:root {
    --bg: #1e1e1e;
    --text: #fff;
    --card: #2e2e2e;
    --primary: #0078d4;
    --border: #444;
}

body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
}

    body.light-theme {
        --bg: #fff;
        --text: #333;
        --card: #f3f3f3;
        --border: #ddd;
    }

.header {
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--bg);
}

.nav .nav-item {
    color: var(--text);
    text-decoration: none;
    font-size: 1rem;
    margin-right: 1rem;
}

.nav-item.active {
    font-weight: 600;
}

.toggle {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text);
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
    text-align: center;
}

h1 {
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

.description {
    
    color: var(--text);
    opacity: 0.8;
}

.controls {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--card);
    color: var(--text);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    transition: background 0.2s ease;
}

.primary {
    background: rgb(172, 153, 234);
    color: #fff;
}

    .primary:hover {
        background: rgb(239 153 221);
    }

hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 1.5rem 0;
}


.cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    justify-items: center;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 6px;
    width: 100%;
    max-width: 360px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-align: left;
}

.card-content h2 {
    margin: 0 0 0.5rem;
    color: rgb(225, 225, 225);
    font-size: 1.25rem;
}

.card-content p {
    margin: 0 0 1rem;
    color: var(--text);
    opacity: 0.9;
}

.card-btn {
    align-self: stretch;
    color: rgb(36 36 36);
}

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