* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'PingFang SC', Arial, sans-serif;
}

body {
    background: #f5f5f5;
    color: #333;
}

header {
    text-align: center;
    padding: 30px 20px;
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
}

header h1 {
    font-size: 28px;
    font-weight: 500;
    margin-bottom: 8px;
}

header p {
    font-size: 16px;
    color: #666;
}

main {
    max-width: 640px;
    margin: 20px auto;
    padding: 0 20px;
}

form {
    background: #fff;
    padding: 15px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
}

input {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 14px;
    background: transparent;
    color: #333;
}

input:focus {
    outline: none;
    border-color: #007bff;
}

button {
    width: 100%;
    padding: 10px;
    background: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: #0056b3;
}

.error {
    color: #dc3545;
    text-align: center;
    margin: 8px 0;
    font-size: 14px;
}

.success {
    color: #28a745;
    text-align: center;
    margin: 8px 0;
    font-size: 14px;
}

.buttons {
    margin-top: 15px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.button {
    padding: 8px 16px;
    background: #6c757d;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    font-size: 14px;
    transition: background 0.2s;
}

.button:hover {
    background: #5a6268;
}

footer {
    text-align: center;
    padding: 15px;
    margin-top: 20px;
    background: #fff;
    border-top: 1px solid #e0e0e0;
}

footer p {
    margin: 4px 0;
    font-size: 12px;
    color: #666;
}

footer a {
    color: #007bff;
    text-decoration: none;
}

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

@media (max-width: 768px) {
    header {
        padding: 15px 10px;
    }

    header h1 {
        font-size: 24px;
    }

    header p {
        font-size: 14px;
    }

    main {
        padding: 0 10px;
    }

    form {
        padding: 10px;
    }

    input, button {
        font-size: 13px;
    }

    .button {
        font-size: 13px;
        padding: 6px 12px;
    }
}