/* ════════════════════════════════════════════════════════════════════
   LOGIELTS SONGS — app.css · pink #EC4899 accent · mobile-first
   Base tokens come from ../theme.css (Space Grotesk, dark/light vars).
   Visual language mirrors listening/app.css (cards, buttons, gate).
   ════════════════════════════════════════════════════════════════════ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:'Space Grotesk',sans-serif;min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}
body::after{content:'';position:fixed;inset:0;background:radial-gradient(ellipse 600px 500px at -10% -10%,rgba(236,72,153,.08),transparent),radial-gradient(ellipse 500px 400px at 110% 110%,rgba(124,92,191,.06),transparent);pointer-events:none;z-index:0}
main{flex:1;position:relative;z-index:1}
.wrap{max-width:860px;margin:0 auto;padding:24px 18px 40px}

.page-title{font-size:1.65rem;font-weight:700;margin-bottom:4px;line-height:1.25}
.page-title em{color:#EC4899;font-style:normal}
.page-sub{color:var(--dim);font-size:.85rem;margin-bottom:22px;line-height:1.6}

.card{background:var(--surf);border:1px solid var(--border);border-radius:var(--r);padding:18px;margin-bottom:14px}
.card-label{font-size:.68rem;text-transform:uppercase;letter-spacing:1.3px;color:var(--dim);font-weight:700;margin-bottom:10px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;border-radius:11px;padding:11px 18px;font-family:'Space Grotesk',sans-serif;font-size:.86rem;font-weight:700;cursor:pointer;transition:all .18s;border:none;min-height:42px}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn-teal{background:linear-gradient(135deg,#EC4899,#BE185D);color:#fff}
.btn-teal:hover:not(:disabled){opacity:.9;transform:translateY(-1px)}
.btn-ghost{background:var(--surf2);border:1px solid var(--border);color:var(--dim)}
.btn-ghost:hover:not(:disabled){border-color:#EC4899;color:var(--text)}
.btn-block{width:100%}

/* gate */
.gate-panel{max-width:430px;margin:70px auto;text-align:center;background:var(--surf);border:1px solid var(--border);border-radius:var(--r);padding:34px 26px}
.gate-ic{font-size:2.6rem;margin-bottom:12px}
.gate-title{font-size:1.15rem;font-weight:700;margin-bottom:8px}
.gate-msg{font-size:.86rem;color:var(--dim);line-height:1.6;margin-bottom:18px}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--surf3);border:1px solid var(--border2);color:var(--text);border-radius:12px;padding:11px 18px;font-size:.83rem;z-index:9500;box-shadow:var(--shadow);max-width:90vw}
.dim-note{font-size:.78rem;color:var(--dim);line-height:1.6}
.err-note{background:rgba(239,68,68,.08);border:1px solid rgba(239,68,68,.22);border-radius:var(--r2);padding:11px 14px;font-size:.81rem;color:var(--red);margin-top:10px}
[data-theme="light"] .err-note{color:#b91c1c}
.spin{width:16px;height:16px;border:2px solid var(--border);border-top-color:#EC4899;border-radius:50%;animation:sgspin .7s linear infinite;display:inline-block;vertical-align:-3px}
@keyframes sgspin{to{transform:rotate(360deg)}}

/* ── difficulty chooser (picker) ── */
.diff-picker{background:var(--surf);border:1px solid var(--border);border-radius:var(--r);padding:13px 16px;margin-bottom:16px}
.diff-picker-label{font-size:.68rem;text-transform:uppercase;letter-spacing:1.3px;color:var(--dim);font-weight:700;margin-bottom:9px}
.diff-picker-chips{display:flex;gap:7px;flex-wrap:wrap}
.diff-chip{background:var(--surf2);border:1px solid var(--border);border-radius:20px;padding:6px 16px;font-size:.8rem;font-weight:800;color:var(--dim);cursor:pointer;font-family:'Space Grotesk',sans-serif;transition:all .15s}
.diff-chip:hover{border-color:#EC4899;color:var(--text)}
.diff-chip.on{background:#EC4899;border-color:#EC4899;color:#fff;box-shadow:0 2px 12px rgba(236,72,153,.4)}
.diff-picker-help{font-size:.7rem;color:var(--dimmer);margin-top:8px;min-height:1em}
/* difficulty prompt modal — shown when a curated track card is tapped */
.sg-diff-overlay{position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:1000;display:flex;align-items:center;justify-content:center;padding:18px}
.sg-diff-box{background:var(--surf);border:1px solid var(--border);border-radius:var(--r);padding:18px;width:100%;max-width:420px;display:flex;flex-direction:column;gap:9px}
.sg-diff-title{font-weight:800;font-size:1rem}
.sg-diff-song{font-size:.82rem;color:var(--dim);margin-bottom:4px}
.sg-diff-opt{display:flex;flex-direction:column;gap:3px;text-align:left;background:var(--surf2);border:1px solid var(--border);border-radius:12px;padding:11px 14px;cursor:pointer;color:var(--text);font-family:inherit;transition:border-color .15s,background .15s}
.sg-diff-opt b{font-size:.9rem}
.sg-diff-opt span{font-size:.72rem;color:var(--dimmer);line-height:1.4}
.sg-diff-opt:hover{border-color:#EC4899}
.sg-diff-opt.on{border-color:#EC4899;background:rgba(236,72,153,.1)}
.sg-diff-cancel{margin-top:4px}

/* ── history ("📜 Lịch sử") — mirrors listening's .pool-toggle/.hist-* feel ── */
.sh-toggle{display:flex;align-items:center;justify-content:space-between;gap:10px;width:100%;background:linear-gradient(135deg,rgba(236,72,153,.09),rgba(190,24,93,.07));border:1px solid var(--border);border-radius:var(--r);padding:14px 16px;margin-bottom:16px;font-family:'Space Grotesk',sans-serif;font-size:.92rem;font-weight:700;color:var(--text);cursor:pointer;transition:border-color .18s;text-align:left}
.sh-toggle:hover{border-color:#EC4899}
.sh-chev{transition:transform .2s;color:#EC4899}
.sh-toggle.open .sh-chev{transform:rotate(180deg)}
.sh-list{background:var(--surf);border:1px solid var(--border);border-radius:var(--r);padding:6px 16px;margin:-10px 0 16px}
.sh-row{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;padding:9px 0;border-bottom:1px solid var(--border);font-size:.82rem}
.sh-row:last-child{border-bottom:none}
.sh-row-main{display:flex;align-items:center;gap:8px;flex-wrap:wrap;min-width:0;flex:1}
.sh-title{font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:220px}
.sh-badge{font-size:.66rem;font-weight:800;border-radius:8px;padding:2px 8px;background:rgba(236,72,153,.14);border:1px solid rgba(236,72,153,.35);color:#EC4899;flex-shrink:0}
.sh-badge-read{background:rgba(56,189,248,.14);border-color:rgba(56,189,248,.4);color:#38BDF8}
.sh-diff{font-size:.7rem;color:var(--dim);flex-shrink:0}
.sh-row-meta{display:flex;align-items:center;gap:10px;flex-shrink:0}
.sh-date{font-family:'JetBrains Mono',monospace;font-size:.7rem;color:var(--dimmer)}
.sh-score{font-family:'JetBrains Mono',monospace;font-weight:800;font-size:.78rem;color:#EC4899;min-width:38px;text-align:right}
.sh-replay{min-height:28px;padding:4px 10px;font-size:.7rem}
@media(max-width:600px){.sh-title{max-width:140px}}

/* ── track picker ── */
.track-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.track-card{background:var(--surf);border:1px solid var(--border);border-radius:var(--r);padding:15px;cursor:pointer;transition:all .18s;display:flex;flex-direction:column;gap:8px}
.track-card:hover{border-color:#EC4899;transform:translateY(-2px);box-shadow:0 8px 26px rgba(236,72,153,.13)}
.track-card.busy{opacity:.55;pointer-events:none}
.track-title{font-size:.92rem;font-weight:700;line-height:1.35}
.track-artist{font-size:.75rem;color:var(--dim);line-height:1.5}
.track-meta{display:flex;align-items:center;gap:6px;margin-top:auto;flex-wrap:wrap}
.lvl-chip{font-size:.68rem;font-weight:800;border-radius:8px;padding:3px 10px;background:rgba(236,72,153,.14);border:1px solid rgba(236,72,153,.35);color:#EC4899}
.track-dur{font-family:'JetBrains Mono',monospace;font-size:.72rem;color:var(--dim)}

/* ── play screen ── */
.play-top{display:flex;align-items:center;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.play-title{font-size:1rem;font-weight:700;flex:1;min-width:0;line-height:1.35}
.play-title small{display:block;font-size:.72rem;color:var(--dim);font-weight:400}
.play-score{font-family:'JetBrains Mono',monospace;font-size:.82rem;color:#EC4899;font-weight:700;white-space:nowrap}
.play-score .streak{color:var(--yellow);margin-left:8px}

/* Two-panel layout. The YouTube player lives ALONE inside .yt-host —
   nothing is ever positioned over it (YouTube ToS: no overlays). */
.yt-host{width:100%;aspect-ratio:16/9;background:#000;border:1px solid var(--border);border-radius:var(--r2);overflow:hidden}
.yt-host iframe,.yt-host>div{display:block;width:100%;height:100%}
.yt-hint{margin-top:10px;font-size:.76rem;line-height:1.5;color:var(--text2,#c5c9d8);background:rgba(245,158,11,.09);border:1px solid rgba(245,158,11,.35);border-radius:var(--r2);padding:8px 11px}

.lyrics-panel{margin-top:14px;display:flex;flex-direction:column;min-width:0}
.lyrics-status{font-size:.78rem;color:var(--dim);line-height:1.5;margin-bottom:9px;min-height:1.2em}
.lyrics-status.paused{color:var(--yellow);font-weight:700}
/* position:relative → .lyrics-box is the offsetParent of .sng-line, so
   line.offsetTop is measured in the box's own scroll space (autoscroll). */
.lyrics-box{position:relative;background:var(--surf);border:1px solid var(--border);border-radius:var(--r);padding:14px 16px;overflow-y:auto;max-height:46vh;scroll-behavior:smooth}
.play-ctrl{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.play-ctrl .btn{flex:1;min-width:140px;min-height:38px;padding:8px 12px;font-size:.8rem}

@media(min-width:880px){
  .play-wrap{max-width:1180px}
  .play-body{display:grid;grid-template-columns:minmax(320px,520px) 1fr;align-items:start;gap:24px}
  /* sticky so the video stays visible while lyrics scroll — beside, never over */
  .yt-panel{position:sticky;top:14px}
  .lyrics-panel{margin-top:0}
  .lyrics-box{max-height:62vh}
}

/* ── video speed control (read/sing modes) ── */
.sing-speed-ctrl,.play-speed-ctrl{display:flex;align-items:center;gap:8px;margin-top:8px;font-size:.78rem;color:var(--dim)}
.sing-speed-ctrl select,.play-speed-ctrl select{background:var(--surf2);border:1px solid var(--border);border-radius:9px;color:var(--text);font-family:'Space Grotesk',sans-serif;font-size:.8rem;padding:6px 10px;cursor:pointer}
.sing-speed-ctrl select:focus,.play-speed-ctrl select:focus{outline:none;border-color:#EC4899}

/* ── transpose extension tip (karaoke intro, desktop Chrome only) ── */
.sing-transpose-tip{margin-top:10px}
.sing-transpose-toggle{display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%;background:var(--surf2);border:1px solid var(--border);border-radius:var(--r2);padding:9px 12px;font-family:'Space Grotesk',sans-serif;font-size:.78rem;font-weight:700;color:var(--dim);cursor:pointer;text-align:left}
.sing-transpose-toggle:hover{border-color:#EC4899;color:var(--text)}
.sing-transpose-chev{transition:transform .2s;color:#EC4899}
.sing-transpose-toggle.open .sing-transpose-chev{transform:rotate(180deg)}
.sing-transpose-body{background:var(--surf);border:1px solid var(--border);border-top:none;border-radius:0 0 var(--r2) var(--r2);padding:10px 12px;font-size:.78rem;line-height:1.55;color:var(--dim)}
.sing-transpose-body a{color:#EC4899}

/* ── karaoke mixer (music volume + mic monitor) ── */
.sing-mixer{background:var(--surf2);border:1px solid var(--border);border-radius:var(--r2);padding:10px 12px;margin-top:8px}
.sing-mix-row{display:flex;align-items:center;gap:10px;margin:6px 0;font-size:.78rem;color:var(--text)}
.sing-mix-row input[type=range]{flex:1;accent-color:#EC4899;min-width:120px}
.sing-mix-val{font-family:'JetBrains Mono',monospace;font-size:.72rem;color:var(--dim);min-width:32px;text-align:right}
.sing-mix-note{font-size:.7rem;color:var(--dimmer);line-height:1.5;margin-top:4px}
.sing-mix-latency{font-family:'JetBrains Mono',monospace;font-size:.7rem;color:var(--dim);margin-top:4px}
.sing-mix-warn{background:rgba(245,158,11,.09);border:1px solid rgba(245,158,11,.35);border-radius:8px;padding:7px 10px;font-size:.72rem;line-height:1.5;color:var(--text2,#c5c9d8);margin-top:6px}

/* ── sing-mode chooser (🎤 Hát / 📖 Đọc lời) + context ── */
.sing-mode-row{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}
.sing-mode-card{flex:1;min-width:200px;display:flex;flex-direction:column;gap:6px;background:var(--surf2);border:1px solid var(--border);border-radius:var(--r2);padding:14px 16px;cursor:pointer;font-family:'Space Grotesk',sans-serif;color:var(--text);text-align:left;transition:all .15s}
.sing-mode-card:hover{border-color:#EC4899;transform:translateY(-1px)}
.sing-mode-card.on{border-color:#EC4899;background:rgba(236,72,153,.09);box-shadow:0 2px 14px rgba(236,72,153,.18)}
.sing-mode-card b{font-size:.92rem}
.sing-mode-card .dim-note{font-size:.74rem}
.sing-bpm-ctx{margin-top:8px}
.sing-bpm-ctx a{color:#EC4899;text-decoration:none}
.sing-bpm-ctx a:hover{text-decoration:underline}
.sing-pron-note{background:rgba(245,158,11,.09);border:1px solid rgba(245,158,11,.35);border-radius:var(--r2);padding:9px 12px;font-size:.78rem;line-height:1.55;color:var(--text2,#c5c9d8);margin:8px 0}
.lyrics-panel-full{margin-top:12px}
.lyrics-panel-full .lyrics-box{max-height:56vh}
.sing-active-read{background:rgba(236,72,153,.09);border-left:3px solid #EC4899}

/* ── lyric lines ── */
.sng-line{padding:8px 10px;border-radius:var(--r2);font-size:.98rem;line-height:2.1;color:var(--dim);transition:background .18s,color .18s;border-left:3px solid transparent}
.sng-line.active{background:rgba(236,72,153,.09);border-left-color:#EC4899;color:var(--text)}
.sng-line.done{opacity:.72}
.sng-line.gated{background:rgba(245,158,11,.09);border-left-color:var(--yellow)}
.sng-time{font-family:'JetBrains Mono',monospace;font-size:.64rem;color:var(--dimmer);margin-right:8px;vertical-align:1px}

.sng-blank{background:var(--surf2);border:1px solid var(--border2);border-bottom:2px solid #EC4899;border-radius:7px;padding:3px 5px;margin:0 2px;font-family:'JetBrains Mono',monospace;font-size:16px;color:var(--text);outline:none;text-align:center;vertical-align:baseline;transition:border-color .15s,background .15s}
.sng-blank:focus{border-color:#EC4899;background:rgba(236,72,153,.07)}
.sng-blank.shake{animation:sgshake .3s;border-color:var(--red)}
@keyframes sgshake{0%,100%{transform:translateX(0)}25%{transform:translateX(-4px)}50%{transform:translateX(4px)}75%{transform:translateX(-3px)}}
.sng-tok-ok{color:var(--green);font-weight:700;border-radius:5px;padding:1px 4px;background:rgba(34,197,94,.12);margin:0 1px}
.sng-tok-skip{color:var(--yellow);font-weight:700;border-radius:5px;padding:1px 4px;background:rgba(245,158,11,.14);margin:0 1px}
[data-theme="light"] .sng-tok-ok{color:#15803d}
[data-theme="light"] .sng-tok-skip{color:#b45309}

/* ── result panel ── */
.res-hero{text-align:center;padding:26px 16px}
.res-acc{font-family:'JetBrains Mono',monospace;font-size:2.6rem;font-weight:700;color:#EC4899}
.res-sub{font-size:.82rem;color:var(--dim);margin-top:4px}
.res-stats{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;margin-top:12px;font-size:.84rem}
.res-stats b{font-family:'JetBrains Mono',monospace}
.res-stats .ok b{color:var(--green)}
.res-stats .miss b{color:var(--yellow)}
.res-stats .score b{color:#EC4899}
.res-word{display:flex;align-items:baseline;gap:10px;padding:8px 0;border-bottom:1px solid var(--border);font-size:.84rem}
.res-word:last-child{border-bottom:none}
.res-word .w{font-family:'JetBrains Mono',monospace;font-weight:800;color:var(--yellow);flex-shrink:0}
.res-word .l{color:var(--dim);line-height:1.5;min-width:0}
.res-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:14px}
.res-actions .btn{flex:1;min-width:140px}
/* history result view — missed-word chips (read-only, no line text persisted) */
.res-missed-wrap{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}
.res-missed-chip{font-family:'JetBrains Mono',monospace;font-weight:700;font-size:.8rem;color:var(--yellow);background:rgba(245,197,67,.12);border:1px solid var(--border);border-radius:6px;padding:3px 9px}

/* ── ITEM 3 · save-to-Vault affordances on the result screen ── */
.res-word{flex-wrap:wrap}
.res-save-btn{margin-left:auto;flex:none;min-height:30px;padding:5px 12px;font-size:.72rem}
.res-save-btn.saved{background:rgba(34,197,94,.14);border-color:rgba(34,197,94,.4);color:var(--green)}
[data-theme="light"] .res-save-btn.saved{color:#15803d}
.res-word-tap{cursor:pointer;border-bottom:1px dashed var(--border2);transition:color .15s,background .15s;border-radius:3px;padding:0 1px}
.res-word-tap:hover{color:#EC4899;background:rgba(236,72,153,.1)}
.res-word-tap.saved{color:var(--green);border-bottom-style:solid;border-bottom-color:var(--green);background:rgba(34,197,94,.1)}
[data-theme="light"] .res-word-tap.saved{color:#15803d}
.res-word-tap.busy{opacity:.55;pointer-events:none}

/* ── ITEM 4 · congratulations header + accuracy tiers ── */
.res-congrats{font-size:1.05rem;font-weight:800;margin-bottom:6px;letter-spacing:.2px}
.res-hero{border-width:1px;border-style:solid;transition:box-shadow .25s,border-color .25s}
.res-hero.tier-low{--tier-c:#f87171}
.res-hero.tier-mid{--tier-c:#38BDF8}
.res-hero.tier-good{--tier-c:#22C55E}
.res-hero.tier-great{--tier-c:#F5C543}
.res-hero.tier-perfect{--tier-c:#EC4899}
.res-hero .res-congrats{color:var(--tier-c,#EC4899)}
.res-hero.tier-good,.res-hero.tier-great,.res-hero.tier-perfect{border-color:var(--tier-c)}
.res-hero.tier-great{box-shadow:0 0 0 1px rgba(245,197,67,.25),0 8px 26px rgba(245,197,67,.16)}
.res-hero.tier-perfect{box-shadow:0 0 0 1px rgba(236,72,153,.35),0 10px 34px rgba(236,72,153,.26)}

/* ── ITEM 4 · confetti burst (pure DOM + CSS keyframes, self-cleaning) ── */
#songsConfettiHost{position:fixed;inset:0;pointer-events:none;z-index:9700;overflow:hidden}
.sg-confetti-piece{position:absolute;top:-14px;border-radius:2px;opacity:.95;animation-name:sgConfettiFall;animation-timing-function:cubic-bezier(.35,.65,.55,1);animation-fill-mode:forwards}
@keyframes sgConfettiFall{
  0%{transform:translate(0,0) rotate(0deg);opacity:1}
  100%{transform:translate(var(--sg-drift,0),112vh) rotate(var(--sg-rot,180deg));opacity:0}
}
@media(prefers-reduced-motion: reduce){.sg-confetti-piece{display:none}}

@media(max-width:600px){
  .wrap{padding:16px 13px 32px}
  .page-title{font-size:1.35rem}
  .track-grid{grid-template-columns:1fr}
  .res-acc{font-size:2.1rem}
  .btn{padding:11px 14px}
  .lyrics-box{max-height:40vh}
  .sng-line{font-size:.92rem}
}

/* ════════════════════════════════════════════════════════════════════
   SING MODE (Sprint 3, songs/sing.js) — reuses .card/.btn/.res-*/.yt-*/
   .lyrics-*/.sng-line/.dim-note/.spin/.err-note tokens above.
   ════════════════════════════════════════════════════════════════════ */
.btn-sm{min-height:32px;padding:6px 12px;font-size:.78rem}
.sing-wrap{max-width:1180px}

/* ── intro (headphone/bleed warning) ── */
.sing-intro{text-align:center;padding:28px 22px}
.sing-intro-ic{font-size:2.4rem;margin-bottom:10px}
.sing-intro-title{font-size:1.1rem;font-weight:700;margin-bottom:12px}
.sing-intro-msg{font-size:.85rem;color:var(--dim);line-height:1.65;margin-bottom:10px;text-align:left}
.sing-intro-msg:last-child{margin-bottom:0}

/* ── active recording layout (mirrors .play-body) ── */
.sing-active{display:flex;flex-direction:column;gap:14px}
.sing-pitch-wrap{margin-top:10px}
#singPitchCanvas{width:100%;height:90px;display:block;background:var(--surf);border:1px solid var(--border);border-radius:var(--r2)}

/* ── live tuner (guitar-tuner style, sing mode only) ──
   Note name + a horizontal cents needle. sing.js window-gates this (only
   updates while the video is inside a sung lyric line + clarity/noise
   gates pass) so it shows a muted "waiting" state on intro/instrumental/
   gap noise instead of a jumping needle — see updateLiveTuner. */
.sing-tuner{margin-top:10px;background:var(--surf);border:1px solid var(--border);border-radius:var(--r2);padding:12px 14px;display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;transition:border-color .2s}
.sing-tuner-note{font-family:'JetBrains Mono',monospace;font-size:1.5rem;font-weight:800;color:var(--dimmer);transition:color .15s;min-height:1.2em}
.sing-tuner-meter{position:relative;width:100%;max-width:280px;height:10px;background:var(--surf2);border:1px solid var(--border);border-radius:6px;overflow:hidden}
/* ITEM 5 — the "in-tune zone": a centered translucent green band behind the
   needle, ~40% of the meter's width, so staying in tune reads as an
   achievable target rather than a razor-thin center line. Always visible
   (dim when not in-tune, brighter once .in-tune is active) — a pure CSS
   pseudo-element, no markup change needed from sing.js. */
.sing-tuner-meter::before{content:'';position:absolute;top:0;bottom:0;left:30%;width:40%;background:rgba(34,197,94,.14);border-radius:4px;z-index:0;transition:background-color .2s}
.sing-tuner-tick-center{position:absolute;top:0;bottom:0;left:50%;width:2px;background:var(--border2);transform:translateX(-50%);z-index:1}
.sing-tuner-needle{position:absolute;top:-3px;bottom:-3px;width:4px;left:50%;background:var(--dimmer);border-radius:2px;transform:translateX(-50%);transition:left .08s linear,background-color .15s;z-index:2}
.sing-tuner-status{font-size:.76rem;color:var(--dim);min-height:1.2em}

.sing-tuner.muted .sing-tuner-note{color:var(--dimmer)}
.sing-tuner.muted .sing-tuner-needle{background:var(--dimmer)}

/* .in-tune reads clearly "good": green text/needle + a subtle glow on the
   whole tuner card, and the in-tune zone behind the needle brightens up. */
.sing-tuner.in-tune{border-color:rgba(34,197,94,.55);box-shadow:0 0 0 1px rgba(34,197,94,.18),0 0 20px rgba(34,197,94,.22)}
.sing-tuner.in-tune .sing-tuner-note{color:var(--green)}
.sing-tuner.in-tune .sing-tuner-needle{background:var(--green);box-shadow:0 0 8px rgba(34,197,94,.6)}
.sing-tuner.in-tune .sing-tuner-status{color:var(--green);font-weight:700}
.sing-tuner.in-tune .sing-tuner-meter::before{background:rgba(34,197,94,.32)}
[data-theme="light"] .sing-tuner.in-tune .sing-tuner-note,
[data-theme="light"] .sing-tuner.in-tune .sing-tuner-status{color:#15803d}
[data-theme="light"] .sing-tuner.in-tune .sing-tuner-needle{background:#15803d}

.sing-tuner.flat,.sing-tuner.sharp{border-color:rgba(236,72,153,.4)}
.sing-tuner.flat .sing-tuner-note,.sing-tuner.sharp .sing-tuner-note{color:#EC4899}
.sing-tuner.flat .sing-tuner-needle,.sing-tuner.sharp .sing-tuner-needle{background:#EC4899}
.sing-tuner.flat .sing-tuner-status,.sing-tuner.sharp .sing-tuner-status{color:#EC4899;font-weight:700}

@media(max-width:600px){
  .sing-tuner-note{font-size:1.25rem}
}
@media(min-width:880px){
  .sing-active{display:grid;grid-template-columns:minmax(320px,520px) 1fr;align-items:start;gap:24px}
  .sing-active .yt-panel{position:sticky;top:14px}
}

/* ── result: 3-criteria breakdown ── */
.sing-criteria{display:flex;flex-direction:column;gap:16px}
.sing-crit-row{display:flex;flex-direction:column;gap:6px}
.sing-crit-head{display:flex;align-items:baseline;gap:8px;font-size:.9rem;font-weight:700}
.sing-crit-score{font-family:'JetBrains Mono',monospace;color:#EC4899;margin-left:auto}
.sing-crit-w{font-size:.68rem;font-weight:400;color:var(--dimmer)}
.sing-crit-bar{background:var(--surf2);border-radius:8px;height:8px;overflow:hidden}
.sing-crit-bar .fill{height:100%;background:linear-gradient(90deg,#EC4899,#BE185D);transition:width .3s ease}
.sing-crit-explain{font-size:.78rem;color:var(--dim);line-height:1.6}

/* ── worst-word practice rows ── */
.sing-word-row{padding:10px 0;border-bottom:1px solid var(--border)}
.sing-word-row:last-child{border-bottom:none}
.sing-word-top{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:6px}
.sing-word-top .w{font-family:'JetBrains Mono',monospace;font-weight:800;color:var(--yellow)}
.sing-word-top .sc{font-family:'JetBrains Mono',monospace;font-size:.78rem;color:var(--dim)}
.err-badge{font-size:.66rem;font-weight:700;color:var(--red);background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.28);border-radius:8px;padding:2px 8px}
[data-theme="light"] .err-badge{color:#b91c1c}
.sing-practice-panel{margin-top:8px;background:var(--surf2);border:1px solid var(--border);border-radius:var(--r2);padding:12px}
.sing-practice-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}

/* ════════════════════════════════════════════════════════════════════
   BYO — "Bài của bạn" (bring-your-own YouTube link, songs/byo.js)
   Mirrors listening/app.css's .byo-* tokens, re-themed to the pink
   #EC4899 accent used throughout songs/app.css.
   ════════════════════════════════════════════════════════════════════ */
.byo-entry{display:flex;align-items:center;gap:13px;background:linear-gradient(135deg,rgba(236,72,153,.1),rgba(190,24,93,.08));border:1px solid rgba(236,72,153,.35);border-radius:var(--r);padding:14px 16px;margin-bottom:16px;cursor:pointer;transition:all .18s}
.byo-entry:hover{border-color:#EC4899;transform:translateY(-1px);box-shadow:0 6px 22px rgba(236,72,153,.15)}
.byo-entry-ic{font-size:1.6rem}
.byo-entry-tx{flex:1;font-size:.88rem;line-height:1.5}
.byo-entry-sub{font-size:.76rem;color:var(--dim)}
.byo-entry-go{font-size:1.1rem;color:#EC4899;font-weight:800}
.byo-pro-chip{display:inline-block;background:linear-gradient(135deg,#F5C543,#E0902B);color:#3a2600;border-radius:20px;padding:1px 8px;font-size:.62rem;font-weight:800;vertical-align:2px;letter-spacing:.5px}

.byo-inp{background:var(--surf2);border:1px solid var(--border);border-radius:var(--r2);padding:10px 13px;font-family:'Space Grotesk',sans-serif;font-size:16px;color:var(--text);outline:none;transition:border-color .2s;width:100%}
.byo-inp:focus{border-color:#EC4899}
textarea.byo-inp{resize:vertical}
.byo-mini{min-height:32px;padding:5px 11px;font-size:.72rem}

.byo-diff-lbl{font-size:.76rem;font-weight:700;color:var(--dim);display:block;margin-bottom:6px}
.byo-diff-chips{display:flex;gap:8px;flex-wrap:wrap}
.byo-diff-chip{flex:1;min-width:84px;background:var(--surf2);border:1px solid var(--border);border-radius:10px;padding:8px 10px;font-size:.84rem;font-weight:700;color:var(--dim);cursor:pointer;font-family:'Space Grotesk',sans-serif;transition:all .15s}
.byo-diff-chip.on{background:rgba(236,72,153,.15);border-color:#EC4899;color:#EC4899}
.byo-diff-help{margin-top:7px;font-size:.74rem;min-height:1em}

#byoPlayerHost.yt-host{background:#000}
#byoScrWrap .card:last-child{margin-bottom:0}

.byo-contrib-badge{display:inline-block;margin-top:8px;background:rgba(236,72,153,.12);border:1px solid rgba(236,72,153,.35);color:#EC4899;border-radius:20px;padding:4px 12px;font-size:.72rem;font-weight:700}

/* ════════════════════════════════════════════════════════════════════
   TAP-RESYNC OVERLAY (songs/resync.js) — pink accent, matches .card/
   .btn tokens. Own #resyncPlayer keeps YouTube ToS's "no overlay on the
   player" rule intact — the overlay covers the whole screen, but the
   player it embeds is its own, distinct iframe, never stacked over
   #byoPlayer/#ytPlayer/#singYtPlayer.
   ════════════════════════════════════════════════════════════════════ */
.rsync-overlay{position:fixed;inset:0;z-index:9600;background:rgba(10,8,12,.72);display:flex;align-items:center;justify-content:center;padding:14px;overflow-y:auto}
.rsync-panel{background:var(--surf);border:1px solid var(--border2);border-radius:var(--r);max-width:760px;width:100%;max-height:92vh;display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(0,0,0,.45)}
.rsync-head{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;padding:16px 18px 10px}
.rsync-title{font-size:1rem;font-weight:800}
.rsync-sub{font-size:.78rem;font-weight:600;color:var(--dim);margin-top:3px}
.rsync-close{min-height:32px;min-width:32px;padding:4px 9px;flex:none}
.rsync-body{display:flex;flex-direction:column;gap:14px;padding:0 18px;overflow-y:auto;flex:1}
@media(min-width:720px){.rsync-body{flex-direction:row}}
.rsync-video{flex:none}
@media(min-width:720px){.rsync-video{width:280px}}
.rsync-tapctl{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.rsync-status{margin-top:8px;font-size:.74rem;line-height:1.5;min-height:2.2em}
.rsync-lines{flex:1;min-width:0;display:flex;flex-direction:column;gap:6px;max-height:340px;overflow-y:auto;padding-right:2px}
@media(min-width:720px){.rsync-lines{max-height:none}}
.rsync-line{display:flex;align-items:center;gap:8px;background:var(--surf2);border:1px solid var(--border);border-left:3px solid transparent;border-radius:8px;padding:6px 9px;font-size:.82rem}
.rsync-line.active{border-left-color:#EC4899;background:rgba(236,72,153,.09)}
.rsync-line-t{font-family:'JetBrains Mono',monospace;font-size:.72rem;color:#EC4899;flex:none;min-width:52px}
.rsync-line-tx{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rsync-line-ctl{display:flex;gap:4px;flex:none}
.rsync-mini{background:var(--surf3);border:1px solid var(--border2);border-radius:6px;padding:3px 7px;font-size:.68rem;font-weight:700;color:var(--dim);cursor:pointer;font-family:'Space Grotesk',sans-serif;transition:all .15s}
.rsync-mini:hover{border-color:#EC4899;color:#EC4899}
.rsync-foot{display:flex;gap:8px;flex-wrap:wrap;padding:14px 18px 18px}
.rsync-foot .btn{flex:1;min-width:130px}

/* ════════════════════════════════════════════════════════════════════
   CLASSROOM ACTIVITY (songs/class-play.js) — teacher plays the song on
   their own device; this student screen has NO video/player of its own,
   only the lyrics-fill UI (reuses .sng-line/.sng-blank/.sng-tok-ok/
   .lyrics-box/.lyrics-panel/.card/.btn/.res-*/.dim-note tokens above) plus
   the join banner on the picker and the lobby/countdown/gap status line.
   ════════════════════════════════════════════════════════════════════ */
.cls-wrap{max-width:760px}

.cls-join-banner{display:flex;align-items:center;gap:12px;background:var(--surf);border:1px solid #EC4899;border-radius:var(--r);padding:14px 16px;margin-bottom:16px;cursor:pointer;transition:all .18s;animation:cls-banner-in .35s ease-out}
.cls-join-banner:hover{transform:translateY(-2px);box-shadow:0 8px 26px rgba(236,72,153,.16)}
.cls-join-ic{font-size:1.6rem;flex:none}
.cls-join-tx{flex:1;min-width:0;font-size:.86rem;line-height:1.5}
.cls-join-sub{color:var(--dim);font-size:.78rem}
.cls-join-go{font-size:1.3rem;color:#EC4899;flex:none}
@keyframes cls-banner-in{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}

.cls-play-status{font-size:.86rem;font-weight:700;color:var(--dim);text-align:center;padding:10px 14px;border-radius:var(--r2);background:var(--surf2);border:1px solid var(--border);margin-bottom:14px}
.cls-play-status.paused{color:var(--yellow);background:rgba(245,158,11,.09);border-color:var(--yellow)}

.cls-countdown-big{display:flex;align-items:center;justify-content:center;font-size:5rem;font-weight:800;color:#EC4899;padding:30px 0;margin-bottom:10px}

/* ════════════════════════════════════════════════════════════════════
   RECORDING PLAYBACK (songs/sing.js result screen) — replaces the earlier
   live mic-monitor (removed: consumer-device round-trip latency made it
   audibly wrong). Reuses .card/.yt-host/.sing-mix-row/.sing-mix-val/
   .dim-note/.btn tokens above.
   ════════════════════════════════════════════════════════════════════ */
.sing-playback .yt-host{margin-bottom:10px}
.sing-pb-ctrl{display:flex;justify-content:center;margin-bottom:10px}
.sing-pb-note{margin-top:6px}

/* ── opt-in vocal upload ("💾 Lưu bản thu để chia sẻ") ── */
.sing-save-vocal{text-align:center}
.sing-save-vocal-note{margin-top:8px}
#singSaveVocalBtn.saved{background:rgba(34,197,94,.14);border-color:rgba(34,197,94,.4);color:var(--green)}
[data-theme="light"] #singSaveVocalBtn.saved{color:#15803d}

/* ── FIX 1: playback drift nudge ("🎚 Căn giọng sớm/muộn") — pauses,
   adjusts SG.vocalOffsetMs (±3s clamp), applied to the vocal on next ▶ ── */
.sing-drift-ctrl{margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}
.sing-drift-ctrl>label{display:block;font-size:.78rem;font-weight:700;color:var(--dim);margin-bottom:6px}
.sing-drift-row{display:flex;align-items:center;justify-content:center;gap:10px}
.sing-drift-row .btn{min-width:76px}
.sing-drift-val{font-family:'JetBrains Mono',monospace;font-size:.84rem;font-weight:700;color:var(--text);min-width:56px;text-align:center}

/* ── FEATURE 3: vocal FX select ("✨ Hiệu ứng giọng") — one dropdown,
   lazily builds a WebAudio graph (highpass + presence shelf + synthetic
   reverb send) on first non-"Tắt" pick; hidden silently if AudioContext
   construction fails (see ensureFxGraph/wirePlaybackPanel in sing.js) ── */
.sing-fx-ctrl{margin-top:10px;padding-top:10px;border-top:1px solid var(--border);display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.sing-fx-ctrl>label{font-size:.78rem;font-weight:700;color:var(--dim)}
.sing-fx-ctrl select{flex:1;min-width:160px;background:var(--surf2);border:1px solid var(--border2);border-radius:8px;padding:7px 10px;font-family:'Space Grotesk',sans-serif;font-size:.82rem;font-weight:600;color:var(--text)}
.sing-fx-ctrl select:focus{outline:none;border-color:#EC4899}

/* ── BYO mode toggle (Bài của bạn / Sing Stage) + karaoke link ── */
.byo-mode-toggle{display:flex;gap:8px;margin-bottom:14px}
.byo-mode-btn{flex:1;background:var(--surf2);border:1px solid var(--border);border-radius:var(--r2);padding:10px 14px;font-family:'Space Grotesk',sans-serif;font-size:.84rem;font-weight:700;color:var(--dim);cursor:pointer;transition:all .15s}
.byo-mode-btn:hover{border-color:#EC4899;color:var(--text)}
.byo-mode-btn.on{background:rgba(236,72,153,.12);border-color:#EC4899;color:#EC4899}
.byo-karaoke-link{margin-top:10px}

/* neutral 'answered' token in classroom mode — no correctness signal */
.sng-tok-locked{color:var(--dim);background:var(--surf2);border:1px solid var(--border2);border-radius:5px;padding:1px 6px;margin:0 1px;font-weight:600}

/* ── Playback refinements (sing.js): drift-nudge SLIDER (replaces the old
   ±0.25s buttons) + tiny ±20ms fine buttons, and the take's own transport
   (seek) bar — see playbackPanelHtml/wirePlaybackPanel in sing.js ── */
.sing-drift-row{flex-wrap:wrap}
.sing-drift-row input[type=range]{flex:1;min-width:140px;accent-color:#EC4899}
.sing-drift-row .btn{min-width:64px;padding:6px 8px;font-size:.74rem}
.sing-drift-val{display:block;text-align:center;margin-top:6px;font-family:'JetBrains Mono',monospace;font-size:.82rem;font-weight:700;color:var(--text)}

.sing-transport-ctrl{margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}
.sing-transport-row{display:flex;align-items:center;gap:10px}
.sing-transport-row input[type=range]{flex:1;accent-color:#EC4899;min-width:120px}
.sing-transport-time{font-family:'JetBrains Mono',monospace;font-size:.76rem;font-weight:600;color:var(--dim);min-width:36px;text-align:center}

/* ── "🔄 Tải lại video" recovery button — rendered under EVERY #singYtHost
   (active-recording ytPanelHtml + result-screen playbackPanelHtml), see
   reloadBtnHtml/reloadSingPlayer/wireReloadButton in sing.js. Disabled
   (via the .btn:disabled rule already defined above) mid-take. ── */
.sing-reload-row{display:flex;justify-content:center;margin-top:8px}
.sing-reload-hint{margin-top:4px;text-align:center}

/* ── FIX 3: one-way "🎚 Đưa giọng ra sớm hơn" drift guide — plain-language
   copy under the slider/fine buttons explaining WHY (mic latency is always
   late, never early) and HOW to use it, replacing the old two-way ± note.
   See playbackPanelHtml/wirePlaybackPanel in sing.js. ── */
.sing-drift-guide{margin-top:8px}