:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header {
  padding: 2rem 1.5rem 1rem;
  text-align: center;
}

header h1 { margin: 0 0 0.25rem; font-size: 1.75rem; }
.subtitle { color: var(--muted); margin: 0; }

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; }

.tab-btn {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 0.5rem 1rem;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
}

.tab-btn.active { color: var(--text); border-bottom-color: var(--panel); background: var(--panel); font-weight: 600; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
}

.card h2 { margin-top: 0; font-size: 1.1rem; }

.card-header { display: flex; align-items: center; justify-content: space-between; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 0.5rem;
}

label { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.85rem; color: var(--muted); }

label.checkbox, label.checkbox-inline {
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
}

input[type="text"], input[type="password"], input[type="number"], textarea {
  background: #0b1220;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 0.5rem 0.65rem;
  font-size: 0.95rem;
}

textarea { font-family: inherit; resize: vertical; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.rule-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
  align-items: end;
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 0.75rem;
}

.field { display: flex; flex-direction: column; gap: 0.35rem; }
.field label { color: var(--muted); font-size: 0.8rem; }

.checkbox-list { display: flex; flex-wrap: wrap; gap: 0.6rem; }

.actions { display: flex; gap: 0.75rem; margin-bottom: 1.25rem; flex-wrap: wrap; }

button {
  border: none;
  border-radius: 6px;
  padding: 0.55rem 1.1rem;
  font-size: 0.9rem;
  cursor: pointer;
}

button.primary { background: var(--primary); color: white; }
button.primary:hover { background: var(--primary-hover); }

button.secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
button.secondary:hover { border-color: var(--muted); }

button.danger { background: var(--danger); color: white; }
button.danger:hover { background: var(--danger-hover); }

button.small { padding: 0.35rem 0.7rem; font-size: 0.8rem; }

pre#result {
  background: #0b1220;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 320px;
  overflow: auto;
  font-size: 0.85rem;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 1rem;
}