/* Bryan's look: warm near-black brown, amber accents, Plex. Kept as he had it. */
:root {
  --bg: #1a1714;
  --panel: #221e1a;
  --raised: #2b2621;
  --line: #3a332c;
  --text: #f1e9df;
  --muted: #a8998a;
  --faint: #7a6e62;
  --amber: #e8a33a;
  --amber-ink: #1a1207;
  --amber-soft: #f0b95e;
  --f-body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --f-mono: "IBM Plex Mono", Consolas, monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; }
html { background: var(--bg); }
body { background: var(--bg); color: var(--text); font: 15px/1.5 var(--f-body); }
a { color: var(--amber); }
.wrap { max-width: 880px; margin: 0 auto; padding: 18px 16px 60px; }

.crumb { display: flex; justify-content: space-between; gap: 12px; font-size: 13px; color: var(--muted); flex-wrap: wrap; }
.crumb a { text-decoration: none; color: var(--muted); }
.crumb a:hover { color: var(--amber); }
.credit strong { color: var(--text); }

.head h1 { font-size: 34px; font-weight: 700; margin: 26px 0 8px; letter-spacing: -.01em; }
.lede { font-size: 16px; color: var(--muted); margin: 0 0 14px; }
.lede b { color: var(--amber-soft); font-weight: 600; }
.notebox { border-left: 3px solid var(--amber); padding: 6px 12px; margin: 0 0 22px; color: var(--muted); font-size: 13px; background: #ffffff05; }

.tabs { display: inline-flex; gap: 4px; padding: 4px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); margin-bottom: 18px; }
.tabs button { background: transparent; border: 0; color: var(--muted); font: 600 14px var(--f-body); padding: 8px 14px; border-radius: 6px; cursor: pointer; }
.tabs button.on { background: var(--amber); color: var(--amber-ink); }

.hint { color: var(--muted); font-size: 13px; margin: 0 0 16px; }
.group { margin-bottom: 14px; }
.glabel { display: block; font-size: 12px; font-weight: 600; color: var(--muted); margin-bottom: 6px; }
.keys { display: flex; flex-wrap: wrap; gap: 8px; }
.keys button {
  display: inline-flex; align-items: center; gap: 8px; background: var(--panel); border: 1px solid var(--line); color: var(--text);
  border-radius: 8px; padding: 9px 14px; font: 600 15px var(--f-body); cursor: pointer; min-width: 52px;
}
.keys button::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--faint); }
.keys button.on { border-color: var(--amber); background: #e8a33a14; }
.keys button.on::before { background: var(--amber); box-shadow: 0 0 6px var(--amber); }
.keys button:hover { border-color: var(--muted); }

/* cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 14px; margin: 22px 0 18px; }
.card { position: relative; perspective: 1000px; min-height: 250px; }
.card .inner { position: relative; width: 100%; height: 100%; min-height: 250px; transition: transform .45s; transform-style: preserve-3d; }
.card.flipped .inner { transform: rotateY(180deg); }
.face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; display: flex; flex-direction: column;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 12px 10px; cursor: pointer;
}
.face.back { transform: rotateY(180deg); }
.face:hover { border-color: var(--amber); }
.kicker { font-size: 11px; font-weight: 600; color: var(--amber); }
.cname { font-size: 20px; font-weight: 700; margin: 2px 0 4px; }
.cname .alt { font-size: 12px; font-weight: 500; color: var(--muted); margin-left: 6px; }
.diagram { display: block; width: 100%; height: auto; margin: 4px auto 6px; }
.cnote { font-size: 12px; color: var(--muted); }
.cfoot { margin-top: auto; display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--faint); padding-top: 8px; }
.hear { background: transparent; border: 1px solid var(--line); color: var(--amber); border-radius: 6px; padding: 2px 8px; font: 500 13px var(--f-body); cursor: pointer; }
.hear:hover { border-color: var(--amber); }
.hear.on { background: var(--amber); color: var(--amber-ink); }
.why { font: 500 14px/1.7 var(--f-mono); color: var(--text); margin: 6px 0; }
.why b { color: var(--amber-soft); }
.why-text { font-size: 13px; color: var(--muted); }

.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; font: 12px var(--f-mono); color: var(--muted); border-top: 1px solid var(--line); padding-top: 12px; margin: 10px 0; }
.legend .mine, .glabel .mine, .mine { color: var(--amber-soft); }
.glabel .mine { font-weight: 400; margin-left: 6px; }
.foot-note { font-size: 12px; color: var(--faint); max-width: 520px; }

/* capo finder */
.result { border: 1px solid var(--line); border-radius: 12px; background: var(--panel); padding: 20px; text-align: center; margin: 22px 0 18px; }
.r-label { font-size: 12px; color: var(--muted); font-weight: 600; }
.r-fret { font-size: 54px; font-weight: 700; color: var(--amber); line-height: 1.1; }
.r-text { color: var(--muted); font-size: 14px; margin-bottom: 12px; }
.btn { background: var(--amber); color: var(--amber-ink); border: 0; border-radius: 6px; padding: 8px 14px; font: 600 13px var(--f-body); cursor: pointer; }
.btn:hover { filter: brightness(1.08); }
.allshapes { margin-bottom: 18px; }
.shape-strip { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.shape-strip button { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 6px; cursor: pointer; color: var(--text); display: flex; flex-direction: column; align-items: center; gap: 2px; }
.shape-strip button .sh { font-size: 12px; color: var(--muted); }
.shape-strip button .fr { font-size: 24px; font-weight: 700; color: var(--amber); }
.shape-strip button .hi { font-size: 11px; color: var(--faint); }
.shape-strip button.on { border-color: var(--amber); }
.shape-strip button.best .hi { color: var(--amber-soft); }
.family table { width: 100%; border-collapse: collapse; font-size: 14px; }
.family th { text-align: left; font-size: 12px; color: var(--muted); font-weight: 600; padding: 8px 10px; border-bottom: 1px solid var(--line); }
.family td { padding: 8px 10px; border-bottom: 1px solid #ffffff08; }
.family td:first-child { color: var(--muted); font-family: var(--f-mono); }
.family .chordlink { background: none; border: 0; color: var(--text); font: 600 14px var(--f-body); cursor: pointer; padding: 0; }
.family .chordlink.sound { color: var(--amber); }
.family .chordlink:hover { text-decoration: underline; }
.tiny { font-size: 12px; color: var(--faint); margin: 8px 0 0; }
.prog { margin: 24px 0 18px; }
.prog-row { display: flex; gap: 8px; margin-top: 8px; }
.prog-row input { flex: 1; background: var(--panel); border: 1px solid var(--line); color: var(--text); border-radius: 8px; padding: 9px 12px; font: 500 16px var(--f-mono); }
.prog-row select { background: var(--panel); border: 1px solid var(--line); color: var(--text); border-radius: 8px; padding: 0 10px; font: 500 13px var(--f-body); }
.prog-out { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; min-height: 30px; }
.prog-out .pc { display: inline-flex; flex-direction: column; align-items: center; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 6px 12px; min-width: 64px; }
.prog-out .pc b { font-size: 18px; color: var(--amber); }
.prog-out .pc span { font-size: 11px; color: var(--muted); }
.prog-out .pc.bad b { color: var(--faint); }

.credits { margin-top: 40px; border-top: 1px solid var(--line); padding-top: 14px; font-size: 13px; color: var(--muted); }
.credits strong { color: var(--text); }

@media (max-width: 560px) {
  .head h1 { font-size: 28px; }
  .shape-strip { grid-template-columns: repeat(3, 1fr); }
  .cards { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}