* {
    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;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1em;
    opacity: 0.9;
}

main {
    padding: 40px;
}

section {
    margin-bottom: 40px;
}

h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.8em;
}

.info-card {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
}

.info-card p {
    font-size: 1.1em;
    margin-bottom: 20px;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 30px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2.5em;
    font-weight: bold;
    color: #667eea;
}

.stat-label {
    font-size: 0.9em;
    color: #666;
    margin-top: 5px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.feature-card {
    background: white;
    border: 2px solid #e0e0e0;
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.2);
    border-color: #667eea;
}

.icon {
    font-size: 3em;
    display: block;
    margin-bottom: 15px;
}

.feature-card h3 {
    color: #333;
    margin-bottom: 10px;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

.interactive {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 15px;
}

.demo-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    max-width: 400px;
    margin: 0 auto;
}

input[type="text"] {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1em;
    transition: border-color 0.3s;
}

input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
}

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 10px;
    font-size: 1em;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

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

#greeting {
    font-size: 1.2em;
    color: #667eea;
    font-weight: bold;
    min-height: 30px;
}

footer {
    background: #f8f9fa;
    padding: 20px;
    text-align: center;
    color: #666;
    border-top: 1px solid #e0e0e0;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .subtitle {
        font-size: 0.9em;
    }

    main {
        padding: 20px;
    }

    .stats {
        flex-direction: column;
        gap: 20px;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }
}