/* The one stylesheet of the site. KaTeX brings its own for the mathematics.

   Flat: nothing is rounded and no rule runs under anything. Things are set
   apart by space and by a field of colour, the way a well set page of a
   magazine sets them apart, and the only lines are the ones the mathematics
   draws itself.

   A serif for the text, which is what the magazine was printed in, and a sans
   for everything round it. Both stacks reach a face with Cyrillic and with
   Vietnamese on every system, since the site is read in both.

   The colours are custom properties, so the dark theme is the same rules over
   other values, and it follows the system until the reader picks one. */

:root {
  --bg: #ffffff;
  --surface: #f5f4f0;
  --surface-2: #eae8e2;
  --ink: #17181b;
  --ink-2: #3a3c41;
  --muted: #6b6d74;
  --accent: #c0281f;
  --accent-soft: #fbeceb;
  --link: #1d55c4;
  --link-hover: #133f99;
  --warn-soft: #fdeeea;

  --serif: "Literata", "PT Serif", "Source Serif 4", "Iowan Old Style", Charter, "Noto Serif", Georgia, serif;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --top: 3.5rem;
  --side: 17rem;
  --measure: 44rem;
  color-scheme: light;
}
/* PT Serif and Charter have no Vietnamese, and with them first the stacked
   diacritics of Vietnamese come out of a fallback font one letter at a time. */
:root:lang(vi), [lang="vi"] { --serif: "Literata", "Noto Serif", "Source Serif 4", Georgia, "Times New Roman", serif; }


:root[data-theme="dark"] {
  --bg: #111215;
  --surface: #1a1b1f;
  --surface-2: #25262b;
  --ink: #ebebe7;
  --ink-2: #c9cac6;
  --muted: #9c9ea5;
  --accent: #ff6f61;
  --accent-soft: #2e1a18;
  --link: #8fb1ff;
  --link-hover: #b6ccff;
  --warn-soft: #321b17;
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111215;
    --surface: #1a1b1f;
    --surface-2: #25262b;
    --ink: #ebebe7;
    --ink-2: #c9cac6;
    --muted: #9c9ea5;
    --accent: #ff6f61;
    --accent-soft: #2e1a18;
    --link: #8fb1ff;
    --link-hover: #b6ccff;
    --warn-soft: #321b17;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top) + 1rem); -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 1.0625rem/1.7 var(--serif);
  font-kerning: normal; text-rendering: optimizeLegibility;
  display: flex; flex-direction: column; min-height: 100vh;
}
a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; text-underline-offset: .18em; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.skip { position: absolute; left: -999px; top: 0; }
.skip:focus { left: 1rem; top: .5rem; z-index: 100; background: var(--bg); padding: .4rem .8rem; }
[hidden] { display: none !important; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40; height: var(--top);
  display: flex; align-items: center; gap: .75rem; padding: 0 clamp(.75rem, 2vw, 1.5rem);
  background: var(--surface); font: .9rem/1 var(--sans);
}
.brand { display: flex; align-items: center; gap: .6rem; color: var(--ink); white-space: nowrap; flex: none; }
.brand:hover { text-decoration: none; color: var(--ink); }
.logo {
  display: inline-grid; place-items: center; width: 2rem; height: 2rem;
  background: var(--accent); color: #fff; font: 700 1.15rem/1 var(--serif);
}
.brand-text { font: 600 1.15rem/1 var(--serif); letter-spacing: .01em; }
.primary { display: flex; gap: .1rem; margin-left: .75rem; }
.primary a { color: var(--ink-2); padding: .55rem .7rem; white-space: nowrap; }
.primary a:hover { background: var(--surface-2); text-decoration: none; color: var(--ink); }
.primary a[aria-current] { color: var(--accent); background: var(--bg); }
.find { flex: 1; max-width: 26rem; margin-left: auto; position: relative; }
.find input {
  width: 100%; height: 2.25rem; padding: 0 2.4rem 0 .85rem;
  border: 0; background: var(--bg); color: var(--ink); font: inherit;
}
.find input::placeholder { color: var(--muted); }
.find input:focus { outline: none; box-shadow: inset 0 0 0 2px var(--accent); }
.find kbd { position: absolute; right: .55rem; top: 50%; translate: 0 -50%; }
kbd { font: 500 .72rem/1 var(--mono); color: var(--muted); padding: .22rem .4rem; background: var(--surface-2); }
.langs { display: flex; gap: .1rem; flex: none; }
.langs a, .langs span { padding: .45rem .5rem; font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-2); }
.langs a:hover { background: var(--surface-2); text-decoration: none; color: var(--ink); }
.langs .here { background: var(--accent-soft); color: var(--accent); }
.icon-btn {
  display: inline-grid; place-items: center; width: 2.25rem; height: 2.25rem; flex: none;
  border: 0; padding: 0; background: transparent; color: var(--ink-2); cursor: pointer; font: 1.05rem/1 var(--sans);
}
.icon-btn:hover { background: var(--surface-2); color: var(--ink); }
.icon-btn svg { width: 1.2rem; height: 1.2rem; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: square; }
.menu, .side-btn, .search-btn { display: none; }

/* ---------- the frame ---------- */
.shell { flex: 1; width: 100%; max-width: 84rem; margin: 0 auto; padding: 0 clamp(1rem, 3vw, 2.5rem); display: grid; grid-template-columns: minmax(0, 1fr); }
.shell.has-side { grid-template-columns: var(--side) minmax(0, 1fr); gap: clamp(1.5rem, 3vw, 3.5rem); padding-left: 0; max-width: none; }
main { min-width: 0; padding: 2.25rem 0 5rem; }
.has-side main { max-width: calc(var(--measure) + 8rem); }

.side {
  position: sticky; top: var(--top); height: calc(100vh - var(--top)); overflow-y: auto; overscroll-behavior: contain;
  background: var(--surface); padding: 1.5rem 1rem 3rem 1.25rem;
  font: .86rem/1.45 var(--sans); scrollbar-width: thin;
}
.side-head { display: block; color: var(--ink); margin-bottom: 1rem; }
.side-head:hover { text-decoration: none; color: var(--accent); }
.side-head .eyebrow { margin-bottom: .25rem; }
.side-head .title { display: block; font: 600 1.15rem/1.25 var(--serif); }
.side ol { list-style: none; margin: 0; padding: 0; }
.side li a { display: flex; gap: .6rem; align-items: baseline; padding: .38rem .6rem; color: var(--ink-2); }
.side li a:hover { background: var(--surface-2); text-decoration: none; color: var(--ink); }
.side li a .n { color: var(--muted); font-size: .75rem; font-variant-numeric: tabular-nums; margin-left: auto; flex: none; }
.side li a[aria-current], .side li a.on { background: var(--bg); color: var(--accent); box-shadow: inset 3px 0 0 var(--accent); }
.side .more { display: block; margin-top: 1rem; padding: .5rem .6rem; background: var(--surface-2); color: var(--ink-2); text-align: center; }
.side .more:hover { background: var(--accent-soft); color: var(--accent); text-decoration: none; }

/* ---------- heads ---------- */
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: .2rem; font: .8rem/1.4 var(--sans); color: var(--muted); margin-bottom: 1.75rem; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--accent); }
.crumbs .sep { opacity: .5; margin: 0 .35rem; }
.eyebrow { display: block; font: 600 .72rem/1.4 var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--accent); margin: 0 0 .6rem; }
.eyebrow a { color: inherit; }
h1, h2, h3, h4 { line-height: 1.22; color: var(--ink); font-family: var(--serif); font-weight: 600; }
h1 { font-size: clamp(1.9rem, 3.2vw, 2.6rem); letter-spacing: -.01em; margin: 0 0 .5rem; }
h2 { font-size: 1.45rem; margin: 2.75rem 0 1rem; }
h3 { font-size: 1.2rem; margin: 2rem 0 .6rem; }
.lede { font-size: 1.15rem; color: var(--ink-2); margin: .4rem 0 0; max-width: var(--measure); }
.head { margin-bottom: 2.25rem; }
.meta { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: 1.25rem; font: .8rem/1 var(--sans); }
.chip { display: inline-flex; align-items: center; gap: .35rem; padding: .45rem .65rem; background: var(--surface); color: var(--ink-2); white-space: nowrap; }
a.chip:hover { text-decoration: none; background: var(--accent-soft); color: var(--accent); }
.chip.tag, .tag { font-family: var(--mono); font-weight: 600; letter-spacing: .04em; }
.by { color: var(--ink-2); font: 500 .95rem/1.5 var(--sans); margin-top: .75rem; }
.by a { color: var(--ink-2); }
.by a:hover { color: var(--accent); }

/* ---------- the text ---------- */
.doc { max-width: var(--measure); }
.doc p { margin: 0 0 1.05rem; hyphens: auto; overflow-wrap: break-word; }
.doc h1, .doc h2, .doc h3, .doc h4 { font-weight: 600; }
.doc h2 { font-size: 1.4rem; }
.doc ul, .doc ol { padding-left: 1.4rem; }
.doc li { margin: .2rem 0; }
.doc blockquote { margin: 1.5rem 0; padding: .75rem 1.25rem; background: var(--surface); color: var(--ink-2); }
.doc table { border-collapse: collapse; margin: 1.5rem 0; font-size: .95rem; display: block; overflow-x: auto; }
.doc th, .doc td { padding: .4rem .75rem; text-align: left; vertical-align: top; }
.doc tr:nth-child(odd) td { background: var(--surface); }
.doc th { background: var(--surface-2); font-family: var(--sans); font-size: .85rem; }
.doc hr { border: 0; height: auto; margin: 2.25rem 0; text-align: center; color: var(--muted); }
.doc hr::after { content: "* * *"; letter-spacing: .6em; font-size: .85rem; }
.doc code { font: .88em/1.4 var(--mono); background: var(--surface); padding: .1em .3em; }
.doc pre { background: var(--surface); padding: 1rem 1.25rem; overflow-x: auto; }
.doc pre code { background: none; padding: 0; }
.doc .footnotes { margin-top: 3rem; font-size: .92rem; color: var(--ink-2); }
.katex { font-size: 1.04em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: .35rem 0; margin: 1.1rem 0; }

/* The marks are the reading's record of the shape of the sheet. A figure is
   the one that has to be visible: the corpus holds the magazine's text and none
   of its pictures, and an article that says look at the figure is unreadable if
   the page is silent about where the figure was. */
.mark { color: var(--muted); font: .8rem/1.4 var(--sans); }
.mark.figure { display: inline-block; padding: .3rem .6rem; background: var(--surface); }
.mark.figure::before { content: "Рисунок"; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; font-size: .7rem; margin-right: .5rem; }
:lang(en) .mark.figure::before { content: "Figure"; }
:lang(vi) .mark.figure::before { content: "Hình"; }
.mark.figure:empty::before { margin-right: 0; }
.mark.column, .mark.rubric { display: block; height: .6rem; }
.mark.folio { float: right; margin: .2rem 0 .5rem 1rem; font-size: .72rem; padding: .15rem .45rem; background: var(--surface); }
.mark.folio::before { content: "с. "; }
:lang(en) .mark.folio::before { content: "p. "; }
:lang(vi) .mark.folio::before { content: "tr. "; }

/* A formula KaTeX would not take. The source is shown rather than hidden,
   because the reading failed here and pretending otherwise helps nobody. */
.tex-failed { background: var(--warn-soft); color: var(--ink); font-size: .88em; padding: .05em .3em; }

.notice { max-width: var(--measure); margin: 0 0 2rem; padding: .85rem 1.1rem; background: var(--surface); color: var(--ink-2); font: .88rem/1.5 var(--sans); }
.notice a { font-weight: 600; }

/* ---------- lists ---------- */
.rows { list-style: none; margin: 0; padding: 0; max-width: 54rem; }
.rows li > a, .rows li > .row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .2rem 1.25rem; align-items: baseline; padding: .7rem .85rem; margin: 0 -.85rem; color: var(--ink); }
.rows li > a:hover { background: var(--surface); text-decoration: none; }
.rows li > a:hover .t { color: var(--link); }
.rows .t { font: 500 1.05rem/1.35 var(--serif); }
.rows .n { color: var(--muted); font: .78rem/1.3 var(--sans); white-space: nowrap; font-variant-numeric: tabular-nums; text-align: right; }
.rows .s { grid-column: 1 / -1; color: var(--muted); font: .82rem/1.4 var(--sans); }
.rows .s .r { color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: .06em; font-size: .68rem; margin-right: .5rem; }
.rows li:target > a, .rows li:target > .row { background: var(--accent-soft); }
.rows .alts { grid-column: 1 / -1; display: flex; gap: .3rem; font: .72rem/1 var(--sans); }
.rows .alts a { padding: .3rem .45rem; background: var(--surface-2); color: var(--ink-2); text-transform: uppercase; font-weight: 600; letter-spacing: .05em; }
.rows .alts a:hover { background: var(--accent-soft); color: var(--accent); text-decoration: none; }
.empty { color: var(--muted); font: .95rem/1.5 var(--sans); }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: .75rem; margin: 0; padding: 0; list-style: none; }
.cards a { display: block; height: 100%; padding: 1rem 1.1rem 1.1rem; background: var(--surface); color: var(--ink); }
.cards a:hover { background: var(--accent-soft); text-decoration: none; }
.cards .k { display: block; font: 600 .7rem/1.4 var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--accent); }
.cards .t { display: block; font: 600 1.25rem/1.25 var(--serif); margin: .2rem 0 .35rem; }
.cards .n { display: block; color: var(--muted); font: .8rem/1.4 var(--sans); }
.cards ul { list-style: none; margin: .6rem 0 0; padding: 0; color: var(--ink-2); font: .85rem/1.45 var(--serif); }
.cards ul li { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.letters { display: flex; flex-wrap: wrap; gap: .25rem; margin: 0 0 2rem; font: 600 .85rem/1 var(--sans); position: sticky; top: var(--top); background: var(--bg); padding: .6rem 0; z-index: 5; }
.letters a { display: inline-grid; place-items: center; min-width: 2rem; height: 2rem; padding: 0 .4rem; background: var(--surface); color: var(--ink-2); }
.letters a:hover { background: var(--accent-soft); color: var(--accent); text-decoration: none; }
.group { margin-top: 2.25rem; }
.group > h2 { font: 600 .78rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin: 0 0 .5rem; }

/* ---------- the archive ---------- */
.hero { padding: clamp(1.5rem, 5vw, 3.5rem) 0 2rem; }
.hero h1 { font-size: clamp(2.6rem, 6vw, 4.2rem); letter-spacing: -.02em; margin-bottom: .3rem; }
.hero .lede { font-size: clamp(1.1rem, 1.8vw, 1.3rem); }
.hero .find-big { display: flex; max-width: 36rem; margin-top: 1.75rem; }
.hero .find-big input { flex: 1; height: 3rem; border: 0; padding: 0 1rem; background: var(--surface); color: var(--ink); font: 1rem var(--sans); }
.hero .find-big input:focus { outline: none; box-shadow: inset 0 0 0 2px var(--accent); }
.hero .find-big button { height: 3rem; border: 0; padding: 0 1.25rem; background: var(--accent); color: #fff; font: 600 .9rem var(--sans); cursor: pointer; }
.stats { display: flex; flex-wrap: wrap; gap: .75rem 2.5rem; margin: 2rem 0 0; font-family: var(--sans); }
.stats div { display: flex; flex-direction: column; }
.stats b { font: 600 1.6rem/1.1 var(--serif); color: var(--ink); }
.stats span { font-size: .78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .07em; }
.quick { display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); gap: .75rem; margin: 2.5rem 0 1rem; padding: 0; list-style: none; }
.quick li { display: flex; }
.quick a { display: block; flex: 1; padding: 1rem 1.1rem; background: var(--surface); color: var(--ink); font: 600 1rem/1.3 var(--sans); }
.quick a span { display: block; color: var(--muted); font: 400 .8rem/1.4 var(--sans); margin-top: .25rem; }
.quick a:hover { background: var(--accent-soft); color: var(--accent); text-decoration: none; }

.decade { margin-top: 2.5rem; }
.decade > h2 { font: 600 .78rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin: 0 0 .75rem; }
.years { display: grid; gap: .35rem; }
.year { display: grid; grid-template-columns: 5.5rem minmax(0, 1fr); align-items: center; gap: 1rem; padding: .35rem .5rem; margin: 0 -.5rem; }
.year:hover { background: var(--surface); }
.year > a { font: 600 1.25rem/1 var(--serif); color: var(--ink); font-variant-numeric: tabular-nums; }
.year > a:hover { color: var(--accent); text-decoration: none; }
.tiles { display: flex; flex-wrap: wrap; gap: .3rem; list-style: none; margin: 0; padding: 0; }
.tiles a { display: inline-grid; place-items: center; min-width: 2.35rem; height: 2.35rem; padding: 0 .45rem; background: var(--surface-2); color: var(--ink-2); font: 600 .82rem/1 var(--sans); font-variant-numeric: tabular-nums; }
.tiles a:hover { background: var(--accent); color: #fff; text-decoration: none; }

.langcards { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 1rem; margin: 2.5rem 0; padding: 0; list-style: none; }
.langcards a { display: block; height: 100%; padding: 1.5rem; background: var(--surface); color: var(--ink); }
.langcards a:hover { background: var(--accent-soft); text-decoration: none; }
.langcards .k { display: block; font: 600 .72rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
.langcards .t { display: block; font: 600 1.6rem/1.2 var(--serif); margin: .5rem 0; }
.langcards .d { display: block; color: var(--ink-2); font-size: .98rem; }
.langcards .n { display: block; color: var(--muted); font: .8rem/1.4 var(--sans); margin-top: .9rem; }

/* ---------- the sheets of an issue ---------- */
.sheet { margin: 0 0 3.5rem; max-width: var(--measure); }
.sheet-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: .4rem 1rem; padding: .55rem .85rem; margin: 0 0 1.25rem; background: var(--surface); font: .8rem/1.4 var(--sans); color: var(--muted); }
.sheet-head h2 { margin: 0; font: 600 .95rem/1.3 var(--sans); color: var(--ink); }
.sheet-head h2 a { color: inherit; }
.sheet-head .how { margin-left: auto; }
.sheet:target .sheet-head { background: var(--accent-soft); }

/* ---------- prev and next ---------- */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; margin-top: 3.5rem; max-width: var(--measure); font-family: var(--sans); }
.pager a { display: block; padding: .9rem 1.1rem; background: var(--surface); color: var(--ink); }
.pager a:hover { background: var(--accent-soft); text-decoration: none; }
.pager .l { display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-bottom: .2rem; }
.pager .t { display: block; font: 500 .98rem/1.35 var(--serif); }
.pager .next { grid-column: 2; text-align: right; }

/* ---------- search ---------- */
.search-page .find-big { display: flex; max-width: var(--measure); }
.search-page .find-big input { flex: 1; height: 3rem; border: 0; padding: 0 1rem; background: var(--surface); color: var(--ink); font: 1.05rem var(--sans); }
.search-page .find-big input:focus { outline: none; box-shadow: inset 0 0 0 2px var(--accent); }
.search-status { color: var(--muted); font: .85rem/1.4 var(--sans); margin: 1rem 0; }
mark { background: var(--accent-soft); color: inherit; padding: 0 .05em; }

.lookup { display: flex; max-width: 22rem; margin: 1.5rem 0 2rem; }
.lookup input { flex: 1; height: 2.6rem; border: 0; padding: 0 .9rem; background: var(--surface); color: var(--ink); font: 600 1rem var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.lookup input:focus { outline: none; box-shadow: inset 0 0 0 2px var(--accent); }
.lookup button { height: 2.6rem; border: 0; padding: 0 1rem; background: var(--accent); color: #fff; font: 600 .85rem var(--sans); cursor: pointer; }

/* ---------- foot ---------- */
.foot-note { max-width: var(--measure); margin-top: 3rem; color: var(--muted); font: .8rem/1.5 var(--sans); }
.site-foot { background: var(--surface); padding: 1.75rem clamp(1rem, 3vw, 2.5rem); font: .82rem/1.6 var(--sans); color: var(--muted); }
.site-foot .in { max-width: 84rem; margin: 0 auto; display: flex; flex-wrap: wrap; gap: .75rem 2rem; align-items: baseline; }
.site-foot a { color: var(--ink-2); }
.site-foot .langs-foot { display: flex; gap: 1rem; margin-left: auto; }

/* ---------- narrow screens ---------- */
@media (max-width: 64rem) {
  .shell.has-side { grid-template-columns: minmax(0, 1fr); padding-left: clamp(1rem, 3vw, 2.5rem); }
  .side { position: fixed; left: 0; top: var(--top); bottom: 0; width: min(20rem, 85vw); height: auto; z-index: 30; translate: -100% 0; transition: translate .18s ease; box-shadow: none; }
  body.side-open .side { translate: 0 0; box-shadow: 0 0 0 100vmax rgb(0 0 0 / .35); }
  .side-btn { display: inline-grid; }
}
@media (max-width: 52rem) {
  .primary { position: fixed; left: 0; right: 0; top: var(--top); z-index: 35; flex-direction: column; margin: 0; padding: .5rem; background: var(--surface); display: none; }
  body.nav-open .primary { display: flex; }
  .primary a { padding: .8rem 1rem; }
  .menu { display: inline-grid; }
  .find kbd { display: none; }
  .brand-text { display: none; }
}
@media (max-width: 34rem) {
  body { font-size: 1rem; }
  .find { display: none; }
  .search-btn { display: inline-grid; margin-left: auto; }
  .langs a, .langs span { padding: .45rem .35rem; }
  .year { grid-template-columns: 1fr; gap: .4rem; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; }
  .rows li > a { grid-template-columns: 1fr; }
  .rows .n { text-align: left; }
}
@media print {
  .topbar, .side, .pager, .site-foot, .crumbs { display: none !important; }
  .shell.has-side { grid-template-columns: 1fr; padding: 0; }
  body { font-size: 11pt; }
  a { color: inherit; }
}