:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --ink: #111111;
  --mute: #505050;
  --soft: #f1f1f1;
  --btn-bg: #111111;
  --btn-ink: #ffffff;
  --err: #a40000;
  --focus: #0b57d0;
  --pad: clamp(16px, 5vw, 64px);
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --ink: #f4f4f4;
    --mute: #b4b4b4;
    --soft: #1e1e1e;
    --btn-bg: #f4f4f4;
    --btn-ink: #111111;
    --err: #ff9a9a;
    --focus: #8ab4ff;
  }
}

* { box-sizing: border-box; }

html { font-size: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 1rem/1.55 var(--sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; padding-block: 2rem 3rem; }

.wrap {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--pad);
}

.bar { border-bottom: 3px double var(--ink); }
.bar-in { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: baseline; justify-content: space-between; padding-block: 1rem; }
.mark { font: 700 1.25rem/1.2 var(--mono); letter-spacing: .04em; color: var(--ink); text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; font-family: var(--mono); }
nav a, .who { color: var(--ink); }
.who { color: var(--mute); }

.foot { border-top: 3px double var(--ink); padding-block: 1rem; color: var(--mute); }
.foot p { margin: 0; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 .5rem; }
h1 { font-size: 1.75rem; margin-top: 0; }
h2 { font-size: 1.3rem; margin-top: 2.25rem; }
h3 { font-size: 1.1rem; margin-top: 1.5rem; }
p { margin: 0 0 1rem; }
a { color: var(--ink); text-underline-offset: .15em; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.ref, code, .mono { font-family: var(--mono); }
.ref { font-size: 1.5rem; font-weight: 700; letter-spacing: .05em; margin: 0 0 1rem; }
.mute { color: var(--mute); }

.label, label.label, th {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: .04em;
  font-weight: 700;
}

form.stack { display: grid; gap: 1.1rem; }
.field { display: grid; gap: .3rem; }

input[type=text], input[type=email], input[type=search], textarea, select {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: var(--bg);
  border: 2px solid var(--ink);
  border-radius: 0;
  padding: .6rem .75rem;
}
textarea { min-height: 12rem; resize: vertical; }
select { width: auto; max-width: 100%; }

.btn {
  font: 700 1rem/1.2 var(--mono);
  text-transform: uppercase;
  letter-spacing: .04em;
  background: var(--btn-bg);
  color: var(--btn-ink);
  border: 2px solid var(--ink);
  border-radius: 0;
  padding: .65rem 1.1rem;
  cursor: pointer;
}
.btn.alt { background: var(--bg); color: var(--ink); }
.btn:disabled { cursor: progress; opacity: .65; }
.btn[aria-pressed="true"]:disabled { cursor: default; opacity: 1; background: var(--ink); color: var(--bg); }
.row { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }

.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

.note-box { border: 2px solid var(--ink); padding: 1rem; margin-block: 1.5rem; background: var(--soft); }
.note-box p:last-child { margin-bottom: 0; }

#status, .err { min-height: 1.55em; margin: 0; }
.err { color: var(--err); }
.ok { color: var(--ink); }

.scroll { overflow-x: auto; }
table.list { width: 100%; border-collapse: collapse; }
table.list th, table.list td { text-align: left; padding: .6rem .75rem .6rem 0; border-bottom: 1px solid var(--mute); vertical-align: top; }
table.list td.subject { overflow-wrap: anywhere; min-width: 14rem; }

.st { display: inline-block; font: 700 1rem/1.3 var(--mono); text-transform: uppercase; padding: 0 .45rem; border: 2px solid var(--ink); }
.st-open { background: var(--ink); color: var(--bg); }
.st-pending { border-style: dashed; }
.st-closed { background: var(--soft); }
.st-spam { border-style: dotted; text-decoration: line-through; }

.filters { display: flex; flex-wrap: wrap; gap: .75rem 1rem; align-items: end; margin-bottom: 1.5rem; }
.filters .field { min-width: 9rem; }
.pager { display: flex; gap: 1rem; align-items: center; margin-top: 1.25rem; }

.thread { display: grid; gap: 1rem; margin-block: 1.25rem; }
.msg { border: 2px solid var(--ink); padding: .75rem 1rem; }
.msg-out { background: var(--soft); }
.msg-note { border-style: dashed; }
.msg-head { font-family: var(--mono); color: var(--mute); margin-bottom: .5rem; overflow-wrap: anywhere; }
.msg-head b { color: var(--ink); text-transform: uppercase; }
.msg-body { white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; }

.meta { display: grid; grid-template-columns: max-content 1fr; gap: .25rem 1rem; margin-bottom: 1.5rem; }
.meta dt { font-family: var(--mono); text-transform: uppercase; font-weight: 700; }
.meta dd { margin: 0; overflow-wrap: anywhere; }

.tags { display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; margin: 0 0 .75rem; list-style: none; }
.tag { display: inline-flex; gap: .4rem; align-items: center; border: 2px solid var(--ink); padding: 0 .2rem 0 .5rem; font-family: var(--mono); }
.tag button { all: unset; cursor: pointer; padding: .1rem .45rem; font-weight: 700; }
.tag button:focus-visible { outline: 3px solid var(--focus); }

.admin-list { padding: 0; list-style: none; margin: 0 0 1rem; display: grid; gap: .75rem; }
.admin-list li { border: 2px solid var(--ink); padding: .75rem 1rem; display: grid; gap: .5rem; }

@media (max-width: 40rem) {
  .meta { grid-template-columns: 1fr; }
  h1 { font-size: 1.5rem; }
}