:root {
  --ink: #182235;
  --muted: #5f6b7c;
  --line: #d8dee8;
  --surface: #ffffff;
  --soft: #f4f7fb;
  --accent: #1f6feb;
  --accent-dark: #174ea6;
  --focus: #b7d2ff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #eef3f8;
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
}

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

a:hover {
  text-decoration: underline;
}

button {
  font: inherit;
}

.page-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 56px;
}

.hero,
.news-section,
.tab-panels {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 45px rgba(24, 34, 53, 0.08);
}

.hero {
  padding: 30px;
}

.profile-card {
  display: grid;
  grid-template-columns: 172px 1fr;
  gap: 28px;
  align-items: center;
}

.profile-photo {
  width: 172px;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: center 18%;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.15;
  border: 0;
  padding: 0;
}

h1 {
  font-size: 2.7rem;
}

h2 {
  font-size: 1.45rem;
  margin-bottom: 16px;
}

h3 {
  font-size: 1.05rem;
}

.lead {
  max-width: 780px;
  margin: 14px 0 18px;
  color: #344256;
  font-size: 1.08rem;
  line-height: 1.55;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.link-row a,
.news-panel a,
.resource-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--soft);
  color: var(--accent-dark);
  font-weight: 700;
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.summary-strip div {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.summary-strip span,
.timeline span,
.panel-date {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
}

.summary-strip strong {
  display: block;
  margin-top: 4px;
}

.tab-nav {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  gap: 8px;
  margin: 18px 0;
  padding: 10px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
}

.tab-button,
.news-item {
  border: 1px solid var(--line);
  cursor: pointer;
  text-align: left;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.tab-button {
  min-height: 40px;
  padding: 9px 13px;
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  white-space: nowrap;
}

.tab-button:hover,
.tab-button.active,
.news-item:hover,
.news-item.active {
  border-color: var(--focus);
  background: #eaf2ff;
  color: var(--accent-dark);
}

.news-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 24px;
  margin-bottom: 18px;
  padding: 24px;
  align-items: start;
}

.news-list {
  display: grid;
  gap: 10px;
}

.news-item {
  width: 100%;
  padding: 13px 14px;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  line-height: 1.35;
}

.news-item span {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.news-panel {
  position: sticky;
  top: 76px;
  min-height: 260px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, #f9fbff 0%, #ffffff 100%);
  opacity: 0;
  transform: translateX(16px);
  transition: opacity 220ms ease, transform 220ms ease;
}

.news-panel.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.news-panel h3 {
  margin: 8px 0 12px;
  font-size: 1.35rem;
}

.news-panel p {
  color: #344256;
  line-height: 1.55;
}

.tab-panels {
  padding: 28px;
}

.tab-panel {
  display: none;
  animation: panelIn 220ms ease;
}

.tab-panel.active {
  display: block;
}

@keyframes panelIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tab-panel > p,
.info-card p,
.project-list p,
.timeline p,
.tab-panel li {
  color: #344256;
  line-height: 1.55;
}

.section-note {
  margin: -4px 0 18px;
  color: var(--muted);
  line-height: 1.5;
}

.section-note code {
  padding: 2px 5px;
  border-radius: 4px;
  background: #e8edf5;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 20px;
}

.tag-row span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: #344256;
  font-weight: 700;
}

.subsection-title {
  margin-top: 44px;
  margin-bottom: 12px;
}

.info-card,
.project-card,
.skill-grid div {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.timeline,
.tab-panel ul {
  padding-left: 20px;
}

.timeline li {
  margin-bottom: 15px;
}

.project-list {
  display: grid;
  gap: 14px;
}

.project-card {
  padding: 0;
  overflow: hidden;
}

.project-card summary {
  display: block;
  padding: 16px 18px;
  cursor: pointer;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.35;
}

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

.project-card summary::after {
  content: "+";
  float: right;
  margin-left: 12px;
  color: var(--accent-dark);
  font-weight: 700;
}

.project-card[open] summary::after {
  content: "-";
}

.project-card summary span {
  display: block;
  margin-bottom: 4px;
  color: var(--accent-dark);
  font-size: 0.86rem;
}

.project-card ul {
  margin: 0;
  padding: 0 18px 14px;
  color: #344256;
  line-height: 1.55;
}

.project-card ul {
  padding-left: 38px;
}

.publication-list {
  margin: 0;
  padding-left: 22px;
}

.publication-list li {
  margin-bottom: 12px;
}

.publication-list p {
  margin: 0;
  color: #344256;
  line-height: 1.5;
}

.publication-list strong {
  color: var(--ink);
}

.pub-links {
  margin-top: 3px;
  font-size: 0.93rem;
}

.resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 18px 18px;
}

.resource-links a[href="#"],
.resource-links a[aria-disabled="true"] {
  color: var(--muted);
  background: #fff;
  border-style: dashed;
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.skill-grid strong,
.skill-grid span {
  display: block;
}

.skill-grid span {
  margin-top: 6px;
  color: #344256;
  line-height: 1.45;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.link-grid section {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.link-grid h3 {
  margin-bottom: 12px;
}

.link-grid a {
  display: block;
  padding: 8px 0;
  border-top: 1px solid var(--line);
  line-height: 1.35;
}

@media (max-width: 860px) {
  .profile-card,
  .news-section,
  .summary-strip,
  .card-grid,
  .skill-grid,
  .link-grid {
    grid-template-columns: 1fr;
  }

  .news-panel {
    position: static;
  }

  .profile-photo {
    width: 148px;
  }
}

@media (max-width: 560px) {
  .page-shell {
    width: min(100% - 20px, 1120px);
    padding-top: 10px;
  }

  .hero,
  .news-section,
  .tab-panels {
    padding: 18px;
  }

  h1 {
    font-size: 2.1rem;
  }

  .tab-nav {
    margin: 12px 0;
  }
}