:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #d97706;
    --bg: #f4f6fb;
}
body { background: var(--bg); font-family: 'Segoe UI', Tahoma, sans-serif; }

.sidebar {
    width: 240px;
    min-height: 100vh;
    background: #111827;
    color: #e5e7eb;
    position: sticky;
    top: 0;
}
.sidebar-brand {
    padding: 20px;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid #1f2937;
}
.sidebar-brand span { color: #60a5fa; }
.sidebar .nav-link {
    color: #9ca3af;
    padding: 12px 20px;
    border-left: 3px solid transparent;
}
.sidebar .nav-link i { margin-right: 8px; }
.sidebar .nav-link:hover { color: #fff; background: #1f2937; }
.sidebar .nav-link.active {
    color: #fff;
    background: #1f2937;
    border-left-color: var(--primary);
}

.main-content { min-height: 100vh; }
.topbar {
    background: #fff;
    padding: 12px 24px;
    border-bottom: 1px solid #e5e7eb;
}
.page-content { padding: 24px; }

.card-stat {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.card-stat .value { font-size: 28px; font-weight: 700; }
.card-stat .label { color: #6b7280; font-size: 13px; }

.badge-success { background: #dcfce7; color: #166534; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-secondary { background: #e5e7eb; color: #374151; }

.table-card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e40af, #111827);
}
.login-card {
    background: #fff;
    border-radius: 16px;
    padding: 40px;
    width: 380px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}