* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    max-width: 1200px;
    height: 100%;
    overflow-x: hidden;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 2rem;
}

.page-content {
    display: flex;
    flex-grow: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

main.content {
    flex: 1;
    padding-right: 1rem;
}

nav.sidebar {
    width: 220px;
    border-left: 1px solid #ccc;
    padding-left: 1rem;
}

nav.sidebar ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

nav.sidebar li {
    margin-bottom: 1rem;
}

nav.sidebar a {
    color: #666666;
    text-decoration: none;
    font-weight: 600;
}

nav.sidebar a:hover {
    text-decoration: underline;
}

img.logo {
    width: 300px;
    display: block;
    margin-bottom: 1rem;
}

footer.footer {
    text-align: center;
    margin-top: 4rem;
    font-size: 0.9rem;
    color: #666;
}

input, textarea {
    width: 100%;
    padding: 0.8rem;
    margin: 0.5rem 0;
    font-size: 1rem;
}
button {
    padding: 0.8rem 1.2rem;
    font-size: 1rem;
    cursor: pointer;
}
.success, .error {
    margin-top: 1rem;
    font-weight: bold;
}
.success { color: green; }
.error { color: red; }