/* =============================================
   ACADEMIC PERSONAL WEBSITE — SHARED STYLES
   Inspired by andrewng.org
   ============================================= */

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

/* ---- CSS Variables ---- */
:root {
  --bg: #fafaf8;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-muted: #6b6b6b;
  --text-light: #9a9a9a;
  --accent: #1a3a5c;
  --accent-hover: #2a5280;
  --accent-light: #e8f0f8;
  --border: #e5e5e0;
  --border-light: #f0f0ec;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.1);
  --radius: 8px;
  --nav-h: 68px;
  --font-serif: 'Lora', Georgia, serif;
  --font-sans: 'DM Sans', sans-serif;
  --max-w: 900px;
  --transition: 0.22s ease;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }
ul { list-style: none; }

/* ---- NAVBAR ---- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250,250,248,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
  display: flex;
  align-items: center;
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}
.nav-logo:hover { color: var(--accent); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 6px;
  transition: all var(--transition);
  letter-spacing: 0.01em;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-light);
}
/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  border: none;
  background: none;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---- PAGE WRAPPER ---- */
.page-wrapper {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 64px 32px 120px;
}

/* ---- SECTION HEADERS ---- */
.section-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 32px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}
.section-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

/* ---- HERO (Home page) ---- */
.hero {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 64px;
  align-items: start;
  padding: 72px 0 64px;
}
.hero-name {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 6px;
}
.hero-title {
  font-size: 1rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 24px;
  letter-spacing: 0.01em;
}
.hero-bio {
  font-size: 1.025rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 32px;
}
.hero-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.btn-outline {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}
.btn-outline:hover { background: var(--accent-light); }
.hero-photo-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.hero-photo {
  width: 220px;
  height: 260px;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: var(--shadow);
  background: var(--border);
}
.hero-photo-placeholder {
  width: 220px;
  height: 260px;
  border-radius: 12px;
  background: linear-gradient(135deg, #dce8f5 0%, #b8d0e8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}
.hero-photo-placeholder svg { opacity: 0.5; }
.social-icons {
  display: flex;
  gap: 10px;
}
.social-icons a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
  transition: all var(--transition);
}
.social-icons a:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }

/* ---- NEWS / ANNOUNCEMENTS ---- */
.news-list { display: flex; flex-direction: column; gap: 0; }
.news-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border-light);
  align-items: baseline;
}
.news-date {
  font-size: 0.8rem;
  color: var(--text-light);
  font-weight: 500;
  padding-top: 2px;
}
.news-text { font-size: 0.925rem; color: var(--text-muted); }
.news-text strong { color: var(--text); font-weight: 600; }

/* ---- ABOUT PAGE ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 64px;
  align-items: start;
}
.about-photo {
  width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow);
  background: linear-gradient(135deg, #dce8f5 0%, #b8d0e8 100%);
  aspect-ratio: 3/4;
  display: flex;
  align-items: center;
  justify-content: center;
}
.bio-block { margin-bottom: 28px; }
.bio-block p { font-size: 0.975rem; color: var(--text-muted); line-height: 1.85; margin-bottom: 14px; }
.info-list { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }
.info-row { display: flex; gap: 10px; align-items: baseline; }
.info-label { font-size: 0.8rem; font-weight: 600; color: var(--text-muted); min-width: 90px; }
.info-val { font-size: 0.9rem; color: var(--text); }

/* ---- EDUCATION / TIMELINE ---- */
.edu-list { display: flex; flex-direction: column; gap: 0; }
.edu-item {
  display: grid;
  grid-template-columns: 8px 1fr;
  gap: 20px;
  padding-bottom: 28px;
  position: relative;
}
.edu-dot-wrap { display: flex; flex-direction: column; align-items: center; }
.edu-dot {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  margin-top: 6px;
  flex-shrink: 0;
}
.edu-line {
  width: 1px;
  flex: 1;
  background: var(--border);
  margin-top: 6px;
}
.edu-degree { font-weight: 600; font-size: 0.95rem; color: var(--text); }
.edu-inst { font-size: 0.875rem; color: var(--accent); }
.edu-year { font-size: 0.8rem; color: var(--text-light); margin-top: 2px; }

/* ---- RESEARCH ---- */
.research-grid { display: flex; flex-direction: column; gap: 20px; }
.research-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.research-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
  opacity: 0;
  transition: opacity var(--transition);
}
.research-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-1px); }
.research-card:hover::before { opacity: 1; }
.research-card h3 { font-family: var(--font-serif); font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.research-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.75; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.tag {
  font-size: 0.73rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--accent-light);
  color: var(--accent);
  letter-spacing: 0.02em;
}

/* ---- PUBLICATIONS ---- */
.pub-filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
.filter-btn {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}
.filter-btn:hover, .filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}
.pub-list { display: flex; flex-direction: column; gap: 0; }
.pub-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--border-light);
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 20px;
}
.pub-year {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  padding-top: 3px;
}
.pub-title { font-weight: 600; font-size: 0.95rem; color: var(--text); margin-bottom: 4px; }
.pub-authors { font-size: 0.845rem; color: var(--text-muted); margin-bottom: 4px; }
.pub-venue { font-size: 0.82rem; color: var(--text-light); font-style: italic; margin-bottom: 10px; }
.pub-links { display: flex; gap: 8px; flex-wrap: wrap; }
.pub-link {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  transition: all var(--transition);
}
.pub-link:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }

/* ---- SUPERVISORS ---- */
.supervisor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.supervisor-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
}
.supervisor-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.supervisor-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, #dce8f5 0%, #b8d0e8 100%);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
}
.supervisor-name { font-weight: 600; font-size: 1rem; margin-bottom: 4px; }
.supervisor-role { font-size: 0.845rem; color: var(--accent); margin-bottom: 6px; }
.supervisor-inst { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 14px; }
.supervisor-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; }

/* ---- GALLERY ---- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.gallery-item {
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  background: var(--border);
  cursor: pointer;
}
.gallery-item-inner {
  width: 100%; height: 100%;
  background: linear-gradient(135deg, #dce8f5 0%, #b8d0e8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  transition: transform var(--transition);
}
.gallery-item:hover .gallery-item-inner { transform: scale(1.03); }
.gallery-caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(10,30,50,0.75));
  color: #fff;
  font-size: 0.8rem;
  padding: 20px 12px 10px;
  opacity: 0;
  transition: opacity var(--transition);
}
.gallery-item:hover .gallery-caption { opacity: 1; }
.gallery-item.wide { grid-column: span 2; }
.gallery-item.tall { grid-row: span 2; }

/* ---- BLOG ---- */
.blog-grid { display: flex; flex-direction: column; gap: 0; }
.blog-card {
  display: grid;
  grid-template-columns: 1fr;
  padding: 32px 0;
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition);
}
.blog-meta { font-size: 0.8rem; color: var(--text-light); margin-bottom: 8px; display: flex; gap: 10px; }
.blog-dot { color: var(--border); }
.blog-card h2 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
  line-height: 1.4;
  transition: color var(--transition);
}
.blog-card:hover h2 { color: var(--accent); }
.blog-card p { font-size: 0.915rem; color: var(--text-muted); line-height: 1.75; margin-bottom: 14px; }
.read-more {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.03em;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.read-more:hover { gap: 8px; }

/* ---- FOOTER ---- */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-light);
}
footer a { color: var(--text-muted); }
footer a:hover { color: var(--accent); }

/* ---- PAGE HEADER ---- */
.page-header {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}
.page-header h1 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.page-header p { font-size: 1rem; color: var(--text-muted); max-width: 600px; }

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  :root { --nav-h: 60px; }
  .page-wrapper { padding: 32px 20px 80px; }
  .nav-inner { padding: 0 20px; }
  .nav-links { display: none; position: fixed; top: var(--nav-h); left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); flex-direction: column; padding: 16px 20px; gap: 4px; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero { grid-template-columns: 1fr; gap: 32px; padding: 40px 0 48px; }
  .hero-photo-wrap { order: -1; flex-direction: row; gap: 20px; align-items: center; }
  .hero-photo-placeholder, .hero-photo { width: 120px; height: 144px; }
  .hero-name { font-size: 2rem; }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-item.wide { grid-column: span 1; }
  .supervisor-grid { grid-template-columns: 1fr 1fr; }
  .news-item { grid-template-columns: 80px 1fr; }
  .pub-item { grid-template-columns: 1fr; gap: 4px; }
  .pub-year { font-size: 0.78rem; }
}
@media (max-width: 480px) {
  .supervisor-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .gallery-item.wide, .gallery-item.tall { grid-column: span 1; grid-row: span 1; }
}