/* tekklab - the shared look of every page.
   Layout: dark studio surface, narrow reading column (68ch), graphics and demos at full width.
   Colours are tokens; dark is the default, light via the system setting or the switch. */

@font-face{font-family:"Inter Display";src:url("fonts/InterDisplay-Black.woff") format("woff");font-weight:900;font-style:normal;font-display:swap}
@font-face{font-family:"Inter Display";src:url("fonts/InterDisplay-BlackItalic.woff") format("woff");font-weight:900;font-style:italic;font-display:swap}
@font-face{font-family:"Inter";src:url("fonts/Inter-Regular.woff") format("woff");font-weight:400;font-display:swap}
@font-face{font-family:"Inter";src:url("fonts/Inter-SemiBold.woff") format("woff");font-weight:600;font-display:swap}
@font-face{font-family:"Inter";src:url("fonts/Inter-Bold.woff") format("woff");font-weight:700;font-display:swap}
@font-face{font-family:"DejaVu Sans Mono";src:url("fonts/DejaVuSansMono.woff") format("woff");font-weight:400;font-display:swap}
@font-face{font-family:"DejaVu Sans Mono";src:url("fonts/DejaVuSansMono-Bold.woff") format("woff");font-weight:700;font-display:swap}

:root{
  --bg:#0B0D12; --bg2:#10131A; --surface:#151922; --raise:#1B2029; --line:#262C38; --grid:#1D222C;
  --fg:#EEF1F6; --muted:#9AA3B2; --faint:#46505F;
  --accent:#4D7CFF; --accent-ink:#0B0D12; --accent-soft:rgba(77,124,255,.14);
  --heat:#FF3D7F; --heat-soft:rgba(255,61,127,.14);
  --sub:#4D7CFF; --punch:#22C7A9; --crunch:#FFA53D; --click:#FF4FB8;
  --good:#22C7A9; --warn:#FF5A4F;
  --display:"Inter Display","Arial Black","Helvetica Neue",Arial,sans-serif;
  --body:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"DejaVu Sans Mono",ui-monospace,Menlo,Consolas,monospace;
  --read:68ch; --wide:1120px; --r:10px;
  color-scheme:dark;
}
@media (prefers-color-scheme: light){:root:not([data-theme="dark"]){
  --bg:#F4F5F8; --bg2:#ECEEF3; --surface:#FFFFFF; --raise:#F7F8FB; --line:#D9DDE5; --grid:#E7EAF0;
  --fg:#0F1218; --muted:#545C6B; --faint:#AEB5C2;
  --accent:#2448E0; --accent-ink:#FFFFFF; --accent-soft:rgba(36,72,224,.10);
  --heat:#D81B60; --heat-soft:rgba(216,27,96,.10);
  --sub:#2448E0; --punch:#0B8F7C; --crunch:#C76A00; --click:#C2187A; --good:#0B8F7C; --warn:#C62828;
  color-scheme:light}}
:root[data-theme="light"]{
  --bg:#F4F5F8; --bg2:#ECEEF3; --surface:#FFFFFF; --raise:#F7F8FB; --line:#D9DDE5; --grid:#E7EAF0;
  --fg:#0F1218; --muted:#545C6B; --faint:#AEB5C2;
  --accent:#2448E0; --accent-ink:#FFFFFF; --accent-soft:rgba(36,72,224,.10);
  --heat:#D81B60; --heat-soft:rgba(216,27,96,.10);
  --sub:#2448E0; --punch:#0B8F7C; --crunch:#C76A00; --click:#C2187A; --good:#0B8F7C; --warn:#C62828;
  color-scheme:light}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--body);font-size:17px;line-height:1.6}
img,svg,canvas{max-width:100%}
a{color:var(--accent);text-underline-offset:3px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.gut{padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
.wide{max-width:var(--wide);margin-inline:auto}
.read{max-width:var(--read)}

/* ---------- Header ---------- */
.top{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top .wide{display:flex;align-items:center;gap:20px;min-height:58px;flex-wrap:wrap}
/* "kalvat <name>" like every kalvat project: kalvat in the accent colour, the name in the text colour. */
.brand{font-family:var(--display);font-weight:900;font-style:italic;letter-spacing:-.01em;font-size:20px;color:var(--fg);text-decoration:none;display:flex;align-items:baseline;gap:.3em}
.brand .k{color:var(--accent)}
.nav{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
.nav a{color:var(--muted);text-decoration:none;font-weight:600;font-size:15px;padding:6px 10px;border-radius:6px}
.nav a:hover{color:var(--fg);background:var(--raise)}
.nav a[aria-current="page"]{color:var(--fg);background:var(--raise);box-shadow:inset 0 -2px 0 var(--accent)}
.theme{font:inherit;font-size:13px;background:none;border:1px solid var(--line);color:var(--muted);border-radius:6px;padding:5px 10px;cursor:pointer}
.theme:hover{color:var(--fg);border-color:var(--muted)}
.lang{font-family:var(--mono);font-size:13px;font-weight:700;color:var(--muted);text-decoration:none;border:1px solid var(--line);border-radius:6px;padding:4px 8px}
.lang:hover{color:var(--fg);border-color:var(--muted)}

/* ---------- Typo ---------- */
h1,h2,h3,.disp{font-family:var(--display);font-weight:900;font-style:italic;text-transform:uppercase;letter-spacing:-.02em;line-height:.95;margin:0;text-wrap:balance}
h1{font-size:clamp(48px,10vw,124px)}
h2{font-size:clamp(34px,5.6vw,64px)}
h3{font-size:clamp(22px,2.6vw,28px);letter-spacing:-.01em;line-height:1.05}
h4{font-size:17px;margin:0;font-weight:700}
p{margin:0}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.lede{font-size:clamp(18px,2vw,21px);color:var(--muted);max-width:60ch}
.muted{color:var(--muted)}
.v{font-family:var(--mono);font-size:.88em;background:var(--raise);border:1px solid var(--line);padding:0 6px;border-radius:4px;white-space:nowrap}
kbd{font-family:var(--mono);font-size:.85em;background:var(--raise);border:1px solid var(--line);border-bottom-width:2px;padding:1px 6px;border-radius:4px;white-space:nowrap}
.hl{color:var(--accent)}
.heat{color:var(--heat)}

/* ---------- Hero ---------- */
.hero{padding-block:56px 40px;display:flex;flex-direction:column;gap:22px;border-bottom:1px solid var(--line)}
.hero h1 .o{-webkit-text-stroke:2px var(--fg);color:transparent}
.hero .meta{display:flex;flex-wrap:wrap;gap:8px}
.chip{font-family:var(--mono);font-size:12px;padding:4px 10px;border-radius:999px;border:1px solid var(--line);color:var(--muted);background:var(--surface)}
.herostage{margin-top:8px}

/* ---------- Chapters ---------- */
main{display:flex;flex-direction:column}
.ch{padding-block:64px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:26px;scroll-margin-top:70px}
.ch > .wide,.hero > .wide{display:flex;flex-direction:column;gap:26px;width:100%}
.ch-head{display:grid;grid-template-columns:auto 1fr;gap:6px 20px;align-items:end}
.ch-num{font-family:var(--display);font-weight:900;font-style:italic;font-size:clamp(56px,8vw,96px);line-height:.8;color:transparent;-webkit-text-stroke:1.5px var(--faint)}
.ch-head > div{display:flex;flex-direction:column;gap:8px;min-width:0}
.prose{display:flex;flex-direction:column;gap:14px;max-width:var(--read)}
.prose ul,.prose ol{margin:0;padding-left:22px;display:flex;flex-direction:column;gap:6px}

/* "In short" box */
.tldr{border-left:4px solid var(--accent);background:var(--accent-soft);padding:14px 18px;border-radius:0 var(--r) var(--r) 0;max-width:var(--read);display:flex;flex-direction:column;gap:4px}
.tldr b{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
.warnbox{border-left-color:var(--heat);background:var(--heat-soft)}
.warnbox b{color:var(--heat)}

/* Fold-out for details */
details.more{max-width:var(--read);border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
details.more summary{cursor:pointer;padding:12px 16px;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:12px}
details.more summary::-webkit-details-marker{display:none}
details.more summary::after{content:"+";font-family:var(--mono);color:var(--accent);font-size:18px;line-height:1}
details.more[open] summary::after{content:"−"}
details.more > div{padding:0 16px 16px;display:flex;flex-direction:column;gap:10px;color:var(--muted)}
details.more > div b{color:var(--fg)}

/* ---------- Demo panels ---------- */
.demo{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px;display:flex;flex-direction:column;gap:14px;min-width:0}
.demo-top{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.demo-top .eyebrow{color:var(--accent)}
.demo canvas{display:block;width:100%;background:var(--bg2);border-radius:8px}
.h220{height:220px}.h260{height:260px}.h300{height:300px}.h180{height:180px}.h340{height:340px}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:14px}
.controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px 18px}
.ctl{display:flex;flex-direction:column;gap:4px;min-width:0}
.ctl label{display:flex;justify-content:space-between;gap:8px;font-size:14px;font-weight:600}
.ctl output{font-family:var(--mono);font-size:13px;color:var(--accent);font-weight:400;white-space:nowrap}
.ctl small{font-size:12.5px;color:var(--muted);line-height:1.4}
input[type=range]{width:100%;accent-color:var(--accent);height:24px;margin:0}
.btnrow{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.btn{font:inherit;font-size:14px;font-weight:600;border:1px solid var(--line);background:var(--raise);color:var(--fg);border-radius:8px;padding:8px 14px;cursor:pointer}
.btn:hover{border-color:var(--muted)}
a.btn{display:inline-block;text-decoration:none;text-align:center}
.btn[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);min-width:150px}
.readout{display:flex;flex-wrap:wrap;gap:8px 22px;font-family:var(--mono);font-size:13px;color:var(--muted)}
.readout b{color:var(--fg);font-weight:700}
.legend{display:flex;flex-wrap:wrap;gap:14px;font-size:12.5px;font-family:var(--mono);color:var(--muted)}
.legend i{display:inline-block;width:16px;height:3px;vertical-align:middle;margin-right:6px;border-radius:2px}

/* ---------- Plugin cards ---------- */
.plugin{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.25fr);gap:28px;align-items:start}
.plugin .info{display:flex;flex-direction:column;gap:14px;min-width:0}
.plugin .tag{font-family:var(--mono);font-size:12px;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap}
.plugin .tag span{border:1px solid var(--line);padding:2px 8px;border-radius:4px}
.knobs{display:grid;grid-template-columns:auto 1fr;gap:8px 14px;font-size:15px;margin:0}
.knobs dt{font-family:var(--mono);font-size:13px;color:var(--accent);padding-top:2px;white-space:nowrap}
.knobs dd{margin:0;color:var(--muted)}
.knobs dd b{color:var(--fg)}

/* ---------- Mastering chain ---------- */
.chain{display:flex;align-items:stretch;gap:0;flex-wrap:wrap;row-gap:10px}
.node{flex:1 1 140px;min-width:0;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px;display:flex;flex-direction:column;gap:2px;text-decoration:none;color:var(--fg);position:relative}
.node:hover{border-color:var(--accent)}
.node b{font-family:var(--display);font-style:italic;font-weight:900;text-transform:uppercase;font-size:20px;letter-spacing:-.01em}
.node span{font-size:13px;color:var(--muted);line-height:1.35}
.node em{font-style:normal;font-family:var(--mono);font-size:12px;color:var(--accent)}
.node.opt{border-style:dashed}
.wire{flex:0 0 26px;align-self:center;height:4px;border-radius:2px;background:linear-gradient(90deg,var(--line) 0 40%,var(--accent) 40% 60%,var(--line) 60%);background-size:26px 4px;animation:flow 1s linear infinite}
@keyframes flow{from{background-position:-26px 0}to{background-position:26px 0}}

/* ---------- Gain-Budget ---------- */
.budget{display:flex;height:56px;border-radius:10px;overflow:hidden;border:1px solid var(--line)}
.budget > div{display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:13px;font-weight:700;color:#fff;text-align:center;line-height:1.15;padding:0 6px;transform-origin:left;animation:grow .9s cubic-bezier(.2,.8,.2,1) both}
.budget > div:nth-child(2){animation-delay:.15s}.budget > div:nth-child(3){animation-delay:.3s}
@keyframes grow{from{transform:scaleX(.3)}to{transform:scaleX(1)}}

/* ---------- Cards and grids ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px;display:flex;flex-direction:column;gap:8px;min-width:0}
.card .k{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase}
.card.bad{border-left:4px solid var(--heat)}
.card.bad .k{color:var(--heat)}
.card span.d{color:var(--muted);font-size:15px}
.big3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.route{display:flex;flex-direction:column;gap:14px;text-decoration:none;color:var(--fg);background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px;position:relative;overflow:hidden;min-width:0}
.route:hover{border-color:var(--accent)}
.route .n{font-family:var(--display);font-weight:900;font-style:italic;font-size:64px;line-height:.8;color:transparent;-webkit-text-stroke:1.5px var(--accent)}
.route h3{font-size:30px}
.route p{color:var(--muted);font-size:15.5px}
.route .go{font-weight:700;color:var(--accent);margin-top:auto}
.route ul{margin:0;padding-left:18px;color:var(--muted);font-size:14.5px}

/* Table */
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:560px;font-size:15px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:0}
th{font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:400}
td.n{font-family:var(--mono);white-space:nowrap;font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums}

/* Steps */
.steps{display:flex;flex-direction:column;counter-reset:st;max-width:880px}
.step{display:grid;grid-template-columns:64px minmax(0,1fr);gap:4px 18px;padding:20px 0;border-top:1px solid var(--line)}
.step:last-child{border-bottom:1px solid var(--line)}
.step::before{counter-increment:st;content:counter(st,decimal-leading-zero);font-family:var(--display);font-weight:900;font-style:italic;font-size:40px;line-height:1;color:var(--accent)}
.step > div{display:flex;flex-direction:column;gap:6px;min-width:0}
.step .tool{font-family:var(--mono);font-size:12.5px;color:var(--muted)}

/* Checklist */
.check{display:flex;flex-direction:column;max-width:var(--read)}
.check label{display:flex;gap:12px;align-items:flex-start;padding:11px 4px;border-bottom:1px solid var(--line);cursor:pointer}
.check input{width:19px;height:19px;margin-top:3px;accent-color:var(--accent);flex:none}
.check input:checked + span{color:var(--muted);text-decoration:line-through}

/* Glossary */
.gloss{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:0 28px}
.gloss div{padding:12px 0;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:2px}
.gloss dt{font-weight:700}
.gloss dd{margin:0;color:var(--muted);font-size:15px}

/* Table of contents */
.toc{display:flex;flex-wrap:wrap;gap:8px}
.toc a{font-size:14px;text-decoration:none;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:5px 12px;background:var(--surface)}
.toc a:hover{color:var(--fg);border-color:var(--accent)}

/* Electribe signal flow */
.flow{display:flex;flex-wrap:wrap;gap:0;row-gap:10px;align-items:stretch}
.flow button{font:inherit;flex:1 1 120px;min-width:0;text-align:left;cursor:pointer;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 12px;color:var(--fg);display:flex;flex-direction:column;gap:2px}
.flow button b{font-family:var(--display);font-style:italic;font-weight:900;text-transform:uppercase;font-size:18px}
.flow button span{font-size:12.5px;color:var(--muted);font-family:var(--mono)}
.flow button[aria-pressed="true"]{border:2px solid var(--accent);background:var(--accent-soft);padding:9px 11px}
.flowinfo{border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;background:var(--bg2);display:flex;flex-direction:column;gap:8px;min-height:120px}

/* Footer */
.foot{padding-block:40px 56px;color:var(--muted);font-size:14px}
.foot .wide{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.foot a{color:var(--muted)}

@media (max-width:860px){
  .plugin,.split{grid-template-columns:1fr}
  .big3{grid-template-columns:1fr}
  .wire{flex-basis:100%;height:14px;background:none;position:relative}
  .wire::after{content:"↓";position:absolute;left:50%;top:-4px;color:var(--accent);font-size:14px}
}
@media (max-width:560px){
  body{font-size:16px}
  .ch{padding-block:44px}
  .step{grid-template-columns:44px minmax(0,1fr)}
  .step::before{font-size:30px}
  .nav a{padding:6px 7px;font-size:14px}
  /* Two rows: brand, language and theme on top, the menu across the full width below. */
  .top .wide{gap:8px 12px;padding-block:8px}
  .nav{order:3;width:100%;margin-left:-7px}
  .lang{margin-left:auto}
  .ch-head{grid-template-columns:1fr}
  .ch-num{font-size:48px}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .wire,.budget > div{animation:none}
}