/* ------------------------------------------------------------------
   1. CSS VARIABLES (Theme Configuration)
   ------------------------------------------------------------------ */

:root {
    /* Font Stacks */
    --font-serif: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "HG Mincho E", "MS PMincho", "MS Mincho", Georgia, "Times New Roman", Times, serif;
    --font-sans-serif: "Hiragino Sans", "Yu Gothic", "YuGothic", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-monospace: Consolas, Monaco, "Courier New", monospace;
    --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Dynamic Settings (Controlled by JS) */
    --current-font-family: var(--font-serif);
    --font-base-size: 16px;

    /* Base Colors */
    --text-color: #212529;
    --background-color: #FFFFFF;
    --accent-color: #4a6a70;

    /* Interface Colors (Default Light Mode) */
    --border-color: #e9ecef;
    --modal-header-bg: #f8f9fa;
    --light-gray-color: #f8f9fa;
    --code-background: #f8f9fa;

    /* Derived Colors (Automatic Calculations) */
    --accent-hover-color: color-mix(in srgb, var(--accent-color), white 20%);
    --accent-visited-color: color-mix(in srgb, var(--accent-color), black 20%);
    --blockquote-border: var(--accent-color);
    --secondary-text-color: color-mix(in srgb, var(--text-color), transparent 40%);
    --muted-text-color: color-mix(in srgb, var(--text-color), transparent 60%);
    --button-text-color: #495057;

    /* Visual Effects */
    --shadow-light: rgba(0, 0, 0, 0.07);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --overlay-dark: rgba(0, 0, 0, 0.5);
    --strikethrough-color: rgba(108, 117, 125, 0.6);
    --figcaption-color: rgba(108, 117, 125, 0.8);
    --highlight-background: rgba(255, 235, 59, 0.3);

    /* Menu Configuration */
    --menu-background: var(--background-color);
    --menu-border: var(--border-color);
    --menu-line-color: var(--text-color);
    --menu-border-hover: var(--text-color);
    --menu-background-active: var(--background-color);

    /* Alert Colors (GitHub Style) */
    --alert-note-border: #5889b7;
    --alert-note-bg: #eef5fc;
    --alert-warning-border: #b78d48;
    --alert-warning-bg: #fcf8e3;
    --alert-important-border: #8a6d3b;
    --alert-important-bg: #fdf7f7;
    --alert-tip-border: #5f9a6f;
    --alert-tip-bg: #eefaf0;
    --alert-caution-border: #b85c5c;
    --alert-caution-bg: #fceeee;

    /* Syntax Highlighting */
    --code-text-color: var(--text-color);
    --code-border-color: var(--border-color);

    /* UI Controls */
    --copy-btn-bg: var(--background-color);
    --copy-btn-border: var(--border-color);
    --copy-btn-hover-bg: var(--border-color);
    --copy-btn-success-bg: #5f9a6f;
    --copy-btn-success-color: white;

    /* Layout Units */
    --baseline-unit: 1.75rem;
}

/* ------------------------------------------------------------------
   2. BASE & RESET
   ------------------------------------------------------------------ */

html {
    font-size: var(--font-base-size);
    font-family: var(--current-font-family);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    hanging-punctuation: first allow-end last;
    scroll-behavior: smooth;
}

body {
    font-size: clamp(1rem, 2.5vw, 1rem);
    line-height: 1.75;
    max-width: 40em;
    margin: auto;
    color: var(--text-color);
    background-color: var(--background-color);
    padding: 0;
    font-family: var(--current-font-family);
    font-feature-settings: "palt" 1, "pkna" 1;
    font-variant-numeric: proportional-nums;
    font-kerning: auto;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ------------------------------------------------------------------
   3. TYPOGRAPHY
   ------------------------------------------------------------------ */

h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-family: var(--current-font-family);
    font-weight: 700;
    margin-top: calc(var(--baseline-unit) * 1.5);
    margin-bottom: var(--baseline-unit);
    overflow-wrap: break-word;
    word-wrap: break-word;
    font-feature-settings: "palt" 1, "pkna" 1;
    letter-spacing: 0.02em;
    position: relative;
    color: var(--text-color);
}

h1 {
    font-size: clamp(2rem, 6vw, 2.5rem);
    text-align: center;
    margin: calc(var(--baseline-unit) * 4) 0 calc(var(--baseline-unit) * 2) 0;
    padding: clamp(0.5rem, 3vw, 2rem) 0;
    box-sizing: border-box;
    letter-spacing: 0.05em;
    font-weight: 600;
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    page-break-before: always;
    margin-top: calc(var(--baseline-unit) * 2);
    margin-bottom: var(--baseline-unit);
    letter-spacing: 0.03em;
    font-weight: 600;
}

h3 {
    font-size: clamp(1.25rem, 3.5vw, 1.75rem);
    letter-spacing: 0.025em;
    font-weight: 500;
}

h4 {
    font-size: clamp(1.125rem, 3vw, 1.5rem);
    letter-spacing: 0.02em;
    font-weight: 500;
}

h5 {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    letter-spacing: 0.015em;
    font-weight: 400;
}

h6 {
    font-size: clamp(0.875rem, 2vw, 1rem);
    letter-spacing: 0.01em;
    font-weight: 400;
}

p {
    margin-top: 0;
    margin-bottom: var(--baseline-unit);
    margin-right: clamp(0.5rem, 2vw, 1rem);
    margin-left: clamp(0.5rem, 2vw, 1rem);
    padding: 0;
    text-align: justify;
    text-justify: inter-ideograph;
    line-height: 1.75;
    font-size: clamp(1rem, 2.5vw, 1rem);
    font-family: var(--current-font-family);
    letter-spacing: 0.025em;
    word-spacing: 0.1em;
    hyphens: auto;
    text-indent: 0;
}

p:first-of-type:first-letter {
    font-size: 1.2em;
    font-weight: 600;
    line-height: 1;
}

/* Inline Elements */
strong,
b {
    font-weight: 600;
    letter-spacing: 0.01em;
}

em,
i {
    font-style: italic;
    letter-spacing: 0.02em;
}

small,
sub,
sup {
    font-size: 75%;
}

u {
    text-decoration: underline;
    text-decoration-color: var(--accent-color);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
}

s,
del {
    text-decoration: line-through;
    text-decoration-color: var(--strikethrough-color);
    text-decoration-thickness: 1px;
}

mark {
    background-color: var(--highlight-background);
    color: var(--text-color);
    padding: 0.1em 0.2em;
    border-radius: 2px;
}

.numbers,
time,
data {
    font-variant-numeric: proportional-nums;
    font-feature-settings: "tnum" 0, "pnum" 1;
}

a {
    text-decoration: none;
    color: var(--accent-color);
    word-break: break-all;
    overflow-wrap: break-word;
}

a:visited {
    color: var(--accent-visited-color);
}

a:hover {
    color: var(--accent-hover-color);
    border-bottom: 2px solid var(--text-color);
}

/* ------------------------------------------------------------------
   4. LAYOUT COMPONENTS
   ------------------------------------------------------------------ */

/* Document Metadata Header */
.document-header {
    text-align: center;
    margin-bottom: calc(var(--baseline-unit) * 2);
    padding-bottom: calc(var(--baseline-unit) * 1);
    border-bottom: 2px solid var(--border-color);
}

.document-header h1 {
    margin-bottom: calc(var(--baseline-unit) * 0.5);
    border-bottom: none;
}

.document-header .author {
    font-size: 1.1em;
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: calc(var(--baseline-unit) * 0.25);
    font-family: var(--font-sans-serif);
}

.document-header .date,
.document-header .institution {
    font-size: 0.9em;
    color: var(--secondary-text-color);
    margin-bottom: calc(var(--baseline-unit) * 0.125);
}

.document-header .institution {
    font-style: italic;
}

.document-header .editor {
    font-size: 0.85em;
    color: var(--muted-text-color);
    font-style: italic;
}

/* Lists */
ul,
ol {
    margin-left: clamp(0.5rem, 2vw, 1rem);
    padding-left: clamp(1.5rem, 3vw, 2em);
    padding-right: 0;
    margin-top: 0;
    margin-bottom: var(--baseline-unit);
    font-size: clamp(1rem, 2.5vw, 1rem);
    line-height: 1.75;
    font-family: var(--current-font-family);
    letter-spacing: 0.025em;
}

ul {
    list-style-type: disc;
    list-style-position: outside;
}

li {
    margin-bottom: calc(var(--baseline-unit) * 0.5);
    overflow-wrap: break-word;
    word-wrap: break-word;
}

li ul,
li ol {
    margin-top: calc(var(--baseline-unit) * 0.25);
    margin-bottom: calc(var(--baseline-unit) * 0.25);
    padding-left: clamp(1.5rem, 3vw, 2em);
}

li li {
    margin-bottom: calc(var(--baseline-unit) * 0.25);
}

/* Ordered List Counters */
ol {
    list-style: none;
    counter-reset: level1;
}

ol li {
    counter-increment: level1;
    position: relative;
}

ol li::before {
    content: counter(level1) "";
    font-weight: 600;
    color: var(--text-color);
    position: absolute;
    left: -2.5em;
    min-width: 2em;
    text-align: right;
}

ol ol {
    counter-reset: level2;
}

ol ol li {
    counter-increment: level2;
}

ol ol li::before {
    content: counter(level1) "." counter(level2) " ";
    left: -3.5em;
    min-width: 3em;
}

ol ol ol {
    counter-reset: level3;
}

ol ol ol li {
    counter-increment: level3;
}

ol ol ol li::before {
    content: counter(level1) "." counter(level2) "." counter(level3) " ";
    left: -4.5em;
    min-width: 4em;
}

/* Blockquotes */
blockquote {
    margin: var(--baseline-unit) 0;
    padding: calc(var(--baseline-unit) * 0.75) 1.5em;
    border-left: 4px solid var(--blockquote-border);
    background-color: var(--light-gray-color);
    font-family: var(--current-font-family);
    font-style: italic;
    line-height: 1.6;
    font-size: 0.95em;
    letter-spacing: 0.02em;
    text-align: left;
    overflow-wrap: break-word;
    color: var(--text-color);
}

blockquote p {
    margin-bottom: calc(var(--baseline-unit) * 0.5);
}

blockquote p:last-child {
    margin-bottom: 0;
}

/* Images & Media */
img,
video {
    height: auto;
    max-width: 100%;
    margin-top: 0;
    margin-bottom: var(--baseline-unit);
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

figure {
    margin: calc(var(--baseline-unit) * 1.5) 0;
    text-align: center;
    display: block;
    clear: both;
}

figure img {
    margin-bottom: calc(var(--baseline-unit) * 0.125);
    box-shadow: 0 2px 8px var(--shadow-light);
    border-radius: 4px;
}

figcaption {
    font-size: 0.875em;
    line-height: 1.4;
    color: var(--figcaption-color);
    font-style: italic;
    font-family: var(--current-font-family);
    letter-spacing: 0.02em;
    text-align: center;
    margin-top: calc(var(--baseline-unit) * 0.25);
    padding: 0 1rem;
}

hr {
    border: none;
    border-top: 1px solid var(--accent-color);
    margin: calc(var(--baseline-unit) * 1.5) auto;
    width: 50%;
}

/* Code Blocks */
code,
kbd,
samp {
    font-family: var(--font-monospace);
    font-size: 0.875em;
    padding: 0.2em 0.4em;
    background-color: var(--code-background);
    border-radius: 3px;
    color: var(--code-text-color);
    white-space: pre-wrap;
    overflow-wrap: break-word;
    font-feature-settings: "liga" 0;
    letter-spacing: 0;
}

pre {
    background-color: var(--code-background);
    display: block;
    padding: 1rem;
    overflow-x: auto;
    margin: 1.5rem 0;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-family: var(--font-monospace);
    font-size: 0.875em;
    line-height: 1.5;
    font-feature-settings: "liga" 0;
    font-variant-ligatures: none;
    letter-spacing: 0;
}

pre code {
    padding: 0;
    background-color: transparent;
    white-space: pre;
    font-size: 1em;
    border-radius: 0;
    color: var(--code-text-color);
    line-height: 1.45;
}

pre[class*="language-"],
code[class*="language-"] {
    background: var(--code-background) !important;
    text-shadow: none !important;
}

.code-block-container {
    position: relative;
    margin: 1.5rem 0;
}

.code-block-container pre {
    margin: 0;
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 10;
    background-color: var(--copy-btn-bg);
    border: 1px solid var(--copy-btn-border);
    border-radius: 4px;
    padding: 5px 10px;
    font-size: 0.8rem;
    font-family: var(--font-sans-serif);
    color: var(--text-color);
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

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

.copy-btn:hover {
    background-color: var(--copy-btn-hover-bg);
}

.copy-btn.copied {
    background-color: var(--copy-btn-success-bg);
    color: var(--copy-btn-success-color);
    border-color: var(--copy-btn-success-bg);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--baseline-unit) 0;
    font-size: 0.9rem;
    line-height: 1.5;
    font-family: var(--current-font-family);
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
}

table thead {
    background-color: var(--modal-header-bg);
}

th,
td {
    padding: 0.75rem;
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    overflow-wrap: break-word;
    word-wrap: break-word;
    color: var(--text-color);
}

th {
    font-weight: 600;
    border-bottom: 2px solid var(--accent-color);
    background-color: var(--modal-header-bg);
    font-family: var(--font-sans-serif);
}

th:last-child,
td:last-child {
    border-right: none;
}

table tbody tr:last-child td {
    border-bottom: none;
}

table tbody tr:hover {
    background-color: var(--light-gray-color);
}

td.number,
th.number {
    text-align: right;
}

table code {
    font-size: 0.8em;
    background-color: var(--code-background);
    padding: 0.1em 0.3em;
    border-radius: 3px;
}

/* ------------------------------------------------------------------
   5. EXTENDED COMPONENTS (Alerts, Footnotes, Footer)
   ------------------------------------------------------------------ */

/* GitHub Alerts */
.alert {
    margin: var(--baseline-unit) 0;
    padding: var(--baseline-unit);
    border-radius: 6px;
    border-left: 4px solid;
    background-color: var(--light-gray-color);
    box-shadow: 0 2px 8px var(--shadow-medium);
    font-family: var(--current-font-family);
    line-height: 1.6;
    font-feature-settings: "palt" 1, "pkna" 1;
    color: #212529;
}

.alert-header {
    margin-bottom: calc(var(--baseline-unit) * 0.5);
    font-weight: 600;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
}

.alert-title {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.875rem;
    font-weight: 700;
}

.alert-content {
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.65;
}

.alert-content p {
    margin: calc(var(--baseline-unit) * 0.3) 0;
    font-family: inherit;
    text-align: left;
    letter-spacing: 0.02em;
}

.alert-content p:first-child {
    margin-top: 0;
}

.alert-content p:last-child {
    margin-bottom: 0;
}

.alert-content strong,
.alert-content b {
    font-weight: 600;
    letter-spacing: 0.01em;
}

.alert-content code {
    font-size: 0.875em;
    padding: 0.15em 0.3em;
}

/* Alert Variations */
.alert-note {
    border-left-color: var(--alert-note-border);
    background-color: var(--alert-note-bg);
}

.alert-note .alert-title {
    color: var(--alert-note-border);
}

.alert-warning {
    border-left-color: var(--alert-warning-border);
    background-color: var(--alert-warning-bg);
}

.alert-warning .alert-title {
    color: var(--alert-warning-border);
}

.alert-important {
    border-left-color: var(--alert-important-border);
    background-color: var(--alert-important-bg);
}

.alert-important .alert-title {
    color: var(--alert-important-border);
}

.alert-tip {
    border-left-color: var(--alert-tip-border);
    background-color: var(--alert-tip-bg);
}

.alert-tip .alert-title {
    color: var(--alert-tip-border);
}

.alert-caution {
    border-left-color: var(--alert-caution-border);
    background-color: var(--alert-caution-bg);
}

.alert-caution .alert-title {
    color: var(--alert-caution-border);
}

/* Footnotes */
.footnotes {
    margin-top: 2rem;
    margin-left: clamp(0.5rem, 2vw, 1rem);
    margin-right: clamp(0.5rem, 2vw, 1rem);
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.footnote {
    margin-bottom: 0.8rem;
    font-size: 0.85rem;
    line-height: 1.4;
    color: var(--text-color);
}

.footnote sup {
    font-weight: bold;
    margin-right: 0.5rem;
}

.footnote-ref {
    text-decoration: none;
    color: var(--accent-color);
    font-weight: normal;
}

.footnote-ref:hover {
    color: var(--accent-hover-color);
    border-bottom: none;
}

/* Footer */
.markpaper-footer {
    margin-top: calc(var(--baseline-unit) * 3);
    padding: calc(var(--baseline-unit) * 1) 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    background-color: var(--background-color);
}

.markpaper-footer p {
    font-size: 0.8rem;
    color: var(--muted-text-color);
    margin: 0;
    font-style: italic;
    font-family: var(--font-sans-serif);
    text-align: center;
}

.markpaper-footer a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.markpaper-footer a:visited {
    color: var(--accent-visited-color);
}

#generated-by {
    font-size: 1.1em;
}

/* ------------------------------------------------------------------
   6. UI CONTROLS & OVERLAY (Menu, Settings, TOC)
   ------------------------------------------------------------------ */

.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: var(--accent-color);
    z-index: 9999;
    transition: width 0.1s;
    box-shadow: 0 1px 2px var(--shadow-light);
}

.heading-anchor {
    position: absolute;
    left: -1.2em;
    opacity: 0;
    text-decoration: none;
    color: var(--accent-color);
    font-weight: normal;
    transition: opacity 0.2s;
    font-size: 0.7em;
    padding: 0.2em 0.5em;
    cursor: pointer;
    border-bottom: none !important;
}

h1:hover .heading-anchor,
h2:hover .heading-anchor,
h3:hover .heading-anchor,
h4:hover .heading-anchor,
h5:hover .heading-anchor,
h6:hover .heading-anchor {
    opacity: 1;
}

.hamburger-btn,
.settings-btn {
    position: fixed;
    top: 20px;
    z-index: 100;
    background: var(--menu-background);
    border: 1px solid var(--menu-border);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px var(--shadow-light);
    color: var(--menu-line-color);
}

.hamburger-btn {
    right: 20px;
}

.settings-btn {
    right: 80px;
}

.hamburger-btn:hover,
.settings-btn:hover {
    background: var(--border-color);
    border-color: var(--menu-border-hover);
}

.hamburger-btn.active {
    z-index: 250;
    background: var(--menu-background-active);
}

.hamburger-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--menu-line-color);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.hamburger-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5.5px, 5.5px);
}

.hamburger-btn.active span:nth-child(2) {
    opacity: 0;
    transform: scale(0);
}

.hamburger-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5.5px, -5.5px);
}

.side-menu {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100vh;
    background: var(--background-color);
    border-left: 1px solid var(--border-color);
    box-shadow: -2px 0 10px var(--shadow-light);
    z-index: 200;
    transition: right 0.3s ease;
    overflow-y: auto;
    padding: 0;
}

.side-menu.open {
    right: 0;
}

.side-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--background-color);
    color: var(--text-color);
}

.side-menu-header h3 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--text-color);
}

.table-of-contents {
    list-style: none;
    padding: 0;
    margin: 0;
}

.table-of-contents li {
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0px !important;
}

.table-of-contents a {
    display: block;
    padding: 20px 20px;
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    line-height: 1.4;
}

.table-of-contents a:hover {
    background: var(--border-color);
    color: var(--text-color);
    padding-left: 25px;
}

.table-of-contents a.active {
    background: var(--border-color);
    color: var(--text-color);
    font-weight: bold;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--overlay-dark);
    z-index: 150;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.overlay.show {
    opacity: 1;
    visibility: visible;
}

/* Settings Modal */
.settings-modal {
    position: fixed;
    top: 80px;
    right: 80px;
    width: 300px;
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-medium);
    z-index: 250;
    padding: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    color: var(--text-color);
}

.settings-modal.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    background: var(--modal-header-bg);
    border-radius: 8px 8px 0 0;
}

.settings-header h3 {
    margin: 0;
    font-size: 1rem;
    color: var(--text-color);
}

.close-settings {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
}

.settings-body {
    padding: 15px;
}

.setting-group {
    margin-bottom: 15px;
}

.setting-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-color);
}

.setting-group input[type="range"] {
    width: 100%;
}

.setting-group select {
    width: 100%;
    padding: 5px;
    background: var(--background-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.setting-group input[type="color"] {
    width: 100%;
    height: 35px;
    border: none;
    padding: 0;
    cursor: pointer;
    background: none;
}

.theme-buttons {
    display: flex;
    gap: 10px;
}

.theme-buttons button {
    flex: 1;
    padding: 8px;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: var(--code-background);
    color: var(--text-color);
    border-radius: 4px;
    font-weight: 500;
}

.theme-buttons button:hover {
    background: var(--border-color);
}

.setting-actions {
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
    text-align: right;
}

.btn-reset {
    font-size: 0.85rem;
    padding: 5px 10px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--secondary-text-color);
    cursor: pointer;
    border-radius: 4px;
}

.btn-reset:hover {
    background: #fdf2f2;
    color: #dc3545;
    border-color: #f5c6cb;
}

/* Custom scrollbars */
/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--accent-color) transparent;
}

/* Chrome, Edge, Safari */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: var(--accent-color);
    border-radius: 10px;
    border: 1px solid transparent;
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--accent-hover-color);
}

::-webkit-scrollbar-corner {
    background: transparent;
}

/* ------------------------------------------------------------------
   7. MEDIA QUERIES
   ------------------------------------------------------------------ */

@media (max-width: 575.98px) {
    body {
        max-width: 100%;
        padding: 0 0.75rem;
    }

    h1 {
        line-height: 1.2;
    }

    p {
        margin-left: 0.5rem;
        margin-right: 0.5rem;
    }

    .document-header {
        margin-bottom: calc(var(--baseline-unit) * 1.5);
        padding-bottom: calc(var(--baseline-unit) * 0.75);
    }

    .document-header .author {
        font-size: 1em;
    }

    .document-header .date,
    .document-header .institution {
        font-size: 0.85em;
    }

    .document-header .editor {
        font-size: 0.8em;
    }

    .side-menu {
        width: 280px;
        right: -280px;
    }

    .hamburger-btn {
        top: 15px;
        right: 15px;
        width: 45px;
        height: 45px;
    }

    .settings-btn {
        top: 15px;
        right: 70px;
        width: 45px;
        height: 45px;
    }

    .settings-modal {
        right: 50%;
        transform: translateX(50%) translateY(10px);
        width: 90%;
    }

    .settings-modal.open {
        transform: translateX(50%) translateY(0);
    }

    .alert {
        margin: 1rem 0;
        padding: 0.75rem;
        border-radius: 6px;
    }

    .alert-header {
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }

    pre {
        margin: 1rem 0;
        padding: 0.75rem;
        border-radius: 4px;
    }

    pre code {
        font-size: 0.8rem;
    }

    code {
        font-size: 0.85em;
        padding: 0.15em 0.3em;
    }

    table {
        font-size: 0.8rem;
        margin: 1rem 0;
    }

    table th,
    table td {
        padding: 0.5rem;
    }

    .markpaper-footer {
        margin-top: calc(var(--baseline-unit) * 2);
        padding: calc(var(--baseline-unit) * 0.75) 0;
    }

    .markpaper-footer p {
        font-size: 0.75rem;
        padding: 0 1rem;
    }
}

@media (min-width: 576px) and (max-width: 767.98px) {
    body {
        max-width: 540px;
    }
}

@media (min-width: 768px) and (max-width: 991.98px) {
    body {
        max-width: 720px;
    }
}

@media (min-width: 992px) and (max-width: 1199.98px) {
    body {
        max-width: 960px;
    }
}

@media (min-width: 1200px) {
    body {
        max-width: 1100px;
    }
}