/* Gridline — brand: Ink / Paper, surfaces 950 / 900 / 800, Inter + JetBrains Mono
   (tools/make_brand.py, tools/make_readme_art.py). Track colours from the app. */
@font-face{font-family:Inter;src:url(../assets/fonts/Inter-Regular.woff) format("woff");font-weight:400;font-display:swap}
@font-face{font-family:Inter;src:url(../assets/fonts/Inter-SemiBold.woff) format("woff");font-weight:600;font-display:swap}
@font-face{font-family:Inter;src:url(../assets/fonts/Inter-Bold.woff) format("woff");font-weight:700;font-display:swap}
@font-face{font-family:"JetBrains Mono";src:url(../assets/fonts/JetBrainsMono-Regular.woff) format("woff");font-weight:400;font-display:swap}
@font-face{font-family:"JetBrains Mono";src:url(../assets/fonts/JetBrainsMono-Bold.woff) format("woff");font-weight:700;font-display:swap}

:root{
  --s950:#0C0C0C;
  --s900:#141414;
  --s800:#1F1F1F;
  --s700:#2A2A2A;
  --hair:rgba(255,255,255,.08);
  --hair-2:rgba(255,255,255,.14);
  --paper:#FFFFFF;
  --text:#EBEBEB;
  --dim:#9E9E9E;
  --faint:#6E6E6E;
  /* track colours (src/core/MidiImport.cpp) */
  --t-blue:#5A8FD8;--t-coral:#D8775A;--t-green:#6EB55E;--t-amber:#C9A23F;
  --t-purple:#9A6CD0;--t-teal:#4FB3B0;--t-rose:#D0607E;--t-olive:#8C9A5B;
  --sans:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --wrap:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--s950);color:var(--text);font:400 15px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:var(--text);text-decoration-color:var(--hair-2);text-underline-offset:3px}
a:hover{text-decoration-color:var(--paper)}
:focus-visible{outline:2px solid var(--paper);outline-offset:2px;border-radius:3px}
code{font-family:var(--mono);font-size:.86em}
p code,li code{background:var(--s800);border-radius:4px;padding:.08em .38em;color:var(--text)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;z-index:9;background:var(--paper);color:#000;padding:6px 10px;border-radius:4px}
.label{font:400 11.5px/1 var(--mono);letter-spacing:.24em;text-transform:uppercase;color:var(--faint)}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:5;background:rgba(12,12,12,.86);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--hair)}
.topbar .wrap{display:flex;align-items:center;gap:28px;height:58px}
.brand{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--paper);font-weight:700;font-size:20px;letter-spacing:-.025em}
.brand svg{width:26px;height:26px}
.nav{display:flex;gap:22px}
.nav a{font-size:13.5px;color:var(--dim);text-decoration:none}
.nav a:hover{color:var(--paper)}
.topbar .btn{margin-left:auto;padding:9px 14px;font-size:13.5px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;font:600 14.5px/1 var(--sans);text-decoration:none;border-radius:9px;padding:13px 19px;border:1px solid transparent;transition:background .15s,border-color .15s}
.btn svg{width:16px;height:16px;flex:none}
.btn-primary{background:var(--paper);color:#000}
.btn-primary:hover{background:#D9D9D9}
.btn-ghost{background:var(--s800);color:var(--text);border-color:var(--hair)}
.btn-ghost:hover{border-color:var(--hair-2);background:var(--s700)}

/* ---------- hero: artwork rendered by tools/make_readme_art.py ---------- */
.hero{position:relative;min-height:600px;display:flex;align-items:center;overflow:hidden}
.hero-art{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:right center;
  -webkit-mask-image:linear-gradient(#000 70%,transparent);mask-image:linear-gradient(#000 70%,transparent)}
.hero .wrap{position:relative;width:100%;padding-top:96px;padding-bottom:210px}
.lockup{display:flex;align-items:center;gap:20px;margin:0 0 30px}
.lockup svg{width:96px;height:96px;flex:none;color:var(--paper)}
.lockup h1{margin:0;color:var(--paper);font-weight:700;font-size:clamp(60px,8.4vw,108px);line-height:.86;letter-spacing:-.04em;padding-bottom:.1em}
.lede{font-size:clamp(20px,2.1vw,25px);line-height:1.35;color:#C8C8C8;margin:0 0 16px;max-width:31ch;letter-spacing:-.01em}
.hero .label{margin:0 0 34px;word-spacing:.9em}
.ctas{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px}
.platforms{font-size:13.5px;color:var(--faint);margin:0;max-width:44ch}

/* ---------- sections ---------- */
section{padding:112px 0 0;scroll-margin-top:-26px}
.sec-head{margin-bottom:32px;max-width:640px}
.sec-title{font-weight:700;color:var(--paper);font-size:clamp(28px,3.2vw,38px);letter-spacing:-.03em;line-height:1.1;margin:0 0 10px}
.sec-intro{color:var(--dim);max-width:60ch;margin:0;font-size:16px}

/* panels echo the app's docked panels */
.panel{background:var(--s900);border:1px solid var(--hair);border-radius:14px;overflow:hidden}
.panel-head{display:flex;align-items:center;gap:6px;height:42px;padding:0 7px;border-bottom:1px solid var(--hair)}
.panel-head .tab{font:600 13px/1 var(--sans);color:var(--text);background:var(--s800);padding:8px 12px;border-radius:7px}
.panel-head .tab.off{background:none;color:var(--faint);font-weight:400}
.panel-head .doc{margin-left:auto;font:400 12px/1 var(--mono);color:var(--faint);text-decoration:none;padding:7px 9px;border-radius:6px;display:flex;align-items:center;gap:7px}
.panel-head .doc:hover{color:var(--paper);background:var(--s800)}
.panel-head .doc svg{width:13px;height:13px}
.shot{background:#000}
.shot a{display:block;width:100%}

/* workspace */
#workspace{padding-top:0;margin-top:-1px}
.workspace{border-radius:14px;overflow:hidden;border:1px solid var(--hair-2);box-shadow:0 40px 90px -30px #000;margin-top:-140px;position:relative;z-index:1}

/* download: one card per system, the visitor's system first (download.js) */
.oses{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--hair)}
.oses.has-rec{grid-template-columns:repeat(3,1fr)}
.os{background:var(--s900);padding:22px 22px 24px;display:flex;flex-direction:column;gap:14px}
.os-top{display:flex;align-items:center;gap:13px}
.os-icon{width:26px;height:26px;color:var(--paper);flex:none}
.os h3{margin:0;font-size:16px;font-weight:600;color:var(--paper);line-height:1.2}
.os .req{font:400 12px/1.4 var(--mono);color:var(--faint);margin:3px 0 0}
.os-note:empty,.os-go:empty{display:none}
.files{display:grid;gap:6px}
.file{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px;border-radius:9px;background:var(--s800);border:1px solid var(--hair);text-decoration:none;transition:background .15s,border-color .15s}
.file:hover{background:var(--s700);border-color:var(--hair-2)}
.file-main{display:flex;flex-direction:column;gap:2px;min-width:0}
.file-kind{font-size:13.5px;font-weight:600;color:var(--text)}
.file-meta,.file-size{font:400 11.5px/1.3 var(--mono);color:var(--faint);white-space:pre}
.file-size{flex:none}
div.file{cursor:default}
div.file:hover{background:var(--s800);border-color:var(--hair)}
.chips{display:flex;gap:6px;flex:none}
.chip{display:flex;flex-direction:column;align-items:flex-end;gap:1px;padding:6px 9px;border-radius:7px;background:var(--s700);border:1px solid var(--hair);text-decoration:none;transition:background .15s,color .15s}
.chip b{font:600 12px/1.2 var(--sans);color:var(--text)}
.chip span{font:400 10.5px/1.2 var(--mono);color:var(--faint)}
.chip:hover{background:var(--paper)}
.chip:hover b,.chip:hover span{color:#000}
/* the recommended system spans the row */
.os.rec{grid-column:1/-1;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);grid-template-areas:"top files" "note files" "go files";grid-template-rows:auto auto 1fr;gap:10px 48px;align-items:start;padding:32px;background:#171717}
.os.rec .os-top{grid-area:top}
.os.rec .os-icon{width:40px;height:40px}
.os.rec h3{font-size:24px;letter-spacing:-.02em}
.os.rec .os-note{grid-area:note;margin:4px 0 0;color:var(--dim);font-size:14px}
.os.rec .os-go{grid-area:go;margin-top:12px}
.os.rec .files{grid-area:files;align-self:center}
.os.rec.solo{grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"top go" "note go"}
.os.rec.solo .os-go{margin:0;align-self:center}
.btn-big{flex-wrap:wrap;padding:16px 22px;font-size:15.5px;row-gap:6px}
.btn-sub{flex-basis:100%;padding-left:25px;font:400 12px/1 var(--mono);color:#555}
.mobile-note{margin:0;padding:14px 22px;border-bottom:1px solid var(--hair);color:var(--text);font-size:14px;background:#171717}
.mobile-note[hidden]{display:none}
.note{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--hair)}
.note p{margin:0;padding:18px 22px;font-size:13.5px;color:var(--dim)}
.note p+p{border-left:1px solid var(--hair)}
.note strong{color:var(--text);font-weight:600}
.note a{color:var(--text)}

/* features: channel rows, each with its role colour */
.chan{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr}
.chan li{display:grid;grid-template-columns:3px 1fr;gap:0 18px;padding:18px 22px 19px 0;border-bottom:1px solid var(--hair)}
.chan li:nth-child(odd){border-right:1px solid var(--hair)}
.chan li:nth-last-child(-n+2){border-bottom:0}
.chan li::before{content:"";grid-row:1/3;background:var(--c);border-radius:0 2px 2px 0}
.chan h3{margin:0 0 4px;font-size:15px;font-weight:600;color:var(--paper)}
.chan p{margin:0;color:var(--dim);font-size:14px;line-height:1.55}

/* spotlights */
.stack{display:grid;gap:20px}
.spot{display:grid;grid-template-columns:1.4fr 1fr}
.spot.flip{grid-template-columns:1fr 1.4fr}
.spot .shot{border-right:1px solid var(--hair);overflow:hidden}
.spot .shot a{height:100%}
.spot .shot img{width:100%;height:100%;object-fit:cover;object-position:left top}
.spot.flip .shot{order:2;border-right:0;border-left:1px solid var(--hair)}
/* wide screenshots sit on top, copy underneath */
.spot.stacked{grid-template-columns:1fr}
.spot.stacked .shot{border-right:0;border-bottom:1px solid var(--hair)}
.spot.stacked .shot img{height:auto}
.spot.stacked .copy{display:grid;grid-template-columns:1fr 1.25fr;gap:8px 48px;align-items:start}
.spot .copy{padding:28px 30px}
.spot .copy h3{margin:0 0 8px;font-size:22px;letter-spacing:-.02em;color:var(--paper)}
.spot .copy p{margin:0 0 16px;color:var(--dim)}
.spot ul{margin:0;padding:0;list-style:none}
.spot li{position:relative;padding:8px 0 8px 20px;border-top:1px solid var(--hair);font-size:14px;color:var(--dim)}
.spot li::before{content:"";position:absolute;left:0;top:16px;width:8px;height:8px;border-radius:2.5px;background:var(--c)}
.spot li strong{color:var(--text);font-weight:600}

/* gallery: playlist clips with coloured headers */
.clips{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.clip{margin:0;background:var(--s900);border:1px solid var(--hair);border-radius:12px;overflow:hidden;display:flex;flex-direction:column}
.clip .shot{aspect-ratio:16/10;overflow:hidden}
.clip .shot a{height:100%}
.clip .shot img{width:100%;height:100%;object-fit:cover;object-position:left top}
.clip.wide .shot{aspect-ratio:auto}
.clip.wide .shot img,.clip.wide .shot a{height:auto}
.clip-head{display:flex;align-items:center;gap:7px;padding:6px 11px;background:var(--c);color:#111;font:600 12.5px/1 var(--sans)}
.clip-head::before{content:"";border:5px solid transparent;border-top:6px solid currentColor;border-bottom:0;transform:translateY(2px)}
.clip figcaption{flex:1;padding:15px 18px 17px;color:var(--dim);font-size:14px;border-top:1px solid var(--hair)}
.clip figcaption strong{color:var(--text);font-weight:600}
.clip.wide{grid-column:1/-1}

/* code */
.two{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.two .panel{display:flex;flex-direction:column}
.two .full{grid-column:1/-1}
.term{flex:1;background:#0E0E0E;margin:0;padding:20px 22px;overflow-x:auto;font:400 13px/1.75 var(--mono);color:var(--text)}
.term-note{margin:0;padding:14px 22px;border-top:1px solid var(--hair);font-size:13px;color:var(--faint)}
.term .c{color:var(--faint)}

/* docs: the Browser panel's tree */
.tree{list-style:none;margin:0;padding:8px;columns:2;column-gap:8px}
.tree li{break-inside:avoid}
.tree a{display:flex;align-items:baseline;gap:11px;padding:9px 11px;border-radius:8px;text-decoration:none}
.tree a:hover{background:var(--s800)}
.tree svg{width:15px;height:15px;flex:none;color:var(--faint);transform:translateY(2px)}
.tree a:hover svg{color:var(--paper)}
.tree span{font-size:14.5px;color:var(--text)}
.tree small{color:var(--faint);font-size:13px;margin-left:auto;text-align:right}

/* footer and status bar */
.foot{margin-top:110px;border-top:1px solid var(--hair);color:var(--faint);font-size:13.5px}
.foot .wrap{padding-top:30px;padding-bottom:30px;display:grid;grid-template-columns:1fr auto;gap:18px 40px;align-items:start}
.foot p{margin:0;max-width:72ch}
.foot nav{display:flex;gap:20px;flex-wrap:wrap}
.foot nav a{color:var(--dim)}
.status{border-top:1px solid var(--hair);font:400 11.5px/1 var(--mono);color:var(--faint)}
.status .wrap{display:flex;gap:22px;justify-content:space-between;padding-top:12px;padding-bottom:12px}
.status a{color:var(--faint);text-decoration:none}
.status a:hover{color:var(--paper)}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .nav{display:none}
  .oses,.oses.has-rec{grid-template-columns:1fr 1fr}
  .os.rec{grid-template-columns:1fr;grid-template-areas:"top" "note" "go" "files";gap:10px;padding:26px 22px}
  .os.rec .files{margin-top:10px}
  .os.rec.solo{grid-template-areas:"top" "note" "go"}
  .os.rec.solo .os-go{margin-top:12px}
  .spot,.spot.flip{grid-template-columns:1fr}
  .spot .shot,.spot.flip .shot{order:0;border:0;border-bottom:1px solid var(--hair)}
  .spot .shot img{height:auto}
  .spot.stacked .copy{grid-template-columns:1fr}
  .workspace{margin-top:-120px}
}
@media (max-width:720px){
  body{font-size:14.5px}
  .wrap{padding:0 18px}
  .hero{min-height:0;display:block}
  .hero-art{position:static;height:auto;aspect-ratio:16/10;object-position:78% center;-webkit-mask-image:linear-gradient(#000 60%,transparent);mask-image:linear-gradient(#000 60%,transparent)}
  .hero .wrap{padding-top:0;padding-bottom:48px;margin-top:-56px}
  .lockup{gap:13px;margin-bottom:22px}
  .lockup svg{width:60px;height:60px}
  .workspace{margin-top:0}
  #workspace{padding-top:40px}
  section{padding-top:72px}
  .chan,.clips,.two,.note{grid-template-columns:1fr}
  .chan li,.chan li:nth-child(odd){border-right:0;border-bottom:1px solid var(--hair)}
  .chan li:nth-last-child(2){border-bottom:1px solid var(--hair)}
  .chan li:last-child{border-bottom:0}
  .note p+p{border-left:0;border-top:1px solid var(--hair)}
  .tree{columns:1}
  .oses,.oses.has-rec{grid-template-columns:1fr}
  section{scroll-margin-top:6px}
  .foot .wrap{grid-template-columns:1fr}
  .panel-head .tab.off{display:none}
  .hero .label{letter-spacing:.16em;word-spacing:.5em;font-size:10.5px;white-space:nowrap}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}