/* ============================================================
   Young-Seok Lee — Academic Portfolio
   Pure HTML/CSS/JS, GitHub Pages ready
   ============================================================ */

/* ---------- AI / non-JS fallback ----------
   Each page embeds a static, crawler-readable copy of its JSON-driven content
   in a `<div data-ai-fallback>` (generated by scripts/build-prerender.mjs).
   The inline <head> script sets `data-js` on <html> before the first paint, so
   JS visitors hide the fallback immediately (no flash, identical UI) while
   non-JS clients — AI crawlers, search bots — see it as ordinary HTML. */
html[data-js] [data-ai-fallback] { display: none !important; }

/* ---------- CSS Variables ---------- */
:root {
  /* Warm off-white (slight beige) instead of pure white — less glare. */
  --bg-primary: #F7F4EC;
  --bg-surface: #EFEBE0;
  --color-primary: #1E3A5F;
  --color-secondary: #64748B;
  --color-accent: #0EA5E9;
  --color-warm: #D97706;
  --text-primary: #1E293B;
  --text-secondary: #64748B;
  --border-color: #E2E8F0;

  --nav-height: 60px;
  --content-max: 720px;
  --radius-card: 12px;
  --radius-pill: 9999px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
}

[data-theme="dark"] {
  --bg-primary: #0F172A;
  --bg-surface: #1E293B;
  --color-primary: #93C5FD;
  --color-secondary: #94A3B8;
  --color-accent: #38BDF8;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --border-color: #334155;
  --color-warm: #FB923C;
}

/* ---------- View transition for theme toggle ---------- */
@supports (view-transition-name: root) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
    mix-blend-mode: normal;
  }
  ::view-transition-old(root) {
    z-index: 1;
  }
  ::view-transition-new(root) {
    z-index: 2;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em;
  line-height: 1.3;
  color: var(--text-primary);
}

p {
  margin: 0 0 1em;
  text-wrap: pretty;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent);
}

ul {
  margin: 0 0 1em;
  padding-left: 1.25em;
}

li {
  margin-bottom: 0.4em;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ---------- Top navigation ---------- */
.topnav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  /* Translucent frosted bar — unified opacity with the side menu panel. */
  background: color-mix(in srgb, var(--bg-primary) 35%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.topnav__brand {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.topnav__brand:hover {
  color: var(--text-primary);
}

.topnav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Desktop horizontal nav — hidden by default (mobile/tablet-portrait first).
   At >=900px (PC, tablet landscape), it appears as a horizontal link row
   and the hamburger/side-panel are hidden. */
.topnav__links {
  display: none;
}

@media (min-width: 900px) {
  .topnav__links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    /* Slight separator from the theme toggle button on the far right */
    margin-right: 0.5rem;
  }
  .topnav__links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 6px 2px;
    border-bottom: 2px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
    white-space: nowrap;
  }
  .topnav__links a:hover {
    color: var(--text-primary);
  }
  .topnav__links a.is-active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
  }
  /* Hide mobile-only hamburger button on desktop.
     !important defends against the .icon-btn { display: inline-flex } base rule
     which has the same specificity. */
  [data-menu-toggle] {
    display: none !important;
  }
  /* Hide the slide-in side panel (even when 'is-open' from a prior narrow state) */
  .menu-panel,
  .menu-overlay {
    display: none !important;
  }
}

.icon-btn {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.icon-btn:hover {
  background: var(--bg-surface);
  border-color: var(--border-color);
  color: var(--color-accent);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

/* show only the active theme icon */
.icon-btn .icon-sun { display: none; }
.icon-btn .icon-moon { display: block; }
[data-theme="dark"] .icon-btn .icon-sun { display: block; }
[data-theme="dark"] .icon-btn .icon-moon { display: none; }

/* ---------- Hamburger menu panel ---------- */
.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  z-index: 1100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.menu-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.menu-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 320px;
  max-width: 86vw;
  height: 100vh;
  /* Translucent frosted panel — unified opacity with the top nav bar (35%). */
  background: color-mix(in srgb, var(--bg-primary) 35%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-left: 1px solid var(--border-color);
  z-index: 1200;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
  box-shadow: -8px 0 32px rgba(15, 23, 42, 0.08);
}

.menu-panel.is-open {
  transform: translateX(0);
}

.menu-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem 0 1.5rem;
  height: var(--nav-height);
  border-bottom: 1px solid var(--border-color);
}

.menu-panel__title {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Identity block at top of menu */
.menu-panel__identity {
  padding: 1.5rem 1.5rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.menu-panel__name {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.menu-panel__role {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}

.menu-list {
  list-style: none;
  margin: 0;
  padding: 0.75rem 0;
  flex: 1;
}

.menu-list a {
  display: grid;
  grid-template-columns: 2.25rem 1fr auto;
  align-items: center;
  gap: 0.5rem;
  position: relative;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  border-left: 3px solid transparent;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, padding 0.2s ease;
}

.menu-list .menu-num {
  font-family: 'JetBrains Mono', 'SF Mono', ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  font-weight: 400;
  transition: color 0.2s ease;
}

.menu-list .menu-arrow {
  width: 14px;
  height: 14px;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  color: var(--color-accent);
  flex-shrink: 0;
}

.menu-list a:hover {
  background: var(--bg-surface);
  color: var(--color-accent);
  padding-left: 1.75rem;
}

.menu-list a:hover .menu-num {
  color: var(--color-accent);
}

.menu-list a:hover .menu-arrow {
  opacity: 1;
  transform: translateX(0);
}

.menu-list a.is-active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background: var(--bg-surface);
}

.menu-list a.is-active .menu-num {
  color: var(--color-primary);
}

.menu-panel__footer {
  padding: 1rem 1.5rem 1.25rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}

/* ---------- Main layout ---------- */
main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 6rem 1.5rem 4rem;
}

@media (min-width: 768px) {
  main {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.page-header {
  text-align: center;
  margin-bottom: 3rem;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.page-header__rule {
  width: 60px;
  height: 2px;
  background: var(--color-accent);
  margin: 0 auto;
  border: none;
}

section {
  margin-bottom: 4rem;
}

section h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

section h3 {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* ---------- Badges & pills ---------- */
.badge {
  display: inline-block;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  font-size: 0.875rem;
  color: var(--text-primary);
  margin: 2px 0;
}

.badge--keyword {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.badge--tag {
  font-size: 0.75rem;
  background: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
  padding: 2px 8px;
  margin-left: 4px;
}

.badge--review {
  font-size: 0.75rem;
  background: transparent;
  border-color: var(--color-secondary);
  color: var(--color-secondary);
  padding: 2px 8px;
  margin-left: 4px;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 1rem;
}

/* ---------- Home page ---------- */
.hero h1 {
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
  text-align: left;
  color: var(--text-primary);
}

.hero__subtitle {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  margin-bottom: 1.5rem;
}

.hero__bio p {
  color: var(--text-primary);
}

/* External-link arrow next to advisor / scholar links */
.ext-link-arrow {
  display: inline-block;
  width: 0.75em;
  height: 0.75em;
  margin-left: 2px;
  vertical-align: 1px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.7;
}

a:hover .ext-link-arrow {
  opacity: 1;
}

/* News list */
.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.news-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
  align-items: baseline;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed var(--border-color);
}

.news-item:last-child {
  border-bottom: none;
}

.news-item__date {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.news-item__body {
  color: var(--text-primary);
}

.news-item__body strong {
  font-weight: 500;
  color: var(--text-primary);
}

.show-more-btn {
  margin-top: 1rem;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.show-more-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* External links */
.ext-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

@media (max-width: 560px) {
  .ext-links {
    grid-template-columns: 1fr;
  }
}

.ext-links a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
  position: relative;
}

.ext-links a:hover {
  border-color: color-mix(in srgb, var(--color-accent) 60%, var(--border-color));
  color: var(--color-accent);
  transform: translateY(-1px);
}

.ext-links a::after {
  content: "";
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 12px;
  height: 12px;
  background: currentColor;
  opacity: 0.35;
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><path d='M7 17L17 7'/><path d='M9 7h8v8'/></svg>") center/contain no-repeat;
  mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><path d='M7 17L17 7'/><path d='M9 7h8v8'/></svg>") center/contain no-repeat;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.ext-links a:hover::after {
  opacity: 1;
  transform: translate(1px, -1px);
}

.ext-links svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--color-primary);
  transition: color 0.2s ease;
}

.ext-links a:hover svg {
  color: var(--color-accent);
}

@media (max-width: 480px) {
  .news-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}

/* ---------- Publication collapsible Abstract / Keywords ---------- */
.pub-extra {
  margin-top: 0.5rem;
}
.pub-extra summary {
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  user-select: none;
}
.pub-extra summary::-webkit-details-marker { display: none; }
.pub-extra summary::before {
  content: "\25B8";
  font-size: 0.7rem;
  transition: transform 0.15s ease;
}
.pub-extra[open] summary::before { transform: rotate(90deg); }
.pub-extra p {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* ---------- Education timeline ---------- */
.timeline {
  position: relative;
  padding-left: 2rem;
  list-style: none;
  margin: 0;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 0.5rem;
  left: 7px;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  top: 0.4rem;
  left: -2rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--color-primary);
  box-sizing: border-box;
}

.timeline-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.25rem 1.5rem;
  transition: border-color 0.2s ease;
}

.timeline-card:hover {
  border-color: color-mix(in srgb, var(--color-primary) 35%, var(--border-color));
}

.timeline-card__period {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.timeline-card__school {
  font-weight: 600;
  font-size: 1.0625rem;
  margin-bottom: 0.25rem;
}

.timeline-card__degree {
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.timeline-card__advisor {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-top: 0.2rem;
}

.timeline-card__advisor .adv-label {
  color: var(--text-secondary);
}

.timeline-card__advisor a {
  color: var(--color-primary);
  border-bottom: 1px solid color-mix(in srgb, var(--color-primary) 35%, transparent);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.timeline-card__advisor a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.timeline-card__loc {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: 0.9375rem;
  margin-left: 0.25rem;
}

.timeline-card__degree em {
  font-style: italic;
}

/* New education layout (matches reference screenshot) */
.edu-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.25rem 1.5rem;
  transition: border-color 0.2s ease;
}

.edu-card:hover {
  border-color: color-mix(in srgb, var(--color-primary) 35%, var(--border-color));
}

.edu-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.5rem;
  margin-bottom: 0.6rem;
  line-height: 1.5;
}

.edu-card__period {
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  font-size: 0.9375rem;
}

.edu-card__sep {
  color: var(--text-secondary);
}

.edu-card__school {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 1rem;
}

.edu-card__loc {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.edu-details {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.edu-details li {
  position: relative;
  padding-left: 1.1rem;
  margin: 0;
  color: var(--text-primary);
  font-size: 0.9375rem;
  line-height: 1.55;
}

.edu-details li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 1px;
  opacity: 0.7;
}

.edu-details em {
  font-style: italic;
  color: var(--text-primary);
}

.edu-details .adv-label {
  color: var(--text-secondary);
}

.edu-details a {
  color: var(--color-primary);
  border-bottom: 1px solid color-mix(in srgb, var(--color-primary) 35%, transparent);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.edu-details a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------- Publications ---------- */
.tab-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.tab-btn {
  flex-shrink: 0;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.tab-btn.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

[data-theme="dark"] .tab-btn.is-active {
  color: var(--bg-primary);
}

.tab-content {
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.pub-group {
  margin-bottom: 2.5rem;
}

.pub-group__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.pub-item {
  display: grid;
  grid-template-columns: 2.25rem 1fr;
  gap: 0.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 0.9rem 1.1rem;
  transition: border-color 0.2s ease;
}

.pub-item:hover {
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--border-color));
}

.pub-item__num {
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  font-size: 0.9375rem;
  padding-top: 0.05rem;
}

.pub-item__body {
  font-size: 0.9375rem;
  line-height: 1.6;
}

.pub-item__authors {
  color: var(--text-primary);
}

.pub-item__authors .me {
  font-weight: 600;
  color: var(--color-primary);
}

.pub-item__title {
  color: var(--text-primary);
}

.pub-item__venue {
  font-style: italic;
  color: var(--text-primary);
}

.pub-item__details {
  color: var(--text-secondary);
}

.pub-item__meta {
  color: var(--text-primary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.pub-item__meta--sub {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 0.1rem;
}

.pub-item__sep {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: 0.5rem 0;
  opacity: 0.7;
}

.pub-item__actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.pub-item__actions--notes + .pub-item__actions--buttons {
  margin-top: 0.4rem;
}

.pub-note {
  font-size: 0.8125rem;
  font-style: normal;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.4;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.pub-note--info {
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 14%, transparent);
}

.pub-note--award {
  color: var(--color-warm);
  background: color-mix(in srgb, var(--color-warm) 14%, transparent);
}

#tab-content[data-current-tab="international_conferences"] .pub-note--award::before,
#tab-content[data-current-tab="domestic_conferences"] .pub-note--award::before {
  content: '🏆';
  margin-right: 0.35rem;
  font-style: normal;
}

.pub-note__icon {
  margin-right: 0.35rem;
  font-style: normal;
}

.pub-note--honor {
  /* reserved */
}

.pub-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border: 1px solid;
  background: transparent;
  font-family: inherit;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
  line-height: 1.4;
}

.pub-btn:hover { transform: translateY(-1px); }

/* Sort bar (filter chips above tab content) */
.sort-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1.25rem;
  font-size: 0.875rem;
}

.sort-bar__label {
  color: var(--text-secondary);
  margin-right: 0.25rem;
}

.sort-btn {
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

.sort-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-primary);
}

.sort-btn.is-active {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

/* DOI = warm amber */
.pub-btn--doi {
  color: var(--color-warm);
  border-color: var(--color-warm);
}
.pub-btn--doi:hover {
  background: var(--color-warm);
  color: #fff;
}
[data-theme="dark"] .pub-btn--doi:hover { color: var(--bg-primary); }

/* BibTeX = darker text color (matches vol./no./pp.) */
.pub-btn--bib {
  color: var(--text-primary);
  border-color: var(--text-primary);
}
.pub-btn--bib:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

/* PDF = red */
.pub-btn--pdf {
  color: #DC2626;
  border-color: #DC2626;
}
.pub-btn--pdf:hover {
  background: #DC2626;
  color: #fff;
  border-color: #DC2626;
}
[data-theme="dark"] .pub-btn--pdf {
  color: #F87171;
  border-color: #F87171;
}
[data-theme="dark"] .pub-btn--pdf:hover {
  background: #F87171;
  color: var(--bg-primary);
  border-color: #F87171;
}

/* Sort-by filter row */
.pub-filter {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1.25rem;
  font-size: 0.875rem;
}
.pub-filter__label {
  color: var(--text-secondary);
}
.pub-filter__btn {
  appearance: none;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
}
.pub-filter__btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.pub-filter__btn.is-active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}
[data-theme="dark"] .pub-filter__btn.is-active { color: var(--bg-primary); }

/* Toast for BibTeX copy feedback */
.pub-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 1500;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.16);
}
.pub-toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.award-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.award-item {
  padding: 0 0 0 1.25rem;
  border-bottom: none;
  position: relative;
  list-style: none;
  font-size: 0.9375rem;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 0.1rem;
}

.award-item:last-child { margin-bottom: 0; }

.award-item::before {
  content: '\25AA';
  position: absolute;
  left: 0;
  top: 0.2rem;
  color: var(--text-secondary);
  font-size: 0.75rem;
}

.award-venue {
  color: var(--text-primary);
  font-style: normal;
}

.award-highlight {
  color: var(--color-warm);
  font-weight: 600;
  font-style: normal;
}

.award-role {
  text-decoration: underline;
  text-underline-offset: 2px;
  color: var(--text-primary);
}

.award-group {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1rem 1.25rem 1.1rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s ease;
}

.award-group:hover {
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--border-color));
}

.award-group:last-child {
  margin-bottom: 0;
}

.award-group__title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: 0.01em;
}

.award-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.patent-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.patent-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 0.9rem 1.1rem;
  margin-bottom: 0.6rem;
  transition: border-color 0.2s ease;
}

.patent-item:hover {
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--border-color));
}

.patent-item:last-child { margin-bottom: 0; }

.patent-item__title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 0.4rem;
  text-wrap: pretty;
}

.patent-item__meta {
  list-style: none;
  padding: 0 0 0 0.5rem;
  margin: 0;
}

.patent-item__meta li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-primary);
}

.patent-item__meta li::before {
  content: '\25AA';
  position: absolute;
  left: 0;
  top: 0.05rem;
  color: var(--text-secondary);
  font-size: 0.75rem;
}

.patent-label {
  color: var(--text-secondary);
  font-weight: 500;
  margin-right: 0.25rem;
}

.award-item:last-child {
  border-bottom: none;
}

.award-item__title {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.award-item__meta {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ---------- Research cards ---------- */
.research-list {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.research-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.research-section__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.005em;
}

.research-affil {
  font-size: 0.95rem;
  color: var(--text-primary);
  padding: 0.25rem 0 0.5rem;
}

.research-affil strong { color: var(--color-primary); }
.research-affil em { font-style: italic; color: var(--text-secondary); font-weight: 500; }
.research-affil__note { color: var(--text-secondary); font-size: 0.875rem; }

.research-section__projects {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.research-section__interns {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.research-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  gap: 1.5rem;
}

.research-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.research-card:hover {
  border-color: color-mix(in srgb, var(--color-primary) 35%, var(--border-color));
}

.research-card__header {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.research-card__period {
  margin-left: auto;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.research-card__code {
  color: var(--color-primary);
  font-weight: 600;
}

.research-card__org {
  color: var(--text-primary);
  font-weight: 600;
}

.research-card__title {
  font-size: 1.0625rem;
  font-weight: 500;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.research-card__keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 1rem;
}

.research-card__summary {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-primary);
}

.research-card__summary li {
  margin-bottom: 0.4em;
}

.research-card__summary u {
  text-decoration: none;
  color: var(--color-primary);
  font-weight: 500;
  background: linear-gradient(to top,
    color-mix(in srgb, var(--color-accent) 18%, transparent) 0,
    color-mix(in srgb, var(--color-accent) 18%, transparent) 38%,
    transparent 38%);
  padding: 0 2px;
}

.research-intern {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 0.85rem 1.1rem;
  transition: border-color 0.2s ease;
}

.research-intern:hover {
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--border-color));
}

.research-intern__header {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.research-intern__header strong { color: var(--color-primary); font-weight: 600; }
.research-intern__header em { font-style: italic; color: var(--text-secondary); font-weight: 500; }
.research-intern__period { color: var(--text-secondary); font-size: 0.85rem; font-variant-numeric: tabular-nums; }

.research-intern__items {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-primary);
  font-size: 0.9375rem;
  line-height: 1.55;
}

.research-intern__items li { margin-bottom: 0.2em; }

.badge--coauthor {
  font-size: 0.75rem;
  background: transparent;
  border-color: var(--text-secondary);
  color: var(--text-secondary);
  padding: 2px 8px;
  margin-left: 4px;
}

.badge--country {
  font-size: 0.75rem;
  background: transparent;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  padding: 2px 8px;
  margin-left: 6px;
  vertical-align: middle;
}

/* ---------- Others page ---------- */
.others-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.others-list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--text-primary);
}

.others-list li::before {
  content: '\25AA';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--text-secondary);
  font-size: 0.75rem;
}

.others-list em {
  font-style: italic;
  font-weight: 500;
  color: var(--text-primary);
}

/* legacy alias for any remaining references */

.coursework-group {
  margin-bottom: 1.25rem;
}

.coursework-group:last-child { margin-bottom: 0; }

.coursework-group__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 0.5rem 0;
  position: relative;
  padding-left: 1.1rem;
}

.coursework-group__title::before {
  content: '\25AA';
  position: absolute;
  left: 0;
  top: 0.15rem;
  color: var(--color-primary);
  font-size: 0.85rem;
}

.coursework-list {
  list-style: none;
  margin: 0 0 0 1.1rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.coursework-list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text-primary);
}

.coursework-list li::before {
  content: '\25AA';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--text-secondary);
  font-size: 0.7rem;
}

.coursework-note {
  color: var(--text-secondary);
  font-style: italic;
  font-size: 0.875rem;
}

/* Programming Skills */
.prog-group {
  margin-bottom: 1.25rem;
}

.prog-group:last-child { margin-bottom: 0; }

/* ---------- Skill rating dots ---------- */
.skill-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.skill-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.875rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.skill-name {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.skill-rating {
  display: inline-flex;
  gap: 6px;
}

.skill-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: transparent;
  border: 1.5px solid var(--color-accent);
  display: inline-block;
}

.skill-dot.is-filled {
  background: var(--color-accent);
}

.skill-dot.is-half {
  background: linear-gradient(90deg, var(--color-accent) 50%, transparent 50%);
}

.skill-subgroup {
  margin-top: 0.75rem;
}

.skill-subgroup__title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 0 0 0.4rem 0;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.skill-subgroup + .skill-subgroup {
  margin-top: 1rem;
}

.prog-group__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 0.5rem 0;
  position: relative;
  padding-left: 1.1rem;
}

.prog-group__title::before {
  content: '\25AA';
  position: absolute;
  left: 0;
  top: 0.15rem;
  color: var(--color-primary);
  font-size: 0.85rem;
}

.prog-list {
  list-style: none;
  margin: 0 0 0 1.1rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.prog-list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text-primary);
}

.prog-list li::before {
  content: '\25AA';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--text-secondary);
  font-size: 0.7rem;
}

.prog-list strong {
  font-weight: 600;
  color: var(--text-primary);
}

.prog-list--inner {
  margin-top: 0.3rem;
  margin-left: 0.5rem;
}

.prog-list--inner li {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.simple-list { display: none; }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-info__row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.contact-info__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.contact-info__value {
  color: var(--text-primary);
  font-size: 1rem;
}

.contact-map {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-card);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.contact-map iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

/* ---------- Loading state ---------- */
.loading {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-style: italic;
}

/* ---------- Responsive: hero ---------- */
@media (max-width: 480px) {
  .hero h1 { font-size: 1.875rem; }
  .page-header h1 { font-size: 1.625rem; }
  main { padding-top: 5.5rem; }
}

/* ---------- Responsive: body text shrink on mobile ---------- */
@media (max-width: 640px) {
  body {
    font-size: 0.875rem;   /* ~14px */
    line-height: 1.55;
  }
  .contact-info__value { font-size: 0.875rem; }
  .news-item__date,
  .news-item__body { font-size: 0.875rem; }
  .pub-item__authors,
  .pub-item__venue { font-size: 0.875rem; }

  /* Education page — shrink card body to 12px on mobile */
  .edu-card { font-size: 0.75rem; }
  .edu-card__period,
  .edu-card__school,
  .edu-card__loc { font-size: 0.75rem; }
  .edu-details li { font-size: 0.75rem; }
}
