:root {
  color-scheme: dark;
  --bg: #0e1116;
  --bg-alt: #131820;
  --surface: #161c25;
  --surface-2: #1b222c;
  --line: #26303c;
  --line-soft: #1e2732;
  --ink: #dbe2ea;
  --ink-strong: #f2f6fa;
  --muted: #8a95a3;
  --accent: #e0a458;
  --accent-ink: #1a1206;
  --accent-soft: rgba(224, 164, 88, 0.14);
  --danger: #e0705f;
  --ok: #6cb98d;
  --sans:
    "Inter", ui-sans-serif, -apple-system, "Segoe UI", "Helvetica Neue", Arial,
    sans-serif;
  --serif:
    "Iowan Old Style", "Palatino Linotype", Palatino, "Charter", Georgia, serif;
  --mono:
    ui-monospace, "SF Mono", SFMono-Regular, "JetBrains Mono", Menlo, Consolas,
    monospace;
  --rail: 300px;
  --radius: 10px;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f7f4ee;
  --bg-alt: #efeade;
  --surface: #fffdf8;
  --surface-2: #f3efe6;
  --line: #ddd5c6;
  --line-soft: #e8e1d4;
  --ink: #262a30;
  --ink-strong: #10131a;
  --muted: #6d6659;
  --accent: #8f5310;
  --accent-ink: #fffaf2;
  --accent-soft: rgba(143, 83, 16, 0.12);
  --danger: #b03a26;
  --ok: #2f7a51;
}

* {
  box-sizing: border-box;
}

/* Без scroll-behavior: smooth — намеренно. Плавная прокрутка ограничена
   по длительности, и на документе в ~80 000 px переход дальше ~20 000 px
   останавливается на полпути: в адресе #p3, на экране принцип 60. */
html {
  scroll-padding-top: 86px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

code,
pre,
kbd {
  font-family: var(--mono);
}

/* ---------- top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 22px;
  height: 60px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--ink-strong);
  white-space: nowrap;
}
.brand span {
  color: var(--accent);
}

.topbar-spacer {
  flex: 1;
}

.search {
  position: relative;
  flex: 0 1 320px;
}
.search input {
  width: 100%;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 14px 7px 32px;
  outline: none;
}
.search input:focus {
  border-color: var(--accent);
}
.search::before {
  content: "⌕";
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-52%);
  color: var(--muted);
  font-size: 15px;
}

.langpick {
  display: flex;
  gap: 2px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
}
.langpick button {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--muted);
  background: none;
  border: 0;
  border-radius: 999px;
  padding: 5px 11px;
  cursor: pointer;
}
.langpick button:hover {
  color: var(--ink-strong);
}
.langpick button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--accent-ink);
}

.iconbtn {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  width: 34px;
  height: 34px;
  cursor: pointer;
  display: grid;
  place-items: center;
}
.iconbtn:hover {
  color: var(--ink-strong);
  border-color: var(--accent);
}

/* ---------- layout ---------- */

.shell {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: 48px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 28px 120px;
}

.rail {
  position: sticky;
  top: 60px;
  align-self: start;
  max-height: calc(100vh - 60px);
  overflow-y: auto;
  padding: 26px 8px 40px 0;
  font-family: var(--sans);
  font-size: 13px;
  scrollbar-width: thin;
}
.rail::-webkit-scrollbar {
  width: 6px;
}
.rail::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 3px;
}

.rail-group {
  margin-bottom: 20px;
}
.rail-group > a {
  display: block;
  color: var(--muted);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  padding: 4px 0 6px;
}
.rail-group > a:hover {
  color: var(--ink-strong);
  text-decoration: none;
}
.rail-group ol {
  list-style: none;
  margin: 0;
  padding: 0 0 0 2px;
  border-left: 1px solid var(--line-soft);
}
.rail-group li a {
  display: flex;
  gap: 8px;
  color: var(--muted);
  padding: 3px 8px 3px 12px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  line-height: 1.35;
}
.rail-group li a:hover {
  color: var(--ink-strong);
  text-decoration: none;
}
.rail-group li a.current {
  color: var(--ink-strong);
  border-left-color: var(--accent);
  background: var(--accent-soft);
}
.rail-num {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  min-width: 18px;
}

.main {
  min-width: 0;
  padding-top: 26px;
}

/* ---------- hero ---------- */

.hero {
  padding: 26px 0 40px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}
.hero .eyebrow {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}
.hero h1 {
  font-family: var(--sans);
  font-size: clamp(30px, 4.6vw, 50px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: var(--ink-strong);
  margin: 14px 0 16px;
  max-width: 20ch;
}
.hero p {
  max-width: 62ch;
  color: var(--muted);
  margin: 0 0 18px;
}
.hero .chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 11px;
  background: var(--surface);
}

/* ---------- sections ---------- */

.section {
  padding-top: 56px;
}
.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 10px;
  margin-bottom: 6px;
  border-bottom: 2px solid var(--accent);
}
.section-head .numeral {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--accent);
}
.section-head h2 {
  font-family: var(--sans);
  font-size: clamp(21px, 2.4vw, 27px);
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--ink-strong);
  margin: 0;
}

/* ---------- principle ---------- */

.principle {
  padding: 30px 0 6px;
  border-bottom: 1px solid var(--line-soft);
}
.principle:last-child {
  border-bottom: 0;
}

.p-head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.p-num {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 6px;
  padding: 5px 8px;
  margin-top: 4px;
  min-width: 32px;
  text-align: center;
}
.principle h3 {
  font-family: var(--sans);
  font-size: 20px;
  line-height: 1.3;
  letter-spacing: -0.015em;
  font-weight: 700;
  color: var(--ink-strong);
  margin: 0;
  flex: 1;
}
.anchor {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--line);
  opacity: 0;
  transition: opacity 0.12s;
  padding-top: 4px;
}
.principle:hover .anchor {
  opacity: 1;
  color: var(--muted);
}

.principle p {
  margin: 12px 0 0;
  max-width: 74ch;
}
.principle > p:first-of-type {
  margin-top: 10px;
}
.principle ul {
  max-width: 74ch;
  padding-left: 20px;
}
.principle li {
  margin: 4px 0;
}

.lede {
  font-size: 17px;
  color: var(--ink);
  border-left: 3px solid var(--accent);
  padding-left: 16px;
  margin-left: 46px !important;
}

.note {
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.55;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin: 16px 0 0;
  max-width: 74ch;
}
.note strong {
  color: var(--ink-strong);
}

/* ---------- tables ---------- */

.subhead {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 40px 0 -18px;
}

.section > .note,
.section-lede {
  margin-top: 18px;
  max-width: 74ch;
}

.tablewrap {
  overflow-x: auto;
  margin: 18px 0 0;
}
table {
  border-collapse: collapse;
  width: 100%;
  min-width: 520px;
  font-family: var(--sans);
  font-size: 14px;
}
th,
td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
th {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}
tbody tr:hover {
  background: var(--surface);
}
td:first-child {
  font-weight: 600;
  color: var(--ink-strong);
  white-space: nowrap;
}
.verdict-weak {
  color: var(--danger);
}
.verdict-ok {
  color: var(--ok);
}

/* ---------- code ---------- */

.code {
  margin: 18px 0 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.langbar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 5px 6px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
  min-height: 38px;
}
.langtab {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  background: none;
  border: 0;
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
}
.langtab:hover {
  color: var(--ink-strong);
  background: var(--accent-soft);
}
.langtab[aria-selected="true"] {
  color: var(--ink-strong);
  background: var(--bg);
  box-shadow: inset 0 0 0 1px var(--line);
}
.langlabel {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 5px 10px;
}
.langbar .grow {
  flex: 1;
}
.copy {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 4px 9px;
  cursor: pointer;
}
.copy:hover {
  color: var(--ink-strong);
  border-color: var(--line);
}

.codepane[hidden] {
  display: none;
}
.code pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.62;
  tab-size: 4;
}
.code pre code {
  background: none;
  padding: 0;
}
.codepane + .codepane {
  border-top: 1px solid var(--line-soft);
}
.paneflag {
  display: none;
}
.code.allmode .paneflag {
  display: block;
}
.codepane > .paneflag {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 8px 18px 0;
}

p code,
li code,
td code {
  font-size: 0.86em;
  background: var(--surface-2);
  border: 1px solid var(--line-soft);
  border-radius: 5px;
  padding: 1px 5px;
}

/* highlight.js theme */
.hljs-comment,
.hljs-quote {
  color: var(--muted);
  font-style: italic;
}
.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-doctag,
.hljs-name {
  color: #c58af9;
}
.hljs-string,
.hljs-regexp,
.hljs-addition,
.hljs-attribute,
.hljs-meta .hljs-string {
  color: #8fce8f;
}
.hljs-number,
.hljs-symbol,
.hljs-bullet {
  color: #e0a458;
}
.hljs-title,
.hljs-title.function_,
.hljs-section {
  color: #79c0ff;
}
.hljs-type,
.hljs-class .hljs-title,
.hljs-title.class_,
.hljs-built_in {
  color: #59d2c4;
}
.hljs-attr,
.hljs-variable,
.hljs-template-variable,
.hljs-selector-attr {
  color: #f0a5b8;
}
.hljs-meta,
.hljs-params {
  color: #a8b3c0;
}
.hljs-deletion {
  color: var(--danger);
}
.hljs-emphasis {
  font-style: italic;
}
.hljs-strong {
  font-weight: 700;
}

html[data-theme="light"] .hljs-keyword,
html[data-theme="light"] .hljs-selector-tag,
html[data-theme="light"] .hljs-literal,
html[data-theme="light"] .hljs-doctag,
html[data-theme="light"] .hljs-name {
  color: #7c3aed;
}
html[data-theme="light"] .hljs-string,
html[data-theme="light"] .hljs-regexp,
html[data-theme="light"] .hljs-addition,
html[data-theme="light"] .hljs-attribute {
  color: #216e3f;
}
html[data-theme="light"] .hljs-number,
html[data-theme="light"] .hljs-symbol {
  color: #a25f14;
}
html[data-theme="light"] .hljs-title,
html[data-theme="light"] .hljs-section {
  color: #0b5cad;
}
html[data-theme="light"] .hljs-type,
html[data-theme="light"] .hljs-title.class_,
html[data-theme="light"] .hljs-built_in {
  color: #0f7268;
}
html[data-theme="light"] .hljs-attr,
html[data-theme="light"] .hljs-variable {
  color: #a03060;
}
html[data-theme="light"] .hljs-meta,
html[data-theme="light"] .hljs-params {
  color: #55606d;
}

/* ---------- misc ---------- */

.closing {
  margin-top: 56px;
  padding: 26px 28px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--accent-soft);
  font-size: 18px;
  color: var(--ink-strong);
}

.footer {
  margin-top: 64px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.railtoggle {
  display: none;
}

#langpick-slot-rail {
  display: none;
}

.empty {
  font-family: var(--sans);
  color: var(--muted);
  padding: 40px 0;
}

@media (max-width: 1080px) {
  .shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding: 0 20px 90px;
  }
  .rail {
    position: static;
    max-height: none;
    padding: 18px 0 8px;
    border-bottom: 1px solid var(--line);
    display: none;
  }
  .rail.open {
    display: block;
  }
  .railtoggle {
    display: grid;
  }
  .search {
    flex: 1 1 140px;
  }
  .brand {
    font-size: 13px;
  }
  body {
    font-size: 16px;
  }
  .lede {
    margin-left: 0 !important;
  }
}

@media (max-width: 620px) {
  .topbar {
    gap: 10px;
    padding: 0 14px;
    height: 56px;
  }
  #langpick-slot-rail {
    display: block;
    padding: 0 0 18px;
  }
  #langpick-slot-rail .langpick {
    width: 100%;
    justify-content: space-between;
  }
  .brand {
    flex: 0 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .search {
    flex: 1 1 90px;
    min-width: 0;
  }
  .topbar-spacer {
    display: none;
  }
  .p-num {
    min-width: 28px;
    padding: 4px 6px;
  }
  .principle h3 {
    font-size: 18px;
  }
}

@media print {
  .topbar,
  .rail,
  .langbar,
  .anchor {
    display: none !important;
  }
  .shell {
    display: block;
    max-width: none;
  }
  .codepane[hidden] {
    display: block !important;
  }
  .paneflag {
    display: block !important;
  }
  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
  }
}

/* ---------- generated-page additions ---------- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skiplink {
  position: absolute;
  left: -9999px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  border-radius: 0 0 8px 0;
}
.skiplink:focus {
  left: 0;
  top: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}
.principle .anchor:focus-visible {
  opacity: 1;
  color: var(--accent);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 12px 0 0 46px;
  padding: 0;
}
.badge {
  display: inline-block;
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--surface);
  cursor: help;
}
.badge-kind {
  color: var(--ink-strong);
  border-color: var(--ink-strong);
}
.badge-established {
  color: var(--ok);
  border-color: color-mix(in srgb, var(--ok) 55%, transparent);
}
.badge-context-dependent {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
}
.badge-opinionated {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 55%, transparent);
}

.caveat,
.versions,
.conflicts-ref,
.sources {
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--muted);
  margin: 10px 0 0 46px;
  max-width: 70ch;
}
.caveat {
  border-left: 2px solid var(--danger);
  padding-left: 12px;
}
.caveat strong,
.versions strong,
.conflicts-ref strong,
.sources strong {
  color: var(--ink-strong);
}

.langbar .status {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 8px;
  margin-right: 6px;
  cursor: help;
}

.fallback-note {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  border-bottom: 1px solid var(--line);
  margin: 0;
  padding: 7px 18px;
}

caption {
  caption-side: top;
  text-align: left;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--muted);
  padding: 0 14px 10px;
}

@media (max-width: 1080px) {
  .meta,
  .caveat,
  .versions,
  .conflicts-ref,
  .sources {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

@media print {
  :root,
  html[data-theme="light"],
  html[data-theme="dark"] {
    --bg: #fff;
    --bg-alt: #fff;
    --surface: #fff;
    --surface-2: #fff;
    --line: #bbb;
    --line-soft: #ddd;
    --ink: #111;
    --ink-strong: #000;
    --muted: #444;
    --accent: #6b4310;
    --accent-soft: transparent;
    --danger: #8a2b1a;
    --ok: #1d5c38;
  }
  .code,
  .code pre,
  .note,
  .badge {
    background: #fff !important;
  }
  .hljs-keyword,
  .hljs-string,
  .hljs-number,
  .hljs-title,
  .hljs-type,
  .hljs-attr,
  .hljs-built_in,
  .hljs-literal,
  .hljs-meta,
  .hljs-params,
  .hljs-name,
  .hljs-section,
  .hljs-symbol,
  .hljs-variable {
    color: #000 !important;
  }
  .hljs-comment {
    color: #555 !important;
  }
  .langbar {
    display: flex !important;
  }
  .langbar .copy,
  .langtab {
    display: none !important;
  }
  .paneflag {
    display: block !important;
  }
  .skiplink,
  .fallback-note {
    display: none !important;
  }
}

/* ссылка в тексте отличается не только цветом — иначе WCAG 1.4.1 */
.principle p a,
.hero p a,
.section-lede a,
td a,
li a:not(.rail-group li a),
caption a {
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

.langtabs {
  display: flex;
  gap: 2px;
}