/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #F8F5F1;
  --bg-card:      #FFFFFF;
  --text:         #1A1A1A;
  --text-muted:   #7A7A7A;
  --accent:       #B8956A;
  --accent-light: #F4EDE4;
  --border:       #E6DDD3;
  --radius:       14px;
  --shadow:       0 1px 4px rgba(0,0,0,0.05), 0 6px 20px rgba(0,0,0,0.04);
  --nav-h:        68px;
  --max-w:        1080px;
  --serif:        'Playfair Display', Georgia, serif;
  --sans:         'Inter', system-ui, sans-serif;
  --transition:   0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3 { font-family: var(--serif); font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.1rem; font-weight: 600; font-family: var(--sans); }

a { color: inherit; text-decoration: none; }
p { color: var(--text-muted); }

.section-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

/* ===== LAYOUT ===== */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; }

section { padding: 100px 0; }
section:nth-child(even) { background: var(--bg-card); }

/* ===== NAVIGATION ===== */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(248, 245, 241, 0.88);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  transition: box-shadow var(--transition);
}
nav.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.06); }

.nav-inner {
  padding: 0 3rem;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  gap: 2.2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0; right: 100%;
  height: 1.5px;
  background: var(--accent);
  transition: right var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { right: 0; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== HERO / ABOUT ===== */
#about {
  min-height: 80vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--nav-h) + 5rem);
  padding-bottom: 6rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 5rem;
  align-items: center;
  width: 100%;
}

.hero-left h1 { margin-bottom: 0.75rem; }

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-weight: 400;
}

.hero-bio {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  max-width: 520px;
  line-height: 1.8;
}

/* Contact Icons */
.contacts {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-card);
  transition: all var(--transition);
  white-space: nowrap;
}
.contact-link svg { width: 16px; height: 16px; flex-shrink: 0; }
.contact-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(184, 149, 106, 0.18);
}

/* Profile Photo */
.hero-right { display: flex; justify-content: center; }

.photo-wrap {
  width: 300px; height: 360px;
  border-radius: 160px 160px 120px 120px;
  overflow: hidden;
  background: linear-gradient(145deg, var(--accent-light) 0%, #E8D8C8 100%);
  box-shadow: 0 8px 40px rgba(184, 149, 106, 0.2), 0 2px 12px rgba(0,0,0,0.06);
  position: relative;
  flex-shrink: 0;
}
.photo-wrap img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: top center;
}
.photo-placeholder-text {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif);
  color: var(--accent);
  font-size: 0.9rem;
  text-align: center;
  padding: 1rem;
}

/* ===== SECTION HEADERS ===== */
.section-header { margin-bottom: 3.5rem; }
.section-header h2 { margin-top: 0.4rem; }

/* ===== EDUCATION ===== */
.edu-grid { display: grid; gap: 1.5rem; }

.edu-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  padding: 1.75rem 2rem 1.75rem 5.5rem;
  background-color: var(--bg-card);
  background-image: url('../images/Northwestern.png');
  background-repeat: no-repeat;
  background-size: 32px auto;
  background-position: 2rem center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}
section:nth-child(even) .edu-card { background-color: var(--bg); }
.edu-card:hover { transform: translateY(-2px); box-shadow: 0 4px 24px rgba(0,0,0,0.07); }

.edu-main { display: flex; align-items: center; gap: 1rem; }
.edu-logo-img { width: 36px; height: 36px; object-fit: contain; flex-shrink: 0; }
.edu-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.3rem; }
.edu-degree { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0.5rem; }
.edu-activities { font-size: 0.8rem; color: var(--text-muted); line-height: 1.6; }
.edu-date {
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 500;
  white-space: nowrap;
  padding-top: 0.15rem;
}

/* ===== EXPERIENCE ===== */
.exp-list { display: flex; flex-direction: column; gap: 0; }

.exp-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0 2.5rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}
.exp-item:first-child { padding-top: 0; }
.exp-item:last-child { border-bottom: none; }

.exp-meta {
  padding-top: 0.1rem;
}
.exp-date {
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 500;
  line-height: 1.5;
}
.exp-location {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.exp-content h3 { margin-bottom: 0.2rem; }
.exp-company {
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.5rem;
}
.exp-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.exp-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.75rem; }
.tag {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.25rem 0.65rem;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 50px;
}

/* ===== PROJECTS ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.project-card {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex; flex-direction: column;
}
.project-card:hover { transform: translateY(-3px); box-shadow: 0 8px 32px rgba(0,0,0,0.09); }

.project-number {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1rem;
}
.project-card h3 { font-size: 1rem; margin-bottom: 0.6rem; }
.project-card p { font-size: 0.875rem; flex-grow: 1; }
.project-links {
  display: flex; gap: 0.75rem;
  margin-top: 1.25rem;
}
.btn-outline {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.4rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: 50px;
  color: var(--text-muted);
  transition: all var(--transition);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.photo-hint { font-size: 0.75rem; margin-top: 0.5rem; display: block; opacity: 0.7; }
.footer-email { color: var(--accent); }

/* ===== FOOTER ===== */
#publications { padding-bottom: 48px; }

footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}
footer p { font-size: 0.83rem; }

/* ===== PAGE LINKS (for interests / gallery nav) ===== */
.page-nav {
  display: flex;
  gap: 1rem;
  margin-top: 3rem;
  flex-wrap: wrap;
}
.page-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  background: var(--text);
  color: white;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: opacity var(--transition), transform var(--transition);
}
.page-btn:hover { opacity: 0.85; transform: translateY(-1px); }
.page-btn.warm { background: var(--accent); color: white; }
.page-btn.secondary {
  background: var(--accent-light);
  color: var(--accent);
  border: 2px solid var(--accent);
}
.page-btn.secondary:hover {
  background: var(--accent);
  color: white;
}

/* ===== INTERESTS PAGE ===== */
.interests-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}
.interest-card {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.interest-icon { font-size: 2rem; margin-bottom: 1rem; }
.interest-card h3 { font-size: 0.95rem; margin-bottom: 0.5rem; }
.interest-card p { font-size: 0.85rem; }

/* ===== GALLERY PAGE ===== */
.gallery-grid {
  columns: 3;
  column-gap: 1.25rem;
}
.gallery-item {
  break-inside: avoid;
  margin-bottom: 1.25rem;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--accent-light);
  position: relative;
  cursor: pointer;
}
.gallery-item img {
  width: 100%;
  display: block;
  transition: transform 0.6s ease;
}
.gallery-item::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(26, 26, 26, 0);
  transition: background 0.4s ease;
  border-radius: var(--radius);
}
.gallery-item:hover::after { background: rgba(26, 26, 26, 0.08); }
.gallery-item:hover img { transform: scale(1.04); }
.gallery-placeholder {
  aspect-ratio: var(--aspect, 4/3);
  background: linear-gradient(135deg, var(--accent-light) 0%, #E8D8C8 100%);
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 500;
}
.gallery-placeholder.tall { --aspect: 3/4; }
.gallery-placeholder.wide { --aspect: 16/9; }

/* ===== SKILLS ===== */
.skills-grid {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.skill-group { display: flex; flex-direction: column; gap: 0.75rem; }

.skill-category {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  min-width: 140px;
}

.skill-row {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border);
}
.skill-row:last-child { border-bottom: none; padding-bottom: 0; }

.skill-pills { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.skill-pill {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: 50px;
  background: var(--bg-card);
  color: var(--text);
  transition: all var(--transition);
}
section:nth-child(even) .skill-pill { background: var(--bg); }
.skill-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== PUBLICATIONS ===== */
.pub-list { display: flex; flex-direction: column; gap: 0; }

.pub-item {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 0 1.75rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}
.pub-item:first-child { padding-top: 0; }
.pub-item:last-child { border-bottom: none; }

.pub-year {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  padding-top: 0.15rem;
  line-height: 1.4;
}

.pub-title {
  font-size: 0.975rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.45;
  margin-bottom: 0.35rem;
}
.pub-title a { color: inherit; border-bottom: 1px solid var(--border); transition: border-color var(--transition); }
.pub-title a:hover { border-color: var(--accent); color: var(--accent); }

.pub-authors {
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  line-height: 1.55;
}
.pub-authors strong { color: var(--text); font-weight: 600; }

.pub-venue {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 0.6rem;
}

.pub-links { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.pub-link {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.65rem;
  border: 1.5px solid var(--border);
  border-radius: 50px;
  color: var(--text-muted);
  transition: all var(--transition);
}
.pub-link:hover { border-color: var(--accent); color: var(--accent); }

/* ===== SCROLL ANIMATIONS ===== */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.fade-up.visible { opacity: 1; transform: none; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: var(--nav-h); left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); padding: 1.5rem 2rem; gap: 1.25rem; }
  .nav-links.open { display: flex; }
  .hamburger { display: flex; }

  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-right { order: -1; }
  .photo-wrap { width: 220px; height: 270px; }

  .exp-item { grid-template-columns: 1fr; gap: 0.5rem; }
  .exp-meta { display: flex; gap: 1rem; align-items: center; }

  .skill-row { flex-direction: column; gap: 0.6rem; }
  .skill-category { min-width: unset; }

  .pub-item { grid-template-columns: 44px 1fr; gap: 0 1rem; }

  .gallery-grid { columns: 2; }

  section { padding: 72px 0; }
}

@media (max-width: 480px) {
  .gallery-grid { columns: 1; }
  .edu-card { grid-template-columns: 1fr; }
}