:root {
    --sidebar-bg: #1e293b;
    --main-bg: #f1f5f9;
    --primary: #0284c7;
    --white: #ffffff;
}

body { margin: 0; font-family: 'Inter', sans-serif; background: var(--main-bg); }

.admin-container { display: flex; min-height: 100vh; }

.sidebar { 
    width: 260px; 
    background: var(--sidebar-bg); 
    color: white; 
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.sidebar .logo { font-size: 1.5rem; font-weight: 800; margin-bottom: 40px; color: var(--primary); }

.sidebar nav a { 
    color: #cbd5e1; 
    text-decoration: none; 
    padding: 12px; 
    display: block; 
    border-radius: 8px;
    margin-bottom: 5px;
}

.sidebar nav a.active, .sidebar nav a:hover { background: #334155; color: white; }

.main-content { flex: 1; padding: 40px; }

.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 20px; }

.stat-card { 
    background: white; 
    padding: 20px; 
    border-radius: 12px; 
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.btn-primary { 
    background: var(--primary); 
    color: white; 
    border: none; 
    padding: 10px 20px; 
    border-radius: 6px; 
    cursor: pointer;
    font-weight: 600;
}