/* Reset and base styles */
* {
    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;
    align-items: center;
    justify-content: center;
    color: #333;
}

.container {
    max-width: 800px;
    width: 90%;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    overflow: hidden;
    animation: fadeInUp 0.8s ease-out;
}

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

.content {
    padding: 60px 40px;
    text-align: center;
}

.main-title {
    font-size: 4rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 40px;
    opacity: 0;
    animation: fadeIn 1s ease-out 0.5s forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.interactive-section {
    margin: 40px 0;
}

.hello-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
    margin-bottom: 20px;
}

.hello-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(102, 126, 234, 0.4);
}

.hello-btn:active {
    transform: translateY(-1px);
}

.message {
    min-height: 30px;
    font-size: 1.1rem;
    color: #667eea;
    font-weight: 600;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.message.show {
    opacity: 1;
}

.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.card {
    background: rgba(255, 255, 255, 0.8);
    padding: 30px 20px;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.card:hover {
    transform: translateY(-5px);
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #667eea;
}

.card p {
    color: #666;
    line-height: 1.5;
}

.footer {
    background: rgba(102, 126, 234, 0.1);
    padding: 20px;
    text-align: center;
    color: #666;
    font-size: 0.9rem;
}

/* Responsive design */
@media (max-width: 768px) {
    .content {
        padding: 40px 20px;
    }
    
    .main-title {
        font-size: 2.5rem;
    }
    
    .info-cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
}