/* =========================================================
   Md. Omar Sha Rafi — Portfolio
   Dual theme: "Scientific" (dark) + "Academic" (light)
   ========================================================= */

/* ---------- Theme tokens ---------- */
:root {
  /* Scientific (dark) — default */
  --bg:            #070b14;
  --bg-2:          #0b1120;
  --panel:         rgba(17, 26, 46, 0.55);
  --panel-solid:   #0e1626;
  --border:        rgba(120, 160, 220, 0.14);
  --border-strong: rgba(120, 160, 220, 0.28);

  --text:          #e6edf7;
  --text-soft:     #aebbd0;
  --text-muted:    #7d8aa3;

  --accent:        #38bdf8;   /* cyan */
  --accent-2:      #34d399;   /* emerald */
  --accent-3:      #a78bfa;   /* violet */
  --accent-rgb:    56, 189, 248;
  --accent-2-rgb:  52, 211, 153;

  --grad:          linear-gradient(120deg, #38bdf8 0%, #34d399 55%, #a78bfa 100%);
  --glow:          0 0 40px rgba(56, 189, 248, 0.25);
  --shadow:        0 24px 60px -20px rgba(0, 0, 0, 0.7);
  --card-hover:    rgba(23, 34, 58, 0.8);

  --font-display:  'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body:     'Inter', 'Segoe UI', sans-serif;
  --font-mono:     'JetBrains Mono', monospace;

  --maxw:          1180px;
  --radius:        18px;
  --radius-sm:     12px;

  --canvas-opacity: 0.9;
  color-scheme: dark;
}

[data-theme="light"] {
  /* Academic (light) */
  --bg:            #f6f2e9;
  --bg-2:          #efe9db;
  --panel:         rgba(255, 255, 255, 0.72);
  --panel-solid:   #fffdf8;
  --border:        rgba(78, 52, 40, 0.16);
  --border-strong: rgba(78, 52, 40, 0.32);

  --text:          #201a15;
  --text-soft:     #4b4136;
  --text-muted:    #7a6e5e;

  --accent:        #8a2b3a;   /* academic burgundy */
  --accent-2:      #1d5c53;   /* deep teal-green */
  --accent-3:      #b0842f;   /* antique gold */
  --accent-rgb:    138, 43, 58;
  --accent-2-rgb:  29, 92, 83;

  --grad:          linear-gradient(120deg, #8a2b3a 0%, #b0842f 55%, #1d5c53 100%);
  --glow:          0 0 40px rgba(138, 43, 58, 0.14);
  --shadow:        0 24px 50px -24px rgba(74, 52, 30, 0.45);
  --card-hover:    #ffffff;

  --font-display:  'Fraunces', 'Georgia', serif;

  --canvas-opacity: 0.5;
  color-scheme: light;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background 0.6s ease, color 0.6s ease;
}

/* animated gradient wash behind everything */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60% 55% at 15% 0%, rgba(var(--accent-rgb), 0.12), transparent 60%),
    radial-gradient(50% 50% at 100% 20%, rgba(var(--accent-2-rgb), 0.10), transparent 55%),
    radial-gradient(60% 60% at 50% 100%, rgba(var(--accent-rgb), 0.08), transparent 60%);
  transition: opacity 0.6s ease;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

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

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Molecular canvas ---------- */
.molecular-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  opacity: var(--canvas-opacity);
  transition: opacity 0.6s ease;
  pointer-events: none;
}

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: var(--grad);
  z-index: 200;
  box-shadow: var(--glow);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 10px 30px -20px rgba(0,0,0,0.6);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  transition: padding 0.4s ease;
}
.nav.is-scrolled .nav__inner { padding: 12px 26px; }

.nav__brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 600; letter-spacing: 0.02em; }
.nav__brand-mark { color: var(--accent); display: grid; place-items: center; animation: spin 22s linear infinite; }
.nav__brand-text { font-size: 1.05rem; }

.nav__links { display: flex; gap: 26px; }
.nav__links a {
  font-size: 0.9rem;
  color: var(--text-soft);
  position: relative;
  padding: 4px 0;
  transition: color 0.25s ease;
}
.nav__links a::after {
  content: "";
  position: absolute; left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--grad);
  transition: width 0.3s ease;
}
.nav__links a:hover, .nav__links a.is-active { color: var(--text); }
.nav__links a:hover::after, .nav__links a.is-active::after { width: 100%; }

.nav__actions { display: flex; align-items: center; gap: 14px; }

/* Theme toggle */
.theme-toggle {
  display: flex; align-items: center; gap: 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 14px 5px 5px;
  cursor: pointer;
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: border-color 0.3s ease, color 0.3s ease, background 0.3s ease;
}
.theme-toggle:hover { border-color: var(--border-strong); color: var(--text); }
.theme-toggle__track {
  width: 42px; height: 24px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 30%, var(--bg-2));
  position: relative;
  flex: none;
  transition: background 0.4s ease;
}
.theme-toggle__thumb {
  position: absolute;
  top: 3px; left: 3px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent);
  color: #04121f;
  display: grid; place-items: center;
  transition: transform 0.4s cubic-bezier(.5,.15,.2,1), background 0.4s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}
[data-theme="light"] .theme-toggle__thumb { transform: translateX(18px); color: #fff; }
.theme-toggle__thumb .icon-sun { display: none; }
.theme-toggle__thumb .icon-moon { display: block; }
[data-theme="light"] .theme-toggle__thumb .icon-sun { display: block; }
[data-theme="light"] .theme-toggle__thumb .icon-moon { display: none; }
.theme-toggle__label { min-width: 62px; text-align: left; }

/* Burger */
.nav__burger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav__burger span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: transform 0.3s ease, opacity 0.3s ease; }
.nav__burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 13px 24px;
  border-radius: 999px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.25s ease, box-shadow 0.3s ease, background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}
.btn svg { transition: transform 0.25s ease; }
.btn--primary { background: var(--grad); color: #06121e; box-shadow: 0 12px 30px -12px rgba(var(--accent-rgb), 0.7); }
[data-theme="light"] .btn--primary { color: #fff; }
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 18px 40px -12px rgba(var(--accent-rgb), 0.8); }
.btn--primary:hover svg { transform: translateX(4px); }
.btn--ghost { background: var(--panel); border-color: var(--border-strong); color: var(--text); backdrop-filter: blur(6px); }
.btn--ghost:hover { transform: translateY(-3px); border-color: var(--accent); color: var(--accent); }
.btn--sm { padding: 10px 18px; font-size: 0.85rem; }

/* ---------- Sections ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 96px 26px;
  position: relative;
}
.section__head { margin-bottom: 52px; max-width: 760px; }
.section__index {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.section__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.8rem, 4vw, 2.9rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
}
.section__lead { margin-top: 18px; color: var(--text-soft); font-size: 1.05rem; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
}
.eyebrow__dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 12px var(--accent-2); animation: pulse 2.2s ease-in-out infinite; }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 130px 26px 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 60px;
  align-items: center;
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 7vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 20px 0 14px;
}
.hero__role {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.05rem, 2.4vw, 1.4rem);
  color: var(--text);
  margin-bottom: 20px;
}
.hero__lead { color: var(--text-soft); font-size: 1.08rem; max-width: 560px; margin-bottom: 34px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 30px; }
.hero__socials { display: flex; gap: 12px; }
.hero__socials a {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-soft);
  background: var(--panel);
  transition: transform 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.hero__socials a:hover { transform: translateY(-4px); color: var(--accent); border-color: var(--accent); box-shadow: var(--glow); }

/* Portrait */
.hero__portrait { display: grid; place-items: center; }
.portrait { position: relative; width: min(360px, 80vw); aspect-ratio: 3 / 3.4; }
.portrait__ring {
  position: absolute;
  inset: -22px;
  border-radius: 26px;
  background: conic-gradient(from 0deg, rgba(var(--accent-rgb),0.6), rgba(var(--accent-2-rgb),0.5), rgba(167,139,250,0.4), rgba(var(--accent-rgb),0.6));
  filter: blur(22px);
  opacity: 0.55;
  animation: spin 14s linear infinite;
}
.portrait__frame {
  position: relative;
  width: 100%; height: 100%;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow);
  background: var(--panel-solid);
}
.portrait__frame img { width: 100%; height: 100%; object-fit: cover; object-position: center 20%; }
.portrait__frame::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, color-mix(in srgb, var(--bg) 65%, transparent));
  pointer-events: none;
}
.portrait__badge {
  position: absolute;
  background: var(--panel-solid);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
}
.portrait__badge--1 { top: 12%; left: -34px; animation: float 5s ease-in-out infinite; }
.portrait__badge--2 { bottom: 14%; right: -30px; color: var(--accent-2); animation: float 6s ease-in-out infinite reverse; }

/* scroll cue */
.hero__scroll {
  position: absolute;
  bottom: 26px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--text-muted);
}
.hero__scroll-mouse { width: 22px; height: 36px; border: 2px solid var(--text-muted); border-radius: 12px; display: flex; justify-content: center; padding-top: 6px; }
.hero__scroll-mouse span { width: 3px; height: 7px; background: var(--accent); border-radius: 2px; animation: scrollDot 1.6s ease-in-out infinite; }
.hero__scroll-text { font-size: 0.65rem; letter-spacing: 0.24em; text-transform: uppercase; }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.4fr 1fr; gap: 50px; align-items: start; }
.about__text p { color: var(--text-soft); margin-bottom: 18px; }
.about__text strong { color: var(--text); font-weight: 600; }
.about__facts { margin-top: 26px; display: grid; gap: 12px; }
.about__facts li { display: flex; align-items: center; gap: 12px; color: var(--text-soft); font-size: 0.98rem; }
.about__facts .mono { color: var(--accent-2); }

.about__stats { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  text-align: center;
  backdrop-filter: blur(8px);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.stat:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: var(--glow); }
.stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2.6rem;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat__label { display: block; margin-top: 10px; font-size: 0.82rem; color: var(--text-muted); letter-spacing: 0.02em; }

/* ---------- Research cards ---------- */
.research-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.rcard {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  backdrop-filter: blur(8px);
  position: relative;
  overflow: hidden;
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease, background 0.35s ease;
}
.rcard::before {
  content: "";
  position: absolute; inset: 0;
  background: var(--grad);
  opacity: 0;
  transition: opacity 0.35s ease;
  mix-blend-mode: overlay;
}
.rcard:hover { transform: translateY(-8px); border-color: var(--border-strong); box-shadow: var(--shadow); background: var(--card-hover); }
.rcard:hover::before { opacity: 0.06; }
.rcard__icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: grid; place-items: center;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid var(--border);
  margin-bottom: 18px;
}
.rcard__icon svg { width: 26px; height: 26px; }
.rcard h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.16rem; margin-bottom: 10px; }
.rcard p { color: var(--text-soft); font-size: 0.95rem; }

/* ---------- Publications ---------- */
.pub-list { display: grid; gap: 16px; counter-reset: pub; }
.pub {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 22px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 26px;
  backdrop-filter: blur(8px);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.pub:hover { transform: translateX(6px); border-color: var(--accent); box-shadow: var(--glow); }
.pub__year {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--accent);
  padding-top: 2px;
  border-right: 1px solid var(--border);
}
.pub__title { font-family: var(--font-display); font-weight: 600; font-size: 1.1rem; line-height: 1.35; margin-bottom: 8px; }
.pub__authors { color: var(--text-soft); font-size: 0.92rem; margin-bottom: 4px; }
.pub__authors .me { color: var(--accent-2); font-weight: 600; }
.pub__venue { color: var(--text-muted); font-size: 0.9rem; }
.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 6px;
  margin-left: 6px;
  vertical-align: middle;
}
.badge--role { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 36%, transparent); }

.conf { margin-top: 34px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 30px; }
.conf__heading { font-size: 0.82rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); margin-bottom: 18px; }
.conf__list { display: grid; gap: 18px; }
.conf__list li { display: grid; gap: 4px; }
.conf__list strong { font-family: var(--font-display); font-weight: 600; font-size: 1rem; }
.conf__list span { color: var(--text-muted); font-size: 0.9rem; }

/* ---------- Timeline ---------- */
.timeline-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 46px; }
.timeline__heading { font-size: 0.82rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); margin-bottom: 26px; }
.timeline { position: relative; }
.tl-item {
  position: relative;
  padding: 0 0 30px 30px;
  border-left: 1px solid var(--border);
}
.tl-item:last-child { border-left-color: transparent; padding-bottom: 0; }
.tl-item__dot {
  position: absolute; left: -6px; top: 4px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent);
}
.tl-item__date { font-size: 0.78rem; color: var(--text-muted); letter-spacing: 0.06em; }
.tl-item__title { font-family: var(--font-display); font-weight: 600; font-size: 1.18rem; margin: 6px 0 2px; }
.tl-item__org { color: var(--accent-2); font-size: 0.92rem; margin-bottom: 10px; }
.tl-item__points { display: grid; gap: 7px; }
.tl-item__points li { position: relative; padding-left: 18px; color: var(--text-soft); font-size: 0.94rem; }
.tl-item__points li::before { content: "▸"; position: absolute; left: 0; color: var(--accent); }

/* ---------- Grants ---------- */
.grants { margin-top: 56px; }
.grant-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grant {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  backdrop-filter: blur(8px);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.grant:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.grant__top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 14px; }
.grant__amount { font-size: 0.9rem; color: var(--accent-3); font-weight: 500; }
.grant__title { font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; line-height: 1.35; margin-bottom: 12px; }
.grant__meta { color: var(--text-muted); font-size: 0.86rem; }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.skillcard {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 26px;
  backdrop-filter: blur(8px);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.skillcard:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.skillcard h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.1rem; margin-bottom: 18px; display: flex; align-items: center; gap: 10px; }
.skillcard__icon { font-size: 1.2rem; }
.tags { display: flex; flex-wrap: wrap; gap: 9px; }
.tags span {
  font-size: 0.82rem;
  padding: 6px 13px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border: 1px solid var(--border);
  color: var(--text-soft);
  transition: transform 0.2s ease, color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.tags span:hover { transform: translateY(-2px); color: var(--accent); border-color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent); }

/* ---------- Teaching ---------- */
.teaching { display: grid; grid-template-columns: 1.5fr 1fr; gap: 40px; align-items: start; }
.teaching__philosophy blockquote {
  font-family: var(--font-display);
  font-size: 1.24rem;
  line-height: 1.5;
  font-weight: 500;
  padding-left: 24px;
  border-left: 3px solid var(--accent);
  margin-bottom: 22px;
  color: var(--text);
}
[data-theme="light"] .teaching__philosophy blockquote { font-style: italic; }
.teaching__philosophy p { color: var(--text-soft); margin-bottom: 24px; }
.teaching__mentorstats { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.teaching__mentorstats div {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  font-size: 0.9rem;
  color: var(--text-soft);
}
.teaching__mentorstats .mono { color: var(--accent); font-size: 1.5rem; font-weight: 500; display: block; }

.teaching__mentorstats { align-content: start; }

.courses-block { margin-top: 52px; }
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.course {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 22px;
  backdrop-filter: blur(8px);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}
.course:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: var(--glow); background: var(--card-hover); }
.course__top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 14px; }
.course__code {
  font-size: 0.76rem;
  color: var(--accent-2);
  padding: 4px 11px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-2) 36%, transparent);
  transition: background 0.3s ease, color 0.3s ease;
}
.course:hover .course__code { background: var(--accent-2); color: var(--bg); }
.course__meta { font-size: 0.7rem; color: var(--text-muted); letter-spacing: 0.06em; }
.course h4 { font-family: var(--font-display); font-weight: 600; font-size: 1.08rem; margin-bottom: 9px; }
.course p { color: var(--text-soft); font-size: 0.9rem; line-height: 1.6; }

/* ---------- Honors ---------- */
.honors-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.honor {
  display: flex; align-items: flex-start; gap: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.honor:hover { transform: translateX(6px); border-color: var(--accent); box-shadow: var(--glow); }
.honor__year { flex: none; font-size: 1.1rem; font-weight: 500; color: var(--accent); min-width: 52px; }
.honor p { color: var(--text-soft); font-size: 0.95rem; }

/* ---------- Certificates ---------- */
.cert-filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 32px; }
.cert-filter {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  padding: 9px 18px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text-soft);
  cursor: pointer;
  transition: all 0.25s ease;
}
.cert-filter:hover { color: var(--text); border-color: var(--border-strong); }
.cert-filter.is-active { background: var(--grad); color: #06121e; border-color: transparent; }
[data-theme="light"] .cert-filter.is-active { color: #fff; }

.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.cert {
  display: flex; flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 22px 20px;
  backdrop-filter: blur(8px);
  position: relative;
  overflow: hidden;
  min-height: 148px;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}
.cert::after {
  content: "↗";
  position: absolute; top: 16px; right: 18px;
  color: var(--text-muted);
  font-size: 1rem;
  transition: color 0.3s ease, transform 0.3s ease;
}
.cert:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: var(--glow); background: var(--card-hover); }
.cert:hover::after { color: var(--accent); transform: translate(2px, -2px); }
.cert__tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 12px;
}
.cert h3 { font-family: var(--font-display); font-weight: 600; font-size: 0.98rem; line-height: 1.3; margin-bottom: auto; padding-right: 14px; }
.cert__meta { margin-top: 12px; font-size: 0.78rem; color: var(--text-muted); }
.cert.is-hidden { display: none; }

/* ---------- Contact ---------- */
.section--contact { padding-bottom: 60px; }
.contact { position: relative; }
.contact__inner {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 56px clamp(26px, 5vw, 64px);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.contact__inner::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(60% 100% at 100% 0%, rgba(var(--accent-rgb), 0.12), transparent 60%);
  pointer-events: none;
}
.contact__lead { color: var(--text-soft); font-size: 1.08rem; max-width: 620px; margin: 18px 0 34px; }
.contact__cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-bottom: 30px; }
.contact-card {
  display: flex; align-items: center; gap: 16px;
  background: color-mix(in srgb, var(--bg-2) 60%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  color: var(--text);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
a.contact-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--glow); }
.contact-card svg { color: var(--accent); flex: none; }
.contact-card__label { display: block; font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-muted); }
.contact-card__value { display: block; font-family: var(--font-display); font-weight: 500; font-size: 1rem; }
.contact__socials { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); margin-top: 40px; }
.footer__inner { max-width: var(--maxw); margin: 0 auto; padding: 40px 26px; text-align: center; }
.footer__brand { font-family: var(--font-display); font-weight: 600; font-size: 1.2rem; }
.footer__note { color: var(--text-soft); font-size: 0.92rem; margin: 6px 0 12px; }
.footer__copy { color: var(--text-muted); font-size: 0.78rem; letter-spacing: 0.03em; }

/* ---------- Back to top ---------- */
.to-top {
  position: fixed;
  bottom: 26px; right: 26px;
  width: 48px; height: 48px;
  border-radius: 50%;
  display: grid; place-items: center;
  background: var(--grad);
  color: #06121e;
  border: none;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px) scale(0.8);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 12px 30px -10px rgba(var(--accent-rgb), 0.7);
  z-index: 90;
}
[data-theme="light"] .to-top { color: #fff; }
.to-top.is-visible { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.to-top:hover { transform: translateY(-4px) scale(1.05); }

/* ---------- Reveal animation ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(.2,.7,.2,1), transform 0.7s cubic-bezier(.2,.7,.2,1);
  will-change: opacity, transform;
}
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

/* ---------- Keyframes ---------- */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%,100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.5); opacity: 0.6; } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes scrollDot { 0% { opacity: 0; transform: translateY(-4px); } 40% { opacity: 1; } 80%,100% { opacity: 0; transform: translateY(8px); } }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; gap: 40px; }
  .hero__portrait { order: -1; }
  .portrait { width: min(280px, 70vw); }
  .about, .teaching { grid-template-columns: 1fr; gap: 34px; }
  .timeline-wrap { grid-template-columns: 1fr; gap: 40px; }
  .research-grid, .skills-grid, .grant-grid, .course-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .honors-grid { grid-template-columns: 1fr; }

  .nav__links {
    position: fixed;
    top: 0; right: 0;
    height: 100vh;
    width: min(300px, 80vw);
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    padding: 40px;
    background: var(--panel-solid);
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(.5,.15,.2,1);
    box-shadow: -20px 0 60px -20px rgba(0,0,0,0.6);
  }
  .nav__links.is-open { transform: translateX(0); }
  .nav__links a { font-size: 1.1rem; }
  .nav__burger { display: flex; }
  .theme-toggle__label { display: none; }
}

@media (max-width: 560px) {
  .section { padding: 72px 20px; }
  .hero { padding: 110px 20px 70px; }
  .research-grid, .skills-grid, .grant-grid, .about__stats, .contact__cards, .teaching__mentorstats, .course-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr; }
  .pub { grid-template-columns: 1fr; gap: 10px; }
  .pub__year { border-right: none; border-bottom: 1px solid var(--border); padding-bottom: 8px; }
  .portrait__badge--1 { left: -10px; }
  .portrait__badge--2 { right: -10px; }
  .nav__brand-text { display: none; }
}

/* =========================================================
   Enhancements — aurora orbs, colorful socials, ML card,
   rotating headline, extra motion
   ========================================================= */

/* ---------- Drifting aurora orbs ---------- */
.orbs { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(48px);
  opacity: 0.5;
  mix-blend-mode: screen;
  will-change: transform;
}
[data-theme="light"] .orb { opacity: 0.38; mix-blend-mode: multiply; filter: blur(52px); }
.orb--1 { width: 30vw; height: 30vw; left: -8vw; top: -6vw; background: radial-gradient(circle, rgba(var(--accent-rgb),0.8), transparent 70%); animation: drift1 26s ease-in-out infinite; }
.orb--2 { width: 27vw; height: 27vw; right: -8vw; top: 22vh; background: radial-gradient(circle, rgba(var(--accent-2-rgb),0.7), transparent 70%); animation: drift2 32s ease-in-out infinite; }
.orb--3 { width: 26vw; height: 26vw; left: 32vw; bottom: -12vw; background: radial-gradient(circle, rgba(167,139,250,0.55), transparent 70%); animation: drift3 30s ease-in-out infinite; }
[data-theme="light"] .orb--3 { background: radial-gradient(circle, rgba(176,132,47,0.5), transparent 70%); }

@keyframes drift1 { 0%,100% { transform: translate(0,0) scale(1); } 33% { transform: translate(12vw,8vh) scale(1.15); } 66% { transform: translate(6vw,-6vh) scale(0.95); } }
@keyframes drift2 { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(-14vw,10vh) scale(1.2); } }
@keyframes drift3 { 0%,100% { transform: translate(0,0) scale(1); } 40% { transform: translate(-8vw,-10vh) scale(1.1); } 75% { transform: translate(10vw,-4vh) scale(0.9); } }

/* animate the gradient text so it shimmers */
.grad-text { background-size: 200% auto; animation: gradShift 6s ease infinite; }
@keyframes gradShift { 0%,100% { background-position: 0% center; } 50% { background-position: 100% center; } }

/* ---------- Clickable eyebrow ---------- */
.eyebrow--link { transition: border-color 0.3s ease, color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease; }
.eyebrow--link svg { opacity: 0.6; transition: transform 0.3s ease, opacity 0.3s ease; }
.eyebrow--link:hover { border-color: var(--accent); color: var(--text); transform: translateY(-2px); box-shadow: var(--glow); }
.eyebrow--link:hover svg { opacity: 1; transform: translate(2px,-2px); }

/* ---------- Rotating headline word ---------- */
.rotator { color: var(--accent); font-weight: 600; display: inline-block; position: relative; }
.rotator::after { content: ""; }
.rotator.swap { animation: rotSwap 0.5s ease; }
@keyframes rotSwap { 0% { opacity: 0; transform: translateY(10px); filter: blur(4px); } 100% { opacity: 1; transform: translateY(0); filter: blur(0); } }

/* ---------- Colorful social icons (hero) ---------- */
.hero__socials { flex-wrap: wrap; }
.s-icon {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.s-icon::before {
  content: "";
  position: absolute; inset: 0;
  background: var(--brand, var(--accent));
  transform: translateY(102%);
  transition: transform 0.32s cubic-bezier(.5,.15,.2,1);
  z-index: -1;
}
.s-icon:hover { color: #fff; border-color: transparent; transform: translateY(-5px); box-shadow: 0 12px 26px -10px var(--brand, var(--accent)); }
.s-icon:hover::before { transform: translateY(0); }

/* brand colors (shared by icon + pill buttons) */
.social--email    { --brand: #ea4335; }
.social--scholar  { --brand: #4285f4; }
.social--rg       { --brand: #00d0af; }
.social--orcid    { --brand: #a6ce39; }
.social--linkedin { --brand: #0a66c2; }
.social--github   { --brand: #6e5494; }
.social--facebook { --brand: #1877f2; }
.social--x        { --brand: #111827; }
[data-theme="light"] .social--x { --brand: #000000; }
.social--du       { --brand: #0b6b3a; }

/* ---------- Colorful social pill buttons (contact) ---------- */
.social-buttons { display: flex; flex-wrap: wrap; gap: 12px; }
.sbtn {
  position: relative;
  display: inline-flex; align-items: center; gap: 9px;
  padding: 11px 18px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text);
  background: color-mix(in srgb, var(--bg-2) 55%, transparent);
  border: 1px solid var(--border);
  overflow: hidden;
  isolation: isolate;
  transition: transform 0.28s cubic-bezier(.5,.15,.2,1), color 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
}
.sbtn svg { position: relative; z-index: 1; transition: transform 0.28s ease; }
.sbtn::before {
  content: "";
  position: absolute; inset: 0;
  background: var(--brand, var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.34s cubic-bezier(.5,.15,.2,1);
  z-index: 0;
}
.sbtn > span { position: relative; z-index: 1; }
.sbtn:hover { color: #fff; border-color: transparent; transform: translateY(-4px); box-shadow: 0 14px 30px -12px var(--brand, var(--accent)); }
.sbtn:hover::before { transform: scaleX(1); }
.sbtn:hover svg { transform: scale(1.15) rotate(-4deg); }
.sbtn--cv { --brand: linear-gradient(120deg, var(--accent), var(--accent-2)); }
.sbtn--cv::before { background: var(--grad); }
.sbtn--cv:hover { box-shadow: 0 14px 30px -12px rgba(var(--accent-rgb),0.7); }

/* ---------- Featured ML research card ---------- */
.rcard--feature {
  grid-column: span 2;
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  background:
    radial-gradient(120% 140% at 0% 0%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 55%),
    var(--panel);
}
.rcard--feature::after {
  content: "";
  position: absolute;
  top: -50%; left: -30%;
  width: 60%; height: 200%;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--accent) 22%, transparent), transparent);
  transform: rotate(18deg);
  animation: sheen 6.5s ease-in-out infinite;
  pointer-events: none;
}
@keyframes sheen { 0%, 65% { left: -40%; } 100% { left: 130%; } }
.rcard--feature h3 { font-size: 1.34rem; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; background-size: 200% auto; animation: gradShift 6s ease infinite; }
.rcard--feature .rcard__icon { color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 14%, transparent); }
.rcard__flag {
  position: absolute; top: 18px; right: 18px;
  font-size: 0.64rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent-2);
  padding: 4px 10px; border-radius: 999px;
  background: color-mix(in srgb, var(--accent-2) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-2) 40%, transparent);
}

/* pulse ring on portrait glow */
.portrait__frame { animation: portraitGlow 5s ease-in-out infinite; }
@keyframes portraitGlow { 0%,100% { box-shadow: var(--shadow); } 50% { box-shadow: var(--shadow), 0 0 42px -6px rgba(var(--accent-rgb),0.5); } }

@media (max-width: 900px) {
  .rcard--feature { grid-column: span 2; }
}
@media (max-width: 560px) {
  .rcard--feature { grid-column: auto; }
  .social-buttons { gap: 9px; }
  .sbtn { padding: 10px 14px; font-size: 0.84rem; }
}

/* =========================================================
   Beauty pass 2 — hero entrance, benzene decor, spotlight,
   underline draws, tag pops, tilt, footer shimmer
   ========================================================= */

/* ---------- Hero title word entrance ---------- */
.hero__title .w { display: inline-block; animation: wordRise 0.9s cubic-bezier(.2,.7,.2,1) both; }
.hero__title .w:nth-child(1) { animation-delay: 0.05s; }
.hero__title .w:nth-child(2) { animation-delay: 0.16s; }
.hero__title .w:nth-child(3) { animation-delay: 0.27s; }
.hero__title .w:nth-child(4) { animation-delay: 0.42s; }
@keyframes wordRise {
  from { opacity: 0; transform: translateY(42px) rotate(1.5deg); filter: blur(6px); }
  to   { opacity: 1; transform: translateY(0) rotate(0);        filter: blur(0); }
}

/* ---------- Floating benzene rings ---------- */
.hero__deco { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.hex { position: absolute; }
.hex polygon, .hex circle { fill: none; stroke: currentColor; stroke-width: 2; }
.hex--1 { width: 150px; height: 150px; top: 13%; right: 5%; color: var(--accent); opacity: 0.13; animation: hexDrift 24s ease-in-out infinite; }
.hex--2 { width: 84px; height: 84px; bottom: 15%; left: 3%; color: var(--accent-2); opacity: 0.12; animation: hexDrift 30s ease-in-out infinite reverse; }
.hex--3 { width: 56px; height: 56px; top: 64%; right: 22%; color: var(--accent-3); opacity: 0.1; animation: hexDrift 20s ease-in-out infinite; }
@keyframes hexDrift {
  0%   { transform: translateY(0) rotate(0deg); }
  50%  { transform: translateY(-26px) rotate(180deg); }
  100% { transform: translateY(0) rotate(360deg); }
}

/* ---------- Section heading underline draw ---------- */
.section__head::after {
  content: "";
  display: block;
  width: 76px; height: 3px;
  margin-top: 20px;
  border-radius: 3px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.9s 0.25s cubic-bezier(.2,.7,.2,1);
}
.section__head.is-visible::after { transform: scaleX(1); }

/* ---------- Cursor spotlight on cards ---------- */
.has-spot { position: relative; }
.spot {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
  background: radial-gradient(360px circle at var(--mx, 50%) var(--my, 50%),
    color-mix(in srgb, var(--accent) 13%, transparent), transparent 45%);
}
.has-spot:hover .spot { opacity: 1; }

/* ---------- Portrait 3D tilt ---------- */
.portrait__frame { transition: transform 0.2s ease-out; will-change: transform; }

/* ---------- Timeline: live dot + hover accent ---------- */
.tl-item__title { transition: color 0.3s ease; }
.tl-item:hover .tl-item__title { color: var(--accent); }
.timeline .tl-item:first-of-type .tl-item__dot::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--accent);
  animation: ping 2.6s cubic-bezier(0, 0, 0.2, 1) infinite;
}
@keyframes ping { 0% { transform: scale(1); opacity: 0.65; } 75%, 100% { transform: scale(2.8); opacity: 0; } }

/* ---------- Skill tag stagger pop ---------- */
.skillcard.is-visible .tags span { animation: tagPop 0.5s cubic-bezier(.2,.7,.2,1) both; }
.skillcard.is-visible .tags span:nth-child(1) { animation-delay: 0.12s; }
.skillcard.is-visible .tags span:nth-child(2) { animation-delay: 0.17s; }
.skillcard.is-visible .tags span:nth-child(3) { animation-delay: 0.22s; }
.skillcard.is-visible .tags span:nth-child(4) { animation-delay: 0.27s; }
.skillcard.is-visible .tags span:nth-child(5) { animation-delay: 0.32s; }
.skillcard.is-visible .tags span:nth-child(6) { animation-delay: 0.37s; }
.skillcard.is-visible .tags span:nth-child(7) { animation-delay: 0.42s; }
.skillcard.is-visible .tags span:nth-child(8) { animation-delay: 0.47s; }
.skillcard.is-visible .tags span:nth-child(9) { animation-delay: 0.52s; }
@keyframes tagPop { from { opacity: 0; transform: translateY(10px) scale(0.85); } to { opacity: 1; transform: translateY(0) scale(1); } }

/* ---------- Footer shimmer line ---------- */
.footer { border-top: none; position: relative; }
.footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad);
  background-size: 200% auto;
  animation: gradShift 5s linear infinite;
  opacity: 0.8;
}

/* ---------- Decorative quote mark ---------- */
.teaching__philosophy blockquote { position: relative; }
.teaching__philosophy blockquote::before {
  content: "\201C";
  position: absolute;
  top: -0.52em; left: 14px;
  font-family: var(--font-display);
  font-size: 4.4rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.28;
  pointer-events: none;
}

/* =========================================================
   Beauty pass 3 — publications & conference presentations
   ========================================================= */

/* ghost issue numbers 01–06 */
.pub { counter-increment: pub; overflow: hidden; grid-template-columns: 100px 1fr; }
.pub::before {
  content: counter(pub, decimal-leading-zero);
  position: absolute;
  top: 4px; right: 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 3.4rem;
  line-height: 1;
  color: color-mix(in srgb, var(--text) 7%, transparent);
  pointer-events: none;
  transition: color 0.45s ease, transform 0.45s ease;
}
.pub:hover::before {
  color: color-mix(in srgb, var(--accent) 30%, transparent);
  transform: translateY(-4px) scale(1.06);
}

/* gradient spine that draws in on hover */
.pub::after {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--grad);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.45s cubic-bezier(.2,.7,.2,1);
}
.pub:hover::after { transform: scaleY(1); }

/* year as a gradient-tinted pill */
.pub__year {
  border-right: none;
  border-bottom: none;
  align-self: start;
  justify-self: start;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 11%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  transition: background 0.35s ease, color 0.35s ease, box-shadow 0.35s ease;
}
.pub:hover .pub__year {
  background: var(--accent);
  color: var(--bg);
  box-shadow: 0 8px 20px -8px var(--accent);
}

/* title, journal, and author accents */
.pub__title { transition: color 0.35s ease; padding-right: 56px; }
.pub:hover .pub__title { color: var(--accent); }
.pub__venue em { color: var(--accent-2); transition: color 0.3s ease; }
.pub__authors .me {
  padding: 1px 8px;
  border-radius: 7px;
  background: color-mix(in srgb, var(--accent-2) 13%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-2) 30%, transparent);
  white-space: nowrap;
}

/* conference presentations */
.conf { transition: border-color 0.35s ease, box-shadow 0.35s ease; }
.conf:hover { border-color: var(--border-strong); box-shadow: var(--shadow); }
.conf__list li {
  position: relative;
  padding: 15px 16px 15px 44px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}
.conf__list li::before {
  content: "";
  position: absolute;
  left: 16px; top: 21px;
  width: 0; height: 0;
  border-left: 11px solid var(--accent);
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-radius: 2px;
  transition: transform 0.3s ease, filter 0.3s ease;
}
.conf__list li:hover {
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  border-color: var(--border);
  transform: translateX(6px);
}
.conf__list li:hover::before {
  transform: scale(1.25);
  filter: drop-shadow(0 0 6px color-mix(in srgb, var(--accent) 60%, transparent));
}
.conf__list strong { transition: color 0.3s ease; }
.conf__list li:hover strong { color: var(--accent); }

@media (max-width: 560px) {
  .pub { grid-template-columns: 1fr; }
  .pub::before { font-size: 2.5rem; top: auto; bottom: 8px; }
  .pub__title { padding-right: 0; }
}

/* ---------- Corresponding-author marker ---------- */
.pub__authors .me sup {
  font-size: 0.72em;
  font-weight: 700;
  color: var(--accent-3);
  margin-left: 1px;
}

.badge--corr {
  background: color-mix(in srgb, var(--accent-3) 14%, transparent);
  color: var(--accent-3);
  border: 1px solid color-mix(in srgb, var(--accent-3) 42%, transparent);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  transition: background 0.35s ease, color 0.35s ease, box-shadow 0.35s ease;
}
.badge--corr::before { content: "\2217"; margin-right: 5px; font-weight: 700; }
.badge--corr::after {
  content: "";
  position: absolute;
  top: 0; left: -60%;
  width: 45%; height: 100%;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--accent-3) 45%, transparent), transparent);
  transform: skewX(-20deg);
  transition: left 0.55s ease;
}
.pub:hover .badge--corr {
  background: color-mix(in srgb, var(--accent-3) 24%, transparent);
  box-shadow: 0 6px 16px -8px var(--accent-3);
}
.pub:hover .badge--corr::after { left: 115%; }

/* ---------- DOI link ---------- */
.pub__doi {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  padding: 3px 9px;
  margin-left: 4px;
  border-radius: 6px;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 34%, transparent);
  transition: background 0.3s ease, color 0.3s ease, transform 0.3s ease;
}
.pub__doi::after { content: "\2197"; }
.pub__doi:hover {
  background: var(--accent);
  color: var(--bg);
  transform: translateY(-2px);
}

/* ---------- Clickable publication cards ---------- */
.pub { position: relative; cursor: pointer; }
.pub__link { color: inherit; text-decoration: none; }
/* stretch the title link so the whole card opens the paper */
.pub__link::after { content: ""; position: absolute; inset: 0; z-index: 1; border-radius: inherit; }
.pub__link:focus-visible { outline: none; }
.pub:focus-within { outline: 2px solid var(--accent); outline-offset: 3px; }
/* keep the DOI button and badges independently clickable/hoverable above the overlay */
.pub__doi, .pub .badge { position: relative; z-index: 2; }
.pub__go {
  display: inline-block;
  margin-left: 6px;
  font-size: 0.85em;
  color: var(--accent);
  opacity: 0;
  transform: translate(-6px, 4px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.pub:hover .pub__go, .pub:focus-within .pub__go { opacity: 1; transform: translate(0, 0); }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.2s !important; scroll-behavior: auto !important; }
  [data-reveal] { opacity: 1; transform: none; }
  .molecular-canvas { display: none; }
  .orbs { display: none; }
  .rcard--feature::after { display: none; }
  .hex { display: none; }
  .spot { display: none; }
}