/* ============================================================
   Raymond Yu — research page
   Grotesk + ink blue
   ============================================================ */

:root {
  --bg:      #f8f9fa;
  --card:    #ffffff;
  --ink:     #16181d;
  --body:    #3c4048;
  --muted:   #8a8f98;
  --line:    #e7e9ed;
  --accent:  #2f4b8f;
  --accent-hover: #3a5aa8;
  --display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --sans:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: #eaedf4;
  color: var(--body);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ---------- Animated textured background ---------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.bg span {
  position: absolute;
  inset: -25%;
  display: block;
  will-change: transform;
}

/* soft drifting color */
.bg-aurora {
  background:
    radial-gradient(38% 38% at 22% 28%, rgba(47, 75, 143, 0.32), transparent 70%),
    radial-gradient(34% 34% at 82% 22%, rgba(74, 134, 196, 0.28), transparent 70%);
  filter: blur(65px);
  animation: drift-a 32s ease-in-out infinite alternate;
}
.bg-aurora.alt {
  background:
    radial-gradient(40% 40% at 72% 78%, rgba(108, 86, 168, 0.26), transparent 70%),
    radial-gradient(32% 32% at 24% 84%, rgba(56, 162, 152, 0.22), transparent 70%);
  filter: blur(70px);
  animation: drift-b 44s ease-in-out infinite alternate;
}

/* interactive flow field (dots + arrows) */
.bg-field {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

@keyframes drift-a {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(3%, -4%, 0) scale(1.12); }
}
@keyframes drift-b {
  0%   { transform: translate3d(0, 0, 0) scale(1.05); }
  100% { transform: translate3d(-4%, 3%, 0) scale(1); }
}

a { color: var(--accent); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent-hover); }

p { margin: 0 0 1rem; }
strong { font-weight: 600; color: var(--ink); }

/* ---------- Layout ---------- */
.wrap {
  max-width: 720px;
  margin: 44px auto;
  padding: 4px 52px 60px;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(28, 38, 80, 0.12), 0 2px 10px rgba(28, 38, 80, 0.05);
}

/* ---------- Entrance ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: none; }
}
.intro, section, footer {
  animation: fadeUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.intro { animation-delay: 0.02s; }
#bio   { animation-delay: 0.10s; }
#news  { animation-delay: 0.18s; }
#publications { animation-delay: 0.26s; }
footer { animation-delay: 0.32s; }

@media (prefers-reduced-motion: reduce) {
  .bg span { animation: none; }
  .intro, section, footer { animation: none; }
}

section {
  padding: 40px 0;
  border-top: 1px solid var(--line);
}
#bio { border-top: none; }

h2 {
  font-family: var(--display);
  font-size: 0.74rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin: 0 0 28px;
}

/* ---------- Header ---------- */
.intro {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 52px 0 16px;
}
.avatar {
  width: 150px;
  height: 150px;
  object-fit: cover;
  border-radius: 16px;
  flex-shrink: 0;
  box-shadow: 0 6px 24px rgba(22, 30, 60, 0.12);
  position: relative;
  top: 12px;
}
.intro-text h1 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 2.9rem;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 6px;
}
.tagline {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.15rem;
  color: var(--accent);
  margin: 0 0 8px;
}
.affil {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0 0 14px;
  line-height: 1.5;
}
.affil a { color: var(--body); border-bottom: 1px solid var(--line); }
.affil a:hover { color: var(--accent); border-color: var(--accent); }

.socials { font-size: 0.92rem; font-weight: 500; }
.socials a { color: var(--body); }
.socials a:hover { color: var(--accent); }
.socials .dot { color: var(--line); margin: 0 8px; }

/* ---------- Bio ---------- */
.lede {
  font-size: 1.16rem;
  line-height: 1.62;
  color: var(--ink);
}
#bio { padding-top: 44px; }
#bio a, .lede a { border-bottom: 1px solid rgba(47,75,143,0.28); }
#bio a:hover, .lede a:hover { border-color: var(--accent); }

.highlight {
  margin: 18px 0 0;
  padding: 11px 18px;
  font-size: 0.95rem;
  line-height: 1.55;
  font-weight: 600;
  color: var(--accent);
  background: rgba(47, 75, 143, 0.07);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
}

/* ---------- News ---------- */
.news { list-style: none; margin: 0; padding: 0; }
.news li {
  display: flex;
  gap: 20px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.98rem;
}
.news li:last-child { border-bottom: none; }
.news .date {
  flex-shrink: 0;
  width: 76px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
  font-weight: 500;
  padding-top: 3px;
}
.award { color: var(--accent); font-weight: 600; }

/* ---------- Publications ---------- */
.pub {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  margin: 0 -16px;
  padding: 22px 16px;
  border-radius: 14px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}
.pub + .pub { border-top: 1px solid var(--line); }
.pub:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 14px 30px rgba(28, 38, 80, 0.09);
}

.pub-media {
  flex: 0 0 200px;
  display: block;
  border-radius: 10px;
  overflow: hidden;
  background: #eef0f3;
  box-shadow: 0 2px 12px rgba(22, 30, 60, 0.08);
  aspect-ratio: 16 / 10;
}
.pub-media img,
.pub-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .4s ease;
}
.pub-media:hover img,
.pub-media:hover video { transform: scale(1.04); }

.pub-text { flex: 1; min-width: 0; }
.pub-text h3 {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.24rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}
.pub-text h3 a { color: var(--ink); }
.pub-text h3 a:hover { color: var(--accent); }

.authors { margin: 0 0 3px; font-size: 0.92rem; color: var(--body); line-height: 1.5; }
.venue { margin: 0 0 10px; font-size: 0.9rem; color: var(--muted); }
.eq { color: var(--accent); font-weight: 600; }
.pub-note {
  margin: -16px 0 24px;
  font-size: 0.82rem;
  color: var(--muted);
}

.pub-links { margin: 0; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.pub-links a {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--accent);
  padding: 3px 13px;
  border: 1px solid rgba(47,75,143,0.32);
  border-radius: 999px;
  transition: all .15s ease;
}
.pub-links a:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.pub-links .soon {
  font-size: 0.8rem;
  color: var(--muted);
  padding: 3px 13px;
  border: 1px dashed var(--line);
  border-radius: 999px;
}

/* ---------- Footer ---------- */
footer {
  padding-top: 44px;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}
footer p { margin: 0; }
.updated { margin-top: 4px; font-size: 0.78rem; opacity: 0.8; }

/* invisible visit tracker (kept in the DOM so it still loads + counts) */
.tracker {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
  left: -9999px;
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  body { font-size: 16px; }
  .wrap {
    margin: 0;
    border-radius: 0;
    border: none;
    padding: 4px 22px 56px;
  }
  .pub { margin: 0; padding: 20px 0; }
  .intro {
    flex-direction: column;
    text-align: center;
    gap: 20px;
    padding: 48px 0 8px;
  }
  .socials { line-height: 2; }
  .intro-text h1 { font-size: 2.4rem; }
  .pub { flex-direction: column; gap: 14px; }
  .pub-media { flex-basis: auto; width: 100%; max-width: 320px; }
  .news li { gap: 14px; }
  .news .date { width: 64px; }
}