/* ut5zw: dark lab notebook. JetBrains Mono for structure (UI, headings, labels, diagrams),
   Golos Text for reading. Five signal colours, used to tell parts of a system apart. */
:root {
  --bg: #0b0e13; --panel: #10141b; --panel2: #151a23; --ink: #e6e9ee; --mute: #8a93a3;
  --dim: #4d5565; --line: #252c38;
  --c1: #f2a65a; --c2: #5ea1f7; --c3: #5fd38d; --c4: #f06a5e; --c5: #b08cf6;
  --ui: "JetBrains Mono", ui-monospace, Menlo, monospace;
  --read: "Golos Text", system-ui, sans-serif;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f6f7f9; --panel: #ffffff; --panel2: #eef1f5; --ink: #141820; --mute: #5b6475;
    --dim: #a3abb8; --line: #d9dee6;
    --c1: #c46a12; --c2: #1f66d1; --c3: #18894a; --c4: #c8382c; --c5: #7a4fd0;
    color-scheme: light;
  }
}
:root[data-theme="light"] {
    --bg: #f6f7f9; --panel: #ffffff; --panel2: #eef1f5; --ink: #141820; --mute: #5b6475;
    --dim: #a3abb8; --line: #d9dee6;
    --c1: #c46a12; --c2: #1f66d1; --c3: #18894a; --c4: #c8382c; --c5: #7a4fd0;
    color-scheme: light;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1.0625rem/1.7 var(--read); }
.top, main, footer { max-width: 50rem; margin-inline: auto; padding-inline: 1rem; }
a { color: inherit; text-decoration-color: var(--dim); text-underline-offset: .22em; }
a:hover { color: var(--c1); text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--c1); outline-offset: 2px; border-radius: 2px; }
::selection { background: var(--c1); color: var(--bg); }

/* chrome */
.top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: .5rem 1rem;
  padding-block: 1.1rem; border-bottom: 1px solid var(--line); font: 500 .8rem/1 var(--ui); }
.logo { font-weight: 700; text-decoration: none; color: var(--c1); letter-spacing: .04em; }
.logo::before { content: "~/"; color: var(--dim); }
.top nav { display: flex; flex-wrap: wrap; align-items: center; gap: .3rem 1.2rem; }
.top nav a { text-decoration: none; color: var(--mute); }
.top nav a:hover { color: var(--ink); }
.lang { color: var(--c2) !important; }
footer { display: flex; justify-content: space-between; margin-top: 5rem; padding-block: 1.2rem 2.5rem;
  border-top: 1px solid var(--line); color: var(--mute); font: .8rem var(--ui); }

h1, h2, h3, h4 { font-family: var(--ui); line-height: 1.25; letter-spacing: -.01em; }
h1 { font-size: clamp(1.6rem, 4.6vw, 2.4rem); font-weight: 700; margin: 2.2rem 0 .8rem; text-wrap: balance; overflow-wrap: anywhere; }

/* home */
.intro { padding: 2.5rem 0 .5rem; }
.intro h1 { margin: 0 0 1rem; }
.intro h1::after { content: "_"; color: var(--c1); animation: blink 1.1s steps(1) infinite; }
.intro p { max-width: 38rem; margin: 0; color: var(--mute); font-size: 1.1rem; }
.intro-links { display: flex; gap: 1.4rem; margin-top: 1.1rem !important; font: 500 .85rem var(--ui) !important; }
.intro-links a { color: var(--c2); text-decoration: none; }
.intro-links a::before { content: "→ "; color: var(--dim); }
.block { margin-top: 3rem; }
.block h2, .crumb { font: 500 .75rem var(--ui); color: var(--dim); margin: 0 0 .5rem; }
.block h2::before { content: "## "; }
.more { margin: .9rem 0 0; font: .85rem var(--ui); }
.more a { color: var(--c2); text-decoration: none; }

.notes { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.notes li { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; padding: .75rem 0; border-bottom: 1px solid var(--line); }
.notes a { text-decoration: none; font-weight: 500; min-width: 0; overflow-wrap: anywhere; }
.when { flex: none; display: flex; gap: .7rem; align-items: baseline; color: var(--mute); font: .75rem var(--ui); }
.arch { color: var(--c1); }
.topics { list-style: none; margin: 0; padding: 0; columns: 2 14rem; column-gap: 2rem; border-top: 1px solid var(--line); }
.topics li { display: flex; justify-content: space-between; align-items: baseline; padding: .55rem 0; border-bottom: 1px solid var(--line); break-inside: avoid; }
.topics a { text-decoration: none; }
.topics span { color: var(--dim); font: .75rem var(--ui); }
.crumb { margin: 2.2rem 0 -.5rem; }

/* article */
.meta { display: flex; flex-wrap: wrap; gap: .2rem 1.4rem; color: var(--mute); font: .78rem var(--ui); margin: 0 0 1.4rem; }
.note { margin: 0 0 1rem; padding: .55rem .9rem; border: 1px solid var(--line); border-left: 3px solid var(--c1);
  background: var(--panel); font: .8rem var(--ui); color: var(--mute); }
.note:empty { display: none; }
.prose { margin-top: 1.8rem; }
.prose > p, .prose > ul, .prose > ol, .prose > blockquote { max-width: 40rem; }
.prose h2 { font-size: 1.3rem; margin: 3.2rem 0 .8rem; }
.prose h2::before { content: "## "; color: var(--c1); }
.prose h3 { font-size: 1.05rem; margin: 2.2rem 0 .5rem; color: var(--mute); }
.prose a { color: var(--c2); text-decoration-color: color-mix(in srgb, var(--c2) 40%, transparent); }
.prose strong { color: var(--ink); font-weight: 600; }
.prose li::marker { color: var(--dim); }
.prose img, .prose video { display: block; max-width: 100%; height: auto; margin: 1.5rem auto; border-radius: 4px; border: 1px solid var(--line); }
.prose pre { background: var(--panel) !important; border: 1px solid var(--line); color: var(--ink); padding: 1rem 1.1rem;
  border-radius: 6px; overflow-x: auto; font: .78rem/1.6 var(--ui); }
.prose code { font-family: var(--ui); font-size: .84em; }
.prose :not(pre) > code { color: var(--c1); background: var(--panel2); padding: .1em .35em; border-radius: 3px; }
.prose blockquote { margin: 1.5rem 0; padding: .2rem 1rem; border-left: 3px solid var(--c2); color: var(--mute); }
.prose table { border-collapse: collapse; display: block; overflow-x: auto; font: .82rem/1.55 var(--ui); margin: 1.5rem 0; }
.prose th, .prose td { border-bottom: 1px solid var(--line); padding: .5rem .8rem; text-align: left; vertical-align: top; }
.prose th { color: var(--mute); font-weight: 500; }
.tags { display: flex; flex-wrap: wrap; gap: .5rem; margin: 3rem 0 0; font: .75rem var(--ui); }
.tags a { padding: .15rem .55rem; border: 1px solid var(--line); border-radius: 3px; text-decoration: none; color: var(--mute); }
.tags a::before { content: "#"; color: var(--dim); }

/* ── post components (see WRITING.md "Візуальна мова") ── */
.k1 { --k: var(--c1); } .k2 { --k: var(--c2); } .k3 { --k: var(--c3); } .k4 { --k: var(--c4); } .k5 { --k: var(--c5); }

/* window: shared frame for .fig and .term */
.fig, .term { margin: 2rem 0; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.fig > .bar, .term > .bar { display: flex; align-items: center; gap: .4rem; padding: .5rem .8rem; border-bottom: 1px solid var(--line); font: .7rem var(--ui); color: var(--dim); }
.bar::before { content: "● ● ●"; letter-spacing: .1em; margin-right: .6rem; color: var(--line); }
.fig svg { display: block; width: 100%; height: auto; padding: 1rem; }
.fig figcaption { padding: 0 1rem 1rem; text-align: center; font: .78rem var(--ui); color: var(--mute); }

/* svg vocabulary: .b box, .e edge, .flow animated edge, .lbl / .sub text */
.fig svg text { font-family: var(--ui); font-size: 12px; fill: var(--ink); }
.fig svg .sub { fill: var(--mute); font-size: 10.5px; }
.fig svg .lbl { fill: var(--mute); font-size: 10.5px; }
.fig svg .b { fill: var(--panel2); stroke: var(--k, var(--dim)); stroke-width: 1.2; rx: 4; }
.fig svg .b.solid { fill: var(--k); }
.fig svg .solid + text, .fig svg text.on { fill: var(--bg); font-weight: 700; }
.fig svg .e { fill: none; stroke: var(--k, var(--dim)); stroke-width: 1.3; marker-end: url(#arrow); }
.fig svg .flow { stroke-dasharray: 5 5; animation: flow 1.2s linear infinite; }
.fig svg .pulse { animation: pulse 2s ease-in-out infinite; }
.fig svg marker path { fill: context-stroke; }

/* terminal log: lines appear one by one when scrolled into view */
.term .log { margin: 0; padding: .9rem 1rem; font: .78rem/1.75 var(--ui); overflow-x: auto; }
.term .log p { margin: 0; display: grid; grid-template-columns: 5.5rem 6rem 1fr; gap: .8rem; white-space: nowrap; }
.term .log p > :first-child { color: var(--dim); }
.term .log p > :nth-child(2) { color: var(--k, var(--c2)); }
.term .log .ok { color: var(--c3); } .term .log .no { color: var(--c4); }
.term.play .log p { opacity: 0; transform: translateY(4px); transition: opacity .25s, transform .25s; }
.term.play .log p.in { opacity: 1; transform: none; }
.term .prompt { padding: .6rem 1rem; border-top: 1px solid var(--line); font: .78rem var(--ui); color: var(--c1); }
.term .prompt::after { content: "▍"; animation: blink 1.1s steps(1) infinite; }

/* two or three panels side by side, e.g. before/after */
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 1rem; margin: 2rem 0; }
.card { background: var(--panel); border: 1px solid var(--line); border-top: 2px solid var(--k, var(--dim)); border-radius: 6px; padding: .9rem 1rem; }
.card h4 { margin: 0 0 .4rem; font-size: .8rem; color: var(--k, var(--ink)); }
.card p, .card ul { margin: 0; font-size: .95rem; color: var(--mute); }

/* big number with a short explanation */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); gap: 1px; margin: 2rem 0; background: var(--line); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.stats div { background: var(--panel); padding: 1rem; }
.stats b { display: block; font: 700 1.6rem/1.1 var(--ui); color: var(--k, var(--c1)); }
.stats span { font-size: .85rem; color: var(--mute); }

/* mermaid fallback while it loads */
pre:has(> code.language-mermaid) { color: var(--dim) !important; }
.mermaid-out { margin: 2rem 0; padding: 1rem; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; overflow-x: auto; text-align: center; }

@keyframes blink { 50% { opacity: 0; } }
@keyframes flow { to { stroke-dashoffset: -20; } }
@keyframes pulse { 50% { opacity: .45; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
@media (max-width: 560px) {
  .notes li { flex-direction: column; gap: .15rem; }
  .term .log p { grid-template-columns: 4.5rem 1fr; } .term .log p > :first-child { display: none; }
}

/* ordered sequence of events: a vertical line with dots, last one green */
.steps { list-style: none; margin: 2rem 0; padding: 0 0 0 1.3rem; border-left: 2px solid var(--line); font-size: .95rem; }
.steps li { position: relative; margin: 0 0 .9rem; color: var(--mute); }
.steps li::before { content: ""; position: absolute; left: calc(-1.3rem - 7px); top: .55em; width: 12px; height: 12px; border-radius: 50%; background: var(--panel); border: 2px solid var(--c1); }
.steps li:last-child::before { background: var(--c3); border-color: var(--c3); }
.steps b { color: var(--ink); font-weight: 500; }
/* case card: suspect / evidence / fix */
.case { margin: 2rem 0; padding: .9rem 1.1rem; background: var(--panel); border: 1px solid var(--line); border-left: 3px solid var(--c3); border-radius: 6px; }
.case dl { display: grid; grid-template-columns: max-content 1fr; gap: .35rem 1rem; margin: 0; font-size: .95rem; }
.case dt { font: .75rem/1.9 var(--ui); color: var(--dim); }
.case dd { margin: 0; }
/* terminal output colours, usable in .term pre */
.term pre { margin: 0; padding: .9rem 1rem; font: .76rem/1.65 var(--ui); overflow-x: auto; color: var(--ink); background: none !important; border: 0; }
.term .d { color: var(--dim); } .term .g { color: var(--c3); } .term .r { color: var(--c4); } .term .y { color: var(--c1); } .term .b { color: var(--c2); }

.theme { min-width: 4.6rem; background: none; border: 1px solid var(--line); border-radius: 4px; color: var(--mute); font: .8rem/1 var(--ui); padding: .3rem .45rem; cursor: pointer; }
.theme:hover { color: var(--c1); border-color: var(--c1); }