:root {
  --bg: #0f1116;
  --bg2: #161922;
  --card: #1a1e29;
  --line: #2a3040;
  --text: #eef1f7;
  --muted: #8d95a8;
  --accent: #ff7a45;
  --accent2: #ffb347;
  --fT: #2fcf8f;
  --fS: #4aa8f0;
  --fD: #ff7a45;
  --ringA: #1f2433;
  --ringB: #1a1f2c;
  --ringC: #171b26;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 18px;
}
[data-theme="light"] {
  --bg: #f3f4f8;
  --bg2: #e9ebf2;
  --card: #ffffff;
  --line: #dde1ea;
  --text: #171a22;
  --muted: #646c80;
  --fT: #17a96f;
  --fS: #2687d6;
  --fD: #f0652b;
  --ringA: #eef0f6;
  --ringB: #e5e8f0;
  --ringC: #dce0ea;
  --shadow: 0 8px 24px rgba(30,40,70,.10);
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: radial-gradient(1200px 600px at 50% -200px, rgba(255,122,69,.13), transparent 70%), var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-tap-highlight-color: transparent;
}
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.tight { margin: -2px 0 8px; }

/* ---------- header ---------- */
.top {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 12px;
  max-width: 1180px; margin: 0 auto; padding: 14px 18px;
  padding-top: max(14px, env(safe-area-inset-top));
}
.brand { display: flex; align-items: center; gap: 10px; font-size: 1.25rem; letter-spacing: .2px; }
.brand b { color: var(--accent); }
.top-actions { display: flex; gap: 8px; justify-self: end; }
.maker-logo {
  justify-self: center; display: block; background: #fff; border-radius: 12px; padding: 5px 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,.18); transition: transform .12s, box-shadow .12s; line-height: 0;
}
[data-theme="light"] .maker-logo { box-shadow: 0 0 0 1px var(--line); }
.maker-logo:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(79,195,247,.35); }
.maker-logo img { height: 36px; width: auto; display: block; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--card); display: grid; place-items: center; font-weight: 700;
}
.icon-btn:hover, .chip:hover { border-color: var(--accent); }

main { max-width: 1180px; margin: 0 auto; padding: 0 18px 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel { padding: 16px 18px 18px; }
.panel h2 { margin: 0 0 6px; font-size: 1.05rem; }
.ph { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }
.ph h2 { margin: 0; }
.ph p { margin: 0; }
.lbl { display: flex; justify-content: space-between; margin: 14px 0 6px; font-size: .85rem; color: var(--muted); }
.lbl b { color: var(--text); font-weight: 600; }
.pill { padding: 3px 11px; border-radius: 99px; background: var(--bg2); border: 1px solid var(--line); color: var(--muted); font-size: .82rem; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  border: 1px solid var(--line); background: var(--bg2); border-radius: 10px; padding: 7px 11px;
  font-size: .9rem; line-height: 1.1;
}
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn { border: 0; border-radius: 12px; padding: 9px 16px; background: var(--accent); color: #fff; font-weight: 600; }
.btn.ghost { background: var(--bg2); color: var(--text); border: 1px solid var(--line); }
.btn:active, .chip:active { transform: scale(.97); }
.slider { width: 100%; accent-color: var(--accent); height: 28px; }

.switch { display: flex; align-items: center; gap: 10px; cursor: pointer; user-select: none; font-size: .9rem; }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.switch span { width: 42px; height: 24px; border-radius: 99px; background: var(--line); position: relative; flex: none; transition: background .15s; }
.switch span::after { content: ""; position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 50%; background: #fff; transition: transform .15s; }
.switch input:checked + span { background: var(--accent); }
.switch input:checked + span::after { transform: translateX(18px); }
.switch input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.switch em { font-style: normal; }

/* ---------- hero ---------- */
.hero { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr); gap: 16px; align-items: start; }
.wheel-card { padding: 14px 16px 16px; }
.stage-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: .8rem; color: var(--muted); }
.lg { display: inline-flex; align-items: center; gap: 5px; }
.lg i { width: 11px; height: 11px; border-radius: 3px; display: inline-block; }
.lg em { font-style: normal; }
.fn-T { --fn: var(--fT); }
.fn-S { --fn: var(--fS); }
.fn-D { --fn: var(--fD); }
.lg i { background: var(--fn); }

.wheel-wrap { max-width: 560px; margin: 6px auto 0; }
#wheel { width: 100%; height: auto; display: block; user-select: none; touch-action: manipulation; }
#rotor, .lab { transform-box: view-box; transition: transform .6s cubic-bezier(.2,.8,.2,1); }
#rotor { transform-origin: 300px 300px; }

.seg { cursor: pointer; }
.seg .cell { stroke: var(--card); stroke-width: 2.5; transition: fill .25s, opacity .25s; }
.seg.maj .cell { fill: var(--ringA); }
.seg.min .cell { fill: var(--ringB); }
.seg.dim .cell { fill: var(--ringC); }
.seg.sig { cursor: default; }
.seg.sig .cell { fill: var(--bg2); }
.seg:hover .cell { fill: color-mix(in srgb, var(--accent) 16%, var(--ringA)); }
.seg.sig:hover .cell { fill: var(--bg2); }
.seg text { pointer-events: none; text-anchor: middle; dominant-baseline: central; fill: var(--muted); transition: fill .25s; }
.seg .nm { font-weight: 700; }
.seg.maj .nm { font-size: 25px; }
.seg.min .nm { font-size: 18px; }
.seg.dim .nm { font-size: 13px; }
.seg.sig .nm { font-size: 11px; font-weight: 600; }
.seg .alt { font-size: 11px; opacity: .8; }
.seg .rom { font-size: 12px; font-weight: 700; opacity: 0; transition: opacity .25s; }
.seg.min .rom { font-size: 11px; }
.seg.dim .rom { font-size: 9.5px; }

.seg.dia .cell { fill: color-mix(in srgb, var(--fn) 30%, var(--ringA)); }
.seg.dia text { fill: var(--text); }
.seg.dia .rom { opacity: 1; fill: var(--fn); }
.seg.tonic .cell { fill: var(--fn); }
.seg.tonic text, .seg.tonic .rom { fill: #fff; }
.seg.sigOn .cell { fill: color-mix(in srgb, var(--accent) 22%, var(--bg2)); }
.seg.sigOn text { fill: var(--text); }
.seg.sel .cell { stroke: var(--text); stroke-width: 4; }
.seg.sel.ext .cell { fill: color-mix(in srgb, #b07cff 45%, var(--ringA)); }
.seg.sel.ext text { fill: var(--text); }
.seg.pulse .cell { animation: pulse .5s ease-out; }
@keyframes pulse { from { filter: brightness(1.6); } to { filter: none; } }

.hub { fill: var(--bg2); stroke: var(--line); stroke-width: 2; }
#center text { text-anchor: middle; dominant-baseline: central; pointer-events: none; }
.c-key { font-size: 40px; font-weight: 800; fill: var(--text); }
.c-mode { font-size: 17px; font-weight: 600; fill: var(--accent); }
.c-sig { font-size: 13px; fill: var(--muted); }

.hint { margin: 6px 0 0; font-size: .8rem; color: var(--muted); text-align: center; }
.wopts { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 10px 18px; margin-top: 12px; }

.side { display: grid; gap: 16px; }
.key-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.key-head h1 { margin: 0; font-size: 1.9rem; line-height: 1.1; letter-spacing: -.5px; }
.key-head p { margin: 4px 0 0; }
#enhBtn { white-space: nowrap; font-weight: 600; }
.sigbox { display: flex; align-items: center; gap: 14px; margin: 12px 0; padding: 8px 12px; border-radius: 14px; background: var(--bg2); border: 1px solid var(--line); }
#staff { width: 170px; flex: none; height: auto; }
#staff line { stroke: var(--muted); stroke-width: 1.2; opacity: .7; }
#staff .acc { fill: var(--accent); font-size: 22px; font-weight: 700; text-anchor: middle; dominant-baseline: central; }
#staff .clef { fill: var(--muted); font-size: 11px; font-weight: 700; }
.lbl0 { font-size: .78rem; color: var(--muted); }
#sigText { margin: 2px 0 0; font-weight: 600; line-height: 1.35; }
.btnrow { display: flex; gap: 8px; flex-wrap: wrap; }
.rel { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; }
.rel button {
  text-align: left; border: 1px solid var(--line); background: var(--bg2); border-radius: 12px; padding: 7px 10px;
  display: flex; flex-direction: column; gap: 1px;
}
.rel button small { color: var(--muted); font-size: .72rem; }
.rel button b { font-size: .98rem; }
.rel button:hover { border-color: var(--accent); }

.chord-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; margin: 10px 0 6px; }
.cbtn {
  border: 1px solid color-mix(in srgb, var(--fn) 45%, var(--line)); border-radius: 12px; padding: 7px 2px 6px;
  background: color-mix(in srgb, var(--fn) 12%, var(--bg2)); display: flex; flex-direction: column; align-items: center; gap: 2px;
  min-width: 0; transition: transform .08s, background .15s;
}
.cbtn .rn { color: var(--fn); font-weight: 800; font-size: .78rem; }
.cbtn b { font-size: 1.05rem; white-space: nowrap; }
.chord-grid.sev .cbtn b { font-size: .8rem; letter-spacing: -.3px; }
.chord-grid.sev .cbtn .rn { font-size: .7rem; }
.cbtn .tn { font-size: .66rem; color: var(--muted); text-align: center; line-height: 1.2; }
.cbtn em { font-style: normal; font-size: .6rem; color: var(--muted); }
.cbtn.on, .xchip.on, .pc.on { background: var(--fn); border-color: var(--fn); color: #fff; }
.cbtn.on .rn, .cbtn.on .tn, .cbtn.on em, .xchip.on small, .pc.on small { color: #fff; }
.extra { display: flex; flex-wrap: wrap; gap: 6px; }
.xchip, .pc {
  --fn: #9b6cf0; border: 1px solid var(--line); background: var(--bg2); border-radius: 10px; padding: 5px 9px;
  display: inline-flex; align-items: baseline; gap: 6px; font-weight: 700;
}
.xchip small, .pc small { color: var(--muted); font-weight: 600; font-size: .72rem; }
.xchip:hover { border-color: var(--fn); }

/* ---------- piano ---------- */
.piano-card { margin-top: 16px; }
.piano { position: relative; height: 150px; margin: 8px 0 2px; display: flex; user-select: none; touch-action: manipulation; }
.piano .key { border: 1px solid #c9cfdb; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; padding-bottom: 7px; font-size: .74rem; font-weight: 700; gap: 3px; }
.piano .white { flex: 1; background: #f7f8fb; color: #3c4252; border-radius: 0 0 8px 8px; margin-right: -1px; height: 100%; }
.piano .black { position: absolute; top: 0; height: 60%; background: #1b1f29; color: #cdd3e0; border-color: #000; border-radius: 0 0 6px 6px; z-index: 2; font-size: .62rem; padding-bottom: 5px; }
.piano .key i { width: 10px; height: 10px; border-radius: 50%; display: none; }
.piano .key.sc i { display: block; background: var(--accent2); }
.piano .key.ton i { background: var(--fT); width: 13px; height: 13px; box-shadow: 0 0 0 2px #fff; }
.piano .white.sc { background: color-mix(in srgb, var(--accent2) 22%, #f7f8fb); }
.piano .black.sc { background: color-mix(in srgb, var(--accent2) 30%, #1b1f29); }
.piano .key.ch { background: #b07cff !important; color: #fff; }
.piano .key.ch i { background: #fff; display: block; }
.piano .key .kn { visibility: hidden; }
.piano .key.sc .kn, .piano .key.ch .kn { visibility: visible; }
.piano .key.hit { filter: brightness(.82); }

/* ---------- lists ---------- */
.panels { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 16px; }
.scale-list, .prog-list { display: grid; gap: 6px; margin-top: 10px; }
.srow {
  display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 8px; text-align: left;
  border: 1px solid var(--line); background: var(--bg2); border-radius: 12px; padding: 8px 8px 8px 12px; width: 100%;
}
.srow:hover { border-color: var(--accent); }
.srow.on { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--bg2)); }
.srow .t { display: block; font-weight: 700; }
.srow .n { display: block; font-size: .85rem; letter-spacing: .2px; margin-top: 1px; }
.srow .d { display: block; font-size: .74rem; color: var(--muted); margin-top: 2px; }
.srow .grp { font-size: .66rem; text-transform: uppercase; letter-spacing: .6px; color: var(--accent); font-weight: 700; }
.mini {
  width: 38px; height: 38px; border-radius: 50%; border: 0; background: var(--accent); color: #fff; font-size: .9rem;
  display: grid; place-items: center; flex: none;
}
.mini.stop { background: #e0445a; }
.prow { border: 1px solid var(--line); background: var(--bg2); border-radius: 12px; padding: 8px 8px 8px 12px; display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: center; }
.prow.playing { border-color: var(--accent); }
.prow .t { font-weight: 700; font-size: .92rem; }
.prow .chs { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 5px; }
.pc { --fn: var(--accent); padding: 3px 7px; font-size: .85rem; gap: 4px; }

.howto { margin-top: 16px; }
.steps { margin: 8px 0 4px; padding-left: 20px; display: grid; gap: 7px; line-height: 1.45; }
.foot { text-align: center; padding: 10px 18px 30px; color: var(--muted); font-size: .9rem; }
.foot p { margin: 4px 0; }
.foot .dev { color: var(--text); }
.foot .dev a { color: var(--accent); font-weight: 600; text-decoration: none; }
.foot .dev a:hover { text-decoration: underline; }

#toast {
  position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); opacity: 0;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 12px; font-size: .92rem;
  transition: .2s; pointer-events: none; z-index: 60; max-width: 90vw; text-align: center;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }
dialog { border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); color: var(--text); max-width: 460px; width: calc(100% - 32px); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(0,0,0,.5); }
dialog h3 { margin-top: 0; }
.keys { width: 100%; border-collapse: collapse; margin-bottom: 10px; }
.keys td { padding: 6px 4px; border-bottom: 1px solid var(--line); }
kbd { display: inline-block; padding: 2px 7px; border-radius: 6px; border: 1px solid var(--line); background: var(--bg2); font-size: .82rem; font-family: inherit; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .panels { grid-template-columns: 1fr; }
  .chord-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .top { grid-template-columns: 1fr auto; row-gap: 10px; }
  .maker-logo { grid-column: 1 / -1; grid-row: 1; }
  .maker-logo img { height: 30px; }
  .brand { font-size: 1.1rem; white-space: nowrap; gap: 8px; }
  .brand img { width: 30px; height: 30px; }
  main { padding: 0 10px 16px; }
  .wheel-card { padding: 10px 8px 14px; }
  .key-head h1 { font-size: 1.55rem; }
  .piano { height: 120px; }
  .piano .key { font-size: .6rem; }
  .piano .black { font-size: .5rem; }
  #staff { width: 130px; }
}
@media (prefers-reduced-motion: reduce) {
  #rotor, .lab { transition: none; }
  .seg.pulse .cell { animation: none; }
}