:root{
  /* Layout: fixed left rail of sections; a wide work column where the "studio" (line + pitch chart + transport) is the hero. */
  --bg:#F4F5F7; --surface:#FFFFFF; --ink:#16202E; --muted:#5D6778; --line:#DDE1E8;
  --ref:#3D6FE8; --ref-soft:rgba(61,111,232,.16); --you:#E2861B;
  --good:#1E8A57; --warn:#B7791F; --bad:#C7413A;
  --grid:rgba(22,32,46,.07); --band:rgba(22,32,46,.025);
  --display:"Instrument Sans", "Segoe UI", system-ui, sans-serif;
  --body:"IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --script:"Courier Prime", "Courier New", ui-monospace, monospace;
  --r:12px;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0F131A; --surface:#171C25; --ink:#E7EBF2; --muted:#98A2B3; --line:#2A3140;
    --ref:#6E95FF; --ref-soft:rgba(110,149,255,.2); --you:#F5A445;
    --good:#4CC38A; --warn:#E3B04B; --bad:#F07A72;
    --grid:rgba(231,235,242,.08); --band:rgba(231,235,242,.03);
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0F131A; --surface:#171C25; --ink:#E7EBF2; --muted:#98A2B3; --line:#2A3140;
  --ref:#6E95FF; --ref-soft:rgba(110,149,255,.2); --you:#F5A445;
  --good:#4CC38A; --warn:#E3B04B; --bad:#F07A72;
  --grid:rgba(231,235,242,.08); --band:rgba(231,235,242,.03);
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--ink);font:16px/1.55 var(--body)}
h1,h2,h3{font-family:var(--display);margin:0;line-height:1.2;text-wrap:balance}
h1{font-size:28px;font-weight:700;letter-spacing:-.01em}
h2{font-size:20px;font-weight:600}
h3{font-size:16px;font-weight:600}
p{margin:0}
a{color:var(--ref)}
button,select,input,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--ref);outline-offset:2px;border-radius:6px}

.shell{display:grid;grid-template-columns:220px minmax(0,1fr);min-height:100%}
.side{position:sticky;top:0;height:100vh;padding:22px 16px;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:24px;background:var(--surface)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:var(--display);font-weight:700;font-size:18px}
.brand svg{width:30px;height:30px;fill:none;stroke:var(--ref);stroke-width:3.5;stroke-linecap:round;background:var(--ink);border-radius:7px}
#nav{display:flex;flex-direction:column;gap:2px}
#nav a{padding:8px 12px;border-radius:8px;text-decoration:none;color:var(--muted);font-weight:500}
#nav a:hover{background:var(--bg);color:var(--ink)}
#nav a[aria-current="page"]{background:var(--ref-soft);color:var(--ink);font-weight:600}
.side-foot{margin-top:auto;font-size:12px;color:var(--muted)}
main{padding:28px 32px 60px;max-width:1100px;width:100%;display:flex;flex-direction:column;gap:22px;outline:none}
@media (max-width:820px){
  .shell{grid-template-columns:1fr}
  .side{position:static;height:auto;flex-direction:row;flex-wrap:wrap;align-items:center;gap:10px;padding:12px 16px;border-right:0;border-bottom:1px solid var(--line)}
  #nav{flex-direction:row;flex-wrap:wrap}
  #nav a{padding:6px 10px;font-size:14px}
  .side-foot{display:none}
  main{padding:18px 16px 48px}
}

.lede{color:var(--muted);max-width:68ch}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px;display:flex;flex-direction:column;gap:12px;min-width:0}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.muted{color:var(--muted)}
.small{font-size:13px}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
ul.tight{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:4px}

.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--surface);padding:9px 14px;border-radius:10px;font-weight:600;text-decoration:none;color:var(--ink);white-space:nowrap}
.btn:hover{border-color:var(--muted)}
.btn.primary{background:var(--ref);border-color:var(--ref);color:#fff}
.btn.rec{background:var(--bad);border-color:var(--bad);color:#fff}
.btn.rec.live{animation:pulse 1s infinite}
.btn.you{border-color:var(--you)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn kbd{font:11px var(--body);border:1px solid currentColor;border-radius:4px;padding:0 4px;opacity:.6}
@keyframes pulse{50%{opacity:.7}}
@media (prefers-reduced-motion:reduce){.btn.rec.live{animation:none}}
select,input[type=text],textarea{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:7px 10px}
textarea{width:100%;min-height:140px;resize:vertical;font-family:var(--script)}

/* unit + drill cards */
.unit{text-decoration:none;color:inherit}
.unit:hover{border-color:var(--ref)}
.unit .num{font-family:var(--script);color:var(--muted);font-size:13px}
.bar{height:6px;background:var(--line);border-radius:3px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--ref)}
.pill{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;font-weight:600;border:1px solid var(--line);color:var(--muted)}
.pill.good{color:var(--good);border-color:var(--good)}
.pill.warn{color:var(--warn);border-color:var(--warn)}
.pill.bad{color:var(--bad);border-color:var(--bad)}
.pill.on{background:var(--ref);border-color:var(--ref);color:#fff}

/* studio */
.studio{gap:16px}
.studio-head{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;align-items:center}
.script{font-family:var(--script);font-size:26px;line-height:1.45;letter-spacing:.01em}
.script strong{color:var(--ref);font-weight:700}
.script .lk{color:var(--you);font-weight:700}
.script .tg{color:var(--muted);padding:0 .15em}
.script .rd{font-size:.62em;color:var(--muted);vertical-align:.25em}
.script .ar{color:var(--you)}
.speaker{font-family:var(--script);font-size:13px;letter-spacing:.12em;color:var(--muted)}
.note{background:var(--bg);border-left:3px solid var(--you);padding:8px 12px;border-radius:6px;font-size:14px}
.viz{width:100%;height:260px;display:block;cursor:pointer;touch-action:pan-y}
.legend{display:flex;gap:18px;font-size:13px;color:var(--muted);flex-wrap:wrap}
.legend span::before{content:"";display:inline-block;width:18px;height:4px;border-radius:2px;margin-right:6px;vertical-align:middle;background:var(--c)}
.transport{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.meter{height:6px;border-radius:3px;background:var(--line);overflow:hidden;width:120px}
.meter i{display:block;height:100%;width:0;background:var(--bad);transition:width .05s}
.scores{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}
@media (max-width:600px){.scores{grid-template-columns:repeat(3,minmax(0,1fr))}}
.score{border:1px solid var(--line);border-radius:10px;padding:10px 12px;display:flex;flex-direction:column;gap:2px}
.score b{font-family:var(--display);font-size:26px;font-variant-numeric:tabular-nums}
.score span{font-size:12px;color:var(--muted)}
.score.lead{background:var(--ref-soft);border-color:transparent}
.notes{display:flex;flex-direction:column;gap:8px;margin:0;padding:0;list-style:none}
.notes li{padding:10px 12px;border-radius:8px;background:var(--bg);border-left:3px solid var(--c, var(--ref))}
.notes li[data-k="melody"]{--c:var(--ref)} .notes li[data-k="rhythm"]{--c:var(--you)} .notes li[data-k="stress"]{--c:var(--bad)} .notes li[data-k="flow"]{--c:var(--warn)} .notes li[data-k="good"]{--c:var(--good)}
.howto{margin:0;padding:10px 14px 10px 32px;background:var(--ref-soft);border-radius:8px;display:flex;flex-direction:column;gap:2px}
.howto[hidden]{display:none}
.takes{display:flex;flex-wrap:wrap;gap:8px}
.items{display:flex;flex-wrap:wrap;gap:6px}
.items button{min-width:34px;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:4px 8px;font-size:13px;font-variant-numeric:tabular-nums}
.items button[aria-current="true"]{border-color:var(--ref);background:var(--ref-soft);font-weight:700}
[data-r="hist"] button[aria-current="true"]{border-color:var(--you);font-weight:700}
.items button.done{color:var(--good)}

/* today */
.steps{display:flex;flex-direction:column;gap:10px;counter-reset:s}
.step{display:grid;grid-template-columns:44px minmax(0,1fr) auto;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;text-decoration:none;color:inherit}
.step:hover{border-color:var(--ref)}
.step .min{font-family:var(--script);font-size:13px;color:var(--muted);text-align:center}
.step.done{opacity:.65}
.step.done .min{color:var(--good)}

.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px}
.tile{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px}
.tile b{display:block;font-family:var(--display);font-size:30px;font-variant-numeric:tabular-nums}
.tile span{font-size:13px;color:var(--muted)}
.spark{width:100%;height:46px;display:block}
table{border-collapse:collapse;width:100%;font-size:14px}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}
th{font-weight:600;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.06em}
td.num{font-variant-numeric:tabular-nums}
.tablewrap{overflow-x:auto}

.lineitem{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}
.lineitem .t{font-family:var(--script)}
.prose{max-width:72ch;display:flex;flex-direction:column;gap:12px}
.prose h2{margin-top:14px}
.prose p, .prose li{color:var(--ink)}
#toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:10px;font-size:14px;opacity:0;pointer-events:none;transition:opacity .2s;max-width:90vw}
#toast.on{opacity:1}
.empty{padding:20px;border:1px dashed var(--line);border-radius:var(--r);color:var(--muted)}
.status{min-height:1.4em;color:var(--muted)}
.status.live{color:var(--bad);font-weight:600}
.status.bad{color:var(--bad)}
.micbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:8px 12px;border:1px dashed var(--line);border-radius:10px}
.micbar select{max-width:260px}
.meter.wide{width:160px}
details.more{display:inline-block}
details.more summary{list-style:none}
details.more summary::-webkit-details-marker{display:none}
.micwrap[open] summary{margin-bottom:6px}
.script.hidden-line{filter:blur(9px);user-select:none}
.script.hidden-line:hover{filter:blur(6px)}
.welcome{border-color:var(--ref);background:linear-gradient(0deg,var(--surface),var(--surface)),var(--surface)}
.ear{margin-top:12px;display:flex;flex-direction:column;gap:6px}
.earline{display:flex;flex-wrap:wrap;gap:6px;font-family:var(--script);font-size:17px}
.earline .w{padding:1px 6px;border-radius:6px}
.earline .ok{background:color-mix(in srgb,var(--good) 14%,transparent);color:var(--good)}
.earline .bad{background:color-mix(in srgb,var(--bad) 14%,transparent);color:var(--bad);font-weight:700}
.earline .bad small{font-weight:400}
.earline .extra{color:var(--muted)}
.notes li[data-k="ear"]{--c:var(--bad)}
.notes li a{margin-left:8px;white-space:nowrap}
.done-card{border-color:var(--good)}
td.up{color:var(--good);font-weight:600}
td.down{color:var(--bad)}
.ba-list{display:flex;flex-direction:column}
.privacy-note{background:var(--bg);padding:8px 12px;border-radius:8px}
.warn-text{color:var(--warn)}
/* karaoke */
.script .kw{border-radius:5px;padding:0 .08em;transition:background .08s,color .15s}
.script.singing .kw.past{opacity:.55}
.script .kw.on{background:var(--you);color:#fff;box-shadow:0 0 0 3px var(--you)}
.script .kw.on strong{color:#fff}
@media (prefers-reduced-motion:reduce){.script .kw{transition:none}}
.notes li .demo{margin-left:8px;padding:2px 10px}
.script .kw.focus{outline:2px dashed var(--bad);outline-offset:3px}
/* studio layout: chart + line left, results + settings right, player bar always visible */
main.wide{max-width:1480px}
.studio2{display:grid;grid-template-columns:minmax(0,1fr);grid-template-areas:"main" "bar" "side";gap:14px;align-items:start}
.st-main{grid-area:main;gap:12px}
.st-side{grid-area:side;display:flex;flex-direction:column;gap:14px;min-width:0}
.transport-bar{grid-area:bar;position:sticky;bottom:10px;z-index:5;display:flex;flex-wrap:wrap;gap:8px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:10px 14px;box-shadow:0 8px 30px rgba(16,22,34,.14)}
.transport-bar .pos{min-width:44px;text-align:center;font-variant-numeric:tabular-nums}
.transport-bar .sep{width:1px;height:28px;background:var(--line);margin:0 4px}
.transport-bar .status{flex-basis:100%;min-height:0}
.transport-bar .status:empty{display:none}
.studio-head{align-items:flex-start}
.st-settings summary,.micwrap summary{cursor:pointer;list-style:none;display:flex;gap:4px 8px;align-items:center;flex-wrap:wrap;
  padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--ref-soft);transition:border-color .15s,box-shadow .15s}
.st-settings summary::-webkit-details-marker,.micwrap summary::-webkit-details-marker{display:none}
.st-settings summary:hover,.micwrap summary:hover{border-color:var(--ref);box-shadow:0 0 0 3px color-mix(in srgb,var(--ref) 18%,transparent)}
.st-settings summary:focus-visible,.micwrap summary:focus-visible{outline:2px solid var(--ref);outline-offset:2px}
.st-settings summary::after,.micwrap summary::after{content:"Open ▾";margin-left:auto;font-size:13px;font-weight:700;color:var(--ref);white-space:nowrap}
.st-settings[open]>summary::after,.micwrap[open]>summary::after{content:"Close ▴"}
.st-settings summary .muted{order:3;flex-basis:100%}
.st-settings .toggles{display:flex;flex-direction:column;gap:8px}
.st-settings[open]{gap:12px}
.note.clamp{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;cursor:pointer}
.note.clamp::after{content:""}
@media (min-width:1100px){
  .studio2{grid-template-columns:minmax(0,1.6fr) minmax(330px,1fr);grid-template-areas:"main side" "bar side"}
  .st-side{position:sticky;top:12px;max-height:calc(100vh - 24px);overflow:auto}
  .st-results .scores{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:700px){.transport-bar kbd{display:none}.transport-bar .sep{display:none}}
/* player bar refinements */
@media (max-width:1499px){.transport-bar kbd{display:none}}
.transport-bar .btn{padding:8px 12px}
@media (min-width:1100px){
  .studio2{grid-template-rows:auto 1fr}
  .transport-bar{align-self:start}
}
@media (max-width:1099px){
  .transport-bar{position:fixed;left:0;right:0;bottom:0;border-radius:14px 14px 0 0;padding:8px 10px calc(8px + env(safe-area-inset-bottom));gap:6px;z-index:20}
  main.wide{padding-bottom:150px}
  .transport-bar .btn{padding:7px 10px;font-size:14px}
  .transport-bar .meter{display:none}
}
.sigs{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.sig{display:flex;flex-direction:column;gap:2px;padding:10px 12px;border-radius:10px;background:var(--bg);border-left:3px solid var(--you);flex:1 1 240px}
.l1issues{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:6px}
/* player bar: always fixed at the bottom of the window, on every practice screen */
.transport-bar{position:fixed !important;bottom:12px;left:252px;right:32px;z-index:20;align-self:auto;max-width:1448px}
main.wide{padding-bottom:120px}
@media (max-width:820px){.transport-bar{left:0;right:0;bottom:0;border-radius:14px 14px 0 0}main.wide{padding-bottom:150px}}
@media (min-width:1100px){.st-side{max-height:calc(100vh - 120px)}}
/* text pages: sections as cards in two balanced columns */
.doc-grid{columns:2 440px;column-gap:14px}
.doc-sec{break-inside:avoid;margin-bottom:14px}
.doc-sec h2{margin-bottom:2px}
.doc-sec p,.doc-sec li{max-width:none}
main:focus,main:focus-visible{outline:none}
video::cue{background:transparent;color:#fff;font-family:"Instrument Sans",system-ui,sans-serif;font-size:1.05em}
.btn.danger{background:var(--bad);border-color:var(--bad);color:#fff}
.wipe{border-color:color-mix(in srgb,var(--bad) 40%,var(--line))}