.lesson-detail {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, rgba(67, 97, 238, 0.03) 100%);
    min-height: 100vh;
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.lesson-detail::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 150%;
    background: radial-gradient(circle at 50% 0%, rgba(67, 97, 238, 0.08), transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.lesson-content {
    position: relative;
    z-index: 1;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 30px;
    padding: 60px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(67, 97, 238, 0.12);
    max-width: 900px;
    margin: 0 auto;
}

.markdown-content {
    line-height: 1.8;
    color: #374151;
    font-size: 1.1rem;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

.markdown-content h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin: 0 0 3rem 0;
    padding: 1.8rem 3rem 1.8rem 2rem;
    position: relative;
    line-height: 1.3;
    letter-spacing: -0.03em;
    color: #1e293b;

    /* Glass effect background */
    background: linear-gradient(135deg,
        rgba(255, 255, 255, 0.25) 0%,
        rgba(255, 255, 255, 0.15) 50%,
        rgba(255, 255, 255, 0.1) 100%);

    /* Enhanced glassmorphism blur */
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);

    /* Beautiful glass border with gradient */
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 20px;

    /* Multi-layered glass shadows */
    box-shadow:
        /* Outer glow */
        0 8px 32px rgba(67, 97, 238, 0.15),
        0 20px 60px rgba(67, 97, 238, 0.1),
        /* Glass reflection */
        inset 0 1px 2px rgba(255, 255, 255, 0.9),
        inset 0 -1px 2px rgba(255, 255, 255, 0.2),
        /* Subtle inner glow */
        inset 0 0 60px rgba(255, 255, 255, 0.05);

    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    padding-left: 1.8rem;
    overflow: hidden;
}

/* Glass shimmer effect */
.markdown-content h1::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.3) 50%,
        transparent 100%
    );
    transition: left 0.7s ease;
    pointer-events: none;
    z-index: 1;
}

.markdown-content h1::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 6px;
    background: linear-gradient(180deg,
        #4361ee 0%,
        #4895ef 40%,
        #4cc9f0 80%,
        #7dd3fc 100%);
    border-radius: 20px 0 0 20px;
    box-shadow:
        0 0 25px rgba(67, 97, 238, 0.6),
        0 0 50px rgba(72, 149, 239, 0.3),
        inset 1px 0 0 rgba(255, 255, 255, 0.5);
    z-index: 2;
}

.markdown-content h1:hover {
    transform: translateY(-5px) scale(1.01);

    /* Enhanced glass background on hover */
    background: linear-gradient(135deg,
        rgba(255, 255, 255, 0.35) 0%,
        rgba(255, 255, 255, 0.25) 50%,
        rgba(255, 255, 255, 0.2) 100%);

    /* Stronger glass border */
    border: 1px solid rgba(255, 255, 255, 0.6);

    /* Enhanced glow and glass shadows */
    box-shadow:
        /* Stronger outer glow */
        0 12px 48px rgba(67, 97, 238, 0.25),
        0 25px 80px rgba(67, 97, 238, 0.15),
        /* Enhanced glass reflections */
        inset 0 2px 4px rgba(255, 255, 255, 1),
        inset 0 -2px 4px rgba(255, 255, 255, 0.3),
        /* Brighter inner glow */
        inset 0 0 80px rgba(255, 255, 255, 0.08);
}

/* Shimmer animation on hover */
.markdown-content h1:hover::before {
    left: 100%;
}

.markdown-content h1:hover::after {
    box-shadow:
        0 0 35px rgba(67, 97, 238, 0.8),
        0 0 70px rgba(72, 149, 239, 0.5),
        0 0 100px rgba(76, 201, 240, 0.3),
        inset 1px 0 0 rgba(255, 255, 255, 0.8);
}

@keyframes floatIcon {
    0%, 100% {
        transform: translateY(-50%) translateX(0);
    }
    50% {
        transform: translateY(-50%) translateX(3px);
    }
}

.markdown-content h2 {
    font-size: 1.8rem;
    margin: 2rem 0 1.2rem;
    color: var(--dark);
    position: relative;
    padding-left: 1.2rem;
}

.markdown-content h2:before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.4em;
    height: 0.8em;
    width: 5px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
    border-radius: 3px;
}

.markdown-content h3 {
    font-size: 1.5rem;
    margin: 1.8rem 0 1rem;
    color: var(--dark);
    font-weight: 600;
}

.markdown-content h4 {
    font-size: 1.3rem;
    margin: 1.5rem 0 0.8rem;
    color: var(--dark);
    font-weight: 600;
}

.markdown-content h5 {
    font-size: 1.15rem;
    margin: 1.3rem 0 0.7rem;
    color: var(--dark);
    font-weight: 600;
}

.markdown-content h6 {
    font-size: 1.05rem;
    margin: 1.2rem 0 0.6rem;
    color: #6b7280;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.markdown-content p {
    margin-bottom: 1.5em;
    text-align: justify;
    hyphens: auto;
    line-height: 1.9;
}

.markdown-content ul {
    margin-bottom: 1.8em;
    padding-left: 1.8em;
    list-style-type: none;
}

.markdown-content ul li {
    position: relative;
    margin-bottom: 0.6em;
    padding-left: 1.5em;
}

.markdown-content ul li:before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-size: 1.4em;
    line-height: 1;
}

/* Ordered Lists */
.markdown-content ol {
    margin-bottom: 1.8em;
    padding-left: 1.8em;
    counter-reset: item;
    list-style: none;
}

.markdown-content ol li {
    position: relative;
    margin-bottom: 0.6em;
    padding-left: 1.5em;
    counter-increment: item;
}

.markdown-content ol li:before {
    content: counter(item) ".";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
    font-size: 1em;
}

.markdown-content ul ul,
.markdown-content ol ol,
.markdown-content ul ol,
.markdown-content ol ul {
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

.markdown-content code {
    background: #f1f5f9;
    color: #e11d48;
    padding: 0.2em 0.5em;
    border-radius: 4px;
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.9em;
    font-weight: 500;
    border: 1px solid #e2e8f0;
}

.markdown-content pre code {
    background: none;
    color: inherit;
    padding: 0;
    border-radius: 0;
    border: none;
    font-weight: normal;
}

.markdown-content a {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    font-weight: 500;
}

.markdown-content a:hover {
    color: var(--secondary);
    border-bottom-color: var(--accent);
}

.markdown-content strong {
    color: var(--dark);
    font-weight: 700;
}

.markdown-content em {
    font-style: italic;
    color: #4b5563;
}

.markdown-content input[type="checkbox"] {
    margin-right: 0.5em;
    cursor: default;
}

.markdown-content li input[type="checkbox"] {
    margin-left: -1.5em;
}

.markdown-content h1 + p,
.markdown-content h2 + p,
.markdown-content h3 + p,
.markdown-content h4 + p,
.markdown-content h5 + p,
.markdown-content h6 + p {
    margin-top: 0.5em;
}

.markdown-content p + .codehilite,
.markdown-content ul + .codehilite,
.markdown-content ol + .codehilite {
    margin-top: 1.5em;
}

.markdown-content .codehilite + p,
.markdown-content .codehilite + ul,
.markdown-content .codehilite + ol {
    margin-top: 1.5em;
}

.markdown-content del {
    text-decoration: line-through;
    opacity: 0.7;
}

.markdown-content mark {
    background: #fef08a;
    padding: 0.1em 0.3em;
    border-radius: 3px;
}

.markdown-content kbd {
    background: #f3f4f6;
    border: 1px solid #d1d5db;
    border-bottom-width: 2px;
    border-radius: 4px;
    padding: 0.1em 0.5em;
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.1);
}

.markdown-content abbr {
    text-decoration: underline dotted;
    cursor: help;
}

.markdown-content dl {
    margin-bottom: 1.8em;
}

.markdown-content dt {
    font-weight: 700;
    color: var(--dark);
    margin-top: 1em;
}

.markdown-content dd {
    margin-left: 2em;
    margin-bottom: 0.5em;
    color: #6b7280;
}

/* Monaco Editor Code Blocks */
.monaco-code-block {
    position: relative;
    border-radius: 12px;
    margin: 2em 0;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    background: #ffffff;
    border: 1px solid #e5e7eb;
    padding-top: 15px;
}

/* Prevent Monaco from capturing vertical scroll - allows page scrolling over code blocks */
.monaco-code-block .monaco-scrollable-element {
    overflow-y: hidden !important;
}

.monaco-code-block .monaco-editor .overflow-guard {
    overflow: hidden !important;
}

.monaco-editor-container {
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
}

/* Single line code blocks - centered appearance */
.monaco-editor-container.single-line {
    display: flex;
    align-items: center;
    padding-top: 8px;
    padding-bottom: 8px;
}

.monaco-editor-container.two-lines {
    padding-top: 6px;
    padding-bottom: 6px;
}

/* Monaco Copy Button */
.monaco-copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid #cbd5e1;
    color: #64748b;
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 0.9rem;
    width: 36px;
    height: 36px;
    z-index: 10;
    opacity: 0.6;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.monaco-code-block:hover .monaco-copy-btn {
    opacity: 1;
}

.monaco-copy-btn:hover {
    background: rgba(255, 255, 255, 1);
    border-color: #94a3b8;
    color: #475569;
    transform: scale(1.05);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.monaco-copy-btn:active {
    transform: scale(0.95);
}

.monaco-copy-btn.copied {
    background: #10b981;
    border-color: #10b981;
    color: white;
}

/* Dark Mode */
.dark-mode .monaco-code-block {
    background: #1F1F1F !important;
    border: 1px solid #3f3f3f;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.dark-mode .monaco-editor-container {
    background: #1F1F1F !important;
}

.dark-mode .monaco-editor .monaco-editor-background {
    background-color: #1F1F1F !important;
}

.dark-mode .monaco-copy-btn {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.08);
    color: #d4d4d4;
}

.dark-mode .monaco-copy-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.15);
    color: #ffffff;
}

.dark-mode .monaco-copy-btn.copied {
    background: #10b981;
    border-color: #10b981;
    color: white;
}

/* Legacy .codehilite for backwards compatibility */
.codehilite {
    position: relative;
    border-radius: 12px;
    margin: 2em 0;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    background: #f8fafc;
    border: 1px solid #e5e7eb;
    padding-top: 15px;
}

.codehilite .header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(90deg, #2d2d2d, #1a1a1a);
    color: #a0aec0;
    padding: 0.6em 1.2em;
    font-size: 0.85rem;
    font-family: 'Fira Code', monospace;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.codehilite .language {
    font-weight: 600;
    color: #e2e8f0;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.codehilite .copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid #cbd5e1;
    color: #64748b;
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    width: 36px;
    height: 36px;
    z-index: 10;
    opacity: 0.6;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.codehilite:hover .copy-btn {
    opacity: 1;
}

.codehilite .copy-btn:hover {
    background: rgba(255, 255, 255, 1);
    border-color: #94a3b8;
    color: #475569;
    transform: scale(1.05);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.codehilite .copy-btn:active {
    transform: scale(0.95);
}

.codehilite .copy-btn i {
    font-size: 1em;
}

.codehilite pre {
    margin: 0;
    padding: 1.5em;
    overflow-x: auto;
    font-size: 0.95rem;
    line-height: 1.6;
    tab-size: 4;
    font-family: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    background: #1e1e1e;
    color: #d4d4d4;
}

.codehilite {
    background: #ffffff !important;
}

.codehilite pre {
    background: #ffffff;
    color: #000000;
}

.codehilite .k,
.codehilite .kc,
.codehilite .kd,
.codehilite .kn,
.codehilite .kp,
.codehilite .kr,
.codehilite .kt {
    color: #0000ff;
    font-weight: normal;
}

.codehilite .s,
.codehilite .sb,
.codehilite .sc,
.codehilite .s2,
.codehilite .se,
.codehilite .sh,
.codehilite .sx,
.codehilite .sr,
.codehilite .s1,
.codehilite .ss,
.codehilite .sd {
    color: #a31515;
}

.codehilite .c,
.codehilite .ch,
.codehilite .cm,
.codehilite .cp,
.codehilite .cpf,
.codehilite .c1,
.codehilite .cs {
    color: #008000;
    font-style: italic;
}

.codehilite .m,
.codehilite .mb,
.codehilite .mf,
.codehilite .mh,
.codehilite .mi,
.codehilite .mo {
    color: #098658;
}

.codehilite .nf,
.codehilite .fm,
.codehilite .nb {
    color: #795e26;
}

.codehilite .nc,
.codehilite .nn {
    color: #267f99;
}

.codehilite .n,
.codehilite .nv,
.codehilite .vc,
.codehilite .vg,
.codehilite .vi,
.codehilite .vm {
    color: #001080;
}

.codehilite .o,
.codehilite .ow {
    color: #000000;
}

.codehilite .nd {
    color: #795e26;
}

.codehilite .bp {
    color: #0000ff;
}

.codehilite .err {
    color: #f44747;
    background: none;
}

.codehilite .ge {
    font-style: italic;
}

.codehilite .gs {
    font-weight: bold;
}

/* HTML/XML Tags (e.g., <div>, <span>, <?php>) */
.codehilite .nt {
    color: #800000;
    font-weight: 600;
}

/* HTML/XML Attributes (e.g., class="", id="") */
.codehilite .na {
    color: #ff0000;
}

/* Punctuation and brackets (e.g., <, >, =, :) */
.codehilite .p {
    color: #000000;
}

/* String interpolation - Light Mode */
.codehilite .si {
    color: #0000ff;
}

/* Entity names - Light Mode */
.codehilite .ni {
    color: #795e26;
}

/* Exceptions - Light Mode */
.codehilite .ne {
    color: #267f99;
}

/* Labels - Light Mode */
.codehilite .nl {
    color: #000000;
}

/* Other constants - Light Mode */
.codehilite .no {
    color: #0000ff;
}

/* Properties - Light Mode */
.codehilite .py {
    color: #001080;
}

/* Diff inserted - Light Mode */
.codehilite .gi {
    color: #098658;
}

/* Diff deleted - Light Mode */
.codehilite .gd {
    color: #a31515;
}

/* JavaScript/TypeScript specific tokens - Light Mode */
.codehilite .nx {
    color: #001080;
}

/* String affixes (f-strings, r-strings, etc) - Light Mode */
.codehilite .sa {
    color: #a31515;
}

/* Whitespace - Light Mode */
.codehilite .w {
    color: transparent;
}

/* YAML scalars - Light Mode */
.codehilite .l,
.codehilite .l-Scalar,
.codehilite .l-Scalar-Plain {
    color: #a31515;
}

/* YAML indicators - Light Mode */
.codehilite .p-Indicator {
    color: #0000ff;
}

/* Generic heading (markdown) - Light Mode */
.codehilite .gh {
    color: #0000ff;
    font-weight: bold;
}

/* Generic subheading - Light Mode */
.codehilite .gu {
    color: #267f99;
    font-weight: bold;
}

.markdown-content blockquote {
    border-left: 4px solid var(--primary);
    background: linear-gradient(to right, #f8fafc, #ffffff);
    padding: 1.5em;
    margin: 2em 0;
    border-radius: 0 12px 12px 0;
    position: relative;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.03);
}

.markdown-content blockquote:before {
    content: '"';
    position: absolute;
    top: 0;
    left: 10px;
    font-size: 4rem;
    color: rgba(67, 97, 238, 0.1);
    font-family: Georgia, serif;
    line-height: 1;
}

.markdown-content blockquote p {
    position: relative;
    z-index: 1;
    margin: 0;
}

.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 2em 0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    border-radius: 10px;
    overflow: hidden;
}

.markdown-content table th {
    background: linear-gradient(to right, var(--primary), var(--secondary));
    color: white;
    font-weight: 500;
    text-align: left;
}

.markdown-content table th, 
.markdown-content table td {
    padding: 1em 1.2em;
    border: 1px solid #e5e7eb;
}

.markdown-content table tr:nth-child(even) {
    background-color: #f9fafb;
}

.markdown-content table tr:hover {
    background-color: #f0f4f8;
}

.markdown-content hr {
    border: 0;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--primary), transparent);
    margin: 3em 0;
    opacity: 0.3;
}

.markdown-content .callout {
    padding: 1.5em;
    border-radius: 10px;
    margin: 2em 0;
    background: #f0f7ff;
    border-left: 4px solid var(--primary);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.03);
}

.markdown-content .callout.warning {
    background: #fffaf0;
    border-left-color: #f59e0b;
}

.markdown-content .callout.danger {
    background: #fef2f2;
    border-left-color: #ef4444;
}

.dark-mode .lesson-detail {
    background: linear-gradient(180deg, var(--bg-primary) 0%, rgba(72, 149, 239, 0.05) 100%);
}

.dark-mode .lesson-detail::before {
    background: radial-gradient(circle at 50% 0%, rgba(72, 149, 239, 0.12), transparent 50%);
}

.dark-mode .lesson-content {
    background: rgba(26, 35, 50, 0.7);
    border-color: rgba(72, 149, 239, 0.15);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.dark-mode .lesson-navigation {
    border-top-color: rgba(72, 149, 239, 0.15);
}

.dark-mode .btn-outline {
    background: rgba(26, 35, 50, 0.6);
    border-color: rgba(72, 149, 239, 0.3);
    color: #4895ef;
}

.dark-mode .btn-outline:hover {
    background: linear-gradient(135deg, #4895ef, #4cc9f0);
    color: white;
    box-shadow: 0 8px 25px rgba(72, 149, 239, 0.4);
}

.dark-mode .btn-primary {
    background: linear-gradient(135deg, #4895ef, #4cc9f0);
    background-size: 200% 200%;
}

.dark-mode .btn-primary:hover {
    box-shadow: 0 8px 25px rgba(72, 149, 239, 0.5);
}

.dark-mode .markdown-content {
    color: #e5e7eb;
}

.dark-mode .markdown-content h1 {
    color: #f1f5f9;

    /* Dark mode glass effect */
    background: linear-gradient(135deg,
        rgba(30, 41, 59, 0.4) 0%,
        rgba(30, 41, 59, 0.3) 50%,
        rgba(30, 41, 59, 0.2) 100%);

    /* Enhanced dark mode blur */
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);

    /* Dark glass border */
    border: 1px solid rgba(148, 163, 184, 0.2);

    /* Dark mode glass shadows */
    box-shadow:
        /* Outer glow */
        0 8px 32px rgba(72, 149, 239, 0.2),
        0 20px 60px rgba(0, 0, 0, 0.6),
        /* Glass reflections */
        inset 0 1px 2px rgba(255, 255, 255, 0.1),
        inset 0 -1px 2px rgba(255, 255, 255, 0.05),
        /* Inner glow */
        inset 0 0 60px rgba(72, 149, 239, 0.05);
}

.dark-mode .markdown-content h1::after {
    background: linear-gradient(180deg,
        #4895ef 0%,
        #4cc9f0 40%,
        #7dd3fc 80%,
        #a5f3fc 100%);
    box-shadow:
        0 0 30px rgba(72, 149, 239, 0.7),
        0 0 60px rgba(76, 201, 240, 0.4),
        inset 1px 0 0 rgba(255, 255, 255, 0.3);
}

.dark-mode .markdown-content h1:hover {
    transform: translateY(-5px) scale(1.01);

    /* Enhanced dark glass on hover */
    background: linear-gradient(135deg,
        rgba(30, 41, 59, 0.6) 0%,
        rgba(30, 41, 59, 0.5) 50%,
        rgba(30, 41, 59, 0.4) 100%);

    /* Stronger dark border */
    border: 1px solid rgba(148, 163, 184, 0.4);

    /* Enhanced dark mode glow */
    box-shadow:
        /* Stronger glow */
        0 12px 48px rgba(72, 149, 239, 0.3),
        0 25px 80px rgba(0, 0, 0, 0.8),
        /* Enhanced reflections */
        inset 0 2px 4px rgba(255, 255, 255, 0.15),
        inset 0 -2px 4px rgba(255, 255, 255, 0.08),
        /* Brighter inner glow */
        inset 0 0 80px rgba(72, 149, 239, 0.08);
}

.dark-mode .markdown-content h1:hover::after {
    box-shadow:
        0 0 40px rgba(72, 149, 239, 0.9),
        0 0 80px rgba(76, 201, 240, 0.6),
        0 0 120px rgba(125, 211, 252, 0.4),
        inset 1px 0 0 rgba(255, 255, 255, 0.5);
}

.dark-mode .markdown-content h2,
.dark-mode .markdown-content h3,
.dark-mode .markdown-content h4,
.dark-mode .markdown-content h5 {
    color: #f3f4f6;
}

.dark-mode .markdown-content h6 {
    color: #9ca3af;
}

.dark-mode .markdown-content code {
    background: #1f2937;
    color: #f87171;
    border-color: #374151;
}

.dark-mode .markdown-content pre code {
    background: none;
    border: none;
}

.dark-mode .markdown-content a {
    color: var(--accent);
}

.dark-mode .markdown-content a:hover {
    color: #6bb0ff;
}

.dark-mode .markdown-content strong {
    color: #f3f4f6;
}

.dark-mode .markdown-content em {
    color: #d1d5db;
}

.dark-mode .markdown-content mark {
    background: #854d0e;
    color: #fef08a;
}

.dark-mode .markdown-content kbd {
    background: #1f2937;
    border-color: #4b5563;
    color: #e5e7eb;
}

.dark-mode .markdown-content dt {
    color: #f3f4f6;
}

.dark-mode .markdown-content dd {
    color: #9ca3af;
}

.dark-mode .codehilite {
    background: #1F1F1F !important;
    border: none;
    box-shadow: none;
}

.dark-mode .codehilite .header {
    background: linear-gradient(90deg, #1a1a1a, #0d0d0d);
    border-bottom-color: rgba(255, 255, 255, 0.03);
}

.dark-mode .codehilite .copy-btn {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.08);
    color: #d4d4d4;
}

.dark-mode .codehilite .copy-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.15);
}

.dark-mode .codehilite pre {
    background: #1F1F1F;
    color: #CCCCCC;
}

.dark-mode .codehilite .k,
.dark-mode .codehilite .kc,
.dark-mode .codehilite .kd,
.dark-mode .codehilite .kn,
.dark-mode .codehilite .kp,
.dark-mode .codehilite .kr,
.dark-mode .codehilite .kt {
    color: #569cd6;
}

.dark-mode .codehilite .s,
.dark-mode .codehilite .sb,
.dark-mode .codehilite .sc,
.dark-mode .codehilite .s2,
.dark-mode .codehilite .se,
.dark-mode .codehilite .sh,
.dark-mode .codehilite .sx,
.dark-mode .codehilite .sr,
.dark-mode .codehilite .s1,
.dark-mode .codehilite .ss,
.dark-mode .codehilite .sd {
    color: #ce9178;
}

.dark-mode .codehilite .c,
.dark-mode .codehilite .ch,
.dark-mode .codehilite .cm,
.dark-mode .codehilite .cp,
.dark-mode .codehilite .cpf,
.dark-mode .codehilite .c1,
.dark-mode .codehilite .cs {
    color: #6a9955;
}

.dark-mode .codehilite .m,
.dark-mode .codehilite .mb,
.dark-mode .codehilite .mf,
.dark-mode .codehilite .mh,
.dark-mode .codehilite .mi,
.dark-mode .codehilite .mo {
    color: #b5cea8;
}

.dark-mode .codehilite .nf,
.dark-mode .codehilite .fm,
.dark-mode .codehilite .nb {
    color: #dcdcaa;
}

.dark-mode .codehilite .nc,
.dark-mode .codehilite .nn {
    color: #4ec9b0;
}

.dark-mode .codehilite .n,
.dark-mode .codehilite .nv,
.dark-mode .codehilite .vc,
.dark-mode .codehilite .vg,
.dark-mode .codehilite .vi,
.dark-mode .codehilite .vm {
    color: #9cdcfe;
}

.dark-mode .codehilite .o,
.dark-mode .codehilite .ow {
    color: #d4d4d4;
}

.dark-mode .codehilite .nd {
    color: #dcdcaa;
}

.dark-mode .codehilite .bp {
    color: #569cd6;
}

.dark-mode .codehilite .err {
    color: #f44747;
}

/* HTML/XML Tags - Dark Mode */
.dark-mode .codehilite .nt {
    color: #569cd6;
    font-weight: normal;
}

/* HTML/XML Attributes - Dark Mode */
.dark-mode .codehilite .na {
    color: #9cdcfe;
}

/* Punctuation - Dark Mode */
.dark-mode .codehilite .p {
    color: #808080;
}

/* Entity names (HTML entities like &nbsp;) - Dark Mode */
.dark-mode .codehilite .ni {
    color: #DCDCAA;
}

/* Exceptions - Dark Mode */
.dark-mode .codehilite .ne {
    color: #4EC9B0;
}

/* Labels - Dark Mode */
.dark-mode .codehilite .nl {
    color: #C8C8C8;
}

/* Other constants - Dark Mode */
.dark-mode .codehilite .no {
    color: #4FC1FF;
}

/* Properties - Dark Mode */
.dark-mode .codehilite .py {
    color: #9CDCFE;
}

/* String interpolation - Dark Mode */
.dark-mode .codehilite .si {
    color: #D7BA7D;
}

/* Diff inserted - Dark Mode */
.dark-mode .codehilite .gi {
    color: #b5cea8;
}

/* Diff deleted - Dark Mode */
.dark-mode .codehilite .gd {
    color: #ce9178;
}

/* JavaScript/TypeScript specific tokens - Dark Mode */
.dark-mode .codehilite .nx {
    color: #9CDCFE;
}

/* String affixes (f-strings, r-strings, etc) - Dark Mode */
.dark-mode .codehilite .sa {
    color: #ce9178;
}

/* Whitespace - Dark Mode */
.dark-mode .codehilite .w {
    color: transparent;
}

/* YAML scalars - Dark Mode */
.dark-mode .codehilite .l,
.dark-mode .codehilite .l-Scalar,
.dark-mode .codehilite .l-Scalar-Plain {
    color: #ce9178;
}

/* YAML indicators - Dark Mode */
.dark-mode .codehilite .p-Indicator {
    color: #569cd6;
}

/* Generic heading (markdown) - Dark Mode */
.dark-mode .codehilite .gh {
    color: #569cd6;
    font-weight: bold;
}

/* Generic subheading - Dark Mode */
.dark-mode .codehilite .gu {
    color: #4EC9B0;
    font-weight: bold;
}

.dark-mode .markdown-content blockquote {
    background: linear-gradient(to right, #1e1e1e, #2d2d2d);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.dark-mode .markdown-content table th {
    background: linear-gradient(to right, #3f37c9, #4361ee);
}

.dark-mode .markdown-content table tr:nth-child(even) {
    background-color: #1f2937;
}

.dark-mode .markdown-content table tr:hover {
    background-color: #1e3a8a;
}

.dark-mode .markdown-content .callout {
    background: #1e293b;
}

.dark-mode .markdown-content .callout.warning {
    background: #431407;
}

.dark-mode .markdown-content .callout.danger {
    background: #450a0a;
}

.markdown-content img {
    border-radius: 12px;
    margin: 2em 0;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    max-width: 100%;
}

.markdown-content img:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.lesson-navigation {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 2px solid rgba(67, 97, 238, 0.1);
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.lesson-navigation .btn {
    padding: 14px 28px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(67, 97, 238, 0.15);
}

.lesson-navigation .btn i {
    transition: transform 0.3s ease;
}

.lesson-navigation .btn:hover i {
    transform: scale(1.2);
}

@media (max-width: 768px) {
    .lesson-detail {
        padding: 100px 0 60px;
    }

    .lesson-detail .container {
        padding: 0 15px;
    }

    .lesson-content {
        padding: 40px 20px;
        border-radius: 20px;
        margin: 0;
    }

    .markdown-content {
        font-size: 1rem;
    }

    .markdown-content h1 {
        font-size: 1.8rem;
        padding: 2rem 2rem 2rem 1.6rem;
        margin-bottom: 2.5rem;
        border-radius: 18px;
    }

    .markdown-content h1::after {
        width: 5px;
        border-radius: 18px 0 0 18px;
    }

    .markdown-content h2 {
        font-size: 1.5rem;
    }

    .markdown-content h3 {
        font-size: 1.3rem;
    }

    .markdown-content h4 {
        font-size: 1.15rem;
    }

    .markdown-content h5 {
        font-size: 1.05rem;
    }

    .markdown-content h6 {
        font-size: 0.95rem;
    }

    .codehilite pre {
        font-size: 0.85rem;
        padding: 1em;
    }

    .markdown-content ul,
    .markdown-content ol {
        padding-left: 1.2em;
    }

    .markdown-content ul li,
    .markdown-content ol li {
        padding-left: 1em;
    }

    .lesson-navigation {
        margin-top: 40px;
        padding-top: 30px;
        gap: 10px;
    }

    .lesson-navigation .btn {
        padding: 12px 24px;
        font-size: 0.95rem;
    }
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    border: none;
    background-size: 200% 200%;
    animation: gradientPulse 3s ease infinite;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(67, 97, 238, 0.4);
    animation: gradientPulse 1.5s ease infinite;
}

.btn-outline {
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid rgba(67, 97, 238, 0.3);
    color: var(--primary);
}

.btn-outline:hover {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    border-color: transparent;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(67, 97, 238, 0.4);
}

@keyframes gradientPulse {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@media (max-width: 576px) {
    .lesson-detail {
        padding: 90px 0 50px;
    }

    .lesson-detail .container {
        padding: 0 10px;
    }

    .lesson-content {
        padding: 25px 15px;
        border-radius: 15px;
        margin: 0;
    }

    .lesson-navigation {
        flex-direction: column;
        margin-top: 30px;
        padding-top: 25px;
    }

    .lesson-navigation .btn {
        width: 100%;
        justify-content: center;
        padding: 14px 20px;
        font-size: 0.9rem;
    }

    .markdown-content h1 {
        font-size: 1.5rem;
        padding: 1.8rem 1.5rem 1.8rem 1.4rem;
        margin-bottom: 2rem;
        border-radius: 16px;
    }

    .markdown-content h1::after {
        width: 4px;
        border-radius: 16px 0 0 16px;
    }

    .markdown-content h2 {
        font-size: 1.35rem;
    }

    .markdown-content {
        font-size: 0.95rem;
    }

    .codehilite .copy-btn {
        width: 32px;
        height: 32px;
        font-size: 0.85rem;
    }
}