* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #667eea, #764ba2);

    display: flex;
    justify-content: center;
    align-items: center;

    padding: 30px;
}

.auth-card {
    width: 420px;
    background: white;
    padding: 40px;

    border-radius: 18px;

    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.25);
}

.logo {
    text-align: center;
    font-size: 40px;
    margin-bottom: 8px;
}

.auth-card h2 {
    text-align: center;
    margin: 0 0 8px;
    color: #222;
}

.subtitle {
    text-align: center;
    color: #777;
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 18px;
}

label {
    display: block;
    margin-bottom: 7px;

    font-weight: bold;
    color: #333;
}

input {
    width: 100%;
    padding: 13px;

    border: 1px solid #ddd;
    border-radius: 8px;

    font-size: 15px;
}

input:focus {
    outline: none;
    border-color: #667eea;

    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.15);
}

.auth-button {
    width: 100%;
    padding: 13px;

    border: none;
    border-radius: 8px;

    background: #667eea;
    color: white;

    font-size: 16px;
    font-weight: bold;

    cursor: pointer;

    transition: 0.2s;
}

.auth-button:hover {
    background: #5568d8;
    transform: translateY(-1px);
}

.error {
    background: #ffe5e5;
    color: #c0392b;

    padding: 10px;
    border-radius: 7px;

    margin-bottom: 20px;
    text-align: center;
}

.success {
    background: #e8f5e9;
    color: #2e7d32;

    padding: 10px;
    border-radius: 7px;

    margin-bottom: 20px;
    text-align: center;
}

.auth-link {
    text-align: center;
    margin-top: 25px;
    color: #666;
}

.auth-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: bold;
}

.auth-link a:hover {
    text-decoration: underline;
}

@media (max-width: 520px) {

    body {
        padding: 15px;
    }

    .auth-card {
        width: 100%;
        padding: 30px 25px;
    }
}