/* ============================================================
   AISI Lab — Artificial Intelligence & Systems Immunology
   Master Stylesheet  v2.0
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── CSS Variables (dark theme defaults) ────────────────────── */
:root {
  --color-bg:            #080c12;
  --color-bg-card:       #0f1520;
  --color-bg-card-hover: #141d2e;
  --color-surface:       #0d1219;
  --color-border:        rgba(201,168,76,0.13);
  --color-border-glow:   rgba(201,168,76,0.32);
  --color-shadow:        rgba(0,0,0,0.45);

  --color-gold:          #c9a84c;
  --color-gold-light:    #e2c78a;
  --color-gold-dim:      rgba(201,168,76,0.14);
  --color-teal:          #5fb8b0;
  --color-teal-dim:      rgba(95,184,176,0.12);
  --color-rose:          #d4707a;

  --color-text:          #eae6dd;
  --color-text-muted:    #8a8a90;
  --color-text-dim:      #4e4e56;

  --font-display:  'Cormorant Garamond', Georgia, serif;
  --font-body:     'DM Sans', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', monospace;

  --nav-h:         72px;
  --radius:        12px;
  --radius-sm:     7px;
  --radius-lg:     20px;
  --transition:    .32s cubic-bezier(.4,0,.2,1);

  /* semantic */
  --card-bg: var(--color-bg-card);
  --card-border: var(--color-border);
}

/* ── Light theme overrides ──────────────────────────────────── */
html[data-theme="light"] {
  --color-bg:            #f5f3ee;
  --color-bg-card:       #ffffff;
  --color-bg-card-hover: #f9f7f2;
  --color-surface:       #ede9e0;
  --color-border:        rgba(17,24,33,0.10);
  --color-border-glow:   rgba(201,168,76,0.30);
  --color-shadow:        rgba(10,14,20,0.08);

  --color-gold-dim:      rgba(201,168,76,0.10);
  --color-teal-dim:      rgba(95,184,176,0.10);

  --color-text:          #111821;
  --color-text-muted:    #5a5a62;
  --color-text-dim:      rgba(17,24,33,0.45);
}

/* ── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

a {
  color: var(--color-gold-light);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: #fff; }
html[data-theme="light"] a:hover { color: var(--color-gold); }

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

h1, h2, h3, h4, h5, h6 { line-height: 1.2; color: var(--color-text); }

/* ── Atmospheric grain overlay ──────────────────────────────── */
body::after {
  content: '';
  position: fixed; inset: 0;
  pointer-events: none; z-index: 9999;
  opacity: .022;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
}

/* ============================================================
   NAVIGATION
   ============================================================ */
nav {
  position: fixed; top: 0; left: 0; width: 100%;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(8,12,18,0.84);
  backdrop-filter: blur(18px) saturate(1.5);
  -webkit-backdrop-filter: blur(18px) saturate(1.5);
  border-bottom: 1px solid var(--color-border);
  transition: height var(--transition), background var(--transition);
}
html[data-theme="light"] nav {
  background: rgba(245,243,238,0.88);
}
nav.scrolled {
  height: 60px;
  background: rgba(8,12,18,0.95);
}
html[data-theme="light"] nav.scrolled {
  background: rgba(245,243,238,0.97);
}

.nav-inner {
  max-width: 1240px; margin: 0 auto;
  height: 100%; padding: 0 2rem;
  display: flex; align-items: center;
  justify-content: space-between; gap: 1.5rem;
}

.nav-logo {
  display: flex; align-items: center; gap: .65rem;
  text-decoration: none; flex-shrink: 0;
}
.nav-logo .logo-mark { width: 38px; height: 38px; }
.nav-logo .logo-text {
  font-family: var(--font-display);
  font-size: 1.45rem; font-weight: 600;
  color: var(--color-text); letter-spacing: .02em; line-height: 1;
}
.nav-logo .logo-text em { font-style: normal; color: var(--color-gold); }
.nav-logo .logo-sub {
  font-family: var(--font-body);
  font-size: .62rem; font-weight: 400;
  color: var(--color-text-muted);
  letter-spacing: .18em; text-transform: uppercase;
  display: block; margin-top: 3px;
}

.nav-links {
  display: flex; align-items: center;
  gap: .15rem; list-style: none;
}
.nav-links a {
  font-size: .77rem; font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: .10em; text-transform: uppercase;
  padding: .45rem .75rem; border-radius: 6px;
  position: relative; transition: color var(--transition), background var(--transition);
}
.nav-links a:hover {
  color: var(--color-text);
  background: rgba(201,168,76,0.07);
}
.nav-links a.active {
  color: var(--color-gold-light);
  background: var(--color-gold-dim);
}
html[data-theme="light"] .nav-links a:hover { background: rgba(201,168,76,0.10); }
html[data-theme="light"] .nav-links a.active { color: var(--color-gold); }

/* Theme toggle */
.theme-toggle {
  width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--color-border);
  background: transparent; flex-shrink: 0;
  display: grid; place-items: center;
  cursor: pointer; color: var(--color-gold-light);
  transition: border-color var(--transition), background var(--transition), transform .15s;
}
.theme-toggle:hover { border-color: var(--color-border-glow); background: var(--color-gold-dim); transform: translateY(-1px); }
.theme-toggle svg { width: 17px; height: 17px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.theme-toggle .icon-moon { display: none; }
html[data-theme="light"] .theme-toggle { color: #111821; }
html[data-theme="light"] .theme-toggle .icon-sun { display: none; }
html[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* Hamburger */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: .5rem; margin-left: .5rem; }
.hamburger span { width: 22px; height: 2px; background: var(--color-gold); border-radius: 2px; transition: var(--transition); }

/* ============================================================
   SECTIONS & LAYOUT
   ============================================================ */
section {
  padding: 5.5rem 2rem;
}
.section-inner {
  max-width: 1140px; margin: 0 auto;
}
.section-label {
  font-family: var(--font-mono);
  font-size: .7rem; letter-spacing: .22em;
  text-transform: uppercase; color: var(--color-teal);
  display: block; margin-bottom: .6rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.2vw, 2.8rem);
  font-weight: 300; letter-spacing: -.01em;
  color: var(--color-text); margin-bottom: 1rem;
}
.section-title strong { font-weight: 600; }

/* ── Reveal animations ──────────────────────────────────────── */
.reveal {
  opacity: 0; transform: translateY(26px);
  transition: opacity .7s cubic-bezier(.4,0,.2,1), transform .7s cubic-bezier(.4,0,.2,1);
}
.reveal.visible { opacity: 1; transform: none; }

.reveal-group > * {
  opacity: 0; transform: translateY(20px);
  transition: opacity .6s cubic-bezier(.4,0,.2,1), transform .6s cubic-bezier(.4,0,.2,1);
}
.reveal-group.visible > *:nth-child(1) { transition-delay: .05s; }
.reveal-group.visible > *:nth-child(2) { transition-delay: .13s; }
.reveal-group.visible > *:nth-child(3) { transition-delay: .21s; }
.reveal-group.visible > *:nth-child(4) { transition-delay: .29s; }
.reveal-group.visible > *:nth-child(5) { transition-delay: .37s; }
.reveal-group.visible > *:nth-child(6) { transition-delay: .45s; }
.reveal-group.visible > * { opacity: 1; transform: none; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: none; }
}
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .72rem 1.65rem; border-radius: var(--radius-sm);
  font-family: var(--font-body); font-size: .82rem; font-weight: 500;
  letter-spacing: .04em; cursor: pointer; transition: all var(--transition);
  border: none; text-decoration: none; white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #c9a84c, #e6c96a);
  color: #0a0c10;
  font-weight: 600;
  letter-spacing: 0.02em;

  border-radius: 999px;
  padding: 0.7rem 1.4rem;

  box-shadow: 
    0 6px 28px rgba(201,168,76,0.35),
    0 0 0 rgba(201,168,76,0.0);

  position: relative;
  overflow: hidden;

  transition: all 0.25s ease;
}

/* subtle glowing pulse (very important, not flashy) */
.btn-primary.btn-hiring {
  animation: pulseGlow 3.5s ease-in-out infinite;
}

/* hover interaction */
.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 
    0 10px 36px rgba(201,168,76,0.45),
    0 0 12px rgba(201,168,76,0.25);
}

/* click feel */
.btn-primary:active {
  transform: translateY(0px) scale(0.98);
}

/* shimmer sweep (very subtle premium effect) */
.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -120%;
  width: 120%;
  height: 100%;
  background: linear-gradient(
    120deg,
    transparent,
    rgba(255,255,255,0.25),
    transparent
  );
  transition: all 0.6s ease;
}

.btn-primary:hover::after {
  left: 120%;
}

/* pulse animation */
@keyframes pulseGlow {
  0% {
    box-shadow: 0 6px 28px rgba(201,168,76,0.30);
  }
  50% {
    box-shadow: 0 10px 36px rgba(201,168,76,0.55);
  }
  100% {
    box-shadow: 0 6px 28px rgba(201,168,76,0.30);
  }
}

.btn-primary:hover { background: var(--color-gold-light); color: #0a0c10; transform: translateY(-2px); box-shadow: 0 8px 32px rgba(201,168,76,0.35); }
.btn-outline {
  background: transparent; color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-outline:hover { border-color: var(--color-border-glow); background: var(--color-gold-dim); color: var(--color-gold-light); transform: translateY(-2px); }
html[data-theme="light"] .btn-outline:hover { color: var(--color-gold); }
.btn-hiring {
  background: var(--color-teal); color: #081010;
  box-shadow: 0 4px 20px rgba(95,184,176,0.25);
}
.btn-hiring:hover { background: #7ecec8; color: #081010; transform: translateY(-2px); }

/* ============================================================
   HERO (index.html)
   ============================================================ */

.hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;

  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;

  padding: 7rem 1.5rem 5rem;
  text-align: center;
}

/* Soft AI / systems-biology background */
.hero::before {
  content: "";
  position: absolute;
  inset: -12% -8%;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 14% 22%, rgba(95, 184, 176, 0.16), transparent 26%),
    radial-gradient(circle at 84% 16%, rgba(201, 168, 76, 0.14), transparent 24%),
    radial-gradient(circle at 52% 72%, rgba(128, 138, 255, 0.10), transparent 30%),
    radial-gradient(circle at 60% 40%, rgba(255, 255, 255, 0.05), transparent 18%);
  filter: blur(28px);
  opacity: 0.95;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.24;
  background-image: radial-gradient(rgba(201, 168, 76, 0.16) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(ellipse 78% 68% at center, black 18%, transparent 82%);
  -webkit-mask-image: radial-gradient(ellipse 78% 68% at center, black 18%, transparent 82%);
}

/* Light mode tuning */
html[data-theme="light"] .hero::before {
  background:
    radial-gradient(circle at 14% 22%, rgba(95, 184, 176, 0.12), transparent 26%),
    radial-gradient(circle at 84% 16%, rgba(201, 168, 76, 0.11), transparent 24%),
    radial-gradient(circle at 52% 72%, rgba(128, 138, 255, 0.08), transparent 30%),
    radial-gradient(circle at 60% 40%, rgba(255, 255, 255, 0.52), transparent 18%);
  opacity: 0.88;
}

html[data-theme="light"] .hero::after {
  opacity: 0.18;
  background-image: radial-gradient(rgba(145, 115, 35, 0.14) 1px, transparent 1px);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.42rem 1.05rem;
  margin-bottom: 2rem;
  border-radius: 999px;

  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;

  border: 1px solid rgba(201, 168, 76, 0.22);
  background: rgba(201, 168, 76, 0.10);
  color: var(--color-gold-light);

  box-shadow:
    0 4px 18px rgba(201, 168, 76, 0.10),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);

  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);

  animation: fadeUp 0.8s 0.1s both;
}

html[data-theme="light"] .hero-badge {
  background: rgba(201, 168, 76, 0.16);
  border-color: rgba(160, 125, 35, 0.28);
  color: #6f5312;
  box-shadow:
    0 6px 20px rgba(201, 168, 76, 0.14),
    inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex: 0 0 auto;
  background: var(--color-teal);
  box-shadow: 0 0 10px rgba(95, 184, 176, 0.35);
  animation: pulseSoft 2s ease-in-out infinite;
}

@keyframes pulseSoft {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.18);
  }
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(3rem, 6.5vw, 5rem);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--color-text);
  animation: fadeUp 0.9s 0.28s both;
}

.hero h1 em {
  font-style: italic;
  font-weight: 400;
  color: var(--color-gold-light);
}

html[data-theme="light"] .hero h1 em {
  color: #9a7418;
}

.hero-desc {
  margin: 1.8rem auto 0;
  max-width: 620px;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--color-text-muted);
  animation: fadeUp 0.9s 0.45s both;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2.8rem;
  animation: fadeUp 0.9s 0.6s both;
}

/* Stats row on hero */
.hero-stats {
  margin-top: 4rem; padding-top: 2.5rem;
  border-top: 1px solid var(--color-border);
  display: flex; justify-content: center; gap: 4rem; flex-wrap: wrap;
  animation: fadeUp .9s .75s both;
}
.hero-stat { text-align: center; }
.hero-stat .stat-num {
  font-family: var(--font-display);
  font-size: 2.4rem; font-weight: 500;
  color: var(--color-gold-light); line-height: 1;
}
.hero-stat .stat-label {
  font-size: .73rem; color: var(--color-text-muted);
  letter-spacing: .12em; text-transform: uppercase; margin-top: .3rem;
}

/* ── Home sections ──────────────────────────────────────────── */
.highlight-strip {
  background: linear-gradient(135deg, var(--color-gold-dim), var(--color-teal-dim));
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 1.8rem 2rem;
  overflow: hidden;
}
.strip-inner {
  max-width: 1140px; margin: 0 auto;
  display: flex; align-items: center; gap: 2rem; flex-wrap: wrap;
}
.strip-label {
  font-family: var(--font-mono);
  font-size: .68rem; letter-spacing: .22em;
  text-transform: uppercase; color: var(--color-teal);
  flex-shrink: 0;
}
.strip-items {
  display: flex; gap: 2.5rem; flex-wrap: wrap; align-items: center;
}
.strip-item {
  font-size: .82rem; color: var(--color-text-muted);
  display: flex; align-items: center; gap: .5rem;
}
.strip-item::before {
  content: ''; width: 4px; height: 4px; border-radius: 50%;
  background: var(--color-gold); flex-shrink: 0;
}

/* research cards on home */
.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}
.research-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.8rem 1.8rem;
  transition: border-color var(--transition), background var(--transition), transform var(--transition), box-shadow var(--transition);
  cursor: default;
}
.research-card:hover {
  border-color: var(--color-border-glow);
  background: var(--color-bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 48px var(--color-shadow);
}
.research-num {
  font-family: var(--font-mono); font-size: .68rem;
  color: var(--color-teal); letter-spacing: .2em;
  text-transform: uppercase; margin-bottom: 1rem; display: block;
}
.research-card h3 {
  font-family: var(--font-display); font-size: 1.3rem;
  font-weight: 500; margin-bottom: .75rem;
}
.research-card p {
  font-size: .88rem; color: var(--color-text-muted); line-height: 1.75;
}
.research-card .card-tag {
  display: inline-block; margin-top: 1rem;
  font-family: var(--font-mono); font-size: .68rem;
  color: var(--color-gold); letter-spacing: .12em;
  text-transform: uppercase; border: 1px solid var(--color-border);
  padding: .25rem .65rem; border-radius: 4px;
}

/* collab strip on home */
.collab-logos {
  display: flex; flex-wrap: wrap; gap: 1rem; align-items: center;
  margin-top: 2rem;
}
.collab-tag {
  font-size: .78rem; font-weight: 500;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  background: var(--color-gold-dim);
  padding: .35rem .85rem; border-radius: 4px;
  transition: border-color var(--transition), color var(--transition);
}
.collab-tag:hover { border-color: var(--color-border-glow); color: var(--color-gold-light); }
html[data-theme="light"] .collab-tag:hover { color: var(--color-gold); }

/* ============================================================
   PAGE HERO  (inner pages)
   ============================================================ */
.page-hero {
  padding: calc(var(--nav-h) + 4rem) 2rem 2.5rem;
  position: relative;
}
.page-hero::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}
.page-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 300; letter-spacing: -.015em;
  margin-bottom: .8rem; line-height: 1.1;
}
.page-subtitle {
  font-size: 1rem; color: var(--color-text-muted);
  max-width: none; line-height: 1.8;
}




.collab-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.collab-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  justify-content: flex-start;
  align-content: center;
}

.collab-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: rgba(255,255,255,0.03);
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.88rem;
  line-height: 1.4;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition), color var(--transition);
}

html[data-theme="light"] .collab-tag {
  background: rgba(0,0,0,0.025);
}

.collab-tag:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-glow);
  box-shadow: 0 10px 24px var(--color-shadow);
  color: var(--color-gold-light);
}

html[data-theme="light"] .collab-tag:hover {
  color: var(--color-gold);
}

@media (max-width: 900px) {
  .collab-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3.5rem; align-items: start;
  margin-bottom: 4rem;
}
.about-photo-wrap { position: relative; }
.about-photo-frame {
  border-radius: 18px; overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  box-shadow: 0 20px 60px var(--color-shadow);
  aspect-ratio: 1;
}
.about-photo-frame img { width: 100%; height: 100%; object-fit: cover; display: block; }

.about-text h2 {
  font-family: var(--font-display);
  font-size: 2rem; font-weight: 500; margin-bottom: .25rem;
}
.pi-title {
  font-family: var(--font-mono); font-size: .75rem;
  color: var(--color-gold); letter-spacing: .18em;
  text-transform: uppercase; margin-bottom: 1.5rem;
}
.about-text p {
  font-size: .95rem; color: var(--color-text);
  margin-bottom: 1rem; line-height: 1.85;
}
html[data-theme="light"] .about-text p { color: var(--color-text-muted); }

/* Career/Education timeline */
.timeline { margin: 1.8rem 0; }
.timeline-group { margin-bottom: 1.5rem; }
.timeline-group h4 {
  font-family: var(--font-mono); font-size: .7rem;
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--color-teal); margin-bottom: .65rem;
}
.timeline-item {
  display: flex; gap: 1rem;
  padding: .6rem 0; border-bottom: 1px solid var(--color-border);
  font-size: .88rem;
}
.timeline-item:last-child { border-bottom: none; }
.t-year {
  font-family: var(--font-mono); font-size: .78rem;
  color: var(--color-gold); min-width: 100px; padding-top: .05em;
}
.t-body { color: var(--color-text); }
html[data-theme="light"] .t-body { color: var(--color-text-muted); }
.t-body strong { color: var(--color-text); }

.about-links { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.5rem; }
.about-link {
  display: inline-flex; align-items: center; gap: .4rem;
  font-size: .8rem; color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  padding: .4rem .9rem; border-radius: 6px;
  transition: all var(--transition);
}
.about-link:hover {
  color: var(--color-gold-light); border-color: var(--color-border-glow);
  background: var(--color-gold-dim);
}
html[data-theme="light"] .about-link:hover { color: var(--color-gold); }
.about-link svg { flex-shrink: 0; }

/* divider */
.section-divider {
  border: none; height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  margin: 3.5rem 0;
}

/* ============================================================
   RESEARCH PAGE
   ============================================================ */
.direction-row {
  display: block;
  padding: 2.2rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--color-bg-card), rgba(255,255,255,0));
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 40px var(--color-shadow);
  margin-bottom: 1.5rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.direction-row:hover {
  border-color: var(--color-border-glow);
  transform: translateY(-3px);
  box-shadow: 0 20px 56px var(--color-shadow);
}

.direction-content {
  max-width: 100%;
}

.direction-kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-teal);
  display: block;
  margin-bottom: 0.5rem;
}

.direction-row h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  margin: 0 0 0.5rem;
}

.direction-sub {
  font-style: italic;
  color: var(--color-text-muted);
  margin: 0 0 0.9rem;
  font-size: 0.9rem;
}

.direction-row p {
  font-size: 0.9rem;
  color: var(--color-text);
  margin-bottom: 0.9rem;
  line-height: 1.8;
}

html[data-theme="light"] .direction-row p {
  color: var(--color-text-muted);
}

.direction-row ul {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  font-size: 0.88rem;
  color: var(--color-text);
}

html[data-theme="light"] .direction-row ul {
  color: var(--color-text-muted);
}

.direction-row ul li {
  margin-bottom: 0.3rem;
}

.mini-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  background: rgba(255,255,255,0.02);
  font-size: 0.88rem;
}

html[data-theme="light"] .mini-card {
  background: rgba(0,0,0,0.02);
}

.mini-card ul {
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
  color: var(--color-text-muted);
}

.mini-card ul li {
  margin-bottom: 0.3rem;
}

.figure-card {
  margin: 1.6rem auto 1.35rem;
  padding: 0;
  border: none;
  background: transparent;
  box-shadow: none;
  text-align: center;
  overflow: visible;
}

.figure-card img {
  width: 100%;
  max-width: 920px;
  height: auto;
  display: block;
  margin: 0 auto;
  object-fit: contain;
  border-radius: 10px;
}

.figure-placeholder {
  width: 100%;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-dim);
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.rep-work {
  margin-top: 1.1rem;
}

.rep-title {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.paper-list {
  margin: 0;
  padding-left: 1.2rem;
}

.paper-list li {
  font-size: 0.87rem;
  margin-bottom: 0.35rem;
}

.paper-list a {
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.paper-list a:hover {
  color: var(--color-gold-light);
}

html[data-theme="light"] .paper-list a:hover {
  color: var(--color-gold);
}

@media (max-width: 900px) {
  .direction-row {
    padding: 1.4rem;
  }

  .direction-row h3 {
    font-size: 1.3rem;
  }

  .figure-card {
    padding: 0.5rem;
    margin: 1.25rem auto 1.1rem;
  }
}

/* ============================================================
   PUBLICATIONS PAGE
   ============================================================ */
.pub-filters {
  display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 2rem;
}
.pub-filter-btn {
  font-size: .73rem; font-weight: 500; letter-spacing: .10em;
  text-transform: uppercase; color: var(--color-text-muted);
  border: 1px solid var(--color-border); background: transparent;
  padding: .4rem .9rem; border-radius: 5px; cursor: pointer;
  transition: all var(--transition);
}
.pub-filter-btn:hover { border-color: var(--color-border-glow); color: var(--color-text); }
.pub-filter-btn.active { background: var(--color-gold-dim); color: var(--color-gold-light); border-color: var(--color-gold); }
html[data-theme="light"] .pub-filter-btn.active { color: var(--color-gold); }

.pub-year-group { margin-bottom: 2.4rem; }
.pub-year-heading {
  font-family: var(--font-mono); font-size: .78rem;
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--color-gold); margin-bottom: 1rem;
  padding-bottom: .5rem; border-bottom: 1px solid var(--color-border);
}

.pub-card {
  display: grid; grid-template-columns: 60px 1fr;
  gap: 1.2rem; padding: 1.2rem 1.4rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius); background: var(--color-bg-card);
  margin-bottom: .8rem;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}
.pub-card:hover {
  border-color: var(--color-border-glow);
  background: var(--color-bg-card-hover);
  transform: translateX(4px);
}
.pub-num {
  font-family: var(--font-mono); font-size: .78rem;
  color: var(--color-text-dim); padding-top: .2em;
  text-align: right;
}
.pub-content h4 {
  font-family: var(--font-display); font-size: 1.05rem;
  font-weight: 500; margin-bottom: .35rem;
  line-height: 1.35;
}
.pub-authors {
  font-size: .82rem; color: var(--color-text-muted);
  margin-bottom: .3rem; line-height: 1.6;
}
.pub-authors strong { color: var(--color-text); }
.pub-journal {
  font-size: .82rem; color: var(--color-teal);
  font-style: italic; margin-bottom: .5rem;
}
.pub-links { display: flex; gap: .85rem; flex-wrap: wrap; }
.pub-links a {
  font-size: .75rem; font-family: var(--font-mono);
  color: var(--color-gold-light); letter-spacing: .06em;
  border-bottom: 1px solid rgba(201,168,76,.3);
  transition: color var(--transition), border-color var(--transition);
}
.pub-links a:hover { color: #fff; border-color: #fff; }
html[data-theme="light"] .pub-links a:hover { color: var(--color-gold); border-color: var(--color-gold); }
.pub-badge {
  display: inline-block; font-size: .67rem; font-family: var(--font-mono);
  letter-spacing: .1em; text-transform: uppercase;
  padding: .18rem .55rem; border-radius: 4px; margin-left: .5rem;
  vertical-align: middle;
}
.pub-badge-highlight { background: rgba(201,168,76,.15); color: var(--color-gold); border: 1px solid rgba(201,168,76,.3); }
.pub-badge-teal { background: rgba(95,184,176,.12); color: var(--color-teal); border: 1px solid rgba(95,184,176,.3); }

/* sub-note under pub (editorial, etc.) */
.pub-note {
  margin-top: .5rem; padding: .5rem .8rem;
  background: rgba(95,184,176,.06); border-left: 2px solid var(--color-teal);
  border-radius: 0 6px 6px 0; font-size: .8rem; color: var(--color-text-muted);
}
.pub-note a { font-size: .8rem; }

/* ============================================================
   TEAM PAGE
   ============================================================ */
.team-grid {
  display: grid; grid-template-columns: repeat(12,1fr); gap: 1.2rem;
}
.profile-card {
  grid-column: span 6;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-card);
  padding: 1.6rem;
  display: flex; gap: 1.4rem; align-items: flex-start;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.profile-card:hover { border-color: var(--color-border-glow); transform: translateY(-3px); box-shadow: 0 16px 48px var(--color-shadow); }
.profile-card.pi-card { grid-column: span 12; background: linear-gradient(145deg, var(--color-bg-card), rgba(201,168,76,.04)); }

.profile-photo {
  width: 100px; height: 100px; flex-shrink: 0;
  border-radius: 14px; overflow: hidden;
  border: 1px solid var(--color-border);
  background: rgba(255,255,255,.03);
  display: grid; place-items: center;
}
.profile-card.pi-card .profile-photo { width: 130px; height: 130px; }
.profile-photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.initials {
  font-family: var(--font-mono); font-size: 1rem;
  color: var(--color-gold-light); opacity: .85;
}
.profile-meta { flex: 1; }
.profile-meta h3 { font-size: 1rem; margin-bottom: .18rem; }
.profile-meta .role { font-size: .78rem; color: var(--color-gold-light); margin-bottom: .6rem; display: block; }
html[data-theme="light"] .profile-meta .role { color: var(--color-gold); }
.profile-meta p { font-size: .85rem; color: var(--color-text-muted); margin-bottom: .65rem; line-height: 1.65; }
.profile-links { display: flex; flex-wrap: wrap; gap: .5rem .8rem; }
.profile-links a { font-size: .8rem; color: var(--color-text-muted); transition: color var(--transition); }
.profile-links a:hover { color: var(--color-gold-light); }
html[data-theme="light"] .profile-links a:hover { color: var(--color-gold); }

/* Open position cards - lighter style */
.profile-card.open { border-style: dashed; opacity: .75; }
.profile-card.open:hover { opacity: 1; }

/* ============================================================
   HIRING PAGE
   ============================================================ */
.hiring-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.hiring-block {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-card);
  padding: 1.8rem;
  transition: border-color var(--transition), transform var(--transition);
}
.hiring-block:hover { border-color: var(--color-border-glow); transform: translateY(-3px); }
.hiring-block.full-width { grid-column: span 2; }
.kicker {
  display: inline-flex; align-items: center; gap: .4rem;
  font-family: var(--font-mono); font-size: .7rem;
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--color-gold); margin-bottom: .75rem;
}
.hiring-block h3 { font-family: var(--font-display); font-size: 1.25rem; font-weight: 500; margin-bottom: .8rem; }
.hiring-block ul {
  padding-left: 1.2rem; font-size: .88rem;
  color: var(--color-text-muted); margin-bottom: 1rem;
}
.hiring-block ul li { margin-bottom: .35rem; }
.hiring-block p { font-size: .88rem; color: var(--color-text-muted); line-height: 1.75; }

.apply-box {
  background: linear-gradient(135deg, var(--color-gold-dim), var(--color-teal-dim));
  border: 1px solid var(--color-border-glow);
  border-radius: var(--radius-lg); padding: 2.4rem;
  margin-top: 2rem; text-align: center;
}
.apply-box h3 { font-family: var(--font-display); font-size: 1.6rem; font-weight: 400; margin-bottom: .5rem; }
.apply-box p { color: var(--color-text-muted); font-size: .9rem; margin-bottom: 1.5rem; }
.apply-email {
  font-family: var(--font-mono); font-size: 1rem;
  color: var(--color-gold-light); display: block; margin-bottom: 1.5rem;
}
html[data-theme="light"] .apply-email { color: var(--color-gold); }

/* ============================================================
   NEWS PAGE
   ============================================================ */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.4rem; margin-top: 2rem;
}
.news-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-card); overflow: hidden;
  display: flex; flex-direction: column;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.news-card:hover {
  border-color: var(--color-border-glow);
  transform: translateY(-4px); box-shadow: 0 20px 48px var(--color-shadow);
}
.news-img {
  height: 180px; overflow: hidden; background: var(--color-surface);
  display: flex; align-items: center; justify-content: center;
}
.news-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.news-body { padding: 1.4rem; flex: 1; display: flex; flex-direction: column; }
.news-date {
  font-family: var(--font-mono); font-size: .7rem;
  color: var(--color-text-dim); letter-spacing: .15em;
  text-transform: uppercase; margin-bottom: .5rem;
}
.news-card h4 { font-family: var(--font-display); font-size: 1.1rem; font-weight: 500; margin-bottom: .6rem; }
.news-card p { font-size: .87rem; color: var(--color-text-muted); line-height: 1.7; flex: 1; }
.news-tag {
  display: inline-block; margin-top: 1rem;
  font-family: var(--font-mono); font-size: .66rem;
  color: var(--color-teal); letter-spacing: .12em; text-transform: uppercase;
  border: 1px solid rgba(95,184,176,.3); padding: .2rem .55rem; border-radius: 4px;
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: 4rem 2rem 0;
  margin-top: 4rem;
}
.footer-inner {
  max-width: 1140px; margin: 0 auto;
  display: grid; grid-template-columns: 1.5fr 1fr 1fr;
  gap: 3rem;
}
.footer-logo-wrap { display: flex; align-items: center; gap: .6rem; margin-bottom: .9rem; }
.footer-logo-text { font-family: var(--font-display); font-size: 1.3rem; font-weight: 600; color: var(--color-text); }
.footer-logo-text em { font-style: normal; color: var(--color-gold); }
.footer-brand p { font-size: .83rem; color: var(--color-text-dim); line-height: 1.75; }
.footer-col h5 {
  font-family: var(--font-mono); font-size: .68rem;
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--color-gold); margin-bottom: 1rem;
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: .5rem; }
.footer-col ul li a {
  font-size: .83rem; color: var(--color-text-dim);
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--color-gold-light); }
html[data-theme="light"] .footer-col ul li a:hover { color: var(--color-gold); }
.footer-bottom {
  max-width: 1140px; margin: 2rem auto 0;
  padding: 1.6rem 0 2rem;
  border-top: 1px solid var(--color-border);
  display: flex; justify-content: space-between;
  align-items: center; flex-wrap: wrap; gap: .5rem;
}
.footer-bottom p { font-size: .74rem; color: var(--color-text-dim); }

/* ============================================================
   UTILITIES
   ============================================================ */
.dot {
  display: inline-block; width: 7px; height: 7px;
  border-radius: 50%; background: var(--color-teal);
  animation: pulse 2.2s ease-in-out infinite;
}

.text-gold { color: var(--color-gold-light); }
html[data-theme="light"] .text-gold { color: var(--color-gold); }
.text-teal { color: var(--color-teal); }
.text-muted { color: var(--color-text-muted); }

.cta-row { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; margin-top: 2rem; }

/* inline code */
code {
  font-family: var(--font-mono); font-size: .85em;
  background: var(--color-gold-dim); color: var(--color-gold-light);
  padding: .1em .4em; border-radius: 4px;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .research-grid { grid-template-columns: 1fr 1fr; }
  .profile-card { grid-column: span 12; }
}
@media (max-width: 900px) {
  .about-layout { grid-template-columns: 1fr; }
  .about-photo-wrap { max-width: 260px; }
  .direction-row { grid-template-columns: 1fr; }
  .figure-card { display: none; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .hiring-grid { grid-template-columns: 1fr; }
  .hiring-block.full-width { grid-column: span 1; }
}
@media (max-width: 700px) {
  .research-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 2rem; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: rgba(8,12,18,.97); padding: 1.5rem 1.5rem;
    gap: .2rem; border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
  }
  html[data-theme="light"] .nav-links.open { background: rgba(245,243,238,.97); }
  .nav-links.open a { padding: .75rem 1rem; border-radius: 8px; }
  section { padding: 4rem 1.4rem; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .pub-card { grid-template-columns: 1fr; }
  .pub-num { text-align: left; }
}