:root {
  /* Surfaces */
  --bg:        oklch(0.985 0.003 60);
  --ink:       oklch(0.205 0.010 60);
  --ink-soft:  oklch(0.38 0.008 60);
  --ink-mute:  oklch(0.55 0.006 60);
  --rule:      oklch(0.90 0.006 60);
  --rule-soft: oklch(0.94 0.005 60);

  /* Sidebar — "pure" palette (matches main bg) */
  --sidebar-bg:   #fcfbf9;
  --sidebar-fg:   #1a1916;
  --sidebar-mute: #74716c;
  --sidebar-rule: #e6e3dd;

  /* Accent — muted oxblood */
  --accent:        #8a4a52;
  --accent-soft:   color-mix(in oklab, var(--accent) 16%, transparent);
  --accent-strong: color-mix(in oklab, var(--accent) 88%, black);

  --sidebar-w: 280px;
  --sidebar-pad: 44px;
  --content-max: 760px;
  --content-pad-x: 80px;

  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color .15s ease;
}
a:hover {
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.app { display: flex; height: 100vh; overflow: hidden; }

/* ───────── Sidebar ───────── */
.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  background: var(--sidebar-bg);
  color: var(--sidebar-fg);
  height: 100vh;
  position: relative;
  overflow-y: auto;
  border-right: 1px solid var(--sidebar-rule);
}
.sidebar-inner {
  padding: var(--sidebar-pad) 32px;
  display: flex;
  flex-direction: column;
  min-height: 100%;
  gap: 36px;
}

.ident .name {
  font-family: var(--font-body);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--sidebar-fg);
  margin: 0 0 14px;
}
.ident .title-line {
  font-size: 13px;
  font-weight: 500;
  color: var(--sidebar-fg);
  letter-spacing: 0.005em;
  margin-bottom: 3px;
}
.ident .affiliation {
  font-size: 12.5px;
  color: var(--sidebar-mute);
  font-style: italic;
  letter-spacing: 0.005em;
}

.icon-row {
  display: flex;
  gap: 4px;
  margin-top: -8px;
}
.icon-row a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  color: var(--sidebar-mute);
  transition: background .15s ease, color .15s ease;
}
.icon-row a:hover {
  background: color-mix(in oklab, var(--sidebar-fg) 10%, transparent);
  color: var(--sidebar-fg);
  text-decoration: none;
}

.vnav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: 12px;
  border-top: 1px solid var(--sidebar-rule);
}
.vnav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 0;
  font-size: 13px;
  color: var(--sidebar-mute);
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color .15s ease;
  cursor: pointer;
}
.vnav-link:hover {
  color: var(--sidebar-fg);
  text-decoration: none;
}
.vnav-link.is-active { color: var(--sidebar-fg); }
.vnav-link.is-active .vnav-dot {
  background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 18%, transparent);
}
.vnav-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--sidebar-rule);
  transition: background .2s ease, box-shadow .2s ease;
  flex: 0 0 auto;
}
.vnav-link svg { margin-left: auto; opacity: .55; }

.sidebar-foot {
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--sidebar-rule);
  font-size: 11px;
  color: var(--sidebar-mute);
  letter-spacing: 0.01em;
}

/* ───────── Main scrolling column ───────── */
.main-scroll {
  flex: 1 1 auto;
  height: 100vh;
  overflow-y: auto;
  scroll-behavior: smooth;
}
.main-inner {
  max-width: calc(var(--content-max) + var(--content-pad-x) * 2);
  padding: 88px var(--content-pad-x) 96px;
  margin: 0;
}

.section {
  margin-bottom: 88px;
  scroll-margin-top: 32px;
}
.section:last-of-type { margin-bottom: 32px; }

.section-head {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin: 0 0 36px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}
.subhead {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.005em;
  color: var(--ink);
  margin: 56px 0 24px;
  display: flex;
  align-items: center;
  gap: 14px;
  line-height: 1.2;
}
.subhead::before {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--accent);
  flex: 0 0 auto;
}
.section > .subhead:first-of-type { margin-top: 0; }

/* ───────── Reveal-on-scroll animation ───────── */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .7s cubic-bezier(.2,.7,.2,1),
              transform .7s cubic-bezier(.2,.7,.2,1);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ───────── About ───────── */
.about-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 36px;
  align-items: start;
}
.photo-wrap { position: relative; }
.photo-placeholder {
  width: 100%;
  aspect-ratio: 4 / 5;
  border-radius: 4px;
  background: oklch(0.94 0.005 60);
  border: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.photo-placeholder img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.ph-stripes {
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    135deg,
    transparent 0 8px,
    oklch(0.91 0.005 60) 8px 9px
  );
}
.ph-label {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  background: oklch(0.985 0.003 60 / 0.85);
  padding: 4px 10px;
  border-radius: 2px;
}
.about-text p {
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  margin: 0 0 18px;
  text-wrap: pretty;
}
.about-text p:last-child { margin-bottom: 0; }
.about-text strong { font-weight: 600; }
.about-text em { font-style: italic; }

/* ───────── Paper blocks ───────── */
.paper-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.paper { padding: 0; }
.paper-title {
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 6px;
  letter-spacing: -0.005em;
  color: var(--ink);
}
.paper-title a { color: var(--ink); }
.paper-title a:hover {
  color: var(--accent);
  text-decoration: none;
}
.paper-meta {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 4px;
  line-height: 1.5;
}
.coauthors a { color: var(--accent); }
.paper-journal {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 10px;
  line-height: 1.5;
}
.paper-journal em strong {
  font-style: italic;
  font-weight: 700;
  color: var(--ink);
}
.paper-year { font-style: normal; }

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  padding: 3px 9px 3px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-soft);
  background: transparent;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
  letter-spacing: 0.01em;
}
.pill:hover {
  background: var(--accent-soft);
  border-color: color-mix(in oklab, var(--accent) 40%, var(--rule));
  color: var(--accent-strong);
  text-decoration: none;
}
.pill svg { opacity: .5; }

.paper-extras {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 8px 0 4px;
  line-height: 1.55;
}
.extra-row .dash {
  color: var(--ink-mute);
  margin-right: 2px;
}

.abstract-wrap { margin-top: 12px; }
.abstract-toggle {
  appearance: none;
  background: transparent;
  border: 0;
  padding: 0;
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color .15s ease;
}
.abstract-toggle:hover { color: var(--accent); }
.abstract-toggle svg { transition: transform .18s ease; }
.abstract-toggle[aria-expanded="true"] svg { transform: rotate(90deg); }
.abstract-body {
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-soft);
  margin-top: 10px;
  padding: 14px 16px 14px 18px;
  background: oklch(0.97 0.004 60);
  border-left: 2px solid var(--accent);
  border-radius: 2px;
  text-wrap: pretty;
}
.abstract-body[hidden] { display: none; }

.paper-wip .paper-title { font-weight: 600; }
.paper-wip .paper-meta { margin-bottom: 0; }

/* ───────── Teaching ───────── */
.teach-group { margin-bottom: 32px; }
.teach-group:last-child { margin-bottom: 0; }
.teach-table {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule-soft);
}
.teach-row {
  display: grid;
  grid-template-columns: minmax(260px, 1.4fr) minmax(0, 1fr);
  gap: 24px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule-soft);
}
.teach-row dt, .teach-row dd { margin: 0; }
.teach-course {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}
.teach-name {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.45;
}
.teach-tag {
  flex: 0 0 auto;
  display: inline-block;
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  border: 1px solid var(--rule);
  padding: 1px 5px;
  border-radius: 2px;
  line-height: 1.5;
  transform: translateY(-1px);
}
.teach-tag--grad {
  color: var(--accent);
  border-color: color-mix(in oklab, var(--accent) 35%, var(--rule));
  background: var(--accent-soft);
}
.teach-terms {
  font-size: 12.5px;
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
  text-align: right;
  line-height: 1.55;
  text-wrap: pretty;
}

/* ───────── Contact ───────── */
.contact-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.contact-block .label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 8px;
}
.contact-email a {
  font-size: 16px;
  font-weight: 500;
}
.addr-lines {
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* ───────── Page foot ───────── */
.page-foot {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  font-size: 12px;
  color: var(--ink-mute);
  letter-spacing: 0.02em;
}

/* ───────── Scrollbar styling ───────── */
.main-scroll::-webkit-scrollbar,
.sidebar::-webkit-scrollbar { width: 10px; }
.main-scroll::-webkit-scrollbar-thumb,
.sidebar::-webkit-scrollbar-thumb {
  background: oklch(0.85 0.005 60);
  border-radius: 999px;
  border: 3px solid transparent;
  background-clip: padding-box;
}

/* ───────── Responsive ───────── */
@media (max-width: 900px) {
  .app { flex-direction: column; height: auto; overflow: visible; }
  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--sidebar-rule);
  }
  .sidebar-inner { padding: 28px 24px; gap: 24px; }
  .vnav { flex-direction: row; flex-wrap: wrap; gap: 18px; padding-top: 16px; }
  .vnav-link { padding: 4px 0; }
  .main-scroll { height: auto; overflow: visible; }
  .main-inner { padding: 48px 28px 64px; }
  .about-grid { grid-template-columns: 140px 1fr; gap: 24px; }
  .contact-block { grid-template-columns: 1fr; gap: 24px; }
  .teach-row { grid-template-columns: 1fr; gap: 4px; }
  .teach-terms { text-align: left; white-space: normal; max-width: none; }
}