/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    padding: 40px 20px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.logo h1 {
    font-size: 2rem;
    color: #667eea;
    margin-bottom: 10px;
}

.tagline {
    font-size: 1rem;
    color: #666;
    font-style: italic;
}

/* Main Content */
main {
    background: white;
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    min-height: 300px;
}

/* Loading Spinner */
#loading {
    text-align: center;
    padding: 60px 20px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Features Grid */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature {
    text-align: center;
    padding: 20px;
    border-radius: 10px;
    background: #f8f9fa;
    transition: transform 0.3s ease;
}

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

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

.feature h3 {
    color: #667eea;
    margin-bottom: 10px;
}

.feature p {
    color: #666;
    font-size: 0.9rem;
}

/* Artifact Content */
#artifact-content {
    animation: fadeIn 0.5s ease;
}

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

.artifact-header {
    border-bottom: 2px solid #667eea;
    padding-bottom: 20px;
    margin-bottom: 30px;
}

.artifact-header h2 {
    color: #667eea;
    font-size: 2rem;
    margin-bottom: 10px;
}

.artifact-meta {
    color: #666;
    font-size: 0.9rem;
}

.artifact-section {
    margin-bottom: 30px;
}

.artifact-section h3 {
    color: #764ba2;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.artifact-section p {
    color: #555;
    line-height: 1.8;
}

/* Download Section */
.download-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.download-section h2 {
    color: #667eea;
    margin-bottom: 15px;
}

.download-section p {
    color: #666;
    margin-bottom: 30px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.download-btn img {
    height: 60px;
    transition: transform 0.3s ease;
}

.download-btn:hover img {
    transform: scale(1.05);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 20px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    color: #666;
}

.footer-links {
    margin-top: 15px;
}

.footer-links a {
    color: #667eea;
    text-decoration: none;
    margin: 0 15px;
    font-size: 0.9rem;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    header {
        padding: 30px 15px;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    main {
        padding: 25px;
    }

    .features {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .download-btn img {
        height: 50px;
    }
}

/* Alert/Notice Box */
.notice {
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: 10px;
    padding: 15px;
    margin: 20px 0;
    color: #856404;
}

.notice strong {
    display: block;
    margin-bottom: 5px;
}