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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

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

.card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    color: #333;
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-align: center;
}

.subtitle {
    color: #666;
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

input[type="text"] {
    flex: 1;
    padding: 15px 20px;
    font-size: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    outline: none;
    transition: all 0.3s ease;
}

input[type="text"]:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

button {
    padding: 15px 30px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

button:active {
    transform: translateY(0);
}

.result {
    margin-top: 30px;
    padding: 25px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 15px;
    text-align: center;
    transition: all 0.4s ease;
    opacity: 0;
    transform: scale(0.9);
}

.result.hidden {
    display: none;
}

.result.show {
    display: block;
    opacity: 1;
    transform: scale(1);
    animation: popIn 0.4s ease-out;
}

@keyframes popIn {
    0% {
        opacity: 0;
        transform: scale(0.8);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.result-label {
    color: #555;
    font-size: 1rem;
    margin-bottom: 10px;
}

#originalName {
    font-weight: 600;
    color: #667eea;
}

.nickname {
    font-size: 2.5rem;
    font-weight: 700;
    color: #764ba2;
    margin-top: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

@media (max-width: 600px) {
    .card {
        padding: 30px 20px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    button {
        width: 100%;
    }
    
    .nickname {
        font-size: 2rem;
    }
}