/* ─── 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; }

/* ─── Dark mode variables ───────────────────────────────────────── */
[data-theme="dark"] {
  --bg:     #1a1816;
  --text:   #e6e1d8;
  --muted:  #918d87;
  --link:   #aaa59f;
  --border: #2e2b26;
}

/* ─── Theme toggle button ───────────────────────────────────────── */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
  color: var(--muted);
  display: flex;
  align-items: center;
  border-radius: 6px;
  transition: background 0.15s, color 0.15s;
  line-height: 0;
}
.theme-toggle:hover { background: rgba(0,0,0,0.07); color: var(--text); }
[data-theme="dark"] .theme-toggle:hover { background: rgba(255,255,255,0.08); }
.theme-toggle svg { width: 17px; height: 17px; }
.icon-sun  { display: none; }
.icon-moon { display: block; }
[data-theme="dark"] .icon-sun  { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "DM Sans", -apple-system, BlinkMacSystemFont, 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: "DM Serif Display", Georgia, serif;
  font-size: 1.35rem;
  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;
}

.photo-frame { display: contents; }

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

.timeline {
  margin-top: 14px;
  padding-left: 6px;
}

.tl-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  position: relative;
  padding-bottom: 12px;
}

.tl-item::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: var(--border);
}

.tl-item--last::before { display: none; }

.tl-dot {
  flex-shrink: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #b89a60;
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px #b89a60;
  margin-top: 3px;
  position: relative;
  z-index: 1;
}

.tl-content {
  font-size: 0.76rem;
  color: #555;
  line-height: 1.5;
}

.tl-year {
  font-weight: 500;
  color: var(--text);
}

.editorial-list {
  list-style: none;
  margin-top: 10px;
  padding: 0;
  font-size: 0.74rem;
  color: #666;
  line-height: 2;
}

.ed-role {
  font-weight: 500;
  color: var(--text);
}

.sidebar-rule {
  border: none;
  border-top: 1px solid var(--border);
  margin: 10px 0 0;
}

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

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

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

.seeking-callout {
  font-size: 0.95rem;
  color: var(--text);
  background: #e9e0cc;
  border-left: 3px solid #b89a60;
  padding: 8px 12px;
  border-radius: 0 4px 4px 0;
  margin-bottom: 16px;
}

.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: "DM Serif Display", 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: "DM Sans", 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 18px; }
  main { padding: 0 18px 60px; }

  /* Stack layout vertically */
  .home-layout { flex-direction: column; gap: 20px; }

  /* Sidebar: photo left half, info right half */
  .home-sidebar { display: flex; flex-direction: row; gap: 0; align-items: stretch; }
  .photo-frame { width: 50%; flex-shrink: 0; display: flex; align-items: center; justify-content: center; }
  .home-sidebar img { width: 80%; height: auto; object-fit: cover; object-position: center top; border-radius: 4px; }
  .sidebar-info { width: 50%; padding-left: 14px; box-sizing: border-box; }

  /* Tighten timeline on mobile */
  .timeline { margin-top: 4px; }
  .tl-item { padding-bottom: 8px; }
  .tl-content { font-size: 0.72rem; }
  .editorial-list { font-size: 0.72rem; line-height: 1.8; }
  .sidebar-rule { margin: 8px 0 0; }

  /* Fix overflow */
  .home-main { overflow: hidden; width: 100%; }
  .seeking-callout { box-sizing: border-box; width: 100%; }
  .hero-bio p { overflow-wrap: break-word; word-break: break-word; }

  /* Tighten paper cards */
  .deck-stage { padding: 40px 0 36px; }
  .paper-card { width: 120px; margin-left: -52px; }

  /* Fade cards at both edges */
  .deck-stage {
    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
    mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
  }
}

/* ─── Dark mode overrides (hardcoded colors) ────────────────────── */
[data-theme="dark"] .seeking-callout {
  background: #2a2520;
  border-left-color: #b89a60;
}
[data-theme="dark"] .tl-content { color: var(--muted); }
[data-theme="dark"] .paper-card {
  background: #252220;
  box-shadow: 3px 6px 18px rgba(0,0,0,0.5), 0 0 0 2.5px #555;
}
[data-theme="dark"] .paper-card-inner { border-bottom-color: #3a3630; }
[data-theme="dark"] .paper-card.active {
  box-shadow: 0 8px 24px rgba(0,0,0,0.5), 0 0 0 2.5px #c8940a;
}
[data-theme="dark"] .badge-nature  { background: #3a1200; color: #ff9060; }
[data-theme="dark"] .badge-acl     { background: #0a2a10; color: #60d870; }
[data-theme="dark"] .badge-neurips { background: #1a0a30; color: #bf80ff; }
[data-theme="dark"] .badge-bioinf  { background: #001828; color: #50b8ff; }
[data-theme="dark"] .badge-arxiv   { background: #282828; color: #bbbbbb; }
[data-theme="dark"] .badge-default { background: #182030; color: #7a9fd4; }
[data-theme="dark"] .cite-high     { color: #ffaa50; }
[data-theme="dark"] a:hover        { color: #8ab4e8; }
[data-theme="dark"] .paper-card img { filter: invert(1) hue-rotate(180deg) !important; }