/* ============================================================
   Tuan-Anh Vu — Faculty Profile
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Lora:ital,wght@0,400;0,600;1,400&display=swap');

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

:root {
  --text:         #111827;
  --muted:        #4b5563;
  --subtle:       #9ca3af;
  --accent:       #2563eb;
  --accent-light: #eff6ff;
  --accent-mid:   #bfdbfe;
  --green:        #059669;
  --green-light:  #d1fae5;
  --amber:        #d97706;
  --amber-light:  #fef3c7;
  --border:       #e5e7eb;
  --border-light: #f3f4f6;
  --bg:           #ffffff;
  --bg-alt:       #f9fafb;
  --hero-bg:      #0f172a;
  --hero-text:    #f8fafc;
  --hero-muted:   #94a3b8;
  --sans:         'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --serif:        'Lora', Georgia, serif;
  --max-w:        1032px;
  --shadow-sm:    0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.05);
  --shadow:       0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-hover: 0 8px 24px rgba(0,0,0,0.12), 0 4px 8px rgba(0,0,0,0.06);
  --radius:       8px;
  --radius-sm:    5px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

/* ============================================================
   NAV
   ============================================================ */
nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(15, 23, 42, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.875rem;
  padding-bottom: 0.875rem;
}

.nav-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--hero-text);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.82rem;
  color: var(--hero-muted);
  font-weight: 400;
  padding: 0.3rem 0.75rem;
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
}
.nav-links a:hover {
  color: #fff;
  background: rgba(255,255,255,0.08);
  text-decoration: none;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  background: var(--hero-bg);
  background-image:
    radial-gradient(ellipse at 70% 50%, rgba(37,99,235,0.15) 0%, transparent 60%),
    radial-gradient(ellipse at 10% 80%, rgba(139,92,246,0.1) 0%, transparent 50%);
  padding: 5rem 0 4.5rem;
  color: var(--hero-text);
}

.hero-inner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2.75rem;
  align-items: center;
}

.hero-photo-wrap {
  position: relative;
  flex-shrink: 0;
}

.hero-photo {
  width: 148px;
  height: 148px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  border: 3px solid rgba(255,255,255,0.15);
  box-shadow: 0 0 0 1px rgba(37,99,235,0.5), var(--shadow);
}

.hero-status {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background: #10b981;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--hero-bg);
}

.hero-name {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: #fff;
}

.hero-name-vi {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1rem;
  font-weight: 400;
  color: var(--hero-muted);
  margin-top: 0.2rem;
  display: block;
}

.hero-role {
  margin-top: 0.75rem;
  font-size: 0.97rem;
  color: var(--hero-muted);
  line-height: 1.6;
}
.hero-role strong { color: #e2e8f0; font-weight: 500; }

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.1rem;
}

.hero-tag {
  font-size: 0.74rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  background: rgba(255,255,255,0.07);
  color: var(--hero-muted);
  border: 1px solid rgba(255,255,255,0.1);
  letter-spacing: 0.01em;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.4rem;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.83rem;
  font-weight: 500;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s;
  text-decoration: none;
}

.hero-links a.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
}
.hero-links a.btn-primary:hover {
  background: #1d4ed8;
  border-color: #1d4ed8;
}

.hero-links a.btn-ghost {
  color: #cbd5e1;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.05);
}
.hero-links a.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  color: #fff;
  border-color: rgba(255,255,255,0.25);
}

/* ---- Job market banner ---- */
.job-banner {
  margin-top: 1.6rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.0rem;
  color: #fde68a;
  border: 1px solid rgba(251,191,36,0.3);
  background: rgba(251,191,36,0.07);
  padding: 0.4rem 0.9rem;
  border-radius: 100px;
  font-weight: 500;
}
.job-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #fbbf24;
  flex-shrink: 0;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.75rem;
}

section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border);
}
section:last-of-type { border-bottom: none; }

.section-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.section-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 1.75rem;
  line-height: 1.2;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 7fr 3fr;
  gap: 3rem;
  align-items: start;
}

.bio p {
  font-size: 0.965rem;
  color: var(--muted);
  margin-bottom: 0.85rem;
}
.bio p:last-child { margin-bottom: 0; }
.bio strong { color: var(--text); font-weight: 600; }

/* Quick facts sidebar */
.sidebar {}

.sidebar-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  margin-bottom: 1rem;
}
.sidebar-card:last-child { margin-bottom: 0; }

.sidebar-card-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--subtle);
  margin-bottom: 0.85rem;
}

.fact-row {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.fact {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.4;
}

.fact-icon {
  width: 16px;
  height: 16px;
  margin-top: 1px;
  flex-shrink: 0;
  opacity: 0.5;
}

/* ============================================================
   RESEARCH INTERESTS
   ============================================================ */
.interest-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
}

.interest-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  transition: box-shadow 0.2s, border-color 0.2s, transform 0.2s;
}
.interest-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--accent-mid);
  transform: translateY(-1px);
}

.interest-icon {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  line-height: 1;
}

.interest-card h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.3rem;
  line-height: 1.3;
}

.interest-card p {
  font-size: 0.79rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ============================================================
   NEWS
   ============================================================ */
.news-list { display: flex; flex-direction: column; max-height: 320px; overflow-y: auto; padding-right: 0.5rem; scrollbar-width: thin; scrollbar-color: var(--border) transparent; }

.news-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--border-light);
  align-items: baseline;
}
.news-item:first-child { padding-top: 0; }
.news-item:last-child { border-bottom: none; padding-bottom: 0; }

.news-date {
  font-size: 0.75rem;
  color: var(--subtle);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  padding-top: 0.1rem;
}

.news-text {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.55;
}
.news-text strong { color: var(--text); font-weight: 600; }
.news-text a { color: var(--accent); }

/* ============================================================
   PUBLICATIONS
   ============================================================ */
.pub-filter {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
}

.pub-filter-btn {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3rem 0.8rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}
.pub-filter-btn:hover,
.pub-filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.pub-list { display: flex; flex-direction: column; gap: 0; }

.pub-item {
  display: grid;
  grid-template-columns: 72px 120px 1fr;
  gap: 0 0.75rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--border-light);
  transition: background 0.15s;
}
.pub-item:last-child { border-bottom: none; padding-bottom: 0; }
.pub-item:first-child { padding-top: 0; }
.pub-item:hover { background: var(--bg-alt); margin: 0 -1rem; padding-left: 1rem; padding-right: 1rem; border-radius: var(--radius-sm); }

.pub-year {
  font-size: 0.76rem;
  color: var(--subtle);
  font-weight: 500;
  padding-top: 0.2rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.pub-year-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--border-light);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
}

.pub-thumb {
  align-self: start;
  padding-top: 0.1rem;
}
.pub-thumb img,
.pub-thumb-placeholder {
  width: 100%;
  height: 76px;
  border-radius: var(--radius-sm);
  display: block;
  object-fit: cover;
}
.pub-thumb-placeholder {
  background: var(--bg-alt);
  border: 1px solid var(--border);
}

.pub-content {}

.pub-title {
  font-size: 0.935rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.45;
  margin-bottom: 0.25rem;
}

.pub-authors {
  font-size: 0.815rem;
  color: var(--muted);
  line-height: 1.55;
  margin-bottom: 0.45rem;
}
.pub-authors .me {
  font-weight: 600;
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 2px;
}

.pub-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.55rem;
}

.venue-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-light);
  padding: 0.2rem 0.65rem;
  border-radius: 100px;
  border: 1px solid var(--accent-mid);
}

.badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.18rem 0.55rem;
  border-radius: 100px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge-oral     { background: var(--amber-light); color: var(--amber); border: 1px solid #fde68a; }
.badge-new      { background: var(--green-light);  color: var(--green); border: 1px solid #a7f3d0; }
.badge-ijcv     { background: #f5f3ff; color: #6d28d9; border: 1px solid #ddd6fe; }
.badge-preprint { background: #f3f4f6; color: #6b7280; border: 1px solid #e5e7eb; }

.pub-links {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.pub-links a {
  font-size: 0.775rem;
  font-weight: 500;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: color 0.12s;
}
.pub-links a:hover { color: var(--accent); text-decoration: none; }

/* ============================================================
   TEACHING & MENTORING
   ============================================================ */
.section-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.subsection-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--subtle);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

.course-list { display: flex; flex-direction: column; gap: 0.15rem; }

.course-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  gap: 0.5rem;
  transition: background 0.12s;
}
.course-item:hover { background: var(--bg-alt); }

.course-name {
  font-size: 0.86rem;
  color: var(--text);
  font-weight: 500;
  line-height: 1.4;
}

.course-meta {
  font-size: 0.75rem;
  color: var(--subtle);
  white-space: nowrap;
  flex-shrink: 0;
}

.mentee-list { display: flex; flex-direction: column; gap: 0.6rem; }

.mentee-item {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: background 0.12s;
}
.mentee-item:hover { background: var(--bg-alt); }

.mentee-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-mid), var(--accent-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}

.mentee-name {
  font-size: 0.855rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}

.mentee-role {
  font-size: 0.775rem;
  color: var(--muted);
}

.ug-mentee-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 0.4rem 0.75rem;
}
.ug-mentee-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  width: 72px;
  text-align: center;
}
.ug-mentee-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-mid), var(--accent-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}
.ug-me  { background: linear-gradient(135deg, #bbf7d0, #d1fae5); color: var(--green); }
.ug-ce  { background: linear-gradient(135deg, #fde68a, #fef3c7); color: var(--amber); }
.ug-math { background: linear-gradient(135deg, #e9d5ff, #f3e8ff); color: #7c3aed; }
.ug-dt  { background: linear-gradient(135deg, #fecaca, #fee2e2); color: #dc2626; }
.ug-mentee-name {
  font-size: 0.72rem;
  color: var(--muted);
  line-height: 1.3;
  word-break: break-word;
}

.mentee-major-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid var(--accent-mid);
  padding: 0.15rem 0.6rem;
  border-radius: 100px;
  display: inline-block;
  margin: 0.5rem 0 0.25rem 0.75rem;
  letter-spacing: 0.01em;
}

/* ============================================================
   SERVICE
   ============================================================ */
.service-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.service-block { }

.service-item {
  display: flex;
  gap: 0.75rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border-light);
  align-items: flex-start;
}
.service-item:last-child { border-bottom: none; }

.service-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-mid);
  margin-top: 0.5rem;
  flex-shrink: 0;
}

.service-text { font-size: 0.855rem; color: var(--muted); line-height: 1.5; }
.service-text strong { color: var(--text); font-weight: 600; }

/* ============================================================
   AWARDS
   ============================================================ */
.award-list { display: flex; flex-direction: column; }

.award-item {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border-light);
  align-items: flex-start;
}
.award-item:last-child { border-bottom: none; }

.award-year {
  font-size: 0.76rem;
  color: var(--subtle);
  font-weight: 600;
  padding-top: 0.15rem;
  font-variant-numeric: tabular-nums;
}

.award-text {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.5;
}
.award-text strong { color: var(--text); font-weight: 600; }

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background: var(--hero-bg);
  color: var(--hero-muted);
  padding: 2.5rem 0;
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-text { font-size: 0.8rem; }
.footer-text a { color: var(--hero-muted); }
.footer-text a:hover { color: #fff; text-decoration: none; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 700px) {
  .hero-inner          { grid-template-columns: 1fr; gap: 1.5rem; }
  .hero-photo          { width: 110px; height: 110px; }
  .hero-name           { font-size: 1.7rem; }
  .about-grid          { grid-template-columns: 1fr; gap: 2rem; }
  .interest-grid       { grid-template-columns: 1fr; }
  .section-grid-2      { grid-template-columns: 1fr; }
  .service-grid        { grid-template-columns: 1fr; }
  .pub-item            { grid-template-columns: 1fr; }
  .pub-year-badge      { display: none; }
  .pub-thumb           { display: none; }
  .news-item           { grid-template-columns: 1fr; gap: 0.2rem; }
  .award-item          { grid-template-columns: 1fr; }
  footer .container    { flex-direction: column; gap: 0.5rem; text-align: center; }
  nav .container       { gap: 0.5rem; }
  .nav-links           { gap: 0; }
  .nav-links a         { padding: 0.3rem 0.5rem; }
}