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

:root {
  --bg:        #070b14;
  --bg2:       #0d1220;
  --cyan:      #00d4ff;
  --cyan-dim:  rgba(0, 212, 255, 0.12);
  --cyan-glow: rgba(0, 212, 255, 0.25);
  --text:      #e2e8f0;
  --text-muted:#7a8fa6;
  --border:    rgba(0, 212, 255, 0.12);
  --card-bg:   rgba(13, 18, 32, 0.75);
  --radius:    10px;
  --font:      'Inter', sans-serif;
  --mono:      'JetBrains Mono', monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

/* ============================================================
   Canvas background
   ============================================================ */
#flowfield {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ============================================================
   Navbar
   ============================================================ */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  height: 60px;
  transition: background 0.3s, backdrop-filter 0.3s, border-bottom 0.3s;
}

#navbar.scrolled {
  background: rgba(7, 11, 20, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-name {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.nav-cv {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border: 1px solid var(--cyan);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--cyan);
  letter-spacing: 0.06em;
  transition: background 0.2s, box-shadow 0.2s;
}
.nav-cv:hover {
  background: var(--cyan-dim);
  box-shadow: 0 0 16px var(--cyan-glow);
}

/* ============================================================
   Hero
   ============================================================ */
#hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 2rem 4rem;
}

.hero-content { max-width: 700px; }

.hero-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 2px solid var(--cyan);
  box-shadow: 0 0 24px var(--cyan-glow);
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.1s forwards;
  object-fit: cover;
}

.hero-label {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--cyan);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.2s forwards;
}

.hero-name {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 1.4rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.4s forwards;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto 2.5rem;
  opacity: 0;
  animation: fadeUp 0.8s 0.6s forwards;
}

.hero-links {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s 0.8s forwards;
}

.hero-link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 20px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color 0.2s, border-color 0.2s, box-shadow 0.2s, background 0.2s;
}
.hero-link:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--cyan-dim);
  box-shadow: 0 0 20px var(--cyan-glow);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  opacity: 0;
  animation: fadeIn 1s 1.4s forwards, bounce 2s 2.4s infinite;
  letter-spacing: 0.1em;
}

/* ============================================================
   Sections
   ============================================================ */
.section {
  position: relative;
  z-index: 1;
  padding: 7rem 2rem;
}

.section:nth-child(even) { background: rgba(13, 18, 32, 0.4); }

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

.section-title {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 3.5rem;
  letter-spacing: -0.01em;
}

.section-tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--cyan);
  opacity: 0.6;
}

/* ============================================================
   Blog / Projects cards
   ============================================================ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  position: relative;
  backdrop-filter: blur(10px);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}
.card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: 0 8px 40px rgba(0, 212, 255, 0.08);
  transform: translateY(-4px);
}

.card--coming-soon { overflow: hidden; }

.card-soon-badge {
  position: absolute;
  top: 1rem; right: 1rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  letter-spacing: 0.08em;
}

.card-tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--cyan);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
  display: block;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.6rem;
  line-height: 1.4;
}

.card-tag--seminar { color: #a78bfa; }
.card-tag--defense { color: #fbbf24; }

.card-link {
  display: inline-block;
  margin-top: 1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--cyan);
  letter-spacing: 0.04em;
  transition: opacity 0.2s;
}
.card-link:hover { opacity: 0.7; }

.card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================
   Project cards
   ============================================================ */
.proj-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.proj-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  backdrop-filter: blur(10px);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  position: relative;
}
.proj-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: 0 8px 40px rgba(0, 212, 255, 0.08);
  transform: translateY(-4px);
}

.proj-visual {
  width: 100%;
  height: 180px;
  background: var(--grad, linear-gradient(135deg, #0a1628, #0d2a4a));
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.proj-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
}
.proj-visual-label {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: rgba(0, 212, 255, 0.4);
  z-index: 1;
  letter-spacing: 0.1em;
}

.proj-body {
  padding: 1.4rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.proj-tags { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.proj-tag {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2px 7px;
  letter-spacing: 0.06em;
}

.proj-title {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.4;
}

.proj-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.proj-links { display: flex; gap: 0.75rem; margin-top: 0.3rem; }

.proj-link {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 5px 14px;
  border-radius: 5px;
  letter-spacing: 0.04em;
  background: var(--cyan-dim);
  color: var(--cyan);
  border: 1px solid rgba(0, 212, 255, 0.3);
  transition: background 0.2s, box-shadow 0.2s;
}
.proj-link:hover {
  background: rgba(0, 212, 255, 0.2);
  box-shadow: 0 0 16px var(--cyan-glow);
}

/* ============================================================
   Publications
   ============================================================ */
.pub-list { display: flex; flex-direction: column; gap: 2rem; }

.pub-card {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 0;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  backdrop-filter: blur(10px);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}
.pub-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: 0 12px 50px rgba(0, 212, 255, 0.08);
  transform: translateY(-3px);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.pub-img {
  background: var(--grad, linear-gradient(135deg, #0a1628, #0d2a4a));
  position: relative;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.pub-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
  transition: transform 0.4s;
}
.pub-card:hover .pub-img img { transform: scale(1.04); }

.pub-img-label {
  font-family: var(--mono);
  font-size: 1.4rem;
  font-weight: 500;
  color: rgba(0, 212, 255, 0.3);
  z-index: 1;
  letter-spacing: 0.06em;
  pointer-events: none;
}

.pub-body {
  padding: 1.8rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.5rem;
}

.pub-meta { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }

.pub-venue {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 500;
}
.pub-venue--neurips  { background: rgba(139, 92, 246, 0.15); color: #a78bfa; border: 1px solid rgba(139,92,246,0.25); }
.pub-venue--preprint { background: rgba(0, 212, 255, 0.1);   color: var(--cyan); border: 1px solid rgba(0,212,255,0.2); }
.pub-venue--award    { background: rgba(251, 191, 36, 0.1);  color: #fbbf24; border: 1px solid rgba(251,191,36,0.25); }
.pub-venue--acm      { background: rgba(34, 197, 94, 0.1);   color: #4ade80; border: 1px solid rgba(34,197,94,0.2); }

.pub-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.4;
}

.pub-authors {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

.pub-abstract {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.pub-links { display: flex; gap: 0.75rem; margin-top: 0.4rem; }

.pub-link {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 5px 14px;
  border-radius: 5px;
  letter-spacing: 0.04em;
  transition: background 0.2s, box-shadow 0.2s;
}
.pub-link--primary {
  background: var(--cyan-dim);
  color: var(--cyan);
  border: 1px solid rgba(0,212,255,0.3);
}
.pub-link--primary:hover {
  background: rgba(0, 212, 255, 0.2);
  box-shadow: 0 0 16px var(--cyan-glow);
}

/* ============================================================
   Footer
   ============================================================ */
#footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-muted);
}
#footer a { color: var(--cyan); transition: opacity 0.2s; }
#footer a:hover { opacity: 0.7; }

/* ============================================================
   Animations
   ============================================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(6px); }
}

/* ============================================================
   Toast
   ============================================================ */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(0, 212, 255, 0.12);
  color: var(--cyan);
  border: 1px solid rgba(0, 212, 255, 0.3);
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 8px 18px;
  border-radius: 6px;
  backdrop-filter: blur(12px);
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 200;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 700px) {
  .pub-card { grid-template-columns: 1fr; }
  .pub-img  { min-height: 160px; }
  #navbar   { padding: 0 1.2rem; }
  .section  { padding: 5rem 1.2rem; }
}