:root {
  --bg: #f7f4ee;
  --surface: #ffffff;
  --surface-2: #f1ede5;
  --text: #1d1b26;
  --muted: #5f5c6b;
  --border: #e4dfd5;
  --primary: #2b3080;
  --primary-ink: #ffffff;
  --accent: #f2a541;
  --singing: #a23b8f;
  --tabla: #b04a12;
  --guitar: #0d7375;
  --voice: #1f63b5;
  --studio: #5a3fb8;
  --good: #23874f;
  --warn: #b7791f;
  --bad: #c43c3c;
  --radius: 16px;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.05), 0 4px 16px rgb(0 0 0 / 0.05);
  --course: var(--primary);
  --on-course: #ffffff;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14131a;
    --surface: #1e1d27;
    --surface-2: #272533;
    --text: #eeeaf4;
    --muted: #a5a1b4;
    --border: #34313f;
    --primary: #8f95ff;
    --primary-ink: #14131a;
    --singing: #e07ccd;
    --tabla: #f08a4b;
    --guitar: #3cc2c4;
    --voice: #7fb0ff;
    --studio: #b4a3ff;
    --good: #4cc584;
    --warn: #e0a84a;
    --bad: #ee6b6b;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3);
    --on-course: #14131a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Bengali", "Noto Sans Devanagari", "Nirmala UI", "Kohinoor Bangla", "Kohinoor Devanagari", sans-serif;
  padding-bottom: calc(76px + env(safe-area-inset-bottom));
}

a { color: var(--primary); }
h1 { font-size: 1.7rem; line-height: 1.2; margin: 0.3em 0 0.4em; }
h2 { font-size: 1.25rem; }
h3, .step-card h2, .step-block > h2, .exercise-head h2 { font-size: 1.08rem; margin: 0 0 0.6em; }
.celebrate h2 { font-size: 1.4rem; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
[hidden] { display: none !important; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.c-singing { --course: var(--singing); }
.c-tabla { --course: var(--tabla); }
.c-guitar { --course: var(--guitar); }
.c-voice { --course: var(--voice); }
.c-studio { --course: var(--studio); }

/* ---------- layout ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center;
  padding: 10px 16px;
  padding-top: calc(10px + env(safe-area-inset-top));
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.brand img { border-radius: 8px; }
.lang-switch { margin-left: auto; display: flex; gap: 4px; }
.lang-btn {
  min-width: 40px; min-height: 34px; padding: 4px 8px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font: inherit; font-size: 0.8rem; font-weight: 700; cursor: pointer;
}
.lang-btn.on { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.tabbar a b { font-weight: 600; }
.lang-dialog { position: fixed; inset: 0; z-index: 30; display: grid; place-items: center; padding: 16px; background: rgb(0 0 0 / 0.45); }
.lang-card { width: min(380px, 100%); padding: 24px; border-radius: var(--radius); background: var(--surface); text-align: center; box-shadow: var(--shadow); }
.lang-card h1 { font-size: 1.4rem; margin: 8px 0 4px; }
.lang-card p { margin: 2px 0; color: var(--muted); }
.lang-choices { display: grid; gap: 10px; margin-top: 18px; }
.lang-choices .btn { font-size: 1.1rem; min-height: 50px; }

main { outline: none; }
.container { max-width: 760px; margin: 0 auto; padding: 16px; }

.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 10;
  display: flex; justify-content: center;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom);
}
.tabbar a {
  flex: 1; max-width: 200px;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 8px 0 10px;
  color: var(--muted); text-decoration: none; font-size: 0.78rem; font-weight: 600;
}
.tabbar a span { font-size: 1.35rem; line-height: 1; }
.tabbar a.active { color: var(--primary); }

.back { display: inline-block; margin-bottom: 4px; text-decoration: none; font-weight: 600; font-size: 0.95rem; }
.section-title { margin: 1.4em 0 0.6em; }
.empty { text-align: center; padding-top: 48px; }

/* ---------- buttons & inputs ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 42px; padding: 8px 16px;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--surface); color: var(--text);
  font: inherit; font-weight: 600; font-size: 0.95rem;
  cursor: pointer; text-decoration: none;
  transition: transform 0.08s, background 0.15s;
  touch-action: manipulation;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary { background: var(--course); border-color: var(--course); color: var(--on-course); }
.btn-primary.active { background: var(--text); border-color: var(--text); color: var(--bg); }
.btn-ghost { background: transparent; }
.btn-danger { color: var(--bad); border-color: var(--bad); background: transparent; }
.btn-sm { min-height: 34px; padding: 4px 12px; font-size: 0.85rem; }
.btn-icon { width: 42px; padding: 0; font-size: 1.2rem; }
.btn.active:not(.btn-primary) { background: var(--surface-2); border-color: var(--course); }

.select {
  min-height: 42px; padding: 6px 12px;
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--surface); color: var(--text); font: inherit;
}

.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 12px; }
.controls.center { justify-content: center; }
.inline { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 6px; font-weight: 600; max-width: 100%; }
.select { max-width: 100%; }

.check { display: inline-flex; align-items: center; gap: 6px; font-size: 0.9rem; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--course); }

.tempo { display: flex; align-items: center; gap: 8px; margin-top: 12px; }
.tempo input { flex: 1; min-width: 0; accent-color: var(--course); }
.tempo-value { min-width: 72px; text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; font-size: 0.9rem; }

.slider { display: flex; align-items: center; gap: 10px; margin-top: 12px; font-size: 0.9rem; }
.slider input { flex: 1; accent-color: var(--course); }

.segmented { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.seg, .chip {
  min-height: 36px; padding: 6px 14px;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--surface); color: var(--text);
  font: inherit; font-size: 0.88rem; font-weight: 600; cursor: pointer;
}
.seg.on, .chip.on { background: var(--course); border-color: var(--course); color: var(--on-course); }
.chip.locked { outline: 2px dashed var(--course); outline-offset: 2px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0; }

.badge {
  display: inline-block; padding: 4px 10px; border-radius: 999px;
  background: var(--surface-2); font-size: 0.82rem; font-weight: 600;
}
.pill { display: inline-block; padding: 3px 10px; border-radius: 999px; background: color-mix(in srgb, var(--course) 10%, transparent); color: color-mix(in srgb, var(--course) 75%, var(--text)); font-weight: 700; font-size: 0.8rem; }

.bar { height: 8px; border-radius: 99px; background: var(--surface-2); overflow: hidden; flex: 1; }
.bar-fill { height: 100%; width: 0; background: var(--course); border-radius: 99px; transition: width 0.25s; }

/* ---------- home ---------- */
.hero {
  padding: 22px 20px; margin-top: 4px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #2b3080, #6a2c8a 60%, #c8571b);
  color: #fff;
}
.hero h1 { margin-top: 0; }
.hero p { margin: 0 0 16px; opacity: 0.92; }
.hero .stat { background: rgb(255 255 255 / 0.14); border: none; color: #fff; }
.hero .stat span { color: rgb(255 255 255 / 0.85); }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.stat {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  padding: 10px 6px; border-radius: 12px;
  background: var(--surface); border: 1px solid var(--border);
}
.stat b { font-size: 1.3rem; }
.stat span { font-size: 0.78rem; color: var(--muted); }

.resume {
  display: flex; align-items: center; gap: 12px;
  margin-top: 14px; padding: 14px 16px;
  border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border);
  box-shadow: var(--shadow); color: var(--text); text-decoration: none;
}
.resume-icon { font-size: 1.8rem; }
.goal { height: 8px; margin-top: 14px; border-radius: 99px; background: rgb(255 255 255 / 0.2); overflow: hidden; }
.goal-fill { height: 100%; border-radius: 99px; background: var(--accent); transition: width 0.4s; }
.goal-text { margin: 8px 0 0 !important; font-size: 0.88rem; }
.plan-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.plan-list .resume { margin-top: 0; }
.resume-title { font-weight: 700; }
.resume-go { margin-left: auto; width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; background: var(--primary); color: var(--primary-ink); }

.course-list { display: grid; gap: 12px; }
.course-card {
  display: flex; gap: 14px; padding: 16px;
  border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border);
  border-left: 6px solid var(--course);
  box-shadow: var(--shadow); color: var(--text); text-decoration: none;
}
.course-card h3 { margin: 0; font-size: 1.2rem; }
.course-card p { margin: 2px 0 10px; font-size: 0.9rem; }
.course-body { flex: 1; min-width: 0; }
.course-icon { font-size: 2.2rem; line-height: 1; width: 52px; height: 52px; display: grid; place-items: center; border-radius: 14px; background: color-mix(in srgb, var(--course) 14%, transparent); flex-shrink: 0; }
.course-icon.big { width: 72px; height: 72px; font-size: 2.8rem; }
.course-meta { display: flex; justify-content: space-between; margin-top: 6px; font-size: 0.85rem; color: var(--muted); }
.course-meta .link { color: var(--course); font-weight: 700; }

.tip {
  display: flex; gap: 10px; margin: 16px 0 0; padding: 12px 14px;
  border-radius: 12px; background: color-mix(in srgb, var(--accent) 16%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}
.tip .prose p:first-child { margin-top: 0; }
.tip .prose p:last-child { margin-bottom: 0; }
.tip-icon { font-size: 1.2rem; }

/* ---------- course ---------- */
.course-header { display: flex; gap: 16px; align-items: center; margin: 8px 0 4px; }
.course-header h1 { margin: 0; }
.course-header p { margin: 2px 0 8px; }
.course-header > div:last-child { flex: 1; min-width: 0; }

.lesson-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.lesson-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px; border-radius: 12px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); text-decoration: none;
}
.lesson-num {
  width: 32px; height: 32px; flex-shrink: 0; display: grid; place-items: center;
  border-radius: 50%; background: var(--surface-2); font-weight: 700; font-size: 0.9rem;
}
.lesson-title { flex: 1; font-weight: 600; }
.lesson-min { font-size: 0.82rem; white-space: nowrap; }
.lesson-item.done .lesson-num { background: var(--good); color: var(--on-course); }
.lesson-item.next { border-color: var(--course); box-shadow: 0 0 0 2px color-mix(in srgb, var(--course) 30%, transparent); }
.lesson-item.next .lesson-num { background: var(--course); color: var(--on-course); }
.lesson-item.locked { background: var(--surface-2); color: var(--muted); }
.lesson-item.locked .lesson-num { background: var(--surface); }

/* ---------- lesson ---------- */
.lesson-header h1 { margin: 8px 0; }
.lesson-progress { display: flex; align-items: center; gap: 10px; }
.step-card {
  margin-top: 16px; padding: 18px;
  border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.step-block + .step-block { margin-top: 24px; }
.step-label { color: var(--muted); margin: -4px 0 12px; }
.step-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 16px; }
.step-nav .btn { flex: 1; max-width: 240px; }

.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: 0.35em 0; }
.prose p:first-child { margin-top: 0; }
.big-line { font-size: 1.3rem; font-weight: 700; letter-spacing: 0.02em; text-align: center; }

.celebrate { text-align: center; padding: 16px 0; }
.celebrate-icon { font-size: 3.5rem; animation: pop 0.5s ease-out; }
@keyframes pop { from { transform: scale(0.3); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* ---------- quiz ---------- */
.quiz-q { padding: 12px 0; border-top: 1px solid var(--border); }
.quiz-text { font-weight: 600; margin: 0 0 8px; }
.quiz-options { display: grid; gap: 8px; }
.quiz-option {
  text-align: left; padding: 12px 14px; min-height: 46px;
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--surface-2); color: var(--text); font: inherit; cursor: pointer;
}
.quiz-option.correct { background: color-mix(in srgb, var(--good) 20%, var(--surface)); border-color: var(--good); }
.quiz-option.wrong { background: color-mix(in srgb, var(--bad) 14%, var(--surface)); border-color: var(--bad); text-decoration: line-through; }
.quiz-option:disabled { cursor: default; color: var(--text); }
.quiz-feedback { margin: 8px 0 0; font-size: 0.92rem; min-height: 1.2em; }
.quiz-feedback.good, .tuner-status.good { color: var(--good); }
.quiz-feedback.bad, .tuner-status.bad { color: var(--bad); }
.tuner-status.warn { color: var(--warn); }

/* ---------- widgets ---------- */
.widget { display: block; }

.dots { display: flex; gap: 12px; justify-content: center; padding: 10px 0; flex-wrap: wrap; }
.dot { width: 22px; height: 22px; border-radius: 50%; background: var(--surface-2); border: 2px solid var(--border); transition: background 0.05s; }
.dot.accent { border-color: var(--course); }
.dot.on { background: var(--course); border-color: var(--course); }

.timer-row { display: flex; align-items: center; gap: 14px; }
.timer-display { font-size: 2rem; font-weight: 800; font-variant-numeric: tabular-nums; min-width: 96px; }
.tasks { display: grid; gap: 6px; margin-top: 12px; }
.task { display: flex; gap: 10px; align-items: flex-start; padding: 8px 10px; border-radius: 10px; background: var(--surface-2); cursor: pointer; }
.task input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--course); flex-shrink: 0; }
.task input:checked + span { text-decoration: line-through; color: var(--muted); }

/* tabla */
.bol-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.bol-card { padding: 14px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--border); display: flex; flex-direction: column; gap: 6px; }
.bol-card.flash { animation: flash 0.35s; }
.bol-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.bol-name { font-size: 1.6rem; font-weight: 800; color: var(--course); }
.bol-hand { font-size: 0.75rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: 0.03em; text-align: right; }
.bol-how { margin: 0 0 6px; font-size: 0.92rem; flex: 1; }
.bol-card .btn { align-self: flex-start; }
@keyframes flash { 0% { box-shadow: 0 0 0 0 var(--course); } 100% { box-shadow: 0 0 0 10px transparent; } }

.strokes { display: flex; flex-wrap: wrap; gap: 8px; }
.stroke-group { display: flex; flex-wrap: wrap; max-width: 100%; gap: 4px; padding: 4px; border-radius: 10px; background: var(--surface-2); }
.stroke {
  min-width: 42px; padding: 8px 6px; text-align: center;
  border-radius: 8px; background: var(--surface); font-weight: 700;
  transition: background 0.05s, color 0.05s;
}
.stroke.rest { color: var(--muted); }
.stroke.on { background: var(--course); color: var(--on-course); }

.taal-grid { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.vibhag { padding: 6px; border-radius: 12px; background: var(--surface-2); }
.vibhag.khali { background: color-mix(in srgb, var(--course) 8%, var(--surface-2)); border: 1px dashed color-mix(in srgb, var(--course) 50%, transparent); }
.vibhag-mark { display: block; font-weight: 800; color: var(--course); padding: 0 4px 4px; }
.vibhag-beats { display: flex; gap: 4px; }
.beat {
  position: relative;
  display: flex; flex-direction: column; align-items: center;
  min-width: 52px; padding: 6px 4px; border-radius: 8px; background: var(--surface);
  transition: background 0.05s, color 0.05s;
}
.beat-num { font-size: 0.72rem; color: var(--muted); }
.beat-bol { font-weight: 700; font-size: 0.95rem; }
.beat-hand { position: absolute; top: -10px; right: -4px; font-size: 0.85rem; }
.beat.on { background: var(--course); color: var(--on-course); }
.beat.on .beat-num { color: inherit; opacity: 0.8; }

/* guitar */
.chord-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 12px; }
.chord-card { padding: 12px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--border); text-align: center; }
.chord-name { font-size: 1.5rem; font-weight: 800; color: var(--course); }
.chord-name small { display: block; font-size: 0.8rem; color: var(--muted); font-weight: 600; }
.chord-actions { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.chord-tip { font-size: 0.85rem; text-align: left; margin: 10px 0 0; }
.chord-svg { width: 150px; max-width: 100%; height: auto; display: block; margin: 4px auto; }
.chord-svg .fret { stroke: var(--muted); stroke-width: 1.2; }
.chord-svg .nut { stroke: var(--text); stroke-width: 5; }
.chord-svg .string { stroke: var(--text); stroke-width: 1.3; }
.chord-svg .dot, .chord-svg .barre { fill: var(--course); }
.chord-svg .finger { fill: var(--on-course); font-size: 10px; font-weight: 700; }
.chord-svg .open { fill: none; stroke: var(--text); stroke-width: 1.5; }
.chord-svg .marker { fill: var(--bad); font-size: 14px; font-weight: 700; }
.chord-svg .sname, .chord-svg .basefret { fill: var(--muted); font-size: 10px; font-weight: 600; }

.string-buttons { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; margin-bottom: 10px; }
.string-btn { flex-direction: column; border-radius: 12px; min-height: 60px; gap: 0; }
.string-btn b { color: var(--course); }
.string-btn small { color: var(--muted); font-weight: 500; font-size: 0.75rem; }

.strum-layout { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.mini-diagram .chord-svg { width: 120px; margin: 0; }
.pattern { display: flex; gap: 4px; flex-wrap: wrap; flex: 1 1 316px; min-width: 0; }
.slot {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  width: 36px; padding: 6px 0; border-radius: 8px; background: var(--surface-2);
  transition: background 0.05s, color 0.05s;
}
.slot-count { font-size: 0.72rem; color: var(--muted); font-weight: 700; }
.slot-arrow { font-size: 1.3rem; font-weight: 800; line-height: 1; }
.slot.miss .slot-arrow { color: var(--muted); }
.slot.on { background: var(--course); color: var(--on-course); }
.slot.on .slot-count { color: inherit; opacity: 0.8; }

.tab-view { display: flex; border-radius: 10px; background: var(--surface-2); padding: 8px; font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
.tab-scroll { display: flex; overflow-x: auto; position: relative; scroll-behavior: smooth; }
.tab-col { display: flex; flex-direction: column; border-radius: 6px; }
.tab-cell {
  width: 30px; height: 24px; display: grid; place-items: center; font-weight: 700; font-size: 0.9rem;
  background: linear-gradient(var(--muted), var(--muted)) center / 100% 1px no-repeat;
}
.tab-cell.has { background: radial-gradient(circle, var(--surface) 0 10px, transparent 11px), linear-gradient(var(--muted), var(--muted)) center / 100% 1px no-repeat; }
.tab-labels .tab-cell { background: none; color: var(--muted); width: 18px; }
.tab-col.on { background: color-mix(in srgb, var(--course) 30%, transparent); }

.tuner { text-align: center; }
.gauge { position: relative; height: 112px; overflow: hidden; margin: 0 auto 8px; max-width: 240px; }
.gauge::before {
  content: ""; position: absolute; left: 50%; bottom: -110px; width: 220px; height: 220px; transform: translateX(-50%);
  border-radius: 50%; border: 10px solid var(--surface-2);
}
.gauge::after { content: ""; position: absolute; left: calc(50% - 3px); top: 0; width: 6px; height: 14px; border-radius: 3px; background: var(--good); }
.gauge-scale { position: absolute; inset: 22px 18px auto; display: flex; justify-content: space-between; color: var(--muted); font-weight: 700; font-size: 0.85rem; }
.gauge-scale span:nth-child(2) { visibility: hidden; }
.needle {
  position: absolute; left: calc(50% - 2px); bottom: 0; width: 4px; height: 100px;
  background: var(--course); border-radius: 4px; transform-origin: 50% 100%;
  transition: transform 0.12s ease-out;
}
.tuner-note { font-size: 3rem; font-weight: 800; line-height: 1.1; transition: opacity 0.3s; }
.tuner-note.dim { opacity: 0.5; }
.tuner-status { font-weight: 700; min-height: 1.5em; margin: 6px 0; }
.tuner .chips { justify-content: center; }
.tuner .controls { justify-content: center; }

/* voice */
.drone-head { display: flex; align-items: center; gap: 12px; }
.drone-icon { font-size: 2rem; }

.swara { position: relative; display: inline-block; font-weight: 700; }
.swara.komal { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 3px; }
.swara.tivra::before { content: ""; position: absolute; left: 50%; top: -6px; width: 2px; height: 6px; background: currentColor; }
.swara.taar::after, .swara.mandra::after { content: ""; position: absolute; left: calc(50% - 2px); width: 4px; height: 4px; border-radius: 50%; background: currentColor; }
.swara.taar::after { top: -5px; }
.swara.mandra::after { bottom: -4px; }
.swara.taar.tivra::before { left: calc(50% + 6px); }

.swara-keys { display: grid; grid-template-columns: repeat(auto-fill, minmax(64px, 1fr)); gap: 8px; }
.swara-key {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  min-height: 84px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-size: 1.1rem; cursor: pointer;
  box-shadow: inset 0 -4px 0 var(--surface-2);
}
.swara-key.alt { background: var(--surface-2); }
.swara-key small { font-size: 0.72rem; color: var(--muted); }
.swara-key.flash { animation: flash 0.35s; }

.notes { display: flex; flex-wrap: wrap; gap: 8px; }
.note-group { display: flex; flex-wrap: wrap; gap: 4px; padding: 4px; border-radius: 10px; background: var(--surface-2); }
.note-chip {
  min-width: 42px; padding: 10px 6px 8px; text-align: center;
  border-radius: 8px; background: var(--surface);
  transition: background 0.05s, color 0.05s;
}
.note-chip.hold { color: var(--muted); }
.note-chip.on { background: var(--course); color: var(--on-course); }
.note-chip.done { background: color-mix(in srgb, var(--good) 25%, var(--surface)); }

.bar.hold { max-width: 420px; margin: 8px auto; }

.breath { text-align: center; }
.breath .controls { justify-content: center; }
.breath-stage { position: relative; width: 220px; height: 220px; margin: 0 auto; display: grid; place-items: center; }
.breath-circle {
  position: absolute; inset: 0; border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--course) 55%, transparent), color-mix(in srgb, var(--course) 15%, transparent));
  transform: scale(0.45); transition: transform 0.6s ease-in-out;
}
.breath-text { position: relative; }
.breath-label { font-weight: 700; font-size: 1.1rem; }
.breath-count { font-size: 2.2rem; font-weight: 800; }

/* theory / practical modes */
.mode-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px; margin: 4px 0 12px; border-radius: 14px; background: var(--surface-2); }
.mode-tabs a {
  display: flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 42px; border-radius: 10px; font-weight: 700; text-decoration: none; color: var(--muted);
}
.mode-tabs a.on { background: var(--surface); color: var(--course); box-shadow: var(--shadow); }
.tick { display: inline-grid; place-items: center; width: 18px; height: 18px; border-radius: 50%; background: var(--good); color: #fff; font-size: 0.7rem; }

.mode-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 14px; }
.mode-card {
  display: flex; flex-direction: column; gap: 4px; padding: 14px;
  border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border);
  box-shadow: var(--shadow); color: var(--text); text-decoration: none;
}
.mode-card b { font-size: 1.1rem; }
.mode-icon { font-size: 1.7rem; }

.lesson-row { display: flex; gap: 8px; align-items: stretch; }
.lesson-row > .lesson-item { flex: 1; min-width: 0; }
.practice-link {
  display: grid; place-items: center; min-width: 56px; padding: 0 8px;
  border-radius: 12px; border: 1px solid var(--border); background: var(--surface);
  text-decoration: none; font-size: 1.1rem; white-space: nowrap; color: var(--text);
}
.practice-link.done { border-color: var(--good); background: color-mix(in srgb, var(--good) 14%, var(--surface)); font-size: 0.95rem; }
.practice-list .lesson-title small { font-weight: 500; }

.exercise-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; flex-wrap: wrap; }
.exercise-head h2 { margin: 0 0 8px; }
.badge.pass { background: color-mix(in srgb, var(--good) 20%, var(--surface)); color: var(--good); }
.badge.fail { background: color-mix(in srgb, var(--warn) 20%, var(--surface)); color: var(--warn); }

.exercise .notes { margin-bottom: 10px; }
.ex-status { font-weight: 700; min-height: 1.5em; margin: 10px 0 4px; }
.ex-status.good { color: var(--good); }
.ex-status.warn { color: var(--warn); }
.ex-status.bad { color: var(--bad); }
.ex-result { margin-top: 14px; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); }
.ex-result.pass { background: color-mix(in srgb, var(--good) 12%, var(--surface)); border-color: var(--good); }
.ex-result.fail { background: color-mix(in srgb, var(--warn) 12%, var(--surface)); border-color: var(--warn); }
.ex-result p { margin: 6px 0 0; font-size: 0.92rem; }
.ex-score { font-size: 1.15rem; font-weight: 800; }

.note-chip { display: inline-flex; flex-direction: column; align-items: center; }
.chip-note { font-size: 0.68rem; font-weight: 700; line-height: 1.2; min-height: 0.9em; }
.note-chip.ok { background: color-mix(in srgb, var(--good) 25%, var(--surface)); }
.note-chip.ok .chip-note { color: var(--good); }
.note-chip.bad { background: color-mix(in srgb, var(--bad) 18%, var(--surface)); }
.note-chip.bad .chip-note { color: var(--bad); }
.note-chip.on .chip-note { color: inherit; }

.live-voice { display: flex; align-items: baseline; gap: 6px; min-height: 1.8em; transition: opacity 0.2s; }
.live-voice.dim .live-swara, .live-voice.dim .live-swara + span { opacity: 0.5; }
.live-swara { font-size: 1.3rem; }
.range-readout { font-size: 1.05rem; }
.grow { flex: 1; min-width: 200px; }
.change-current { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 8px 0; }
.change-name { font-size: 2.2rem; font-weight: 800; color: var(--course); line-height: 1; }
.rhythm-head { display: flex; align-items: flex-start; gap: 12px; }
.rhythm-head .notes { flex: 1; }
.count-in { min-width: 54px; font-size: 2.4rem; font-weight: 800; color: var(--course); text-align: center; line-height: 1.2; }

.progress-bars { flex: 1; display: grid; gap: 4px; }
.progress-line { display: flex; align-items: center; gap: 8px; }

.level-bar { height: 12px; margin: 4px 0 8px; }
.bar-fill.level { transition: width 0.08s; background: var(--good); }
.mic-details summary { cursor: pointer; font-weight: 700; list-style-position: inside; }
.mic-details[open] summary { margin-bottom: 8px; }

.ear-options { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); margin-top: 12px; }
.ear-option { text-align: center; font-weight: 700; font-size: 1.05rem; }

/* tools */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
.tool-card {
  display: flex; flex-direction: column; gap: 4px; padding: 16px;
  border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border);
  box-shadow: var(--shadow); color: var(--text); text-decoration: none;
}
.tool-icon { font-size: 1.8rem; }

/* progress */
.week-chart { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; align-items: end; height: 170px; }
.week-day { display: flex; flex-direction: column; align-items: center; height: 100%; gap: 4px; }
.week-bar-wrap { flex: 1; width: 100%; max-width: 34px; display: flex; align-items: flex-end; background: var(--surface-2); border-radius: 8px; overflow: hidden; }
.week-bar { width: 100%; background: var(--primary); border-radius: 8px 8px 0 0; }
.week-value { font-size: 0.75rem; font-weight: 700; min-height: 1.1em; }
.week-label { font-size: 0.75rem; color: var(--muted); }
.progress-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; color: var(--text); text-decoration: none; }
.progress-name { width: 70px; font-weight: 600; }

#toast {
  position: fixed; left: 50%; bottom: calc(90px + env(safe-area-inset-bottom)); z-index: 20;
  transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  max-width: calc(100% - 32px); padding: 10px 18px; border-radius: 999px;
  background: var(--text); color: var(--bg); font-weight: 600; font-size: 0.92rem;
  transition: opacity 0.2s, transform 0.2s;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 480px) {
  h1 { font-size: 1.45rem; }
  .step-card { padding: 14px; }
  .beat { min-width: 44px; }
  .slot { width: 32px; }
  .course-icon { width: 44px; height: 44px; font-size: 1.8rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* sync map: where the playing is in sync with the music */
.sync-map { margin-top: 14px; padding-top: 10px; border-top: 1px solid var(--border); }
.sync-title { font-weight: 800; margin-bottom: 6px; }
.sync-scroll { overflow-x: auto; padding-bottom: 6px; }
.sync-track { position: relative; height: 96px; border-radius: 10px; background: var(--surface); border: 1px solid var(--border); }
.sync-slot {
  position: absolute; top: 0; bottom: 0; display: flex; flex-direction: column; align-items: center;
  justify-content: space-between; padding: 4px 0; box-sizing: border-box; font-size: 0.72rem; color: var(--muted);
}
.sync-slot.beat { border-left: 1px solid var(--border); }
.sync-slot.missed { background: color-mix(in srgb, var(--bad) 16%, transparent); }
.sync-want { width: 2px; flex: 1; margin: 2px 0; background: var(--border); }
.sync-mark { font-weight: 800; font-size: 0.85rem; }
.sync-slot.ok .sync-mark { color: var(--good); }
.sync-slot.early .sync-mark, .sync-slot.late .sync-mark, .sync-slot.sound .sync-mark { color: var(--warn); }
.sync-slot.missed .sync-mark { color: var(--bad); }
.sync-slot.missed .sync-want { background: var(--bad); }
.sync-dot { position: absolute; top: 50%; width: 14px; height: 14px; margin: -7px 0 0 -7px; border-radius: 50%; border: 2px solid var(--surface); background: var(--good); }
.sync-dot.early, .sync-dot.late, .sync-dot.sound { background: var(--warn); }
.sync-dot.extra { background: var(--bad); border-radius: 3px; transform: rotate(45deg); }
.sync-key { display: flex; flex-wrap: wrap; gap: 4px 14px; margin: 6px 0; }
.sync-list { margin: 6px 0 0; padding-left: 20px; font-size: 0.92rem; }
.sync-ok { font-weight: 700; color: var(--good); }
.sync-key-extra { display: inline-block; width: 8px; height: 8px; border-radius: 2px; background: var(--bad); transform: rotate(45deg); }
.sync-slot.missed .sync-label { color: var(--text); font-weight: 700; }

/* badges */
.badge-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.badge-tile {
  display: flex; flex-direction: column; align-items: center; gap: 2px; text-align: center;
  padding: 10px 8px; border-radius: 12px; border: 1px dashed var(--border); background: var(--surface-2); color: var(--muted);
}
.badge-tile b { color: var(--text); font-size: 0.92rem; }
.badge-tile.earned { border: 1px solid var(--good); background: color-mix(in srgb, var(--good) 12%, var(--surface)); }
.badge-icon { font-size: 1.8rem; line-height: 1.2; }
.badge-tile:not(.earned) .badge-icon { filter: grayscale(1); opacity: 0.45; }

/* lehra player */
.lehra-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(64px, 1fr)); gap: 6px; margin: 8px 0; }
.lehra-beat { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 6px 4px; border-radius: 10px; background: var(--surface-2); border-left: 3px solid transparent; }
.lehra-beat.vibhag-start { border-left-color: var(--course); }
.lehra-beat.khali { background: color-mix(in srgb, var(--course) 8%, var(--surface-2)); }
.lehra-beat.on { background: var(--course); color: var(--on-course); }
.lehra-beat.on .beat-num, .lehra-beat.on .muted { color: inherit; }
.lehra-notes { display: flex; gap: 4px; font-weight: 700; font-size: 1.05rem; }

/* sing-along studio */
.studio-banner {
  display: flex; align-items: center; gap: 12px; margin: 14px 0; padding: 14px 16px;
  border-radius: var(--radius); text-decoration: none; color: var(--on-course);
  background: linear-gradient(135deg, var(--course), color-mix(in srgb, var(--course) 70%, #000));
  box-shadow: var(--shadow);
}
.studio-banner > span:nth-child(2) { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.studio-banner b { font-size: 1.05rem; }
.studio-icon { font-size: 1.9rem; }
.song-list { list-style: none; margin: 12px 0; padding: 0; display: grid; gap: 10px; }
.song-card {
  display: flex; align-items: center; gap: 12px; padding: 14px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow); color: var(--text); text-decoration: none;
}
button.song-card { width: 100%; font: inherit; text-align: left; cursor: pointer; }
.song-icon { font-size: 1.8rem; }
.song-main { flex: 1; display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.song-best { font-weight: 800; color: var(--course); white-space: nowrap; }
.pitch-roll { display: block; width: 100%; height: 230px; border-radius: 12px; background: var(--surface); border: 1px solid var(--border); }
.roll-legend { display: flex; flex-wrap: wrap; gap: 4px 14px; margin: 6px 0; }
.roll-legend .dot { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 4px; vertical-align: -1px; }
.dot.target { background: color-mix(in srgb, var(--course) 50%, transparent); }
.dot.hit { background: var(--good); }
.dot.miss { background: var(--bad); }
.dot.you { background: var(--text); height: 3px; vertical-align: 2px; }
.lyrics { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.lyric-line {
  display: flex; gap: 10px; align-items: baseline; width: 100%; padding: 8px 10px; border-radius: 10px; cursor: pointer;
  border: 1px solid transparent; background: var(--surface-2); color: var(--text); font: inherit; text-align: left;
}
.lyric-line > span:last-child { display: flex; flex-direction: column; }
.lyric-line:focus-visible { outline: 2px solid var(--course); }
.lyric-line.current { border-color: var(--course); background: var(--surface); }
.lyric-line.looping { border: 2px dashed var(--course); }
.line-num { font-size: 0.8rem; color: var(--muted); min-width: 1.2em; }
.lyric-words { display: flex; flex-wrap: wrap; gap: 2px 6px; font-size: 1.15rem; font-weight: 600; }
.lyric-line.current .lyric-words { font-size: 1.35rem; }
.lyric-roman { display: block; font-size: 0.85rem; color: var(--muted); margin-top: 2px; }
.syl { border-radius: 6px; padding: 0 2px; transition: background 0.08s; }
.syl.now { background: var(--course); color: var(--on-course); }
.syl.hit { color: var(--good); }
.syl.miss { color: var(--bad); text-decoration: underline wavy; text-underline-offset: 4px; }
.syl.now.hit, .syl.now.miss { color: var(--on-course); }
.line-scores { list-style: none; margin: 10px 0; padding: 0; display: grid; gap: 6px; }
.line-scores li { display: grid; grid-template-columns: auto 1fr auto; gap: 8px; align-items: center; }
.line-scores li .btn { grid-column: 1 / -1; justify-self: start; }
.bar-fill.weak { background: var(--warn); }
.now-lyrics { margin: 10px 0 4px; padding: 10px 12px; border-radius: 12px; background: var(--surface-2); min-height: 3.4em; }
.now-words { display: flex; flex-wrap: wrap; gap: 2px 8px; font-size: 1.45rem; font-weight: 700; line-height: 1.5; }
.next-words { margin-top: 4px; color: var(--muted); font-size: 0.95rem; }

/* own track + my songs */
.own-track { margin: 12px 0; border-color: var(--course); }
.privacy-note { padding: 8px 12px; border-radius: 10px; background: color-mix(in srgb, var(--good) 10%, var(--surface)); }
.input {
  width: 100%; min-height: 42px; padding: 8px 10px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit;
}
.input:focus-visible { outline: 2px solid var(--course); outline-offset: 1px; }
.notes-input { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 0.04em; }
.lyrics-paste { min-height: 140px; resize: vertical; font-size: 1.1rem; line-height: 1.6; }
.field { display: flex; flex-direction: column; gap: 4px; margin: 8px 0; }
.field input[type='range'] { width: 100%; accent-color: var(--course); }
.field-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 0 12px; }
.song-lines { list-style: none; margin: 10px 0; padding: 0; display: grid; gap: 10px; }
.song-line-edit { padding: 10px; border-radius: 12px; background: var(--surface-2); }
.line-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.line-head b { flex: 1; }
.swara-pad { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0; position: sticky; top: 0; z-index: 2; padding: 6px; border-radius: 12px; background: var(--surface); box-shadow: var(--shadow); }
.swara-pad .btn { min-width: 44px; }
.form-errors { margin: 12px 0; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--bad); background: color-mix(in srgb, var(--bad) 8%, var(--surface)); }
.form-errors ul { margin: 6px 0 0; padding-left: 20px; }
.sticky-actions { position: sticky; bottom: 76px; padding: 10px 0; background: var(--bg); }
.seek { width: 100%; accent-color: var(--course); margin: 4px 0 8px; }
.yt-row { display: flex; gap: 8px; align-items: center; margin: 8px 0; }
.yt-row .input { flex: 1; min-width: 0; }
.yt-player:not(:empty) { position: relative; width: 100%; aspect-ratio: 16 / 9; margin: 8px 0; border-radius: 12px; overflow: hidden; background: #000; }
.yt-player iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.yt-help { margin: 8px 0; }
.yt-help summary { cursor: pointer; font-weight: 600; }

/* The singer's recording after a take: hear, mix and save. */
.take-panel { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--border); text-align: left; }
.take-panel h3 { margin: 0 0 4px; font-size: 1.05rem; }
.take-panel .field { display: grid; gap: 4px; margin: 8px 0; max-width: 420px; }
.take-panel .field input[type=range] { width: 100%; }
.take-panel .btn.active { background: var(--primary); color: var(--primary-ink); }

/* Download songs: backing tracks and free sources. */
.download-card h3 { margin: 16px 0 4px; font-size: 1.05rem; }
.download-card .field { display: grid; gap: 4px; max-width: 420px; margin: 8px 0; }
.source-list { padding-left: 1.2em; margin: 6px 0 10px; }
.source-list li { margin: 4px 0; }

/* Watch-demo panels in practical exercises. */
.demo { margin: 6px 0 12px; }
.btn.btn-demo.active:not(.btn-primary) { background: var(--course); color: var(--on-course); border-color: var(--course); }
.demo-stage { margin-top: 8px; padding: 12px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface-2); }
.demo-drums { position: relative; max-width: 420px; margin: 0 auto; }
.tabla-svg { display: block; width: 100%; height: auto; }
.tabla-svg .drum-rim { fill: #c9a46a; stroke: #7a5a2b; stroke-width: 2; transition: fill 0.12s; }
.tabla-svg [data-drum="bayan"] .drum-rim { fill: #9aa3ad; stroke: #5c6570; }
.tabla-svg .drum-skin { fill: #efe2c4; stroke: #b99a62; stroke-width: 1; transition: fill 0.12s; }
.tabla-svg .drum-syahi { fill: #2a2622; transition: fill 0.12s; }
.tabla-svg .lit.drum-rim, .tabla-svg .lit.drum-skin { fill: #ffd27a; }
.tabla-svg .lit.drum-syahi { fill: #6b4a1f; }
.tabla-svg .drum-label { font: 600 12px system-ui, sans-serif; text-anchor: middle; fill: var(--text); }
.tabla-svg .hit-mark { fill: rgb(255 255 255 / 0.85); stroke: var(--course); stroke-width: 3; transform-box: fill-box; transform-origin: center; animation: hit 0.6s ease-out forwards; }
@keyframes hit { 0% { transform: scale(0.4); opacity: 1; } 60% { transform: scale(1.15); opacity: 0.9; } 100% { transform: scale(1.5); opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .tabla-svg .hit-mark { animation: none; opacity: 0.9; } }
.demo-count { position: absolute; inset: 0; display: grid; place-items: center; font: 800 3rem system-ui, sans-serif; color: var(--course); pointer-events: none; text-shadow: 0 2px 8px rgb(0 0 0 / 0.2); }
.demo-count:empty { display: none; }
.demo-bols { margin: 8px 0; }
.demo-how { margin: 8px 0 0; min-height: 3em; }
.demo-how p { margin: 4px 0 0; }
.demo-roll { height: 280px; }
.teacher-videos { margin: 8px 0 12px; display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }

/* Staff notation. */
.staff-lines { display: flex; flex-direction: column; gap: 2px; overflow-x: auto; }
.staff-svg { display: block; max-width: 100%; height: auto; color: var(--text); }
.staff-svg .staff-line, .staff-svg .staff-bar { stroke: currentColor; stroke-width: 1; opacity: 0.75; }
.staff-svg .staff-clef { fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; }
.staff-svg .staff-clef-dot, .staff-svg .staff-dot { fill: currentColor; }
.staff-svg .staff-time { font: 800 19px Georgia, 'Times New Roman', serif; fill: currentColor; text-anchor: middle; }
.staff-svg .staff-acc { font: 600 17px system-ui, sans-serif; fill: currentColor; }
.staff-svg .staff-head { fill: currentColor; stroke: currentColor; stroke-width: 1.4; }
.staff-svg .staff-head.hollow { fill: var(--surface); }
.staff-svg .staff-stem { stroke: currentColor; stroke-width: 1.4; }
.staff-svg .staff-note.on { color: var(--course); }
.staff-svg .staff-note.on .staff-head { fill: var(--course); stroke: var(--course); }
.staff-svg .staff-note.on .staff-head.hollow { fill: var(--surface); }
.staff-names { display: flex; flex-wrap: wrap; gap: 4px; margin: 8px 0; }
.staff-names .note-chip.on { background: var(--course); color: var(--on-course); }
.clap-stage { font-size: 4.5rem; text-align: center; line-height: 1.4; }
.clap-stage.hit { animation: clap 0.25s ease-out; }
@keyframes clap { 0% { transform: scale(1); } 40% { transform: scale(1.25); } 100% { transform: scale(1); } }
@media (prefers-reduced-motion: reduce) { .clap-stage.hit { animation: none; } }

/* Music Studio. */
.studio-title { width: 100%; font-size: 1.25rem; font-weight: 700; margin: 6px 0 12px; }
.studio-panel { margin: 10px 0; }
.studio-panel .field { display: grid; gap: 4px; min-width: 0; }
.warn-text { color: var(--warn); }
.studio-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); }
.studio-grid { display: grid; min-width: max-content; }
.studio-grid .row-label {
  position: sticky; left: 0; z-index: 1; height: 1.8rem;
  display: flex; align-items: center; justify-content: flex-end; padding-right: 8px;
  background: var(--surface); border-right: 1px solid var(--border); border-bottom: 1px solid var(--surface-2);
  font-weight: 600; font-size: 0.9rem;
}
.studio-grid .row-label.sa { color: var(--course); background: var(--surface-2); }
.studio-grid .cell {
  height: 1.8rem; padding: 0; margin: 0; border: 0; border-radius: 0; cursor: pointer; background: var(--surface); font: inherit; min-width: 0;
  border-left: 1px solid var(--surface-2); border-bottom: 1px solid var(--surface-2);
}
.studio-grid .cell.beat { border-left-color: var(--border); }
.studio-grid .cell.bar { border-left: 2px solid var(--muted); }
.studio-grid .cell:hover { background: var(--surface-2); }
.studio-grid .cell.ghost { background: color-mix(in srgb, var(--course) 18%, var(--surface)); }
.studio-grid .cell.on { background: var(--course); border-left-color: transparent; }
.studio-grid .cell.on.start { border-top-left-radius: 7px; border-bottom-left-radius: 7px; }
.studio-grid .cell.on.end { border-top-right-radius: 7px; border-bottom-right-radius: 7px; }
.studio-grid .cell.drum.on { background: radial-gradient(circle, var(--tabla) 0 45%, transparent 48%); border-left: 1px solid var(--border); border-radius: 0; }
.studio-grid .cell.now { box-shadow: inset 0 0 0 999px rgb(242 165 65 / 0.28); }
.studio-grid .cell:disabled { cursor: default; opacity: 0.55; }
.studio-grid .cell:focus-visible { outline: 2px solid var(--primary); outline-offset: -2px; position: relative; z-index: 2; }
.studio-actions .controls { margin: 6px 0; }

/* AI teacher. */
.chat-log { display: grid; gap: 10px; margin: 12px 0; }
.chat-msg { max-width: 92%; padding: 10px 14px; border-radius: 16px; line-height: 1.5; overflow-wrap: anywhere; }
.chat-msg p { margin: 0 0 6px; }
.chat-msg p:last-child, .chat-msg ul:last-child, .chat-msg ol:last-child { margin-bottom: 0; }
.chat-msg ul, .chat-msg ol { margin: 4px 0 6px; padding-left: 1.3em; }
.chat-msg.me { justify-self: end; background: var(--course); color: var(--on-course, #fff); border-bottom-right-radius: 4px; white-space: pre-wrap; }
.chat-msg.guru { justify-self: start; background: var(--surface); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.chat-msg.thinking { color: var(--muted); font-style: italic; animation: pulse 1.4s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.45; } }
@media (prefers-reduced-motion: reduce) { .chat-msg.thinking { animation: none; } }
.chat-suggest { display: flex; flex-wrap: wrap; gap: 8px; }
.chat-suggest p { width: 100%; margin: 0; }
.chat-suggest .chip { text-align: left; white-space: normal; }
.chat-composer { display: grid; gap: 8px; }
.chat-input { width: 100%; resize: vertical; min-height: 4.5em; font: inherit; }
.ask-teacher { margin: 12px 0 0; }
.ask-teacher:empty { display: none; }