/* Learn Piano
 * Layout: top bar, a settings column next to a big staff card, and the piano docked at the bottom
 * like a real instrument under the music. Ink on paper-white, with a deep plum accent and an amber
 * highlight for keys you are holding.
 */
:root {
	--paper: #f7f6f2;
	--card: #ffffff;
	--ink: #1d2433;
	--muted: #5d6677;
	--line: #e3e1da;
	--plum: #2b2350;
	--plum-2: #4a3d8f;
	--amber: #f0b429;
	--ok: #1f8a5b;
	--bad: #c0392b;
	--hint: #3a7bd5;
	--radius: 16px;
	--font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
	color-scheme: light;
}
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body { height: 100dvh; overflow: hidden; }
body {
	margin: 0; background: var(--paper); color: var(--ink); font: 400 16px/1.5 var(--font);
	display: grid; grid-template-rows: auto 1fr auto; grid-template-columns: minmax(0, 1fr); min-height: 100dvh;
	padding: env(safe-area-inset-top) env(safe-area-inset-right) 0 env(safe-area-inset-left);
}
button { font: inherit; color: inherit; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--plum-2); outline-offset: 2px; border-radius: 6px; }
.muted { color: var(--muted); }

/* ---------- top bar ---------- */
.topbar { display: flex; align-items: center; gap: 16px; padding: 12px 20px; background: var(--plum); color: #fff; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -.01em; font-size: 1.1rem; }
.brand-mark { display: inline-flex; gap: 2px; height: 22px; align-items: flex-start; }
.brand-mark i { width: 7px; height: 22px; background: #fff; border-radius: 0 0 2px 2px; position: relative; }
.brand-mark i:nth-child(1)::after, .brand-mark i:nth-child(2)::after { content: ""; position: absolute; right: -4px; top: 0; width: 5px; height: 13px; background: var(--plum); border: 1px solid #fff; border-top: 0; border-radius: 0 0 2px 2px; z-index: 1; }
.tabs { display: flex; gap: 4px; margin-right: auto; }
.tab { background: none; border: 0; color: rgba(255,255,255,.75); padding: 8px 14px; border-radius: 999px; cursor: pointer; font-weight: 600; }
.tab[aria-selected="true"] { background: rgba(255,255,255,.14); color: #fff; }
.top-actions { display: flex; gap: 10px; align-items: center; }
.midi-pill { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.25); color: #fff; padding: 7px 14px; border-radius: 999px; cursor: pointer; font-size: .9rem; max-width: 260px; }
.midi-pill span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.midi-pill .dot { width: 9px; height: 9px; border-radius: 50%; background: #9aa0b4; flex: none; }
.midi-pill[data-state="on"] .dot { background: #3ddc84; box-shadow: 0 0 8px #3ddc84; }
.midi-pill[data-state="unsupported"] .dot { background: var(--amber); }
.lang { display: inline-flex; border: 1px solid rgba(255,255,255,.25); border-radius: 999px; overflow: hidden; }
.lang button { background: none; border: 0; color: rgba(255,255,255,.7); padding: 6px 10px; cursor: pointer; font-weight: 700; font-size: .8rem; }
.lang button[aria-pressed="true"] { background: #fff; color: var(--plum); }

/* ---------- practice view ---------- */
main { min-height: 0; overflow-y: auto; -webkit-overflow-scrolling: touch; }
.view { display: grid; grid-template-columns: 300px 1fr; gap: 24px; max-width: 1200px; margin: 0 auto; padding: 24px 20px; }
.settings { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; align-self: start; display: grid; gap: 18px; }
.settings-title { font-size: .8rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin: 0; }
.field { display: grid; gap: 8px; }
.label { font-weight: 600; font-size: .9rem; }
.seg { display: flex; flex-wrap: wrap; gap: 6px; }
.seg button { flex: 1 1 auto; background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; cursor: pointer; font-size: .9rem; }
.seg button[aria-pressed="true"] { background: var(--plum); border-color: var(--plum); color: #fff; }
.seg button:disabled { opacity: .45; cursor: not-allowed; }
select { font: inherit; padding: 8px 10px; border-radius: 10px; border: 1px solid var(--line); background: var(--paper); color: var(--ink); }
.toggles { gap: 10px; }
.toggle { display: flex; align-items: center; gap: 10px; cursor: pointer; font-size: .95rem; }
.toggle input { width: 18px; height: 18px; accent-color: var(--plum); }

.stage { display: grid; gap: 14px; align-content: start; min-width: 0; }
.stage-head { display: flex; gap: 16px; align-items: baseline; color: var(--muted); font-size: .95rem; font-variant-numeric: tabular-nums; min-height: 1.5em; }
.stage-head .timer { margin-left: auto; }
.key-info { font-weight: 600; color: var(--plum-2); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px 24px; display: grid; gap: 10px; box-shadow: 0 1px 2px rgba(29,36,51,.04), 0 12px 30px -18px rgba(29,36,51,.25); }
.prompt { margin: 0; font-weight: 700; font-size: 1.15rem; }
.staff { width: 100%; max-width: 620px; margin: 0 auto; }
.staff svg { width: 100%; height: auto; display: block; }
.feedback { min-height: 1.6em; margin: 0; text-align: center; font-weight: 600; color: var(--muted); }
.feedback.is-ok { color: var(--ok); }
.feedback.is-bad { color: var(--bad); }
.actions { display: flex; justify-content: center; }
.btn { border: 0; border-radius: 999px; padding: 12px 24px; font-weight: 700; cursor: pointer; }
.btn-primary { background: var(--plum); color: #fff; }
.btn-primary:hover { background: var(--plum-2); }
.btn-ghost { background: none; border: 1px solid var(--line); color: var(--ink); }

.names { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.name-btn { min-width: 52px; padding: 12px 0; border-radius: 12px; border: 1px solid var(--line); background: var(--paper); font-weight: 700; font-size: 1.1rem; cursor: pointer; }
.name-btn:hover { border-color: var(--plum-2); }
.name-btn.acc { min-width: 44px; color: var(--plum-2); }
.name-btn.acc[aria-pressed="true"] { background: var(--plum); color: #fff; border-color: var(--plum); }

.result { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; display: grid; gap: 14px; justify-items: start; }
.result h3 { margin: 0; font-size: 1.2rem; }
.result-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; width: 100%; }
.result-grid div { background: var(--paper); border-radius: 12px; padding: 14px; display: grid; }
.result-grid strong { font-size: 1.8rem; font-variant-numeric: tabular-nums; color: var(--plum); }
.result-grid span { color: var(--muted); font-size: .9rem; }

/* ---------- play ---------- */
.view-play { grid-template-columns: minmax(0, 1fr); }
.play-bar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.play-bar .seg { flex: 0 1 auto; }
.play-bar select { min-width: 220px; flex: 1 1 220px; max-width: 360px; }
.play-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 0 22px; display: grid; gap: 10px; box-shadow: 0 1px 2px rgba(29,36,51,.04), 0 12px 30px -18px rgba(29,36,51,.25); min-width: 0; }
.play-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 0 24px; }
.play-head h2 { margin: 0; font-size: 1.2rem; }
.play-score { font-weight: 700; font-variant-numeric: tabular-nums; color: var(--plum-2); }
.score-view { position: relative; overflow: hidden; }
.score-track { position: relative; width: max-content; transition: transform .35s ease; will-change: transform; padding-left: 12px; }
.playhead { position: absolute; top: 0; left: 12px; width: 4px; margin-left: -2px; border-radius: 2px; background: var(--amber); opacity: .85; transition: transform .25s ease; z-index: 2; pointer-events: none; box-shadow: 0 0 10px rgba(240,180,41,.7); }
#playheadWrap.done .playhead { opacity: 0; }
#scoreSvg svg { display: block; }
#scoreSvg .st-cur * { fill: var(--plum-2); stroke: var(--plum-2); }
#scoreSvg .st-ok * { fill: var(--ok); stroke: var(--ok); }
#scoreSvg .st-bad * { fill: var(--bad); stroke: var(--bad); }
.play-status { margin: 0; min-height: 1.6em; text-align: center; font-weight: 600; color: var(--muted); padding: 0 16px; }
.play-status.is-ok { color: var(--ok); }
.play-status.is-bad { color: var(--bad); }
.play-card .result { margin: 0 24px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- stats ---------- */
#view-stats { grid-template-columns: 1fr; }
.stats-wrap { max-width: 900px; width: 100%; margin: 0 auto; display: grid; gap: 14px; justify-items: start; }
.stats-wrap h2 { margin: 0; }
#statsBody { width: 100%; }
.stats-wrap h3 { margin: 10px 0 0; font-size: 1rem; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(84px, 1fr)); gap: 8px; width: 100%; }
.stat-cell { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px; display: grid; gap: 2px; font-variant-numeric: tabular-nums; }
.stat-cell span { font-size: .8rem; color: var(--muted); }
.stat-cell.good { border-color: rgba(31,138,91,.45); background: #eef8f2; }
.stat-cell.mid { border-color: rgba(240,180,41,.6); background: #fff8e6; }
.stat-cell.low { border-color: rgba(192,57,43,.45); background: #fdeeec; }
.empty { color: var(--muted); }

/* ---------- piano ---------- */
.piano-dock { min-width: 0; background: #16122b; padding: 10px 12px calc(12px + env(safe-area-inset-bottom)); }
.midi-help { margin: 0 auto 8px; max-width: 1200px; color: #c9c4e0; font-size: .85rem; text-align: center; }
.kb-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: thin; }
.kb { position: relative; height: 150px; min-width: 760px; max-width: 1400px; margin: 0 auto; user-select: none; touch-action: manipulation; }
.key { position: absolute; top: 0; border: 0; padding: 0; cursor: pointer; display: flex; align-items: flex-end; justify-content: center; }
.key-white { height: 100%; background: linear-gradient(#fff, #f2f0ea); border: 1px solid #bdb8ab; border-radius: 0 0 6px 6px; z-index: 1; }
.key-black { height: 62%; background: linear-gradient(#2a2a2e, #0f0f12); border-radius: 0 0 4px 4px; z-index: 2; box-shadow: 0 2px 3px rgba(0,0,0,.4); }
.key-label { font-size: 11px; color: #8a8576; padding-bottom: 6px; pointer-events: none; font-weight: 600; }
.key-label.key-c4 { color: var(--plum-2); }
.key.down.key-white { background: linear-gradient(#ffe7a6, var(--amber)); }
.key.down.key-black { background: linear-gradient(#b8860b, #7a5800); }
.key.ok.key-white { background: linear-gradient(#c9f0db, #6fcf97); }
.key.ok.key-black { background: linear-gradient(#2f9e66, #1f6e47); }
.key.hint.key-white { background: linear-gradient(#d6e6fb, #8db7ef); }
.key.hint.key-black { background: linear-gradient(#4b84d6, #2a5ea8); }

@media (max-width: 860px) {
	.view { grid-template-columns: 1fr; padding: 14px; gap: 14px; }
	.settings { order: 2; }
	.topbar { padding: 10px 14px; gap: 10px; }
	.tabs { order: 3; width: 100%; }
	.top-actions { margin-left: auto; }
	.midi-pill { max-width: 170px; }
	.card { padding: 16px; }
	.kb { height: 120px; }
	.midi-help { font-size: .75rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
	.brand-name { font-size: 1rem; }
	.result-grid { grid-template-columns: 1fr 1fr 1fr; }
	.result-grid strong { font-size: 1.4rem; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }