:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg: #f8fafc;
    --card: #ffffff;
    --border: #e2e8f0;
    --text: #1e293b;
    --text-muted: #64748b;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg); color: var(--text); min-height: 100vh;
}
/* Layout */
.app-layout {
    display: flex; min-height: 100vh;
}
.sidebar {
    width: 220px; background: var(--card); border-right: 1px solid var(--border);
    padding: 1.5rem 0; flex-shrink: 0;
}
.sidebar .brand {
    padding: 0 1.25rem 1.5rem; font-size: 1.1rem; font-weight: 700;
    border-bottom: 1px solid var(--border); margin-bottom: 0.5rem;
    color: var(--primary);
}
.sidebar .brand small { display: block; font-size: 0.7rem; color: var(--text-muted); font-weight: 400; }
.sidebar nav a {
    display: flex; align-items: center; gap: 0.5rem;
    padding: 0.6rem 1.25rem; color: var(--text); text-decoration: none;
    font-size: 0.9rem; transition: all 0.15s;
}
.sidebar nav a:hover { background: #f1f5f9; color: var(--primary); }
.sidebar nav a.active { background: #eff6ff; color: var(--primary); font-weight: 600; border-right: 3px solid var(--primary); }
.main-content {
    flex: 1; padding: 2rem; overflow-x: auto;
}
/* Cards */
.card {
    background: var(--card); border-radius: 8px; border: 1px solid var(--border);
    padding: 1.5rem; margin-bottom: 1.5rem;
}
.card h2 { font-size: 1.15rem; margin-bottom: 1rem; }
.stats-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem;
}
.stat-card {
    background: var(--card); border-radius: 8px; border: 1px solid var(--border);
    padding: 1.25rem; text-align: center;
}
.stat-card .stat-value { font-size: 1.6rem; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.25rem; }
/* Tables */
table {
    width: 100%; border-collapse: collapse; font-size: 0.9rem;
}
th, td {
    padding: 0.65rem 0.75rem; text-align: left; border-bottom: 1px solid var(--border);
}
th { background: #f8fafc; font-weight: 600; color: var(--text-muted); font-size: 0.8rem; text-transform: uppercase; }
tr:hover { background: #fafbfc; }
/* Forms */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 500; margin-bottom: 0.3rem; color: var(--text-muted); }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 0.5rem 0.75rem; border: 1px solid var(--border);
    border-radius: 6px; font-size: 0.9rem; transition: border-color 0.15s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }
/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 0.35rem;
    padding: 0.5rem 1rem; border-radius: 6px; font-size: 0.85rem; font-weight: 500;
    border: 1px solid var(--border); cursor: pointer; text-decoration: none;
    transition: all 0.15s;
}
.btn-primary { background: var(--primary); color: white; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: white; border-color: var(--success); }
.btn-warning { background: var(--warning); color: white; border-color: var(--warning); }
.btn-danger { background: var(--danger); color: white; border-color: var(--danger); }
.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.8rem; }
/* Badges */
.badge {
    display: inline-block; padding: 0.2rem 0.5rem; border-radius: 999px;
    font-size: 0.75rem; font-weight: 500;
}
.badge-primary { background: #eff6ff; color: var(--primary); }
/* Print */
@media print {
    .sidebar, .no-print { display: none !important; }
    .main-content { padding: 0; }
    .card { box-shadow: none; border: 1px solid #ddd; }
}
/* Responsive */
@media (max-width: 768px) {
    .sidebar { width: 60px; }
    .sidebar .brand span, .sidebar nav a span { display: none; }
    .sidebar nav a { justify-content: center; padding: 0.8rem; font-size: 1.2rem; }
    .form-row, .form-row-3 { grid-template-columns: 1fr; }
}
/* misc */
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-2 { margin-top: 1rem; }
.mb-2 { margin-bottom: 1rem; }
.flex { display: flex; }
.gap-2 { gap: 0.5rem; }
.justify-between { justify-content: space-between; }
.items-center { align-items: center; }