/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
    /* Typography */
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'Geist', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

    /* Modular Scale */
    --step--1: 0.85rem;
    --step-0: 1rem;
    --step-1: 1.25rem;
    --step-2: 1.5625rem;
    --step-3: 1.953rem;
    --step-4: 2.441rem;
    --step-5: 3.052rem;

    --line-height-body: 1.7;
    --line-height-heading: 1.2;
    --line-height-code: 1.5;

    /* Light Mode Colors */
    --color-bg: #FAF9F7;
    --color-bg-elevated: #FFFFFF;
    --color-bg-subtle: #F3F1EE;
    --color-text: #1C1917;
    --color-text-secondary: #57534E;
    --color-text-muted: #A8A29E;
    --color-border: #E7E5E4;
    --color-border-subtle: #F0EEEC;

    /* Admonition Colors — GitHub Alerts */
    --color-note-border: #0969da;
    --color-note-bg: #cceaff;
    --color-note-text: #0550ae;
    --color-tip-border: #1a7f37;
    --color-tip-bg: #c4f5d6;
    --color-tip-text: #116329;
    --color-important-border: #8250df;
    --color-important-bg: #dedeff;
    --color-important-text: #6e40c9;
    --color-warning-border: #9a6700;
    --color-warning-bg: #fced9f;
    --color-warning-text: #7d4e00;
    --color-caution-border: #cf222e;
    --color-caution-bg: #fad6d4;
    --color-caution-text: #a40e26;

    /* Accent — Cobalt Blue */
    --color-accent: #2870C2;
    --color-accent-hover: #1A5AA8;
    --color-accent-subtle: #EBF3FF;
    --color-accent-muted: #7AB8E8;
    /* Brand accent — fixed cobalt, same in both themes (used where color must not shift) */
    --color-accent-brand: #2870C2;

    /* Links */
    --color-link: #2870C2;
    --color-link-hover: #1A7FFF;
    --color-link-visited: #78716C;

    /* Tags */
    --color-tag-bg: #EBF3FF;
    --color-tag-text: #1A5AA8;
    --color-tag-border: #AECFF5;

    /* Code */
    --color-code-bg: #F5F5F4;
    --color-code-text: #1C1917;

    /* Selection */
    --color-selection: #AECFF5;
    --color-selection-text: #1C1917;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.04);
    --shadow-md: 0 4px 12px rgba(28, 25, 23, 0.06);
    --shadow-lg: 0 12px 32px rgba(28, 25, 23, 0.08);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Layout */
    --max-width: 1100px;
    --content-width: 860px;
    --header-height: 80px;

    /* Icons */
    --icon-stroke-normal: 2;
    --icon-stroke-bold: 3;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Z-Index Ladder */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-backdrop: 300;
    --z-modal: 400;
    --z-toast: 500;
    --z-noise: 9999;

    color-scheme: light;
}

/* Dark Mode */
:root[data-theme="dark"] {
    color-scheme: dark;
    --color-bg: #0C0A09;
    --color-bg-elevated: #1C1917;
    --color-bg-subtle: #1C1917;
    --color-text: #FAFAF9;
    --color-text-secondary: #A8A29E;
    --color-text-muted: #78716C;
    --color-border: #292524;
    --color-border-subtle: #1C1917;

    --color-note-border: #1f6feb;
    --color-note-bg: #0d2d47;
    --color-note-text: #79c0ff;
    --color-tip-border: #238636;
    --color-tip-bg: #0a2e18;
    --color-tip-text: #56d364;
    --color-important-border: #8957e5;
    --color-important-bg: #21143d;
    --color-important-text: #d2a8ff;
    --color-warning-border: #9e6a03;
    --color-warning-bg: #2f2300;
    --color-warning-text: #e3b341;
    --color-caution-border: #da3633;
    --color-caution-bg: #2d0b0b;
    --color-caution-text: #ff7b72;

    --color-accent: #5A9FDE;
    --color-accent-hover: #7AB8E8;
    --color-accent-subtle: #0A1E3D;
    --color-accent-muted: #163E70;

    --color-link: #4D9FFF;
    --color-link-hover: #80BFFF;
    --color-link-visited: #A8A29E;

    --color-tag-bg: #0A1E3D;
    --color-tag-text: #7AB8E8;
    --color-tag-border: #163E70;

    --color-code-bg: #1C1917;
    --color-code-text: #FAFAF9;

    --color-selection: #163E70;
    --color-selection-text: #FAFAF9;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.4);
}

/* --------------------------------------------------------------------------
   Base & Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    overflow-y: scroll;
    overflow-x: clip;
}

body {
    font-family: var(--font-body);
    font-size: var(--step-0);
    line-height: var(--line-height-body);
    color: var(--color-text);
    background-color: var(--color-bg);
    margin: 0;
    padding: 0;
    /* lvh (large viewport height) locks the body to the maximum screen size. 
       This prevents jumping on scroll and forces the footer to the true bottom. */
    min-height: 100vh;
    min-height: 100lvh;
    width: 100%;
    /* overflow-x handled by html rule above */
    display: flex;
    flex-direction: column;
    /* No baseline transition on body — color transitions are opt-in via .theme-transition
       to avoid sluggish hover states and inadvertent color animations site-wide. */
}

/* Noise texture overlay — promoted to its own compositor layer for performance */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.02;
    z-index: var(--z-noise);
    /* will-change: transform promotes to compositor layer without wasting a layer for a static animation */
    will-change: transform;
    backface-visibility: hidden;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

::selection {
    background-color: var(--color-selection);
    color: var(--color-selection-text);
}

/* Screen-reader-only utility — visually hidden but announced by AT */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}


/* --------------------------------------------------------------------------
   Container & Layout
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

header,
main,
footer {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
}

main {
    flex: 1;
    padding-top: var(--space-xl);
    padding-bottom: var(--space-3xl);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1,
h2,
h3,
h4 {
    font-family: var(--font-display);
    font-weight: 400;
    color: var(--color-text);
    line-height: var(--line-height-heading);
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

h5,
h6 {
    color: var(--color-text);
    line-height: var(--line-height-heading);
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
    /* body-weight headings — use normal tracking, not display negative */
    letter-spacing: normal;
}

h1 {
    font-size: var(--step-4);
    margin-top: 0;
}

h2 {
    font-size: var(--step-3);
}

h3 {
    font-size: var(--step-2);
}

.filter-header {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-md);
}

.filter-heading {
    margin-bottom: 0;
}

.filter-clear {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-accent-muted);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.filter-clear svg {
    width: 14px;
    height: 14px;
}

.filter-clear:hover {
    color: var(--color-text);
    background-color: var(--color-accent-subtle);
    border-color: var(--color-accent);
    text-decoration: none;
    transform: translateY(-1.5px);
}

.text-accent {
    color: var(--color-accent);
}

.also-found-header {
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
    font-size: var(--step--1);
    color: var(--color-text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.cross-tax-heading {
    margin-top: 0;
    font-size: var(--step-1);
}

h4 {
    font-size: var(--step-1);
}

h5,
h6 {
    font-size: var(--step-0);
    font-family: var(--font-body);
    font-weight: 600;
}

p {
    margin-top: 0;
    margin-bottom: var(--space-lg);
}

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

/* --------------------------------------------------------------------------
   Links
   -------------------------------------------------------------------------- */
a {
    color: var(--color-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-link-hover);
}

/* Underline style for content links */
article a:not(.tag):not(.zola-anchor),
main p a:not(.tag),
main li a:not(.tag) {
    text-decoration: underline;
    text-decoration-color: var(--color-accent-muted);
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
}

article a:not(.tag):not(.zola-anchor):hover,
main p a:not(.tag):hover,
main li a:not(.tag):hover {
    text-decoration-color: var(--color-link-hover);
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
header {
    padding-top: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border-subtle);
}

.title {
    text-decoration: none;
    display: inline-block;
}

.title:hover {
    opacity: 0.8;
}

.name {
    font-family: var(--font-display);
    font-size: 2rem;
    /* Instrument Serif only ships weight 400; browser synthesises bold — intentional design choice */
    font-weight: 600;
    margin: 0 0 var(--space-lg) 0;
    letter-spacing: 0.05em;
    color: var(--color-text);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
}

.mobile-menu-btn,
.mobile-close-btn,
.mobile-menu-backdrop {
    display: none;
}

.nav-items {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: var(--space-xs);
}

.nav-items a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.nav-items a svg {
    width: 14px;
    height: 14px;
}

.nav-items a:hover {
    color: var(--color-text);
    background-color: var(--color-accent-subtle);
    border-color: var(--color-accent);
    transform: translateY(-1.5px);
}

.nav-items a.active {
    color: var(--color-text);
}

/* Search Button */
.search-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    height: 40px;
    padding: 0 6px;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    flex-shrink: 0;
    margin-left: var(--space-xs);
}

.search-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
    background-color: var(--color-accent-subtle);
    transform: translateY(-1.5px);
}

.search-btn i,
.search-btn svg {
    width: 18px;
    height: 18px;
    opacity: 0.8;
}

.search-btn-shortcut {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    padding: 1px 3px;
    background: var(--color-border-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    opacity: 0.8;
}

@media screen and (max-width: 768px) {
    .search-btn {
        width: 40px;
        padding: 0;
        justify-content: center;
    }
    .search-btn-shortcut {
        display: none;
    }
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.theme-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
    background-color: var(--color-accent-subtle);
    transform: translateY(-1.5px);
}

.theme-toggle i,
.theme-toggle svg {
    width: 18px;
    height: 18px;
}

/* Search Modal */
.search-modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 12vh;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.search-modal.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.search-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: opacity 0.2s ease;
}

.search-modal-content {
    position: relative;
    width: 90%;
    max-width: 640px;
    max-height: 70vh;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: translateY(-10px) scale(0.98);
    transition: transform 0.2s ease, opacity 0.2s ease;
    opacity: 0;
}

.search-modal.active .search-modal-content {
    transform: translateY(0) scale(1);
    opacity: 1;
}

.search-modal-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.search-input-wrapper {
    display: flex;
    align-items: center;
    flex: 1;
    gap: var(--space-md);
}

.search-input-icon {
    width: 20px;
    height: 20px;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    min-width: 0;
    border: none;
    background: transparent;
    font-size: 1.125rem;
    font-family: var(--font-body);
    color: var(--color-text);
    outline: none;
    padding: var(--space-xs) var(--space-sm);
}

.search-input:focus {
    outline: 1px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

.search-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-subtle);
    color: var(--color-text-secondary);
    cursor: pointer;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.search-close:hover {
    background-color: var(--color-accent-subtle);
    color: var(--color-text);
    border-color: var(--color-accent);
    transform: translateY(-1.5px);
}

.search-close svg {
    width: 16px;
    height: 16px;
}

.search-results {
    overflow-y: auto;
    padding: var(--space-sm);
    max-height: calc(70vh - 80px);
}

.search-empty-state {
    padding: var(--space-md);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9375rem;
}

.search-group {
    margin-bottom: var(--space-md);
}

.search-group:last-child {
    margin-bottom: 0;
}

.search-group-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    padding: var(--space-xs) var(--space-sm);
    margin: 0 0 var(--space-xs) 0;
}

.search-group-count {
    font-weight: 400;
    color: var(--color-text-muted);
}

.search-result-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--color-text);
    transition: background-color var(--transition-fast);
    cursor: pointer;
}

.search-result-item:hover,
.search-result-item:focus {
    background-color: var(--color-border);
    outline: none;
}

/* Note: dark-mode hover resolves to the same token — no override needed */

.search-result-title {
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--color-text);
}

.search-result-item:hover .search-result-title,
.search-result-item:focus .search-result-title {
    color: var(--color-link);
}

.search-result-desc {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Dark mode adjustments */
:root[data-theme="dark"] .search-modal-backdrop {
    background: rgba(0, 0, 0, 0.7);
}

:root[data-theme="dark"] .search-modal-content {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* --------------------------------------------------------------------------
   Home Page
   -------------------------------------------------------------------------- */
.home-container {
    display: flex;
    align-items: center;
    gap: var(--space-2xl);
    margin-bottom: calc(var(--space-2xl) + var(--space-lg));
}

.home-title {
    font-size: var(--step-3);
    font-weight: 400;
}

.cli-prompt {
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-weight: 700;
}

.home-content p:last-of-type {
    margin-bottom: 0;
}


.home-content {
    flex: 1;
}


.home-content p:first-of-type {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

main > h2 + p {
    color: var(--color-text-secondary);
}

.featured-subtitle {
    margin-left: var(--space-xl);
}

.featured-posts-list {
    padding-left: var(--space-xl);
}

.home-image {
    flex-shrink: 0;
    width: 140px;
    transform: translateY(-1rem);
}

.img-rounded {
    width: 100%;
    border-radius: var(--radius-full);
    border: 2px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.img-rounded:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* --------------------------------------------------------------------------
   Blog Post Lists
   -------------------------------------------------------------------------- */
ul.blog-posts {
    list-style: none;
    padding: 0;
    margin: 0;
}

ul.blog-posts li {
    display: flex;
    align-items: baseline;
    gap: var(--space-lg);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border-subtle);
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast);
}

ul.blog-posts li:last-child {
    border-bottom: none;
}

ul.blog-posts li:hover {
    background-color: var(--color-border);
    margin-left: calc(-1 * var(--space-md));
    margin-right: calc(-1 * var(--space-md));
    padding-left: var(--space-md);
    padding-right: var(--space-md);
    border-radius: var(--radius-sm);
    border-bottom-color: transparent;
}

ul.blog-posts li:has(+ li:hover) {
    border-bottom-color: transparent;
}

/* --------------------------------------------------------------------------
   Topics UI
   -------------------------------------------------------------------------- */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.8rem;
    margin-top: 3rem;
}

.topic-pill {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 0.8rem;
    background-color: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-family: var(--font-mono);
    transition: all var(--transition-base);
}

.topic-pill:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
    background-color: var(--color-accent-subtle);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--color-shadow);
}

:root[data-theme="dark"] ul.blog-posts li:hover {
    background-color: var(--color-border);
}

ul.blog-posts li span:not(.draft-tag):not(.category-badge) {
    flex: 0 0 110px;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}

ul.blog-posts li a {
    color: var(--color-text);
    font-weight: 500;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul.blog-posts li a:visited {
    color: var(--color-text);
}

ul.blog-posts li a:hover {
    color: var(--color-link);
}

/* --------------------------------------------------------------------------
   Article / Post Page
   -------------------------------------------------------------------------- */
article, .post-content {
    line-height: 1.75;
    color: var(--color-text-secondary);
    text-wrap: pretty;
}

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

@media screen and (min-width: 769px) {
    .post-content.restricted-width {
        max-width: var(--content-width);
        margin: 0 auto;
    }
    
    .tags.restricted-width {
        max-width: var(--content-width);
        margin-left: auto;
        margin-right: auto;
    }
}

/* Base rule (all screen sizes) — critical for mobile horizontal scroll */
.table-responsive-wrapper {
    overflow-x: auto;
    margin-bottom: var(--space-lg);
}

article h1 {
    font-size: var(--step-4);
    margin-bottom: var(--space-lg);
    text-align: center;
    word-break: break-word;
    overflow-wrap: break-word;
}

.meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--space-lg);
    margin-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.post-date,
.reading-time {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* Table of Contents */
.toc {
    background-color: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-lg);
    overflow: hidden;
}

.toc.restricted-width {
    max-width: var(--content-width);
    margin-left: auto;
    margin-right: auto;
}

.toc-title {
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-body);
    font-weight: 450;
    font-size: var(--step-0);
    color: var(--color-text-secondary);
    cursor: pointer;
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color var(--transition-fast);
}

.toc-title:hover {
    color: var(--color-link);
}

.toc-icon {
    transition: transform 0.3s ease, color var(--transition-fast);
    color: var(--color-text-muted);
    width: 22px;
    height: 22px;
}

.toc-title:hover .toc-icon {
    color: var(--color-link);
}

.toc.is-open .toc-icon {
    transform: rotate(180deg);
}

.toc-content {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.3s ease-out;
}

.toc.is-open .toc-content {
    grid-template-rows: 1fr;
}

.toc-inner {
    overflow: hidden;
    padding: 0 var(--space-lg);
    opacity: 0;
    transition: opacity 0.3s ease-out, padding 0.3s ease-out;
}

.toc.is-open .toc-inner {
    padding: 0 var(--space-lg) var(--space-sm) var(--space-lg);
    opacity: 1;
}

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

.toc ul ul {
    padding-left: var(--space-lg);
    margin-top: var(--space-xs);
}

.toc li {
    margin-bottom: var(--space-xs);
    line-height: 1.4;
}

.toc li:last-child {
    margin-bottom: 0;
}

.toc a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.toc a:hover {
    color: var(--color-link);
}

/* Section Headers */
.section-header {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border-subtle);
}

.section-header h1 {
    margin-bottom: var(--space-sm);
}

.section-description {
    font-size: var(--step-0);
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

/* Anchor Links */
h2,
h3,
h4,
h5,
h6 {
    position: relative;
}

.zola-anchor {
    font-family: var(--font-mono);
    font-size: 0.75em;
    font-weight: 400;
    color: var(--color-text-muted);
    text-decoration: none;
    margin-left: var(--space-sm);
    opacity: 0;
    transition: opacity var(--transition-fast), color var(--transition-fast);
    vertical-align: middle;
}

h2:hover .zola-anchor,
h3:hover .zola-anchor,
h4:hover .zola-anchor,
h5:hover .zola-anchor,
h6:hover .zola-anchor {
    opacity: 0.5;
}

.zola-anchor:hover {
    opacity: 1;
    color: var(--color-link);
}

/* --------------------------------------------------------------------------
   Tags
   -------------------------------------------------------------------------- */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin: var(--space-lg) 0;
}

.tags>a,
a.tag {
    display: inline-flex;
    align-items: center;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-tag-text);
    background-color: var(--color-tag-bg);
    border: 1px solid var(--color-tag-border);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-fast);
    text-transform: lowercase;
}

.tags>a:hover,
a.tag:hover {
    background-color: var(--color-accent-subtle);
    border-color: var(--color-accent);
    color: var(--color-text);
    transform: translateY(-1.5px);
}

:root[data-theme="dark"] .tags>a:hover,
:root[data-theme="dark"] a.tag:hover {
    border-color: var(--color-accent-hover);
}

/* Section Tags (bottom of section pages) */
.section-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border-subtle);
}

.section-tags a {
    text-transform: lowercase;
}

/* --------------------------------------------------------------------------
   Code & Pre
   -------------------------------------------------------------------------- */
code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    font-weight: 400;
    background-color: var(--color-bg-subtle);
    color: var(--color-code-text);
    border: 1px solid var(--color-border);
    padding: 0.2em 0.45em;
    border-radius: var(--radius-sm);
    -webkit-font-smoothing: antialiased;
}

/* Code block container */
pre {
    position: relative;
    border-radius: var(--radius-lg);
    /* overflow: hidden removed to allow sticky copy button */
    margin: var(--space-xl) 0;
    box-shadow:
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06);
    color-scheme: light !important;
    display: grid;
}

:root[data-theme="dark"] pre {
    color-scheme: dark !important;
}

/* Code inside pre */
pre code {
    grid-area: 1 / 1;
    display: block;
    padding: var(--space-lg) var(--space-xl);
    font-size: 0.875rem;
    line-height: var(--line-height-code);
    white-space: pre;
    background: transparent;
    border: none;
    border-radius: 0;
    overflow-x: auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "liga" 1, "calt" 1;
    /* Enable ligatures */
}

/* Scrollbar styling for code blocks */
pre code::-webkit-scrollbar {
    height: 8px;
}

pre code::-webkit-scrollbar-track {
    background: rgba(128, 128, 128, 0.1);
    border-radius: 4px;
}

pre code::-webkit-scrollbar-thumb {
    background: rgba(128, 128, 128, 0.3);
    border-radius: 4px;
}

pre code::-webkit-scrollbar-thumb:hover {
    background: rgba(128, 128, 128, 0.5);
}


/* Line numbers (if enabled) */
pre .line-number {
    opacity: 0.4;
    user-select: none;
    padding-right: var(--space-md);
    text-align: right;
    min-width: 2.5em;
}

/* Copy Code Button */
.copy-code-btn {
    grid-area: 1 / 1;
    position: sticky;
    top: var(--space-sm);
    justify-self: end;
    align-self: start;
    margin-top: var(--space-sm);
    margin-right: var(--space-sm);
    margin-bottom: var(--space-md);
    z-index: var(--z-dropdown);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background-color: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-base),
                background-color var(--transition-fast),
                color var(--transition-fast),
                border-color var(--transition-fast);
}

pre:hover .copy-code-btn,
.copy-code-btn:focus,
.copy-code-btn.copied {
    opacity: 1;
}

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

.copy-code-btn.copied {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.copy-code-btn svg,
.copy-code-btn i {
    width: 18px;
    height: 18px;
}

/* --------------------------------------------------------------------------
   Blockquote
   -------------------------------------------------------------------------- */
blockquote {
    margin: var(--space-xl) 0;
    padding: var(--space-md) var(--space-lg);
    border-left: 3px solid var(--color-accent);
    background-color: var(--color-bg-subtle);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--color-text-secondary);
    font-style: italic;
}

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

/* --------------------------------------------------------------------------
   Admonitions — GitHub-style Alerts
   -------------------------------------------------------------------------- */
.admonition {
    margin: var(--space-xl) 0;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-border);
    background-color: transparent;
    font-style: normal;
}

.admonition .admonition-header {
    display: flex;
    align-items: center;
    gap: 0.5em;
    font-weight: 600;
    font-size: 0.9375rem;
    margin-bottom: var(--space-xs);
    text-transform: none;
    letter-spacing: normal;
}

.admonition .admonition-header svg {
    flex-shrink: 0;
    width: 1em;
    height: 1em;
}

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

/* Note — Blue */
.admonition.note {
    background-color: var(--color-note-bg);
    border-color: var(--color-note-border);
}

.admonition.note .admonition-header {
    color: var(--color-note-text);
}

/* Tip — Green */
.admonition.tip {
    background-color: var(--color-tip-bg);
    border-color: var(--color-tip-border);
}

.admonition.tip .admonition-header {
    color: var(--color-tip-text);
}

/* Important — Purple */
.admonition.important {
    background-color: var(--color-important-bg);
    border-color: var(--color-important-border);
}

.admonition.important .admonition-header {
    color: var(--color-important-text);
}

/* Warning — Amber */
.admonition.warning {
    background-color: var(--color-warning-bg);
    border-color: var(--color-warning-border);
}

.admonition.warning .admonition-header {
    color: var(--color-warning-text);
}

/* Caution — Red */
.admonition.caution {
    background-color: var(--color-caution-bg);
    border-color: var(--color-caution-border);
}

.admonition.caution .admonition-header {
    color: var(--color-caution-text);
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */
table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-lg) 0;
    font-size: 0.9375rem;
}

th,
td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

th {
    font-weight: 600;
    text-align: left;
    color: var(--color-text);
    background-color: var(--color-bg-subtle);
}

td {
    text-align: left;
}

tr:hover td {
    background-color: var(--color-accent-subtle);
}

/* --------------------------------------------------------------------------
   Images & Figures
   -------------------------------------------------------------------------- */
img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

iframe {
    max-width: 100% !important;
    display: block;
}

figure {
    margin: var(--space-xl) 0;
    padding: 0;
    background: transparent;
    box-shadow: none;
}

figure img {
    display: block;
    width: 100%;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

figure img:hover {
    transform: scale(1.01);
    box-shadow: var(--shadow-lg);
}

figcaption {
    text-align: center;
    margin-top: var(--space-sm);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* Image Grid */
.image-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin: var(--space-xl) 0;
}

.image-grid a {
    display: block;
    overflow: hidden;
    border-radius: var(--radius-md);
}

.image-grid img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-md);
    transition: transform var(--transition-base);
}

.image-grid a:hover img {
    transform: scale(1.03);
}

.image-grid a:nth-child(odd):last-child {
    grid-column: 1 / -1;
    max-width: 50%;
    margin: 0 auto;
}

/* --------------------------------------------------------------------------
   Lightbox
   -------------------------------------------------------------------------- */
.lightbox-modal {
    display: none;
    position: fixed;
    z-index: var(--z-modal);
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(12, 10, 9, 0.95);
    cursor: pointer;
    backdrop-filter: blur(8px);
}

.lightbox-modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn var(--transition-base);
}

.lightbox-modal img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    animation: zoomIn var(--transition-base);
    cursor: default;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}

.lightbox-close {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-xl);
    color: var(--color-text);
    font-size: 2rem;
    font-weight: 300;
    cursor: pointer;
    transition: opacity var(--transition-fast);
    opacity: 0.7;
    background: none;
    border: none;
    padding: 0;
}

.lightbox-close:hover {
    opacity: 1;
}

.lightbox-thumbnail {
    cursor: zoom-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes zoomIn {
    from {
        transform: scale(0.95);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* --------------------------------------------------------------------------
   Projects
   -------------------------------------------------------------------------- */
.projects-section {
    width: 100%;
}

.projects-section h2 {
    font-size: 1.5rem;
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.projects-section h2:first-child {
    margin-top: 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    display: flex;
    flex-direction: column;
    padding: var(--space-lg);
    background-color: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.project-card:hover {
    border-color: var(--color-accent-brand);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.project-card.featured {
    position: relative;
}

.project-card.featured::after {
    content: "Featured";
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: white;
    background-color: var(--color-accent-brand);
    padding: 3px 12px;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--space-sm);
}

.project-name {
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1.125rem;
    margin: 0;
    color: var(--color-text);
}

.project-stars,
.project-forks {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    display: flex;
    align-items: center;
    gap: 4px;
    line-height: 1;
}

.project-stats {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.project-stars svg,
.project-stars i,
.project-forks svg,
.project-forks i {
    width: 13px;
    height: 13px;
    color: var(--color-accent);
    stroke-width: var(--icon-stroke-normal);
}

.project-desc {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin: 0 0 var(--space-md) 0;
    line-height: 1.6;
    flex: 1;
}

.project-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.project-lang {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--color-text-muted);
    padding: var(--space-xs) var(--space-sm);
    background-color: var(--color-bg-elevated);
    border-radius: var(--radius-sm);
}

:root[data-theme="dark"] .project-lang {
    background-color: var(--color-border);
}

.project-links {
    display: flex;
    gap: var(--space-sm);
    margin-left: auto;
}

.project-links a {
    font-size: 0.875rem;
    color: var(--color-link);
    text-decoration: none;
}

.project-links a:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}



/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */
input,
textarea {
    font-family: var(--font-body);
    font-size: 1rem;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg-elevated);
    color: var(--color-text);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

textarea {
    width: 100%;
    min-height: 120px;
    resize: vertical;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
footer {
    /* padding-left/right are handled by the shared header,main,footer rule */
    padding-top: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-top: 1px solid var(--color-border-subtle);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.footer-left,
.footer-right {
    flex: 1;
}

.footer-left {
    text-align: left;
}

.footer-center {
    flex: 1;
    text-align: center;
    white-space: nowrap;
}

.footer-right {
    display: flex;
    justify-content: flex-end;
}

.social-links {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    margin-top: 0;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--color-text-muted);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.social-icon:hover {
    color: var(--color-text);
    background-color: var(--color-accent-subtle);
    border-color: var(--color-accent);
    transform: translateY(-1.5px);
}

.social-icon svg,
.social-icon i {
    width: 20px;
    height: 20px;
}

@media screen and (max-width: 600px) {
    .footer-inner {
        flex-direction: column;
        text-align: center;
        gap: var(--space-sm);
    }

    .footer-left,
    .footer-center,
    .footer-right {
        flex: none;
        width: 100%;
        text-align: center;
    }

    .footer-right,
    .social-links {
        justify-content: center;
    }
}

/* --------------------------------------------------------------------------
   YouTube Embeds
   -------------------------------------------------------------------------- */
.youtube-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    margin: var(--space-xl) 0;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.youtube-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
    border-radius: var(--radius-md);
}

/* --------------------------------------------------------------------------
   Lists
   -------------------------------------------------------------------------- */
ul,
ol {
    padding-left: var(--space-lg);
    margin-bottom: var(--space-lg);
}

li {
    margin-bottom: var(--space-sm);
}

li::marker {
    color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Horizontal Rule
   -------------------------------------------------------------------------- */
hr {
    border: none;
    height: 1px;
    background: var(--color-border);
    margin: var(--space-2xl) 0;
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

main {
    animation: fadeInUp 0.5s ease-out;
}

/* Respect OS-level reduced-motion preference.
   Targets only named animations defined on this site — NOT a wildcard rule,
   which would clobber the browser's built-in cursor-blink animation. */
@media (prefers-reduced-motion: reduce) {
    main {
        animation: none;
    }

    .lightbox-modal.active,
    .lightbox-modal img {
        animation: none;
    }

    .theme-toggle,
    .search-btn,
    .search-close,
    .search-modal-content,
    .search-result-item,
    .back-to-top,
    .tags > a,
    a.tag,
    .project-card,
    .social-icon,
    .img-rounded,
    figure img,
    .nav-items,
    .mobile-menu-backdrop,
    .pagination-btn,
    .pagination-number,
    .copy-code-btn {
        transition: none;
    }
}

/* Theme transition — instant opacity crossfade via GPU compositor.
   This masks all DOM changes (Shiki re-render, CSS var updates, Mermaid
   re-draws) behind a single layer operation — no per-element repaints. */
.theme-transition,
.theme-transition * {
    transition: none !important;
}

/* --------------------------------------------------------------------------
   Back to Top Button
   -------------------------------------------------------------------------- */
.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    z-index: var(--z-sticky);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border: 2px solid var(--color-accent-muted);
    border-radius: var(--radius-md);
    background-color: var(--color-bg-elevated);
    color: var(--color-text-muted);
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity var(--transition-base),
                transform var(--transition-base),
                border-color var(--transition-fast),
                color var(--transition-fast),
                background-color var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.back-to-top:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
    background-color: var(--color-accent-subtle);
    transform: translateY(-1.5px);
}

.back-to-top svg {
    width: 18px;
    height: 18px;
}

/* --------------------------------------------------------------------------
   Focus-Visible Styles (keyboard navigation)
   -------------------------------------------------------------------------- */
.theme-toggle:focus-visible,
.search-btn:focus-visible,
.mobile-menu-btn:focus-visible,
.mobile-close-btn:focus-visible,
.back-to-top:focus-visible,
.copy-code-btn:focus-visible,
.search-close:focus-visible,
.social-icon:focus-visible,
.pagination-btn:focus-visible,
.pagination-number:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

@media screen and (max-width: 768px) {
    .back-to-top {
        bottom: var(--space-lg);
        right: var(--space-md);
        width: 38px;
        height: 38px;
    }
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media screen and (max-width: 768px) {
    :root {
        --max-width: 100%;
    }

    html {
        font-size: 15px;
    }

    h1 { font-size: calc(var(--step-4) * 0.9); }

    h2 { font-size: calc(var(--step-3) * 0.9); }

    header {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    nav {
        width: 100%;
        justify-content: space-between;
    }

    .name {
        font-size: 1.75rem;
        margin-bottom: var(--space-md);
    }

    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        background: var(--color-bg-subtle);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        cursor: pointer;
        color: var(--color-text-secondary);
        transition: all var(--transition-fast);
    }
    
    .mobile-menu-btn:hover {
        border-color: var(--color-accent);
        color: var(--color-text);
        background-color: var(--color-accent-subtle);
        transform: translateY(-1.5px);
    }

    .mobile-close-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 32px;
        height: 32px;
        background: var(--color-bg-subtle);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-sm);
        cursor: pointer;
        color: var(--color-text-secondary);
        margin-bottom: var(--space-xl);
        align-self: flex-end;
        order: -2;
        transition: all var(--transition-fast);
    }

    .mobile-close-btn:hover,
    .mobile-close-btn:active {
        border-color: var(--color-accent);
        color: var(--color-text);
        background-color: var(--color-accent-subtle);
        transform: translateY(-1.5px);
    }

    .mobile-menu-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
        z-index: var(--z-backdrop);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease, visibility 0.3s ease;
    }

    :root[data-theme="dark"] .mobile-menu-backdrop {
        background: rgba(0, 0, 0, 0.7);
    }

    .mobile-menu-backdrop.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-items {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 280px;
        max-width: 80vw;
        background: var(--color-bg);
        z-index: var(--z-modal);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--space-xl) var(--space-lg);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        box-shadow: var(--shadow-lg);
        border-right: 1px solid var(--color-border);
        gap: var(--space-sm);
    }

    .nav-items.active {
        transform: translateX(0);
    }

    .nav-items a {
        width: 100%;
        padding: var(--space-sm);
        border-radius: var(--radius-sm);
        font-size: 1rem;
    }

    .search-btn {
        margin-top: 0;
        margin-bottom: var(--space-md);
        margin-left: 0;
        width: 40px;
        order: -1;
        align-self: center;
    }

    header,
    main,
    footer {
        padding-left: var(--space-md);
        padding-right: var(--space-md);
    }

    .home-container {
        flex-direction: column-reverse;
        align-items: center;
        text-align: center;
        gap: var(--space-lg);
    }

    .home-image {
        width: 120px;
        transform: none;
    }

    ul.blog-posts li {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }

    ul.blog-posts li a {
        font-size: 1.1rem;
        text-wrap: pretty;
    }

    ul.blog-posts li span:not(.draft-tag):not(.category-badge) {
        flex: none;
    }

    ul.blog-posts li:hover {
        margin-left: 0;
        margin-right: 0;
        padding-left: var(--space-sm);
        padding-right: var(--space-sm);
    }

    .meta {
        flex-direction: column;
        align-items: center;
        gap: var(--space-xs);
    }


    .projects-grid {
        grid-template-columns: 1fr;
    }

    .image-grid {
        grid-template-columns: 1fr;
    }

    .image-grid a:nth-child(odd):last-child {
        grid-column: auto;
        max-width: 100%;
    }
}

@media screen and (max-width: 480px) {
    h1 { font-size: var(--step-3); }

    article h1 { 
        font-size: var(--step-3); 
        text-wrap: balance;
    }

    .theme-toggle {
        width: 36px;
        height: 36px;
    }
}

/* --------------------------------------------------------------------------
   Draft Banner
   -------------------------------------------------------------------------- */
.draft-banner {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    margin-bottom: var(--space-xl);
    background: linear-gradient(135deg, #F4F9FF 0%, #EBF3FF 100%);
    border: 2px dashed var(--color-accent);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

:root[data-theme="dark"] .draft-banner {
    background: linear-gradient(135deg, #292524 0%, #44403C 100%);
    border-color: var(--color-accent);
}

.draft-icon {
    font-size: 1.25rem;
}

.draft-text {
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 0.1em;
}

.draft-note {
    color: var(--color-text-secondary);
    font-weight: 400;
}

.draft-tag {
    display: inline-block;
    margin-left: var(--space-sm);
    padding: 2px 6px;
    font-size: 0.6875rem;
    font-weight: 600;
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
    color: var(--color-text);
    background-color: var(--color-tag-bg);
    border: 1px dashed var(--color-accent);
    border-radius: var(--radius-sm);
    vertical-align: middle;
}

.category-badge {
    display: inline-block;
    margin-left: 0.5rem;
    padding: 0.15rem 0.4rem;
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    vertical-align: middle;
}

@media screen and (max-width: 480px) {
    .draft-banner {
        flex-wrap: wrap;
        justify-content: center;
        text-align: center;
        gap: var(--space-xs) var(--space-sm);
    }
    .draft-note {
        width: 100%;
    }
}

/* --------------------------------------------------------------------------
   Pagination
   -------------------------------------------------------------------------- */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    font-family: var(--font-body);
}

.pagination-btn,
.pagination-number {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--space-xs);
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
}

.pagination-btn {
    padding: 0 var(--space-md);
}

.pagination-btn:hover:not(.disabled),
.pagination-number:hover:not(.disabled) {
    border-color: var(--color-accent);
    color: var(--color-text);
    background-color: var(--color-accent-subtle);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1.5px);
}

.pagination-btn.disabled,
.pagination-number.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: transparent;
    color: var(--color-text-muted);
    pointer-events: none;
}

.pagination-ellipsis {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 36px;
    color: var(--color-text-muted);
    font-weight: 500;
}

.pagination-numbers {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0 var(--space-sm);
}

.pagination-number.active {
    border-color: var(--color-accent);
    color: var(--color-text);
    background-color: var(--color-accent-subtle);
    font-weight: 700;
    cursor: default;
}

@media screen and (max-width: 600px) {
    .pagination {
        flex-wrap: wrap;
    }
    .pagination-numbers {
        order: -1;
        width: 100%;
        justify-content: center;
        margin: 0;
    }
    /* Target 'Prev' button (2nd child) to separate it from 'Next' */
    .pagination > *:nth-child(2) {
        /* Total gap = 36px (width of page button). margin-right = 36px - 12px (flex gap) */
        margin-right: 24px;
    }
    .pagination-btn {
        padding: 0 1.25rem;
    }
}

/* --------------------------------------------------------------------------
   AJAX Pagination
   -------------------------------------------------------------------------- */
.pagination-container {
    transition: opacity var(--transition-fast);
}

.pagination-container.loading {
    opacity: 0.5;
    pointer-events: none;
}

/* --------------------------------------------------------------------------
   Empty State
   -------------------------------------------------------------------------- */
.empty-state-item {
    padding: var(--space-xl) 0;
    border-bottom: none;
}

.empty-state {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    font-style: italic;
}

/* --------------------------------------------------------------------------
   404 Page
   -------------------------------------------------------------------------- */
main:has(.page-404-content) {
    display: flex;
    flex-direction: column;
    padding-top: 0;
    padding-bottom: 0;
}

.page-404-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: var(--space-sm);
}

.page-404-content h1 {
    font-size: 5rem;
    margin-bottom: var(--space-sm);
}

.page-404-subtitle {
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--space-lg);
}

.page-404-content a i,
.page-404-content a svg {
    width: 16px;
    height: 16px;
    vertical-align: middle;
    margin-right: 4px;
    transition: color var(--transition-fast);
}

.page-404-content a:hover i,
.page-404-content a:hover svg {
    color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Suppress table margin when inside responsive wrapper (set via JS)
   -------------------------------------------------------------------------- */
table.in-wrapper {
    margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
    body::before {
        display: none;
    }

    header,
    footer,
    .theme-toggle {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    a {
        color: black;
        text-decoration: underline;
    }

    pre,
    code {
        border: 1px solid var(--color-border);
    }
}

/* ==========================================================================
   Sitemap Styles
   ========================================================================== */

.sitemap-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.sitemap-items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.sitemap-item-card {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-decoration: none;
    color: var(--color-text-secondary);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
    min-height: 4rem;
}

.sitemap-item-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
    background-color: var(--color-accent-subtle);
    color: var(--color-text);
}

.sitemap-item-title {
    font-size: 0.9375rem;
    font-weight: 500;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--color-text-secondary);
}

.sitemap-item-card:hover .sitemap-item-title {
    color: var(--color-text);
}

.sitemap-item-badge {
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.55rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: white;
    background-color: var(--color-accent-brand);
    padding: 2px 8px;
    border-radius: 9999px;
    box-shadow: var(--shadow-sm);
    white-space: nowrap;
}

.sitemap-item-title svg,
.sitemap-item-title i {
    width: 14px;
    height: 14px;
    stroke-width: var(--icon-stroke-bold);
    display: inline-block;
    vertical-align: middle;
    margin-right: 6px;
    margin-bottom: 2px;
}