/* Chronos — timetable modernism. Paper, ink, hairlines, one signal red. */
:root {
  --paper: #F7F6F2; --ink: #16181B; --muted: #62676E; --hair: #DCDCD6;
  --panel: #FFFFFF; --red: #C42D2D; --red-ink: #FFFFFF;
  --ok: #1E6E42; --shade: #EDECE6;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Code", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root { --paper: #101114; --ink: #ECEAE4; --muted: #979DA6; --hair: #2A2C31;
          --panel: #17181C; --red: #E05A50; --red-ink: #101114;
          --ok: #55B380; --shade: #1C1E23; }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--paper); color: var(--ink);
  font: 16px/1.6 var(--sans); font-feature-settings: "ss01"; }
main { max-width: 960px; margin: 0 auto; padding: 0 1.4rem 5rem; }

/* nav */
header { border-bottom: 1px solid var(--hair); background: var(--paper);
  position: sticky; top: 0; z-index: 10; }
header nav { max-width: 960px; margin: 0 auto; padding: 0.8rem 1.4rem;
  display: flex; gap: 1.6rem; align-items: baseline; flex-wrap: wrap; }
.brand { font: 600 1rem var(--mono); color: var(--ink); text-decoration: none;
  letter-spacing: -0.02em; }
.brand::after { content: ""; display: inline-block; width: 0.44em; height: 0.44em;
  background: var(--red); margin-left: 0.18em; }
header nav a:not(.brand) { font: 500 0.78rem var(--mono); letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--muted); text-decoration: none; }
header nav a:not(.brand):hover { color: var(--ink); }
header nav .right { margin-left: auto; }

/* type */
h1 { font: 600 2.1rem/1.2 var(--sans); letter-spacing: -0.025em;
  margin: 2.6rem 0 0.6rem; text-wrap: balance; }
h2 { font: 600 1.3rem/1.3 var(--sans); letter-spacing: -0.015em; margin: 2.6rem 0 0.6rem;
  padding-top: 1.2rem; border-top: 1px solid var(--hair); }
h3 { font: 600 1.02rem var(--sans); margin: 1.6rem 0 0.4rem; }
p { max-width: 68ch; margin: 0.65rem 0; }
.sub { color: var(--muted); font-size: 1.06rem; max-width: 62ch; }
a { color: var(--ink); text-decoration-color: var(--red); text-underline-offset: 2px; }
a:hover { color: var(--red); }
.eyebrow { font: 500 0.72rem var(--mono); letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--red); }
:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }

/* code */
code { font: 0.86em var(--mono); background: var(--shade); padding: 0.08em 0.32em; }
pre { background: var(--panel); border: 1px solid var(--hair); padding: 0.95rem 1.1rem;
  overflow-x: auto; line-height: 1.55; margin: 0.9rem 0; }
pre code { background: none; padding: 0; font-size: 0.84rem; }

/* tables — the timetable look */
table { border-collapse: collapse; width: 100%; margin: 1rem 0 1.5rem; font-size: 0.92rem; }
th { text-align: left; font: 500 0.72rem var(--mono); letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--muted);
  padding: 0.45rem 0.9rem 0.45rem 0; border-bottom: 2px solid var(--ink); }
td { padding: 0.5rem 0.9rem 0.5rem 0; border-bottom: 1px solid var(--hair);
  vertical-align: top; }
td:first-child:is(.d, .n *), .n { font-family: var(--mono);
  font-variant-numeric: tabular-nums; }
.tablewrap { overflow-x: auto; }

/* actions */
.btn { display: inline-block; background: var(--red); color: var(--red-ink);
  font: 600 0.92rem var(--sans); padding: 0.6rem 1.25rem; border: none;
  text-decoration: none; cursor: pointer; }
.btn:hover { filter: brightness(0.92); color: var(--red-ink); }
.btn.ghost { background: transparent; color: var(--ink);
  border: 1px solid var(--ink); }
.btn.ghost:hover { border-color: var(--red); color: var(--red); filter: none; }

/* panels & tools */
.tool { background: var(--panel); border: 1px solid var(--hair); padding: 1.3rem 1.4rem;
  margin: 1.4rem 0; }
.tool label { display: block; margin: 0.7rem 0 0.25rem;
  font: 500 0.72rem var(--mono); letter-spacing: 0.09em; text-transform: uppercase;
  color: var(--muted); }
.tool input, .tool select { font: 0.95rem var(--mono); padding: 0.5rem 0.6rem;
  border: 1px solid var(--hair); background: var(--paper); color: var(--ink);
  min-width: 12rem; }
.tool input:focus, .tool select:focus { border-color: var(--red); outline: none; }
.result { margin-top: 1rem; font: 1.05rem var(--mono); min-height: 1.6em; }
.result .ok { color: var(--ok); font-weight: 600; }
.result .bad { color: var(--red); font-weight: 600; }
.note { font-size: 0.9rem; color: var(--muted); max-width: 68ch; }

/* cards -> ruled list items, not rounded boxes */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 0 2.2rem; margin: 1.4rem 0; }
.card { border-top: 2px solid var(--ink); padding: 0.8rem 0 1.2rem; }
.card h3 { margin: 0 0 0.3rem; font-family: var(--mono); font-weight: 600; }
.card p { font-size: 0.93rem; margin: 0.3rem 0; }
.card .price { font: 600 1.9rem var(--mono); font-variant-numeric: tabular-nums;
  margin: 0.4rem 0 0.1rem; }
.card .per { color: var(--muted); font: 0.8rem var(--mono); }

/* calendar hero */
.cal { background: var(--panel); border: 1px solid var(--hair); padding: 1.1rem 1.2rem;
  max-width: 26rem; }
.cal-head { display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 0.7rem; }
.cal-head .m { font: 600 0.95rem var(--mono); }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px;
  font: 0.82rem var(--mono); font-variant-numeric: tabular-nums; }
.cal-grid .dow { color: var(--muted); font-size: 0.68rem; text-transform: uppercase;
  letter-spacing: 0.06em; padding: 0.2rem 0; text-align: center; }
.cal-grid .day { text-align: center; padding: 0.34rem 0; }
.cal-grid .wknd { color: var(--muted); background: var(--shade); }
.cal-grid .hol { background: var(--red); color: var(--red-ink); font-weight: 600; }
.cal-grid .today { outline: 2px solid var(--ink); outline-offset: -2px; }
.cal-legend { display: flex; gap: 1.2rem; margin-top: 0.8rem;
  font: 0.72rem var(--mono); color: var(--muted); }
.cal-legend i { display: inline-block; width: 0.7em; height: 0.7em; margin-right: 0.35em; }

/* docs layout */
.docwrap { display: grid; grid-template-columns: 13rem 1fr; gap: 2.5rem; }
.docnav { position: sticky; top: 4rem; align-self: start; font: 0.82rem var(--mono);
  border-right: 1px solid var(--hair); padding-right: 1.2rem; }
.docnav a { display: block; color: var(--muted); text-decoration: none; padding: 0.22rem 0; }
.docnav a:hover { color: var(--red); }
.docnav .grp { font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink); margin: 1rem 0 0.3rem; font-weight: 600; }
@media (max-width: 760px) { .docwrap { grid-template-columns: 1fr; } .docnav { display: none; } }

/* language tabs */
.langs { margin: 0.9rem 0 1.4rem; }
.langs .tabs { display: flex; gap: 0; border-bottom: 1px solid var(--hair); }
.langs .tabs button { font: 500 0.78rem var(--mono); letter-spacing: 0.05em;
  background: none; border: none; border-bottom: 2px solid transparent;
  color: var(--muted); padding: 0.45rem 0.9rem; cursor: pointer; }
.langs .tabs button[aria-selected="true"] { color: var(--ink);
  border-bottom-color: var(--red); }
.langs pre { margin-top: 0; border-top: none; display: none; }
.langs pre.active { display: block; }

/* stat strip */
.stats { display: flex; flex-wrap: wrap; gap: 0 2.5rem; margin: 1.6rem 0;
  border-top: 2px solid var(--ink); }
.stat { padding: 0.7rem 0; }
.stat .v { font: 600 1.6rem var(--mono); font-variant-numeric: tabular-nums; }
.stat .l { font: 0.75rem var(--mono); color: var(--muted); letter-spacing: 0.05em;
  text-transform: uppercase; }

footer { border-top: 1px solid var(--hair); margin-top: 4rem; }
footer > div { max-width: 960px; margin: 0 auto; padding: 1.3rem 1.4rem;
  font: 0.8rem var(--mono); color: var(--muted); display: flex; flex-wrap: wrap;
  gap: 0.4rem 1.8rem; }
footer a { color: var(--muted); }