:root {
  --primary: #007aff;
  --danger: #ff3b30;
  --ok: #34c759;
  --bg: #f7fafc;
  --card: #ffffff;
  --text: #1a202c;
  --muted: #4a5568;
  --border: #e2e8f0;
  --radius: 10px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 16px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.container { max-width: 1100px; margin: 0 auto; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
h1 { margin: 0 0 8px; font-size: 22px; }
h2 { margin: 0 0 10px; font-size: 18px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 800px) { .row { grid-template-columns: 1fr; } }
label { font-size: 13px; color: var(--muted); display: block; margin-bottom: 6px; }
input, select, button, textarea {
  font: inherit;
}
input[type="text"], input[type="number"], textarea, select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
}
/* Validation states */
.invalid {
  border-color: var(--danger) !important;
  background: #fff5f5;
}
textarea { resize: vertical; min-height: 60px; }
.btn {
  padding: 10px 14px; border: 0; border-radius: 8px; cursor: pointer; color: #fff; background: var(--primary);
}
.btn.secondary { background: #a0aec0; color: #fff; }
.btn.danger { background: var(--danger); }
.btn.ok { background: var(--ok); }
.btn:disabled { opacity: .6; cursor: not-allowed; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid var(--border); padding: 8px; text-align: center; font-size: 14px; }
th { background: #f1f5f9; text-transform: uppercase; font-size: 12px; color: var(--muted); }
.right { text-align: right; }
.actions { display: flex; gap: 8px; justify-content: center; }
.error { color: var(--danger); font-weight: 600; }
.hidden { display: none !important; }
.badge { padding: 2px 8px; background: #edf2f7; border-radius: 999px; font-size: 12px; color: #2d3748; }
.stack { display: grid; gap: 10px; }

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 1000;
}
.modal-content {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  width: min(720px, 95vw);
  box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

/* Tabs */
.tabs { display: flex; gap: 8px; margin: 0 0 12px; }
.tab-btn {
  background: #e2e8f0;
  color: #1f2937;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
}
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.tab-panel { margin-top: 0; }