/* ============================================================
   MLSA — Design System
   ============================================================ */

:root {
  /* Brand */
  --cream: #FBF1E5;
  --dusk: #CCD7D9;
  --dusk-dark: #9BADB2;
  --spring: #CED8B2;
  --clay: #DD9057;
  --peach: #FEDBB1;
  --charcoal: #4E4E4E;

  /* Semantic */
  --text-primary: #2E2E2E;
  --text-secondary: #6B6B6B;
  --text-muted: #9BADB2;
  --bg: #fff;
  --bg-alt: #FAFBFC;
  --surface: #fff;
  --border: #E8ECEE;
  --radius: 12px;
  --max-w: 1120px;
}

/* ---- Reset & Base ---- */

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

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text-primary);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
}

a { color: var(--charcoal); text-decoration: none; transition: color .2s; }
a:hover { color: var(--clay); }

img { max-width: 100%; display: block; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

section { padding: 96px 0; }
section:nth-child(even) { background: var(--bg-alt); }

/* ---- Typography ---- */

h1, h2, h3, h4 { font-weight: 600; line-height: 1.25; }
h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; margin-bottom: 12px; }
h3 { font-size: 1.125rem; }
.section-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--dusk-dark);
  margin-bottom: 8px;
}
.section-desc {
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 48px;
}

/* ---- Nav ---- */

.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 16px 0;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, padding .3s;
}
.nav.scrolled { border-bottom-color: var(--border); padding: 10px 0; }
.nav .container { display: flex; align-items: center; justify-content: space-between; }
.nav-logo { display: flex; align-items: center; gap: 10px; }
.nav-logo img { height: 32px; }
.nav-logo-text { display: flex; flex-direction: column; line-height: 1.2; gap: 0; }
.nav-logo-ml { font-weight: 600; font-size: 0.8rem; color: var(--dusk-dark); letter-spacing: 0.5px; }
.nav-logo-sa { font-weight: 600; font-size: 0.8rem; color: var(--charcoal); letter-spacing: 0.5px; }
.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a { font-size: 0.85rem; font-weight: 500; color: var(--text-secondary); }
.nav-links a:hover { color: var(--charcoal); }
.nav-burger { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-burger svg { width: 24px; height: 24px; stroke: var(--charcoal); }

/* ---- Hero ---- */

.hero {
  padding: 160px 0 96px;
  background: var(--bg);
}
.hero .container {
  display: flex;
  align-items: center;
  gap: 64px;
}
.hero-content { flex: 1; }
.hero-visual { flex: 0 0 260px; display: flex; justify-content: center; }
.hero-visual img { width: 220px; height: auto; }
.hero h1 { margin-bottom: 16px; }
.hero h1 { color: var(--charcoal); }
.hero .tagline {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 480px;
}
.hero-buttons { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all .2s;
  border: none;
  cursor: pointer;
}
.btn-primary { background: var(--charcoal); color: #fff; }
.btn-primary:hover { background: #3a3a3a; color: #fff; }
.btn-outline { background: transparent; color: var(--charcoal); border: 1.5px solid var(--border); }
.btn-outline:hover { border-color: var(--charcoal); color: var(--charcoal); }

/* ---- Cards grid ---- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform .25s, box-shadow .25s;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.card-icon {
  width: 36px; height: 36px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
  font-size: 18px;
}
.card h3 { margin-bottom: 8px; }
.card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.55; }

/* ---- Team ---- */

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.team-card {
  text-align: center;
  padding: 28px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform .25s, box-shadow .25s;
}
.team-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.team-card.pi {
  grid-column: span 1;
  border-color: var(--dusk);
}
.team-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  object-fit: cover;
  background: var(--bg-alt);
}
.team-card h3 { font-size: 0.95rem; margin-bottom: 2px; }
.team-card .role { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 8px; }
.team-card .links { display: flex; justify-content: center; gap: 8px; }
.team-card .links a {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px;
  border-radius: 6px;
  background: var(--bg-alt);
  color: var(--text-secondary);
  font-size: 13px;
  transition: background .2s, color .2s;
}
.team-card .links a:hover { background: var(--charcoal); color: #fff; }

/* ---- Projects ---- */

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform .25s, box-shadow .25s;
}
.project-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.project-card h3 { margin-bottom: 6px; }
.project-card .meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  gap: 12px;
  align-items: center;
}
.project-card .meta .badge {
  background: var(--bg-alt);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.project-card p { font-size: 0.875rem; color: var(--text-secondary); }

/* ---- Software ---- */

.software-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.software-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform .25s, box-shadow .25s;
}
.software-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.software-card h3 { font-family: 'JetBrains Mono', monospace; font-size: 1rem; margin-bottom: 4px; }
.software-card .lang { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 10px; }
.software-card p { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 14px; }
.software-card .badges { display: flex; gap: 6px; flex-wrap: wrap; }
.software-card .badges img { height: 20px; }

/* ---- Publications ---- */

.pub-list { display: flex; flex-direction: column; gap: 16px; }
.pub-item {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 20px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform .25s, box-shadow .25s;
}
.pub-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.05);
}
.pub-year {
  flex: 0 0 48px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--dusk-dark);
  font-family: 'JetBrains Mono', monospace;
}
.pub-body h3 { font-size: 0.95rem; margin-bottom: 4px; }
.pub-body .authors { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 4px; }
.pub-body .venue { font-size: 0.78rem; color: var(--text-muted); font-style: italic; }

/* ---- Contact ---- */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 { margin-bottom: 16px; }
.contact-info p { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 8px; }
.contact-info a { color: var(--clay); font-weight: 500; }
.contact-links { display: flex; gap: 12px; margin-top: 20px; }

/* ---- Footer ---- */

.footer {
  background: var(--charcoal);
  color: rgba(255,255,255,0.6);
  padding: 40px 0;
  font-size: 0.82rem;
}
.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer a { color: rgba(255,255,255,0.8); }
.footer a:hover { color: #fff; }
.footer-links { display: flex; gap: 20px; }

/* ---- Animations ---- */

.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Responsive ---- */

@media (max-width: 1024px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  section { padding: 64px 0; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }

  .nav-links { display: none; }
  .nav-burger { display: block; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(12px);
    padding: 16px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
  }

  .hero .container { flex-direction: column-reverse; text-align: center; gap: 32px; }
  .hero .tagline { margin-left: auto; margin-right: auto; }
  .hero-buttons { justify-content: center; }
  .hero-visual { flex: 0 0 auto; }

  .card-grid,
  .project-grid,
  .software-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }

  .footer .container { flex-direction: column; gap: 12px; text-align: center; }
}

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