:root {
  color-scheme: light;
  --paper:      #EFF1F2;
  --panel:      #E4E8EA;
  --ink:        #15181B;
  --ink-soft:   #4D565C;
  --ink-faint:  #76828A;
  --rule:       #CFD6D9;
  --indigo:     #2A4374;
  --rust:       #9C4A14;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #101315; --panel: #1A1F22; --ink: #E4E8EA;
    --ink-soft: #A5B0B6; --ink-faint: #76828A; --rule: #2C3337;
    --indigo: #91ABE0; --rust: #D98A4E;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #101315; --panel: #1A1F22; --ink: #E4E8EA;
  --ink-soft: #A5B0B6; --ink-faint: #76828A; --rule: #2C3337;
  --indigo: #91ABE0; --rust: #D98A4E;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
.wrap { max-width: 44rem; margin-inline: auto; padding-inline: 20px; padding-block: 44px 96px; }

h1 { font-size: clamp(2.1rem, 6vw, 3.1rem); line-height: 1.08; font-weight: 500; letter-spacing: -0.015em; text-wrap: balance; margin: 0; }
h2 { font-size: clamp(1.45rem, 3.6vw, 1.8rem); line-height: 1.2; font-weight: 600; letter-spacing: -0.01em; text-wrap: balance; margin: 0; }
h3 { font-size: 1.14rem; font-weight: 600; line-height: 1.3; text-wrap: balance; margin: 0; }
p  { margin: 0; }
a  { color: var(--indigo); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:focus-visible { outline: 2px solid var(--indigo); outline-offset: 3px; }
strong { font-weight: 600; }

.eyebrow { font-family: var(--mono); font-size: 0.72rem; font-weight: 500; letter-spacing: 0.13em; text-transform: uppercase; color: var(--ink-faint); }
code { font-family: var(--mono); font-size: 0.86em; background: var(--panel); padding: 0.1em 0.34em; border-radius: 2px; word-break: break-word; }
pre { margin: 0; background: var(--panel); border-inline-start: 2px solid var(--rule); padding: 0.9rem 1.1rem; overflow-x: auto; font-family: var(--mono); font-size: 0.8rem; line-height: 1.6; }
pre code { background: none; padding: 0; font-size: inherit; }

.stack   { display: flex; flex-direction: column; gap: 1.15rem; }
.stack-s { display: flex; flex-direction: column; gap: 0.6rem; }
section  { display: flex; flex-direction: column; gap: 1.15rem; margin-block-start: 3.4rem; }
section > .head { display: flex; flex-direction: column; gap: 0.4rem; }

.masthead { display: flex; flex-direction: column; gap: 1.3rem; }
.lede { font-size: 1.22rem; line-height: 1.55; color: var(--ink-soft); }
.byline { display: flex; flex-wrap: wrap; gap: 0.5rem 1.4rem; padding-block-start: 1.1rem; border-block-start: 1px solid var(--rule); font-family: var(--mono); font-size: 0.78rem; color: var(--ink-faint); }

nav.top { display: flex; flex-wrap: wrap; gap: 1.2rem; padding-block-end: 1.4rem; border-block-end: 1px solid var(--rule); margin-block-end: 2.4rem; font-family: var(--mono); font-size: 0.78rem; }
nav.top a { color: var(--ink-faint); text-decoration: none; }
nav.top a:hover, nav.top a[aria-current] { color: var(--ink); }

.figures, .terms { display: grid; grid-template-columns: repeat(auto-fit, minmax(7.5rem, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.fig, .term { background: var(--paper); padding: 0.95rem 1rem; display: flex; flex-direction: column; gap: 0.15rem; }
.fig b, .term b { font-family: var(--mono); font-size: 1.3rem; font-weight: 600; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.fig span, .term span { font-family: var(--mono); font-size: 0.7rem; color: var(--ink-faint); line-height: 1.35; }

.trap { border-inline-start: 3px solid var(--rust); padding-inline-start: 1.15rem; display: flex; flex-direction: column; gap: 0.75rem; }
.trap .eyebrow { color: var(--rust); }

.tablewrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th, td { text-align: start; padding: 0.5rem 0.9rem 0.5rem 0; border-block-end: 1px solid var(--rule); vertical-align: baseline; }
th { font-family: var(--mono); font-weight: 500; font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); }
td.v { font-family: var(--mono); font-size: 0.8rem; white-space: nowrap; }

ol.steps { margin: 0; padding: 0; list-style: none; counter-reset: s; display: flex; flex-direction: column; gap: 1.1rem; }
ol.steps li { counter-increment: s; display: grid; grid-template-columns: 1.9rem 1fr; gap: 0.6rem; }
ol.steps li::before { content: counter(s, decimal-leading-zero); font-family: var(--mono); font-size: 0.78rem; font-weight: 600; color: var(--ink-faint); padding-block-start: 0.28em; }

ul.plain { margin: 0; padding-inline-start: 1.1rem; display: flex; flex-direction: column; gap: 0.45rem; }
ul.plain li::marker { color: var(--ink-faint); }
/* Висячий отступ, а не grid: в гриде жирное начало и хвост фразы стали бы
   разными элементами сетки, и текст уехал бы в колонку шириной с тире. */
ul.ticks { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 0.75rem; }
ul.ticks li { position: relative; padding-inline-start: 1.6rem; }
ul.ticks li::before { content: "—"; position: absolute; inset-inline-start: 0; font-family: var(--mono); color: var(--ink-faint); font-size: 0.85rem; }

.closing { margin-block-start: 4rem; padding-block-start: 1.6rem; border-block-start: 1px solid var(--rule); display: flex; flex-direction: column; gap: 0.9rem; }
.closing p { color: var(--ink-soft); font-size: 1rem; }
.foot { margin-block-start: 2.6rem; padding-block-start: 1.4rem; border-block-start: 1px solid var(--rule); color: var(--ink-faint); font-size: 0.9rem; }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }