/* BuzzYbis Personal Presentation & Blog Theme */
/* ==========================================================================
   Design System & Theme Tokens
   ========================================================================== */

:root {
  /* Typography */
  --font-sans: 'Atkinson Hyperlegible Next', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'STIX Two Text', 'STIX2', Georgia, serif;
  --font-mono: 'JuliaMono', Menlo, Monaco, Consolas, monospace;
  --font-math: 'STIX Two Math', 'STIX Two Text', serif;

  /* E-Ink Paper Palette (Cool neutral e-paper, glare-free, matte, high contrast) */
  --bg: #EAEAE5;
  --bg-surface: #DFDFDB;
  --bg-subtle: #D6D6D0;
  --text: #1A1A1A;
  --text-muted: #767670;
  --text-dim: #91918d;

  /* Borders & Rules (Crisp neutral pencil rules harmonised with the palette) */
  --border: #C8C8C2;
  --border-subtle: #D2D2CC;
  --accent: #1A1A1A;

  /* Interactive Elements */
  --link: #1A1A1A;
  --link-hover: #000000;
  --link-border: #767670;

  /* Code Blocks & Tags */
  --code-bg: #F4F4F0;
  --code-border: #D8D8D2;
  --tag-bg: #DFDFDB;
  --tag-text: #1A1A1A;

  /* Elevation (Clean, flat e-paper lines without blurred drop shadows) */
  --shadow-sm: none;
  --shadow-md: none;
  --max-w: 780px;
}

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

html {
  font-size: 16px;
  line-height: 1.68;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  transition: background-color 0.2s ease, color 0.2s ease;
  text-rendering: optimizeLegibility;
}

.site-wrapper {
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ==========================================================================
   Header & Top Navigation
   ========================================================================== */
.site-header {
  padding: 1.25rem 0 1rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.35rem;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-logo:hover {
  opacity: 0.85;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
  position: relative;
  padding: 0.2rem 0;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1.5px;
  background-color: var(--text);
}

/* ==========================================================================
   Main Content Container
   ========================================================================== */
main#content {
  flex: 1;
  width: 100%;
}

/* ==========================================================================
   Typography Defaults
   ========================================================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-sans);
  color: var(--text);
  line-height: 1.25;
  margin-top: 2rem;
  margin-bottom: 0.85rem;
  letter-spacing: -0.015em;
  scroll-margin-top: 2.5rem;
}

h1 {
  font-size: 2.15rem;
  font-weight: 700;
  margin-top: 0;
}

h2 {
  font-size: 1.55rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.4rem;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  margin-bottom: 1.35rem;
}

p.lead {
  font-size: 1.2rem;
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-color: var(--link-border);
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

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

ul,
ol {
  margin-bottom: 1.35rem;
  padding-left: 1.6rem;
}

li {
  margin-bottom: 0.4rem;
}

code,
kbd,
samp {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--code-bg);
  border: 1px solid var(--code-border);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

pre {
  background-color: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 6px;
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.9rem;
  line-height: 1.55;
}

pre code {
  background-color: transparent;
  border: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  color: inherit;
}

math {
  font-family: var(--font-math);
  font-size: 1.05em;
}

blockquote {
  border-left: 3px solid var(--border);
  padding-left: 1.15rem;
  margin: 1.5rem 0;
  color: var(--text-muted);
  font-style: italic;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.55rem 1.1rem;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.15s ease;
  cursor: pointer;
}

.btn-outline {
  background-color: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  background-color: var(--bg-subtle);
  border-color: var(--text-muted);
  text-decoration: none;
}

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background-color: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid var(--border-subtle);
  text-decoration: none;
}

/* ==========================================================================
   Bio & Profile Section
   ========================================================================== */

.bio-header {
  margin-bottom: 1.35rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid var(--border);
}

.bio-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.bio-subtitle {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

.bio-section > p:last-of-type {
  margin-bottom: 0;
}

.bio-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  margin-top: 1.35rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.btn-bio {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: none;
  padding: 0.2rem 0;
  text-decoration: none;
  transition: color 0.15s ease, filter 0.15s ease, transform 0.15s ease;
  line-height: 1.25;
  cursor: pointer;
}

.btn-bio:hover {
  color: var(--text);
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-bio svg {
  color: var(--text-dim);
  transition: color 0.15s ease;
  flex-shrink: 0;
}

.btn-bio:hover svg {
  color: var(--text);
}

.home-projects-section .section-header {
  margin: 1.35rem 0 1.25rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 2.25rem 0 1.25rem;
}

.section-header h2 {
  border-bottom: none;
  padding-bottom: 0;
  margin: 0;
}

.section-more-link {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
}

.section-more-link:hover {
  color: var(--text);
  text-decoration: underline;
}

.project-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

/* ==========================================================================
   Project Cards & Listings
   ========================================================================== */

.project-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.4rem 1.5rem;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--text-muted);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.project-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.project-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
}

.project-card-title a {
  text-decoration: none;
  color: var(--text);
}

.project-card-title a:hover {
  color: var(--accent);
}

.project-card-desc {
  color: var(--text-muted);
  font-size: 0.98rem;
  margin-bottom: 0.85rem;
}

.project-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.75rem;
  margin-top: auto;
}

.post-preview-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.post-preview-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.35rem 1.5rem;
  transition: all 0.15s ease;
}

.post-preview-card:hover {
  border-color: var(--text-muted);
  box-shadow: var(--shadow-sm);
}

.post-preview-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 0.4rem 0;
}

.post-preview-title a {
  text-decoration: none;
  color: var(--text);
}

.post-preview-title a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.post-preview-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.65rem;
}

.post-preview-meta time {
  font-family: var(--font-mono);
}

.post-preview-excerpt {
  color: var(--text-muted);
  font-size: 0.97rem;
  margin-bottom: 0.85rem;
  line-height: 1.55;
}

.post-read-link {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.post-read-link:hover {
  text-decoration: underline;
  gap: 0.5rem;
}

/* ==========================================================================
   Article Tag-Based Research & Filter System
   ========================================================================== */

.article-tag-research {
  margin: 1rem 0 1.5rem;
  padding: 1rem 1.25rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.tag-research-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.tag-search-box {
  position: relative;
  flex: 1;
  min-width: 220px;
  display: flex;
  align-items: center;
}

.tag-search-box .icon-search {
  position: absolute;
  left: 0.85rem;
  color: var(--text-dim);
  pointer-events: none;
}

.tag-search-input {
  width: 100%;
  padding: 0.48rem 2.2rem 0.48rem 2.3rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
  transition: all 0.15s ease;
}

.tag-search-input:focus {
  background-color: var(--bg-surface);
  border-color: var(--text);
  box-shadow: 0 0 0 2px var(--border);
}

.tag-search-input::placeholder {
  color: var(--text-dim);
  font-size: 0.84rem;
}

.tag-search-clear {
  position: absolute;
  right: 0.65rem;
  background: none;
  border: none;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.2rem 0.35rem;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
}

.tag-search-clear:hover {
  color: var(--text);
  background-color: var(--border);
}

.tag-results-counter {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

.tag-pills-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-subtle);
}

.tag-pills-label {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

.tag-pills-scroll {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.65rem;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.15s ease;
  line-height: 1.2;
}

.tag-pill:hover {
  color: var(--text);
  border-color: var(--text-muted);
  background-color: var(--bg);
}

.tag-pill.is-active {
  background-color: var(--text);
  border-color: var(--text);
  color: var(--bg);
}

.tag-pill .tag-pill-count {
  font-size: 0.72rem;
  padding: 0.05rem 0.35rem;
  border-radius: 9999px;
  background-color: var(--border);
  color: var(--text);
  line-height: 1;
}

.tag-pill.is-active .tag-pill-count {
  background-color: rgba(128, 128, 128, 0.25);
  color: var(--bg);
}

/* Clickable card tag badges */
.tag-badge-clickable {
  cursor: pointer;
  transition: all 0.15s ease;
}

.tag-badge-clickable:hover {
  background-color: var(--text);
  color: var(--bg);
  border-color: var(--text);
  transform: translateY(-1px);
}

/* No results state */
.tag-no-results {
  text-align: center;
  padding: 2rem 1rem;
  font-family: var(--font-sans);
  color: var(--text-muted);
}

.tag-no-results p {
  margin-bottom: 0.85rem;
  font-size: 0.95rem;
}

.tag-reset-btn {
  font-size: 0.82rem;
}

.breadcrumb-nav {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-dim);
  opacity: 0.65;
  margin: -0.6rem 0 1.75rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  line-height: 1.3;
  transition: opacity 0.2s ease;
}

.breadcrumb-nav:hover {
  opacity: 0.95;
}

.breadcrumb-nav a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.15s ease;
}

.breadcrumb-nav a:hover {
  color: var(--text-muted);
  text-decoration: underline;
}

.breadcrumb-nav span {
  color: var(--text-dim);
}

.breadcrumb-separator {
  color: var(--text-dim);
  opacity: 0.45;
  font-size: 0.72rem;
  user-select: none;
}

/* ==========================================================================
   Project Presentation Page
   ========================================================================== */

.project-presentation {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2.5rem;
  align-items: start;
  margin-bottom: 2.5rem;
}

.project-header {
  min-width: 0;
}

.project-meta-box {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem;
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.project-meta-item strong {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin-bottom: 0.35rem;
}

.project-meta-item .badge {
  margin-top: 0.2rem;
  margin-right: 0.25rem;
}

.project-downloads-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  align-items: flex-start;
}

article.blogpost {
  margin-top: 1rem;
  padding-bottom: 0;
}

.post-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
  margin-bottom: 2.25rem;
}

.post-header .post-title {
  font-size: 2.3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.post-header .post-subtitle {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  color: var(--text-muted);
  margin: 0.25rem 0 0;
  line-height: 1.4;
}

.post-header-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 1.25rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
}

.post-header-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.post-header-info {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.post-header-info .meta-separator {
  color: var(--text-dim);
}

.post-header-meta .author-byline {
  color: var(--text-muted);
}

.post-header-meta .author-byline strong,
.post-header-meta .author-byline a {
  color: var(--text);
  font-weight: 600;
  text-decoration: underline;
}

.post-header-meta .author-byline a:hover {
  color: var(--accent);
}

.post-header-meta time.post-date {
  color: var(--text-muted);
}

/* ==========================================================================
   Blogpost Header & Article Layout
   ========================================================================== */

/* Tags are indexed from the article header but only shown on preview cards */
.blogpost .post-tags,
.blogpost .post-tags-meta {
  display: none;
}

/* ==========================================================================
   Post Preview Styles
   ========================================================================== */
.post-preview-subtitle {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0.15rem 0 0.5rem;
  line-height: 1.4;
}

.post-preview-tags,
.post-preview-card .post-tags-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.65rem 0 0.5rem;
}

nav[role="doc-toc"] {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.15rem 1.35rem;
  margin: 1.75rem 0 2rem;
  font-family: var(--font-sans);
}

nav[role="doc-toc"] h2 {
  font-size: 1.05rem;
  font-weight: 600;
  border-bottom: none;
  padding-bottom: 0;
  margin: 0 0 0.75rem 0;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-muted);
}

nav[role="doc-toc"] ol {
  padding-left: 0;
  list-style: none;
  margin-bottom: 0;
}

nav[role="doc-toc"] li {
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
}

nav[role="doc-toc"] a {
  color: var(--text);
  text-decoration: none;
}

nav[role="doc-toc"] a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Floating Navigation, Table of Contents & Back to Top (Right Side)
   ========================================================================== */

/* Shared behaviour of the three fixed cards. --float-x is 0 by default and 50% on wide
   screens, where the cards are centred in the gutter right of the article. */
.floating-nav-sidebar,
.floating-toc-sidebar,
.back-to-top-btn {
  --float-x: 0px;
  position: fixed;
  right: 1.25rem;
  width: min(250px, calc(100vw - 2.5rem));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    visibility 0.25s ease;
}

.floating-nav-sidebar {
  top: 2rem;
  z-index: 96;
  transform: translate(var(--float-x), -8px);
}

.floating-toc-sidebar {
  top: 5.1rem;
  z-index: 90;
  max-height: calc(100vh - 9.5rem);
  transform: translate(var(--float-x), 10px);
}

.back-to-top-btn {
  bottom: 2rem;
  z-index: 95;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  transform: translate(var(--float-x), 12px);
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    background-color 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease,
    box-shadow 0.15s ease,
    visibility 0.25s ease;
}

.floating-nav-sidebar.is-visible,
.floating-toc-sidebar.is-visible,
.back-to-top-btn.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(var(--float-x), 0);
}

.back-to-top-btn svg {
  flex-shrink: 0;
  color: var(--text-dim);
  transition: transform 0.15s ease, color 0.15s ease;
}

.back-to-top-btn:hover {
  background-color: var(--bg-subtle);
  color: var(--text);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
  transform: translate(var(--float-x), -2px);
}

.back-to-top-btn:active {
  transform: translate(var(--float-x), 0);
}

.back-to-top-btn:hover svg {
  transform: translateY(-2px);
  color: var(--accent);
}

/* Wide screens: centre the cards between the article's right edge and the viewport
   edge. The midpoint sits at (100vw - --max-w) / 4 from the right; translating by 50%
   of the card width puts the card's centre on it. */
@media (min-width: 1300px) {
  .floating-nav-sidebar,
  .floating-toc-sidebar,
  .back-to-top-btn {
    --float-x: 50%;
    right: calc((100vw - var(--max-w)) / 4);
    width: 250px;
  }
}

.floating-nav-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.85rem;
  gap: 0.5rem;
  font-family: var(--font-sans);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.floating-nav-card:hover {
  border-color: var(--text-dim);
}

.floating-nav-brand {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.floating-nav-brand:hover {
  opacity: 0.85;
}

.floating-nav-divider {
  width: 1px;
  height: 14px;
  background-color: var(--border);
  flex-shrink: 0;
}

.floating-nav-links {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.floating-nav-link {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  position: relative;
  padding: 0.15rem 0;
  transition: color 0.15s ease;
}

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

.floating-nav-link.active {
  color: var(--text);
  font-weight: 600;
}

.floating-nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1.5px;
  background-color: var(--text);
}

.floating-toc-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.floating-toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.85rem;
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  user-select: none;
  font-family: var(--font-sans);
}

.floating-toc-header-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.floating-toc-header-title svg {
  color: var(--text-dim);
  flex-shrink: 0;
}

.floating-toc-manual-toggle {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 0.2rem 0.4rem;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.floating-toc-manual-toggle:hover {
  background-color: var(--bg);
  border-color: var(--border);
  color: var(--text);
}

.floating-toc-body {
  padding: 0.65rem 0.5rem 0.75rem;
  overflow-y: auto;
  max-height: calc(100vh - 12rem);
  scrollbar-width: thin;
}

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

.floating-toc-item {
  margin-bottom: 0.15rem;
}

.floating-toc-link {
  display: block;
  padding: 0.35rem 0.55rem 0.35rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 4px 4px 0;
  transition: all 0.15s ease;
}

.floating-toc-link:hover {
  color: var(--text);
  background-color: var(--bg-subtle);
  border-left-color: var(--text-muted);
  text-decoration: none;
}

.floating-toc-link.is-active {
  color: var(--text);
  font-weight: 600;
  border-left-color: var(--text);
  background-color: var(--bg-subtle);
  text-decoration: none;
}

/* Depth indentation for subheadings */
.floating-toc-item.depth-2 .floating-toc-link {
  padding-left: 1.35rem;
  font-size: 0.78rem;
}

.floating-toc-item.depth-3 .floating-toc-link {
  padding-left: 1.85rem;
  font-size: 0.74rem;
}

/* Collapsed state (minimal compact card) */
.floating-toc-sidebar.is-collapsed .floating-toc-card {
  box-shadow: var(--shadow-sm);
}

.floating-toc-sidebar.is-collapsed .floating-toc-header {
  border-bottom: none;
  cursor: pointer;
}

.floating-toc-sidebar.is-collapsed .floating-toc-header:hover {
  background-color: var(--bg);
}

.floating-toc-sidebar.is-collapsed .floating-toc-body {
  display: none;
}

/* ==========================================================================
   Post Content & Typst Typography
   ========================================================================== */

.post-content {
  font-size: 1.08rem;
  line-height: 1.75;
}

.post-content p {
  text-align: justify;
}

.post-footer-notice {
  margin-top: 3.5rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text-muted);
  text-align: center;
}

.post-footer-notice p {
  margin: 0;
  line-height: 1.55;
}

/* ==========================================================================
   Site Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.25rem 0 3rem;
  margin-top: auto;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text-dim);
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-left {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
}

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

/* ==========================================================================
   Responsive Breakpoints & Media Queries
   ========================================================================== */

@media (max-width: 768px) {
  .project-presentation {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 640px) {
  html {
    font-size: 15px;
  }

  .site-header {
    padding: 1.5rem 0 1rem;
    margin-bottom: 1.75rem;
  }

  .site-nav {
    gap: 1rem;
    font-size: 0.9rem;
  }

  h1 {
    font-size: 1.85rem;
  }

  .post-header .post-title {
    font-size: 1.85rem;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .floating-nav-sidebar {
    top: 1rem;
    right: 1rem;
    width: auto;
    max-width: calc(100vw - 2rem);
  }

  .floating-toc-sidebar {
    top: 4.25rem;
    right: 1rem;
    width: auto;
    max-width: calc(100vw - 2rem);
  }

  .back-to-top-btn {
    bottom: 1.25rem;
    right: 1rem;
    width: auto;
    min-width: 135px;
  }
}