body {
    background-color: #f8f9fa;
    color: #212529;
    line-height: 1.8;
}

.navbar {
    background-color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,.08);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: #0d6efd;
}

.main-container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: #ffffff;
    box-shadow: 0 0 20px rgba(0,0,0,.05);
}

.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}

    .page-header h1 {
        font-weight: 700;
        font-size: 2.5rem;
        margin-bottom: 10px;
    }

    .page-header p {
        font-size: 1.1rem;
        opacity: 0.95;
    }

.content-section {
    padding: 60px 40px;
}

.chapter {
    margin-bottom: 50px;
    font-family: 'Roboto', sans-serif;
}

.chapter-title {
    font-weight: 700;
    font-size: 1.75rem;
    color: #1a1a1a;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid #667eea;
}

.chapter-content h3 {
    font-weight: 600;
    font-size: 1.3rem;
    color: #2c3e50;
    margin-top: 30px;
    margin-bottom: 15px;
}

.chapter-content p {
    margin-bottom: 0px;
    color: #495057;
}

.chapter-content ul, .chapter-content ol {
    margin-bottom: 20px;
    padding-left: 30px;
}

.chapter-content li {
    margin-bottom: 10px;
    color: #495057;
}

.chapter-content strong {
    color: #1a1a1a;
    font-weight: 600;
}

.table-wrapper {
    overflow-x: auto;
    margin: 30px 0;
}

.table {
    margin-bottom: 30px;
}

    .table thead th {
        background-color: #667eea;
        color: white;
        font-weight: 600;
        border: none;
    }

    .table tbody tr:hover {
        background-color: #f8f9fa;
    }

.highlight-box {
    background: linear-gradient(135deg, #fff3cd 0%, #ffe69c 100%);
    border-left: 6px solid #ff9800;
    padding: 25px;
    margin: 30px 0;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.15);
}

    .highlight-box strong {
        color: #cc6600;
        font-size: 1.05em;
    }

.info-box {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border-left: 6px solid #2196f3;
    padding: 20px;
    margin: 25px 0;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(33, 150, 243, 0.1);
}

    .info-box strong {
        color: #0d47a1;
    }



.contact-box {
    background-color: #e7f3ff;
    border: 2px solid #667eea;
    padding: 30px;
    margin: 25px 0;
    border-radius: 8px;
    text-align: center;
}

    .contact-box h3 {
        color: #667eea;
        margin-bottom: 20px;
    }

    .contact-box p {
        margin-bottom: 10px;
        font-size: 1.1rem;
    }

    .contact-box a {
        color: #667eea;
        font-weight: 600;
        text-decoration: none;
    }

        .contact-box a:hover {
            text-decoration: underline;
        }

footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
}

    footer p {
        margin: 0;
        font-size: 0.95rem;
    }

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

    .content-section {
        padding: 40px 20px;
    }

    .chapter-title {
        font-size: 1.5rem;
    }
}