:root{
  color-scheme:dark;
  --ink:#f5f3eb;--muted:#b9c6bf;--gold:#e4c899;--gold-ink:#18231c;
  --glass:rgba(10,18,16,.46);--glass-strong:rgba(14,24,21,.86);--line:rgba(255,255,255,.13);
  --st:env(safe-area-inset-top,0px);--sr:env(safe-area-inset-right,0px);--sb:env(safe-area-inset-bottom,0px);--sl:env(safe-area-inset-left,0px);
  --vvh:100dvh;
  font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:#0b1110;color:var(--ink);
}
*{box-sizing:border-box}
html{background:#0b1110;overscroll-behavior:none;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;min-height:100%;overflow:hidden;background:#0b1110}
/* Touch screens get an invisible document scroll runway: it is the only thing a
   swipe can scroll, and scrolling the document is what collapses mobile toolbars. */
html.touch{scrollbar-width:none}
html.touch::-webkit-scrollbar{display:none}
html.touch body{overflow:visible;min-height:400lvh}
button,a,input{-webkit-tap-highlight-color:transparent}
button{font:inherit;color:inherit;cursor:pointer;touch-action:manipulation;border:0;background:none;padding:0}
button:disabled{opacity:.45;cursor:wait}
button:focus-visible,a:focus-visible,input:focus-visible,#stage:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
a{color:inherit}
svg{width:22px;height:22px;flex-shrink:0}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

#probes i{position:fixed;left:-20px;top:0;width:1px;visibility:hidden;pointer-events:none}
#probe-svh{height:100svh}#probe-lvh{height:100lvh}#probe-dvh{height:100dvh}

/* Stage: the visual fills the viewport; JS sizes the videos to cover and pans
   them with a compositor-only transform clamped to the video edges. */
#stage{position:fixed;inset:0;overflow:hidden;touch-action:manipulation;background:radial-gradient(ellipse at 30% 25%,#2c4a42,#0b1110 70%);-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;outline:none}
.visual{position:absolute;left:50%;top:50%;width:100%;height:100%;object-fit:cover;transform:translate(-50%,-50%);opacity:0;transition:opacity .5s ease;pointer-events:none}
.visual.active{opacity:1}
.shade{position:fixed;left:0;right:0;bottom:0;height:42%;background:linear-gradient(rgba(4,10,9,0),rgba(4,10,9,.5));pointer-events:none;transition:opacity .3s;z-index:1}

.topbar{position:fixed;z-index:3;top:max(10px,var(--st));left:max(16px,var(--sl));pointer-events:none;transition:opacity .25s,transform .25s}
.wordmark{pointer-events:auto;display:inline-block;font-family:Georgia,serif;font-size:26px;line-height:1;letter-spacing:-1.6px;text-decoration:none;text-shadow:0 1px 12px #0008;padding:6px 2px}
.wordmark span{display:block;letter-spacing:2px;font:7px/2 ui-sans-serif,sans-serif;opacity:.7;margin:3px 0 0 2px}

/* Dock: compact, translucent, inside the visual viewport and safe areas. */
#dock{position:fixed;z-index:4;left:max(8px,var(--sl));right:max(8px,var(--sr));bottom:max(8px,var(--sb));margin:0 auto;max-width:540px;
  display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"track tools" "scrub scrub" "transport transport" "speed speed" "status status";
  align-items:center;column-gap:6px;padding:6px 8px 4px 8px;border-radius:22px;background:var(--glass);border:1px solid var(--line);
  -webkit-backdrop-filter:blur(18px) saturate(1.25);backdrop-filter:blur(18px) saturate(1.25);box-shadow:0 10px 40px #0004;transition:opacity .25s,transform .25s}
.ui-hidden #dock,.ui-hidden .topbar{opacity:0;transform:translateY(10px);pointer-events:none;visibility:hidden;transition:opacity .25s,transform .25s,visibility 0s linear .25s}
.ui-hidden .topbar{transform:translateY(-10px)}
.ui-hidden .shade{opacity:0}

.track-button{grid-area:track;display:flex;align-items:center;gap:10px;min-width:0;min-height:44px;text-align:left;border-radius:14px;padding:2px 4px}
.cover{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;color:#ecdcb0;background:radial-gradient(circle at 70% 30%,#8ea880,#2f4a3e 72%);box-shadow:inset 0 0 0 1px #ffffff17;flex-shrink:0}
.cover svg{width:20px;height:20px}
.track-copy{min-width:0;flex:1}
.track-copy strong{display:block;font-weight:560;font-size:15px;line-height:1.2;letter-spacing:-.2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.track-copy>span{display:block;font-size:10.5px;color:var(--muted);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tools{grid-area:tools;display:flex;align-items:center;gap:2px}
.chip{display:inline-flex;align-items:center;gap:4px;min-height:44px;min-width:44px;padding:0 8px;border-radius:14px;font-size:12px;font-variant-numeric:tabular-nums;color:#e8ece7}
.chip svg{width:17px;height:17px;opacity:.85}
.chip[aria-expanded=true]{color:var(--gold);background:#ffffff10}
.icon{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:50%;color:#eef1ec}
.icon.small{font-size:20px;min-width:44px;min-height:44px}
.icon:hover,.chip:hover,.track-button:hover{background:#ffffff0e}
.icon[aria-pressed=true]{color:var(--gold)}

.scrub{grid-area:scrub;display:flex;align-items:center;gap:8px;min-width:0;height:30px}
.time{font:10px/1 ui-monospace,SFMono-Regular,monospace;color:var(--muted);font-variant-numeric:tabular-nums;min-width:30px}
#duration{text-align:right}
.timeline{position:relative;flex:1;min-width:60px;height:24px;border-radius:5px;overflow:hidden}
#waveform{position:absolute;inset:0;width:100%;height:100%}
#played{position:absolute;inset:0 auto 0 0;width:0;background:#e4c8991f;border-right:1.5px solid var(--gold);pointer-events:none}
#core-marker{position:absolute;bottom:0;height:2px;border-radius:2px;background:var(--gold);opacity:.75;pointer-events:none}
#seek{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer;touch-action:pan-y}
#seek:focus-visible{opacity:.2}

.transport{grid-area:transport;display:flex;align-items:center;justify-content:space-between;max-width:330px;width:100%;margin:0 auto;padding:2px 0}
.skip{position:relative}
.skip small{position:absolute;font-size:7.5px;font-weight:700;top:50%;left:50%;transform:translate(-50%,-38%);pointer-events:none}
.play{display:grid;place-items:center;width:50px;height:50px;border-radius:50%;background:var(--gold);color:var(--gold-ink);box-shadow:0 0 22px #e4c89926;flex-shrink:0}
.play svg{width:24px;height:24px}
.play.loading{animation:breathe 1.2s infinite}
.speed-row{grid-area:speed;display:flex;align-items:center;justify-content:center;gap:4px;padding:2px 0 4px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
.preset{min-height:44px;min-width:44px;padding:0 8px;border-radius:12px;font-size:12px;border:1px solid var(--line);font-variant-numeric:tabular-nums;flex-shrink:0}
.preset[aria-pressed=true]{background:var(--gold);border-color:var(--gold);color:var(--gold-ink)}
.status{grid-area:status;margin:0;font-size:9px;letter-spacing:1.2px;color:#c6d4ca;text-align:center;min-height:0;line-height:1.5;text-transform:uppercase;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.status:empty{display:none}
#error{grid-area:status;font-size:12px;color:#ffd7b2;line-height:1.4;padding:4px 6px 6px;text-align:center}

/* Landscape phones and wide screens: one slim row. */
@media (min-width:560px) and (max-height:520px),(min-width:760px){
  #dock{max-width:880px;grid-template-columns:minmax(96px,1.15fr) auto minmax(120px,2fr) auto;grid-template-areas:"track transport scrub tools" "speed speed speed speed" "status status status status";column-gap:8px;padding:4px 8px;border-radius:20px}
  .transport{max-width:none;width:auto;gap:2px;padding:0}
  .transport .skip{display:none}
  .play{width:44px;height:44px}
  .cover{width:32px;height:32px}
  .track-copy strong{font-size:14px}
  .topbar{top:max(8px,var(--st))}
}
@media (min-width:900px) and (min-height:521px){.transport .skip{display:inline-flex}}
/* Narrow landscape (SE-class phones): give the title room before the chips. */
@media (min-width:560px) and (max-width:719px) and (max-height:520px){
  .track-button .cover,.chip svg{display:none}
  .chip{padding:0 6px}
  #dock{grid-template-columns:minmax(110px,1.3fr) auto minmax(110px,2fr) auto;column-gap:4px}
  .scrub{gap:5px}
}
@media (max-width:359px){
  #dock{left:max(5px,var(--sl));right:max(5px,var(--sr));padding:5px 5px 3px;column-gap:2px}
  .chip{padding:0 5px}
  .chip svg{display:none}
  .cover{display:none}
  .track-copy strong{font-size:14px}
}

/* Hidden UI: a hint that fully fades after 3 s, so nothing stays on the video. */
.reveal{position:fixed;z-index:5;left:50%;bottom:max(18px,calc(var(--sb) + 10px));transform:translateX(-50%);display:flex;align-items:center;gap:7px;padding:9px 15px;border-radius:30px;font-size:12px;color:#f4f2ea;
  background:rgba(10,18,16,.38);border:1px solid #ffffff1c;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);opacity:0;visibility:hidden;transition:opacity .9s ease,visibility 0s linear .9s;white-space:nowrap}
.reveal svg{width:16px;height:16px}
.reveal.visible{opacity:1;visibility:visible;transition:opacity .25s ease}
/* After the fade the pill stays reachable by keyboard and reappears on focus. */
.ui-hidden .reveal{visibility:visible;pointer-events:none}
.ui-hidden .reveal.visible,.reveal:focus-visible{opacity:1;pointer-events:auto}
body:not(.ui-hidden) .reveal{opacity:0;visibility:hidden;transition:none}
.frame-row{display:flex;align-items:center;gap:6px;margin-top:10px;flex-wrap:wrap}
.frame-label{font-size:11px;color:var(--muted);margin-right:4px}

.toast{position:fixed;z-index:20;left:50%;top:max(12px,calc(var(--st) + 6px));transform:translate(-50%,-6px);max-width:min(440px,calc(100% - 32px));padding:9px 15px;border-radius:18px;font-size:12.5px;line-height:1.35;text-align:center;color:#f6f3ea;
  background:rgba(12,20,18,.5);border:1px solid #ffffff1f;-webkit-backdrop-filter:blur(16px) saturate(1.3);backdrop-filter:blur(16px) saturate(1.3);box-shadow:0 8px 30px #0003;opacity:0;pointer-events:none;transition:opacity .3s,transform .3s}
.toast.visible{opacity:1;transform:translate(-50%,0)}
.toast b{color:var(--gold);font-weight:600}

.hint{position:fixed;z-index:6;left:50%;top:50%;transform:translate(-50%,-50%);display:flex;align-items:center;gap:6px;padding:8px 14px;border-radius:24px;font-size:13px;background:rgba(10,18,16,.42);border:1px solid #ffffff1c;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);opacity:0;pointer-events:none;white-space:nowrap}
.hud{position:fixed;z-index:6;left:50%;top:42%;transform:translate(-50%,-50%) scale(.96);padding:12px 20px;border-radius:22px;font:600 26px/1 ui-sans-serif,-apple-system,sans-serif;font-variant-numeric:tabular-nums;background:rgba(10,18,16,.42);border:1px solid #ffffff1c;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);opacity:0;pointer-events:none;transition:opacity .35s,transform .35s}
.hud.visible{opacity:1;transform:translate(-50%,-50%) scale(1)}
.hud small{display:block;font:500 10px/1.6 ui-sans-serif,sans-serif;letter-spacing:1.4px;text-transform:uppercase;color:var(--muted);text-align:center;margin-top:4px}

/* Toolbar coach: informational only; touches pass through to the stage, whose
   vertical scrolling is native while the coach is up. */
.coach{position:fixed;z-index:15;inset:0;display:grid;place-items:center;padding:max(14px,env(safe-area-inset-top)) max(22px,env(safe-area-inset-right)) max(14px,env(safe-area-inset-bottom)) max(22px,env(safe-area-inset-left));background:radial-gradient(130% 100% at 50% 50%,rgba(3,8,7,.56),rgba(3,8,7,.8));pointer-events:none;opacity:0;visibility:hidden;transition:opacity .35s,visibility 0s linear .35s}
.coach.visible{opacity:1;visibility:visible;transition:opacity .35s}
.coach-card{display:flex;align-items:center;gap:clamp(18px,4vw,36px);max-width:min(640px,100%)}
.coach-card button{pointer-events:auto}
.coach-track{position:relative;flex-shrink:0;width:58px;height:min(168px,calc(var(--vvh,100dvh)*.56));border-radius:29px;border:1.5px solid #ffffff38;background:#ffffff0a;overflow:hidden}
.coach-trail{position:absolute;left:50%;bottom:12%;width:4px;height:0;margin-left:-2px;border-radius:2px;background:linear-gradient(to top,#e4c89900,#e4c899d0);animation:coach-trail 1.9s cubic-bezier(.45,0,.25,1) infinite}
.coach-finger{position:absolute;left:50%;bottom:4%;width:34px;height:34px;margin-left:-15px;color:var(--gold);animation:coach-finger 1.9s cubic-bezier(.45,0,.25,1) infinite}
.coach-finger svg{display:block;width:34px;height:34px}
.coach-arrow{position:absolute;left:50%;top:9px;width:22px;height:22px;margin-left:-11px;color:#ffffffb8}
.coach-copy{display:flex;flex-direction:column;align-items:flex-start;min-width:0}
.coach-copy strong{display:block;font-size:clamp(20px,3.6vw,28px);font-weight:620;letter-spacing:-.4px;line-height:1.15}
.coach-copy span{display:block;font-size:14px;color:#e4ebe6;margin-top:6px;line-height:1.4;max-width:36ch}
.coach-copy .coach-alt{display:block;font-size:11px;color:var(--muted);margin-top:6px}
.coach-continue{margin-top:12px;min-height:44px;padding:0 16px;border-radius:22px;border:1px solid #ffffff33;font-size:13px;white-space:nowrap;background:#ffffff12}
@keyframes coach-finger{0%{bottom:4%;opacity:0}12%{opacity:1}72%{bottom:60%;opacity:1}100%{bottom:66%;opacity:0}}
@keyframes coach-trail{0%{height:0;opacity:0}12%{opacity:1}72%{height:50%;opacity:1}100%{height:54%;opacity:0}}
@media (orientation:landscape){body:not(.ui-hidden) .coach{padding-bottom:calc(68px + env(safe-area-inset-bottom))}} /* keep the lesson clear of the landscape dock */
@media (max-width:479px){.coach-card{flex-direction:column;text-align:center}.coach-copy{align-items:center}.coach-track{height:min(140px,calc(var(--vvh,100dvh)*.3))}}
@keyframes breathe{50%{opacity:.5}}

/* Dialogs: bottom sheets on phones, cards on wide screens. */
dialog{color:var(--ink);background:var(--glass-strong);-webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);border:1px solid var(--line);border-radius:24px 24px 0 0;padding:16px max(16px,var(--sr)) max(16px,calc(var(--sb) + 10px)) max(16px,var(--sl));
  width:min(620px,100%);max-width:100%;margin:auto auto 0;max-height:calc(var(--vvh) - var(--st) - 12px);overflow-y:auto;overscroll-behavior:contain;box-shadow:0 -20px 80px #0007}
dialog::backdrop{background:#04090888}
@media (min-width:760px) and (min-height:521px){dialog{margin:auto;border-radius:24px;max-height:min(86dvh,860px)}}
@media (min-width:560px) and (max-height:520px){dialog{width:min(640px,calc(100% - 24px));border-radius:20px 20px 0 0}}
.drawer-head{display:flex;justify-content:space-between;gap:12px;align-items:center;margin:-4px 0 8px;position:sticky;top:-16px;z-index:2;background:linear-gradient(#141f1cf2 80%,#141f1c00);padding:6px 0}
.drawer-head>div{min-width:0}
.eyebrow{font-size:8.5px;font-weight:600;letter-spacing:2px;color:#c8d7ce}
h2{font:26px/1.2 Georgia,serif;letter-spacing:-.6px;font-weight:400;margin:2px 0 0}
h3{font-size:11px;letter-spacing:1.6px;text-transform:uppercase;font-weight:600;color:#cfdcd3;margin:0 0 8px;display:flex;justify-content:space-between}
h3 span{color:var(--gold);letter-spacing:0;text-transform:none;font-variant-numeric:tabular-nums}
.sheet-section{padding:12px 0;border-top:1px solid #ffffff12}
.visual-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px}
.visual-grid button{min-height:44px;border-radius:12px;border:1px solid var(--line);font-size:13px;font-variant-numeric:tabular-nums}
.visual-grid button[aria-pressed=true]{background:var(--gold);color:var(--gold-ink);border-color:var(--gold)}
.speed-grid{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.sheet-note{font-size:11px;color:var(--muted);line-height:1.5;margin:8px 0 0}
.sheet-actions{display:flex;flex-wrap:wrap;gap:8px}
.pill{display:inline-flex;align-items:center;gap:7px;border:1px solid #ffffff22;background:#0d18176e;border-radius:30px;padding:0 14px;min-height:44px;font-size:12.5px;text-decoration:none}
.pill svg{width:17px;height:17px}
.count{border:1px solid #ffffff22;border-radius:5px;padding:1px 4px;font-size:9px;color:var(--muted)}
.help{list-style:none;margin:0;padding:0;display:grid;gap:6px;font-size:12.5px;color:#dde5df}
.help b{display:inline-block;min-width:118px;color:var(--gold);font-weight:560}

.library-tools{display:flex;gap:8px;margin:0 0 10px}
.search{display:flex;align-items:center;gap:8px;border:1px solid #ffffff1c;border-radius:12px;background:#0d17144a;padding:0 12px;flex:1;min-width:0;color:var(--muted)}
.search svg{width:18px;height:18px}
.search input{border:0;background:transparent;color:var(--ink);font-size:16px;min-height:44px;width:100%;min-width:0;font-family:inherit;outline:none}
.filters{display:flex;gap:6px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;padding:2px 0 5px}
.filter{padding:8px 11px;border:1px solid #ffffff1b;border-radius:30px;font-size:11px;min-height:44px;flex-shrink:0}
.filter[aria-pressed=true]{background:var(--gold);border-color:var(--gold);color:var(--gold-ink)}
.result-count{color:var(--muted);font-size:10px;margin:10px 2px 8px}
.song-row{display:flex;align-items:center;gap:4px;border-top:1px solid #ffffff10;min-height:68px}
.song-row.selected{background:#d6e8b90d;border-radius:10px;box-shadow:inset 3px 0 var(--gold)}
.song-select{padding:10px 6px;display:flex;align-items:center;gap:11px;flex:1;min-width:0;text-align:left}
.song-select .cover{width:34px;height:34px;border-radius:10px}
.song-text{min-width:0;flex:1}
.song-text strong{font-size:13px;font-weight:520;display:block;line-height:1.3}
.song-text small{display:block;font-size:10px;color:var(--muted);line-height:1.4;margin-top:2px}
.song-text .duration{color:#ddcba8;margin-top:3px;font:9px ui-monospace,monospace}
.song-row .icon svg{width:19px;height:19px}
.library-note{color:#aebbb5a8;font-size:10px;line-height:1.7;margin:16px 2px 0}
#details p{font-size:13px;line-height:1.7;color:var(--muted)}
#details-content{display:flex;flex-direction:column;align-items:flex-start;gap:4px}
#details-content .pill{margin-top:6px}
@media (max-width:359px){.song-select .cover{display:none}.help b{min-width:100px}h2{font-size:22px}}

@media (prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important}.coach-finger{bottom:60%}.coach-trail{height:50%}}