/* High Honors without JavaScript (P66.9): plain, monochrome, readable. */
:root {
  --paper: #fafafa;
  --card: #ffffff;
  --line: #e5e5e5;
  --muted: #666666;
  --ink: #171717;
  --on-ink: #ffffff;
  --warn: #b42318;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0a0a0a;
    --card: #111111;
    --line: #262626;
    --muted: #a1a1a1;
    --ink: #ededed;
    --on-ink: #0a0a0a;
    --warn: #f97066;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, 'Segoe UI', Roboto, 'Malgun Gothic', sans-serif;
}
a { color: inherit; text-underline-offset: 3px; }
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--card);
}
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; text-decoration: none; }
.brand img { border-radius: 6px; }
.who { font-size: 0.9rem; }
.signout { display: inline; margin: 0; }
.tabs {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding: 8px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--card);
}
.tabs a { padding: 6px 10px; border-radius: 6px; text-decoration: none; white-space: nowrap; }
.tabs a[aria-current='page'] { background: var(--ink); color: var(--on-ink); }
main { max-width: 760px; margin: 0 auto; padding: 16px; }
footer { max-width: 760px; margin: 24px auto; padding: 0 16px 24px; color: var(--muted); font-size: 0.875rem; }
h1 { font-size: 1.6rem; line-height: 1.2; margin: 8px 0 16px; }
h2 { font-size: 1.05rem; margin: 0 0 8px; }
.hero .lead { font-size: 1.2rem; font-weight: 500; margin-top: -8px; }
.card, .day {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 14px 16px;
  margin: 0 0 12px;
}
.day h2 { font-size: 0.95rem; }
.muted { color: var(--muted); }
.notice { border: 1px solid var(--line); border-left: 3px solid var(--ink); border-radius: 6px; padding: 10px 12px; background: var(--card); }
.notice.error { border-left-color: var(--warn); }
.stack { display: grid; gap: 12px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
label { display: grid; gap: 4px; font-weight: 500; }
label.check { display: flex; align-items: center; gap: 8px; font-weight: 400; }
input, textarea, select {
  font: inherit;
  color: inherit;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
  width: 100%;
}
.row input { width: auto; flex: 1 1 200px; }
input[type='checkbox'], input[type='radio'] { width: auto; }
button, .button {
  font: inherit;
  font-weight: 500;
  display: inline-block;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--on-ink);
  text-decoration: none;
  cursor: pointer;
}
button.secondary { background: transparent; color: var(--ink); }
button.link { background: none; border: 0; padding: 0; color: inherit; text-decoration: underline; font-weight: 400; }
.rows { list-style: none; margin: 0; padding: 0; }
.rows li { padding: 8px 0; border-top: 1px solid var(--line); }
.rows li:first-child { border-top: 0; }
.rows.plain li { border: 0; padding: 4px 0; }
.mail li.unread .what, .mail li.unread .who { font-weight: 700; }
.mail a { text-decoration: none; }
.time { font-variant-numeric: tabular-nums; color: var(--muted); }
.tag { display: inline-block; font-size: 0.75rem; border: 1px solid var(--line); border-radius: 6px; padding: 0 6px; color: var(--muted); }
.tag.warn { color: var(--warn); border-color: var(--warn); }
.pager { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 6px 8px 6px 0; border-top: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 500; font-size: 0.875rem; }
.nowrap { white-space: nowrap; }
.meta { display: grid; grid-template-columns: auto 1fr; gap: 2px 12px; margin: 0 0 16px; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; overflow-wrap: anywhere; }
.mailbody { white-space: pre-wrap; overflow-wrap: anywhere; font: inherit; background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 14px 16px; }
.code { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 1.2rem; letter-spacing: 0.05em; }
details summary { cursor: pointer; color: var(--muted); margin-top: 8px; }
@media (max-width: 480px) { .pair { grid-template-columns: 1fr; } }