:root { 
    --sidebar-bg: #0f172a; 
    --accent: #6366f1; 
    --bg-main: #f8fafc; 
}

body { 
    background: var(--bg-main); 
    font-family: 'Plus Jakarta Sans', sans-serif; 
    font-size: 0.82rem; 
    color: #1e293b; 
    overflow-x: hidden; 
}

/* Sidebar Navigation */
#sidebar { 
    width: 260px; 
    height: 100vh; 
    position: fixed; 
    background: var(--sidebar-bg); 
    color: #94a3b8; 
    z-index: 1000; 
    overflow-y: auto; 
}

.nav-link { 
    color: inherit; 
    padding: 0.7rem 1.2rem; 
    border-radius: 10px; 
    margin: 0.2rem 15px; 
    transition: 0.2s; 
    display: flex; 
    align-items: center; 
    cursor: pointer; 
    text-decoration: none;
}

.nav-link:hover { 
    background: #1e293b; 
    color: #fff; 
}

.nav-link.active { 
    background: var(--accent); 
    color: #fff; 
    font-weight: 600; 
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3); 
}

.nav-link i { 
    font-size: 1.1rem; 
    margin-right: 12px; 
}

.nav-cat { 
    font-size: 0.65rem; 
    text-transform: uppercase; 
    letter-spacing: 1px; 
    padding: 1.2rem 1.5rem 0.4rem; 
    color: #475569; 
    font-weight: 800; 
}

/* Main Content */
#main { 
    margin-left: 260px; 
    padding: 2rem; 
    transition: 0.3s; 
}

.card { 
    border: none; 
    border-radius: 16px; 
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.04); 
    background: #fff; 
}

/* Search Box */
.search-container { 
    position: relative; 
    width: 100%; 
    max-width: 300px; 
}

.search-box { 
    width: 100%; 
    padding: 7px 15px 7px 35px; 
    border-radius: 10px; 
    border: 1px solid #e2e8f0; 
    font-size: 0.8rem; 
    transition: 0.3s; 
}

.search-box:focus { 
    outline: none; 
    border-color: var(--accent); 
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1); 
}

.search-icon { 
    position: absolute; 
    left: 12px; 
    top: 50%; 
    transform: translateY(-50%); 
    color: #94a3b8; 
}

.page-section { 
    display: none; 
}

.page-section.active { 
    display: block; 
    animation: slideUp 0.3s ease; 
}

@keyframes slideUp { 
    from { opacity: 0; transform: translateY(10px); } 
    to { opacity: 1; transform: translateY(0); } 
}

@media print {
    #sidebar, #main, .modal, .btn, .search-container, .no-print { 
        display: none !important; 
    }
    #po-print { 
        display: block !important; 
        width: 100%;
    }
    body { background: white; }
}