:root{
  --paper:#f6f5f1; --surface:#ffffff; --ink:#1b1b19; --muted:#6f6f68;
  --line:#d9d8d1; --line-strong:#b9b8b0; --grid:#e7e6df; --radius:10px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);
  -webkit-font-smoothing:antialiased;line-height:1.4;
  padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom)}
.wrap{max-width:1080px;margin:0 auto;padding:18px 16px 64px}

header{margin-bottom:18px}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted);margin:0 0 4px}
h1{font-size:24px;line-height:1.05;letter-spacing:-.01em;margin:0 0 2px;font-weight:650}
.credit{font-size:13px;color:var(--ink);margin:0 0 8px;font-weight:550}
.sub{font-size:13.5px;color:var(--muted);margin:0;max-width:60ch}

.pagefoot{margin-top:40px;padding-top:18px;border-top:1px solid var(--line);
  font-size:11.5px;color:var(--muted);line-height:1.7}
.pagefoot .course{font-family:var(--mono);letter-spacing:.04em;color:var(--ink);
  text-transform:uppercase;font-size:11px;margin-bottom:6px}
.pagefoot .role b{color:var(--ink);font-weight:600}
.pagefoot p{margin:0}
.pagefoot .course{margin:14px 0 2px}
.pagefoot .back{margin-top:16px}
.pagefoot a{color:var(--ink);text-decoration:underline;text-underline-offset:3px}
.pagefoot .org{margin-top:8px;max-width:78ch}
.pagefoot .org b{color:var(--ink);font-weight:600}

/* desplegables del pie: si el navegador es muy viejo y no entiende <details>,
   el contenido se ve siempre abierto (no se pierde información) */
.fold{margin-top:14px;border-top:1px solid var(--line);padding-top:10px}
.fold summary{cursor:pointer;font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink);list-style:none;padding:2px 0}
.fold summary::-webkit-details-marker{display:none}
.fold summary::before{content:"+";display:inline-block;width:1.1em;color:var(--muted);font-weight:600}
.fold[open] summary::before{content:"–"}
.fold-body{padding:8px 0 2px 1.1em;max-width:78ch}
.fold-body p{margin:0 0 6px}
.fold-body .aster{color:var(--muted);font-size:11px}
.fold-body .ref{margin-bottom:10px}

/* enlaces como ícono (sin mostrar la dirección larga) */
a.lnk{display:inline-block;vertical-align:-3px;margin-left:4px;text-decoration:none;
  border-bottom:0;line-height:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
a.lnk svg{width:15px;height:15px;fill:none;stroke:var(--ink);stroke-width:1.5;
  stroke-linecap:round;stroke-linejoin:round}
a.lnk:hover svg{stroke:#0a58c2}

.toggle{display:inline-flex;border:1px solid var(--line-strong);border-radius:999px;
  padding:3px;background:var(--surface);margin-top:14px;gap:2px}
.toggle button{border:0;background:transparent;cursor:pointer;font-family:var(--mono);
  font-size:12px;letter-spacing:.04em;padding:8px 16px;border-radius:999px;
  color:var(--muted);transition:.18s;white-space:nowrap}
.toggle button .small{display:block;font-size:9.5px;letter-spacing:.12em;opacity:.7;margin-top:1px}
.toggle button[aria-pressed="true"]{background:var(--ink);color:#fff}

.layout{display:grid;grid-template-columns:1fr;gap:20px;margin-top:22px}
@media(min-width:860px){.layout{grid-template-columns:minmax(0,1fr) minmax(330px,400px);align-items:start}}
.col{min-width:0}
.block{margin-bottom:26px}
.label{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);margin:0 0 10px;display:flex;align-items:center;gap:8px}
.label::after{content:"";flex:1;height:1px;background:var(--line)}

.wheel-block{max-width:300px}
.wheel-wrap{display:flex;justify-content:center}
.wheel{width:min(72vw,260px);height:auto;cursor:pointer;touch-action:manipulation}
.wheel path{transition:filter .15s ease}
.wheel path:hover{filter:brightness(1.06)}
.wheel path.sel{stroke:var(--ink);stroke-width:3.4}

.sheet-outer{display:flex;justify-content:center}
.sheet{position:relative;width:100%;max-width:460px;aspect-ratio:1/1}
.cell{position:absolute;width:16%;aspect-ratio:1/1;border-radius:5px;
  border:1px solid var(--line-strong);overflow:hidden;cursor:pointer;display:flex;
  background:#fff;touch-action:manipulation;transition:transform .12s, box-shadow .12s}
.cell:hover{transform:scale(1.05);z-index:5}
.cell.sel{box-shadow:0 0 0 3px var(--ink);z-index:6}
.cell .swatch{flex:1.25;height:100%}
.cell .prims{display:flex;width:38%;height:100%;border-left:1px solid var(--line-strong)}
.cell .pcol{flex:1;position:relative;border-right:1px solid var(--grid);
  background:repeating-linear-gradient(to top,transparent,transparent calc(12.5% - .7px),
    var(--grid) calc(12.5% - .7px),var(--grid) 12.5%)}
.cell .pcol:last-child{border-right:0}
.cell .pcol i{position:absolute;left:0;right:0;bottom:0;display:block}
.cell .kcrw{width:25%;height:100%;display:flex;flex-direction:column;border-left:1px solid var(--line-strong)}
.cell .kcrw span{display:block;width:100%}

.detail{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 16px 18px}
.detail h3{margin:0 0 14px;font-size:13px;font-family:var(--mono);letter-spacing:.06em;
  display:flex;justify-content:space-between;align-items:baseline;color:var(--ink)}
.detail h3 em{font-style:normal;color:var(--muted);font-size:11px;letter-spacing:.1em}
.chart{display:flex;gap:10px;align-items:stretch}
.scale{font-family:var(--mono);font-size:9.5px;color:var(--muted)}
.scale .ticks{position:relative;height:176px;width:6.6em}
.scale .tick{position:absolute;right:0;display:flex;gap:.6em;line-height:1;white-space:nowrap;
  -webkit-transform:translateY(50%);transform:translateY(50%)}
.scale .p{width:3.3em;text-align:right}
.scale .v{width:2.7em;text-align:right;color:var(--ink)}
.bars{display:flex;gap:5px}
.barcol{display:flex;flex-direction:column;align-items:center;gap:4px}
.barcol .head{font-family:var(--mono);font-size:10px;color:var(--muted);letter-spacing:.04em}
.stack{width:20px;height:176px;display:flex;flex-direction:column-reverse;
  border:1px solid var(--line-strong);background:#fff}
.stack .u{flex:1;border-top:1px solid var(--grid)}
/* column-reverse: el último hijo es el de arriba (toca el borde); el primero es el 0–12,5% */
.stack .u:last-child{border-top:0}
.grouphead{font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;color:var(--muted);
  text-transform:uppercase;text-align:center;margin-bottom:6px}
.sample{flex:1;min-width:84px;display:flex;flex-direction:column;border:1px solid var(--line-strong)}
.sample .fill{flex:1;min-height:96px}
.sample .read{padding:9px 10px;font-family:var(--mono);font-size:11px;background:#fff;border-top:1px solid var(--line-strong)}
.sample .read .row{display:flex;justify-content:space-between;gap:6px}
.sample .read .row span:last-child{color:var(--muted)}
.sample .read hr{border:0;border-top:1px dashed var(--line);margin:7px 0}
.croma{margin-top:16px;border-top:1px solid var(--line);padding-top:12px}
.croma-title{margin:0 0 8px;font-family:var(--mono);font-size:11px;font-weight:600;color:var(--ink)}
.croma-title span{font-family:var(--sans);font-weight:400;font-size:11px;color:var(--muted)}
.croma-body{display:flex;gap:12px;align-items:stretch}
.croma-swatch{width:64px;min-height:54px;border:1px solid var(--line-strong);flex:none}
.croma-rows{flex:1;min-width:0;display:flex;flex-direction:column;justify-content:space-between;gap:4px}
.crow{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:9.5px;color:var(--muted)}
.crow .lab{width:1em;text-align:right}
.crow .hbar{flex:1;max-width:136px;height:12px;display:flex;border:1px solid var(--line-strong);background:#fff}
.crow .hbar i{flex:1;border-left:1px solid var(--grid)}
.crow .hbar i:first-child{border-left:0}
.crow .p{width:3.3em;text-align:right}
.crow .v{width:2.7em;text-align:right;color:var(--ink)}
.note{font-size:11.5px;color:var(--muted);margin-top:18px;line-height:1.5}
.note code{font-family:var(--mono);background:#ecebe4;padding:1px 4px;border-radius:3px;font-size:10.5px}

/* ---------- armonías de Ostwald ---------- */
.harm{margin-top:34px}
.harm-btns{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.harm-btns button{display:flex;align-items:baseline;gap:6px;border:1px solid var(--line-strong);
  background:var(--surface);color:var(--ink);font-family:var(--sans);font-size:12px;
  padding:7px 11px;border-radius:999px;cursor:pointer;transition:.15s;text-align:left}
.harm-btns button b{font-family:var(--mono);font-size:10px;color:var(--muted);font-weight:600}
.harm-btns button:hover:not([disabled]){border-color:var(--ink)}
.harm-btns button[aria-pressed="true"]{background:var(--ink);color:#fff;border-color:var(--ink)}
.harm-btns button[aria-pressed="true"] b{color:#fff;opacity:.6}
.harm-hint,.harm-sub{font-size:12px;color:var(--muted);margin:0 0 12px;max-width:64ch}
.harm-opt{display:flex;align-items:center;gap:12px;width:100%;max-width:520px;background:none;
  border:0;padding:4px;margin-bottom:6px;cursor:pointer;font-family:var(--sans);text-align:left}
.harm-opt .strip{display:flex;height:34px;width:250px;border:1px solid var(--line-strong);flex:none}
.harm-opt .strip span{flex:1;position:relative}
/* punto que marca, dentro de la tira, el color tocado en la hoja */
.harm-opt .strip span.cur::after{content:"";position:absolute;left:50%;top:50%;width:8px;height:8px;
  margin:-4px 0 0 -4px;border-radius:50%;background:#fff;box-shadow:0 0 0 1.5px var(--ink)}
.harm-group{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--muted);margin:14px 0 6px}
.harm-opt .opt-label{font-size:12.5px;color:var(--ink)}
.harm-opt.sel .strip{outline:2px solid var(--ink);outline-offset:1px}
.harm-opt.sel .opt-label{font-weight:600}

.harm-shot{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);
  padding:14px;margin-top:16px;overflow-x:auto}
.harm-title{margin:0 0 12px;font-size:12.5px;color:var(--ink)}
.harm-maps{display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap;margin-bottom:16px}
.hwheel{flex:none;display:block}
.hpanel{flex:none}
.hpanel-t{margin:0 0 4px;font-size:11px;color:var(--muted)}
.hpanel-s{position:relative}
.hc{position:absolute;border:1px solid var(--line-strong);border-radius:3px}
.hc.on{border:2.5px solid var(--ink);border-radius:4px}
.hc.cur::after{content:"";position:absolute;left:50%;top:50%;width:7px;height:7px;margin:-3.5px 0 0 -3.5px;
  border-radius:50%;background:#fff;box-shadow:0 0 0 1.5px var(--ink)}
.hcards{display:flex;gap:10px;flex-wrap:wrap}
.hcard-t{margin:0 0 6px;font-size:11px;color:var(--ink)}
.hcard-t b{font-weight:600;color:var(--muted)}
.hcard.is-cur{border-color:var(--ink)}
.harm-warn{font-size:12px;color:var(--ink);background:#ecebe4;border-radius:6px;padding:8px 10px;
  margin:0 0 12px;max-width:64ch}
.hcard{width:164px;border:1px solid var(--line);padding:8px;background:#fff}
.hcard-top{display:flex;gap:8px;align-items:flex-start}
.hcard .stack.mini{width:16px;height:80px}
.hcard .bars{gap:4px}
.hcard-fill{flex:1;min-width:48px;height:80px;border:1px solid var(--line-strong)}
.hcard .read{margin-top:8px;font-family:var(--mono);font-size:10px}
.hcard .read .row{display:flex;justify-content:space-between;gap:6px}
.hcard .read .row span:last-child{color:var(--muted)}
.hcard .read hr{border:0;border-top:1px dashed var(--line);margin:6px 0}
.harm-actions{margin-top:12px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.harm-actions button{border:1px solid var(--line-strong);background:var(--surface);color:var(--ink);
  font-family:var(--sans);font-size:12.5px;padding:9px 16px;border-radius:6px;cursor:pointer}
.harm-actions button:hover{border-color:var(--ink)}
.harm-msg{font-size:11.5px;color:var(--muted)}
@media(max-width:600px){
  .harm-opt .strip{width:150px;height:28px}
  .hpanel-s{max-width:100%}
}