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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
    min-height: 100vh;
}

.part-header {
    background: white;
    border-radius: 10px 10px 0 0;
    padding: 30px 40px;
    max-width: 1000px;
    margin: 0 auto;
    box-shadow: 0 -5px 20px rgba(0,0,0,0.1);
    border-bottom: 4px solid #667eea;
}

.part-number {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.9em;
    margin-bottom: 15px;
}

.part-header h1 {
    color: #667eea;
    font-size: 2.5em;
    margin-bottom: 15px;
}

.part-meta {
    display: flex;
    gap: 20px;
    color: #666;
    font-size: 1.1em;
}

.part-meta span {
    display: flex;
    align-items: center;
    gap: 8px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.section {
    margin-bottom: 40px;
}

.section h2 {
    color: #764ba2;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e0e0e0;
    font-size: 1.8em;
}

.section h3 {
    color: #667eea;
    margin: 25px 0 15px 0;
    font-size: 1.4em;
}

.section h4 {
    color: #333;
    margin: 20px 0 10px 0;
    font-size: 1.2em;
}

.section ul,
.section ol {
    margin-left: 25px;
    margin-top: 15px;
}

.section li {
    margin-bottom: 12px;
    line-height: 1.8;
}

.section p {
    margin-bottom: 15px;
    line-height: 1.8;
}

.innovation-card {
    background: #f5f5f5;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border-left: 4px solid #667eea;
}

.innovation-card h4 {
    color: #667eea;
    margin-bottom: 12px;
    font-size: 1.3em;
}

.activity-box {
    background: #e3f2fd;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid #2196f3;
}

.demo-section {
    background: #f3e5f5;
    padding: 25px;
    border-radius: 8px;
    margin: 25px 0;
    border-left: 4px solid #9c27b0;
    text-align: center;
}

.demo-section h3 {
    margin-top: 0;
    margin-bottom: 15px;
}

.demo-button {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    margin: 10px 5px;
    transition: all 0.3s;
}

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

.discussion-box {
    background: #fce4ec;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid #e91e63;
}

.discussion-box h3 {
    color: #c2185b;
    margin-top: 0;
}

.highlight-box {
    background: #fff3cd;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid #ffc107;
}

.key-takeaways {
    background: #e8f5e9;
    padding: 25px;
    border-radius: 8px;
    margin-top: 30px;
    border-left: 4px solid #4caf50;
}

.key-takeaways h3 {
    color: #2e7d32;
    margin-top: 0;
    margin-bottom: 15px;
}

.key-takeaways ul {
    margin-left: 20px;
}

.key-takeaways li {
    margin-bottom: 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th,
td {
    padding: 12px;
    text-align: left;
    border: 1px solid #ddd;
}

th {
    background: #667eea;
    color: white;
    font-weight: 600;
}

tr:nth-child(even) {
    background: #f9f9f9;
}

blockquote {
    background: #f9f9f9;
    border-left: 4px solid #667eea;
    padding: 20px;
    margin: 20px 0;
    font-style: italic;
    font-size: 1.1em;
}

.part-navigation {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    padding: 25px 40px;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.nav-spacer {
    flex: 1;
}

.nav-btn {
    display: inline-block;
    padding: 12px 25px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    font-size: 1em;
}

.btn-home {
    background: #f5f5f5;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-home:hover {
    background: #667eea;
    color: white;
}

.btn-prev {
    background: #f5f5f5;
    color: #764ba2;
    border: 2px solid #764ba2;
}

.btn-prev:hover {
    background: #764ba2;
    color: white;
}

.btn-next {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

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

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .part-header,
    .container,
    .part-navigation {
        padding: 20px;
    }

    .part-header h1 {
        font-size: 1.8em;
    }

    .part-navigation {
        flex-direction: column;
    }

    .nav-spacer {
        display: none;
    }

    .nav-btn {
        width: 100%;
        text-align: center;
    }
}