/* ============================================================
   UNIFIED STYLESHEET — weihang-huang.github.io
   ============================================================
   Shared tokens, reset, and components for all pages.
   Page-specific sections are labelled at the end.
   ============================================================ */

/* ----------------------------------------------------------
   DESIGN TOKENS
   ---------------------------------------------------------- */
:root, [data-theme="light"] {
  /* Surfaces */
  --color-bg:             #f7f6f2;
  --color-surface:        #f9f8f5;
  --color-surface-2:      #fbfbf9;
  --color-surface-offset: #f3f0ec;
  --color-surface-offset-2: #edeae5;
  --color-surface-dynamic: #e6e4df;
  --color-divider:        #dcd9d5;
  --color-border:         #d4d1ca;

  /* Text */
  --color-text:           #28251d;
  --color-text-muted:     #7a7974;
  --color-text-faint:     #bab9b4;
  --color-text-inverse:   #f9f8f4;

  /* Primary Accent */
  --color-primary:        #01696f;
  --color-primary-hover:  #0c4e54;
  --color-primary-active: #0f3638;
  --color-primary-highlight: #cedcd8;

  /* Shadows */
  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);

  /* Radius */
  --radius-sm:   0.375rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1rem;
  --radius-full: 9999px;

  /* Motion */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Typography */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body:    'Work Sans', 'Helvetica Neue', sans-serif;
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Content widths */
  --content-narrow:  640px;
  --content-default: 960px;
  --content-wide:    1200px;
}

[data-theme="dark"] {
  --color-bg:             #171614;
  --color-surface:        #1c1b19;
  --color-surface-2:      #201f1d;
  --color-surface-offset: #1d1c1a;
  --color-surface-offset-2: #22211f;
  --color-surface-dynamic: #2d2c2a;
  --color-divider:        #262523;
  --color-border:         #393836;
  --color-text:           #cdccca;
  --color-text-muted:     #797876;
  --color-text-faint:     #5a5957;
  --color-text-inverse:   #2b2a28;
  --color-primary:        #4f98a3;
  --color-primary-hover:  #227f8b;
  --color-primary-active: #1a626b;
  --color-primary-highlight: #313b3b;
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:#171614;--color-surface:#1c1b19;--color-text:#cdccca;
    --color-text-muted:#797876;--color-text-faint:#5a5957;--color-text-inverse:#2b2a28;
    --color-primary:#4f98a3;--color-primary-hover:#227f8b;--color-primary-highlight:#313b3b;
    --color-divider:#262523;--color-border:#393836;--color-surface-offset:#1d1c1a;
    --color-surface-dynamic:#2d2c2a;
  }
}

/* ----------------------------------------------------------
   RESET & BASE
   ---------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 250ms ease, color 250ms ease;
}

img, picture, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }

::selection {
  background: oklch(from var(--color-primary) l c h / 0.2);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

a, button, [role="button"] {
  transition:
    color var(--transition-interactive),
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive),
    opacity var(--transition-interactive);
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0;
}

.container {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* ----------------------------------------------------------
   NAV
   ---------------------------------------------------------- */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: var(--space-4);
}
.nav-logo {
  display: flex; align-items: center; gap: var(--space-3);
  text-decoration: none; color: var(--color-text);
}
.nav-logo-name {
  font-family: var(--font-display); font-size: var(--text-lg);
  font-weight: 400; letter-spacing: -.02em; line-height: 1.1;
}
.nav-links {
  display: flex; align-items: center; gap: var(--space-8); list-style: none;
}
.nav-links a {
  font-size: var(--text-sm); font-weight: 500;
  color: var(--color-text-muted); text-decoration: none; letter-spacing: .01em;
}
.nav-links a:hover { color: var(--color-primary); }
.nav-links a.active { color: var(--color-text); }
.nav-actions { display: flex; align-items: center; gap: var(--space-3); }
.theme-toggle {
  background: none; border: none; cursor: pointer;
  color: var(--color-text-muted); padding: var(--space-2);
  border-radius: var(--radius-md); display: flex; align-items: center;
  min-width: 44px; min-height: 44px; justify-content: center;
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-offset); }
.nav-hamburger {
  display: none; background: none; border: none; cursor: pointer;
  color: var(--color-text); padding: var(--space-2);
  min-width: 44px; min-height: 44px; align-items: center;
  justify-content: center; border-radius: var(--radius-md);
}

@media (max-width: 768px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    display: none; flex-direction: column; gap: 0;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-4) var(--space-6);
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: var(--space-3) 0; font-size: var(--text-base); }
}

/* ----------------------------------------------------------
   BUTTONS (shared)
   ---------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: 600;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md); text-decoration: none;
  cursor: pointer; border: none; letter-spacing: .01em;
  min-height: 44px;
}
.btn-primary { background: var(--color-primary); color: var(--color-text-inverse); }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-primary:active { background: var(--color-primary-active); }
.btn-outline {
  background: transparent; color: var(--color-text);
  border: 1px solid oklch(from var(--color-text) l c h / 0.2);
}
.btn-outline:hover {
  background: var(--color-surface-offset);
  border-color: oklch(from var(--color-text) l c h / 0.35);
}

/* ----------------------------------------------------------
   SHARED SECTION HEADINGS
   ---------------------------------------------------------- */
.section-label {
  font-size: var(--text-xs); font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase;
  color: var(--color-primary); margin-bottom: var(--space-3);
}
.section-title {
  font-family: var(--font-display); font-size: var(--text-2xl);
  font-weight: 400; color: var(--color-text);
  letter-spacing: -.02em; line-height: 1.1;
  margin-bottom: var(--space-4);
}
.section-lead {
  font-size: var(--text-base); color: var(--color-text-muted);
  max-width: 60ch; line-height: 1.7; margin-bottom: var(--space-10);
}
.divider { height: 1px; background: var(--color-divider); }

/* ----------------------------------------------------------
   PAGE HEADER (sub-pages)
   ---------------------------------------------------------- */
.page-header {
  background: var(--color-surface);
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
  border-bottom: 1px solid var(--color-divider);
}
.page-label {
  font-size: var(--text-xs); font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase;
  color: var(--color-primary); margin-bottom: var(--space-3);
}
.page-title {
  font-family: var(--font-display); font-size: var(--text-2xl);
  font-weight: 400; color: var(--color-text);
  letter-spacing: -.02em; line-height: 1.1;
  margin-bottom: var(--space-4);
}
.page-lead {
  font-size: var(--text-base); color: var(--color-text-muted);
  max-width: 55ch; line-height: 1.7;
}

/* ----------------------------------------------------------
   CONTACT STRIP (shared across home, publications)
   ---------------------------------------------------------- */
.contact-section {
  background: color-mix(in oklch, var(--color-primary) 8%, var(--color-surface));
  border-top: 1px solid var(--color-divider);
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}
.contact-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: var(--space-6);
}
.contact-text h2 {
  font-family: var(--font-display); font-size: var(--text-xl);
  font-weight: 400; color: var(--color-text); margin-bottom: var(--space-2);
}
.contact-text p {
  font-size: var(--text-base); color: var(--color-text-muted); max-width: 50ch;
}
.contact-links {
  display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center;
}
.contact-link {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: 500;
  color: var(--color-text-muted); text-decoration: none;
  padding: var(--space-2) var(--space-4);
  border: 1px solid oklch(from var(--color-text) l c h / 0.15);
  border-radius: var(--radius-md); background: var(--color-surface);
  min-height: 44px;
}
.contact-link:hover {
  color: var(--color-primary); border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}
.contact-email-btn {
  background: var(--color-primary); color: var(--color-text-inverse);
  border-color: var(--color-primary); font-weight: 600;
}
.contact-email-btn:hover {
  background: var(--color-primary-hover); border-color: var(--color-primary-hover);
  color: var(--color-text-inverse);
}

/* ----------------------------------------------------------
   FOOTER
   ---------------------------------------------------------- */
footer {
  background: var(--color-surface-offset);
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-8);
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: var(--space-4);
}
.footer-copy { font-size: var(--text-xs); color: var(--color-text-faint); }
.footer-links { display: flex; gap: var(--space-5); }
.footer-links a { font-size: var(--text-xs); color: var(--color-text-faint); text-decoration: none; }
.footer-links a:hover { color: var(--color-text-muted); }


/* ============================================================
   PAGE: HOME (index.html)
   ============================================================ */

/* Sections */
section { padding-block: clamp(var(--space-12), 8vw, var(--space-24)); }

/* Hero */
.hero {
  position: relative; overflow: hidden;
  padding-block: clamp(var(--space-20), 12vw, var(--space-24));
  background-color: var(--color-surface);
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  object-fit: cover; width: 100%; height: 100%;
  opacity: .18; filter: saturate(.5);
}
[data-theme="dark"] .hero-bg { opacity: .07; }
.hero-content {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr auto;
  gap: var(--space-12); align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--color-primary); background: var(--color-primary-highlight);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full); margin-bottom: var(--space-6);
}
.hero-name {
  font-family: var(--font-display); font-size: var(--text-3xl);
  font-weight: 400; color: var(--color-text);
  line-height: 1.05; letter-spacing: -.02em; margin-bottom: var(--space-5);
}
.hero-name em { font-style: italic; color: var(--color-primary); }
.hero-tagline {
  font-size: var(--text-lg); color: var(--color-text-muted);
  line-height: 1.55; margin-bottom: var(--space-8); max-width: 52ch;
}
.hero-meta {
  display: flex; flex-wrap: wrap;
  gap: var(--space-4) var(--space-6); margin-bottom: var(--space-8);
}
.hero-meta-item {
  display: flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-sm); color: var(--color-text-muted);
}
.hero-meta-item svg { color: var(--color-primary); flex-shrink: 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.hero-stats-card {
  background: var(--color-surface-2);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-xl); padding: var(--space-6);
  box-shadow: var(--shadow-md); min-width: 200px;
  text-align: center; flex-shrink: 0;
}
.stats-grid {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-4) var(--space-6);
}
.stat-item { display: flex; flex-direction: column; align-items: center; gap: var(--space-1); }
.stat-value {
  font-family: var(--font-display); font-size: var(--text-xl);
  font-weight: 400; color: var(--color-text); letter-spacing: -.02em;
}
.stat-label {
  font-size: var(--text-xs); color: var(--color-text-muted);
  text-align: center; line-height: 1.3;
}
.stats-divider { height: 1px; background: var(--color-divider); margin: var(--space-4) 0; }

@media (max-width: 768px) {
  .hero-content { grid-template-columns: 1fr; }
  .hero-stats-card { display: none; }
}

/* News */
.news-section { background: var(--color-bg); }
.news-list { display: flex; flex-direction: column; gap: 0; }
.news-item {
  display: flex; gap: var(--space-6); align-items: flex-start;
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-divider);
}
.news-item:last-child { border-bottom: none; }
.news-date {
  font-size: var(--text-xs); color: var(--color-text-faint);
  min-width: 5.5rem; padding-top: .2em; font-variant-numeric: tabular-nums;
}
.news-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--color-primary); flex-shrink: 0; margin-top: .5em;
}
.news-text { font-size: var(--text-sm); color: var(--color-text); max-width: none; }
.news-text strong { color: var(--color-text); font-weight: 600; }

/* Interests */
.interests-section { background: var(--color-surface); }
.interests-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: var(--space-4);
}
.interest-card {
  background: var(--color-surface-2);
  border: 1px solid oklch(from var(--color-text) l c h / 0.07);
  border-radius: var(--radius-lg); padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}
.interest-card:hover { box-shadow: var(--shadow-md); }
.interest-icon {
  width: 40px; height: 40px; margin-bottom: var(--space-4);
  color: var(--color-primary); background: var(--color-primary-highlight);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
}
.interest-title {
  font-size: var(--text-base); font-weight: 600;
  color: var(--color-text); margin-bottom: var(--space-2); line-height: 1.3;
}
.interest-desc {
  font-size: var(--text-sm); color: var(--color-text-muted);
  line-height: 1.6; max-width: none;
}

/* Selected pubs on home */
.pubs-section { background: var(--color-bg); }
.pub-list { display: flex; flex-direction: column; gap: 0; }
.pub-item {
  display: grid; grid-template-columns: auto 1fr; gap: var(--space-5);
  align-items: start; padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-divider);
}
.pub-item:last-child { border-bottom: none; }
.pub-year {
  font-size: var(--text-xs); font-weight: 600; color: var(--color-primary);
  letter-spacing: .06em; min-width: 3.5rem; padding-top: .15em;
}
.pub-title {
  font-family: var(--font-display); font-size: var(--text-base);
  color: var(--color-text); line-height: 1.4; margin-bottom: var(--space-1);
  font-weight: 400; max-width: none;
}
.pub-authors {
  font-size: var(--text-xs); color: var(--color-text-muted);
  margin-bottom: var(--space-2); max-width: none;
}
.pub-venue {
  display: inline-flex; align-items: center;
  font-size: var(--text-xs); color: var(--color-text-muted);
  background: var(--color-surface-offset);
  padding: 2px var(--space-2); border-radius: var(--radius-full);
}
.pub-cites {
  display: inline-flex; align-items: center; gap: var(--space-1);
  font-size: var(--text-xs); color: var(--color-text-faint);
  margin-left: var(--space-3);
}
.pub-links { display: flex; gap: var(--space-3); margin-top: var(--space-2); }
.pub-link {
  font-size: var(--text-xs); font-weight: 600; color: var(--color-primary);
  text-decoration: none; display: flex; align-items: center; gap: 4px;
}
.pub-link:hover { color: var(--color-primary-hover); text-decoration: underline; }

/* Background */
.background-section { background: var(--color-surface); }
.bg-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-12); }
@media (max-width: 768px) { .bg-grid { grid-template-columns: 1fr; gap: var(--space-10); } }
.bg-col-title {
  font-family: var(--font-display); font-size: var(--text-lg);
  color: var(--color-text); margin-bottom: var(--space-6);
  font-weight: 400; letter-spacing: -.01em;
}
.timeline { display: flex; flex-direction: column; gap: 0; }
.timeline-item {
  display: flex; gap: var(--space-4); align-items: flex-start;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-divider);
}
.timeline-item:last-child { border-bottom: none; }
.timeline-dot {
  width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0;
  background: var(--color-primary-highlight);
  border: 2px solid var(--color-primary); margin-top: .35em;
}
.timeline-title { font-size: var(--text-sm); font-weight: 600; color: var(--color-text); margin-bottom: 2px; }
.timeline-place { font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: 2px; }
.timeline-period { font-size: var(--text-xs); color: var(--color-text-faint); }

/* Skills */
.skills-section { background: var(--color-bg); }
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(240px, 100%), 1fr));
  gap: var(--space-6);
}
.skill-group-title {
  font-size: var(--text-xs); font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--color-text-muted); margin-bottom: var(--space-3);
}
.skill-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.skill-tag {
  font-size: var(--text-xs); font-weight: 500;
  background: var(--color-surface); color: var(--color-text);
  border: 1px solid oklch(from var(--color-text) l c h / 0.1);
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-full);
}


/* ============================================================
   PAGE: PUBLICATIONS (publications.html)
   ============================================================ */

/* Page header inner (pub-specific layout) */
.page-header-inner {
  display: flex; align-items: flex-end; justify-content: space-between;
  flex-wrap: wrap; gap: var(--space-6);
}

/* Scholar badge */
.scholar-badge {
  display: inline-flex; align-items: center; gap: var(--space-5);
  background: var(--color-surface-2);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg); padding: var(--space-3) var(--space-5);
  box-shadow: var(--shadow-sm);
}
.scholar-stat { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.scholar-val {
  font-family: var(--font-display); font-size: var(--text-lg);
  color: var(--color-text); letter-spacing: -.02em; line-height: 1;
}
.scholar-lbl {
  font-size: var(--text-xs); color: var(--color-text-muted);
  letter-spacing: .04em; text-transform: uppercase;
}
.scholar-sep { width: 1px; height: 28px; background: var(--color-divider); }

/* Section count chip */
.section-count {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 600; color: var(--color-text-muted);
  background: var(--color-surface-offset);
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-full);
  margin-left: var(--space-3);
}

/* Filter bar */
.filter-bar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  padding-block: var(--space-4);
  position: sticky; top: 60px; z-index: 50;
}
.filter-inner {
  display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap;
}
.filter-label {
  font-size: var(--text-xs); font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--color-text-muted); margin-right: var(--space-2);
}
.filter-btn {
  font-size: var(--text-xs); font-weight: 500;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full); border: 1px solid var(--color-border);
  background: transparent; color: var(--color-text-muted);
  cursor: pointer; white-space: nowrap;
}
.filter-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.filter-btn.active {
  background: var(--color-primary); color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

/* Year sections */
.year-section { padding-block: var(--space-8); }
.year-heading {
  font-family: var(--font-display); font-size: var(--text-xl);
  font-weight: 400; color: var(--color-text);
  letter-spacing: -.02em; margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-primary-highlight);
}

/* Pub card (full publications page) */
.pub-card {
  display: grid; grid-template-columns: auto 1fr; gap: var(--space-5);
  align-items: start; padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-divider);
}
.pub-card:last-child { border-bottom: none; }

.pub-type-icon {
  width: 36px; height: 36px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.pub-type-icon.journal { background: var(--color-primary-highlight); color: var(--color-primary); }
.pub-type-icon.preprint { background: var(--color-surface-offset); color: var(--color-text-muted); }
.pub-type-icon.workshop { background: oklch(from var(--color-primary) .92 .03 h); color: var(--color-primary-hover); }
.pub-type-icon.proceedings { background: var(--color-surface-dynamic); color: var(--color-text-muted); }

.pub-type-label {
  font-size: var(--text-xs); font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--color-text-faint); margin-top: var(--space-1);
}
.pub-type-badge {
  display: inline-flex; align-items: center;
  font-size: var(--text-xs); font-weight: 500;
  padding: 2px var(--space-2); border-radius: var(--radius-full);
  margin-right: var(--space-2); letter-spacing: .04em;
}
.pub-body {}
.pub-meta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.pub-status {
  font-size: var(--text-xs); font-weight: 500;
  color: var(--color-text-faint); font-style: italic;
}
.pub-authors strong { color: var(--color-text); }

@media (max-width: 600px) {
  .pub-card { grid-template-columns: 1fr; gap: var(--space-3); }
  .pub-type-icon { display: none; }
}

/* Empty state */
.empty-state {
  display: flex; flex-direction: column; align-items: center;
  text-align: center; padding: var(--space-16) var(--space-8);
  color: var(--color-text-muted);
}
.empty-state p {
  font-size: var(--text-sm); color: var(--color-text-muted); max-width: 36ch;
}

/* Contact strip (pub page variant) */
.contact-strip {
  background: color-mix(in oklch, var(--color-primary) 8%, var(--color-surface));
  border-top: 1px solid var(--color-divider);
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}
.contact-link.primary {
  background: var(--color-primary); color: var(--color-text-inverse);
  border-color: var(--color-primary); font-weight: 600;
}
.contact-link.primary:hover {
  background: var(--color-primary-hover); border-color: var(--color-primary-hover);
  color: var(--color-text-inverse);
}


/* ============================================================
   PAGE: TALKS (talks.html)
   ============================================================ */

/* Stats bar */
.stats-bar {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-divider);
  padding-block: var(--space-5);
}
.stats-row { display: flex; gap: var(--space-8); flex-wrap: wrap; }
.stat-chip { display: flex; flex-direction: column; gap: 2px; }
.stat-chip-value {
  font-family: var(--font-display); font-size: var(--text-xl);
  color: var(--color-text); letter-spacing: -.02em; line-height: 1;
}
.stat-chip-label {
  font-size: var(--text-xs); color: var(--color-text-muted);
  letter-spacing: .04em; text-transform: uppercase;
}

/* Talks list */
.talks-main { padding-block: clamp(var(--space-10), 6vw, var(--space-20)); }
.year-group { margin-bottom: var(--space-12); }
.year-group:last-child { margin-bottom: 0; }
.year-group .year-heading {
  display: flex; align-items: center; gap: var(--space-4);
  margin-bottom: var(--space-6); border-bottom: none; padding-bottom: 0;
}
.year-heading-text {
  font-family: var(--font-display); font-size: var(--text-xl);
  font-weight: 400; color: var(--color-text); letter-spacing: -.02em;
}
.year-heading-line { flex: 1; height: 1px; background: var(--color-divider); }

/* Talk card */
.talk-card {
  display: grid; grid-template-columns: auto 1fr; gap: var(--space-5);
  align-items: start; padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-divider);
}
.talk-card:last-child { border-bottom: none; }
.talk-type-badge {
  display: inline-flex; align-items: center; gap: var(--space-1);
  font-size: var(--text-xs); font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase;
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-full);
  white-space: nowrap; min-width: 7.5rem; justify-content: center;
}
.badge-conf { background: var(--color-primary-highlight); color: var(--color-primary); }
.badge-workshop {
  background: color-mix(in oklch, var(--color-primary) 12%, var(--color-surface-offset));
  color: var(--color-primary);
}
.badge-invited { background: oklch(from var(--color-primary) 0.95 0.03 h); color: var(--color-primary-hover); }
[data-theme="dark"] .badge-invited { background: oklch(from var(--color-primary) 0.25 0.05 h); color: var(--color-primary); }

.talk-title {
  font-family: var(--font-display); font-size: var(--text-base);
  color: var(--color-text); line-height: 1.4; margin-bottom: var(--space-2);
  font-weight: 400; max-width: none; font-style: italic;
}
.talk-venue {
  font-size: var(--text-sm); color: var(--color-text-muted);
  margin-bottom: var(--space-1); max-width: none;
}
.talk-venue strong { color: var(--color-text); font-weight: 600; }
.talk-meta {
  display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-5);
  margin-top: var(--space-2);
}
.talk-meta-item {
  display: inline-flex; align-items: center; gap: var(--space-1);
  font-size: var(--text-xs); color: var(--color-text-faint);
}
.talk-meta-item svg { flex-shrink: 0; }
.talk-links { display: flex; gap: var(--space-4); margin-top: var(--space-3); }
.talk-link {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: var(--text-xs); font-weight: 600;
  color: var(--color-primary); text-decoration: none;
}
.talk-link:hover { color: var(--color-primary-hover); text-decoration: underline; }

@media (max-width: 640px) {
  .talk-card { grid-template-columns: 1fr; gap: var(--space-3); }
  .talk-type-badge { width: fit-content; }
}

/* Upcoming section */
.upcoming-section {
  background: var(--color-surface);
  padding-block: clamp(var(--space-10), 5vw, var(--space-16));
  border-top: 1px solid var(--color-divider);
}
.upcoming-empty {
  display: flex; flex-direction: column; align-items: flex-start;
  gap: var(--space-2); padding: var(--space-8);
  background: var(--color-surface-offset); border-radius: var(--radius-lg);
  border: 1px dashed var(--color-border);
}
.upcoming-empty p {
  font-size: var(--text-sm); color: var(--color-text-muted); max-width: 50ch;
}


/* ============================================================
   PAGE: CONTACT (contact.html)
   ============================================================ */
.contact-main {
  padding-block: clamp(var(--space-10), 6vw, var(--space-20));
  background: var(--color-bg);
}
.contact-grid {
  display: grid; grid-template-columns: minmax(0, 2.2fr) minmax(0, 1.4fr);
  gap: var(--space-12); align-items: flex-start;
}
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; gap: var(--space-10); } }

.card {
  background: var(--color-surface-2); border-radius: var(--radius-xl);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  box-shadow: var(--shadow-md); padding: var(--space-8);
}
.card-title {
  font-family: var(--font-display); font-size: var(--text-lg);
  font-weight: 400; color: var(--color-text);
  letter-spacing: -.01em; margin-bottom: var(--space-3);
}
.card-subtitle {
  font-size: var(--text-sm); color: var(--color-text-muted);
  margin-bottom: var(--space-6); max-width: 50ch;
}
.field-label {
  font-size: var(--text-xs); font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--color-text-muted); margin-bottom: var(--space-1);
}
.field-value {
  font-size: var(--text-base); color: var(--color-text);
  margin-bottom: var(--space-4);
}
.field-value a { color: var(--color-primary); text-decoration: none; }
.field-value a:hover { color: var(--color-primary-hover); text-decoration: underline; }
.meta-note {
  font-size: var(--text-xs); color: var(--color-text-faint);
  margin-top: var(--space-2);
}
.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(220px, 100%), 1fr));
  gap: var(--space-4);
}
.link-pill {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-3); padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid oklch(from var(--color-text) l c h / 0.1);
  background: var(--color-surface); text-decoration: none;
}
.link-pill-main { font-size: var(--text-sm); font-weight: 500; color: var(--color-text); }
.link-pill-sub { font-size: var(--text-xs); color: var(--color-text-faint); }
.link-pill:hover {
  border-color: var(--color-primary); box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}
.link-pill-icon {
  display: flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border-radius: var(--radius-full);
  background: var(--color-primary-highlight); color: var(--color-primary);
  flex-shrink: 0;
}
.link-pill-icon svg { width: 14px; height: 14px; }
.note-box {
  margin-top: var(--space-6); padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg); background: var(--color-surface-offset);
  border: 1px dashed var(--color-border);
  font-size: var(--text-xs); color: var(--color-text-muted);
}