@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&family=DM+Mono:wght@300;400&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --ink:      #0d0d0d;
  --muted:    #717171;
  --soft:     #a0a0a0;
  --rule:     #e4e4e4;
  --bg:       #ffffff;
  --bg2:      #faf8ff;
  --accent:   #6d28d9;
  --accent2:  #4c1d95;
  --tag-bg:   #f5f3ff;
  --tag-text: #6d28d9;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Plus Jakarta Sans', system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ── Page wrapper ── */
.page-wrap {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── Nav ── */
.site-nav {
  padding: 1.3rem 0;
  border-bottom: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}

.nav-name {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  font-weight: 400;
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--ink); }

/* ── Hero ── */
.hero {
  padding: 4.5rem 0 3.5rem;
  display: grid;
  grid-template-columns: 1fr 155px;
  gap: 3.5rem;
  align-items: start;
  border-bottom: 2px solid var(--ink);
}

.hero h1 {
  font-size: 2.6rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.4rem;
}

.hero-role {
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 1.6rem;
}

.hero-bio p {
  font-size: 0.97rem;
  color: #2a2a2a;
  margin-bottom: 0.9rem;
  font-weight: 300;
  line-height: 1.75;
}

.hero-bio p:last-child { margin-bottom: 0; }

.hero-links {
  margin-top: 1.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.hero-link {
  font-family: 'DM Mono', monospace;
  font-size: 0.64rem;
  letter-spacing: 0.05em;
  color: var(--ink);
  border: 1px solid var(--rule);
  padding: 0.35rem 0.75rem;
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.hero-link:hover {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
  text-decoration: none;
}

.hero-photo {
  width: 155px;
  height: 195px;
  object-fit: cover;
  object-position: top;
  display: block;
}

/* ── Section base ── */
section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--rule);
}

section:last-of-type { border-bottom: none; }

.section-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule);
}

/* ── Research interests ── */
.interests-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.interest-item {
  padding: 0.75rem 1rem;
  background: var(--bg2);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.interest-item::before {
  content: '';
  width: 3px;
  height: 1.1rem;
  background: var(--accent);
  flex-shrink: 0;
}

/* ── Teaching ── */
.teaching-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule);
  gap: 1rem;
}

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

.teaching-code {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  color: var(--muted);
  margin-right: 0.5rem;
}

.teaching-right { text-align: right; flex-shrink: 0; }

.teaching-term {
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  color: var(--soft);
}

/* ── Research group ── */
.student-item {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.95rem;
}

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

.student-degree {
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  color: var(--muted);
}

.recruit-note {
  padding: 1rem 1.2rem;
  border-left: 3px solid var(--accent);
  background: var(--tag-bg);
  font-size: 0.9rem;
  color: #2a2a2a;
  font-weight: 300;
}

/* ── News ── */
.news-item {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 1.5rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.93rem;
}

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

.news-date {
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  color: var(--soft);
  padding-top: 0.18rem;
}

/* ── Publications ── */
.under-construction {
  padding: 2rem;
  border: 1px dashed var(--rule);
  text-align: center;
}

.under-construction p {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.under-construction p:first-child {
  font-size: 1.2rem;
  letter-spacing: 0;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.pub-item {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--rule);
}

.pub-item:last-child { border-bottom: none; }
.pub-title { font-size: 0.97rem; font-weight: 600; margin-bottom: 0.2rem; letter-spacing: -0.01em; }

.pub-authors {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.2rem;
  font-weight: 300;
}

.pub-authors strong { color: var(--ink); font-weight: 500; }

.pub-venue {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
  font-weight: 300;
}

.pub-links { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.pub-link {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  color: var(--tag-text);
  background: var(--tag-bg);
  padding: 0.18rem 0.55rem;
  text-decoration: none;
  transition: background 0.15s;
}

.pub-link:hover { background: #ede9fe; text-decoration: none; }

.pub-award {
  font-family: 'DM Mono', monospace;
  font-size: 0.57rem;
  color: #5b21b6;
  background: #ede9fe;
  padding: 0.12rem 0.45rem;
  margin-left: 0.4rem;
  vertical-align: middle;
}

/* ── Contact ── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem 3rem;
}

.contact-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--soft);
  margin-bottom: 0.25rem;
}

.contact-grid div > div:last-child {
  font-size: 0.95rem;
  font-weight: 300;
}

/* ── Footer ── */
.site-footer {
  padding: 2rem 0;
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  color: var(--soft);
  letter-spacing: 0.05em;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--rule);
  margin-top: 1rem;
}

/* ══════════════════════════════════════
   COURSE PAGE
══════════════════════════════════════ */
.course-header {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 2px solid var(--ink);
}

.course-code-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.6rem;
}

.course-header h1 {
  font-size: 2.2rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.4rem;
}

.course-header h1 em { font-style: italic; color: var(--accent); font-weight: 400; }

.course-term {
  font-family: 'DM Mono', monospace;
  font-size: 0.67rem;
  color: var(--muted);
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem 3rem;
}

.info-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--soft);
  margin-bottom: 0.15rem;
}

.course-desc {
  margin-top: 2rem;
  font-size: 0.97rem;
  max-width: 64ch;
  font-weight: 300;
  color: #2a2a2a;
}

.syllabus-btn {
  display: inline-block;
  margin-top: 1.4rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.67rem;
  letter-spacing: 0.04em;
  color: var(--bg);
  background: var(--ink);
  padding: 0.5rem 1rem;
  text-decoration: none;
  transition: background 0.15s;
}

.syllabus-btn:hover { background: var(--accent); text-decoration: none; }

/* ── Lecture table ── */
.lecture-table { width: 100%; border-collapse: collapse; }

.lecture-table thead th {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--soft);
  font-weight: 400;
  text-align: left;
  padding: 0 0 0.6rem;
  border-bottom: 2px solid var(--ink);
}

.lecture-table tbody tr {
  border-bottom: 1px solid var(--rule);
  transition: background 0.1s;
}

.lecture-table tbody tr:hover { background: var(--bg2); }
.lecture-table tbody tr:last-child { border-bottom: none; }

.lecture-table td {
  padding: 0.85rem 0;
  font-size: 0.93rem;
  vertical-align: top;
}

.lec-date {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  color: var(--soft);
  width: 5rem;
  padding-top: 0.95rem !important;
}

.col-right { text-align: right; }
.lec-sub { font-size: 0.83rem; color: var(--muted); margin-top: 0.1rem; font-weight: 300; }

.slides-link {
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  color: var(--accent);
  font-weight: 400;
}

.slides-tbd {
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  color: var(--rule);
}

/* ── Assignments ── */
.assign-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.2rem;
  border: 1px solid var(--rule);
  margin-bottom: 0.7rem;
  gap: 1rem;
  transition: border-color 0.15s, background 0.15s;
}

.assign-card:hover { border-color: var(--ink); background: var(--bg2); }
.assign-card:last-child { margin-bottom: 0; }
.assign-title { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.1rem; letter-spacing: -0.01em; }
.assign-desc { font-size: 0.85rem; color: var(--muted); font-weight: 300; }
.assign-right { text-align: right; flex-shrink: 0; }
.assign-due { font-family: 'DM Mono', monospace; font-size: 0.62rem; color: var(--soft); margin-bottom: 0.35rem; }

/* ── Projects ── */
.project-intro { font-size: 0.93rem; color: var(--muted); font-weight: 300; margin-bottom: 1.8rem; max-width: 58ch; }

.project-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }

.project-card {
  border: 1px solid var(--rule);
  padding: 1rem 1.1rem;
  transition: border-color 0.15s, background 0.15s;
}

.project-card:hover { border-color: var(--accent); background: var(--tag-bg); }
.project-num { font-family: 'DM Mono', monospace; font-size: 0.58rem; color: var(--soft); margin-bottom: 0.3rem; }
.project-name { font-size: 0.93rem; font-weight: 600; margin-bottom: 0.15rem; letter-spacing: -0.01em; }
.project-desc { font-size: 0.82rem; color: var(--muted); font-weight: 300; }

/* ── References ── */
.ref-category { margin-bottom: 2rem; }

.ref-cat-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--soft);
  margin-bottom: 0.8rem;
}

.ref-item {
  display: flex;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
  font-size: 0.93rem;
}

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

.ref-tag {
  font-family: 'DM Mono', monospace;
  font-size: 0.57rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 0.12rem 0.4rem;
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.ref-sub { font-size: 0.83rem; color: var(--muted); font-weight: 300; }

/* ── Responsive ── */
@media (max-width: 600px) {
  .hero { grid-template-columns: 1fr; }
  .hero-photo { width: 120px; height: 150px; }
  .contact-grid { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .info-grid { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; gap: 0.1rem; }
  .nav-links { gap: 1rem; }
  .assign-card { flex-direction: column; align-items: flex-start; }
  .interests-grid { grid-template-columns: 1fr; }
}

/* ── Project numbered list ── */
.project-list {
  padding-left: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 0;
}

.project-list li {
  font-size: 0.95rem;
  color: var(--ink);
  font-weight: 300;
  padding: 0.1rem 0;
}

.project-list li a { color: var(--accent); }

/* ── Lecture inline references ── */
.lec-refs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.4rem;
}

.lec-refs a {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  color: var(--tag-text);
  background: var(--tag-bg);
  padding: 0.1rem 0.45rem;
  text-decoration: none;
}

.lec-refs a:hover { background: #ede9fe; text-decoration: none; }

/* ── Topic cards (project suggested topics) ── */
.topic-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.topic-card {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.topic-card:last-child { border-bottom: none; }

.topic-name {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
}

.topic-refs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.topic-refs a {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  color: var(--tag-text);
  background: var(--tag-bg);
  padding: 0.1rem 0.5rem;
  text-decoration: none;
}

.topic-refs a:hover { background: #ede9fe; text-decoration: none; }