:root {
    --bs-primary: #111111;
    --bs-secondary: #3d3d3d;
    --bs-info: #5d5d5d;
    --bs-success: #1f1f1f;
}

body {
    font-family: 'Roboto', sans-serif;
    scroll-behavior: smooth;
    background-color: #f4f4f4;
    color: #1c1c1c;
}

.navbar-brand,
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
}

.toc {
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    font-size: .95rem;
}

.toc .nav-link {
    color: #333;
}

.toc .nav-link:hover {
    color: #000;
}

.session-header {
    background: linear-gradient(135deg, #050505, #1e1e1e);
    color: #fff;
    padding: 2rem;
    border-radius: .5rem;
    margin-bottom: 2rem;
}

.learning-objective {
    background-color: #ffffff;
    border-left: 4px solid #111;
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.highlight-card {
    border: none;
    border-left: 4px solid #3d3d3d;
    transition: transform .2s;
}

.highlight-card:hover {
    transform: translateY(-2px);
}

.concept-box {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: .375rem;
    padding: 1rem;
    margin: 1rem 0;
}

.code-example {
    background-color: #2d2d2d;
    border: 1px solid #3d3d3d;
    border-radius: .375rem;
    padding: 0;
    margin: 1rem 0;
    font-family: 'Source Code Pro', monospace;
    overflow-x: auto;
}

.code-example pre {
    margin: 0;
    padding: 1rem;
}

.code-example code {
    font-family: 'Source Code Pro', monospace;
    font-size: 0.9rem;
}

footer {
    background-color: #050505;
    color: #fff;
    padding: 2rem 0;
    margin-top: 3rem;
}

.navbar-dark.bg-primary {
    background-color: #050505 !important
}

.diagram-box {
    background: #fff;
    border: 1px solid #e5e5e5;
    border-radius: .5rem;
    padding: 1.5rem;
    margin: 1rem 0;
}

.diagram-box svg {
    width: 100%;
    height: auto;
}