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

body {
    display: block;
    font-family: 'Segoe UI', sans-serif;
    background-color: #f4f4f4;
    color: #1f2937;
}

.site-header {
    width: 100%;
    background-color: #fff;
    border-bottom: 1px solid #ddd;
    position: sticky;
    top: 0;
    z-index: 999;
    margin-bottom: 30px;
}

.header-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 10px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo img {
    height: 40px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 15px;
    padding: 0;
    margin: 0;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: #007bff;
}

.nav-button {
    padding: 8px 14px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    white-space: nowrap;
}

.nav-button:hover {
    background-color: #0056b3;
}

.hamburger {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

.hidden {
    display: none;
}

@media (max-width: 768px) {
    .nav {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 60px;
        right: 20px;
        padding: 15px;
        border: 1px solid #ddd;
        border-radius: 8px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    }

    .nav.active {
        display: flex;
    }

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

    .hamburger {
        display: block;
    }
}