* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f3f4f6;
    color: #1f2937;
}

.topbar {
    background: #111827;
    color: white;
    padding: 20px 32px;
}

.topbar h1 {
    margin: 0;
    font-size: 28px;
}

.topbar span {
    opacity: 0.8;
}

main {
    padding: 32px;
}

.page-header {
    margin-bottom: 25px;
}

.page-header h2 {
    margin-bottom: 5px;
}

.page-header p {
    margin-top: 0;
    color: #6b7280;
}

.cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.card span {
    display: block;
    color: #6b7280;
    margin-bottom: 10px;
}

.card strong {
    font-size: 24px;
}

.welcome {
    margin-top: 25px;
    background: white;
    padding: 25px;
    border-radius: 12px;
}

@media (max-width: 900px) {
    .cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .cards {
        grid-template-columns: 1fr;
    }

    main {
        padding: 20px;
    }
}