body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #6EE7B7, #3B82F6);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: #333;
}

.container {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 500px;
    text-align: center;
}

.form-group {
    margin-bottom: 1rem;
}

input {
    width: 100%;
    padding: 0.75rem;
    margin: 0.5rem 0;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

button {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    margin: 0.5rem 0;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s;
}

button:hover {
    background: #45a049;
}

#result {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 5px;
}

#shortUrl {
    color: #3182ce;
    word-break: break-all;
    display: block;
    margin: 0.5rem 0;
}

.hidden {
    display: none;
}

.error-message {
    color: #e53e3e;
    margin-top: 1rem;
}