body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    line-height: 1.6;
    background: #fafafa;
}
header, footer {
    background: #fff;
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 5px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
nav a {
    margin-right: 10px;
    text-decoration: none;
    color: #0066cc;
}
main {
    background: #fff;
    padding: 1rem;
    border-radius: 5px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
h1, h2, h3 {
    color: #333;
}
.error {
    color: #d32f2f;
    background: #ffebee;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
}
.success {
    color: #388e3c;
    background: #e8f5e9;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
}
button, .button {
    background: #0066cc;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
button:hover, .button:hover {
    background: #004499;
}
.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 10px;
}

.banner {
    flex-shrink: 0;
}

/* Для мобильных: если баннер не влезает, переносим его под заголовок */
@media (max-width: 768px) {
    .header-top {
        flex-direction: column;
        text-align: center;
    }
}