@import url('https://fonts.googleapis.com/css2?family=Linux+Biolinum:ital,wght@0,400;0,700;1,400;1,700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;700;800&display=swap');

:root {
  --bg-top: #f5f8ff;
  --bg-bottom: #fffdf7;
  --card: #ffffff;
  --ink: #1d2433;
  --muted: #4f5666;
  --accent: #1f5dff;
  --accent-soft: #eaf0ff;
  --line: #dce4f5;
  --tag-default-bg: #f2f6ff;
  --tag-default-line: #d1ddfb;
  --tag-default-ink: #28468e;
  --tag-epi-bg: #eaf8f3;
  --tag-epi-line: #bde7d2;
  --tag-epi-ink: #1f6145;
  --tag-ml-bg: #e9f1ff;
  --tag-ml-line: #c5d7ff;
  --tag-ml-ink: #274c9a;
  --tag-graphics-bg: #fff4e6;
  --tag-graphics-line: #f4d3a9;
  --tag-graphics-ink: #95531f;
  --tag-optimization-bg: #f2ecff;
  --tag-optimization-line: #d8c6ff;
  --tag-optimization-ink: #5c3998;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: 'Linux Biolinum', 'Manrope', 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(165deg, var(--bg-top) 0%, var(--bg-bottom) 55%, #f7fbff 100%);
  position: relative;
  overflow-x: hidden;
}

body.intro-open {
  overflow: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

p {
  margin: 0;
  line-height: 1.6;
  color: var(--muted);
}

.site-shell {
  width: min(960px, calc(100% - 2rem));
  margin: 2rem auto 2.5rem;
  display: grid;
  gap: 1rem;
  position: relative;
  z-index: 1;
  transition: transform 0.55s ease, opacity 0.55s ease, filter 0.55s ease;
}

body.intro-open .site-shell {
  transform: scale(0.99);
  opacity: 0.38;
  filter: blur(4px);
  pointer-events: none;
}

body.intro-dismissed .site-shell {
  transform: none;
  opacity: 1;
  filter: none;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(22, 43, 92, 0.06);
  padding: 1.35rem;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(280px 120px at 100% 0%, rgba(31, 93, 255, 0.04), transparent 70%),
    radial-gradient(220px 100px at 0% 100%, rgba(240, 179, 80, 0.05), transparent 70%);
}

.card > * {
  position: relative;
  z-index: 1;
}

.intro-splash {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 1rem;
  background:
    radial-gradient(700px 420px at 12% 15%, rgba(31, 93, 255, 0.16), transparent 70%),
    radial-gradient(620px 360px at 88% 16%, rgba(240, 179, 80, 0.16), transparent 72%),
    linear-gradient(165deg, rgba(245, 248, 255, 0.98) 0%, rgba(255, 253, 247, 0.98) 100%);
  backdrop-filter: blur(10px);
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.intro-splash.is-exiting {
  opacity: 0;
  visibility: hidden;
}

.intro-splash-card {
  width: min(760px, 100%);
  border-radius: 22px;
  padding: 1.15rem 1.15rem 1.05rem;
  border: 1px solid rgba(220, 228, 245, 0.95);
  background:
    radial-gradient(280px 120px at 100% 0%, rgba(31, 93, 255, 0.07), transparent 70%),
    radial-gradient(220px 120px at 0% 100%, rgba(240, 179, 80, 0.08), transparent 72%),
    rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 60px rgba(22, 43, 92, 0.12);
  display: grid;
  gap: 0.9rem;
  animation: introCardIn 0.75s cubic-bezier(.2,.75,.2,1);
}

.intro-visual {
  position: relative;
  border-radius: 16px;
  border: 1px solid #e1e8f8;
  background:
    radial-gradient(220px 110px at 18% 18%, rgba(31, 93, 255, 0.10), transparent 70%),
    radial-gradient(220px 110px at 82% 18%, rgba(240, 179, 80, 0.10), transparent 70%),
    linear-gradient(180deg, #fbfdff 0%, #fffdf8 100%);
  min-height: 220px;
  overflow: hidden;
}

.intro-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(31, 93, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 93, 255, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(circle at 50% 45%, black 45%, transparent 100%);
}

.intro-mesh {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  filter: saturate(1.05);
  animation: introFloat 7.5s ease-in-out infinite;
}

.intro-grid-lines line {
  stroke: rgba(31, 93, 255, 0.08);
  stroke-width: 1;
}

.intro-triangles polygon {
  fill: rgba(31, 93, 255, 0.04);
  stroke: rgba(31, 93, 255, 0.06);
  stroke-width: 1;
}

.intro-edges line {
  stroke: url(#introMeshStroke);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-dasharray: 8 10;
  animation: introDash 13s linear infinite;
}

.intro-nodes circle {
  fill: #1f5dff;
  stroke: rgba(255, 255, 255, 0.9);
  stroke-width: 1.6;
  animation: introPulse 2.1s ease-in-out infinite;
  animation-delay: var(--d, 0s);
}

.intro-nodes circle:nth-child(3),
.intro-nodes circle:nth-child(6) {
  fill: #f0b350;
}

.intro-orbit {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 68%;
  height: 68%;
  border-radius: 999px;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(31, 93, 255, 0.12);
  pointer-events: none;
}

.intro-orbit::before {
  content: "";
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #1f5dff;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 0 5px rgba(31, 93, 255, 0.10);
}

.intro-orbit-a {
  animation: introSpin 16s linear infinite;
}

.intro-orbit-b {
  width: 52%;
  height: 52%;
  border-color: rgba(240, 179, 80, 0.18);
  transform: translate(-50%, -50%) rotate(26deg);
  animation: introSpinReverse 11s linear infinite;
}

.intro-orbit-b::before {
  background: #f0b350;
  box-shadow: 0 0 0 5px rgba(240, 179, 80, 0.10);
}

.intro-kicker {
  color: #4a5a82;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.intro-title {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.7rem);
  line-height: 1.05;
  color: #14203c;
}

.intro-subtitle {
  max-width: 62ch;
  font-size: 1.02rem;
  color: #485166;
}

.intro-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

.intro-enter-btn,
.intro-text-btn {
  font: inherit;
  cursor: pointer;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.14s ease, background-color 0.14s ease, border-color 0.14s ease, color 0.14s ease;
}

.intro-enter-btn {
  padding: 0.55rem 0.95rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #1f5dff 0%, #3b76ff 100%);
  box-shadow: 0 8px 24px rgba(31, 93, 255, 0.22);
}

.intro-enter-btn:hover,
.intro-enter-btn:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.intro-text-btn {
  padding: 0.48rem 0.85rem;
  font-weight: 700;
  color: #304061;
  background: #f8faff;
  border-color: #d5def6;
}

.intro-text-btn:hover,
.intro-text-btn:focus-visible {
  color: var(--accent);
  border-color: #b7c8fb;
  outline: none;
}

@keyframes introCardIn {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes introFloat {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-4px);
  }
}

@keyframes introDash {
  to {
    stroke-dashoffset: -180;
  }
}

@keyframes introPulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.9;
  }
  50% {
    transform: scale(1.18);
    opacity: 1;
  }
}

@keyframes introSpin {
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

@keyframes introSpinReverse {
  to {
    transform: translate(-50%, -50%) rotate(-334deg);
  }
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(190px, 1fr);
  gap: 1.25rem;
  align-items: start;
}

.name {
  margin-bottom: 0.8rem;
  font-family: 'Linux Biolinum', 'Manrope', 'Helvetica Neue', Arial, sans-serif;
  font-size: clamp(1.85rem, 3.1vw, 2.35rem);
  line-height: 1.15;
  color: var(--ink);
}

.name-alt {
  font-size: 0.72em;
  font-weight: 600;
  color: #5d6272;
}

.hero-text {
  display: grid;
  gap: 0.75rem;
}

.hero-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-weight: 700;
}

.hero-links .sep {
  color: #8a90a0;
}

.hero-photo-wrap {
  display: flex;
  justify-content: center;
}

.hero-photo {
  width: 100%;
  max-width: 250px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid var(--line);
}

.block {
  display: grid;
  gap: 0.95rem;
}

h2 {
  margin: 0;
  font-family: 'Linux Biolinum', 'Manrope', 'Helvetica Neue', Arial, sans-serif;
  font-size: 1.55rem;
  color: #14203c;
  display: inline-flex;
  width: fit-content;
  border-bottom: 2px solid #cfdafe;
}

.publication-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.filter-btn {
  border: 1px solid #c8d6fc;
  background: #f7faff;
  color: #2f3d66;
  padding: 0.36rem 0.7rem;
  border-radius: 999px;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.16s ease;
}

.filter-btn:hover,
.filter-btn:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

.filter-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.publication-list {
  display: grid;
  gap: 0.8rem;
}

.news-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.7rem;
}

.news-list li {
  padding: 0.8rem 0.9rem;
  border-radius: 10px;
  background: linear-gradient(120deg, #f8fbff 0%, #fff9ea 100%);
  border: 1px solid #e5ebf8;
  color: #363d4f;
}

.news-list li.news-highlight {
  background: linear-gradient(120deg, #eaf2ff 0%, #f5f9ff 100%) !important;
  border: 1px solid #9fb9ff !important;
  border-left: 4px solid #1f5dff !important;
  color: #1f2f4f;
  box-shadow: 0 6px 16px rgba(31, 93, 255, 0.14);
}

.news-list li.news-highlight .news-date {
  color: #ffffff;
  background: #1f5dff;
  padding: 0.1rem 0.46rem;
  border-radius: 999px;
  min-width: 0;
  margin-right: 0.5rem;
}

.news-date {
  display: inline-block;
  min-width: 74px;
  margin-right: 0.45rem;
  color: #2547ac;
  font-weight: 800;
}

.publication-item {
  display: grid;
  grid-template-columns: minmax(130px, 170px) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  padding: 0.2rem;
}

.publication-item img {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
}

.publication-item > div {
  display: grid;
  gap: 0.4rem;
}

.publication-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.publication-tag {
  display: inline-flex;
  padding: 0.2rem 0.52rem;
  border-radius: 999px;
  border: 1px solid var(--tag-default-line);
  background: var(--tag-default-bg);
  color: var(--tag-default-ink);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.publication-tag[data-topic="epidemiology"] {
  border-color: var(--tag-epi-line);
  background: var(--tag-epi-bg);
  color: var(--tag-epi-ink);
}

.publication-tag[data-topic="machine-learning"] {
  border-color: var(--tag-ml-line);
  background: var(--tag-ml-bg);
  color: var(--tag-ml-ink);
}

.publication-tag[data-topic="graphics"] {
  border-color: var(--tag-graphics-line);
  background: var(--tag-graphics-bg);
  color: var(--tag-graphics-ink);
}

.publication-tag[data-topic="numerical-optimization"] {
  border-color: var(--tag-optimization-line);
  background: var(--tag-optimization-bg);
  color: var(--tag-optimization-ink);
}

.publication-title {
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 800;
}

.publication-note {
  margin-top: 0.35rem;
  padding: 0.72rem 0.82rem;
  border-radius: 9px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  color: #2d3550;
}

.publication-empty {
  font-style: italic;
  color: #5f6678;
}

.collapsible-section {
  gap: 0;
}

.collapsible-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  list-style: none;
  cursor: pointer;
}

.collapsible-summary::-webkit-details-marker {
  display: none;
}

.collapsible-summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 8px;
}

.collapsible-toggle {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 800;
}

.collapsible-toggle::after {
  content: "Show";
}

.collapsible-section[open] .collapsible-toggle::after {
  content: "Hide";
}

.collapsible-content {
  display: grid;
  gap: 0.95rem;
  margin-top: 0.95rem;
}

.experience-item {
  padding: 0.9rem;
  border-radius: 10px;
  border: 1px solid #e4eaf9;
  background: #fcfdff;
  display: grid;
  gap: 0.35rem;
}

.experience-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.9rem;
}

.experience-place,
.experience-date,
.experience-role {
  color: var(--ink);
}

.experience-place {
  font-size: 1.02rem;
  font-weight: 800;
}

.experience-date {
  font-size: 0.92rem;
  color: #646d80;
  white-space: nowrap;
}

.experience-role {
  font-size: 0.95rem;
  font-weight: 700;
}

@media (max-width: 760px) {
  .site-shell {
    width: calc(100% - 1.2rem);
    margin: 0.9rem auto 1.2rem;
  }

  .card {
    border-radius: 12px;
    padding: 1rem;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-photo-wrap {
    justify-content: flex-start;
  }

  .hero-photo {
    max-width: 190px;
  }

  .publication-item {
    grid-template-columns: 1fr;
  }

  .publication-item img {
    max-width: 220px;
  }

  .experience-head {
    flex-direction: column;
    gap: 0.2rem;
  }

  .news-date {
    min-width: 0;
    margin-right: 0.3rem;
  }
}

@media (max-width: 760px) {
  .intro-splash {
    padding: 0.7rem;
  }

  .intro-splash-card {
    border-radius: 16px;
    padding: 0.85rem;
    gap: 0.75rem;
  }

  .intro-visual {
    min-height: 185px;
  }

  .intro-kicker {
    font-size: 0.88rem;
  }

  .intro-subtitle {
    font-size: 0.95rem;
  }

  .intro-actions {
    gap: 0.55rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .intro-splash,
  .site-shell {
    transition: none;
  }

  .intro-splash-card,
  .intro-mesh,
  .intro-edges line,
  .intro-nodes circle,
  .intro-orbit-a,
  .intro-orbit-b {
    animation: none !important;
  }
}