/* eart — one stylesheet. Plain and calm: paper, ink, one warm accent. */
:root {
  color-scheme: light dark;
  --ink: #18202e;
  --bg: #f7f4ee;
  --panel: #ffffff;
  --line: #e2ddd2;
  --muted: #5e6675;
  --accent: #1d2a44;
  --accent-ink: #ffffff;
  --warm: #c98a12;
  --good: #1d7f52;
  --good-bg: #e3f3ea;
  --bad: #b23b3b;
  --bad-bg: #f8e4e2;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8ebf1; --bg: #10141c; --panel: #171c26; --line: #2a3140; --muted: #9aa3b4;
    --accent: #f2b544; --accent-ink: #10141c; --warm: #f2b544;
    --good: #5fd09b; --good-bg: #173326; --bad: #f08a8a; --bad-bg: #3a1d1f;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 980px; margin: 0 auto; padding: 32px 20px 64px; min-height: 70vh; }
h1 { font-size: clamp(28px, 5vw, 42px); line-height: 1.15; letter-spacing: -0.02em; margin: 8px 0 14px; }
h2 { font-size: 22px; letter-spacing: -0.01em; margin: 32px 0 12px; }
h3 { font-size: 17px; margin: 18px 0 6px; }
a { color: inherit; text-underline-offset: 3px; }
p { margin: 0 0 12px; }
kbd { font: 12px ui-monospace, monospace; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: 0 5px; background: var(--panel); }

.muted { color: var(--muted); }
.small { font-size: 14px; }
.big { font-size: 18px; font-weight: 650; }
.ok { color: var(--good); }
.error { color: var(--bad); min-height: 0; }
.hint { color: var(--muted); font-size: 14px; margin-top: 8px; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: 12px; font-weight: 700; color: var(--warm); margin: 0 0 6px; }
.sr-only, .honeypot { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--panel); padding: 8px 12px; z-index: 10; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin: 10px 0; }
.crumbs { font-size: 14px; color: var(--muted); margin: 0; }

/* ── Header and footer ── */
.site-header { display: flex; align-items: center; gap: 22px; padding: 12px 20px; border-bottom: 1px solid var(--line); background: var(--panel); flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 19px; text-decoration: none; letter-spacing: -0.02em; }
.site-header nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-header nav a { text-decoration: none; color: var(--muted); font-weight: 550; }
.site-header nav a[aria-current="page"], .site-header nav a:hover { color: var(--ink); }
.account { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.sync-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.sync-dot[data-state="synced"] { background: var(--good); }
.sync-dot[data-state="syncing"] { background: var(--warm); }
.sync-dot[data-state="error"], .sync-dot[data-state="offline"] { background: var(--bad); }
.claim { display: flex; gap: 12px; align-items: center; justify-content: center; flex-wrap: wrap; padding: 10px 20px; background: var(--good-bg); border-bottom: 1px solid var(--line); }
.claim[hidden] { display: none; }
.site-footer { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; padding: 26px 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; max-width: 980px; margin: 0 auto; }
.site-footer nav { display: flex; gap: 16px; flex-wrap: wrap; }

/* ── Controls ── */
.btn { display: inline-flex; align-items: center; gap: 8px; border: 0; border-radius: 10px; padding: 10px 18px; background: var(--accent); color: var(--accent-ink); font: inherit; font-weight: 650; cursor: pointer; text-decoration: none; }
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn.small { padding: 6px 12px; font-size: 14px; }
.btn kbd { background: transparent; color: inherit; border-color: currentColor; opacity: .7; }
.btn.google { width: 100%; justify-content: center; background: var(--panel); color: var(--ink); border: 1px solid var(--line); }
button.link { text-align: left; background: none; border: 0; padding: 0; font: inherit; font-weight: 650; color: inherit; text-decoration: underline; cursor: pointer; }
input, select, textarea { font: inherit; color: var(--ink); background: var(--panel); border: 1px solid var(--line); border-radius: 9px; padding: 9px 11px; }
input:focus, select:focus, textarea:focus, button:focus-visible, a:focus-visible { outline: 2px solid var(--warm); outline-offset: 2px; }
label { display: block; font-weight: 600; font-size: 14px; margin: 12px 0 4px; }
label.btn { display: inline-flex; margin: 0; }
form.card input:not([type=checkbox]):not([type=file]), form.card textarea, form.card select { width: 100%; }
textarea { min-height: 110px; resize: vertical; }
.or { text-align: center; color: var(--muted); font-size: 13px; margin: 14px 0 0; }

/* ── Layout pieces ── */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin: 14px 0; }
.card h2:first-child, .card h3:first-child { margin-top: 0; }
.card.narrow { max-width: 460px; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 360px), 1fr)); gap: 14px; }
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.grid4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; }
.grid2 > .card, .grid3 > .card, .grid4 > .card { margin: 0; }
.drill-card { display: block; text-decoration: none; transition: border-color .15s; }
.drill-card:hover { border-color: var(--accent); }
.drill-card h2, .drill-card h3 { margin: 0 0 6px; }
.drill-card.accent { border-color: var(--warm); }
.stat { display: flex; flex-direction: column; gap: 2px; text-decoration: none; }
.stat .k { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); font-weight: 700; }
.stat .n { font-size: 28px; font-weight: 800; }
.table { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.table th, .table td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table th { font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.table tr:last-child td { border-bottom: 0; }
.table tr.open td { background: var(--bg); }
.avatar { border-radius: 50%; object-fit: cover; }

/* ── Front page ── */
.hero { padding: 28px 0 12px; max-width: 760px; }
.lead { font-size: 19px; color: var(--muted); max-width: 640px; }
.band { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 6px 24px 14px; margin: 34px 0; }
.points { padding-left: 20px; }
.points li { margin: 0 0 10px; }
.cta { text-align: center; padding: 18px 0; }
.cta .waitlist { justify-content: center; }
.waitlist { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin: 18px 0 10px; }
.waitlist input[type=email] { flex: 1 1 240px; max-width: 340px; }
.waitlist .error { flex-basis: 100%; margin: 0; }

/* ── Drills ── */
.levels { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0 6px; }
.level { display: flex; flex-direction: column; align-items: flex-start; gap: 0; font: inherit; text-align: left; padding: 8px 14px; border-radius: 10px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); cursor: pointer; }
.level span { font-size: 12px; color: var(--muted); }
.level.on { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.stage { min-height: 200px; }
.choices { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 8px; margin: 12px 0; }
.choice { display: flex; align-items: center; gap: 8px; font: inherit; text-align: left; padding: 11px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); cursor: pointer; }
.choice:hover:not(:disabled) { border-color: var(--accent); }
.choice kbd { opacity: .6; }
.choice.right { background: var(--good-bg); border-color: var(--good); color: var(--good); font-weight: 700; }
.choice.wrong { background: var(--bad-bg); border-color: var(--bad); color: var(--bad); }
.choice:disabled { cursor: default; }
.feedback { margin-top: 10px; }

/* Rhythm */
.writer { margin: 12px 0; }
.staff { overflow-x: auto; padding: 6px 0; color: var(--ink); }
svg.rhythm { display: block; max-width: none; }
svg.rhythm .slot { fill: none; stroke: var(--line); stroke-dasharray: 3 3; }
svg.rhythm .mark { fill: transparent; }
svg.rhythm .cell.right .mark { fill: var(--good-bg); }
svg.rhythm .cell.wrong .mark { fill: var(--bad-bg); }
svg.rhythm .cell.wrong { color: var(--bad); }
.palette { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 8px; }
.cell-btn { border: 1px solid var(--line); background: var(--bg); color: var(--ink); border-radius: 9px; padding: 0 4px; cursor: pointer; }
.cell-btn:hover:not(:disabled) { border-color: var(--accent); }
.cell-btn:disabled { opacity: .3; cursor: not-allowed; }
.palette-tools { display: inline-flex; gap: 6px; margin-left: auto; }

/* Melody */
.slots { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; margin: 8px 0 14px; }
.slots li { min-width: 54px; padding: 8px 6px; text-align: center; border: 1px solid var(--line); border-radius: 9px; font-weight: 650; background: var(--bg); }
.slots li.given { color: var(--muted); border-style: dashed; }
.slots li.current { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.slots li.right { background: var(--good-bg); border-color: var(--good); }
.slots li.wrong { background: var(--bad-bg); border-color: var(--bad); }
.slots .was { display: block; font-size: 12px; font-weight: 500; color: var(--muted); }
.keyboard { overflow-x: auto; padding-bottom: 6px; }
.keys { position: relative; display: flex; height: 150px; user-select: none; touch-action: manipulation; }
.key { position: relative; border: 1px solid #8b8b8b; cursor: pointer; padding: 0; font: inherit; }
.key.white { width: 40px; flex: 0 0 40px; height: 150px; background: #fdfdfb; color: #444; border-radius: 0 0 6px 6px; display: flex; align-items: flex-end; justify-content: center; padding-bottom: 6px; font-size: 11px; }
.key.black { width: 26px; flex: 0 0 26px; height: 92px; margin: 0 -13px; z-index: 1; background: #222; border-color: #111; border-radius: 0 0 4px 4px; }
.key:active, .key.white:active { filter: brightness(.85); }
.key:disabled { cursor: not-allowed; opacity: .7; }

/* Mock exam */
.exam-head { display: flex; justify-content: space-between; font-weight: 650; }
.clock { font-variant-numeric: tabular-nums; color: var(--muted); }
progress { width: 100%; height: 6px; margin: 8px 0 4px; accent-color: var(--accent); }
.review li { margin: 8px 0; }
.review li.right strong { color: var(--good); }
.review li.wrong strong { color: var(--bad); }
.review svg { margin: 4px 0; }

/* Progress */
.days { display: flex; gap: 3px; align-items: flex-end; height: 64px; margin: 6px 0 4px; }
.days span { flex: 1; min-width: 4px; max-width: 22px; height: calc(4px + var(--v, 0) * 58px); background: var(--line); border-radius: 3px; }
.days span.on { background: var(--warm); }
.weak { padding-left: 18px; }
.weak li { margin: 4px 0; }

/* Teacher */
.teacher-grid { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 18px; align-items: start; }
@media (max-width: 860px) { .teacher-grid { grid-template-columns: 1fr; } }
.class { overflow-x: auto; }
.class .table { border: 0; }
.class-head { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.class-head h2 { margin: 0 auto 0 0; }
.code { font: 700 18px ui-monospace, monospace; letter-spacing: .08em; padding: 4px 10px; border: 1px dashed var(--warm); border-radius: 8px; }
.plan p { margin: 0 0 8px; }

@media (max-width: 640px) {
  .site-header { gap: 10px; }
  .site-header nav { order: 3; width: 100%; gap: 14px; overflow-x: auto; }
  main { padding: 20px 14px 48px; }
}