/* ===========================
   VARIABLES & RESET
=========================== */
:root {
  --bg: #0c0e14;
  --bg2: #111420;
  --bg3: #161b2a;
  --surface: #1a2035;
  --border: rgba(120, 160, 255, 0.12);
  --accent: #7eb8f7;
  --accent2: #a78bfa;
  --accent3: #34d399;
  --text: #e8edf8;
  --text-muted: #8894b4;
  --text-dim: #4a5578;
  --gold: #f0c060;
  --font-serif: 'EB Garamond', Georgia, serif;
  --font-mono: 'DM Mono', 'Courier New', monospace;
}

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

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  line-height: 1.75;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.75; }

/* ===========================
   NAV
=========================== */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 2.5rem;
  background: rgba(12, 14, 20, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}

.nav-name {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
  letter-spacing: 0.08em;
}

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

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.nav-links a:hover { color: var(--accent); opacity: 1; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
}

/* ===========================
   HERO
=========================== */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

#quantum-canvas {
  width: 100%;
  height: 100%;
  opacity: 0.6;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem;
  max-width: 760px;
  animation: fadeUp 1.1s ease both;
}

.hero-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-content h1 {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.05;
  color: #fff;
  margin-bottom: 0.4rem;
}

.hero-sub {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent2);
  margin-bottom: 1.2rem;
  letter-spacing: 0.05em;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.hero-links {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  background: var(--accent);
  color: var(--bg);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  transition: transform 0.2s, opacity 0.2s;
}
.btn:hover { transform: translateY(-2px); opacity: 0.9; }

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid rgba(126, 184, 247, 0.4);
}
.btn-outline:hover { border-color: var(--accent); background: rgba(126, 184, 247, 0.08); }

.scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-dim);
  font-size: 1.2rem;
  animation: bounce 2.4s ease infinite;
  z-index: 1;
}

/* ===========================
   SECTIONS
=========================== */
section {
  padding: 6rem 0;
  border-bottom: 1px solid var(--border);
}
section:nth-child(odd) { background: var(--bg2); }
section:nth-child(even) { background: var(--bg3); }

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 2.5rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 400;
  font-style: italic;
  color: #fff;
  margin-bottom: 3rem;
  position: relative;
  padding-bottom: 1rem;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 48px; height: 1px;
  background: var(--accent);
}

/* ===========================
   ABOUT
=========================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-bio p {
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-size: 1.05rem;
}
.about-bio strong { color: var(--gold); }

.education-timeline h3 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1.5rem;
}

.timeline { border-left: 1px solid var(--border); padding-left: 1.5rem; }

.timeline-item {
  position: relative;
  margin-bottom: 1.8rem;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.72rem; top: 0.45rem;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

.tl-year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.2rem;
}
.tl-content strong { color: #fff; display: block; font-weight: 500; }
.tl-content span { color: var(--text-muted); font-size: 0.95rem; display: block; }
.tl-content em { color: var(--text-dim); font-size: 0.88rem; }

/* ===========================
   RESEARCH
=========================== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.research-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.8rem;
  transition: border-color 0.3s, transform 0.3s;
}
.research-card:hover {
  border-color: rgba(126, 184, 247, 0.3);
  transform: translateY(-3px);
}
.rc-icon { font-size: 2rem; margin-bottom: 0.8rem; }
.research-card h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 500;
  color: #fff;
  margin-bottom: 0.5rem;
}
.research-card p { font-size: 0.95rem; color: var(--text-muted); }

.skills-row h3 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.skill-tags span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.3rem 0.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--accent2);
}

/* ===========================
   PUBLICATIONS
=========================== */
.pub-filters {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}
.pf-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.pf-btn.active, .pf-btn:hover {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.pub-list { display: flex; flex-direction: column; gap: 1px; }

.pub-item {
  padding: 1.3rem 1.5rem;
  background: var(--surface);
  border-left: 3px solid transparent;
  transition: border-color 0.2s, background 0.2s;
}
.pub-item:hover {
  border-left-color: var(--accent);
  background: rgba(26, 32, 53, 0.8);
}
.pub-item[style*="none"] { display: none; }

.pub-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
  margin-bottom: 0.4rem;
  display: inline-block;
}
.pub-badge.journal { background: rgba(126, 184, 247, 0.15); color: var(--accent); }
.pub-badge.conference { background: rgba(167, 139, 250, 0.15); color: var(--accent2); }
.pub-badge.preprint { background: rgba(52, 211, 153, 0.15); color: var(--accent3); }

.pub-title {
  font-size: 1rem;
  color: #fff;
  font-weight: 500;
  margin-bottom: 0.3rem;
}
.pub-authors { font-size: 0.9rem; color: var(--text-muted); }

.pub-service {
  margin-top: 2rem;
  font-size: 0.88rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-style: normal;
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

/* ===========================
   AWARDS
=========================== */
.awards-grid { display: flex; flex-direction: column; gap: 1px; }

.award-item {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.1rem 1.5rem;
  background: var(--surface);
  border-left: 3px solid transparent;
  transition: border-color 0.2s;
}
.award-item:hover { border-left-color: var(--gold); }
.award-item.featured { background: rgba(240, 192, 96, 0.06); border-left-color: var(--gold); }

.award-year {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  min-width: 80px;
  flex-shrink: 0;
}
.award-item.featured .award-year { color: var(--gold); }

.award-info strong {
  display: block;
  color: #fff;
  font-weight: 500;
  font-size: 1rem;
}
.award-item.featured .award-info strong { color: var(--gold); }
.award-info span { font-size: 0.88rem; color: var(--text-muted); }

/* ===========================
   TALKS
=========================== */
.talks-list { display: flex; flex-direction: column; gap: 1px; }

.talk-item {
  padding: 1.1rem 1.5rem;
  background: var(--surface);
  border-left: 3px solid transparent;
  transition: border-color 0.2s;
}
.talk-item:hover { border-left-color: var(--accent2); }
.talk-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 0.3rem;
}
.talk-item p { font-size: 0.97rem; color: var(--text-muted); }

/* ===========================
   CONTACT
=========================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}
.contact-info p { margin-bottom: 0.8rem; color: var(--text-muted); }
.contact-info strong { color: #fff; }
.contact-info a { color: var(--accent); }

.contact-links { display: flex; flex-direction: column; gap: 0.8rem; }
.cl-item {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.9rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: border-color 0.2s, color 0.2s;
}
.cl-item:hover { border-color: var(--accent); color: var(--accent); opacity: 1; }
.cl-item span { font-size: 1.1rem; }

/* ===========================
   FOOTER
=========================== */
footer {
  padding: 2rem;
  text-align: center;
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

/* ===========================
   ANIMATIONS
=========================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(10px); }
}

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--bg);
    border-top: 1px solid var(--border);
    padding: 1rem 2rem;
    gap: 1rem;
  }
  .nav-toggle { display: block; }

  .about-grid,
  .contact-grid,
  .research-grid { grid-template-columns: 1fr; gap: 2rem; }

  section { padding: 4rem 0; }
  .container { padding: 0 1.5rem; }
}