/* ── Container ── */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 2rem);
  position: relative;
  z-index: 1;
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* ── Sections ── */
.section-deep,
.section-surface {
  position: relative;
  padding: var(--section-pad) 0;
  overflow: hidden;
  z-index: 1;
}

.section-deep    { background-color: var(--bg-deep); }
.section-surface { background-color: var(--bg-surface); }

.section-header {
  margin-bottom: 3.5rem;
}

/* ── Navbar ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  transition: background 0.4s var(--ease-in-out),
              backdrop-filter 0.4s var(--ease-in-out),
              box-shadow 0.4s var(--ease-in-out);
}

.navbar.scrolled {
  background: rgba(7, 13, 26, 0.88);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 1px 0 var(--bg-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 clamp(1.5rem, 5vw, 3rem);
  max-width: 1400px;
  margin: 0 auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, 2rem);
}

.nav-social {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-toggle { display: none; }

/* ── Hero ── */
.section-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: transparent;
  padding-top: var(--nav-h);
  overflow: hidden;
  z-index: 1;
}

.hero-inner {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 4rem clamp(1.5rem, 4vw, 4rem);
  position: relative;
  z-index: 1;
}

.hero-content {
  display: flex;
  flex-direction: column;
}

@media (min-width: 960px) {
  .hero-content {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    column-gap: clamp(2rem, 5vw, 5rem);
    align-items: center;
  }
  .hero-content > .hero-photo {
    grid-column: 2;
    grid-row: 1 / span 6;
    align-self: center;
    justify-self: center;
    width: 240px;
    height: 240px;
    margin-bottom: 0;
  }
  .hero-content > .hero-badge,
  .hero-content > .hero-name,
  .hero-content > .hero-typewriter,
  .hero-content > .hero-bio,
  .hero-content > .hero-ctas,
  .hero-content > .hero-social-row { grid-column: 1; }
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-social-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-muted);
  font-size: 1.2rem;
  animation: bounce 2s ease-in-out infinite;
  z-index: 2;
}

/* ── Research grid ── */
.research-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

/* ── Projects grid ── */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.project-card--featured {
  grid-column: 1 / -1;
}

/* ── Awards grid ── */
.awards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  max-width: 900px;
}

/* ── Teaching grid ── */
.teaching-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2.5rem;
  align-items: start;
}

/* ── CV skills ── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

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

.contact-links-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* ── Footer ── */
.footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--bg-border);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 2rem;
}

/* ── Timeline ── */
.timeline-wrap {
  position: relative;
  padding: 2rem 0;
  margin-bottom: 3rem;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--bg-border);
  transform: translateX(-50%);
}

.timeline-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: linear-gradient(to bottom, var(--accent), var(--accent-dim));
  transition: height 1.4s var(--ease-out-expo);
}

.timeline-line.animated::after {
  height: 100%;
}

.timeline-entry {
  display: flex;
  width: 50%;
  padding: 1.5rem 2.5rem;
  position: relative;
}

.timeline-entry--left  { justify-content: flex-end; }
.timeline-entry--right { justify-content: flex-start; margin-left: 50%; }

.timeline-dot {
  position: absolute;
  top: 2rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-surface);
  box-shadow: 0 0 12px var(--accent-glow);
}

.timeline-entry--left  .timeline-dot { right: -7px; }
.timeline-entry--right .timeline-dot { left: -7px; }

.timeline-card {
  background: var(--bg-raised);
  border: 1px solid var(--bg-border);
  border-radius: var(--card-radius);
  padding: 1.25rem 1.5rem;
  max-width: 340px;
  width: 100%;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.timeline-card:hover {
  border-color: var(--accent-dim);
  box-shadow: var(--shadow-hover);
}

.timeline-bullets {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.timeline-bullets li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding-left: 1rem;
  position: relative;
}

.timeline-bullets li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.7em;
  top: 0.15em;
}

/* ── Languages ── */
.languages-row {
  display: flex;
  gap: 2rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.language-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.language-flag { font-size: 1.5rem; }
.language-name {
  font-family: var(--font-body);
  color: var(--text-primary);
  font-weight: 500;
}

.cv-download-wrap {
  text-align: center;
  padding-top: 1rem;
}

/* ── Scholar CTA ── */
.scholar-cta {
  text-align: center;
  margin-top: 2.5rem;
}

/* ── Publication list ── */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Expertise row ── */
.expertise-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ── Teaching courses ── */
.teaching-courses {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* ── Nav overlay (mobile) ── */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(7, 13, 26, 0.6);
  backdrop-filter: blur(4px);
  z-index: 998;
}

.nav-overlay.active { display: block; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .research-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .awards-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .hero-inner {
    padding: 3rem clamp(1.5rem, 5vw, 2rem);
  }

  .projects-grid { grid-template-columns: 1fr; }
  .project-card--featured { grid-column: auto; }
  .awards-grid { grid-template-columns: 1fr; }
  .teaching-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-links-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }

  /* Timeline stacks left */
  .timeline-line { left: 1.5rem; }
  .timeline-entry { width: 100%; padding: 1rem 1rem 1rem 4rem; }
  .timeline-entry--left  { justify-content: flex-start; }
  .timeline-entry--right { margin-left: 0; justify-content: flex-start; }
  .timeline-entry--left  .timeline-dot { right: auto; left: -7px; }
  .timeline-entry--right .timeline-dot { left: -7px; }
  .timeline-card { max-width: 100%; }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(300px, 80vw);
    background: var(--bg-surface);
    border-left: 1px solid var(--bg-border);
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: 3rem 2rem;
    gap: 2rem;
    z-index: 999;
    transform: translateX(100%);
    transition: transform 0.35s var(--ease-out-expo);
  }

  .nav-links.open {
    display: flex;
    transform: translateX(0);
  }

  .nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    z-index: 1001;
    position: relative;
  }

  .nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: transform 0.3s ease, opacity 0.3s ease;
    transform-origin: center;
  }

  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .nav-social { display: none; }
}

@media (max-width: 480px) {
  .hero-ctas { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .languages-row { gap: 1rem; }
  .contact-links-grid { grid-template-columns: 1fr; }
}