
.close-grid { display: grid; grid-template-columns: 7fr 5fr; gap: clamp(1.6rem, 4vw, 3rem); align-items: start; }
.close-grid p { color: var(--ink-2); max-width: 60ch; }
.close-actions { display: grid; gap: .8rem; align-content: start; }
@media (max-width: 900px) { .close-grid { grid-template-columns: 1fr; } }

/* ═════════ reduced motion ═════════ */
@media (prefers-reduced-motion: reduce) {
  .labs-jump a, .tempo-opt, .btn-ghost, .btn-lab, .tap-pad, .tap-pad .halo, .f-title { transition: none; }
  .btn-lab:hover { transform: none; }
}