/* ============================================
   Notion-inspired design system
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
    --font-mono: "SFMono-Regular", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    --font-serif: "Lyon-Text", Georgia, "Times New Roman", serif;

    --content-width: 800px;
    --page-padding: 2rem;

    --bg: #ffffff;
    --bg-secondary: #f7f7f5;
    --bg-tertiary: #f1f1ef;
    --bg-hover: rgba(55, 53, 47, 0.04);
    --bg-active: rgba(55, 53, 47, 0.08);

    --text-primary: #37352f;
    --text-secondary: #787774;
    --text-tertiary: #b4b4b0;
    --text-link: #37352f;

    --border: rgba(55, 53, 47, 0.09);
    --border-strong: rgba(55, 53, 47, 0.16);

    --code-bg: rgba(135, 131, 120, 0.15);
    --code-block-bg: #f7f6f3;
    --code-text: #eb5757;

    --accent: #2eaadc;
    --accent-light: rgba(46, 170, 220, 0.1);

    --tag-bg: rgba(206, 205, 202, 0.5);
    --tag-text: #37352f;

    --quote-border: #37352f;
    --quote-bg: transparent;

    --callout-bg: rgba(241, 241, 239, 1);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);

    --standout-border: #2eaadc;

    --radius-sm: 3px;
    --radius-md: 6px;
    --radius-lg: 12px;

    --transition: 0.2s ease;
}

[data-theme="dark"] {
    --bg: #191919;
    --bg-secondary: #202020;
    --bg-tertiary: #2f2f2f;
    --bg-hover: rgba(255, 255, 255, 0.04);
    --bg-active: rgba(255, 255, 255, 0.08);

    --text-primary: rgba(255, 255, 255, 0.9);
    --text-secondary: rgba(255, 255, 255, 0.5);
    --text-tertiary: rgba(255, 255, 255, 0.3);
    --text-link: rgba(255, 255, 255, 0.9);

    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);

    --code-bg: rgba(135, 131, 120, 0.15);
    --code-block-bg: #2f2f2f;
    --code-text: #ff7b72;

    --accent: #529cca;
    --accent-light: rgba(82, 156, 202, 0.15);

    --tag-bg: rgba(255, 255, 255, 0.08);
    --tag-text: rgba(255, 255, 255, 0.7);

    --quote-border: rgba(255, 255, 255, 0.4);

    --callout-bg: rgba(47, 47, 47, 1);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);

    --standout-border: #529cca;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg);
    line-height: 1.6;
    transition: background-color var(--transition), color var(--transition);
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* --- Layout --- */
.page-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-content {
    flex: 1;
    width: 100%;
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 var(--page-padding);
}

/* --- Navigation --- */
.nav {
    width: 100%;
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 1.5rem var(--page-padding) 0;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 1.5rem;
}

.nav-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
    line-height: 20px;
}

.nav-title:hover {
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    line-height: 20px;
}

.nav-link {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}

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

.nav-link.active {
    color: var(--text-primary);
    font-weight: 500;
}

/* --- Dark Mode Toggle --- */
.dark-mode-toggle {
    position: relative;
    width: 36px;
    height: 20px;
    border-radius: 10px;
    border: 1.5px solid var(--border-strong);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all var(--transition);
    appearance: none;
    outline: none;
    flex-shrink: 0;
}

.dark-mode-toggle::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-secondary);
    transition: all var(--transition);
}

.dark-mode-toggle.dark::after {
    transform: translateX(16px);
    background: var(--text-primary);
}

.dark-mode-toggle:hover {
    border-color: var(--text-secondary);
}

/* --- Home Page --- */
.home-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--page-padding);
    text-align: center;
}

.home-header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.home-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    font-weight: 400;
}

.home-nav {
    display: flex;
    gap: 1rem;
}

.home-nav-link {
    display: inline-flex;
    align-items: center;
    padding: 0.625rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition);
}

.home-nav-link:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-sm);
}

/* --- Social Links --- */
.social-links {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    padding: 2rem 0;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--text-tertiary);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.social-link:hover {
    color: var(--text-secondary);
    background: var(--bg-hover);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

/* --- Page Header --- */
.page-header {
    padding: 3rem 0 2rem;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 0.375rem;
}

.page-header .subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* --- Post List --- */
.post-list {
    list-style: none;
    padding: 0;
}

.post-list-item {
    border-bottom: 1px solid var(--border);
}

.post-list-item:last-child {
    border-bottom: none;
}

.post-list-link {
    display: block;
    padding: 1rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition);
    cursor: pointer;
}

.post-list-link:hover {
    background: var(--bg-hover);
}

.post-list-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.post-list-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0.375rem;
}

.post-list-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.post-list-date {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.post-list-tags {
    display: flex;
    gap: 0.375rem;
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    color: var(--tag-text);
    background: var(--tag-bg);
}

.tag[data-color="blue"]   { background: rgba(46,170,220,0.12);  color: #2383b5; }
.tag[data-color="green"]  { background: rgba(77,171,104,0.12);  color: #2e8049; }
.tag[data-color="red"]    { background: rgba(235,87,87,0.12);   color: #c04040; }
.tag[data-color="yellow"] { background: rgba(203,145,47,0.14);  color: #9b6a1f; }
.tag[data-color="purple"] { background: rgba(144,101,176,0.12); color: #7b4fb0; }
.tag[data-color="pink"]   { background: rgba(193,76,138,0.12);  color: #b24080; }
.tag[data-color="orange"] { background: rgba(215,134,47,0.14);  color: #b06020; }
.tag[data-color="gray"]   { background: var(--tag-bg);          color: var(--tag-text); }

[data-theme="dark"] .tag[data-color="blue"]   { background: rgba(46,170,220,0.18);  color: #68b8e0; }
[data-theme="dark"] .tag[data-color="green"]  { background: rgba(77,171,104,0.18);  color: #6bc48a; }
[data-theme="dark"] .tag[data-color="red"]    { background: rgba(235,87,87,0.18);   color: #e87070; }
[data-theme="dark"] .tag[data-color="yellow"] { background: rgba(203,145,47,0.20);  color: #d4a94e; }
[data-theme="dark"] .tag[data-color="purple"] { background: rgba(144,101,176,0.18); color: #b893d6; }
[data-theme="dark"] .tag[data-color="pink"]   { background: rgba(193,76,138,0.18);  color: #d070a8; }
[data-theme="dark"] .tag[data-color="orange"] { background: rgba(215,134,47,0.20);  color: #e0a050; }
[data-theme="dark"] .tag[data-color="gray"]   { background: var(--tag-bg);          color: var(--tag-text); }

/* --- Blog Post --- */
.post-wrapper {
    padding-bottom: 4rem;
}

.post-back {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 1.25rem 0;
    transition: color var(--transition);
    cursor: pointer;
    background: none;
    border: none;
    font-family: inherit;
}

.post-back:hover {
    color: var(--text-primary);
}

.post-header {
    padding-bottom: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.post-title {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 0.75rem;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}

.post-date {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.post-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 0.75rem;
    line-height: 1.6;
}

.post-tags {
    display: flex;
    gap: 0.375rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
}

/* --- Post Content (Notion-like prose) --- */
.post-content {
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.75;
    color: var(--text-primary);
}

.post-content > *:first-child {
    margin-top: 0;
}

.post-content h1 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-top: 2.5rem;
    margin-bottom: 0.25rem;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.post-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.25rem;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.post-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 1.75rem;
    margin-bottom: 0.25rem;
    line-height: 1.4;
}

.post-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.25rem;
}

.post-content p {
    margin: 0.5rem 0;
}

.post-content ul,
.post-content ol {
    margin: 0.25rem 0;
    padding-left: 1.625rem;
}

.post-content li {
    margin-bottom: 0.25rem;
    padding-left: 0.25rem;
}

.post-content li > ul,
.post-content li > ol {
    margin-top: 0.125rem;
    margin-bottom: 0.125rem;
}

/* Links */
.post-content a {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: var(--text-tertiary);
    text-underline-offset: 2px;
    transition: text-decoration-color var(--transition);
}

.post-content a:hover {
    text-decoration-color: var(--text-primary);
}

/* Inline code */
.post-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    padding: 0.125rem 0.375rem;
    background: var(--code-bg);
    border-radius: var(--radius-sm);
    color: var(--code-text);
}

/* Code blocks */
.post-content pre {
    margin: 1.25rem -1.5rem;
    padding: 0;
    background: var(--code-block-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border);
}

.post-content pre code {
    display: block;
    padding: 1.125rem 1.5rem;
    overflow-x: auto;
    font-size: 0.8125rem;
    line-height: 1.7;
    background: none;
    color: var(--text-primary);
    border-radius: 0;
    tab-size: 4;
}

.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.375rem 1.5rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border);
    font-size: 0.6875rem;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.code-copy-btn {
    font-size: 0.6875rem;
    color: var(--text-tertiary);
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-sans);
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    text-transform: none;
    letter-spacing: normal;
}

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

/* Blockquotes */
.post-content blockquote {
    margin: 1rem 0;
    padding: 0.25rem 0 0.25rem 1rem;
    border-left: 3px solid var(--quote-border);
    color: var(--text-primary);
}

.post-content blockquote p {
    margin: 0.25rem 0;
}

/* Images */
.post-content img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 1.25rem auto;
    border-radius: var(--radius-md);
}

.post-content p > img:only-child {
    margin: 1.25rem auto;
}

.post-content p:has(> img:only-child) {
    margin: 0;
}

/* Tables */
.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.9375rem;
}

.post-content th,
.post-content td {
    padding: 0.5rem 0.75rem;
    text-align: left;
    border: 1px solid var(--border);
}

.post-content th {
    background: var(--bg-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Horizontal rules */
.post-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2rem 0;
}

/* Strong and em */
.post-content strong {
    font-weight: 600;
}

/* Math */
.post-content .katex-display {
    margin: 1rem 0;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.5rem 0;
}

.post-content .katex {
    font-size: 1.05em;
}

.post-content .katex-display > .katex {
    font-size: 1.1em;
}

/* Annotations */
.annotation {
    text-decoration: underline;
    text-decoration-style: dotted;
    text-decoration-color: var(--text-tertiary);
    text-underline-offset: 3px;
    cursor: pointer;
    border-radius: 2px;
    transition: background-color var(--transition);
}

.annotation:hover,
.annotation.active {
    background-color: var(--accent-light);
    text-decoration-color: var(--accent);
}

.annotation-tooltip {
    position: absolute;
    z-index: 1000;
    max-width: 320px;
    padding: 0.75rem 1rem;
    background-color: var(--bg);
    color: var(--text-secondary);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    line-height: 1.5;
    animation: tooltip-fade-in 0.15s ease;
    pointer-events: auto;
}

@keyframes tooltip-fade-in {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Reading Page --- */
.reading-legend {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    margin-top: 0.5rem;
}

.legend-swatch {
    width: 14px;
    height: 10px;
    border: 2px solid var(--standout-border);
    border-radius: 2px;
}

.year-heading {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    padding: 1.5rem 0 0.5rem;
    letter-spacing: -0.01em;
}

.book-list {
    list-style: none;
    padding: 0;
}

.book-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    overflow: hidden;
    transition: border-color var(--transition);
}

.book-item.standout {
    border-color: var(--standout-border);
    border-width: 1.5px;
}

.book-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--bg);
    border: none;
    cursor: default;
    font-family: inherit;
    font-size: 0.9375rem;
    color: var(--text-primary);
    text-align: left;
    transition: background-color var(--transition);
}

.book-toggle.has-notes {
    cursor: pointer;
}

.book-toggle.has-notes:hover {
    background: var(--bg-hover);
}

.book-title {
    font-weight: 500;
    font-style: italic;
    flex: 1;
    min-width: 0;
}

.book-author {
    color: var(--text-secondary);
    font-size: 0.875rem;
    flex-shrink: 0;
    padding-left: 1rem;
}

.book-chevron {
    color: var(--text-tertiary);
    font-size: 0.75rem;
    transition: transform var(--transition);
    margin-left: 0.5rem;
    flex-shrink: 0;
}

.book-toggle.active .book-chevron {
    transform: rotate(180deg);
}

.book-content {
    display: none;
    border-top: 1px solid var(--border);
    background: var(--bg);
}

.book-content.active {
    display: block;
}

.book-content .post-content {
    padding: 1.5rem 2rem;
}

.book-content .post-content pre {
    margin-left: -0.5rem;
    margin-right: -0.5rem;
}

/* --- Back to Top --- */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 40px;
    height: 40px;
    background: var(--bg);
    color: var(--text-secondary);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

/* --- Loading & Error States --- */
.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-tertiary);
    font-size: 0.9375rem;
}

.error {
    text-align: center;
    padding: 2rem;
    color: #eb5757;
    background: rgba(235, 87, 87, 0.08);
    border: 1px solid rgba(235, 87, 87, 0.2);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
}

/* --- Table of Contents (hover-to-reveal) --- */
.toc-wrapper {
    position: fixed;
    right: calc((100vw - var(--content-width)) / 4 - 1rem);
    top: 50%;
    transform: translateY(-50%);
    z-index: 50;
}

.toc-trigger {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition);
    padding: 6px 7px;
    max-height: calc(100vh - 8rem);
    overflow: hidden;
}

.toc-line {
    display: block;
    height: 1.5px;
    border-radius: 1px;
    background: var(--text-tertiary);
    transition: background-color var(--transition);
    flex-shrink: 0;
}

.toc-line-h1 { width: 16px; }
.toc-line-h2 { width: 11px; }
.toc-line-h3 { width: 7px; }
.toc-line-h4 { width: 4px; }

.toc-line.active {
    background: var(--text-primary);
}

.toc-trigger:hover,
.toc-wrapper.active .toc-trigger {
    background: var(--bg-active);
}

.toc-trigger:hover .toc-line,
.toc-wrapper.active .toc-trigger .toc-line {
    background: var(--text-secondary);
}

.toc-trigger:hover .toc-line.active,
.toc-wrapper.active .toc-trigger .toc-line.active {
    background: var(--text-primary);
}

.toc-panel {
    position: absolute;
    right: calc(100% + 0.5rem);
    top: 50%;
    transform: translateY(-50%) translateX(8px);
    opacity: 0;
    pointer-events: none;
    width: 240px;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.75rem 0;
    transition: opacity 0.15s ease, transform 0.15s ease;
}

.toc-wrapper.active .toc-panel {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(-50%) translateX(0);
}

.toc-title {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
    padding: 0.25rem 1rem 0.5rem;
}

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

.toc-panel li a {
    display: block;
    font-size: 0.8125rem;
    line-height: 1.4;
    color: var(--text-secondary);
    padding: 0.25rem 1rem;
    text-decoration: none;
    transition: color var(--transition), background-color var(--transition);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.toc-panel li a:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.toc-panel li a.active {
    color: var(--text-primary);
    font-weight: 500;
}

.toc-panel li.toc-h2 a { padding-left: 1.75rem; }
.toc-panel li.toc-h3 a { padding-left: 2.5rem; }
.toc-panel li.toc-h4 a { padding-left: 3.25rem; }

.toc-panel::-webkit-scrollbar { width: 4px; }
.toc-panel::-webkit-scrollbar-track { background: transparent; }
.toc-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

@media (max-width: 1100px) {
    .toc-wrapper { display: none; }
}

/* --- Responsive --- */
@media (max-width: 768px) {
    :root {
        --page-padding: 1.25rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .post-title {
        font-size: 2rem;
    }

    .post-content h1 {
        font-size: 1.5rem;
    }

    .post-content h2 {
        font-size: 1.25rem;
    }

    .post-content h3 {
        font-size: 1.1rem;
    }

    .post-content pre {
        margin-left: calc(-1 * var(--page-padding));
        margin-right: calc(-1 * var(--page-padding));
        border-radius: 0;
        border-left: none;
        border-right: none;
    }

    .home-header h1 {
        font-size: 1.75rem;
    }

    .home-nav {
        flex-direction: column;
        width: 100%;
        max-width: 200px;
    }

    .home-nav-link {
        justify-content: center;
    }

    .back-to-top {
        bottom: 1.25rem;
        right: 1.25rem;
    }
}

/* --- Highlight.js overrides --- */
.hljs {
    background: transparent !important;
    color: var(--text-primary) !important;
}

/* Syntax highlighting - Light mode */
:root {
    --hljs-keyword: #d73a49;
    --hljs-string: #032f62;
    --hljs-number: #005cc5;
    --hljs-comment: #6a737d;
    --hljs-function: #6f42c1;
    --hljs-class: #005cc5;
    --hljs-variable: #e36209;
    --hljs-operator: #d73a49;
    --hljs-built-in: #005cc5;
    --hljs-attr: #005cc5;
    --hljs-punctuation: #24292e;
}

[data-theme="dark"] {
    --hljs-keyword: #ff7b72;
    --hljs-string: #a5d6ff;
    --hljs-number: #79c0ff;
    --hljs-comment: #8b949e;
    --hljs-function: #d2a8ff;
    --hljs-class: #79c0ff;
    --hljs-variable: #ffa657;
    --hljs-operator: #ff7b72;
    --hljs-built-in: #79c0ff;
    --hljs-attr: #79c0ff;
    --hljs-punctuation: #c9d1d9;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-deletion { color: var(--hljs-keyword) !important; }

.hljs-string,
.hljs-doctag,
.hljs-regexp,
.hljs-addition { color: var(--hljs-string) !important; }

.hljs-number,
.hljs-literal { color: var(--hljs-number) !important; }

.hljs-comment { color: var(--hljs-comment) !important; font-style: italic; }

.hljs-title,
.hljs-title.function_ { color: var(--hljs-function) !important; }

.hljs-title.class_,
.hljs-type { color: var(--hljs-class) !important; }

.hljs-variable,
.hljs-template-variable { color: var(--hljs-variable) !important; }

.hljs-built_in { color: var(--hljs-built-in) !important; }

.hljs-attr,
.hljs-attribute { color: var(--hljs-attr) !important; }

.hljs-punctuation { color: var(--hljs-punctuation) !important; }

.hljs-operator { color: var(--hljs-operator) !important; }

.hljs-meta { color: var(--hljs-keyword) !important; }

.hljs-params { color: var(--text-primary) !important; }

/* --- KaTeX overrides --- */
.katex-html {
    white-space: normal;
}

/* KaTeX error fallback */
.katex-error {
    color: var(--code-text);
    font-family: var(--font-mono);
    font-size: 0.875em;
}

/* --- Scrollbar styling for code blocks --- */
.post-content pre code::-webkit-scrollbar {
    height: 4px;
}

.post-content pre code::-webkit-scrollbar-track {
    background: transparent;
}

.post-content pre code::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}

.post-content pre code::-webkit-scrollbar-thumb:hover {
    background: var(--border-strong);
}

/* --- Smooth transitions for view switching --- */
#list-view,
#post-view {
    animation: fade-in 0.2s ease;
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* --- Home page toggle (centered below social links) --- */
.home-container .dark-mode-toggle {
    margin-top: 0.5rem;
}

/* --- Print styles --- */
@media print {
    .dark-mode-toggle,
    .back-to-top,
    .social-links,
    .nav,
    .post-back {
        display: none !important;
    }
}