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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.card {
    background: white;
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

h1 {
    color: #333;
    margin-bottom: 30px;
    font-size: 24px;
    text-align: center;
}

.subtitle {
    color: #666;
    text-align: center;
    margin: 10px 0 20px 0;
    font-style: italic;
}

form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

input {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
}

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

button, .btn {
    padding: 12px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

button:hover, .btn:hover {
    background: #5568d3;
}

.btn-secondary {
    background: #6c757d;
}

.btn-secondary:hover {
    background: #5a6268;
}

.error {
    color: #dc3545;
    font-size: 14px;
    display: none;
}

.error.show {
    display: block;
}

.actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 20px;
}

.back-link {
    display: block;
    text-align: center;
    margin-top: 20px;
    color: #667eea;
    text-decoration: none;
}

.back-link:hover {
    text-decoration: underline;
}

#username {
    color: #667eea;
}