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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: white;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #333;
}

.container {
    text-align: center;
    max-width: 600px;
    padding: 40px;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 60px;
    line-height: 1.2;
}

#check-button {
    font-size: 1.5rem;
    font-weight: 600;
    padding: 20px 60px;
    background: white;
    color: #667eea;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

#check-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.3);
    background: #f8f9ff;
}

#check-button:active {
    transform: translateY(0);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

#check-button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

#result {
    margin-top: 40px;
}

#answer {
    font-size: 2.5rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 20px;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#expand-button {
    font-size: 1rem;
    padding: 10px 20px;
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

#expand-button:hover {
    background: #667eea;
    color: white;
}

#full-response {
    background: #f8f9fa;
    color: #333;
    padding: 20px;
    border-radius: 15px;
    text-align: left;
    line-height: 1.6;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border: 1px solid #e9ecef;
    margin-top: 20px;
}

.hidden {
    display: none;
}

.loading {
    opacity: 0.7;
}

.loading::after {
    content: '...';
    animation: dots 1.5s infinite;
}

@keyframes dots {
    0%, 20% { content: ''; }
    40% { content: '.'; }
    60% { content: '..'; }
    80%, 100% { content: '...'; }
}