/* ─── TOKENS ─────────────────────────────────────────────── */
:root {
  --bg:         #F5F0E8;
  --bg-alt:     #EDE8DF;
  --surface:    #E8E2D6;
  --surface2:   #DDD7CA;
  --border:     #C8C0B0;
  --text:       #1A1612;
  --text-muted: #5C5449;
  --accent:     #2D7A6B;
  --accent2:    #B85C00;
  --accent-dim: rgba(45,122,107,0.10);
  /* fonts, radius, etc. unchanged */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body:    'Inter', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;
  --nav-h: 64px;
  --radius: 10px;
  --transition: 0.25s ease;
}

/* ─── 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-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent2); }
img { max-width: 100%; }

/* ─── LAYOUT ─────────────────────────────────────────────── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }

/* ─── NAV ────────────────────────────────────────────────── */
#navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
 background: rgba(245,240,232,0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}
#navbar.scrolled { border-color: var(--border); }
.nav-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.nav-links { display: flex; gap: 2rem; }
.nav-links a {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--accent); }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--text-muted);
  transition: var(--transition);
}

/* ─── HERO ───────────────────────────────────────────────── */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--nav-h);
}
#graph-canvas {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  opacity: 0.35;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  padding-top: 4rem;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.1s forwards;
}
.hero-name {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.2s forwards;
}
.hero-name span { color: var(--accent); }
.hero-role {
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  font-weight: 400;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.3s forwards;
}
.hero-intro {
  max-width: 640px;
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.4s forwards;
}
.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.5s forwards;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.5rem;
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
}
.btn-primary:hover { background: #00dfc0; color: var(--bg); transform: translateY(-2px); }
.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.2rem;
  color: var(--text-muted);
  animation: bounce 2s ease infinite;
  z-index: 2;
}

/* ─── SECTIONS ───────────────────────────────────────────── */
.section { padding: 6rem 0; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--surface); }
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  position: absolute;
  left: 0; bottom: -8px;
  width: 36px; height: 3px;
  background: var(--accent);
  border-radius: 2px;
}
.section-title.light { color: var(--text); }
.section-sub {
  color: var(--text-muted);
  margin-top: -2rem;
  margin-bottom: 2.5rem;
  font-size: 0.95rem;
}

/* ─── ABOUT ──────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 4rem;
  align-items: start;
}

.about-avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 3px solid var(--accent);
  display: block;
  margin-bottom: 1.5rem;
  filter: grayscale(15%);
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  font-size: 1rem;
  line-height: 1.8;
}
.about-text p:first-child { color: var(--text); font-size: 1.05rem; }
.about-sidebar { display: flex; flex-direction: column; gap: 2rem; }
.skills-block, .contact-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.sidebar-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.skill-group { margin-bottom: 1.25rem; }
.skill-group:last-child { margin-bottom: 0; }
.skill-group-title {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(0,196,167,0.2);
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}
.contact-item a { color: var(--text-muted); }
.contact-item a:hover { color: var(--accent); }
.contact-icon { width: 16px; text-align: center; color: var(--accent); font-size: 0.9rem; }

/* ─── TIMELINE ───────────────────────────────────────────── */
.timeline { position: relative; padding-left: 1.5rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}
.timeline-item {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 2.5rem;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.52rem; top: 6px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-alt);
}
.timeline-degree {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.2rem;
}
.timeline-institution { color: var(--accent); font-size: 0.9rem; font-weight: 500; }
.timeline-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}
.timeline-highlight {
  display: inline-block;
  margin-top: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent2);
  background: rgba(245,166,35,0.1);
  border: 1px solid rgba(245,166,35,0.2);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
}

.timeline-thesis, .timeline-supervisors {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}
.timeline-thesis-label, .timeline-supervisors-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 500;
}

/* ─── EXPERIENCE ─────────────────────────────────────────── */
.exp-list { display: flex; flex-direction: column; gap: 2rem; }
.exp-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
  transition: border-color var(--transition), transform var(--transition);
}
.exp-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.exp-header { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }
.exp-role {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}
.exp-org { color: var(--accent); font-size: 0.9rem; font-weight: 500; }
.exp-period {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.exp-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.exp-bullets li {
  font-size: 0.92rem;
  color: var(--text-muted);
  padding-left: 1.2rem;
  position: relative;
}
.exp-bullets li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.8rem;
}

/* ─── PUBLICATIONS ───────────────────────────────────────── */
.pub-list { display: flex; flex-direction: column; gap: 1.5rem; }
.pub-card {
  border-left: 3px solid var(--accent);
  padding: 1.5rem 1.75rem;
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: background var(--transition);
}
.pub-card:hover { background: var(--surface2); }
.pub-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
  line-height: 1.4;
}
.pub-authors {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}
.pub-authors .me { color: var(--text); font-weight: 500; }
.pub-venue {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent2);
}

/* ─── PROJECTS ───────────────────────────────────────────── */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color var(--transition), transform var(--transition);
}
.project-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.project-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}
.project-subtitle {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.04em;
}
.project-desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.65; }
.project-highlights { display: flex; flex-direction: column; gap: 0.3rem; }
.project-highlights li {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding-left: 1rem;
  position: relative;
  list-style: none;
}
.project-highlights li::before { content: '·'; position: absolute; left: 0; color: var(--accent); }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: auto; }

/* ─── BLOG ───────────────────────────────────────────────── */
.blog-list { display: flex; flex-direction: column; gap: 1.25rem; }
.blog-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  cursor: pointer;
  transition: border-color var(--transition), transform var(--transition);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}
.blog-card:hover { border-color: var(--accent); transform: translateX(4px); }
.blog-card-left { flex: 1; }
.blog-card-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
  line-height: 1.35;
}
.blog-card-excerpt {
  font-size: 0.87rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0.6rem;
}
.blog-card-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}
.blog-card-arrow {
  color: var(--accent);
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 0.2rem;
}
.back-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 2.5rem;
  transition: all var(--transition);
}
.back-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ─── BLOG POST CONTENT ──────────────────────────────────── */
.blog-post-content {
  max-width: 720px;
}
.blog-post-content h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  line-height: 1.2;
}
.blog-post-content h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text);
  margin: 2.5rem 0 1rem;
}
.blog-post-content h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin: 2rem 0 0.75rem;
}
.blog-post-content p {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.85;
  font-size: 0.975rem;
}
.blog-post-content strong { color: var(--text); }
.blog-post-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--surface2);
  color: var(--accent);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}
.blog-post-content pre {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}
.blog-post-content pre code {
  background: none;
  padding: 0;
  color: var(--text);
  font-size: 0.87rem;
}
.blog-post-content ul, .blog-post-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-muted);
}
.blog-post-content li { margin-bottom: 0.4rem; line-height: 1.75; }
.blog-post-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--accent-dim);
  border-radius: 0 6px 6px 0;
}
.blog-post-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
/* KaTeX display */
.katex-display { margin: 1.5rem 0; overflow-x: auto; }

/* ─── ACTIVITIES ─────────────────────────────────────────── */
.act-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.25rem; }
.act-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}
.act-role {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}
.act-org { color: var(--accent); font-size: 0.8rem; font-weight: 500; }
.act-period { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-muted); margin: 0.25rem 0; }
.act-note { font-size: 0.85rem; color: var(--text-muted); }

/* ─── CONTACT ────────────────────────────────────────────── */
.contact-container { text-align: center; }
.contact-tagline { color: var(--text-muted); font-size: 1rem; margin-top: -2rem; margin-bottom: 2.5rem; }
.contact-links { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }
.contact-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 40px;
  padding: 0.6rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  transition: all var(--transition);
}
.contact-chip:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.contact-chip svg { width: 16px; height: 16px; flex-shrink: 0; }

/* ─── FOOTER ─────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ─── ANIMATIONS ─────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: none; }

/* ─── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--bg);
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    gap: 1.25rem;
    z-index: 99;
  }
  .nav-toggle { display: flex; }
  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .project-grid { grid-template-columns: 1fr; }
  .blog-card { flex-direction: column; }
  .hero-cta { flex-direction: column; align-items: flex-start; }
  .contact-links { flex-direction: column; align-items: center; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  #graph-canvas { display: none; }
}