/* ── Google Fonts ─────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.7;
  color: #1c1c1e;
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: #2563eb; text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
em { font-style: italic; }
strong { font-weight: 600; }

/* ── Navigation ───────────────────────────────────────────────── */
nav {
  background: #f5f5f7;
  border-bottom: 1px solid rgba(0,0,0,0.09);
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 200;
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: stretch;
  padding: 0 24px;
  gap: 0;
}

.nav-home {
  font-weight: 700;
  font-size: 14.5px;
  letter-spacing: -0.01em;
  color: #1c1c1e !important;
  padding: 0 20px 0 0;
  display: inline-flex;
  align-items: center;
  border-right: 1px solid rgba(0,0,0,0.1);
  margin-right: 4px;
  white-space: nowrap;
  text-decoration: none !important;
  flex-shrink: 0;
}

.nav-home:hover { opacity: 0.75; text-decoration: none !important; }

nav a {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 11px;
  font-size: 13px;
  font-weight: 450;
  color: #3a3a3c;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  letter-spacing: 0.01em;
  transition: color 0.15s;
}

nav a:hover { color: #000; text-decoration: none; }

nav a.active {
  color: #000;
  font-weight: 600;
  border-bottom: 2px solid #1c1c1e;
}

/* ── Hero ─────────────────────────────────────────────────────── */
.hero {
  position: relative;
  height: 420px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center 40%;
  transform: scale(1.02);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0,0,0,0.18) 0%,
    rgba(0,0,0,0.42) 100%
  );
}

.hero-text {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px 26px;
  color: #fff;
}

.hero-text h2 {
  font-size: 16.5px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  text-shadow: 0 1px 6px rgba(0,0,0,0.4);
  opacity: 0.96;
}

/* ── Page wrapper ─────────────────────────────────────────────── */
.page-wrapper {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  gap: 52px;
  padding: 40px 24px 64px;
}

.page-wrapper.narrow {
  max-width: 960px;
}

/* ── Sidebar ──────────────────────────────────────────────────── */
.sidebar {
  width: 188px;
  flex-shrink: 0;
}

.sidebar .avatar {
  width: 148px;
  height: 148px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin: 0 auto 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
}

.sidebar .author-name {
  font-size: 15.5px;
  font-weight: 700;
  text-align: center;
  color: #1c1c1e;
  letter-spacing: -0.01em;
}

.sidebar .author-meta {
  margin-top: 5px;
  font-size: 12.5px;
  color: #6e6e73;
  text-align: center;
  line-height: 1.6;
}

.sidebar .divider {
  border: none;
  border-top: 1px solid #e5e5ea;
  margin: 16px 0;
}

.sidebar .author-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar .author-links a {
  font-size: 12.5px;
  color: #3a3a3c;
  display: flex;
  align-items: center;
  gap: 7px;
  text-decoration: none;
  font-weight: 450;
  transition: color 0.15s;
}

.sidebar .author-links a:hover {
  color: #2563eb;
  text-decoration: none;
}

.sidebar .author-links svg {
  width: 14px;
  height: 14px;
  min-width: 14px;
  min-height: 14px;
  flex-shrink: 0;
  fill: currentColor;
  opacity: 0.6;
}

/* ── Main content ─────────────────────────────────────────────── */
.main-content { flex: 1; min-width: 0; }

.main-content h1 {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #1c1c1e;
  margin-bottom: 6px;
  padding-bottom: 12px;
  border-bottom: 1px solid #e5e5ea;
}

.main-content .page-subtitle {
  font-size: 13.5px;
  color: #6e6e73;
  margin-bottom: 22px;
  margin-top: 2px;
}

.main-content h2 {
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -0.01em;
  color: #1c1c1e;
  margin: 32px 0 10px;
}

.main-content h3 {
  font-size: 14.5px;
  font-weight: 600;
  color: #1c1c1e;
  margin: 20px 0 8px;
}

.main-content p {
  margin-bottom: 16px;
  line-height: 1.78;
  color: #1c1c1e;
}

.main-content ul,
.main-content ol { padding-left: 20px; margin-bottom: 14px; }

.main-content li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.about-intro p { font-size: 14px; }

/* ── Table search bar ─────────────────────────────────────────── */
.table-search {
  display: block;
  width: 100%;
  max-width: 340px;
  padding: 7px 12px;
  margin-bottom: 14px;
  font-family: inherit;
  font-size: 13px;
  color: #1c1c1e;
  background: #fff;
  border: 1px solid #d1d1d6;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.table-search::placeholder { color: #aeaeb2; }

.table-search:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}

/* ── Research table ───────────────────────────────────────────── */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 4px;
}

.table-scroll .paper-table {
  margin-top: 0;
  min-width: 560px;
}

.paper-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-top: 4px;
}

.paper-table col.col-title   { width: 46%; }
.paper-table col.col-journal { width: 21%; }
.paper-table col.col-authors { width: 20%; }
.paper-table col.col-year    { width: 5%; }
.paper-table col.col-topics  { width: 8%; }

.paper-table thead th {
  text-align: left;
  padding: 9px 12px;
  background: #f5f5f7;
  border-top: 1px solid #e5e5ea;
  border-bottom: 1.5px solid #d1d1d6;
  font-size: 11.5px;
  font-weight: 600;
  color: #6e6e73;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.paper-table thead th.sortable {
  cursor: pointer;
  user-select: none;
}

.paper-table thead th.sortable:hover { color: #1c1c1e; }

.paper-table thead th.sortable::after {
  content: ' ⇅';
  opacity: 0.35;
  font-size: 10px;
}

.paper-table thead th.sort-asc::after  { content: ' ↑'; opacity: 1; color: #2563eb; }
.paper-table thead th.sort-desc::after { content: ' ↓'; opacity: 1; color: #2563eb; }

.paper-table tbody td {
  padding: 14px 12px;
  vertical-align: top;
  border-bottom: 1px solid #f0f0f5;
}

.paper-table tbody tr:last-child td { border-bottom: 1px solid #e5e5ea; }

.paper-table tbody tr:hover td {
  background: #fafafa;
}

.paper-title {
  font-size: 13px;
  font-weight: 500;
  line-height: 1.5;
  color: #1c1c1e;
}

.paper-title a {
  color: #1c1c1e;
  text-decoration: none;
  border-bottom: 1px solid #c0c0c8;
  padding-bottom: 1px;
  transition: border-color 0.15s, color 0.15s;
}

.paper-title a:hover {
  color: #2563eb;
  border-bottom-color: #2563eb;
  text-decoration: none;
}

.paper-links {
  font-size: 11.5px;
  color: #6e6e73;
  margin-top: 5px;
  display: flex;
  flex-wrap: wrap;
  gap: 3px 10px;
  align-items: center;
}

.paper-links a {
  font-size: 11.5px;
  color: #2563eb;
  font-weight: 500;
}

.paper-links a:hover { text-decoration: underline; }

/* ── Collapsible details ──────────────────────────────────────── */
.paper-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 7px;
}

.paper-table details { display: inline; }

.paper-table details summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  padding: 2px 9px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: #3a3a3c;
  border: 1px solid #d1d1d6;
  border-radius: 20px;
  background: #f5f5f7;
  user-select: none;
  transition: background 0.12s, border-color 0.12s;
  white-space: nowrap;
}

.paper-table details summary:hover {
  background: #e5e5ea;
  border-color: #b0b0b8;
  color: #1c1c1e;
}

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

.paper-table details[open] summary {
  background: #e8eeff;
  border-color: #93a8f4;
  color: #2563eb;
}

.detail-body {
  display: block;
  margin-top: 10px;
  padding: 10px 14px;
  font-size: 12.5px;
  color: #3a3a3c;
  line-height: 1.7;
  background: #f9f9fb;
  border-left: 3px solid #d1d1d6;
  border-radius: 0 6px 6px 0;
}

.detail-body a { font-size: 12.5px; }

.journal-name { font-style: italic; color: #3a3a3c; font-size: 12.5px; }
.year-cell    { white-space: nowrap; color: #6e6e73; font-size: 12.5px; font-weight: 500; }
.topics-cell  { font-size: 11.5px; color: #8e8e93; line-height: 1.55; }
.status-cell  { font-style: italic; color: #6e6e73; font-size: 12.5px; }

/* ── Topic pills (in table cells) ────────────────────────────── */
.topic-tag {
  display: inline-block;
  padding: 1px 7px;
  margin: 2px 2px 2px 0;
  font-size: 11px;
  color: #6e6e73;
  background: #f0f0f5;
  border: 1px solid #e0e0e8;
  border-radius: 20px;
  cursor: pointer;
  user-select: none;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  white-space: nowrap;
}

.topic-tag:hover {
  background: #e5e5ea;
  color: #1c1c1e;
  border-color: #b0b0b8;
}

.topic-tag.active {
  background: #e8eeff;
  border-color: #93a8f4;
  color: #2563eb;
}

/* ── Topic filter bar ─────────────────────────────────────────── */
.topic-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 14px;
}

.topic-filter-label {
  font-size: 11.5px;
  font-weight: 600;
  color: #6e6e73;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
  margin-right: 2px;
}

.topic-filter-btn {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-family: inherit;
  font-size: 11.5px;
  font-weight: 500;
  color: #3a3a3c;
  background: #f5f5f7;
  border: 1px solid #d1d1d6;
  border-radius: 20px;
  cursor: pointer;
  user-select: none;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  white-space: nowrap;
}

.topic-filter-btn:hover {
  background: #e5e5ea;
  border-color: #b0b0b8;
  color: #1c1c1e;
}

.topic-filter-btn.active {
  background: #2563eb;
  border-color: #2563eb;
  color: #fff;
}

/* ── Teaching ─────────────────────────────────────────────────── */
.teaching-section { margin-bottom: 4px; }

.teaching-section details {
  display: block;
  margin-top: 6px;
  margin-left: 16px;
}

.teaching-section details summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  padding: 2px 9px;
  font-size: 11px;
  font-weight: 500;
  color: #3a3a3c;
  border: 1px solid #d1d1d6;
  border-radius: 20px;
  background: #f5f5f7;
  user-select: none;
  transition: background 0.12s;
  white-space: nowrap;
}

.teaching-section details summary:hover { background: #e5e5ea; }
.teaching-section details summary::-webkit-details-marker { display: none; }
.teaching-section details summary::marker { display: none; }
.teaching-section details[open] summary { background: #e8eeff; border-color: #93a8f4; color: #2563eb; }

.teaching-section details ul {
  margin-top: 8px;
  margin-left: 4px;
  padding-left: 16px;
}

.teaching-section details li { margin-bottom: 6px; font-size: 13px; }

/* ── Data ─────────────────────────────────────────────────────── */
.data-item { margin-bottom: 22px; }

.data-item details {
  display: block;
  margin-top: 7px;
}

.data-item details summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  padding: 2px 9px;
  font-size: 11px;
  font-weight: 500;
  color: #3a3a3c;
  border: 1px solid #d1d1d6;
  border-radius: 20px;
  background: #f5f5f7;
  user-select: none;
  transition: background 0.12s;
}

.data-item details summary:hover { background: #e5e5ea; }
.data-item details summary::-webkit-details-marker { display: none; }
.data-item details summary::marker { display: none; }
.data-item details[open] summary { background: #e8eeff; border-color: #93a8f4; color: #2563eb; }

.data-item details ul {
  margin-top: 8px;
  padding-left: 18px;
}

.data-item details li { margin-bottom: 6px; font-size: 13px; }

/* ── Collaboration iframes ────────────────────────────────────── */
.iframe-container {
  width: 100%;
  margin: 12px 0 28px;
  border: 1px solid #e5e5ea;
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}

.iframe-container iframe {
  display: block;
  width: 100%;
  border: none;
}

/* ── Contact ──────────────────────────────────────────────────── */
.contact-address {
  font-size: 14px;
  line-height: 2;
  color: #3a3a3c;
  margin-bottom: 28px;
  padding: 16px 20px;
  background: #f5f5f7;
  border-radius: 8px;
  border: 1px solid #e5e5ea;
}

/* ── Footer ───────────────────────────────────────────────────── */
footer {
  border-top: 1px solid #e5e5ea;
  padding: 20px 24px;
  text-align: center;
  font-size: 12px;
  color: #aeaeb2;
  margin-top: 16px;
}

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 640px) {
  .page-wrapper {
    flex-direction: column;
    gap: 28px;
    padding: 24px 16px 48px;
  }

  .sidebar {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .sidebar .author-links { align-items: flex-start; }

  .nav-inner { padding: 0 12px; }
  nav a { padding: 0 8px; font-size: 12px; }
  .nav-home { padding-right: 10px; font-size: 13.5px; }

  .main-content h1 { font-size: 19px; }

  .paper-table col.col-topics,
  .paper-table col.col-year { width: 0; }
  .topics-cell, .year-cell,
  .paper-table thead th:nth-child(4),
  .paper-table thead th:nth-child(5) { display: none; }
}