:root {
    
    --bg-primary: #0F172A;
    
    --bg-secondary: #1E293B;
    
    --bg-tertiary: #334155;
    

    --text-primary: #F8FAFC;
    
    --text-secondary: #CBD5E1;
    
    --text-muted: #94A3B8;
    

    --accent-primary: #38BDF8;
    
    --accent-secondary: #818CF8;
    
    --border-color: #334155;

    
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-serif: 'Merriweather', 'Georgia', serif;

    
    --max-width: 65ch;
    
    --header-height: 70px;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    line-height: 1.7;
    font-size: 1.05rem;
    -webkit-font-smoothing: antialiased;
    overflow-wrap: break-word;
}


mjx-container,
.MathJax {
    overflow-x: auto !important;
    overflow-y: hidden;
    max-width: 100%;
    margin-bottom: 1em !important;
}


.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.prose {
    max-width: var(--max-width);
    margin: 0 auto;
}


h1,
h2,
h3,
h4 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    text-wrap: balance;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    background: linear-gradient(to right, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
}

h2 {
    font-size: 1.75rem;
    margin-top: 3rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.4rem;
    margin-top: 2rem;
    color: var(--accent-primary);
}

p {
    margin-bottom: 1.5rem;
}

strong {
    color: var(--text-primary);
    font-weight: 600;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s;
    border-bottom: 1px solid transparent;
}

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


.site-header {
    background-color: rgba(15, 23, 42, 0.95);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    display: flex;
    align-items: center;
    backdrop-filter: blur(8px);
}

.nav-container {
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
    text-decoration: none;
    border: none;
}

.logo:hover {
    border: none;
    opacity: 0.9;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    border: none;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-primary);
}


.hero {
    text-align: left;
    padding: 0.5rem 0 0.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 4rem;
}

.hero h1 {
    font-size: 3.5rem;
    max-width: none;
    margin-bottom: 0.5rem;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 50ch;
}


.track-section {
    margin-bottom: 2rem;
    padding-left: 1.5rem;
    border-left: 2px solid var(--border-color);
    position: relative;
}

main {
    padding-bottom: 0.2rem;
}

ol {
    list-style-type: none;
}

ul {
    list-style-type: none;
}

.track-section::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 0;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--text-muted);
    transition: background-color 0.3s;
}

.track-section:hover::before {
    background-color: var(--accent-primary);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.section-icon {
    color: var(--accent-primary);
    opacity: 0.8;
}

.track-section h2 {
    border: none;
    margin: 0;
    padding: 0;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.module-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.module-link {
    display: block;
    padding: 1.25rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.2s ease;
    border-bottom: none;
}

.module-link:hover {
    transform: translateY(-2px);
    border-color: var(--accent-primary);
    background-color: #233044;
}

.module-link h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.module-link p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-muted);
}


table {
    width: 100%;
    margin: 2rem 0;
    border-collapse: collapse;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    overflow: hidden;
    font-size: 0.95rem;
}

th,
td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
}

code {
    font-family: 'Fira Code', 'Consolas', monospace;
    background-color: var(--bg-tertiary);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent-primary);
}

pre {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
}

pre code {
    background: none;
    padding: 0;
    color: var(--text-secondary);
}


.site-footer {
    border-top: 1px solid var(--border-color);
    margin-top: 0.2rem;
    padding: 2rem 0;
    text-align: center;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border: none;
}

.social-link:hover {
    color: var(--text-primary);
}


@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
        word-break: break-word;
        
    }

    .track-section {
        padding-left: 1rem;
        border-left-width: 1px;
    }

    .module-list {
        grid-template-columns: 1fr;
    }

    
    .site-header {
        height: auto;
        padding: 0.5rem 0;
    }

    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1.5rem;
        font-size: 0.9rem;
    }

    .content-wrapper {
        padding: 1.5rem 1rem;
    }
}