:root {
  --primary-red: #B91C1C;
  --primary-dark-red: #7F1D1D;
  --primary-light-red: #DC2626;
  --primary-soft-red: #FEF2F2;
  --dark-slate: #0F172A;
  --sidebar-bg: #111827;
  --sidebar-hover: #1F2937;
  --text-main: #1F2937;
  --text-muted: #6B7280;
  --bg-page: #F8FAFC;
  --card-bg: #FFFFFF;
  --border-color: #E2E8F0;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', -apple-system, Roboto, sans-serif; }
body { background-color: var(--bg-page); color: var(--text-main); min-height: 100vh; }
.app-wrapper { display: flex; min-height: 100vh; }
.sidebar { width: 260px; background: var(--sidebar-bg); color: #fff; flex-shrink: 0; display: flex; flex-direction: column; border-right: 3px solid var(--primary-red); }
.sidebar-header { padding: 24px 20px; background: linear-gradient(135deg, var(--primary-dark-red), var(--primary-red)); }
.sidebar-header h2 { font-size: 19px; font-weight: 800; text-transform: uppercase; display: flex; align-items: center; gap: 8px; }
.brand-tag { font-size: 11px; background: rgba(255,255,255,0.25); padding: 2px 8px; border-radius: 4px; }
.nav-links { list-style: none; padding: 16px 12px; flex: 1; }
.nav-links li { margin-bottom: 6px; }
.nav-links a { display: flex; align-items: center; gap: 12px; padding: 11px 14px; color: #9CA3AF; text-decoration: none; font-weight: 600; font-size: 14px; border-radius: var(--radius-sm); transition: 0.2s; }
.nav-links a:hover { background: var(--sidebar-hover); color: #FFFFFF; }
.nav-links a.active { background: linear-gradient(90deg, var(--primary-red), var(--primary-light-red)); color: #FFFFFF; }
.sidebar-footer { padding: 16px 20px; background: rgba(0,0,0,0.25); font-size: 13px; }
.main-content { flex: 1; display: flex; flex-direction: column; }
.topbar { background: #FFFFFF; padding: 14px 28px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); }
.topbar .page-title { font-size: 19px; font-weight: 800; color: var(--dark-slate); }
.topbar .user-badge { display: flex; align-items: center; gap: 12px; }
.user-avatar { width: 38px; height: 38px; border-radius: 50%; background: var(--primary-red); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: bold; }
.content-container { padding: 28px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin-bottom: 28px; }
.stat-card { background: var(--card-bg); border-radius: var(--radius-md); padding: 22px; border: 1px solid var(--border-color); border-top: 4px solid var(--primary-red); }
.stat-card .label { font-size: 12.5px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; }
.stat-card .value { font-size: 28px; font-weight: 800; color: var(--dark-slate); margin-top: 8px; }
.stat-card.accent-red { background: linear-gradient(135deg, var(--primary-dark-red), var(--primary-red)); color: #FFFFFF; border-top: none; }
.stat-card.accent-red .label { color: rgba(255,255,255,0.8); }
.stat-card.accent-red .value { color: #FFFFFF; }
.card-panel { background: var(--card-bg); border-radius: var(--radius-md); border: 1px solid var(--border-color); margin-bottom: 24px; }
.card-header { padding: 18px 24px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
.card-header h3 { font-size: 16px; font-weight: 800; color: var(--dark-slate); }
.card-body { padding: 24px; }
.table-responsive { width: 100%; overflow-x: auto; }
.custom-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 13.5px; }
.custom-table th { background: #F1F5F9; color: #334155; font-weight: 700; padding: 12px 16px; border-bottom: 2px solid var(--border-color); text-transform: uppercase; font-size: 11.5px; }
.custom-table td { padding: 14px 16px; border-bottom: 1px solid var(--border-color); }
.custom-table tbody tr:hover { background: #F8FAFC; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: var(--radius-sm); font-size: 13.5px; font-weight: 700; text-decoration: none; cursor: pointer; border: none; transition: 0.2s; }
.btn-primary { background: linear-gradient(135deg, var(--primary-red), var(--primary-light-red)); color: #FFFFFF; }
.btn-primary:hover { background: var(--primary-dark-red); }
.btn-secondary { background: #E2E8F0; color: #1E293B; }
.btn-secondary:hover { background: #CBD5E1; }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13px; font-weight: 700; margin-bottom: 6px; }
.form-control { width: 100%; padding: 10px 14px; font-size: 14px; border: 1.5px solid var(--border-color); border-radius: var(--radius-sm); outline: none; }
.form-control:focus { border-color: var(--primary-red); box-shadow: 0 0 0 3px var(--primary-soft-red); }
.auth-body { background: linear-gradient(135deg, #0F172A, #450A0A); min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.auth-card { width: 100%; max-width: 460px; background: #FFFFFF; border-radius: var(--radius-lg); overflow: hidden; border-top: 6px solid var(--primary-red); }
.auth-header { padding: 30px 30px 20px; text-align: center; }
.auth-form { padding: 10px 30px 30px; }
.alert { padding: 12px 16px; border-radius: var(--radius-sm); font-size: 13.5px; font-weight: 600; margin-bottom: 18px; }
.alert-danger { background: #FEE2E2; color: #991B1B; border: 1px solid #FCA5A5; }
.alert-success { background: #DCFCE7; color: #166534; border: 1px solid #86EFAC; }
@media (max-width: 900px) { .app-wrapper { flex-direction: column; } .sidebar { width: 100%; } }