/* ══════════════════════════════════════════
   VARIABLES & RESET
══════════════════════════════════════════ */
:root {
  --bg:        #0a0a0f;
  --bg-alt:    #111118;
  --surface:   #1a1a24;
  --border:    rgba(245,158,11,.12);
  --accent:    #f59e0b;
  --accent2:   #a78bfa;
  --text:      #e8e4df;
  --muted:     #8a8490;
  --heading:   #faf5ef;
  --card-bg:   rgba(26,26,36,.7);
  --nav-h:     68px;
  --radius:    12px;
  --shadow:    0 8px 40px rgba(0,0,0,.55);
  --transition: .35s cubic-bezier(.4,0,.2,1);
  --glow:      rgba(245,158,11,.08);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Source Sans 3', sans-serif;
  font-weight: 300;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  overflow-x: hidden;
}

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

/* ── CANVAS ── */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .3;
}

/* ══════════════════════════════════════════
   NAVBAR
══════════════════════════════════════════ */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 900;
  transition: background var(--transition), box-shadow var(--transition);
}
#navbar.scrolled {
  background: rgba(10,10,15,.94);
  backdrop-filter: blur(18px);
  box-shadow: 0 1px 0 var(--border);
}
.nav-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: 'Playfair Display', serif;
  font-weight: 900;
  font-size: 1.5rem;
  color: var(--heading);
  letter-spacing: -.02em;
}
.dot { color: var(--accent); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.8rem;
}
.nav-links a {
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .05em;
  color: var(--muted);
  text-transform: uppercase;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text); }
.nav-links .nav-cta {
  color: var(--accent);
  border: 1px solid rgba(245,158,11,.3);
  padding: .35rem .9rem;
  border-radius: 6px;
  transition: background var(--transition), color var(--transition);
}
.nav-links .nav-cta:hover {
  background: rgba(245,158,11,.12);
  color: var(--accent);
}

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

/* Mobile menu */
.mobile-menu {
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  background: rgba(10,10,15,.97);
  backdrop-filter: blur(20px);
  z-index: 800;
  transform: translateY(-110%);
  transition: transform var(--transition);
  border-bottom: 1px solid var(--border);
}
.mobile-menu.open { transform: translateY(0); }
.mobile-menu ul { list-style: none; padding: 1.5rem 2rem; }
.mobile-menu li { border-bottom: 1px solid var(--border); }
.mobile-menu a {
  display: block;
  padding: .9rem 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
}

/* ══════════════════════════════════════════
   HERO
══════════════════════════════════════════ */
#hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 2rem;
}
.hero-content {
  max-width: 1140px;
  margin: 0 auto;
  width: 100%;
  padding-top: var(--nav-h);
}
.hero-tag { margin-bottom: 2rem; }
.tag-chip {
  display: inline-block;
  background: rgba(245,158,11,.07);
  border: 1px solid rgba(245,158,11,.25);
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: .76rem;
  padding: .4rem 1.1rem;
  border-radius: 100px;
  letter-spacing: .04em;
}
.hero-name {
  font-family: 'Playfair Display', serif;
  font-weight: 900;
  font-size: clamp(3.2rem, 9vw, 7.5rem);
  line-height: 1.0;
  color: var(--heading);
  letter-spacing: -.02em;
  margin-bottom: 1.5rem;
}
.hero-name .accent {
  color: transparent;
  background: linear-gradient(135deg, var(--accent), #fbbf24);
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-sub {
  font-size: clamp(.95rem, 2vw, 1.15rem);
  color: var(--muted);
  font-weight: 300;
  line-height: 1.8;
  max-width: 540px;
  margin-bottom: 2.5rem;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  background: linear-gradient(135deg, var(--accent), #d97706);
  color: #0a0a0f;
  font-weight: 600;
  font-size: .88rem;
  padding: .8rem 2rem;
  border-radius: 8px;
  letter-spacing: .02em;
  transition: opacity var(--transition), transform var(--transition);
}
.btn-primary:hover { opacity: .9; transform: translateY(-2px); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: .88rem;
  font-weight: 500;
  padding: .8rem 2rem;
  border-radius: 8px;
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .6rem;
  color: var(--muted);
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: .3; }
  50% { opacity: 1; }
}

/* ══════════════════════════════════════════
   SECTIONS
══════════════════════════════════════════ */
.section {
  position: relative;
  z-index: 1;
  padding: 7rem 2rem;
}
.section-alt { background: var(--bg-alt); }

.section-inner {
  max-width: 1140px;
  margin: 0 auto;
}
.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem;
  color: var(--accent);
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}
.section-title {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--heading);
  line-height: 1.2;
  letter-spacing: -.01em;
  margin-bottom: 3rem;
}

/* ══════════════════════════════════════════
   BIO
══════════════════════════════════════════ */
.bio-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
.bio-text p {
  color: var(--muted);
  margin-bottom: 1.2rem;
  font-size: 1.02rem;
}
.bio-text p strong { color: var(--text); font-weight: 500; }

.bio-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: .4rem;
  transition: border-color var(--transition), transform var(--transition);
}
.stat-card:hover {
  border-color: rgba(245,158,11,.3);
  transform: translateY(-3px);
}
.stat-num {
  font-family: 'Playfair Display', serif;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -.02em;
}
.stat-label {
  font-size: .8rem;
  color: var(--muted);
  line-height: 1.3;
}

/* ══════════════════════════════════════════
   TIMELINE
══════════════════════════════════════════ */
.timeline {
  position: relative;
  padding-left: 2rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}
.timeline-item {
  position: relative;
  padding-bottom: 2.5rem;
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 2rem;
  align-items: start;
}
.tl-marker {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 2px solid var(--muted);
  transform: translateX(-4px);
  transition: border-color var(--transition);
}
.accent-marker { border-color: var(--accent); }
.timeline-item:hover .tl-marker { border-color: var(--accent); }

.tl-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: .73rem;
  color: var(--muted);
  padding-top: .25rem;
  letter-spacing: .03em;
}
.tl-content h3 {
  font-family: 'Playfair Display', serif;
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--heading);
  margin-bottom: .3rem;
}
.tl-org {
  font-size: .88rem;
  color: var(--accent);
  margin-bottom: .5rem;
}
.tl-desc {
  font-size: .88rem;
  color: var(--muted);
  line-height: 1.6;
}

/* Tags */
.tag-list { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .7rem; }
.tag {
  font-size: .73rem;
  font-family: 'JetBrains Mono', monospace;
  background: rgba(245,158,11,.07);
  border: 1px solid rgba(245,158,11,.2);
  color: var(--accent);
  padding: .2rem .7rem;
  border-radius: 100px;
}
.role-badge {
  display: inline-block;
  font-size: .66rem;
  font-family: 'JetBrains Mono', monospace;
  background: rgba(167,139,250,.12);
  border: 1px solid rgba(167,139,250,.3);
  color: var(--accent2);
  padding: .15rem .6rem;
  border-radius: 4px;
  vertical-align: middle;
  margin-left: .5rem;
}

/* ══════════════════════════════════════════
   PROJECTS
══════════════════════════════════════════ */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.project-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  opacity: 0;
  transition: opacity var(--transition);
}
.project-card:hover {
  border-color: rgba(245,158,11,.25);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,.3);
}
.project-card:hover::after { opacity: 1; }

.project-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(245,158,11,.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 1rem;
}
.project-card h3 {
  font-family: 'Playfair Display', serif;
  font-weight: 600;
  font-size: 1rem;
  color: var(--heading);
  margin-bottom: .3rem;
  line-height: 1.4;
}
.project-period {
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem;
  color: var(--muted);
  margin-bottom: .6rem;
}
.project-card p {
  font-size: .88rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ══════════════════════════════════════════
   PUBLICATIONS
══════════════════════════════════════════ */
.pub-list { display: flex; flex-direction: column; gap: 1rem; }

.pub-card {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto auto;
  gap: .5rem 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1.8rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.pub-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--accent), var(--accent2));
  opacity: 0;
  transition: opacity var(--transition);
}
.pub-card:hover {
  border-color: rgba(245,158,11,.3);
  transform: translateX(4px);
  box-shadow: var(--shadow);
}
.pub-card:hover::before { opacity: 1; }

.pub-meta {
  grid-column: 1;
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}
.pub-year {
  font-family: 'JetBrains Mono', monospace;
  font-size: .75rem;
  color: var(--muted);
}
.pub-venue {
  font-size: .78rem;
  font-weight: 500;
  color: var(--accent);
  background: rgba(245,158,11,.08);
  border: 1px solid rgba(245,158,11,.2);
  padding: .15rem .65rem;
  border-radius: 4px;
}
.pub-title {
  grid-column: 1;
  font-family: 'Playfair Display', serif;
  font-weight: 600;
  font-size: 1rem;
  color: var(--heading);
  line-height: 1.4;
}
.pub-authors {
  grid-column: 1;
  font-size: .82rem;
  color: var(--muted);
}
.pub-authors strong { color: var(--accent); font-weight: 500; }
.pub-arrow {
  grid-column: 2;
  grid-row: 1 / 4;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: .9rem;
  transition: color var(--transition), transform var(--transition);
  padding-left: .5rem;
}
.pub-card:hover .pub-arrow {
  color: var(--accent);
  transform: translate(2px, -2px);
}

/* ══════════════════════════════════════════
   SKILLS
══════════════════════════════════════════ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}
.skill-group {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
}
.skill-group:hover {
  border-color: rgba(245,158,11,.25);
  transform: translateY(-3px);
}
.skill-group h3 {
  font-family: 'Playfair Display', serif;
  font-weight: 600;
  font-size: .95rem;
  color: var(--heading);
  margin-bottom: .8rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.skill-group h3 i {
  color: var(--accent);
  font-size: .9rem;
}

/* ══════════════════════════════════════════
   CONTACT
══════════════════════════════════════════ */
.contact-section {
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(245,158,11,.05), transparent);
}
.contact-inner { text-align: center; }
.contact-inner .section-label { justify-content: center; display: block; }
.contact-inner .section-title { margin-left: auto; margin-right: auto; }
.contact-sub {
  color: var(--muted);
  font-size: 1.02rem;
  margin-bottom: 3rem;
}
.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.contact-link {
  display: flex;
  align-items: center;
  gap: .75rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: .9rem 1.6rem;
  border-radius: 10px;
  font-size: .88rem;
  font-weight: 500;
  color: var(--text);
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}
.contact-link:hover {
  border-color: rgba(245,158,11,.4);
  color: var(--accent);
  transform: translateY(-3px);
}
.contact-link i { font-size: 1.1rem; color: var(--accent); }

/* ══════════════════════════════════════════
   FOOTER
══════════════════════════════════════════ */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  background: var(--bg);
  position: relative;
  z-index: 1;
}
.footer-inner {
  max-width: 1140px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
footer p {
  color: var(--muted);
  font-size: .82rem;
}

/* ══════════════════════════════════════════
   SCROLL REVEAL
══════════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ══════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════ */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .burger { display: flex; }
  .bio-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .timeline-item { grid-template-columns: 1fr; gap: .5rem; }
  .tl-date { font-size: .7rem; }
  .pub-card { grid-template-columns: 1fr; }
  .pub-arrow { display: none; }
  .projects-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .hero-name { font-size: clamp(2.6rem, 13vw, 4.5rem); }
  .section { padding: 5rem 1.2rem; }
  .bio-stats { grid-template-columns: 1fr 1fr; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
}