/* ─── Variables ─────────────────────────────────────────────────── */
:root {
  --bg:      #0a0a0a;
  --surface: #111111;
  --green:   #00ff88;
  --cyan:    #00b4d8;
  --text:    #d4d4d4;
  --muted:   #555555;
  --border:  #1c1c1c;
  --font:    'JetBrains Mono', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.75;
  overflow-x: hidden;
}

/* ─── Canvas background ─────────────────────────────────────────── */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ─── Z-layer above canvas ──────────────────────────────────────── */
nav, section, footer { position: relative; z-index: 1; }

/* ─── Shared utils ──────────────────────────────────────────────── */
.accent-green { color: var(--green); }
.accent-cyan  { color: var(--cyan);  }
.hl           { color: var(--green); }

.blink { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

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

/* ─── Navigation ────────────────────────────────────────────────── */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 3rem;
  background: rgba(10, 10, 10, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: border-color 0.3s;
}

.nav-logo {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--green);
  letter-spacing: -0.02em;
}

#nav ul { display: flex; gap: 2.5rem; list-style: none; }

#nav ul a {
  font-size: 0.8rem;
  color: var(--muted);
  transition: color 0.2s;
}
#nav ul a:hover,
#nav ul a.active { color: var(--green); }

/* ─── Hero ──────────────────────────────────────────────────────── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 3rem;
}

.hero-content {
  max-width: 900px;
  display: flex;
  align-items: center;
  gap: 4rem;
}

.hero-text { flex: 1; max-width: 620px; }

.hero-photo {
  flex-shrink: 0;
}

.hero-photo img {
  width: 210px;
  height: 210px;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
  border: 1px solid var(--border);
  filter: grayscale(20%);
  display: block;
}

.hero-label {
  font-size: 0.8rem;
  margin-bottom: 1.2rem;
  line-height: 1.8;
}

.term-path   { color: var(--cyan); }
.term-branch { color: var(--green); opacity: 0.75; }
.term-dollar { color: var(--muted); }
.term-cmd    { color: #ffffff; }

h1 {
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 1.1rem;
  white-space: nowrap;
}

/* ─── Glitch effect on h1 ───────────────────────────────────────── */
.glitch {
  position: relative;
  display: inline-block;
}
.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  font-size: inherit;
  font-weight: inherit;
  letter-spacing: inherit;
  pointer-events: none;
  opacity: 0;
}
.glitch:hover::before {
  opacity: 0.7;
  color: var(--cyan);
  clip-path: polygon(0 20%, 100% 20%, 100% 40%, 0 40%);
  animation: glitch-1 0.4s steps(2) forwards;
}
.glitch:hover::after {
  opacity: 0.7;
  color: var(--green);
  clip-path: polygon(0 60%, 100% 60%, 100% 80%, 0 80%);
  animation: glitch-2 0.4s steps(2) 0.05s forwards;
}
@keyframes glitch-1 {
  0%   { transform: translate(-3px, 0);  }
  50%  { transform: translate(3px, 0);   }
  100% { transform: translate(0, 0); opacity: 0; }
}
@keyframes glitch-2 {
  0%   { transform: translate(3px, 0);  }
  50%  { transform: translate(-3px, 0); }
  100% { transform: translate(0, 0); opacity: 0; }
}

/* ─── Typed subtitle ────────────────────────────────────────────── */
.hero-sub {
  font-size: 0.95rem;
  color: var(--cyan);
  margin-bottom: 2.5rem;
  min-height: 1.5em;
}

/* ─── Buttons ───────────────────────────────────────────────────── */
.hero-links, .contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  padding: 0.45rem 1.1rem;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--font);
  font-size: 0.78rem;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.btn:hover {
  border-color: var(--green);
  color: var(--green);
}
.btn-accent {
  border-color: var(--cyan);
  color: var(--cyan);
}
.btn-accent:hover {
  background: var(--cyan);
  color: var(--bg);
}

/* ─── Sections ──────────────────────────────────────────────────── */
section { padding: 7rem 3rem; }

.container {
  max-width: 760px;
  margin: 0 auto;
}

.section-title {
  font-size: 0.78rem;
  color: var(--green);
  font-weight: 400;
  letter-spacing: 0.06em;
  margin-bottom: 3rem;
}

/* ─── About ─────────────────────────────────────────────────────── */
.about-body p { margin-bottom: 1rem; }
.about-body a {
  color: var(--cyan);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.about-body a:hover { border-color: var(--cyan); }

/* ─── Timeline ──────────────────────────────────────────────────── */
.timeline-group { margin-bottom: 2.5rem; }

.group-label {
  font-size: 0.7rem;
  color: var(--muted);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 1.2rem;
}

.tl-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1.2rem;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
}
.tl-item:last-child { border-bottom: 1px solid var(--border); }

.tl-date {
  font-size: 0.72rem;
  color: var(--muted);
  padding-top: 0.15rem;
  white-space: nowrap;
}

.tl-title {
  font-size: 0.87rem;
  font-weight: 500;
  color: #fff;
  margin-bottom: 0.15rem;
}

.tl-sub {
  font-size: 0.78rem;
  color: var(--muted);
}
.tl-sub a { color: var(--cyan); }
.tl-sub a:hover { text-decoration: underline; }

.tl-bullets {
  list-style: none;
  margin-top: 0.45rem;
}
.tl-bullets li {
  font-size: 0.78rem;
  color: var(--muted);
  padding-left: 1.1em;
  position: relative;
  margin-bottom: 0.2rem;
}
.tl-bullets li::before {
  content: '+';
  position: absolute;
  left: 0;
  color: var(--green);
  opacity: 0.55;
}

/* ─── Publications ──────────────────────────────────────────────── */
.pub-item {
  padding: 1.2rem 0;
  border-top: 1px solid var(--border);
}
.pub-item:last-child { border-bottom: 1px solid var(--border); }

.pub-venue {
  font-size: 0.7rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.pub-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: #fff;
  margin-bottom: 0.2rem;
}
.pub-title a { color: inherit; transition: color 0.2s; }
.pub-title a:hover { color: var(--cyan); }

.pub-authors {
  font-size: 0.78rem;
  color: var(--muted);
}

/* ─── Contact ───────────────────────────────────────────────────── */
.contact-intro {
  margin-bottom: 2rem;
  max-width: 520px;
  line-height: 1.8;
}

/* ─── Footer ────────────────────────────────────────────────────── */
footer {
  padding: 1.8rem 3rem;
  text-align: center;
  font-size: 0.72rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}
footer a { color: var(--muted); }
footer a:hover { color: var(--green); }

/* ─── Scroll fade-in ────────────────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Responsive ────────────────────────────────────────────────── */
@media (max-width: 640px) {
  #nav    { padding: 1rem 1.5rem; }
  #hero,
  section { padding: 6rem 1.5rem; }
  footer  { padding: 1.5rem; }

  h1 { font-size: 2.4rem; white-space: normal; }

  .hero-content { flex-direction: column-reverse; gap: 2rem; align-items: flex-start; }
  .hero-photo img { width: 120px; height: 120px; }

  .tl-item { grid-template-columns: 1fr; gap: 0.3rem; }
  .tl-date { font-size: 0.7rem; }
}