:root{
  --bg:#081018;--panel:#111a25;--line:rgba(255,255,255,.13);--text:#f7f9fc;--muted:#9da9b8;
  --green:#22d486;--blue:#2388ff;--yellow:#ffd04a;--purple:#7f3df2;--cream:#fff5cc;--cream2:#fff8df;
}
*{box-sizing:border-box}html,body{margin:0;background:#050a10;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif}
body{background:radial-gradient(circle at 80% 0%,rgba(34,212,134,.12),transparent 30%),linear-gradient(180deg,#081018,#060a10)}
.app{max-width:850px;margin:auto;min-height:100vh;padding:7px}.topbar{height:34px;display:flex;align-items:center;gap:12px}.menu{font-size:22px;color:#dbe4ee;line-height:1}.brand{flex:1;text-align:center;font-size:20px;font-weight:950}.brand span{color:var(--green)}.spacer{width:26px}
.card{border:1px solid var(--line);border-radius:18px;background:rgba(15,23,34,.92);padding:7px;box-shadow:0 24px 80px rgba(0,0,0,.38)}
.diagramPanel{background:radial-gradient(circle at 70% 16%,rgba(255,255,255,.45),transparent 38%),linear-gradient(180deg,var(--cream2),var(--cream));color:#05080c;border-radius:18px;padding:10px 12px 9px}.label{text-align:center;letter-spacing:5px;font-size:10px;font-weight:950;color:#425064;margin-bottom:3px}.chordTitle{text-align:center;font-size:48px;font-weight:950;line-height:.9;margin-bottom:2px;letter-spacing:-1px}
#chordSvg{display:block;width:100%;height:auto;max-height:46vh;margin:0 auto}.legendInfo{display:grid;grid-template-columns:minmax(110px,1fr) minmax(120px,1fr) minmax(110px,1fr);gap:8px;max-width:700px;margin:2px auto 8px}.legendInfo div{border:1px solid rgba(20,30,40,.22);border-radius:9px;padding:8px 10px;text-align:center;font-size:14px;color:#203040;background:rgba(255,255,255,.25);white-space:nowrap;overflow:visible}.legendInfo b{letter-spacing:1px}#shapeLabel{color:var(--purple)}
.navRow{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;max-width:640px;margin:0 auto 8px}.navBtn{height:38px;border:0;border-radius:10px;background:linear-gradient(180deg,#182232,#0b121d);color:#fff;font-weight:950;font-size:14px}.playBtn{background:linear-gradient(180deg,#ffd85f,#ffc12e);color:#171000}.toggle{display:flex;background:#081018;border:1px solid rgba(255,255,255,.18);border-radius:12px;padding:4px;max-width:560px;margin:0 auto}.displayBtn{flex:1;height:31px;border:0;border-radius:9px;background:transparent;color:#c7d1de;font-weight:950;font-size:14px}.displayBtn.active{background:var(--yellow);color:#111}
.controls{padding:5px 0 0}.group{border-bottom:1px solid var(--line);padding:5px 0}.groupTitle{font-size:14px;font-weight:950;margin-bottom:5px}.groupHead{display:flex;justify-content:space-between;align-items:center;gap:8px}.modeToggle{display:flex;background:#081018;border:1px solid var(--line);padding:3px;border-radius:11px}.modeBtn{border:0;border-radius:8px;background:transparent;color:#aeb8c5;font-weight:950;height:28px;padding:0 13px}.modeBtn.active{background:var(--green);color:#04130d}.buttonRow{display:grid;gap:5px}.rootRow{grid-template-columns:repeat(12,1fr)}.typeRow{grid-template-columns:repeat(10,1fr)}.shapeRow{grid-template-columns:repeat(7,1fr)}.pickBtn{height:32px;border:1px solid rgba(255,255,255,.14);border-radius:9px;background:linear-gradient(180deg,#202a36,#111821);color:#fff;font-size:13px;font-weight:950;padding:0 4px}.pickBtn.rootActive{background:linear-gradient(135deg,#22d486,#12b872);color:#04130d;border-color:#22d486}.pickBtn.typeActive{background:linear-gradient(135deg,#2388ff,#1769dd);border-color:#2388ff}.pickBtn.shapeActive{background:linear-gradient(135deg,#874df6,#672bd2);border-color:#874df6}footer{text-align:center;color:#647080;font-size:12px;font-weight:750;margin-top:9px}
@media(max-width:520px){
  .app{padding:5px}
  .topbar{height:32px}
  .brand{font-size:17px}
  .menu{font-size:21px}
  .card{padding:5px;border-radius:15px}
  .diagramPanel{border-radius:15px;padding:8px 8px 7px}
  .label{font-size:8px;letter-spacing:4px;margin-bottom:1px}
  .chordTitle{font-size:42px;margin-bottom:0}
  #chordSvg{max-height:42vh}
  .legendInfo{gap:5px;margin:1px auto 6px}
  .legendInfo div{font-size:12px;padding:6px 4px}
  .navRow{gap:6px;margin-bottom:6px}
  .navBtn{height:34px;font-size:12px}
  .displayBtn{height:28px;font-size:13px}
  .group{padding:5px 0}
  .groupTitle{font-size:14px;margin-bottom:4px}
  .rootRow{grid-template-columns:repeat(6,1fr)}
  .typeRow{grid-template-columns:repeat(5,1fr)}
  .shapeRow{grid-template-columns:repeat(4,1fr)}
  .pickBtn{height:28px;font-size:11px}
  footer{font-size:10px;margin-top:5px}
}
@media(max-height:760px){
  #chordSvg{max-height:38vh}
  .chordTitle{font-size:38px}
  .legendInfo div{padding:5px 3px}
  .navBtn{height:32px}
  .displayBtn{height:27px}
  .pickBtn{height:27px}
}