* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: #f5f5f5;
    color: #222;
    line-height: 1.6;
}

header {
    background-color: #1a1a1a;
    color: #fff;
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
}

header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

header nav .logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #f39c12;
}

header nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 1rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

header nav a:hover {
    color: #f39c12;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 2rem;
    padding: 2rem;
}

aside {
    background-color: #fff;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

aside h2 {
    color: #f39c12;
    margin-bottom: 1rem;
}

aside p a {
    color: #1a1a1a;
    text-decoration: none;
    transition: color 0.3s;
}

aside p a:hover {
    color: #f39c12;
}

article {
    background-color: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 6px 15px rgba(0,0,0,0.1);
}

article h1 {
    color: #c0392b;
    margin-bottom: 1rem;
}

article h2 {
    color: #f39c12;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

article p {
    margin-bottom: 1rem;
    font-size: 1rem;
}

article img {
    width: 100%;
    border-radius: 10px;
    margin-bottom: 1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

article img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

form {
    display: grid;
    gap: 1rem;
    margin-top: 1.5rem;
}

form label {
    display: flex;
    flex-direction: column;
    font-weight: 500;
}

form input, form textarea {
    padding: 0.7rem;
    border-radius: 5px;
    border: 1px solid #ccc;
    font-size: 1rem;
    width: 100%;
    transition: border 0.3s, box-shadow 0.3s;
}

form input:focus, form textarea:focus {
    border-color: #f39c12;
    box-shadow: 0 0 5px rgba(243, 156, 18, 0.5);
    outline: none;
}

form input:required {
    border: 2px solid red;
}

button {
    padding: 0.8rem;
    background-color: #c0392b;
    color: #fff;
    font-weight: bold;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s ease;
}

button:hover {
    background-color: #e74c3c;
}

footer {
    background-color: #1a1a1a;
    color: #fff;
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
}

footer a {
    color: #f39c12;
    text-decoration: none;
    margin: 0 0.5rem;
}

footer a:hover {
    color: #fff;
}

iframe {
    border-radius: 10px;
    margin-top: 1rem;
}

@media (max-width: 640px) {
    .main-grid {
        grid-template-columns: 1fr;
        padding: 1rem;
    }

    header nav {
        flex-direction: column;
        align-items: flex-start;
    }

    header nav a {
        margin: 0.5rem 0;
    }

    aside {
        margin-bottom: 2rem;
    }
}