body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: #333;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    width: 90%;
}

h1 {
    text-align: center;
    color: #4a5568;
    margin-bottom: 30px;
    font-size: 2.5em;
}

.section {
    margin-bottom: 30px;
}

h2 {
    color: #2d3748;
    margin-bottom: 15px;
    font-size: 1.5em;
}

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

input {
    padding: 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

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

button {
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: transform 0.2s;
}

button:hover {
    transform: translateY(-2px);
}

#password-display, #add-message {
    margin-top: 15px;
    padding: 10px;
    border-radius: 8px;
    text-align: center;
    font-weight: bold;
}

#password-display {
    background: #e6fffa;
    color: #2f855a;
    border: 1px solid #9ae6b4;
}

#add-message {
    background: #fefcbf;
    color: #744210;
    border: 1px solid #f6e05e;
}

.error {
    background: #fed7d7;
    color: #c53030;
    border: 1px solid #feb2b2;
}