:root {
  --bg: #ebe8df;
  --panel: #f5f3ec;
  --panel-2: #e2ded2;
  --ink: #171714;
  --mute: #6a675e;
  --line: #c4bfb1;
  --signal: #d9441a;
  --ok: #2e7a4c;
  --warn: #b8800f;
  --inv: #f5f3ec;
  --stripe: #171714;
  --fd: 'Anton', 'Impact', sans-serif;
  --fb: 'Geist', system-ui, sans-serif;
  --fm: 'Geist Mono', ui-monospace, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11110f;
    --panel: #1a1a17;
    --panel-2: #24231f;
    --ink: #ebe6d8;
    --mute: #8e8a7e;
    --line: #36352f;
    --signal: #ff6a3d;
    --ok: #5cba7d;
    --warn: #e3a93a;
    --inv: #11110f;
    --stripe: #11110f;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #11110f; --panel: #1a1a17; --panel-2: #24231f; --ink: #ebe6d8; --mute: #8e8a7e;
  --line: #36352f; --signal: #ff6a3d; --ok: #5cba7d; --warn: #e3a93a; --inv: #11110f; --stripe: #11110f;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.5 var(--fb);
  overflow-x: hidden;
}
.mono { font-family: var(--fm); font-variant-numeric: tabular-nums; }
.maly { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--mute); font-weight: 500; }
code { font-family: var(--fm); font-size: .9em; background: var(--panel-2); padding: 1px 5px; }
b { font-weight: 600; }

/* ---------- hlavička ---------- */
.hlava {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 48px;
  max-width: 1320px;
  margin: 0 auto;
  padding: 56px 40px 48px;
  border-bottom: 1px solid var(--ink);
  align-items: end;
}
.nad { margin: 0 0 30px; font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--mute); }
h1 {
  font: 400 clamp(56px, 9.4vw, 148px)/1.12 var(--fd);
  text-transform: uppercase;
  letter-spacing: -.005em;
  margin: 0 0 28px;
}
.perex { max-width: 34em; margin: 0 0 22px; font-size: 18px; color: var(--ink); }
.meta { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; font-size: 12px; color: var(--mute); }
.ukazka {
  font-weight: 500;
  color: var(--ink);
  padding: 3px 10px 3px 10px;
  border: 1px solid var(--ink);
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    repeating-linear-gradient(-45deg, var(--signal) 0 6px, var(--stripe) 6px 12px) border-box;
  border: 4px solid transparent;
  text-transform: uppercase;
  letter-spacing: .1em;
}

.panel-knob {
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--ink);
  padding: 24px 24px 22px;
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 20px;
  align-items: center;
  position: relative;
}
.panel-knob::before {
  content: 'SEL';
  position: absolute; top: -9px; left: 16px;
  background: var(--bg); padding: 0 6px;
  font: 500 11px var(--fm); letter-spacing: .12em; color: var(--mute);
}
.panel-knob figcaption { display: flex; flex-direction: column; gap: 4px; }
.panel-knob strong { font: 400 34px/1 var(--fd); text-transform: uppercase; }
.duvod { font-size: 14px; line-height: 1.45; color: var(--mute); margin: 0; }

/* ---------- přepínač (knob) ---------- */
.knob { width: 112px; aspect-ratio: 1; flex: none; }
.knob-velky { width: 150px; }
.knob svg { width: 100%; height: 100%; display: block; overflow: visible; }
.k-ring { fill: none; stroke: var(--line); stroke-width: 1; }
.k-tick { stroke: var(--ink); stroke-width: 1.4; }
.k-lab { font: 500 11px var(--fm); fill: var(--mute); text-anchor: middle; dominant-baseline: middle; letter-spacing: .04em; }
.k-lab.on { fill: var(--ink); font-weight: 600; }
.k-lab.vyp.on { fill: var(--signal); }
.k-body { fill: var(--panel-2); stroke: var(--ink); stroke-width: 1.4; }
.k-grip { stroke: var(--line); stroke-width: 1; }
.k-ptr { transition: transform .7s cubic-bezier(.34, 1.56, .64, 1); transform-origin: 60px 60px; }
.k-ptr line { stroke: var(--signal); stroke-width: 3; stroke-linecap: square; }
.k-dot { fill: var(--ink); }
.k-led { fill: var(--line); transition: fill .3s; }
.k-led.on { fill: var(--signal); }

/* ---------- sekce ---------- */
main { max-width: 1320px; margin: 0 auto; padding: 0 40px 80px; }
.sekce {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 40px;
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}
.rail { position: sticky; top: 24px; align-self: start; }
.cislo {
  display: block;
  font: 400 88px/.8 var(--fd);
  color: transparent;
  -webkit-text-stroke: 1.2px var(--ink);
}
.rail h2 { font: 600 15px/1.2 var(--fb); margin: 14px 0 0; text-transform: uppercase; letter-spacing: .06em; }
.vyklad { max-width: 40em; margin: 0 0 28px; font-size: 17px; }

/* ---------- zdroje ---------- */
.zdroje { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; border: 1px solid var(--ink); }
.zdroj { padding: 20px 22px 22px; background: var(--panel); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); min-width: 0; }
.zdroj:nth-child(2n) { border-right: 0; }
.zdroj:nth-last-child(-n+2) { border-bottom: 0; }
.zdroj.aktivni { box-shadow: inset 4px 0 0 var(--signal); }
.zdroj-hlava { display: flex; align-items: baseline; gap: 12px; margin-bottom: 4px; }
.zdroj-id { font: 400 40px/1 var(--fd); }
.zdroj-typ { font: 500 11px var(--fm); text-transform: uppercase; letter-spacing: .1em; color: var(--mute); }
.zdroj-stav { margin-left: auto; font: 500 11px var(--fm); text-transform: uppercase; letter-spacing: .1em; padding: 2px 7px; border: 1px solid currentColor; white-space: nowrap; }
.zdroj-stav.ok { color: var(--ok); }
.zdroj-stav.plne { color: var(--signal); }
.zdroj-stav.nezname { color: var(--mute); }
.zdroj-ucet { font: 400 13px var(--fm); color: var(--mute); margin: 0 0 18px; overflow-wrap: anywhere; }

.metr { margin-top: 14px; }
.metr-hlava { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; font-size: 13px; }
.metr-hlava .hodnota { font: 500 22px/1 var(--fm); font-variant-numeric: tabular-nums; }
.metr-hlava .hodnota small { font-size: 13px; color: var(--mute); }
.metr-pas {
  position: relative;
  height: 18px;
  margin: 20px 0 5px;
  background: var(--panel-2);
}
.metr-plneni {
  position: absolute; inset: 0 auto 0 0;
  background: var(--ok);
  -webkit-mask: repeating-linear-gradient(90deg, #000 0 5px, transparent 5px 7px);
          mask: repeating-linear-gradient(90deg, #000 0 5px, transparent 5px 7px);
  transition: width .5s ease, background-color .3s;
}
.metr-plneni.warn { background: var(--warn); }
.metr-plneni.plne { background: var(--signal); }
.metr-strop { position: absolute; top: -4px; bottom: -4px; width: 2px; background: var(--ink); }
.metr-strop::after { content: attr(data-l); position: absolute; top: -15px; right: 5px; font: 500 9px var(--fm); color: var(--mute); white-space: nowrap; }
.metr-pata { display: flex; justify-content: space-between; gap: 10px; font: 400 12px var(--fm); color: var(--mute); }
.metr-pata .odpocet { color: var(--ink); }

/* ---------- spotřebitelé, události ---------- */
.dvojice { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 40px; margin-top: 40px; }
.dvojice h3 { margin: 0 0 12px; }
.spotrebitele, .udalosti, .postup { list-style: none; margin: 0; padding: 0; }
.spotrebitele li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 16px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}
.spotrebitele li:last-child { border-bottom: 1px solid var(--line); }
.sp-nazev { font-weight: 500; }
.sp-zdroj { font: 400 26px/1 var(--fd); text-align: right; grid-row: span 2; align-self: center; }
.sp-zdroj.zadny { font: 500 11px var(--fm); color: var(--mute); text-transform: uppercase; letter-spacing: .08em; }
.sp-duvod { font-size: 13px; color: var(--mute); }
.udalosti li { font-size: 12.5px; padding: 9px 0; border-top: 1px dashed var(--line); display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: 10px; }
.udalosti time { color: var(--mute); }

/* ---------- diagramy ---------- */
.diagramy { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.diagram { margin: 0; background: var(--panel); border: 1px solid var(--line); padding: 18px 18px 10px; }
.diagram figcaption { margin-bottom: 14px; }
.diagram svg { width: 100%; height: auto; display: block; }
.d-t { font: 400 13px var(--fb); fill: var(--ink); }
.d-m { font: 400 10.5px var(--fm); fill: var(--mute); letter-spacing: .02em; }
.d-c { text-anchor: middle; }
.d-b { font-weight: 600; }
.d-mono { font-family: var(--fm); font-size: 12px; }
.d-inv { fill: var(--inv); }
.d-l { fill: none; stroke: var(--ink); stroke-width: 1.3; }
.d-l-tenka { stroke: var(--mute); stroke-dasharray: 3 3; }
.d-sip { fill: var(--ink); }
.d-start { fill: var(--ink); }
.d-roz { fill: var(--panel); stroke: var(--ink); stroke-width: 1.3; }
.d-box { fill: var(--panel); stroke: var(--ink); stroke-width: 1.3; }
.d-box-sig { stroke: var(--signal); stroke-width: 1.8; }
.d-cil { fill: var(--panel-2); stroke: var(--ink); stroke-width: 1.3; }
.d-cil-a { stroke: var(--signal); stroke-width: 2; }
.d-stop { fill: var(--signal); }
.d-ok { fill: var(--ok); }
.d-pozor { fill: none; stroke: var(--mute); stroke-dasharray: 4 3; }

/* ---------- simulátor ---------- */
.sim { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); border: 1px solid var(--ink); }
.sim-ovladani { background: var(--panel); padding: 8px 22px 22px; border-right: 1px solid var(--ink); }
.sim-ucet { padding: 16px 0 6px; border-bottom: 1px solid var(--line); }
.sim-ucet:last-child { border-bottom: 0; }
.sim-ucet h4 { margin: 0 0 6px; display: flex; gap: 10px; align-items: baseline; font-weight: 500; font-size: 14px; }
.sim-ucet h4 .zdroj-id { font-size: 26px; }
.sim-ucet h4 small { font: 400 12px var(--fm); color: var(--mute); }
.posuvnik { display: grid; grid-template-columns: 96px minmax(0, 1fr) 76px; gap: 12px; align-items: center; padding: 5px 0; font-size: 13px; }
.posuvnik output { font: 500 13px var(--fm); text-align: right; font-variant-numeric: tabular-nums; }
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 28px; background: transparent; margin: 0; }
input[type=range]::-webkit-slider-runnable-track { height: 4px; background: var(--line); }
input[type=range]::-moz-range-track { height: 4px; background: var(--line); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 12px; height: 22px; margin-top: -9px; background: var(--ink); border: 0; border-radius: 0; }
input[type=range]::-moz-range-thumb { width: 12px; height: 22px; background: var(--ink); border: 0; border-radius: 0; }
input[type=range]:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }

.sim-vystup { padding: 22px; display: flex; flex-direction: column; gap: 18px; min-width: 0; }
.vystup-radek { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 18px; align-items: center; }
.vystup-zdroj { display: block; font: 400 30px/1.05 var(--fd); text-transform: uppercase; margin: 2px 0 4px; }
.sim-tlacitka { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  font: 500 14px var(--fb);
  background: var(--signal); color: #fff;
  border: 0; padding: 12px 18px; cursor: pointer;
  box-shadow: 3px 3px 0 var(--ink);
}
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn:disabled { opacity: .5; cursor: default; }
.btn:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.btn-tichy { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.btn-tichy:active { box-shadow: inset 0 0 0 1px var(--ink); }

.tmux { background: #0f0f0d; color: #d9d4c5; border: 1px solid var(--ink); min-width: 0; }
.tmux-lista { display: flex; justify-content: space-between; background: #2f7a4c; color: #0f0f0d; font-size: 11px; padding: 2px 8px; font-weight: 500; }
.tmux-lista.sig { background: #ff6a3d; }
.tmux-obsah { margin: 0; padding: 12px; min-height: 196px; font-size: 12px; line-height: 1.6; white-space: pre-wrap; overflow-wrap: anywhere; }
.tmux-obsah .r { display: block; animation: radek .25s ease both; }
.tmux-obsah .e { color: #ff6a3d; }
.tmux-obsah .h { color: #e3a93a; }
.tmux-obsah .g { color: #5cba7d; }
.tmux-obsah .m { color: #8e8a7e; }
.kurzor { display: inline-block; width: 7px; height: 13px; background: #d9d4c5; vertical-align: -2px; animation: blik 1s steps(1) infinite; }
@keyframes blik { 50% { opacity: 0; } }
@keyframes radek { from { opacity: 0; transform: translateX(-4px); } }

/* ---------- postup ---------- */
.postup { counter-reset: k; border-top: 1px solid var(--ink); }
.postup li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 110px;
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.postup li::before { counter-increment: k; content: counter(k, decimal-leading-zero); font: 400 13px var(--fm); color: var(--mute); }
.postup .krok { font-weight: 500; font-size: 17px; }
.postup .pozn { display: block; font-size: 13px; color: var(--mute); font-weight: 400; }
.postup .st { font: 500 11px var(--fm); text-transform: uppercase; letter-spacing: .1em; text-align: right; }
.postup .st::before { content: ''; display: inline-block; width: 9px; height: 9px; margin-right: 8px; border: 1.4px solid currentColor; vertical-align: 0; }
.postup .hotovo .st { color: var(--ok); }
.postup .hotovo .st::before { background: currentColor; }
.postup .hotovo .krok { text-decoration: line-through; text-decoration-color: var(--mute); }
.postup .bezi .st { color: var(--signal); }
.postup .bezi .st::before { background: linear-gradient(90deg, currentColor 50%, transparent 50%); animation: blik 1.2s steps(1) infinite; }
.postup .ceka .st { color: var(--mute); }
.pata { font-size: 12px; color: var(--mute); margin: 20px 0 0; }

/* ---------- responzivita ---------- */
@media (max-width: 1080px) {
  .hlava { grid-template-columns: 1fr; gap: 32px; }
  .panel-knob { max-width: 460px; }
  .sekce { grid-template-columns: 1fr; gap: 22px; }
  .rail { position: static; display: flex; align-items: flex-end; gap: 14px; }
  .rail h2 { margin: 0 0 4px; }
  .cislo { font-size: 60px; }
  .sim { grid-template-columns: 1fr; }
  .sim-ovladani { border-right: 0; border-bottom: 1px solid var(--ink); }
}
@media (max-width: 720px) {
  .hlava { padding: 32px 16px 32px; }
  main { padding: 0 16px 56px; }
  .sekce { padding: 40px 0; }
  h1 { font-size: clamp(50px, 15vw, 80px); }
  .perex { font-size: 16px; }
  .panel-knob { grid-template-columns: 104px 1fr; padding: 18px 16px; gap: 14px; }
  .knob-velky { width: 104px; }
  .panel-knob strong { font-size: 26px; }
  .zdroje { grid-template-columns: 1fr; }
  .zdroj { border-right: 0; padding: 18px 16px; }
  .zdroj:nth-last-child(-n+2) { border-bottom: 1px solid var(--line); }
  .zdroj:last-child { border-bottom: 0; }
  .dvojice, .diagramy { grid-template-columns: 1fr; gap: 32px; }
  .diagram { padding: 14px 10px 6px; }
  .sim-ovladani { padding: 4px 16px 16px; }
  .sim-vystup { padding: 18px 16px; }
  .posuvnik { grid-template-columns: 78px minmax(0, 1fr) 66px; gap: 8px; font-size: 12px; }
  .vystup-radek { grid-template-columns: 84px minmax(0, 1fr); gap: 14px; }
  .knob { width: 84px; }
  .vystup-zdroj { font-size: 24px; }
  .postup li { grid-template-columns: 30px minmax(0, 1fr); }
  .postup .st { grid-column: 2; text-align: left; }
  .tmux-obsah { font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}