/* Vertep — a woodcut-and-gravure stylesheet in three inks: black, white and orange.
   Paper and ink swap in dark mode; orange stays the rubric colour of the manuscript. */

:root {
  --paper: #fbf6ec;
  --paper-2: #f2e8d5;
  --paper-3: #e9dcc3;
  --ink: #17120f;
  --ink-2: #4b4038;
  --ink-3: #7a6c60;
  --orange: #e8641c;        /* fills, ornaments, rubrics on ink */
  --orange-text: #b2440c;   /* orange that reads as text on paper */
  --on-orange: #17120f;
  --hatch: rgba(23, 18, 15, .16);
  --shadow: 5px 5px 0 var(--ink);
  --shadow-sm: 3px 3px 0 var(--ink);

  --font-display: "Ruslan Display", "IM Fell English", Georgia, serif;
  --font-head: "IM Fell English SC", "IM Fell English", Georgia, serif;
  --font-head-ital: "IM Fell English", Georgia, serif;
  --font-body: "EB Garamond", Garamond, "Iowan Old Style", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --measure: 44rem;
  --gutter: 16px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #15110e;
    --paper-2: #1f1915;
    --paper-3: #2a221c;
    --ink: #f3ead8;
    --ink-2: #d5c8b3;
    --ink-3: #a7978380;
    --orange: #ef7330;
    --orange-text: #f48a4c;
    --on-orange: #15110e;
    --hatch: rgba(243, 234, 216, .12);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #15110e; --paper-2: #1f1915; --paper-3: #2a221c;
  --ink: #f3ead8; --ink-2: #d5c8b3; --ink-3: #a79783;
  --orange: #ef7330; --orange-text: #f48a4c; --on-orange: #15110e;
  --hatch: rgba(243, 234, 216, .12);
  color-scheme: dark;
}

/* ---------- base ---------- */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.15rem;
  line-height: 1.6;
  font-feature-settings: "liga", "onum";
  overflow-x: hidden;
}
img, svg { max-width: 100%; height: auto; }
a { color: var(--orange-text); text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { color: var(--ink); text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; }
::selection { background: var(--orange); color: var(--on-orange); }

h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 400; line-height: 1.15; letter-spacing: .01em; margin: 2.2rem 0 .8rem; }
h1 { font-family: var(--font-display); font-size: clamp(2.2rem, 5vw, 3.4rem); letter-spacing: .03em; margin-top: .5rem; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.1rem); padding-bottom: .3rem; border-bottom: 1px solid var(--ink); box-shadow: 0 3px 0 -1px var(--paper), 0 4px 0 -1px var(--ink); }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.15rem; }
h2 a.anchor, h3 a.anchor { color: inherit; text-decoration: none; }
p, ul, ol, dl, table, pre, blockquote, figure { margin: 0 0 1.1rem; }
ul, ol { padding-left: 1.4rem; }
li { margin: .25rem 0; }
li::marker { color: var(--orange-text); }
strong { font-weight: 600; }
em { font-style: italic; }
hr { border: 0; margin: 2.5rem 0; }

code, kbd, samp { font-family: var(--font-mono); font-size: .82em; font-variant-ligatures: none; font-feature-settings: "liga" 0, "calt" 0; }
:not(pre) > code {
  background: var(--paper-2);
  border: 1px solid var(--paper-3);
  padding: .05em .3em;
  border-radius: 2px;
  overflow-wrap: anywhere;
}
pre {
  background: var(--paper-2);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-sm);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  line-height: 1.5;
  font-size: .95rem;
  tab-size: 2;
  position: relative;
}
pre code { font-size: .82rem; }
pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute; top: -2px; right: -2px;
  background: var(--ink); color: var(--paper);
  font-family: var(--font-head); font-size: .8rem; letter-spacing: .08em;
  padding: .05rem .55rem .15rem;
}
pre.output { background: var(--ink); color: var(--paper); box-shadow: 3px 3px 0 var(--orange); }
pre.output[data-lang]::before { background: var(--orange); color: var(--on-orange); }

table { border-collapse: collapse; width: 100%; font-size: 1rem; display: block; overflow-x: auto; }
th, td { text-align: left; vertical-align: top; padding: .45rem .7rem; border-bottom: 1px solid var(--ink-3); }
th { font-family: var(--font-head); font-weight: 400; font-size: 1.05rem; border-bottom: 2px solid var(--ink); }
tbody tr:nth-child(even) { background: var(--paper-2); }
td code, th code { white-space: nowrap; overflow-wrap: normal; }

blockquote {
  margin-left: 0; padding: .4rem 1.2rem;
  border-left: 4px solid var(--orange);
  font-family: var(--font-head-ital); font-style: italic; font-size: 1.2rem; color: var(--ink-2);
}

.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper); padding: .5rem 1rem; z-index: 10; }
.skip:focus { left: 1rem; }

/* ---------- ornaments ---------- */

/* a rule with the Alatyr star at its centre */
.ornament {
  display: flex; align-items: center; gap: 1rem;
  margin: 2.8rem auto; max-width: 30rem; color: var(--ink);
}
.ornament::before, .ornament::after {
  content: ""; flex: 1; height: 5px;
  border-top: 1px solid currentColor; border-bottom: 2px solid currentColor;
}
.ornament .star-glyph { width: 28px; height: 28px; flex: none; }

.star-glyph { display: inline-block; vertical-align: middle; }

/* hatched surfaces, as cut with a burin */
.hatched { background-image: repeating-linear-gradient(-45deg, var(--hatch) 0 1px, transparent 1px 6px); }
.hatched-dense { background-image: repeating-linear-gradient(-45deg, var(--hatch) 0 1.2px, transparent 1.2px 4px), repeating-linear-gradient(45deg, var(--hatch) 0 1px, transparent 1px 7px); }

/* ---------- masthead ---------- */

.masthead {
  border-bottom: 2px solid var(--ink);
  box-shadow: 0 4px 0 -1px var(--paper), 0 5px 0 -1px var(--ink);
  background: var(--paper);
  position: sticky; top: 0; z-index: 5;
}
.masthead-inner {
  max-width: 76rem; margin: 0 auto; padding: .55rem var(--gutter);
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: .65rem; color: var(--ink); text-decoration: none; margin-right: auto; }
.brand img { width: 46px; height: 46px; }
.brand .wordmark { font-family: var(--font-display); font-size: 1.7rem; letter-spacing: .08em; line-height: 1; }
.brand:hover { color: var(--orange-text); }
.topnav { display: flex; gap: .2rem; flex-wrap: wrap; }
.topnav a {
  font-family: var(--font-head); font-size: 1.12rem; color: var(--ink); text-decoration: none;
  padding: .25rem .7rem; border: 2px solid transparent;
}
.topnav a:hover { border-color: var(--ink); }
.topnav a[aria-current="page"] { background: var(--ink); color: var(--paper); }

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

.hero { border-bottom: 2px solid var(--ink); position: relative; overflow: hidden; }
.hero-inner {
  max-width: 76rem; margin: 0 auto; padding: 3rem var(--gutter) 3.5rem;
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 2.5rem; align-items: center;
}
.hero h1 { font-size: clamp(3rem, 9vw, 6rem); margin: 0; line-height: .95; }
.hero .kicker { font-family: var(--font-head); font-size: 1.15rem; letter-spacing: .14em; color: var(--orange-text); margin: 0 0 .6rem; }
.hero .lede { font-size: clamp(1.2rem, 2.2vw, 1.45rem); line-height: 1.5; max-width: 36rem; margin: 1.2rem 0 1.6rem; }
.hero-art { position: relative; aspect-ratio: 1; max-width: 30rem; width: 100%; justify-self: center; }
.hero-art .rays {
  position: absolute; inset: -6%;
  background: repeating-conic-gradient(from 0deg, var(--orange) 0 4deg, transparent 4deg 12deg);
  -webkit-mask: radial-gradient(circle, #000 0 46%, transparent 70%);
  mask: radial-gradient(circle, #000 0 46%, transparent 70%);
  opacity: .9;
}
.hero-art .disc {
  position: absolute; inset: 14%; border-radius: 50%;
  background: #fbf6ec; border: 3px solid var(--ink);
  box-shadow: 0 0 0 7px var(--paper), 0 0 0 9px var(--ink);
}
.hero-art .goat { position: absolute; inset: 17% 18% 14% 16%; }
.hero-art .goat img { width: 100%; height: 100%; }

.actions { display: flex; flex-wrap: wrap; gap: .8rem; }
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-head); font-size: 1.2rem; text-decoration: none;
  padding: .55rem 1.2rem .65rem; border: 2px solid var(--ink); color: var(--ink); background: var(--paper);
  box-shadow: var(--shadow-sm); transition: transform .08s, box-shadow .08s;
}
.btn:hover { color: var(--ink); transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn.primary { background: var(--orange); color: var(--on-orange); }

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

.band { border-bottom: 2px solid var(--ink); }
.band.ink { background: var(--ink); color: var(--paper); }
.band.ink a { color: var(--orange); }
.band-inner { max-width: 76rem; margin: 0 auto; padding: 3.2rem var(--gutter); }
.band h2 { border: 0; box-shadow: none; margin-top: 0; text-align: center; }
.band .sub { text-align: center; max-width: 40rem; margin: -.3rem auto 2.2rem; color: var(--ink-2); font-size: 1.2rem; }
.band.ink .sub { color: var(--paper-3); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); gap: 1.6rem; }
.card {
  border: 2px solid var(--ink); background: var(--paper); box-shadow: var(--shadow);
  display: flex; flex-direction: column; color: var(--ink);
}
.card-head {
  display: flex; align-items: center; gap: .7rem;
  padding: .7rem 1rem; border-bottom: 2px solid var(--ink);
}
.card-head .num {
  font-family: var(--font-display); font-size: 1.5rem; color: var(--on-orange);
  background: var(--orange); border: 2px solid var(--ink); width: 2.4rem; height: 2.4rem;
  display: grid; place-items: center; flex: none;
}
.card-head h3 { margin: 0; font-size: 1.3rem; }
.card-body { padding: .9rem 1rem 1.1rem; font-size: 1.05rem; flex: 1; }
.card-body p:last-child { margin-bottom: 0; }
a.card { text-decoration: none; transition: transform .08s, box-shadow .08s; }
a.card:hover { transform: translate(-2px, -2px); box-shadow: 7px 7px 0 var(--ink); color: var(--ink); }
a.card .more { font-family: var(--font-head); color: var(--orange-text); }

.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 2.4rem; align-items: start; }
.split > * { min-width: 0; }

/* the woodcut "plate": a framed figure with a caption in small caps */
.plate { border: 2px solid var(--ink); padding: .5rem; background: var(--paper); box-shadow: var(--shadow); margin: 1.8rem 0; }
.plate > .plate-inner { border: 1px solid var(--ink); padding: 1rem; }
.plate figcaption { font-family: var(--font-head); text-align: center; padding: .55rem .5rem .2rem; font-size: 1.02rem; color: var(--ink-2); }
.plate figcaption b { color: var(--orange-text); font-weight: 400; }
.plate svg { display: block; margin: 0 auto; }

/* nota bene */
.nb {
  border: 2px solid var(--ink); background: var(--paper-2); padding: .9rem 1.1rem .9rem 1.1rem;
  margin: 1.5rem 0; position: relative;
}
.nb::before {
  content: "Nota bene"; font-family: var(--font-head); font-size: .95rem; letter-spacing: .06em;
  display: inline-block; background: var(--orange); color: var(--on-orange);
  border: 2px solid var(--ink); padding: 0 .55rem .1rem; margin: -1.6rem 0 .35rem -.2rem; position: relative;
}
.nb.warn::before { content: "Caveat"; background: var(--ink); color: var(--paper); }
.nb > :last-child { margin-bottom: 0; }

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

.docs-layout {
  max-width: 76rem; margin: 0 auto; padding: 0 var(--gutter);
  display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: 3rem;
}
.sidebar { padding: 2rem 0; position: sticky; top: 4.8rem; align-self: start; max-height: calc(100vh - 5rem); overflow-y: auto; }
.sidebar h4 { font-size: 1rem; letter-spacing: .1em; color: var(--orange-text); margin: 1.4rem 0 .4rem; }
.sidebar h4:first-child { margin-top: 0; }
.sidebar ul { list-style: none; padding: 0; margin: 0; border-left: 2px solid var(--ink); }
.sidebar li { margin: 0; }
.sidebar a { display: block; padding: .22rem .8rem; color: var(--ink); text-decoration: none; font-size: 1.04rem; border-left: 4px solid transparent; margin-left: -3px; }
.sidebar a:hover { border-left-color: var(--ink-3); }
.sidebar a[aria-current="page"] { border-left-color: var(--orange); font-weight: 600; background: var(--paper-2); }

.content { padding: 2rem 0 4rem; min-width: 0; max-width: var(--measure); }
.content > h1:first-child { margin-top: 0; }
.content .lede { font-size: 1.3rem; color: var(--ink-2); line-height: 1.5; }
.breadcrumb { font-family: var(--font-head); font-size: 1rem; color: var(--ink-3); margin-bottom: .4rem; }
.breadcrumb a { color: var(--ink-2); text-decoration: none; }
.pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3rem; padding-top: 1.2rem; border-top: 2px solid var(--ink); flex-wrap: wrap; }
.pager a { font-family: var(--font-head); font-size: 1.15rem; text-decoration: none; }

/* ---------- articles ---------- */

.article { max-width: 42rem; margin: 0 auto; padding: 2.5rem var(--gutter) 4rem; }
.article-head { text-align: center; margin-bottom: 2rem; }
.article-head .kicker { font-family: var(--font-head); letter-spacing: .14em; color: var(--orange-text); margin: 0; }
.article-head h1 { margin: .4rem 0 .6rem; font-size: clamp(2.1rem, 5.2vw, 3.2rem); line-height: 1.08; }
.article-head .byline { font-family: var(--font-head-ital); font-style: italic; color: var(--ink-2); }
.article > p:first-of-type::first-letter,
.article .opening::first-letter {
  float: left; font-family: var(--font-display); font-size: 4.6rem; line-height: .8;
  padding: .45rem .55rem .3rem; margin: .3rem .7rem 0 0;
  background: var(--orange); color: var(--on-orange); border: 3px solid var(--ink);
  box-shadow: var(--shadow-sm);
}
.article h2 { text-align: left; }

.article-list { display: grid; gap: 1.8rem; }
.article-card { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: 1.3rem; border: 2px solid var(--ink); box-shadow: var(--shadow); padding: 1.1rem; text-decoration: none; color: var(--ink); background: var(--paper); }
.article-card:hover { color: var(--ink); transform: translate(-2px, -2px); box-shadow: 7px 7px 0 var(--ink); }
.article-card .glyph { border: 2px solid var(--ink); display: grid; place-items: center; aspect-ratio: 1; }
.article-card h3 { margin: 0 0 .3rem; }
.article-card p { margin: 0; color: var(--ink-2); font-size: 1.05rem; }

/* ---------- footer ---------- */

.colophon { background: var(--ink); color: var(--paper); margin-top: 0; }
.colophon-inner { max-width: 76rem; margin: 0 auto; padding: 2.2rem var(--gutter); display: flex; gap: 2rem; flex-wrap: wrap; align-items: center; justify-content: space-between; }
.colophon a { color: var(--orange); }
.colophon .mark { display: flex; align-items: center; gap: .8rem; font-family: var(--font-display); font-size: 1.4rem; letter-spacing: .08em; }
.colophon .mark img { width: 40px; height: 40px; }
.colophon small { font-family: var(--font-head-ital); font-style: italic; font-size: 1rem; color: var(--paper-3); }
:root[data-theme="dark"] .colophon small { color: var(--ink-2); }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; padding-top: 2rem; }
  .hero-art { max-width: 20rem; grid-row: 1; }
  .split { grid-template-columns: 1fr; }
  .docs-layout { grid-template-columns: 1fr; gap: 0; }
  .sidebar { position: static; max-height: none; padding: 1.2rem 0 0; border-bottom: 2px solid var(--ink); }
  .sidebar ul { display: flex; flex-wrap: wrap; border-left: 0; gap: .2rem; }
  .sidebar a { border: 1px solid var(--ink-3); margin: 0; padding: .15rem .55rem; font-size: .98rem; }
  .sidebar a[aria-current="page"] { border-color: var(--orange); }
  .sidebar h4 { margin-top: .9rem; }
}
@media (max-width: 560px) {
  body { font-size: 1.08rem; }
  .brand .wordmark { font-size: 1.4rem; }
  .brand img { width: 38px; height: 38px; }
  .topnav a { padding: .2rem .45rem; font-size: 1.02rem; }
  .article-card { grid-template-columns: 1fr; }
  .article-card .glyph { max-width: 5rem; }
  pre { font-size: .9rem; padding: .8rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}
@media print {
  .masthead, .sidebar, .colophon, .pager { display: none; }
  .docs-layout { display: block; }
  pre { box-shadow: none; }
}