:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --danger: #dc2626;
  --success: #16a34a;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  background: var(--card);
  padding: 2rem;
  border-radius: 0.75rem;
  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  width: 100%;
  max-width: 360px;
}

.login-card h1 { margin-top: 0; }

.form-group { margin-bottom: 1rem; }
label { display: block; font-size: 0.875rem; margin-bottom: 0.25rem; }
input, select, textarea {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  font-size: 1rem;
}

button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  cursor: pointer;
  font-size: 0.9375rem;
}
button:hover { background: var(--primary-dark); }
button.secondary { background: var(--muted); }
button.danger { background: var(--danger); }

.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px;
  background: var(--card);
  border-right: 1px solid var(--border);
  padding: 1rem;
}
.sidebar h2 { margin-top: 0; font-size: 1.25rem; }
.sidebar nav a {
  display: block;
  padding: 0.5rem;
  color: var(--text);
  text-decoration: none;
  border-radius: 0.375rem;
  margin-bottom: 0.25rem;
}
.sidebar nav a:hover, .sidebar nav a.active { background: var(--bg); }
.main { flex: 1; padding: 1.5rem; overflow: auto; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem;
}
.card h3 { margin: 0 0 0.5rem; font-size: 0.875rem; color: var(--muted); }
.card .value { font-size: 1.75rem; font-weight: 600; }

table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 0.5rem; overflow: hidden; }
th, td { text-align: left; padding: 0.75rem; border-bottom: 1px solid var(--border); }
th { background: var(--bg); font-size: 0.875rem; }

.modal-backdrop {
  position: fixed; inset: 0; background: rgba(0,0,0,0.4);
  display: flex; align-items: center; justify-content: center;
}
.modal {
  background: var(--card);
  padding: 1.5rem;
  border-radius: 0.5rem;
  width: 100%; max-width: 480px;
}

.error { color: var(--danger); margin-top: 0.5rem; }
.empty { color: var(--muted); padding: 1rem 0; }
.header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }