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

body, html {
    width: 100%;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}

.home-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.home-content {
    text-align: center;
    color: white;
    padding: 2rem;
    animation: fadeIn 0.8s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo {
    width: 120px;
    height: 120px;
    margin-bottom: 2rem;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.3));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.2rem;
    margin-bottom: 3rem;
    opacity: 0.95;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

.demo-buttons {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

.demos-title {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    font-weight: 600;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

.button-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.demo-card {
    position: relative;
}

.demo-button {
    width: 100%;
    background: white;
    color: #667eea;
    border: none;
    padding: 2rem 1.5rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
}

.demo-button:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    background: #f8f9fa;
}

.demo-button:active {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.button-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.button-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: #667eea;
}

.button-description {
    font-size: 0.9rem;
    color: #888;
    font-weight: 400;
}

.viewer-button {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
    padding: 1rem 3rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.viewer-button:hover {
    background: white;
    color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.viewer-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.viewer-button.default-viewer {
    margin-top: 1rem;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .logo {
        width: 80px;
        height: 80px;
    }

    .demos-title {
        font-size: 1.4rem;
        margin-bottom: 1.5rem;
    }

    .button-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-bottom: 2rem;
    }

    .demo-button {
        padding: 1.5rem 1rem;
    }

    .button-icon {
        font-size: 2.5rem;
    }

    .button-title {
        font-size: 1.1rem;
    }

    .button-description {
        font-size: 0.85rem;
    }

    .home-content {
        padding: 1rem;
    }

    .home-container {
        overflow-y: auto;
        align-items: flex-start;
        padding-top: 2rem;
    }
}