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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.container {
    width: 100%;
    max-width: 500px;
}

.card {
    background: white;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #1976d2;
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: #333;
    font-size: 0.95rem;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    border: 1px solid #000;
    border-radius: 4px;
    background: #fff;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #90caf9;
    box-shadow: 0 0 0 3px rgba(144, 202, 249, 0.2);
}

.btn {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    color: #1976d2;
    background: #e3f2fd;
    border: 1px solid #000;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
}

.btn:hover {
    background: #bbdefb;
}

.btn:active {
    transform: translateY(1px);
}

.error-message {
    color: #d32f2f;
    background: #ffebee;
    border: 1px solid #000;
    border-radius: 4px;
    padding: 0.75rem;
    margin: 1rem 0;
    font-size: 0.9rem;
}

.result-label {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #e3f2fd;
    border: 1px solid #000;
    border-radius: 4px;
}

.result-label strong {
    color: #1976d2;
    display: block;
    margin-bottom: 0.5rem;
}

.result-label p {
    color: #333;
    line-height: 1.5;
    margin: 0;
}

.logout-link {
    margin-top: 1.5rem;
    text-align: center;
}

.logout-link a {
    color: #1976d2;
    text-decoration: none;
    font-size: 0.9rem;
}

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

@media (min-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .card {
        padding: 2.5rem;
    }
}