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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
}

h1 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: #333;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #555;
}

input {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1.25rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input:focus {
    outline: none;
    border-color: #4a90e2;
}

button {
    width: 100%;
    padding: 0.75rem;
    background: #4a90e2;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: #357abd;
}

button:disabled {
    background: #aaa;
    cursor: not-allowed;
}

#message {
    margin-top: 1rem;
    text-align: center;
    font-weight: 600;
}

.success {
    color: #28a745;
}

.error {
    color: #dc3545;
}