:root {
  --bg: #f5ede2;
  --surface: #fffaf3;
  --surface-2: #efe3d3;
  --text: #2a1c13;
  --muted: #7d6a5a;
  --line: #e2d3c0;
  --accent: #b8690f;
  --accent-ink: #fff8ee;
  --accent-soft: #f6e0bf;
  --wood: #4a2f20;
  --string: #9c8259;
  --fret: #b9a58a;
  --dot: #2a1c13;
  --dot-ink: #fff8ee;
  --good: #2f8a4c;
  --warn: #c98a12;
  --r: #c2410c;
  --third: #2563a8;
  --fifth: #2f8a4c;
  --seventh: #8b4bb8;
  --ext: #7d6a5a;
  --shadow: 0 1px 2px rgba(60, 35, 15, .06), 0 6px 24px rgba(60, 35, 15, .07);
  --radius: 18px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #17110d;
    --surface: #221913;
    --surface-2: #2e231b;
    --text: #f3e8dc;
    --muted: #b09d8b;
    --line: #3a2d23;
    --accent: #eda645;
    --accent-ink: #1d130b;
    --accent-soft: #3d2b17;
    --wood: #0f0a07;
    --string: #cdb68a;
    --fret: #5f4d3e;
    --dot: #f3e8dc;
    --dot-ink: #1d130b;
    --good: #5cc27d;
    --warn: #e6b04a;
    --r: #f07a45;
    --third: #6aa8ee;
    --fifth: #5cc27d;
    --seventh: #c08ae6;
    --ext: #b09d8b;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 28px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #17110d; --surface: #221913; --surface-2: #2e231b; --text: #f3e8dc; --muted: #b09d8b; --line: #3a2d23;
  --accent: #eda645; --accent-ink: #1d130b; --accent-soft: #3d2b17; --wood: #0f0a07; --string: #cdb68a; --fret: #5f4d3e;
  --dot: #f3e8dc; --dot-ink: #1d130b; --good: #5cc27d; --warn: #e6b04a; --r: #f07a45; --third: #6aa8ee; --fifth: #5cc27d;
  --seventh: #c08ae6; --ext: #b09d8b; color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "IBM Plex Sans KR", system-ui, -apple-system, "Apple SD Gothic Neo", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  padding-bottom: calc(76px + env(safe-area-inset-bottom));
  overflow-x: hidden;
}
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.center { text-align: center; }
code { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: .85em; letter-spacing: .04em; }

/* ---------- 헤더 ---------- */
.top {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 10px;
  padding: calc(10px + env(safe-area-inset-top)) 16px 10px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.brand { margin-right: auto; display: flex; align-items: center; gap: 8px; font-family: "Gowun Dodum", sans-serif; font-size: 1.15rem; font-weight: 700; white-space: nowrap; }
.pick { width: 20px; height: 22px; background: var(--accent); border-radius: 50% 50% 50% 50% / 38% 38% 62% 62%; transform: rotate(180deg); }

main { max-width: 560px; margin: 0 auto; padding: 14px 16px 24px; }

/* ---------- 검색 ---------- */
.search { display: flex; gap: 8px; }
.search input {
  flex: 1; min-width: 0;
  height: 50px; padding: 0 16px;
  border: 1.5px solid var(--line); border-radius: 14px;
  background: var(--surface);
  font-size: 1.15rem; font-weight: 600; letter-spacing: .02em;
  outline: none;
}
.search input:focus { border-color: var(--accent); }
.btn {
  border: 1.5px solid var(--line); background: var(--surface);
  height: 44px; padding: 0 16px; border-radius: 12px; font-weight: 600;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; text-decoration: none; color: var(--text);
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.search .btn { height: 50px; padding: 0 20px; border-radius: 14px; }
.btn.block { display: flex; width: 100%; }
.btn.big { height: 54px; font-size: 1.05rem; }
.btn.small { height: 34px; padding: 0 12px; font-size: .85rem; border-radius: 10px; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--accent); }
.btn.on { background: var(--text); border-color: var(--text); color: var(--bg); }

.picker { margin-top: 12px; display: grid; gap: 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.chips.scroll { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; margin: 0 -16px; padding: 0 16px; }
.chips.scroll::-webkit-scrollbar { display: none; }
.chip {
  flex: none; border: 1.5px solid var(--line); background: var(--surface);
  min-width: 40px; height: 36px; padding: 0 11px; border-radius: 10px;
  font-weight: 600; font-size: .9rem;
}
.chip.on { background: var(--text); border-color: var(--text); color: var(--bg); }
.chip.ghost { height: 30px; border-color: transparent; background: var(--surface-2); font-size: .85rem; }
.chip.big { height: 42px; padding: 0 16px; font-size: 1rem; }
.recent { margin-top: 12px; min-height: 0; }
.recent:empty { display: none; }

.settings { display: flex; gap: 8px; margin-top: 12px; }
.sel { flex: 1; display: flex; align-items: center; gap: 8px; background: var(--surface); border: 1.5px solid var(--line); border-radius: 12px; padding: 0 10px; height: 44px; min-width: 0; }
.sel > span { font-size: .8rem; color: var(--muted); flex: none; font-weight: 600; }
.sel select { flex: 1; min-width: 0; border: 0; background: transparent; outline: none; font-weight: 600; font-size: .92rem; height: 100%; }
.sel.compact { flex: none; height: 36px; }

/* ---------- 카드 ---------- */
.card { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; margin-top: 14px; }
.card.empty { text-align: left; }
.card.center { text-align: center; }
.chord-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.symbol { font-family: "Gowun Dodum", sans-serif; font-size: 2.6rem; line-height: 1; margin: 2px 0 6px; letter-spacing: -.01em; }
.chord-head p { margin: 0; }
.head-actions { display: flex; gap: 8px; }
.icon-btn { border: 0; width: 46px; height: 46px; border-radius: 50%; background: var(--surface-2); color: var(--text); display: grid; place-items: center; }
.icon-btn.fav { color: var(--accent); background: var(--accent-soft); }
.icon-btn.small { width: 34px; height: 34px; }
#play-btn { background: var(--accent); color: var(--accent-ink); }
.tones { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.tone-chip { display: inline-flex; align-items: baseline; gap: 5px; padding: 4px 10px; border-radius: 8px; background: var(--surface-2); font-weight: 600; font-size: .92rem; }
.tone-chip b { font-size: .72rem; }
.tone-chip i { font-style: normal; font-size: .7rem; color: var(--muted); font-weight: 400; }
.role-r b { color: var(--r); } .role-third b { color: var(--third); } .role-fifth b { color: var(--fifth); } .role-seventh b { color: var(--seventh); } .role-ext b { color: var(--ext); }
.capo-note { margin: 12px 0 0; padding: 8px 12px; background: var(--accent-soft); border-radius: 10px; font-size: .9rem; }

/* ---------- 다이어그램 ---------- */
.voicing { display: flex; align-items: center; justify-content: center; gap: 4px; margin-top: 10px; touch-action: pan-y; }
.diagram-wrap { width: min(260px, 70vw); }
.diagram { width: 100%; height: auto; display: block; }
.diagram .nut { fill: var(--text); }
.diagram .fret { stroke: var(--fret); stroke-width: 1.5; }
.diagram .string { stroke: var(--string); }
.diagram .dot { fill: var(--dot); }
.diagram .finger { fill: var(--dot-ink); font-size: 12px; font-weight: 700; font-family: inherit; }
.diagram .mark.mute { fill: var(--muted); font-size: 17px; font-weight: 600; }
.diagram .mark.open { fill: none; stroke: var(--text); stroke-width: 1.8; }
.diagram .fretnum { fill: var(--muted); font-size: 14px; font-weight: 700; }
.diagram .notename { fill: var(--muted); font-size: 12px; font-weight: 600; }
.nav { border: 0; background: transparent; width: 40px; height: 64px; border-radius: 12px; color: var(--text); display: grid; place-items: center; flex: none; }
.nav:disabled { opacity: .2; }
.voicing-meta { display: flex; flex-direction: column; align-items: center; gap: 6px; margin-top: 6px; }
.pager { display: flex; gap: 5px; }
.pager i { width: 6px; height: 6px; border-radius: 50%; background: var(--line); }
.pager i.on { background: var(--accent); width: 18px; border-radius: 3px; }

/* ---------- 튜너 ---------- */
.tuner { margin-top: 0; }
.tuner-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.tuner-display { margin: 14px 0 10px; padding: 18px 12px 12px; border-radius: 16px; background: var(--surface-2); text-align: center; transition: background .2s; }
.tuner-display.in-tune { background: color-mix(in srgb, var(--good) 18%, var(--surface-2)); }
.tuner-display.close { background: color-mix(in srgb, var(--warn) 14%, var(--surface-2)); }
.meter { position: relative; height: 110px; overflow: hidden; }
.arc { position: absolute; left: 50%; bottom: -120px; width: 240px; height: 240px; margin-left: -120px; border-radius: 50%;
  background: conic-gradient(from -70deg, var(--line) 0 63deg, var(--good) 63deg 77deg, var(--line) 77deg 140deg, transparent 140deg);
  -webkit-mask: radial-gradient(circle, transparent 104px, #000 105px); mask: radial-gradient(circle, transparent 104px, #000 105px); }
.needle { position: absolute; left: 50%; bottom: 0; width: 3px; height: 104px; margin-left: -1.5px; background: var(--muted); border-radius: 2px; transform-origin: 50% 100%; transition: transform .12s ease-out; }
.live .needle { background: var(--accent); }
.in-tune .needle { background: var(--good); }
.scale { position: absolute; bottom: 0; left: 0; right: 0; display: flex; justify-content: space-between; font-size: .75rem; color: var(--muted); padding: 0 4px; }
.readout .note { font-family: "Gowun Dodum", sans-serif; font-size: 4rem; line-height: 1; font-weight: 700; margin-top: 4px; }
.readout .sub { display: flex; justify-content: center; gap: 12px; color: var(--muted); font-weight: 600; margin-top: 4px; min-height: 1.5em; }
.in-tune .cents { color: var(--good); }
.hint { margin: 8px 0 0; font-weight: 600; }
.hz { margin: 2px 0 0; min-height: 1.3em; }
.strings { justify-content: center; margin: 8px 0 6px; }
.chip.str { display: inline-flex; align-items: center; gap: 4px; height: 44px; min-width: 48px; font-size: 1rem; }
.chip.str small { font-size: .65rem; color: var(--muted); }
.chip.str.on small { color: inherit; }
.chip.str.hit { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
#tuner-toggle { margin-top: 14px; }

/* ---------- 내 저장 ---------- */
.big-icon { color: var(--accent); margin: 6px 0 4px; }
.card h3 { margin: 0; font-size: 1.05rem; }
.card.center h3 { margin: 6px 0; }
.sec-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; gap: 8px; }
.list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.list li { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 10px 0; border-top: 1px solid var(--line); }
.list li:first-child { border-top: 0; padding-top: 0; }
.list li > div:first-child { display: flex; flex-direction: column; min-width: 0; }
.row { display: flex; gap: 6px; align-items: center; flex: none; }
.song { width: 100%; }
.song-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.chips.prog { margin-top: 8px; }
.memo { margin: 8px 0 0; white-space: pre-wrap; color: var(--muted); font-size: .9rem; }

/* ---------- 탭바 ---------- */
.tabs {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  display: flex; justify-content: space-around;
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
}
.tab-btn { flex: 1; max-width: 140px; border: 0; background: transparent; display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 6px 0; color: var(--muted); font-size: .75rem; font-weight: 600; border-radius: 12px; }
.tab-btn[aria-current="page"] { color: var(--accent); }

/* ---------- 시트 / 폼 / 토스트 ---------- */
.sheet { position: fixed; inset: 0; z-index: 50; background: rgba(15, 8, 3, 0); display: flex; align-items: flex-end; justify-content: center; transition: background .2s; }
.sheet.open { background: rgba(15, 8, 3, .45); }
.sheet-panel { position: relative; width: 100%; max-width: 560px; background: var(--surface); border-radius: 22px 22px 0 0; padding: 24px 18px calc(22px + env(safe-area-inset-bottom)); transform: translateY(100%); transition: transform .22s ease-out; max-height: 88vh; overflow-y: auto; }
.sheet.open .sheet-panel { transform: none; }
.sheet-panel h3 { margin: 0 0 6px; font-size: 1.15rem; }
.sheet-panel > div > p { margin: 0 0 16px; }
.sheet-close { position: absolute; top: 10px; right: 10px; width: 36px; height: 36px; border: 0; border-radius: 50%; background: var(--surface-2); font-size: 1.3rem; line-height: 1; }
.form { display: grid; gap: 12px; margin-top: 12px; }
.form label { display: grid; gap: 4px; font-size: .85rem; font-weight: 600; color: var(--muted); }
.form input, .form textarea, .form select { border: 1.5px solid var(--line); border-radius: 10px; background: var(--bg); padding: 10px 12px; font-size: 1rem; color: var(--text); font-weight: 400; outline: none; }
.form input:focus, .form textarea:focus { border-color: var(--accent); }
.string-pickers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.sp select { padding: 8px 6px; }
.toast { position: fixed; left: 50%; bottom: calc(86px + env(safe-area-inset-bottom)); transform: translate(-50%, 20px); opacity: 0; pointer-events: none; background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 12px; font-size: .9rem; font-weight: 600; transition: all .2s; z-index: 60; max-width: calc(100% - 32px); text-align: center; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (min-width: 600px) {
  .symbol { font-size: 3rem; }
}
.saved-note { margin: 0 4px; }

/* ---------- 코드 원리 설명 ---------- */
.explain { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 12px; }
.explain summary { cursor: pointer; font-weight: 700; list-style: none; display: flex; align-items: center; justify-content: space-between; padding: 4px 0; }
.explain summary::-webkit-details-marker { display: none; }
.explain summary::after { content: "＋"; color: var(--accent); font-weight: 700; }
.explain[open] summary::after { content: "－"; }
.ex-body h4 { margin: 14px 0 4px; font-size: .95rem; }
.ex-body p { margin: 4px 0; }
.ex-steps { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 6px; }
.ex-steps li { display: grid; grid-template-columns: 2.6em 1fr auto; align-items: baseline; gap: 8px; padding: 8px 10px; border-radius: 10px; background: var(--surface-2); border-left: 4px solid var(--ext); }
.ex-steps li b { font-size: 1.05rem; }
.ex-steps li em { font-style: normal; font-size: .8rem; color: var(--muted); }
.ex-steps li i { grid-column: 2 / -1; font-style: normal; font-size: .75rem; color: var(--muted); margin-top: -4px; }
.ex-steps .role-r { border-left-color: var(--r); } .ex-steps .role-third { border-left-color: var(--third); }
.ex-steps .role-fifth { border-left-color: var(--fifth); } .ex-steps .role-seventh { border-left-color: var(--seventh); }
.formula { margin-top: 10px !important; font-size: .9rem; color: var(--muted); }
.formula code { color: var(--text); font-size: 1rem; font-weight: 600; margin-left: 6px; }
.ex-char { background: var(--accent-soft); border-radius: 10px; padding: 10px 12px; font-size: .92rem; margin-top: 10px !important; }
.ex-strings { list-style: none; margin: 8px 0 0; padding: 0; }
.ex-strings li { display: grid; grid-template-columns: 3.6em 1fr auto; gap: 8px; align-items: baseline; padding: 7px 2px; border-top: 1px solid var(--line); font-size: .92rem; }
.ex-strings li:first-child { border-top: 0; }
.ex-strings .sn { color: var(--muted); font-size: .82rem; font-weight: 600; }
.ex-strings .pos { color: var(--muted); }
.ex-strings .role-r b { color: var(--r); } .ex-strings .role-third b { color: var(--third); } .ex-strings .role-fifth b { color: var(--fifth); }
.ex-strings .role-seventh b { color: var(--seventh); } .ex-strings .role-ext b { color: var(--ext); }
.ex-notes { margin: 12px 0 0; padding-left: 18px; display: grid; gap: 6px; font-size: .9rem; }