:root {
  --bg: #f8f9fa;
  --fg: #212529;
  --brand: #22a06b;
  --muted: #6c757d;
  --danger: #dc3545;
  --border: #dee2e6;
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  margin: 0;
  line-height: 1.5;
}
header { background: white; border-bottom: 1px solid var(--border); padding: 1rem 2rem; display: flex; justify-content: space-between; align-items: center; }
header h1 { margin: 0; font-size: 1.3rem; }
nav a { color: var(--fg); text-decoration: none; margin-right: .5rem; }
nav a:hover { color: var(--brand); }
nav button { background: none; border: 1px solid var(--border); padding: .25rem .5rem; border-radius: 4px; cursor: pointer; }
main { max-width: 900px; margin: 2rem auto; padding: 0 2rem; }
main.login { max-width: 400px; }
label { display: block; margin: 1rem 0 .25rem; font-weight: 500; }
input, textarea { width: 100%; padding: .5rem; border: 1px solid var(--border); border-radius: 4px; font-size: 1rem; font-family: inherit; }
textarea { resize: vertical; }
button[type=submit] { background: var(--brand); color: white; border: none; padding: .6rem 1.2rem; border-radius: 4px; cursor: pointer; font-size: 1rem; margin-top: 1rem; }
button[type=submit].danger { background: var(--danger); margin-top: 0; padding: .4rem .8rem; }
.error { background: #fde2e2; color: #7a1f1f; padding: .75rem 1rem; border-radius: 4px; }
.success { background: #ddf5e5; color: #1a5e37; padding: .75rem 1rem; border-radius: 4px; }
table { width: 100%; border-collapse: collapse; margin-top: 1rem; background: white; }
th, td { text-align: left; padding: .6rem .8rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: #f1f3f5; font-weight: 600; }
td.context { max-width: 340px; color: var(--muted); font-size: .9rem; }