:root {
  color-scheme: light dark;
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #1c1e21;
  --muted: #6b7280;
  --accent: #2563eb;
  --danger: #dc2626;
  --border: #e2e4e8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c;
    --card-bg: #212327;
    --text: #e7e9ea;
    --muted: #9aa0a6;
    --accent: #5b9dff;
    --danger: #f87171;
    --border: #33363b;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1.5rem;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 600; }
.topbar nav { display: flex; gap: 1.2rem; align-items: center; }
.topbar nav a { color: var(--text); text-decoration: none; }
.topbar nav a:hover { color: var(--accent); }
main { padding: 2rem 1.5rem; max-width: 900px; margin: 0 auto; }
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
}
.card.narrow { max-width: 420px; margin: 2rem auto; }
fieldset { border: 1px solid var(--border); border-radius: 8px; margin: 0 0 1rem; padding: 0.8rem 1rem 0.2rem; }
legend { padding: 0 0.4rem; font-size: 0.85rem; color: var(--muted); }
.spec-field { margin-bottom: 0.7rem; }
.hint { color: var(--muted); font-size: 0.85rem; margin: 0.2rem 0 0.6rem; }
.band-checkboxes { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; margin-bottom: 0.8rem; }
.band-checkbox { display: flex; align-items: center; gap: 0.3rem; width: auto; margin: 0; font-size: 0.85rem; }
.band-checkbox input { display: inline-block; width: auto; margin: 0; }
.autocomplete-wrapper { position: relative; }
.autocomplete-list {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 2px);
  z-index: 20;
  margin: 0;
  padding: 0.25rem 0;
  list-style: none;
  max-height: 220px;
  overflow-y: auto;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}
.autocomplete-list li { padding: 0.4rem 0.6rem; font-size: 0.9rem; cursor: pointer; }
.autocomplete-list li:hover, .autocomplete-list li.active { background: var(--accent); color: #fff; }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
h1 { font-size: 1.3rem; margin: 0 0 1rem; }
label { display: block; margin-bottom: 0.9rem; font-size: 0.9rem; color: var(--muted); }
input, select, textarea {
  display: block;
  width: 100%;
  margin-top: 0.3rem;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
}
textarea { font-family: ui-monospace, monospace; font-size: 0.85rem; }
button, .button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
}
.button.secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.link-button { background: none; border: none; color: var(--accent); cursor: pointer; padding: 0; font-size: 0.9rem; }
.link-button.danger { color: var(--danger); }
.inline-form { display: inline; margin: 0; }
.form-actions { display: flex; gap: 0.8rem; align-items: center; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 0.6rem 0.4rem; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.row-actions { display: flex; gap: 0.8rem; }
.row-actions a { color: var(--accent); text-decoration: none; }
.empty { color: var(--muted); text-align: center; padding: 1.5rem; }
.error { color: var(--danger); font-size: 0.9rem; }
.success { color: #16a34a; font-size: 0.9rem; }