:root {
    --bg: #f4f5f7;
    --panel: #ffffff;
    --border: #e2e4e9;
    --text: #1f2430;
    --text-muted: #6b7280;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --success: #059669;
    --warn: #d97706;
    --radius: 8px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.app-shell { display: flex; min-height: 100vh; }

.sidebar {
    width: 220px;
    background: #111827;
    color: #d1d5db;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}
.sidebar .brand { padding: 20px 16px; font-weight: 700; font-size: 1.1rem; color: #fff; border-bottom: 1px solid #1f2937; }
.sidebar nav { display: flex; flex-direction: column; padding: 12px 0; flex: 1; }
.sidebar nav a { color: #d1d5db; padding: 10px 16px; text-decoration: none; font-size: 0.92rem; }
.sidebar nav a:hover { background: #1f2937; color: #fff; }
.sidebar-footer { padding: 14px 16px; border-top: 1px solid #1f2937; font-size: 0.85rem; }
.user-chip { margin-bottom: 6px; }
.role-tag { background: #374151; padding: 1px 6px; border-radius: 4px; font-size: 0.72rem; margin-left: 4px; }
.logout-link { color: #f87171; text-decoration: none; }

.main-content { flex: 1; padding: 28px 32px; max-width: 1400px; }
.main-content.full-width { max-width: 420px; margin: 60px auto; }

h1 { font-size: 1.5rem; margin: 0 0 6px; }
h2 { font-size: 1.15rem; margin: 0 0 12px; }
.subtitle { color: var(--text-muted); margin-bottom: 24px; }

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.stat-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.stat-card .stat-value { font-size: 1.8rem; font-weight: 700; }
.stat-card .stat-label { color: var(--text-muted); font-size: 0.85rem; }

table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }
tr:hover td { background: #fafafa; }
table a { color: var(--primary); text-decoration: none; }

.btn {
    display: inline-block;
    padding: 9px 16px;
    border-radius: 6px;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
}
.btn:hover { background: var(--primary-dark); }
.btn-secondary { background: #6b7280; }
.btn-danger { background: var(--danger); }
.btn-sm { padding: 5px 10px; font-size: 0.8rem; }

.form-group { margin-bottom: 14px; }
.form-group label { display: block; margin-bottom: 4px; font-size: 0.85rem; font-weight: 600; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 9px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 0.9rem;
    font-family: inherit;
}
.form-row { display: flex; gap: 14px; }
.form-row .form-group { flex: 1; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 12px; font-size: 0.75rem; font-weight: 600; color: #fff; }
.badge-urgent { background: #dc2626; } .badge-high { background: #ea580c; }
.badge-medium { background: #d97706; } .badge-low { background: #65a30d; }
.badge-open { background: #2563eb; } .badge-progress { background: #7c3aed; }
.badge-waiting { background: #d97706; } .badge-resolved { background: #059669; } .badge-closed { background: #6b7280; }

.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; font-size: 0.9rem; }
.flash-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.flash-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

.top-actions { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.reveal-btn { background: none; border: 1px solid var(--border); border-radius: 4px; cursor: pointer; padding: 2px 8px; font-size: 0.8rem; }
.chart-box { position: relative; height: 260px; }
.tag-pill { background: #eef2ff; color: #3730a3; padding: 2px 8px; border-radius: 10px; font-size: 0.78rem; }
.ai-box { background: #f5f3ff; border: 1px solid #ddd6fe; border-radius: 8px; padding: 14px; font-size: 0.9rem; }