/* post.cold.fyi - airmail register */
:root {
  --paper: #E8EBEE;       /* cancel-gray paper */
  --mount: #FAFAF7;       /* white mounting board */
  --ink: #18253D;         /* postal navy ink */
  --ink-soft: #4A5670;
  --rule: #B8C0CB;
  --red: #C21F32;         /* airmail red */
  --blue: #1E4C99;        /* airmail blue */
  --focus: #1E4C99;
  --serif: "Source Serif 4", Georgia, serif;
  --cond: "IBM Plex Sans Condensed", "Arial Narrow", sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #121A28;
    --mount: #1B2536;
    --ink: #E4E8EE;
    --ink-soft: #A3AEC0;
    --rule: #33405A;
    --red: #E2475A;
    --blue: #7FA4E6;
    --focus: #9DBBF0;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--serif);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration-color: var(--rule); text-underline-offset: .18em; }
a:hover { text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }
img { display: block; max-width: 100%; height: auto; }

/* The one loud thing: the airmail border */
.airmail {
  height: 12px;
  background: repeating-linear-gradient(-45deg,
    var(--red) 0 14px, var(--mount) 14px 22px,
    var(--blue) 22px 36px, var(--mount) 36px 44px);
}

.mast, main, .foot { width: min(1180px, 100% - 32px); margin-inline: auto; }

.mast {
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
  padding: 1.25rem 0 1rem;
  border-bottom: 1px solid var(--rule);
}
.wordmark {
  font: 600 1.75rem/1 var(--serif);
  letter-spacing: -.01em;
  text-decoration: none;
}
.mast nav { display: flex; gap: 1.25rem; font: 500 .95rem/1 var(--cond); }
.mast nav a { text-decoration: none; }
.mast nav a:hover { text-decoration: underline; }

/* Intro: the address block is the call to action */
.intro {
  display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 3rem; align-items: end;
  padding: 3.5rem 0 3rem;
}
.lede h1 {
  font: 400 clamp(2rem, 4.2vw, 3.25rem)/1.08 var(--serif);
  letter-spacing: -.015em;
  margin: 0 0 1.25rem;
  max-width: 16ch;
}
.lede p { margin: 0; max-width: 58ch; color: var(--ink-soft); }

.address {
  display: flex; flex-direction: column;
  font: 500 1.05rem/1.45 var(--cond);
  font-style: normal;
  background: var(--mount);
  padding: 1.25rem 1.5rem 1.35rem;
  border-left: 4px solid var(--red);
  justify-self: start;
}
.address.big span:not(.to) { font-size: clamp(1.35rem, 2.4vw, 1.75rem); line-height: 1.3; }
.address .to { color: var(--ink-soft); font-weight: 400; font-size: .95rem; margin-bottom: .2rem; }

/* Archive */
.archive { padding-bottom: 4rem; border-top: 1px solid var(--rule); }
.count { font: 400 .95rem/1 var(--cond); color: var(--ink-soft); margin: 1.25rem 0; }
.filter { display: flex; flex-wrap: wrap; gap: .5rem; margin: 0 0 1.5rem; }
.filter button {
  font: 500 .9rem/1 var(--cond);
  color: var(--ink); background: transparent;
  border: 1px solid var(--rule); border-radius: 999px;
  padding: .45rem .85rem; cursor: pointer;
}
.filter button[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 2.5rem 1.75rem; align-items: start;
}
.tile a { display: block; text-decoration: none; }
.mount {
  display: block;
  background: var(--mount);
  padding: 14px;
  aspect-ratio: 4 / 3;
}
.mount img { width: 100%; height: 100%; object-fit: contain; }
.tile a:hover .mount { outline: 1px solid var(--ink); }
.tline { display: flex; justify-content: space-between; gap: .5rem; margin-top: .7rem; font: 500 .85rem/1.2 var(--cond); }
.no { font-variant-numeric: tabular-nums; color: var(--red); }
.kind { color: var(--ink-soft); font-weight: 400; }
.ttitle { display: block; margin-top: .25rem; font: 400 1.02rem/1.35 var(--serif); }
.tmeta { display: block; margin-top: .2rem; font: 400 .88rem/1.3 var(--cond); color: var(--ink-soft); }

.empty { padding: 3rem 0 2rem; }
.empty p { margin: 0; max-width: 46ch; font-style: italic; color: var(--ink-soft); }

/* Entry page */
.entry {
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 3rem; padding: 2.5rem 0 2rem; align-items: start;
}
.plates { display: grid; gap: 1.5rem; position: sticky; top: 1.5rem; }
.plate { margin: 0; background: var(--mount); padding: clamp(14px, 3vw, 32px); }
.plate img { max-height: 78vh; width: auto; margin-inline: auto; }
.plate figcaption { margin-top: .75rem; font: 400 .85rem/1.3 var(--cond); color: var(--ink-soft); }
.no.big { font: 500 1rem/1 var(--cond); margin: 0 0 .75rem; display: flex; gap: .75rem; }
.ledger h1 { font: 400 clamp(1.6rem, 3vw, 2.25rem)/1.15 var(--serif); margin: 0 0 1.5rem; letter-spacing: -.01em; }
.ledger dl { margin: 0; border-top: 1px solid var(--ink); }
.row {
  display: grid; grid-template-columns: 8.5rem minmax(0, 1fr); gap: 1rem;
  padding: .7rem 0; border-bottom: 1px solid var(--rule);
}
.row dt { font: 500 .9rem/1.45 var(--cond); color: var(--ink-soft); }
.row dd { margin: 0; line-height: 1.45; }
.est {
  display: inline-block; margin-left: .45rem;
  font: 500 .75rem/1 var(--cond); color: var(--blue);
  border: 1px solid currentColor; border-radius: 3px; padding: .15rem .3rem;
  vertical-align: .12em;
}
.basis { display: block; margin-top: .2rem; font: 400 .88rem/1.35 var(--cond); color: var(--ink-soft); }
.note { margin-top: 2rem; }
.note h2 { font: 600 .95rem/1 var(--cond); margin: 0 0 .5rem; }
.note p, .note blockquote { margin: 0; max-width: 60ch; }
.note blockquote { border-left: 3px solid var(--rule); padding-left: 1rem; font-style: italic; }
.legend { margin-top: 2rem; font: 400 .85rem/1.4 var(--cond); color: var(--ink-soft); }
.legend .est { margin: 0 .25rem 0 0; }

.pager {
  display: flex; justify-content: space-between; gap: 1rem;
  padding: 1.25rem 0 3rem; border-top: 1px solid var(--rule);
  font: 500 .95rem/1 var(--cond);
}

/* About */
.about { padding: 3rem 0 4rem; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 1.5rem 4rem; align-items: start; }
.about h1 { grid-column: 1 / -1; font: 400 clamp(2rem, 4vw, 3rem)/1.1 var(--serif); margin: 0 0 .5rem; }
.about .address { position: sticky; top: 1.5rem; }
.prose { max-width: 62ch; }
.prose p { margin: 0 0 1rem; }
.prose h2 { font: 600 1.05rem/1.2 var(--cond); margin: 2rem 0 .5rem; }
.prose h2:first-of-type { margin-top: 1.5rem; }

.foot {
  border-top: 1px solid var(--rule);
  padding: 1.5rem 0 3rem;
  font: 400 .9rem/1.5 var(--cond); color: var(--ink-soft);
}
.foot p { margin: 0 0 .4rem; max-width: 70ch; }

@media (max-width: 760px) {
  .intro, .entry, .about { grid-template-columns: 1fr; gap: 2rem; }
  .intro { padding-top: 2.25rem; }
  .plates, .about .address { position: static; }
  .row { grid-template-columns: 6.5rem minmax(0, 1fr); }
  .grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 2rem 1rem; }
  .mount { padding: 8px; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }