* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f3f4f6;
    color: #111827;
}

.erp-layout {
    min-height: 100vh;
    display: flex;
}

.erp-sidebar {
    width: 220px;
    background: #111827;
    color: #f9fafb;
    padding: 16px;
}

.erp-brand {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.erp-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.erp-nav a {
    color: #e5e7eb;
    text-decoration: none;
    padding: 8px 10px;
    border-radius: 6px;
}

.erp-nav a:hover {
    background: #1f2937;
}

.erp-main {
    flex: 1;
    padding: 20px;
}

.erp-header h1 {
    margin: 0 0 16px;
}

.erp-card {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 16px;
}