:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --danger: #dc2626;
  --ok-bg: #ecfdf5;
  --err-bg: #fef2f2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #181b21;
    --text: #e6e8eb;
    --muted: #9aa3ae;
    --border: #2a2f37;
    --accent: #60a5fa;
    --danger: #f87171;
    --ok-bg: #0f2a1f;
    --err-bg: #2d1414;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 12px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 600; color: var(--text); }
.topbar nav { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }

main { max-width: 860px; margin: 24px auto; padding: 0 16px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}
.card.narrow { max-width: 420px; margin-left: auto; margin-right: auto; }
h1 { font-size: 22px; margin: 0 0 16px; }
h2 { font-size: 18px; margin: 0 0 12px; }

.muted { color: var(--muted); font-size: 14px; }

.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; }
.alert.error { background: var(--err-bg); color: var(--danger); }
.alert.notice { background: var(--ok-bg); }

input, select, button {
  font: inherit;
  color: inherit;
}
input, select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
}
button {
  padding: 8px 14px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
.item-actions button, .fact-edit button, .item > form button {
  background: transparent;
  padding: 4px 8px;
  border: 1px solid var(--border);
}
button.link { background: none; color: var(--accent); padding: 0; }
button.danger:hover { border-color: var(--danger); }

.stack { display: flex; flex-direction: column; gap: 12px; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.grid .wide { grid-column: 1 / -1; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; }
form.inline { display: inline; }

.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.chip {
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-size: 14px;
}
.chip.active { border-color: var(--accent); color: var(--accent); }

.list { list-style: none; margin: 0; padding: 0; }
.item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.item:first-child { border-top: 0; }
.item.overdue .item-title { color: var(--danger); }
.item.done .item-title span:first-child { text-decoration: line-through; color: var(--muted); }
.item-main { min-width: 0; flex: 1; overflow-wrap: anywhere; }
.item-title { display: flex; gap: 6px; align-items: baseline; font-weight: 500; }
.item-actions { display: flex; gap: 6px; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; font-size: 13px; color: var(--muted); margin-top: 4px; }
.tag { background: var(--bg); border-radius: 4px; padding: 0 6px; }
.status { margin-left: auto; }

.fact-edit { display: grid; grid-template-columns: 1fr 2fr auto; gap: 8px; flex: 1; }

.code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 14px;
  font-size: 18px;
}

@media (max-width: 560px) {
  .grid { grid-template-columns: 1fr; }
  .fact-edit { grid-template-columns: 1fr; }
}