body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    background: #f4f4f4;
}

img {
    width: 100%;
    height: auto;
    display: block;
    max-width: 100vw;
}
.navbar {
    background: #222;
    padding: 0 20px;
}
.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
}
.nav-list > li {
    position: relative;
}
.nav-list > li > a {
    display: block;
    color: #fff;
    padding: 18px 22px;
    text-decoration: none;
    transition: background 0.2s;
}
.nav-list > li > a:hover {
    background: #444;
}
.dropdown-content {
    display: none;
    position: absolute;
    background: #333;
    min-width: 180px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    z-index: 1100;
    top: 100%;
    left: 0;
}
.dropdown:hover .dropdown-content {
    display: block;
}
.dropdown-content li a {
    color: #fff;
    padding: 12px 16px;
    display: block;
    text-decoration: none;
}
.dropdown-content li a:hover {
    background: #444;
}
.container {
    max-width: 900px;
    margin: 40px auto;
    background: #fff;
    padding: 32px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}