:root {
    --sidebar-bg: #1e3a5f;
    --sidebar-hover: #2c5282;
    --primary: #2563eb;
    --danger: #dc3545;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: #f8fafc;
}

.login-page {
    background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 100%);
}

.sidebar {
    background: var(--sidebar-bg);
    min-height: 100vh;
    color: #fff;
    padding: 1rem 0;
}

.sidebar .nav-link {
    color: rgba(255,255,255,0.85);
    padding: 0.6rem 1rem;
    border-radius: 0.25rem;
    margin: 0.15rem 0.5rem;
}

.sidebar .nav-link:hover, .sidebar .nav-link.active {
    background: var(--sidebar-hover);
    color: #fff;
}

.sidebar .nav-link i {
    margin-right: 0.5rem;
}

.main-content {
    padding: 1.5rem;
}

.card {
    border: none;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.table th {
    font-weight: 600;
    color: #475569;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
}

.stat-card {
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
}

.search-box {
    max-width: 300px;
}

@media (max-width: 768px) {
    .sidebar {
        min-height: auto;
    }
    .main-content {
        padding: 1rem;
    }
}