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

:root {
  --bg:        #f0ede6;
  --text:      #222222;
  --muted:     #666666;
  --link:      #888888;
  --border:    #d8d4cc;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: underline; transition: color 0.15s ease; }
a:hover { color: #7a9fd4; }
em { font-style: italic; }

/* ─── Navigation ───────────────────────────────────────────────── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

nav {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  max-width: 1020px;
  margin: 0 auto;
  padding: 18px 40px;
}

.site-name {
  font-family: Georgia, serif;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
}
.site-name:hover { color: var(--text); text-decoration: none; }

.nav-tabs { display: flex; gap: 28px; }

.tab-link {
  font-size: 0.88rem;
  color: var(--muted);
  text-decoration: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  padding-bottom: 1px;
}
.tab-link:hover { color: var(--text); text-decoration: none; }
.tab-link.active {
  color: var(--text);
  border-bottom-color: var(--text);
  text-decoration: none;
}

/* ─── Main & Tabs ──────────────────────────────────────────────── */
main {
  max-width: 1020px;
  margin: 0 auto;
  padding: 0 40px 80px;
}

.tab-panel { display: none; padding-top: 52px; }
.tab-panel.active { display: block; }

/* ─── Hero ─────────────────────────────────────────────────────── */
/* Two-column: photo left sidebar | bio + papers right column */
.home-layout {
  display: flex;
  gap: 56px;
  align-items: flex-start;
}

.home-sidebar {
  flex: 0 0 176px;
}

.home-sidebar img {
  width: 176px;
  height: 211px;
  object-fit: cover;
  object-position: center top;
  border-radius: 4px;
  display: block;
}

.home-main {
  flex: 1;
  min-width: 0;
}

.hero-bio p {
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.hero-bio a { text-decoration: underline; }

.ext-links {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 4px;
}
.ext-links a {
  color: var(--muted);
  text-decoration: none;
}
.ext-links a:hover { color: var(--link); text-decoration: underline; }

/* ─── Home: Paper Card Deck ────────────────────────────────────── */
.paper-deck {
  margin-top: 16px;
}

.deck-heading {
  font-family: Georgia, serif;
  font-size: 1.2rem;
  font-weight: normal;
  margin-bottom: 0;
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.deck-hint {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: normal;
}

/* Stage: the playing-card row */
.deck-stage {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  padding: 52px 0 48px;
  position: relative;
}

.paper-card {
  position: relative;
  width: 168px;
  flex-shrink: 0;
  margin-left: -72px;         /* overlap */
  cursor: pointer;
  transform: rotate(var(--rot, 0deg));
  transform-origin: bottom center;
  transition:
    transform 0.32s cubic-bezier(0.34, 1.45, 0.64, 1),
    filter     0.32s ease,
    z-index    0s;
  z-index: var(--i, 0);
}

.paper-card:first-child { margin-left: 0; }

/* Card image */
.paper-card img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: top;
  display: block;
  border-radius: 5px;
  box-shadow: 3px 6px 18px rgba(0, 0, 0, 0.22);
  filter: grayscale(1);
  transition: box-shadow 0.32s ease, filter 0.32s ease;
}

/* Hover: card pops up + color restored */
.paper-card:hover {
  transform: rotate(0deg) translateY(-52px) scale(1.08);
  z-index: 100;
  filter: drop-shadow(0 28px 36px rgba(0, 0, 0, 0.28));
}

.paper-card:hover img {
  filter: grayscale(0);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

/* Title label that fades in on hover */
.card-label {
  position: absolute;
  bottom: -26px;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  font-size: 0.75rem;
  color: var(--muted);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.paper-card:hover .card-label { opacity: 1; }

/* Second row: less top padding since row 1 already has spacing */
/* Subsequent rows: small gap between rows */
.deck-stage + .deck-stage {
  padding-top: 8px;
  margin-top: -16px;
}

/* Highlight: starred / featured papers */
.paper-card--highlight img {
  box-shadow: 3px 6px 18px rgba(0, 0, 0, 0.22), 0 0 0 2.5px #999;
}

.paper-card--highlight::after {
  content: "★";
  position: absolute;
  top: -9px;
  right: -6px;
  font-size: 0.85rem;
  color: #999;
  background: var(--bg);
  border-radius: 50%;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
  z-index: 1;
  transition: color 0.32s ease;
}

.paper-card--highlight:hover::after {
  color: #c8940a;
}

.paper-card--highlight:hover img {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18), 0 0 0 2.5px #c8940a;
}

/* Placeholder for cards without a cover/PDF yet */
.card-placeholder {
  width: 100%;
  aspect-ratio: 3 / 4;
  background: var(--border);
  border-radius: 5px;
  box-shadow: 3px 6px 18px rgba(0, 0, 0, 0.22);
  transition: box-shadow 0.32s ease;
}

.paper-card--no-pdf {
  cursor: default;
  opacity: 0.55;
}

.deck-more {
  text-align: center;
  margin-top: 8px;
  font-size: 0.85rem;
}
.deck-more .tab-link {
  color: var(--link);
  border: none;
  padding: 0;
  text-decoration: underline;
  font-size: 0.85rem;
}

/* ─── PDF Modal ────────────────────────────────────────────────── */
.pdf-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 500;
  align-items: center;
  justify-content: center;
}

.pdf-modal.open { display: flex; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(20, 20, 20, 0.72);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal-box {
  position: relative;
  z-index: 1;
  width: min(900px, 92vw);
  height: 90vh;
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.4);
  animation: slideUp 0.25s cubic-bezier(0.34, 1.2, 0.64, 1);
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(32px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0)    scale(1);    }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid #e4e0d8;
  background: var(--bg);
  flex-shrink: 0;
}

.modal-title {
  font-size: 0.88rem;
  color: var(--muted);
  font-style: italic;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  color: var(--muted);
  padding: 0 4px;
  transition: color 0.15s;
}
.modal-close:hover { color: var(--text); }

#pdf-frame {
  flex: 1;
  width: 100%;
  border: none;
}

/* ─── Publications Tab ─────────────────────────────────────────── */
.tab-note {
  font-size: 0.83rem;
  color: var(--muted);
  margin-bottom: 36px;
}
.tab-note a { color: var(--muted); }
.tab-note a:hover { color: var(--link); }

.pub-year-section { margin-bottom: 40px; }

.pub-year-section h3 {
  font-family: Georgia, serif;
  font-size: 1.05rem;
  font-weight: normal;
  color: var(--muted);
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.pub-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.pub-item-star .pub-title { font-weight: 600; }

.pub-title {
  font-size: 0.92rem;
  margin-bottom: 4px;
  line-height: 1.45;
}
.pub-title a { color: var(--text); text-decoration: none; }
.pub-title a:hover { color: var(--link); text-decoration: underline; }

.pub-authors {
  font-size: 0.81rem;
  color: var(--muted);
  margin-bottom: 6px;
  line-height: 1.5;
}
.pub-authors strong { color: var(--text); font-weight: 600; }

.pub-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* Badges */
.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 3px;
  letter-spacing: 0.01em;
}
.badge-nature  { background: #fff0e8; color: #8a3500; }
.badge-acl     { background: #e8f5e9; color: #1b5e20; }
.badge-neurips { background: #f3e8ff; color: #4a0d8c; }
.badge-bioinf  { background: #e0f2fe; color: #01579b; }
.badge-arxiv   { background: #f0f0f0; color: #444; }
.badge-default { background: #eef0f5; color: #2c4a7c; }

.cite {
  font-size: 0.78rem;
  color: var(--muted);
}
.cite-high { color: #7c4000; font-weight: 600; }

.pub-link {
  font-size: 0.78rem;
  color: var(--link);
  text-decoration: none;
}
.pub-link:hover { text-decoration: underline; }

/* ─── News Tab ─────────────────────────────────────────────────── */
.news-list { max-width: 640px; }

.news-item {
  display: flex;
  gap: 20px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  align-items: baseline;
}
.news-item:first-child { border-top: 1px solid var(--border); }

.nd {
  flex-shrink: 0;
  width: 56px;
  font-size: 0.8rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ─── Service Tab ──────────────────────────────────────────────── */
.service-block { margin-bottom: 36px; }

.service-block h3 {
  font-family: Georgia, serif;
  font-size: 1.05rem;
  font-weight: normal;
  color: var(--muted);
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.service-list {
  list-style: none;
  font-size: 0.92rem;
}
.service-list li {
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
}

/* ─── Footer ───────────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 28px 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8rem;
  max-width: 1020px;
  margin: 0 auto;
}

/* ─── Responsive ───────────────────────────────────────────────── */
@media (max-width: 640px) {
  nav { padding: 14px 20px; flex-wrap: wrap; gap: 10px; }
  .nav-tabs { gap: 16px; }
  main { padding: 0 20px 60px; }
  .home-layout { flex-direction: column; gap: 20px; }
  .home-sidebar img { width: 112px; height: 134px; }
}