:root[data-theme="light"] {
    --primary-color: #4a4036;
    --secondary-color: #6b5b4e;
    --accent-color: #c17817;
    --text-color: #2d2420;
    --background-color: #faf6f1;
    --note-bg: #fff8eb;
    --equation-bg: #f5f1eb;
    --border-color: #e6dfd7;
    --card-bg: white;
}

:root[data-theme="dark"] {
    --primary-color: #e1d4c9;
    --secondary-color: #c8b8aa;
    --accent-color: #e1d4c9;
    --text-color: #e1d4c9;
    --background-color: #1a1a1a;
    --note-bg: #2a2a2a;
    --equation-bg: #2a2a2a;
    --border-color: #333333;
    --card-bg: #242424;
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 2rem;
    z-index: 1000;
    background: none;
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
    padding: 0;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.theme-toggle svg {
    width: 24px;
    height: 24px;
    stroke: white;
    stroke-width: 1.5;
    fill: none;
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
    position: absolute;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

[data-theme="dark"] .sun-icon {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="light"] .moon-icon {
    opacity: 0;
    transform: rotate(-90deg);
}

body {
    font-family: 'Lora', Georgia, serif;
    line-height: 1.8;
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
}

h1, h2, h3, .toc {
    font-family: 'Source Sans Pro', sans-serif;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 1rem;
}

header {
    position: relative;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--background-color);
    padding: 3rem 1rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

[data-theme="dark"] header {
    color: var(--text-color);
    background: linear-gradient(135deg, #2a2a2a, #333333);
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
}

header h1 {
    text-align: center;
    margin: 0;
    font-size: 2.75rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.toc {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.toc h2 {
    color: var(--primary-color);
    margin-top: 0;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.75rem;
    font-size: 1.5rem;
}

.toc ul {
    list-style-type: none;
    padding-left: 0;
    margin: 0;
}

.toc ul ul {
    padding-left: 1.5rem;
    margin-top: 0.5rem;
}

.toc li {
    margin: 0.75rem 0;
    font-size: 1rem;
    line-height: 1.4;
}

.toc a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: all 0.3s ease;
    display: block;
    padding: 0.25rem 0;
    border-radius: 4px;
}

.toc a:hover {
    color: var(--accent-color);
    padding-left: 0.5rem;
    background-color: var(--note-bg);
}

.toc a.active {
    color: var(--accent-color);
    font-weight: 600;
    padding-left: 0.5rem;
    background-color: var(--note-bg);
}

article {
    background-color: var(--card-bg);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

h2 {
    color: var(--primary-color);
    font-size: 2.2rem;
    margin-top: 2.5rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

h3 {
    color: var(--secondary-color);
    font-size: 1.7rem;
    margin-top: 2rem;
    margin-bottom: 1.2rem;
    font-weight: 600;
}

p {
    margin-bottom: 1.5rem;
    text-align: justify;
    font-size: 1.1rem;
    line-height: 1.8;
}

.equation {
    background-color: var(--equation-bg);
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1.5rem 0;
    text-align: center;
    font-style: italic;
    font-size: 1.1rem;
}

.note {
    background-color: var(--note-bg);
    padding: 1.5rem;
    border-left: 4px solid var(--accent-color);
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
}

figure {
    margin: 2rem 0;
    text-align: center;
}

figcaption {
    color: var(--secondary-color);
    font-style: italic;
    margin-top: 0.5rem;
}

.fancy-quote {
    background-color: var(--note-bg);
    border-left: 4px solid var(--accent-color);
    margin: 2rem 0;
    padding: 1.5rem 2rem 1.5rem 3.5rem;
    position: relative;
}

.fancy-quote::before {
    content: '“';
    font-family: 'Georgia', serif;
    font-size: 5rem;
    line-height: 1;
    color: var(--accent-color);
    position: absolute;
    left: 1rem;
    top: 1.5rem;
    opacity: 0.2;
}

.fancy-quote p {
    margin-bottom: 0;
    text-align: left;
    font-style: italic;
    color: var(--secondary-color);
}

.fancy-quote .attribution {
    text-align: right;
    margin-top: 1rem;
    font-style: normal;
    font-size: 1rem;
    font-weight: 600;
    font-family: 'Source Sans Pro', sans-serif;
    color: var(--primary-color);
}

pre[class*="language-"] {
    border-radius: 8px;
    margin: 1.5rem 0;
}

.inline-code {
    background-color: var(--equation-bg);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Source Code Pro', Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
}

.code-block {
    background-color: var(--note-bg);
    border-radius: 12px;
    margin: 1.5rem 0;
    position: relative;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    transition: box-shadow 0.3s ease;
    padding: 1.5rem 2rem 0.15rem;
}

.code-block:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

[data-theme="dark"] .code-block {
    background-color: #2d2d2d;
    border: none;
}

.code-block::before {
    content: attr(data-language);
    position: absolute;
    top: 0;
    right: 1rem;
    color: var(--secondary-color);
    font-size: 0.8rem;
    padding: 0.4rem 0.8rem;
    background: var(--background-color);
    border-radius: 0 0 6px 6px;
    border: 1px solid var(--border-color);
    border-top: none;
    font-family: 'Source Sans Pro', sans-serif;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: capitalize;
}

[data-theme="dark"] .code-block::before {
    color: #abb2bf;
    background: rgba(0,0,0,0.3);
    border: none;
}

/* Override Prism styles for light theme */
[data-theme="light"] code[class*="language-"],
[data-theme="light"] pre[class*="language-"] {
    color: var(--text-color);
    background: none;
    text-shadow: none;
    font-family: 'Source Code Pro', Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    font-size: 0.95em;
    text-align: left;
    white-space: pre;
    word-spacing: normal;
    word-break: normal;
    word-wrap: normal;
    line-height: 1.7;
    tab-size: 4;
    hyphens: none;
}

[data-theme="light"] .token.comment,
[data-theme="light"] .token.prolog,
[data-theme="light"] .token.doctype,
[data-theme="light"] .token.cdata {
    color: #93a1a1;
    font-style: italic;
}

[data-theme="light"] .token.punctuation {
    color: #586e75;
}

[data-theme="light"] .token.property,
[data-theme="light"] .token.tag,
[data-theme="light"] .token.boolean,
[data-theme="light"] .token.number,
[data-theme="light"] .token.constant,
[data-theme="light"] .token.symbol,
[data-theme="light"] .token.deleted {
    color: #c17817;
}

[data-theme="light"] .token.selector,
[data-theme="light"] .token.attr-name,
[data-theme="light"] .token.string,
[data-theme="light"] .token.char,
[data-theme="light"] .token.builtin,
[data-theme="light"] .token.inserted {
    color: #618934;
}

[data-theme="light"] .token.operator,
[data-theme="light"] .token.entity,
[data-theme="light"] .token.url,
[data-theme="light"] .language-css .token.string,
[data-theme="light"] .style .token.string {
    color: #4a4036;
    background: none;
}

[data-theme="light"] .token.atrule,
[data-theme="light"] .token.attr-value,
[data-theme="light"] .token.keyword {
    color: #7c4b9c;
    font-weight: 600;
}

[data-theme="light"] .token.function,
[data-theme="light"] .token.class-name {
    color: #2b6cc4;
}

[data-theme="light"] .token.regex,
[data-theme="light"] .token.important,
[data-theme="light"] .token.variable {
    color: #c17817;
}

[data-theme="light"] .token.important,
[data-theme="light"] .token.bold {
    font-weight: 600;
}

[data-theme="light"] .token.italic {
    font-style: italic;
}

.iframe-container {
    position: relative;
    width: 100%;
    height: 400px;
    margin: 2rem 0;
    border-radius: 12px;
    overflow: hidden;
}

.open-new-tab {
    position: absolute;
    top: 8px;
    right: 8px;
    z-index: 10;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: 'Source Sans Pro', sans-serif;
    font-size: 0.85rem;
    color: var(--secondary-color);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.iframe-container:hover .open-new-tab {
    color: var(--primary-color);
}

.open-new-tab:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    background: var(--background-color);
    color: var(--primary-color);
    border-color: var(--border-color);
}

[data-theme="dark"] .open-new-tab:hover {
    background: var(--note-bg);
    border-color: var(--border-color);
}

.open-new-tab svg {
    width: 12px;
    height: 12px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    background: white;
    border-radius: 12px;
}

/* Dynamic sizing iframe containers */
.iframe-container-dynamic-size {
    height: auto !important;
    min-height: 100px; /* Minimum height while loading */
}

.iframe-container-dynamic-size iframe {
    position: static; /* Remove absolute positioning for dynamic sizing */
    display: block;
    width: 100%;
    height: 100%; /* JavaScript will set this dynamically */
    min-height: 100px; /* Minimum height while loading */
}

@media (min-width: 1200px) {
    main.container {
        max-width: 1200px;
        padding: 2rem;
        display: grid;
        grid-template-columns: 250px minmax(0, 1fr);
        gap: 2rem;
        margin: 0 auto;
    }

    header .container {
        max-width: 1200px;
        padding: 0 2rem;
    }

    .toc {
        position: sticky;
        top: 2rem;
        height: fit-content;
        margin: 0;
        grid-column: 1;
        grid-row: 1;
        max-height: calc(100vh - 4rem);
        overflow-y: auto;
        scrollbar-width: thin;
        scrollbar-color: var(--accent-color) var(--background-color);
    }

    .toc::-webkit-scrollbar {
        width: 6px;
    }

    .toc::-webkit-scrollbar-track {
        background: var(--background-color);
        border-radius: 3px;
    }

    .toc::-webkit-scrollbar-thumb {
        background-color: var(--accent-color);
        border-radius: 3px;
    }

    article {
        grid-column: 2;
        margin: 0;
        width: auto;
    }
}

@media (max-width: 1199px) {
    main.container {
        max-width: 900px;
        padding: 1rem;
        display: block;
        margin: 0 auto;
    }

    .toc {
        width: auto;
        margin-bottom: 2rem;
        position: static;
    }

    article {
        width: auto;
        margin: 0 0 2rem 0;
    }
}

.toc-label {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin: 0;
    font-family: 'Source Sans Pro', sans-serif;
    font-weight: 600;
    letter-spacing: 0.02em;
    opacity: 0.9;
}

/* Light mode link colors - only for article content */
[data-theme="light"] article a, header a {
    color: #0066cc;
}
[data-theme="light"] article a:visited {
    color: #551A8B;
}

/* Dark mode link colors - only for article content */
[data-theme="dark"] article a, header a {
    color: #7CB4FF;
}
[data-theme="dark"] article a:visited {
    color: #B8A3FF;  /* More muted purple for better dark mode visibility */
}

/* Hover states for article links */
article a:hover {
    text-decoration: underline;
    opacity: 0.9;
}

/* Mobile optimizations */
@media (max-width: 768px) {
    body {
        margin: 0;
        padding: 0;
    }

    .container {
        padding: 0;
        margin: 0;
        max-width: 100%;
    }

    header {
        padding: 1.5rem 1rem;
        margin-bottom: 0;
        border-radius: 0;
    }

    header .container {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
        padding-top: 1.5rem;
    }

    header h1 {
        font-size: 1.75rem;
    }

    main.container {
        padding: 0;
        margin: 0;
    }

    .toc {
        padding: 1rem;
        margin: 0;
        border-radius: 0;
        border-left: none;
        border-right: none;
        box-shadow: none;
    }

    .toc h2 {
        font-size: 1.3rem;
        padding-bottom: 0.5rem;
    }

    .toc li {
        margin: 0.5rem 0;
    }

    article {
        padding: 1rem;
        margin: 0;
        border-radius: 0;
        border-left: none;
        border-right: none;
        box-shadow: none;
        border-top: 1px solid var(--border-color);
    }

    article:first-of-type {
        border-top: none;
    }

    h2 {
        font-size: 1.6rem;
        margin-top: 1.5rem;
        margin-bottom: 1rem;
    }

    h3 {
        font-size: 1.3rem;
        margin-top: 1.5rem;
        margin-bottom: 1rem;
    }

    p {
        font-size: 1rem;
        margin-bottom: 1rem;
    }

    .equation, .note, .code-block {
        padding: 1rem;
        margin: 1rem 0;
    }

    .fancy-quote {
        padding: 1rem 1.5rem 1rem 2.5rem;
    }

    .fancy-quote::before {
        font-size: 3.5rem;
        left: 0.5rem;
        top: 1rem;
    }

    .iframe-container {
        margin: 1rem 0;
        height: 300px;
        border-radius: 0;
    }

    iframe {
        border-radius: 0;
    }
}