:root {
  --bg: #fafafa;
  --fg: #111;
  --muted: #666;
  --line: #e2e2e2;
  --accent: #0a84ff;
  --row-hover: #f0f4ff;
  --error: #b00020;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --fg: #f0f0f0;
    --muted: #999;
    --line: #2e2e2e;
    --accent: #5ea7ff;
    --row-hover: #1f2a40;
    --error: #ff6b6b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
}

header.page {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  padding: 24px 32px 16px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

h1 { margin: 0; font-size: 26px; }

.status { color: var(--muted); font-size: 13px; margin: 4px 0 0; }

.controls { display: flex; gap: 8px; }

#search {
  padding: 6px 10px;
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  min-width: 240px;
}

button {
  padding: 6px 14px;
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
}
button:hover { background: var(--row-hover); }

main { padding: 0 32px 40px; }

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}

th {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  font-weight: 600;
}

tbody tr { cursor: pointer; }
tbody tr:hover { background: var(--row-hover); }

.col-name    { width: 35%; }
.col-campus  { width: 20%; }
.col-source  { width: 25%; }
.col-time    { width: 20%; }

.serial { color: var(--muted); font-size: 12px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.fresh { color: #28a745; font-weight: 500; }
.stale { color: var(--muted); }

.empty, .error {
  text-align: center;
  padding: 40px 20px;
  color: var(--muted);
}
.error { color: var(--error); }

dialog {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  width: min(90vw, 720px);
  max-height: 80vh;
  overflow: auto;
}
dialog::backdrop { background: rgba(0,0,0,0.5); }
dialog header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0;
  background: var(--bg);
}
dialog h2 { margin: 0; font-size: 18px; }
dialog #detail-close {
  border: none;
  font-size: 22px;
  line-height: 1;
  padding: 2px 8px;
}
#detail-body { padding: 16px 20px; }

.month-header {
  font-weight: 600;
  margin: 16px 0 6px;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.day-row {
  display: grid;
  grid-template-columns: 50px 1fr auto;
  gap: 10px;
  padding: 6px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}
.day-row .day { font-variant-numeric: tabular-nums; color: var(--muted); }
.day-row .meta { color: var(--muted); font-size: 12px; }