:root{
  --bg:#eceef2;
  --panel:rgba(255,255,255,.66);
  --line:#d3d8e0;
  --text:#16202c;
  --text-2:#4d5766;
  --text-3:#828d9d;
  --accent:#b8372a;
  --ink:#16202c;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --serif:'Instrument Serif',Georgia,'Times New Roman',serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{
  background:var(--bg); color:var(--text); font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  background-image:radial-gradient(120% 95% at 50% 0%, #f7f8fa 0%, #eceef2 58%, #dfe3ea 100%);
}
:focus-visible{outline:2px solid var(--accent); outline-offset:2px; border-radius:6px}
button,input{font-family:inherit; color:inherit}

.page{min-height:100%; display:flex; flex-direction:column}

/* ---------- top bar ---------- */
.bar{
  display:flex; justify-content:space-between; align-items:center; gap:12px;
  padding:max(14px, env(safe-area-inset-top)) 20px 0; flex:none;
}
.home,.icon{
  display:inline-flex; align-items:center; gap:7px; height:38px;
  color:var(--text); text-decoration:none; font:500 14px/1 var(--sans);
  background:var(--panel); border:1px solid var(--line); border-radius:999px;
  cursor:pointer; transition:background .15s, border-color .15s;
}
.home{padding:0 14px 0 10px}
.home span{font-family:var(--serif); font-size:18px; letter-spacing:.01em}
.icon{width:38px; justify-content:center; padding:0}
.home:hover,.icon:hover{background:#fff; border-color:#b9c1cc}

/* ---------- layout ---------- */
main{
  flex:1; min-height:0; display:grid; grid-template-columns:minmax(0,1fr) 330px;
  gap:24px; padding:10px 20px max(18px, env(safe-area-inset-bottom));
}
.stage{display:flex; flex-direction:column; min-height:0; min-width:0}
.titleblock{flex:none; padding:6px 4px 10px; max-width:620px}
.kicker{font-size:11.5px; font-weight:600; letter-spacing:.15em; text-transform:uppercase; color:var(--text-3)}
h1{
  font-family:var(--serif); font-weight:400; font-size:clamp(33px, 4.4vw, 60px);
  line-height:.98; letter-spacing:-.01em; margin:4px 0 8px;
}
.sub{font-size:14.5px; line-height:1.55; color:var(--text-2); max-width:56ch}
.sub em{color:var(--text); font-style:italic; font-family:var(--serif); font-size:17px}
.boardwrap{flex:1; min-height:0; position:relative}
#stage{
  position:absolute; inset:0; width:100%; height:100%; display:block;
  touch-action:none; border-radius:14px;
}
#stage.drawing{cursor:crosshair}
.flash{
  position:absolute; left:50%; bottom:8px; transform:translateX(-50%);
  margin:0; padding:7px 16px; border-radius:999px; pointer-events:none;
  background:rgba(22,32,44,.9); color:#f3f5f8; font:500 13px var(--sans);
  white-space:nowrap; max-width:calc(100% - 20px); overflow:hidden; text-overflow:ellipsis;
  opacity:0; transition:opacity .25s, transform .25s;
}
.flash.on{opacity:1; transform:translateX(-50%) translateY(-2px)}
.readout{
  flex:none; text-align:center; padding:9px 4px 0; min-height:22px;
  font-size:13px; color:var(--text-2); font-variant-numeric:tabular-nums;
}
.readout b{color:var(--text); font-weight:600}
.readout .hl{color:var(--accent); font-weight:600}

/* ---------- deck ---------- */
.deck{
  display:flex; flex-direction:column; gap:14px; overflow:auto; min-height:0;
  padding:16px; border-radius:18px;
  background:var(--panel); border:1px solid var(--line);
}
.lbl{font-size:11.5px; font-weight:600; letter-spacing:.1em; text-transform:uppercase; color:var(--text-3)}
.deck-head{display:flex; align-items:flex-start; justify-content:space-between; gap:10px}
.figname{font-family:var(--serif); font-size:26px; line-height:1.1; margin-top:2px}
.sq{
  width:34px; height:34px; flex:none; display:grid; place-items:center; cursor:pointer;
  border:1px solid var(--line); border-radius:10px; background:rgba(255,255,255,.7); color:var(--text-2);
}
.sq:hover{background:#fff; color:var(--text); border-color:#b9c1cc}

.note{font-size:12.5px; line-height:1.6; color:var(--text-3); min-height:40px}
.note i{font-style:italic; color:var(--text-2)}

/* ---------- circles knob ---------- */
.knob{
  padding:12px 14px 11px; border-radius:14px;
  background:rgba(255,255,255,.7); border:1px solid var(--line);
}
.knob-head{display:flex; align-items:baseline; justify-content:space-between}
.big{
  font-family:var(--serif); font-size:34px; line-height:1; color:var(--text);
  font-variant-numeric:tabular-nums;
}
input[type=range]{
  -webkit-appearance:none; appearance:none; width:100%; height:22px; margin:6px 0 2px;
  background:transparent; cursor:pointer; display:block;
}
input[type=range]::-webkit-slider-runnable-track{height:4px; border-radius:3px; background:#cdd4de}
input[type=range]::-moz-range-track{height:4px; border-radius:3px; background:#cdd4de}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none; width:18px; height:18px; margin-top:-7px; border-radius:50%;
  background:var(--accent); border:2px solid #fff; box-shadow:0 1px 4px rgba(22,32,44,.35);
}
input[type=range]::-moz-range-thumb{
  width:18px; height:18px; border-radius:50%; border:2px solid #fff;
  background:var(--accent); box-shadow:0 1px 4px rgba(22,32,44,.35);
}
.scale{display:flex; justify-content:space-between; gap:8px; font-size:11px; color:var(--text-3)}
.scale span:nth-child(2){font-style:italic}

/* ---------- spectrum ---------- */
.specwrap{display:flex; flex-direction:column; gap:7px}
#spectrum{width:100%; height:74px; display:block; border-radius:10px; background:rgba(255,255,255,.55);
  border:1px solid var(--line)}
.caption{font-size:11.5px; line-height:1.55; color:var(--text-3)}

.deck-row{display:flex; gap:8px}
.ghost{
  flex:1; display:inline-flex; align-items:center; justify-content:center; gap:6px; height:36px;
  border:1px solid var(--line); border-radius:10px; background:rgba(255,255,255,.65);
  color:var(--text-2); font:500 13px var(--sans); cursor:pointer;
  transition:background .15s, color .15s, border-color .15s;
}
.ghost:hover{background:#fff; color:var(--text); border-color:#b9c1cc}
.ghost.on{background:var(--accent); border-color:var(--accent); color:#fdf4f2}
.ghost.on:hover{background:#a23025; color:#fff}

.levels{display:flex; flex-direction:column; gap:8px}
.chips{display:flex; flex-wrap:wrap; gap:6px}
.chips button{
  height:32px; padding:0 11px; border-radius:9px; cursor:pointer;
  border:1px solid var(--line); background:rgba(255,255,255,.65);
  color:var(--text-2); font:500 13px var(--sans);
}
.chips button:hover{background:#fff; color:var(--text)}
.chips button.is-on{background:var(--ink); border-color:var(--ink); color:#f2f4f8}
.quote{
  margin-top:2px; padding:2px 0 2px 13px; border-left:2px solid #d8bcb7;
  font-family:var(--serif); font-size:16.5px; line-height:1.35; color:var(--text-2);
}
.quote cite{display:block; margin-top:6px; font:400 11.5px/1.5 var(--sans); font-style:normal; color:var(--text-3)}
.keys{margin-top:auto; padding-top:12px; border-top:1px solid var(--line);
  font-size:11.5px; line-height:1.8; color:var(--text-3)}
kbd{font:500 11px var(--sans); padding:1px 5px; border-radius:4px; border:1px solid #bcc4d0; color:var(--text-2)}

/* ---------- about ---------- */
dialog{
  margin:auto; width:min(600px, calc(100% - 32px)); max-height:calc(100% - 40px);
  border:0; border-radius:20px; padding:0; color:#16202c; background:#fbfcfd;
  box-shadow:0 30px 80px -24px rgba(22,32,44,.5);
}
dialog::backdrop{background:rgba(22,32,44,.42); -webkit-backdrop-filter:blur(3px); backdrop-filter:blur(3px)}
.about{position:relative; padding:30px 32px 28px}
.about .x{position:absolute; top:14px; right:14px; width:30px; height:30px; display:grid; place-items:center;
  border:0; border-radius:8px; background:transparent; color:#6c7683; cursor:pointer}
.about .x:hover{background:#eceef2; color:#16202c}
.about .kicker{color:var(--accent)}
.about h2{font-family:var(--serif); font-weight:400; font-size:38px; line-height:1.05; margin:6px 0 14px}
.about p{font-size:15px; line-height:1.65; color:#3c4653; margin-bottom:12px}
.about b{font-weight:600; color:#16202c}
.about i{font-style:italic}
.about .fine{font-size:13.5px; color:#6c7683; margin:16px 0 0; padding-top:14px; border-top:1px solid #e4e8ee}

/* ---------- phone ---------- */
@media (max-width:880px){
  main{grid-template-columns:1fr; gap:14px; padding:8px 14px max(18px, env(safe-area-inset-bottom))}
  .titleblock{padding:4px 2px 8px}
  .sub{font-size:13.5px}
  .sub em{font-size:15.5px}
  .boardwrap{aspect-ratio:1/.95; height:auto}
  .deck{padding:14px; gap:13px}
  .figname{font-size:23px}
  .keys{margin-top:4px}
  .about{padding:26px 22px 22px}
  .about h2{font-size:31px}
}
@media (min-width:881px){
  html,body{overflow:hidden}
  .page{height:100%}
}
@media (prefers-reduced-motion:reduce){
  *{transition-duration:.01ms !important}
}