/* ── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  --bg:        #0c0c0d;
  --bg-2:      #111113;
  --bg-card:   #161618;
  --bg-card-2: #1c1c1f;
  --border:    rgba(255,255,255,0.07);
  --border-2:  rgba(255,255,255,0.12);
  --text:      #f0ede8;
  --text-2:    #9e9a93;
  --text-3:    #6b6864;
  --accent:    #e8d5a3;
  --accent-2:  #c4a55a;
  --accent-glow: rgba(200,165,90,0.15);
  --serif:     'DM Serif Display', Georgia, serif;
  --sans:      'Inter', system-ui, sans-serif;
  --mono:      'DM Mono', 'Fira Code', monospace;
  --radius:    12px;
  --radius-lg: 18px;
  --nav-h:     64px;
}

/* ── Base ───────────────────────────────────────────────── */
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ── Nav ────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  background: rgba(12,12,13,0.85);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-logo {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-right: auto;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-2);
  transition: color 0.2s;
}
.nav-link:hover, .nav-link.active { color: var(--text); }

.btn-outline-nav {
  font-family: var(--sans);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: transparent;
  border: 1px solid var(--accent-2);
  padding: 6px 16px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.btn-outline-nav:hover { background: var(--accent-glow); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  transition: 0.25s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 1.25rem 28px 1.5rem;
  gap: 1rem;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.mobile-menu.open { display: flex; }
.mobile-link {
  font-size: 1rem;
  color: var(--text-2);
  transition: color 0.2s;
}
.mobile-link:hover { color: var(--text); }

/* ── Hero ───────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--nav-h) + 80px) 28px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 700px; height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200,165,90,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 5rem;
  align-items: center;
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 1.25rem;
}

.hero-name {
  font-family: var(--serif);
  font-size: clamp(3.5rem, 7vw, 6rem);
  line-height: 1.05;
  color: var(--text);
  margin-bottom: 1.5rem;
}
.hero-name em {
  font-style: italic;
  color: var(--accent);
}

.hero-tagline {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 520px;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2.5rem;
}

.badge {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--accent-2);
  background: rgba(200,165,90,0.08);
  border: 1px solid rgba(200,165,90,0.2);
  padding: 4px 12px;
  border-radius: 2px;
}

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

.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #0c0c0d;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 12px 28px;
  border-radius: 4px;
  transition: background 0.2s, transform 0.2s;
}
.btn-primary:hover {
  background: var(--accent-2);
  transform: translateY(-2px);
}

.btn-ghost {
  display: inline-block;
  color: var(--text-2);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  padding: 12px 28px;
  border: 1px solid var(--border-2);
  border-radius: 4px;
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover {
  border-color: var(--text-2);
  color: var(--text);
}

/* Photo */
.hero-photo-wrap {
  position: relative;
  width: 260px;
  height: 260px;
  flex-shrink: 0;
}
.hero-photo {
  width: 260px; height: 260px;
  border-radius: 50%;
  overflow: hidden;
  position: relative;
  z-index: 1;
  border: 2px solid var(--border-2);
}
.hero-photo img { width: 100%; height: 100%; object-fit: cover; }
.hero-photo-ring {
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 1px solid var(--border);
  animation: ring-pulse 4s ease-in-out infinite;
}
@keyframes ring-pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.04); opacity: 1; }
}

/* Scroll hint */
.hero-scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0.35;
}
.hero-scroll-hint span {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-3);
}
.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(to bottom, var(--text-3), transparent);
  animation: scroll-drop 1.8s ease-in-out infinite;
}
@keyframes scroll-drop {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ── Sections shared ────────────────────────────────────── */
.section { padding: 110px 0; }

.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 1.5rem;
}

.section-heading {
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 3rem;
}
.section-heading em { font-style: italic; color: var(--accent); }

/* ── About ──────────────────────────────────────────────── */
.about { background: var(--bg-2); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 5rem;
  align-items: start;
}

.about-body {
  font-size: 1.05rem;
  color: var(--text-2);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.about-sidebar { display: flex; flex-direction: column; gap: 1.75rem; }

.skills-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.65rem;
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.skill-list span {
  font-size: 0.8rem;
  color: var(--text-2);
  background: var(--bg-card-2);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: 3px;
}

/* ── Projects ───────────────────────────────────────────── */
.projects { background: var(--bg); }

.projects-featured {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  transition: border-color 0.25s, transform 0.25s;
  opacity: 0;
  transform: translateY(24px);
}
.project-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.55s ease, transform 0.55s ease, border-color 0.25s, box-shadow 0.25s;
}
.project-card:hover {
  border-color: var(--border-2);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
}

.card-dark {
  background: var(--bg-card-2);
  border-color: var(--border-2);
}

.project-logo-wrap {
  height: 70px;
  display: flex;
  align-items: center;
}
.project-logo-wrap.small { height: 52px; }
.project-logo {
  max-height: 100%;
  max-width: 140px;
  object-fit: contain;
  filter: brightness(0.9);
}

.project-icon {
  font-size: 1.6rem;
  color: var(--accent-2);
  height: 52px;
  display: flex;
  align-items: center;
}

.project-body { flex: 1; display: flex; flex-direction: column; gap: 0.75rem; }

.project-body h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  color: var(--text);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.role-chip {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  color: var(--accent-2);
  background: rgba(200,165,90,0.1);
  border: 1px solid rgba(200,165,90,0.2);
  padding: 2px 8px;
  border-radius: 2px;
  font-style: normal;
}

.project-body p {
  font-size: 0.88rem;
  color: var(--text-2);
  line-height: 1.7;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: auto;
  padding-top: 0.5rem;
}
.project-tags span {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  color: var(--text-3);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 2px;
}

.project-links {
  display: flex;
  gap: 1rem;
  padding-top: 0.25rem;
}
.project-links a {
  font-size: 0.8rem;
  color: var(--accent-2);
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.project-links a:hover { color: var(--accent); }

/* ── Research strip ─────────────────────────────────────── */
.research-strip {
  background: var(--bg-2);
  padding: 80px 0;
}

.research-card {
  background: var(--bg-card);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 3rem;
  align-items: start;
  opacity: 0;
  transform: translateY(24px);
}
.research-card.visible {
  opacity: 1; transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.research-meta { display: flex; flex-direction: column; gap: 1.5rem; }

.research-icon {
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-glow);
  border: 1px solid rgba(200,165,90,0.2);
  border-radius: var(--radius);
  font-size: 1.4rem;
  color: var(--accent);
}

.research-affil {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.research-logo {
  width: 80px; height: 60px;
  object-fit: contain;
  filter: brightness(0.85) grayscale(0.3);
}
.research-affil span {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

.research-kicker {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 0.5rem;
}

.research-body h3 {
  font-family: var(--serif);
  font-size: 1.3rem;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 1rem;
}

.research-body p {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.75;
  margin-bottom: 0.75rem;
}

.research-supervisors {
  font-size: 0.82rem !important;
  color: var(--text-3) !important;
}
.research-supervisors strong { color: var(--text-2); }

/* ── Achievements ───────────────────────────────────────── */
.achievements { background: var(--bg); }

.ach-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.ach-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(24px);
  transition: border-color 0.25s, transform 0.25s;
}
.ach-card.visible {
  opacity: 1; transform: translateY(0);
  transition: opacity 0.55s ease, transform 0.55s ease, border-color 0.25s;
}
.ach-card:hover { border-color: var(--border-2); transform: translateY(-4px); }

.ach-featured {
  grid-column: span 2;
  flex-direction: row;
}
.ach-featured .ach-img-wrap { flex-shrink: 0; width: 280px; height: auto; }
.ach-featured .ach-img-wrap img { width: 100%; height: 100%; object-fit: cover; }

.ach-img-wrap {
  height: 180px;
  overflow: hidden;
  background: var(--bg-card-2);
  display: flex;
  align-items: center;
  justify-content: center;
}
.ach-img-wrap img { width: 100%; height: 100%; object-fit: cover; }
.ach-img-wrap.logo img { width: auto; height: 80%; max-width: 80%; object-fit: contain; }
.ach-img-wrap.icon { font-size: 2.2rem; color: var(--accent-2); }
.ach-img-wrap.diploma { background: var(--bg-card-2); }
.ach-img-wrap.diploma img {
  object-fit: contain;
  width: 80%;
  height: 90%;
  transform: rotate(90deg) scale(0.9);
}

.ach-body { padding: 1.4rem; display: flex; flex-direction: column; gap: 0.5rem; flex: 1; }

.ach-year {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--accent-2);
}

.ach-body h3 {
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.3;
}

.ach-body p {
  font-size: 0.84rem;
  color: var(--text-2);
  line-height: 1.65;
}

/* ── Publications ───────────────────────────────────────── */
.publications { background: var(--bg-2); }
.pubs-grid { grid-template-columns: repeat(2, 1fr); }

/* ── Contact ────────────────────────────────────────────── */
.contact { background: var(--bg-2); }

.contact-inner { max-width: 680px; }

.contact-heading { margin-bottom: 1rem; }

.contact-sub {
  font-size: 1rem;
  color: var(--text-2);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.contact-links { display: flex; flex-direction: column; gap: 1rem; }

.contact-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.95rem;
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1.25rem;
  background: var(--bg-card);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.contact-link:hover {
  border-color: var(--accent-2);
  color: var(--text);
  background: var(--bg-card-2);
}
.contact-link i { color: var(--accent-2); width: 18px; text-align: center; }

/* ── Footer ─────────────────────────────────────────────── */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 1.75rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-logo {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--text-3);
}

.footer-socials { display: flex; gap: 1rem; }
.footer-socials a {
  font-size: 1.1rem;
  color: var(--text-3);
  transition: color 0.2s;
}
.footer-socials a:hover { color: var(--text); }

/* ── Modal ──────────────────────────────────────────────── */
.modal {
  display: none;
  position: fixed; inset: 0;
  z-index: 9999;
}
.modal[aria-hidden="false"] { display: block; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
}
.modal-box {
  position: relative;
  max-width: 900px;
  margin: 3vh auto;
  background: var(--bg-card-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: 10px;
}
.modal-close {
  position: absolute; top: 8px; right: 12px;
  background: none; border: none;
  font-size: 1.6rem; color: var(--text-2);
  cursor: pointer; line-height: 1;
  transition: color 0.2s;
}
.modal-close:hover { color: var(--text); }
#cv-iframe { width: 100%; height: 90vh; border: none; }

/* ── Toast ──────────────────────────────────────────────── */
.toast {
  position: fixed;
  top: 90px; right: 24px;
  background: var(--bg-card-2);
  border: 1px solid var(--accent-2);
  color: var(--text);
  font-size: 0.85rem;
  padding: 10px 18px;
  border-radius: 6px;
  z-index: 9000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.toast.show { opacity: 1; }

/* ── Reveal animation ───────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(24px); }

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 900px) {
  .nav-links, .btn-outline-nav { display: none; }
  .hamburger { display: flex; }

  .hero-grid { grid-template-columns: 1fr; gap: 3rem; text-align: center; }
  .hero-photo-wrap { margin: 0 auto; }
  .hero-tagline { margin: 0 auto 2rem; }
  .hero-badges { justify-content: center; }
  .hero-ctas { justify-content: center; }

  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .projects-featured { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr 1fr; }
  .pubs-grid { grid-template-columns: 1fr; }
  .ach-grid { grid-template-columns: 1fr 1fr; }
  .ach-featured { grid-column: span 2; flex-direction: column; }
  .ach-featured .ach-img-wrap { width: 100%; height: 220px; }

  .research-card { grid-template-columns: 1fr; gap: 1.5rem; }
}

@media (max-width: 600px) {
  .projects-grid { grid-template-columns: 1fr; }
  .ach-grid { grid-template-columns: 1fr; }
  .ach-featured { grid-column: span 1; }
  .hero-photo-wrap { width: 200px; height: 200px; }
  .hero-photo { width: 200px; height: 200px; }
  .section { padding: 80px 0; }
}

/* ── Achievements highlight variant ─────────────────────── */
.ach-card.ach-highlight {
  border-color: rgba(200,165,90,0.25);
  background: linear-gradient(135deg, var(--bg-card) 70%, rgba(200,165,90,0.05));
}
.ach-card.ach-highlight .ach-body h3 { color: var(--accent); }

/* ── 8-card achievement grid: 3 cols, featured spans 2 ──── */
.ach-grid {
  grid-template-columns: repeat(3, 1fr);
}