:root {
    --primary-color: #007c91;
    --secondary-color: #222;
    --text-color: #222;
    --bg-color: #ffffff;
    --light-bg: #f4f4f4;
    --font-main: Arial, sans-serif;
    --spacing: 20px;
    --radius: 10px;
}

body {
    margin: 0;
    font-family: var(--font-main);
    background: var(--light-bg);
    color: var(--text-color);
}

header {
    background: var(--secondary-color);
    color: white;
    padding: 20px;
}

.container {
    width: 90%;
    margin: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
}

nav ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 0;
    margin: 0;
    list-style: none;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 12px 20px;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    min-height: 44px;
}

nav a:hover {
    color: var(--primary-color);
}

.layout {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 20px;
}

main,
aside {
    background: white;
    padding: 20px;
    border-radius: var(--radius);
}

.cards {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.card {
    display: flex;
    flex-direction: column;
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: transform 0.2s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card img {
    width: 100%;
    height: auto;
}

.card-content {
    padding: 15px;
}

.card-content h3 {
    margin: 0 0 10px;
}

.card-content p {
    color: #444;
}

.btn {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    margin-top: 10px;
    padding: 12px 20px;
    font-size: 16px;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
}

footer {
    background: var(--secondary-color);
    color: white;
    padding: var(--spacing);
    border-top: 3px solid var(--primary-color);
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
    text-align: center;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: white;
    padding: 10px;
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--primary-color);
}

@media (min-width: 768px) {
    .container {
        flex-direction: row;
        justify-content: space-between;
    }

    nav ul {
        flex-direction: row;
        gap: 20px;
    }

    .layout {
        flex-direction: row;
        align-items: flex-start;
    }

    main {
        flex: 3;
    }

    aside {
        flex: 1;
    }

    .cards {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .card {
        flex: 1 1 250px;
        max-width: 300px;
    }

    .footer-container {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }

    .footer-links {
        flex-direction: row;
        gap: 20px;
    }
}