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

body {
    font-family: Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    background: #e8e8e8;
    color: #222;
}

.page {
    max-width: 760px;
    margin: 40px auto;
    background: #fff;
    border: 1px solid #bbb;
    padding: 28px 32px;
}

h1 {
    font-size: 20px;
    font-weight: bold;
    border-bottom: 1px solid #ddd;
    padding-bottom: 8px;
    margin-bottom: 16px;
}

nav {
    margin-bottom: 20px;
}

nav a {
    margin-right: 14px;
    color: #0055aa;
    text-decoration: none;
    font-size: 13px;
}

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

p {
    margin-bottom: 12px;
}

a {
    color: #0055aa;
}

a:hover {
    text-decoration: underline;
}

.error {
    background: #fff0f0;
    border: 1px solid #cc0000;
    color: #990000;
    padding: 8px 12px;
    margin-bottom: 16px;
    font-size: 13px;
}

.form-group {
    margin-bottom: 14px;
}

label {
    display: block;
    font-weight: bold;
    margin-bottom: 4px;
    font-size: 13px;
}

input[type="text"],
input[type="email"] {
    width: 100%;
    max-width: 340px;
    padding: 5px 7px;
    border: 1px solid #aaa;
    font-family: Arial, sans-serif;
    font-size: 14px;
    background: #fafafa;
}

input[type="text"]:focus,
input[type="email"]:focus {
    outline: none;
    border-color: #0055aa;
    background: #fff;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-bottom: 14px;
}

.checkbox-group label {
    font-weight: normal;
    margin-bottom: 0;
}

input[type="submit"] {
    background: #ddd;
    border: 1px solid #aaa;
    border-bottom-color: #888;
    padding: 5px 18px;
    font-family: Arial, sans-serif;
    font-size: 13px;
    cursor: pointer;
}

input[type="submit"]:hover {
    background: #ccc;
}

input[type="submit"]:active {
    background: #bbb;
}

footer {
    margin-top: 28px;
    padding-top: 10px;
    border-top: 1px solid #e8e8e8;
    color: #999;
    font-size: 12px;
}