/* Design system: Minimalism & Swiss style · navy academic palette
   Crimson Pro (headings) + Atkinson Hyperlegible (body). */

:root {
  --color-primary: #1E3A5F;
  --color-on-primary: #FFFFFF;
  --color-link: #1D4ED8;
  --color-bg: #F8FAFC;
  --color-fg: #0F172A;
  --color-card: #FFFFFF;
  --color-muted: #E9EEF5;
  --color-muted-fg: #475569;
  --color-border: #CBD5E1;
  --color-ring: #2563EB;
  --color-accent-soft: #DBEAFE;
  --color-accent-soft-fg: #1E3A8A;

  --font-heading: "Crimson Pro", Georgia, "Times New Roman", serif;
  --font-body: "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", sans-serif;

  --space-1: 4px;  --space-2: 8px;  --space-3: 12px; --space-4: 16px;
  --space-6: 24px; --space-8: 32px; --space-12: 48px; --space-16: 64px; --space-24: 96px;

  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 1px 2px rgb(15 23 42 / 0.06), 0 1px 1px rgb(15 23 42 / 0.04);
  --shadow-lg: 0 12px 32px -12px rgb(15 23 42 / 0.25);
  --ease: cubic-bezier(0.2, 0, 0, 1);
  --header-h: 64px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary: #93C5FD;
    --color-on-primary: #0B1220;
    --color-link: #93C5FD;
    --color-bg: #0B1220;
    --color-fg: #E2E8F0;
    --color-card: #111A2B;
    --color-muted: #1A2538;
    --color-muted-fg: #A3B1C6;
    --color-border: #2A3950;
    --color-ring: #93C5FD;
    --color-accent-soft: #172A46;
    --color-accent-soft-fg: #BFDBFE;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 12px 32px -12px rgb(0 0 0 / 0.6);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --color-primary: #93C5FD;
  --color-on-primary: #0B1220;
  --color-link: #93C5FD;
  --color-bg: #0B1220;
  --color-fg: #E2E8F0;
  --color-card: #111A2B;
  --color-muted: #1A2538;
  --color-muted-fg: #A3B1C6;
  --color-border: #2A3950;
  --color-ring: #93C5FD;
  --color-accent-soft: #172A46;
  --color-accent-soft-fg: #BFDBFE;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 12px 32px -12px rgb(0 0 0 / 0.6);
  color-scheme: dark;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + var(--space-4)); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-fg);
  font: 400 1.0625rem/1.65 var(--font-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
h1, h2, h3 { font-family: var(--font-heading); color: var(--color-fg); line-height: 1.15; margin: 0; text-wrap: balance; }
p { margin: 0; }
a { color: var(--color-link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--color-ring); outline-offset: 3px; border-radius: 4px; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.container { width: 100%; max-width: 1040px; margin-inline: auto; padding-inline: var(--space-4); }
@media (min-width: 768px) { .container { padding-inline: var(--space-8); } }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: var(--space-4); top: -100px; z-index: 100; padding: var(--space-2) var(--space-4); background: var(--color-primary); color: var(--color-on-primary); border-radius: var(--radius); }
.skip-link:focus { top: var(--space-2); }
.muted { color: var(--color-muted-fg); }

.icon { width: 20px; height: 20px; flex: none; }
.icon-sm { width: 16px; height: 16px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease);
}
.site-header.scrolled { border-bottom-color: var(--color-border); }
.header-inner { display: flex; align-items: center; gap: var(--space-4); height: var(--header-h); }
.brand { font: 700 1.25rem/1.4 var(--font-heading); color: var(--color-fg); text-decoration: none; margin-right: auto; white-space: nowrap; min-width: 0; overflow: hidden; text-overflow: ellipsis; }
.icon-btn, .lang-switch { flex: none; }
nav { display: flex; align-items: center; }
.nav-links { display: flex; gap: 0; }
@media (min-width: 1200px) { .brand { flex-shrink: 0; } .header-inner { gap: var(--space-3); } }
.nav-links a {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 var(--space-2);
  color: var(--color-muted-fg); text-decoration: none; font-size: 0.95rem; border-radius: var(--radius); white-space: nowrap;
  transition: color 150ms var(--ease), background-color 150ms var(--ease);
}
.nav-links a:hover { color: var(--color-fg); background: var(--color-muted); }
.nav-links a[aria-current="true"] { color: var(--color-fg); font-weight: 700; }

.icon-btn {
  display: inline-grid; place-items: center; width: 44px; height: 44px; padding: 0;
  border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-card);
  color: var(--color-fg); cursor: pointer; transition: background-color 150ms var(--ease);
}
.icon-btn:hover { background: var(--color-muted); }
.icon-sun { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: block; }
  :root:not([data-theme="light"]) .icon-moon { display: none; }
}
.menu-btn { display: none; }
.lang-switch {
  display: inline-grid; place-items: center; min-width: 44px; height: 44px; padding: 0 var(--space-2);
  border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-card);
  color: var(--color-fg); font-weight: 700; font-size: 0.9rem; letter-spacing: 0.04em; text-decoration: none;
  transition: background-color 150ms var(--ease), border-color 150ms var(--ease);
}
.lang-switch:hover { background: var(--color-muted); border-color: var(--color-primary); }

@media (max-width: 1199px) {
  .menu-btn { display: inline-grid; }
  .nav-links {
    position: absolute; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; gap: 0; padding: var(--space-2) var(--space-4) var(--space-4);
    background: var(--color-bg); border-bottom: 1px solid var(--color-border); box-shadow: var(--shadow-lg);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { width: 100%; font-size: 1.05rem; padding: 0 var(--space-3); }
}
@media (max-width: 479px) {
  .header-inner { gap: var(--space-2); }
  .brand { font-size: 1.1rem; }
}

/* ---------- hero ---------- */
.hero {
  display: grid; gap: var(--space-8); align-items: center;
  padding-block: var(--space-12) var(--space-16);
}
@media (min-width: 768px) {
  .hero { grid-template-columns: 280px 1fr; gap: var(--space-12); padding-block: var(--space-16) var(--space-24); }
}
.portrait {
  position: relative; width: min(240px, 70vw); aspect-ratio: 4 / 5;
  border-radius: var(--radius-lg); overflow: hidden;
  background: linear-gradient(145deg, var(--color-primary), #2563EB);
  box-shadow: var(--shadow-lg);
}
@media (min-width: 768px) { .portrait { width: 100%; } }
.portrait img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.portrait-fallback {
  position: absolute; inset: 0; display: grid; place-items: center;
  font: 600 4rem/1 var(--font-heading); color: #FFFFFF; letter-spacing: 0.04em;
}
:root[data-theme="dark"] .portrait-fallback { color: #0B1220; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .portrait-fallback { color: #0B1220; } }

.eyebrow { font-size: 0.85rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-muted-fg); margin-bottom: var(--space-3); }
.hero h1 { font-size: clamp(2.4rem, 6vw, 3.75rem); font-weight: 600; letter-spacing: -0.01em; }
.lead { margin-top: var(--space-4); font-size: 1.2rem; max-width: 60ch; }
.affiliation { display: flex; gap: var(--space-2); align-items: flex-start; margin-top: var(--space-4); color: var(--color-muted-fg); }
.affiliation .icon { margin-top: 3px; }

.profile-links { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-6); }
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2); min-height: 44px; padding: 0 var(--space-4);
  border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-card);
  color: var(--color-fg); font-weight: 700; font-size: 0.95rem; text-decoration: none; cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 150ms var(--ease), border-color 150ms var(--ease), background-color 150ms var(--ease);
}
.btn:hover { border-color: var(--color-primary); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn .icon { width: 18px; height: 18px; }
.btn-primary { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-on-primary); }
.btn-primary:hover { background: color-mix(in srgb, var(--color-primary) 88%, #000); }

.stats { display: flex; flex-wrap: wrap; gap: var(--space-3); margin: var(--space-8) 0 0; }
.stats:empty { display: none; }
.stat {
  display: flex; flex-direction: column-reverse; min-width: 112px; padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-card);
}
.stat dd { margin: 0; font: 600 1.9rem/1.1 var(--font-heading); font-variant-numeric: tabular-nums; }
.stat dt { font-size: 0.85rem; color: var(--color-muted-fg); }

/* ---------- sections ---------- */
.section { padding-block: var(--space-12); border-top: 1px solid var(--color-border); }
@media (min-width: 768px) { .section { padding-block: var(--space-16); } }
.section h2 { font-size: clamp(1.9rem, 4vw, 2.4rem); font-weight: 600; margin-bottom: var(--space-6); }
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: var(--space-2) var(--space-6); margin-bottom: var(--space-6); }
.section-head h2 { margin-bottom: 0; }
.subhead { font-size: 1.35rem; font-weight: 600; margin: var(--space-8) 0 var(--space-4); }
.prose { display: grid; gap: var(--space-4); max-width: 70ch; }
.inline-link { display: inline-flex; align-items: center; gap: var(--space-1); font-weight: 700; }

.chips { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.chips li {
  padding: var(--space-1) var(--space-3); border-radius: 999px; font-size: 0.9rem;
  background: var(--color-accent-soft); color: var(--color-accent-soft-fg);
}

.card { padding: var(--space-6); border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-card); box-shadow: var(--shadow); }
.card h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: var(--space-4); }

/* ---------- news ---------- */
.news-list { display: grid; gap: 0; max-width: 820px; }
.news-item { display: grid; gap: var(--space-1) var(--space-6); padding-block: var(--space-4); border-bottom: 1px solid var(--color-muted); }
.news-item:last-child { border-bottom: 0; }
@media (min-width: 640px) { .news-item { grid-template-columns: 96px 1fr; } }
.news-item time { font-weight: 700; color: var(--color-muted-fg); font-variant-numeric: tabular-nums; white-space: nowrap; }
.news-tag {
  display: inline-block; margin-right: var(--space-2); padding: 0 var(--space-2); border-radius: 6px;
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.03em; text-transform: uppercase; vertical-align: 2px;
  background: var(--color-primary); color: var(--color-on-primary);
}
.more { margin-top: var(--space-4); }
.more summary { display: inline-flex; align-items: center; min-height: 44px; cursor: pointer; font-weight: 700; color: var(--color-link); }

/* ---------- publications ---------- */
.pub-year { font-size: 1.25rem; font-weight: 600; color: var(--color-muted-fg); margin: var(--space-6) 0 var(--space-3); }
.pub-year:first-of-type { margin-top: 0; }
.pub-list { display: grid; gap: var(--space-3); }
.pub {
  padding: var(--space-4) var(--space-6); border: 1px solid var(--color-border); border-left: 3px solid var(--color-primary);
  border-radius: var(--radius); background: var(--color-card); box-shadow: var(--shadow);
  transition: box-shadow 200ms var(--ease), transform 200ms var(--ease);
}
.pub:hover { box-shadow: var(--shadow-lg); transform: translateY(-1px); }
.pub-title { font: 600 1.25rem/1.3 var(--font-heading); color: var(--color-fg); text-decoration: none; }
.pub-title:hover { color: var(--color-link); text-decoration: underline; }
.pub-authors { margin-top: var(--space-2); color: var(--color-muted-fg); font-size: 0.95rem; }
.pub-authors strong { color: var(--color-fg); }
.pub-venue { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2) var(--space-3); margin-top: var(--space-1); font-size: 0.95rem; }
.badge { padding: 0 var(--space-2); border-radius: 6px; font-size: 0.8rem; font-weight: 700; background: var(--color-muted); color: var(--color-muted-fg); }

/* ---------- timeline ---------- */
.timeline { position: relative; display: grid; gap: var(--space-8); padding-left: var(--space-6); border-left: 2px solid var(--color-border); max-width: 820px; }
.entry { position: relative; }
.entry::before {
  content: ""; position: absolute; left: calc(-1 * var(--space-6) - 7px); top: 6px;
  width: 12px; height: 12px; border-radius: 50%; background: var(--color-bg); border: 2px solid var(--color-primary);
}
.entry-meta { font-size: 0.9rem; font-weight: 700; color: var(--color-muted-fg); }
.entry h3 { font-size: 1.35rem; font-weight: 600; margin-top: var(--space-1); }
.entry-org { color: var(--color-muted-fg); margin-bottom: var(--space-2); }

/* ---------- skills & contact ---------- */
.skill-grid { display: grid; gap: var(--space-4); }
@media (min-width: 640px) { .skill-grid { grid-template-columns: repeat(2, 1fr); } }
.contact { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-4); }
.contact .btn { overflow-wrap: anywhere; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--color-border); padding-block: var(--space-8); font-size: 0.9rem; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-2) var(--space-6); }

/* ---------- reveal motion (JS adds .reveal only when motion is allowed) ---------- */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity 350ms var(--ease), transform 350ms var(--ease); }
.reveal.in { opacity: 1; transform: none; }

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

@media print {
  .site-header, .skip-link, .theme-btn, .more summary { display: none !important; }
  .section { border: 0; padding-block: var(--space-6); break-inside: avoid; }
  .pub, .card { box-shadow: none; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- education ---------- */
.edu-list { display: grid; gap: var(--space-4); max-width: 820px; }
.edu { display: flex; gap: var(--space-6); align-items: center; }
.edu-logos { display: flex; justify-content: center; gap: var(--space-2); flex: none; min-width: 152px; }
.logo-tile {
  --tile: 72px;
  display: grid; place-items: center; width: var(--tile); height: var(--tile);
  border-radius: var(--radius); border: 1px solid var(--color-border);
  background: #FFFFFF; /* logos are designed for light backgrounds, keep tiles white in dark mode too */
}
.logo-tile img { width: calc(var(--tile) - 18px); height: calc(var(--tile) - 18px); object-fit: contain; }
.edu-body h3 { font-size: 1.3rem; font-weight: 600; margin: var(--space-1) 0 var(--space-1); }
.edu-body .entry-org { margin-bottom: 0; }
@media (max-width: 559px) {
  .edu { flex-direction: column; align-items: flex-start; gap: var(--space-4); }
  .edu-logos { min-width: 0; }
  .logo-tile { --tile: 60px; }
}