:root {
  --bg: #f6f6f4;
  --fg: #1d1d1b;
  --muted: #6b6b66;
  --card: #ffffff;
  --border: #d9d9d4;
  --accent: #2f5fb3;
  --open: #1f7a3a;
  --closed: #a4372b;
  --error-bg: #fbe9e7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --fg: #e8e8e4;
    --muted: #9a9a94;
    --card: #20201e;
    --border: #3a3a36;
    --accent: #7ea6ec;
    --open: #6cc486;
    --closed: #ec8a7e;
    --error-bg: #3b1f1b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.45 system-ui, sans-serif;
}

header {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

nav { display: flex; gap: 16px; align-items: center; }
a, .link { color: var(--accent); }
.link { background: none; border: none; padding: 0; font: inherit; cursor: pointer; text-decoration: underline; }

main { max-width: 900px; margin: 0 auto; padding: 16px; }

h2 { font-size: 1.2em; margin: 24px 0 8px; }
h2:first-child { margin-top: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
}

.card.pending { border-color: var(--accent); }
button:disabled { cursor: not-allowed; opacity: 0.5; }

.muted { color: var(--muted); }
.open { color: var(--open); font-weight: 600; }
.closed { color: var(--closed); font-weight: 600; }

.error {
  background: var(--error-bg);
  color: var(--closed);
  border-radius: 6px;
  padding: 8px 10px;
  margin: 8px 0;
  white-space: pre-wrap;
}
.error:empty { display: none; }

input, select, textarea, button {
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 8px;
}
button { cursor: pointer; background: var(--card); }
button.primary { background: var(--accent); color: var(--bg); border-color: var(--accent); }
input:invalid, .invalid { border-color: var(--closed); }
textarea { width: 100%; min-height: 4.5em; font-family: ui-monospace, monospace; font-size: 13px; }
textarea.raw { min-height: 60vh; }

label { display: block; margin: 8px 0 2px; font-weight: 600; font-size: 0.9em; }
label.inline { display: inline-flex; gap: 4px; align-items: center; font-weight: normal; margin: 0; }

.row { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 4px 0; }
.days { display: flex; flex-wrap: wrap; gap: 2px 8px; }
.grow { flex: 1 1 140px; }
.narrow { width: 5em; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 12px 0; position: sticky; top: 0; background: var(--bg); padding: 8px 0; z-index: 1; }

details > summary { cursor: pointer; font-weight: 600; font-size: 1.05em; }
details[open] > summary { margin-bottom: 8px; }
.sub { border-left: 3px solid var(--border); padding-left: 10px; margin: 8px 0; }

table { width: 100%; border-collapse: collapse; }
td, th { text-align: left; padding: 6px 4px; border-bottom: 1px solid var(--border); vertical-align: top; }

@media (max-width: 600px) {
  table.groups thead { display: none; }
  table.groups tr { display: block; border-bottom: 1px solid var(--border); padding: 6px 0; }
  table.groups td { display: block; border: none; padding: 2px 0; }
}