:root {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-card-hover: #222632;
  --bg-sidebar: #141620;
  --border: #2a2e3a;
  --text: #e4e6f0;
  --text-muted: #8b8fa3;
  --primary: #6366f1;
  --primary-hover: #818cf8;
  --success: #22c55e;
  --success-hover: #4ade80;
  --danger: #ef4444;
  --danger-hover: #f87171;
  --warning: #f59e0b;
  --info: #3b82f6;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,.3);
}
* { margin:0; padding:0; box-sizing:border-box; }
body { font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; background: var(--bg); color: var(--text); display:flex; min-height:100vh; }

/* SIDEBAR */
.sidebar { width:240px; background:var(--bg-sidebar); border-right:1px solid var(--border); display:flex; flex-direction:column; position:fixed; height:100vh; z-index:100; }
.sidebar-header { padding:1.25rem; border-bottom:1px solid var(--border); }
.logo { display:flex; align-items:center; gap:.75rem; font-size:1.25rem; font-weight:700; color:var(--primary); }
.logo svg { stroke:var(--primary); }
.sidebar-nav { padding:.75rem; display:flex; flex-direction:column; gap:.25rem; flex:1; }
.nav-item { display:flex; align-items:center; gap:.75rem; padding:.65rem .85rem; border-radius:var(--radius); color:var(--text-muted); text-decoration:none; font-size:.9rem; transition:all .2s; }
.nav-item:hover { background:var(--bg-card-hover); color:var(--text); }
.nav-item.active { background:var(--primary); color:#fff; }
.nav-item svg { flex-shrink:0; }

/* MAIN */
.main-content { margin-left:240px; flex:1; padding:1.5rem 2rem; overflow-y:auto; }
.page { display:none; }
.page.active { display:block; animation: fadeIn .3s; }
@keyframes fadeIn { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:translateY(0)} }

.page-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:1.5rem; }
.page-header h1 { font-size:1.5rem; font-weight:700; }

/* CARDS */
.card { background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); padding:1.25rem; margin-bottom:1rem; }
.card h3 { font-size:1rem; font-weight:600; margin-bottom:1rem; color:var(--text-muted); }

/* STATS */
.stats-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(200px, 1fr)); gap:1rem; margin-bottom:1.5rem; }
.stat-card { background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); padding:1.25rem; position:relative; overflow:hidden; }
.stat-card::before { content:''; position:absolute; top:0; left:0; right:0; height:3px; }
.stat-card.blue::before { background:var(--info); }
.stat-card.green::before { background:var(--success); }
.stat-card.purple::before { background:var(--primary); }
.stat-card.orange::before { background:var(--warning); }
.stat-card.red::before { background:var(--danger); }
.stat-card .stat-label { font-size:.8rem; color:var(--text-muted); margin-bottom:.5rem; }
.stat-card .stat-value { font-size:1.75rem; font-weight:700; }
.stat-card.blue .stat-value { color:var(--info); }
.stat-card.green .stat-value { color:var(--success); }
.stat-card.purple .stat-value { color:var(--primary); }
.stat-card.orange .stat-value { color:var(--warning); }
.stat-card.red .stat-value { color:var(--danger); }
.stat-card .stat-sub { font-size:.75rem; color:var(--text-muted); margin-top:.25rem; }

/* CHARTS */
.charts-grid { display:grid; grid-template-columns:2fr 1fr; gap:1rem; margin-bottom:1rem; }
.chart-card { min-height:320px; }
.chart-card canvas { max-height:280px; }

/* GRID 2 COLS */
.grid-2col { display:grid; grid-template-columns:1fr 1fr; gap:1rem; }

/* TABLES */
.table-container { overflow-x:auto; }
table { width:100%; border-collapse:collapse; font-size:.85rem; }
thead th { text-align:left; padding:.65rem .75rem; background:rgba(99,102,241,.08); color:var(--text-muted); font-weight:600; white-space:nowrap; border-bottom:1px solid var(--border); }
tbody td { padding:.6rem .75rem; border-bottom:1px solid var(--border); }
tbody tr:hover { background:var(--bg-card-hover); }

/* FORMS */
.form-group { margin-bottom:.85rem; }
.form-group label { display:block; font-size:.8rem; color:var(--text-muted); margin-bottom:.35rem; font-weight:500; }
.form-row { display:flex; gap:1rem; }
.form-row .form-group { flex:1; }
.flex-grow { flex:1 !important; }
input[type="text"], input[type="email"], input[type="number"], input[type="date"], input[type="password"], select, textarea {
  width:100%; padding:.55rem .75rem; background:var(--bg); border:1px solid var(--border); border-radius:6px; color:var(--text); font-size:.85rem; transition:border-color .2s;
}
input:focus, select:focus, textarea:focus { outline:none; border-color:var(--primary); }
.input-sm { padding:.45rem .65rem; font-size:.8rem; width:auto; }
.input-with-btn { display:flex; gap:.5rem; }
.input-with-btn select { flex:1; }
.checkbox-label { display:flex; align-items:center; gap:.4rem; font-size:.85rem; color:var(--text-muted); cursor:pointer; }

/* BUTTONS */
.btn { padding:.55rem 1.1rem; border:none; border-radius:6px; font-size:.85rem; font-weight:600; cursor:pointer; transition:all .2s; display:inline-flex; align-items:center; gap:.4rem; }
.btn:hover { transform:translateY(-1px); }
.btn-primary { background:var(--primary); color:#fff; }
.btn-primary:hover { background:var(--primary-hover); }
.btn-success { background:var(--success); color:#fff; }
.btn-success:hover { background:var(--success-hover); }
.btn-danger { background:var(--danger); color:#fff; }
.btn-danger:hover { background:var(--danger-hover); }
.btn-secondary { background:var(--border); color:var(--text); }
.btn-secondary:hover { background:var(--bg-card-hover); }
.btn-sm { padding:.35rem .7rem; font-size:.78rem; }
.btn-icon { padding:.35rem; background:none; border:none; color:var(--text-muted); cursor:pointer; border-radius:4px; }
.btn-icon:hover { background:var(--bg-card-hover); color:var(--text); }
.btn-icon.danger:hover { color:var(--danger); }

/* MODALS */
.modal-overlay { display:none; position:fixed; inset:0; background:rgba(0,0,0,.6); z-index:1000; align-items:center; justify-content:center; backdrop-filter:blur(4px); }
.modal-overlay.show { display:flex; }
.modal { background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); width:90%; max-width:550px; max-height:90vh; overflow-y:auto; animation: modalIn .2s; }
.modal-lg { max-width:700px; }
@keyframes modalIn { from{opacity:0;transform:scale(.95)} to{opacity:1;transform:scale(1)} }
.modal-header { display:flex; align-items:center; justify-content:space-between; padding:1rem 1.25rem; border-bottom:1px solid var(--border); }
.modal-header h2 { font-size:1.1rem; }
.modal-close { background:none; border:none; font-size:1.5rem; color:var(--text-muted); cursor:pointer; }
.modal-close:hover { color:var(--text); }
.modal-body { padding:1.25rem; }
.modal-footer { padding:1rem 1.25rem; border-top:1px solid var(--border); display:flex; justify-content:flex-end; gap:.75rem; }

/* VENTA LAYOUT */
.venta-layout { max-width:900px; }
.venta-totals { margin-top:1rem; display:flex; flex-direction:column; align-items:flex-end; gap:.5rem; }
.total-row { display:flex; gap:2rem; font-size:.9rem; }
.total-final { font-size:1.2rem; font-weight:700; color:var(--success); }
.form-actions { margin-top:1rem; display:flex; justify-content:flex-end; gap:.75rem; }

/* SEARCH RESULTS */
.search-results { background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); max-height:200px; overflow-y:auto; margin-bottom:1rem; }
.search-item { padding:.6rem .85rem; cursor:pointer; font-size:.85rem; display:flex; justify-content:space-between; border-bottom:1px solid var(--border); }
.search-item:hover { background:var(--bg-card-hover); }
.search-item .si-stock { color:var(--text-muted); font-size:.8rem; }

/* FILTERS */
.filters-row { display:flex; gap:.75rem; align-items:center; margin-bottom:1rem; flex-wrap:wrap; }

/* FACTURA PRINT */
#facturaDetalle .factura-header { text-align:center; margin-bottom:1rem; }
#facturaDetalle .factura-header h2 { color:var(--primary); }
#facturaDetalle .factura-info { display:grid; grid-template-columns:1fr 1fr; gap:.5rem; margin-bottom:1rem; font-size:.85rem; }
#facturaDetalle .factura-info span { color:var(--text-muted); }

/* BADGES */
.badge { padding:.2rem .55rem; border-radius:20px; font-size:.7rem; font-weight:600; }
.badge-success { background:rgba(34,197,94,.15); color:var(--success); }
.badge-danger { background:rgba(239,68,68,.15); color:var(--danger); }
.badge-warning { background:rgba(245,158,11,.15); color:var(--warning); }
.badge-info { background:rgba(59,130,246,.15); color:var(--info); }

/* TOAST */
#toastContainer { position:fixed; top:1rem; right:1rem; z-index:9999; display:flex; flex-direction:column; gap:.5rem; }
.toast { padding:.75rem 1.25rem; border-radius:8px; font-size:.85rem; font-weight:500; animation:toastIn .3s; min-width:280px; box-shadow:var(--shadow); }
.toast-success { background:#16a34a; color:#fff; }
.toast-error { background:#dc2626; color:#fff; }
.toast-info { background:#2563eb; color:#fff; }
@keyframes toastIn { from{opacity:0;transform:translateX(40px)} to{opacity:1;transform:translateX(0)} }

/* LOGIN */
.login-container { display:flex; align-items:center; justify-content:center; min-height:100vh; width:100%; background:var(--bg); padding:1rem; }
.login-card { background:var(--bg-card); border:1px solid var(--border); border-radius:16px; padding:2.5rem; width:100%; max-width:420px; box-shadow:0 8px 40px rgba(0,0,0,.4); animation:modalIn .4s; }
.login-logo { text-align:center; margin-bottom:2rem; }
.login-logo svg { stroke:var(--primary); margin-bottom:.75rem; }
.login-logo h1 { font-size:1.75rem; font-weight:700; color:var(--primary); }
.login-logo p { font-size:.85rem; color:var(--text-muted); margin-top:.25rem; }
.login-error { background:rgba(239,68,68,.12); border:1px solid rgba(239,68,68,.3); color:var(--danger); padding:.6rem .85rem; border-radius:6px; font-size:.82rem; margin-bottom:1rem; text-align:center; }
.btn-block { width:100%; justify-content:center; padding:.7rem; font-size:.95rem; margin-top:.5rem; }
.login-footer { margin-top:1.5rem; padding-top:1rem; border-top:1px solid var(--border); font-size:.78rem; color:var(--text-muted); text-align:center; }
.login-demo { margin-top:.4rem; display:flex; align-items:center; justify-content:center; gap:.5rem; font-size:.78rem; }

/* SIDEBAR FOOTER */
.sidebar-footer { padding:.85rem; border-top:1px solid var(--border); display:flex; align-items:center; justify-content:space-between; }
.user-info { display:flex; align-items:center; gap:.65rem; }
.user-avatar { width:34px; height:34px; border-radius:50%; background:var(--primary); color:#fff; display:flex; align-items:center; justify-content:center; font-size:.8rem; font-weight:700; flex-shrink:0; }
.user-details { display:flex; flex-direction:column; }
.user-name { font-size:.82rem; font-weight:600; color:var(--text); line-height:1.2; }
.user-role { font-size:.7rem; color:var(--text-muted); }

/* ROLE HIDDEN */
.admin-only { display:none; }
body.role-admin .admin-only { display:flex; }

/* TOGGLE SWITCH */
.tax-toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  font-weight: 600;
}
.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.9rem;
}
.toggle-label input { display: none; }
.toggle-switch {
  position: relative;
  width: 40px;
  height: 22px;
  background: var(--border);
  border-radius: 11px;
  transition: background 0.2s;
}
.toggle-switch::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all 0.2s;
}
.toggle-label input:checked + .toggle-switch {
  background: var(--success);
}
.toggle-label input:checked + .toggle-switch::after {
  left: 21px;
  background: #fff;
}

/* RESPONSIVE */
@media (max-width:1024px) {
  .charts-grid, .grid-2col { grid-template-columns:1fr; }
}
@media (max-width:768px) {
  .sidebar { width:60px; }
  .sidebar .nav-item span, .sidebar .logo span { display:none; }
  .sidebar-header { padding:.75rem; justify-content:center; }
  .logo { justify-content:center; }
  .main-content { margin-left:60px; padding:1rem; }
  .form-row { flex-direction:column; gap:0; }
  .stats-grid { grid-template-columns:1fr 1fr; }
  .sidebar-footer .user-details { display:none; }
}