@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400;1,600&family=Lora:ital,wght@0,400;0,600;1,400&family=DM+Mono:wght@400;500&display=swap');

/* ─── Variables ──────────────────────────────────────── */
:root {
  --bg:          #090908;
  --bg-2:        #111110;
  --text:        #e4dcc8;
  --text-mid:    #a89e8e;
  --text-dim:    #6b6458;
  --accent:      #b5f03b;
  --accent-warm: #e8c87a;
  --border:      #1e1d18;
  --sidebar-w:   252px;
  --ease:        cubic-bezier(0.16, 1, 0.3, 1);
  --t:           0.32s;
}

/* ─── Light theme ────────────────────────────────────── */
html[data-theme="light"] {
  --bg:          #f4ede0;
  --bg-2:        #ebe3d2;
  --text:        #1a1812;
  --text-mid:    #49423a;
  --text-dim:    #8c8070;
  --accent:      #4a7200;
  --accent-warm: #8c5c00;
  --border:      #d4cab8;
}
html[data-theme="light"] body::after { opacity: 0.02; }

/* ─── Theme transition ───────────────────────────────── */
html { transition: background 0.3s, color 0.3s; }
body, .sidebar, .content { transition: background var(--t), color var(--t); }

/* ─── Reset ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Lora', Georgia, serif;
  font-size: 1.125rem;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Grain overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.72' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ─── Progress bar ───────────────────────────────────── */
.progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  background: var(--accent);
  z-index: 1000;
  transition: width 0.08s linear;
  pointer-events: none;
}

/* ─── Layout ─────────────────────────────────────────── */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ─── Sidebar ────────────────────────────────────────── */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 2.5rem 2rem;
  border-right: 1px solid var(--border);
  background: var(--bg);
  z-index: 100;
  overflow-y: auto;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 3.5rem;
}

.site-mark {
  display: block;
  text-decoration: none;
}
.site-name {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text);
  display: block;
  line-height: 1.15;
}
.site-sub {
  font-family: 'DM Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  display: block;
  margin-top: 0.3rem;
}

.mob-toggle { display: none; }

.sidebar-body {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Nav links */
.nav-links { list-style: none; }
.nav-links > li { margin-bottom: 0.1rem; }

.nav-links > li > a {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.38rem 0;
  font-family: 'DM Mono', monospace;
  font-size: 0.67rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--t) var(--ease);
}
.nav-links > li > a::before {
  content: '';
  display: block;
  width: 1.1rem;
  height: 1px;
  background: currentColor;
  flex-shrink: 0;
  transition: width var(--t) var(--ease);
}
.nav-links > li > a:hover       { color: var(--text-mid); }
.nav-links > li > a.active      { color: var(--accent); }
.nav-links > li > a.active::before { width: 1.8rem; }

/* Sub-nav */
.sub-nav {
  list-style: none;
  padding-left: 2.1rem;
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.4s var(--ease);
}
.has-sub.expanded .sub-nav { max-height: 200px; }

.sub-nav li a {
  display: block;
  padding: 0.26rem 0;
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--t);
}
.sub-nav li a:hover  { color: var(--text-mid); }
.sub-nav li a.active { color: var(--accent-warm); }

/* Sidebar footer */
.sidebar-foot {
  border-top: 1px solid var(--border);
  padding-top: 1.75rem;
  margin-top: 2rem;
}
.socials {
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
  margin-bottom: 0.85rem;
}
.socials a {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--t);
}
.socials a:hover { color: var(--accent); }

.copy {
  font-family: 'DM Mono', monospace;
  font-size: 0.57rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  opacity: 0.45;
}

/* ─── Content area ───────────────────────────────────── */
.content {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
  animation: pageIn 0.55s var(--ease) both;
}

@keyframes pageIn {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Home: Hero ─────────────────────────────────────── */
.hero {
  padding: 5rem 5rem 4.5rem;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: 'EJ';
  position: absolute;
  bottom: -2rem;
  right: 3rem;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 14rem;
  font-weight: 400;
  letter-spacing: -0.06em;
  color: var(--text);
  opacity: 0.025;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.hero-eyebrow {
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.75rem;
}

.hero-name {
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 400;
  font-size: clamp(3rem, 7.5vw, 7.5rem);
  line-height: 0.96;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 3rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.hero-first {
  align-self: flex-start;
}
.hero-last {
  margin-left: 0.62em;
  color: var(--accent);
}

.hero-footer {
  display: flex;
  align-items: flex-start;
  gap: 2.5rem;
  flex-wrap: wrap;
}
.hero-tagline {
  font-family: 'Lora', serif;
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text-mid);
  max-width: 40ch;
  line-height: 1.55;
  margin-bottom: 0;
}
.badge {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.35rem 0.75rem;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ─── Home: Grid ─────────────────────────────────────── */
.index-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.index-card {
  display: block;
  text-decoration: none;
  padding: 3rem 4.5rem 3.5rem;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: background var(--t);
}
.index-card:nth-child(2n) { border-right: none; }
.index-card:hover { background: var(--bg-2); }

.card-no {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  margin-bottom: 1.75rem;
}
.card-h {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 2.5rem;
  font-weight: 500;
  line-height: 1.05;
  color: var(--text);
  margin-bottom: 0.7rem;
  transition: color var(--t);
}
.index-card:hover .card-h { color: var(--accent); }

.card-p {
  font-family: 'Lora', serif;
  font-size: 0.95rem;
  color: var(--text-dim);
  line-height: 1.55;
  max-width: 28ch;
  margin-bottom: 0;
}
.card-go {
  position: absolute;
  bottom: 2.5rem;
  right: 3.5rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  opacity: 0;
  transform: translateX(-6px);
  transition: all var(--t) var(--ease);
}
.index-card:hover .card-go { opacity: 1; transform: translateX(0); }

/* ─── Inner page header ──────────────────────────────── */
.pg-header {
  padding: 5rem 5rem 4rem;
  border-bottom: 1px solid var(--border);
}
.pg-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}
.pg-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: clamp(2.5rem, 5vw, 5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--text);
}
.pg-sub {
  font-family: 'Lora', serif;
  font-size: 1.05rem;
  font-style: italic;
  color: var(--text-mid);
  margin-top: 1.25rem;
  max-width: 50ch;
  line-height: 1.55;
}

/* ─── Page body ──────────────────────────────────────── */
.pg-body { padding: 4rem 5rem; }

.sec-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mid);
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  margin-top: 3.5rem;
}
.sec-label:first-child { margin-top: 0; }
.sec-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

h2 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 2rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 1rem;
}
h3 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.4rem;
}
p {
  color: var(--text-mid);
  margin-bottom: 1.5rem;
  max-width: 62ch;
}

.placeholder-block {
  border: 1px dashed var(--border);
  padding: 1.5rem 2rem;
  margin-bottom: 1.5rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  line-height: 1.9;
}

/* ─── About ──────────────────────────────────────────── */
.about-cols {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 5rem;
  margin-bottom: 4rem;
}
.kv-list {
  list-style: none;
  border-top: 1px solid var(--border);
}
.kv-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--border);
  gap: 1rem;
}
.kv-key {
  font-family: 'DM Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  flex-shrink: 0;
}
.kv-val {
  font-family: 'Lora', serif;
  font-size: 0.9rem;
  color: var(--text-mid);
  text-align: right;
}

/* ─── Item list (papers, projects, education) ────────── */
.item-list { border-top: 1px solid var(--border); }

.item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: start;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--border);
}
.item-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.25rem;
  line-height: 1.3;
}
.item-authors {
  font-family: 'Lora', serif;
  font-size: 0.875rem;
  font-style: italic;
  color: var(--text-dim);
  margin-bottom: 0.2rem;
}
.item-venue {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}
.item-year {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  white-space: nowrap;
  padding-top: 0.3rem;
}
.item-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.6rem;
}
.item-link {
  font-family: 'DM Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t);
}
.item-link:hover { border-bottom-color: var(--accent); }

/* BibTeX toggle button (shares .item-link look) */
button.bib-toggle {
  background: none;
  border: none;
  border-bottom: 1px solid transparent;
  cursor: pointer;
  padding: 0;
  transition: border-color var(--t);
}
button.bib-toggle:hover    { border-bottom-color: var(--accent); }
button.bib-toggle.open     { color: var(--accent-warm); border-bottom-color: var(--accent-warm); }

/* BibTeX collapsible block */
.bib-block {
  display: none;
  margin-top: 0.9rem;
}
.bib-block.open { display: block; }
.bib-block pre {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  line-height: 1.6;
  color: var(--text-mid);
  white-space: pre;
}

/* ─── Research tabs ──────────────────────────────────── */
.tab-bar {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
}
.tab-btn {
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.9rem 1.5rem 0.9rem 0;
  cursor: pointer;
  margin-bottom: -1px;
  transition: all var(--t);
}
.tab-btn:hover  { color: var(--text-mid); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

.tab-panel         { display: none; }
.tab-panel.active  { display: block; }

/* ─── Writing list ───────────────────────────────────── */
.posts { border-top: 1px solid var(--border); }

.post-row {
  display: grid;
  grid-template-columns: 6.5rem 1fr auto;
  gap: 2rem;
  align-items: baseline;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: all var(--t);
}
.post-row:hover .post-title { color: var(--accent); }

.post-date {
  font-family: 'DM Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}
.post-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.15rem;
  color: var(--text);
  line-height: 1.3;
  transition: color var(--t);
}
.post-tag {
  font-family: 'DM Mono', monospace;
  font-size: 0.57rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 0.2rem 0.5rem;
  white-space: nowrap;
}

/* ─── Contact ────────────────────────────────────────── */
.contact-intro { max-width: 52ch; margin-bottom: 3.5rem; }
.contact-list  { border-top: 1px solid var(--border); }

.contact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: all var(--t) var(--ease);
}
.contact-row:hover { padding-left: 0.75rem; }
.contact-row:hover .c-name  { color: var(--accent); }
.contact-row:hover .c-arrow { color: var(--accent); transform: translateX(4px); }

.c-left  { display: flex; align-items: baseline; gap: 1.5rem; }
.c-name  {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--text);
  line-height: 1;
  transition: color var(--t);
}
.c-handle {
  font-family: 'DM Mono', monospace;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}
.c-arrow {
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  color: var(--text-dim);
  transition: all var(--t) var(--ease);
}

/* ─── Theme toggle button ────────────────────────────── */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  width: 100%;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'DM Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  transition: color var(--t), border-color var(--t);
  margin-bottom: 0.85rem;
  text-align: left;
}
.theme-toggle:hover {
  color: var(--text);
  border-color: var(--text-dim);
}
.theme-toggle .t-icon {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid currentColor;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}
/* Half-filled circle: dark = right half filled, light = left half filled */
.theme-toggle .t-icon::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 50%;
  height: 100%;
  background: currentColor;
}
html[data-theme="light"] .theme-toggle .t-icon::after {
  right: auto; left: 0;
}

/* ─── Mobile ─────────────────────────────────────────── */
@media (max-width: 820px) {
  .sidebar {
    position: relative;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 1.25rem 1.5rem;
    flex-direction: column;
  }
  .sidebar-header { margin-bottom: 0; }
  .mob-toggle {
    display: block;
    background: none;
    border: 1px solid var(--border);
    color: var(--text-dim);
    font-family: 'DM Mono', monospace;
    font-size: 0.58rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.35rem 0.7rem;
    cursor: pointer;
    transition: all var(--t);
  }
  .mob-toggle:hover { color: var(--text); border-color: var(--text-dim); }

  .sidebar-body { display: none; padding-top: 1.5rem; }
  .sidebar-body.open { display: flex; }

  .content { margin-left: 0; }

  .hero { padding: 2.5rem 1.5rem 2rem; }
  .hero::before { display: none; }
  .hero-name { font-size: 3.8rem; }

  .index-grid { grid-template-columns: 1fr; }
  .index-card { border-right: none; padding: 2rem 1.5rem; }
  .index-card:nth-child(2n) { border-right: none; }

  .pg-header { padding: 2.5rem 1.5rem 2rem; }
  .pg-body   { padding: 2rem 1.5rem; }

  .about-cols { grid-template-columns: 1fr; gap: 2.5rem; }

  .post-row { grid-template-columns: 5rem 1fr; }
  .post-tag { display: none; }

  .c-name { font-size: 1.25rem; }
}

/* ─── Blog two-panel layout ──────────────────────────── */
.blog-layout {
  display: flex;
  align-items: flex-start;
  min-height: 100vh;
}

.blog-list {
  position: sticky;
  top: 0;
  width: 280px;
  height: 100vh;
  overflow: hidden;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}
.blog-list-header {
  padding: 2.5rem 2rem 1.25rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.blog-list-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 0.4rem;
  margin-bottom: 0;
  line-height: 1.2;
}
.blog-post-list {
  overflow-y: auto;
  flex: 1;
}
.blog-post-item {
  display: block;
  padding: 1rem 2rem;
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: background var(--t);
}
.blog-post-item:hover { background: var(--bg-2); }
.blog-post-item.active {
  background: var(--bg-2);
  border-left: 2px solid var(--accent);
  padding-left: calc(2rem - 2px);
}
.bpi-date {
  display: block;
  font-family: 'DM Mono', monospace;
  font-size: 0.57rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 0.3rem;
}
.bpi-title {
  display: block;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 0.3rem;
  transition: color var(--t);
}
.blog-post-item:hover .bpi-title,
.blog-post-item.active .bpi-title { color: var(--accent); }
.bpi-tag {
  display: inline-block;
  font-family: 'DM Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 0.15rem 0.4rem;
}

/* Blog content panel */
.blog-content {
  flex: 1;
  min-width: 0;
  min-height: 100vh;
  padding: 4rem 5rem;
}
.blog-welcome, .blog-loading {
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 3rem 0;
}
.blog-welcome {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 60vh;
}

/* Article */
.blog-article-header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}
.blog-article-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--text);
  margin-top: 0.75rem;
  margin-bottom: 0;
}

/* Markdown body typography */
.blog-article-body { max-width: 68ch; }
.blog-article-body h1 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.75rem; font-weight: 600;
  color: var(--text); line-height: 1.2;
  margin: 2.5rem 0 1rem;
}
.blog-article-body h2 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.35rem; font-weight: 600;
  color: var(--text); line-height: 1.2;
  margin: 2rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}
.blog-article-body h3 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.1rem; font-weight: 600;
  color: var(--text); margin: 1.75rem 0 0.5rem;
}
.blog-article-body p {
  font-family: 'Lora', Georgia, serif;
  font-size: 1.05rem; line-height: 1.78;
  color: var(--text-mid); margin-bottom: 1.5rem; max-width: none;
}
.blog-article-body a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color var(--t); }
.blog-article-body a:hover { border-bottom-color: var(--accent); }
.blog-article-body ul, .blog-article-body ol { padding-left: 1.5rem; margin-bottom: 1.5rem; color: var(--text-mid); }
.blog-article-body li { font-family: 'Lora', Georgia, serif; font-size: 1.05rem; line-height: 1.75; margin-bottom: 0.4rem; }
.blog-article-body code { font-family: 'DM Mono', monospace; font-size: 0.82em; background: var(--bg-2); color: var(--accent); padding: 0.15em 0.4em; border-radius: 2px; }
.blog-article-body pre { background: var(--bg-2); border: 1px solid var(--border); padding: 1.5rem; overflow-x: auto; margin: 1.5rem 0; }
.blog-article-body pre code { background: none; padding: 0; color: var(--text-mid); font-size: 0.85rem; }
.blog-article-body blockquote { border-left: 3px solid var(--accent); padding-left: 1.5rem; margin: 1.5rem 0; font-style: italic; }
.blog-article-body blockquote p { color: var(--text-dim); }
.blog-article-body hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }
.blog-article-body table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-family: 'DM Mono', monospace; font-size: 0.82rem; }
.blog-article-body th { text-align: left; padding: 0.6rem 1rem; border-bottom: 1px solid var(--border); color: var(--text); font-weight: 500; }
.blog-article-body td { padding: 0.6rem 1rem; border-bottom: 1px solid var(--border); color: var(--text-mid); }

/* Mobile */
@media (max-width: 820px) {
  .blog-layout { flex-direction: column; }
  .blog-list { position: relative; width: 100%; height: auto; max-height: 45vh; border-right: none; border-bottom: 1px solid var(--border); }
  .blog-content { padding: 2rem 1.5rem; }
}

/* ─── Blog list collapse ─────────────────────────────── */
.blog-list {
  transition: width 0.35s var(--ease), min-width 0.35s var(--ease);
}
.blog-layout.list-hidden .blog-list {
  width: 0;
  min-width: 0;
  overflow: hidden;
  border-right: none;
}

.blog-list-header {
  display: flex;
  flex-direction: column;
}
.blog-list-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}
.list-toggle-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.55rem;
  cursor: pointer;
  flex-shrink: 0;
  transition: color var(--t), border-color var(--t);
  line-height: 1;
}
.list-toggle-btn:hover { color: var(--text); border-color: var(--text-dim); }

/* Tab button — visible only when list is hidden */
.list-expand-tab {
  display: none;
  position: sticky;
  top: 2.5rem;
  align-self: flex-start;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  background: none;
  border: 1px solid var(--border);
  border-left: none;
  color: var(--text-dim);
  font-family: 'DM Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.75rem 0.35rem;
  cursor: pointer;
  transition: color var(--t), border-color var(--t);
  margin-right: 2rem;
  flex-shrink: 0;
}
.list-expand-tab:hover { color: var(--text); border-color: var(--text-dim); }
.blog-layout.list-hidden .list-expand-tab { display: block; }

/* ─── Sidebar collapse ───────────────────────────────── */
.sidebar {
  transition: width 0.35s var(--ease), padding 0.35s var(--ease), border-color 0.35s;
}
.content {
  transition: margin-left 0.35s var(--ease);
}
.layout.sidebar-collapsed .sidebar {
  width: 0;
  padding: 0;
  overflow: hidden;
  border-right-color: transparent;
}
.layout.sidebar-collapsed .content {
  margin-left: 0;
}

.sidebar-header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}
.sidebar-collapse-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.85rem;
  width: 26px;
  height: 26px;
  cursor: pointer;
  flex-shrink: 0;
  line-height: 1;
  transition: color var(--t), border-color var(--t);
}
.sidebar-collapse-btn:hover { color: var(--text); border-color: var(--text-dim); }

/* Fixed expand tab — injected by JS */
.sidebar-expand-tab {
  position: fixed;
  left: 0;
  top: 50vh;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: none;
  color: var(--text-dim);
  font-family: 'DM Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.75rem 0.35rem;
  cursor: pointer;
  z-index: 200;
  transition: color var(--t), background var(--t);
}
.sidebar-expand-tab:hover { color: var(--text); background: var(--bg-2); }

/* Hide collapse button on mobile — mob-toggle handles it there */
@media (max-width: 820px) {
  .sidebar-collapse-btn { display: none; }
  .layout.sidebar-collapsed .sidebar { width: 100%; padding: 1.25rem 1.5rem; overflow: visible; border-right-color: transparent; }
  .layout.sidebar-collapsed .content { margin-left: 0; }
  .sidebar-expand-tab { display: none !important; }
}

/* ─── Mobile improvements ────────────────────────────── */
@media (max-width: 820px) {
  /* Base */
  body { font-size: 1rem; }

  /* Hero */
  .hero { padding: 2rem 1.25rem 1.75rem; }
  .hero-name { font-size: clamp(2.8rem, 12vw, 4rem); margin-bottom: 1.75rem; }
  .hero-footer { flex-direction: column; gap: 1rem; }
  .badge { align-self: flex-start; }

  /* Page header / body */
  .pg-header { padding: 2rem 1.25rem 1.75rem; }
  .pg-body   { padding: 1.75rem 1.25rem; }
  .pg-title  { font-size: clamp(2rem, 8vw, 3rem); }

  /* Index grid */
  .index-grid { grid-template-columns: 1fr; }
  .index-card { border-right: none; padding: 1.75rem 1.25rem; }
  .card-h { font-size: 2rem; }

  /* About */
  .about-cols { grid-template-columns: 1fr; gap: 2rem; }

  /* Research tabs */
  .tab-bar { gap: 0; }
  .tab-btn { padding: 0.8rem 1.25rem 0.8rem 0; font-size: 0.6rem; }

  /* Writing posts */
  .post-row { grid-template-columns: 5rem 1fr; gap: 1rem; }
  .post-tag  { display: none; }

  /* Contact */
  .c-name { font-size: 1.2rem; }
  .contact-row { padding: 1.25rem 0; }

  /* Touch targets */
  .nav-links > li > a { padding: 0.6rem 0; }
  .mob-toggle { min-height: 36px; }
}

@media (max-width: 480px) {
  .hero-name { font-size: clamp(2.4rem, 14vw, 3rem); }
  .index-card { padding: 1.5rem 1rem; }
  .pg-header { padding: 1.75rem 1rem 1.5rem; }
  .pg-body   { padding: 1.5rem 1rem; }
  .blog-content { padding: 1.75rem 1rem; }
  .blog-list-header { padding: 1.5rem 1rem 1rem; }
  .blog-post-item { padding: 0.85rem 1rem; }
}