/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  --ink:        #13151A;
  --paper:      #FBFAF7;
  --paper-dim:  #F2F0EA;
  --accent:     #2D5BFF;
  --accent-dim: #DCE4FF;
  --muted:      #6B6F76;
  --rule:       #E4E2DC;

  --font-display: "Fraunces", Georgia, serif;
  --font-body:    "IBM Plex Sans", -apple-system, sans-serif;
  --font-mono:    "IBM Plex Mono", "SF Mono", monospace;

  --sidebar-w: 230px;
  --maxw: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--ink); text-decoration: none; }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

img { max-width: 100%; display: block; }

/* ============================================================
   LAYOUT SHELL
   ============================================================ */
.shell {
  display: flex;
  min-height: 100vh;
}

/* ---- Sidebar (desktop) ---- */
.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-w);
  padding: 40px 28px;
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  z-index: 50;
  background: var(--paper);
}

.sidebar-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 2px;
}

.sidebar-role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 28px;
}

.sidebar-divider {
  width: 28px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 28px;
  border: none;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.sidebar-nav a {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  padding: 7px 0;
  color: var(--muted);
  display: flex;
  align-items: baseline;
  gap: 10px;
  transition: color 0.15s ease;
}

.sidebar-nav a .idx {
  font-size: 0.74rem;
  color: var(--rule);
  width: 16px;
}

.sidebar-nav a:hover { color: var(--ink); }
.sidebar-nav a:hover .idx { color: var(--accent); }

.sidebar-nav a.active { color: var(--ink); }
.sidebar-nav a.active .idx { color: var(--accent); }

.sidebar-foot {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.sidebar-foot a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  border-bottom: 1px solid transparent;
}

.sidebar-foot a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---- Mobile top bar ---- */
.topbar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  padding: 16px 20px;
  align-items: center;
  justify-content: space-between;
}

.topbar-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
}

.topbar-toggle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: none;
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 6px 10px;
  color: var(--ink);
  cursor: pointer;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  padding: 8px 20px 16px;
}

.mobile-nav.open { display: flex; }

.mobile-nav a {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
}

.mobile-nav a:last-child { border-bottom: none; }

/* ---- Main content ---- */
.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  padding: 64px 48px 96px;
  max-width: calc(var(--maxw) + 96px);
}

.content {
  max-width: var(--maxw);
}

@media (max-width: 880px) {
  .sidebar { display: none; }
  .topbar { display: flex; }
  .main { margin-left: 0; padding: 36px 24px 72px; }
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
}

h1 { font-size: 2.1rem; }
h2 { font-size: 1.5rem; margin-top: 2.4em; }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1.1em; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 10px;
}

.lede {
  font-size: 1.08rem;
  color: var(--ink);
}

.muted { color: var(--muted); }

.mono { font-family: var(--font-mono); }

/* ============================================================
   STATUS LINE (signature element)
   ============================================================ */
.status-line {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--muted);
  margin: 18px 0 36px;
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
}

.status-line .prompt { color: var(--accent); }

.cursor {
  display: inline-block;
  width: 7px;
  height: 1em;
  background: var(--accent);
  margin-left: 4px;
  vertical-align: text-bottom;
  animation: blink 1.1s steps(2, jump-none) infinite;
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* ============================================================
   HOME PAGE
   ============================================================ */
.hero {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  margin-bottom: 8px;
}

.hero-photo {
  width: 124px;
  height: 124px;
  border-radius: 6px;
  object-fit: cover;
  border: 1px solid var(--rule);
  flex-shrink: 0;
}

.hero-text { flex: 1; min-width: 0; }

@media (max-width: 540px) {
  .hero { flex-direction: column; }
  .hero-photo { width: 96px; height: 96px; }
}

.section-divider {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 3em 0 2.2em;
}

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

.news-item {
  display: flex;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}

.news-item:first-child { padding-top: 0; }

.news-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
  padding-top: 0.2em;
  width: 84px;
  flex-shrink: 0;
}

.news-body { flex: 1; }

/* ============================================================
   PUBLICATIONS
   ============================================================ */
.pub-filter {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 2em;
}

.pub-filter button {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  background: none;
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 6px 12px;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.pub-filter button:hover { border-color: var(--accent); color: var(--ink); }

.pub-filter button.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

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

.pub-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
}

.pub-item:first-child { padding-top: 0; }

.pub-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted);
  padding-top: 0.15em;
}

.pub-title {
  font-weight: 600;
  font-size: 1rem;
  margin: 0 0 4px;
  line-height: 1.4;
}

.pub-authors {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0 0 6px;
}

.pub-authors .me { color: var(--ink); font-weight: 600; }

.pub-venue {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  margin: 0 0 10px;
}

.pub-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.pub-links a {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--muted);
  border-bottom: 1px solid var(--rule);
}

.pub-links a:hover { color: var(--accent); border-bottom-color: var(--accent); }

@media (max-width: 540px) {
  .pub-item { grid-template-columns: 1fr; gap: 4px; }
}

/* ============================================================
   PROJECTS
   ============================================================ */
.project-row {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 36px;
  padding: 40px 0;
  border-bottom: 1px solid var(--rule);
  align-items: center;
}

.project-row:first-of-type { padding-top: 0; }

.project-row.flip .project-thumb { order: 2; }
.project-row.flip .project-text { order: 1; }

.project-thumb img {
  border-radius: 6px;
  border: 1px solid var(--rule);
  aspect-ratio: 4/3;
  object-fit: cover;
  width: 100%;
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 8px;
}

.project-text h3 { margin-bottom: 8px; }

.project-text p { color: var(--muted); font-size: 0.95rem; }

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  margin-top: 6px;
}

.project-link:hover { color: var(--accent); border-color: var(--accent); }

@media (max-width: 700px) {
  .project-row, .project-row.flip {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 28px 0;
  }
  .project-row.flip .project-thumb,
  .project-row.flip .project-text { order: initial; }
}

/* ============================================================
   PRESENTATIONS
   ============================================================ */
.talk-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.talk-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
}

.talk-item:first-child { padding-top: 0; }

.talk-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.talk-kind {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 2px 7px;
  border-radius: 3px;
  margin-bottom: 6px;
}

.talk-title { font-weight: 600; margin: 0 0 4px; }
.talk-venue { font-size: 0.9rem; color: var(--muted); margin: 0 0 8px; }

@media (max-width: 540px) {
  .talk-item { grid-template-columns: 1fr; gap: 4px; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.page-footer {
  margin-top: 4em;
  padding-top: 1.6em;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted);
}