/* ---------- reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 {
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-2);
}
p { margin: 0 0 var(--space-3); }
a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-dark); text-decoration: underline; }
img { max-width: 100%; display: block; }
ul { padding-left: 1.2em; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}
.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}
.nav__logo {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-text);
}
.nav__logo:hover { text-decoration: none; color: var(--color-accent); }
.nav__links {
  display: flex;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__links a {
  color: var(--color-text);
  font-size: 0.95rem;
}
.nav__links a:hover { color: var(--color-accent); }
.nav__toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: var(--font-mono);
  padding: var(--space-1) var(--space-2);
  cursor: pointer;
}

/* ---------- sections ---------- */
.section { padding: var(--space-6) 0; }
.section--tight { padding: var(--space-5) 0; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}
.section-title { font-size: 1.6rem; margin-bottom: var(--space-4); }
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ---------- hero / code window ---------- */
.hero { padding: var(--space-6) 0 var(--space-5); }
.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-5);
  align-items: center;
}
.hero__avatar {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-3);
}
.hero__name { font-size: 2.4rem; margin-bottom: var(--space-2); }
.hero__role { font-size: 1.15rem; color: var(--color-text-muted); margin-bottom: var(--space-3); }
.hero__tagline { font-size: 1.05rem; max-width: 46ch; }
.hero__cta { display: flex; gap: var(--space-3); margin-top: var(--space-4); flex-wrap: wrap; }
.hero__social {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.hero__social a { color: var(--color-text-muted); }
.hero__social a:hover { color: var(--color-accent); }

.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: var(--space-2) var(--space-3);
  border-radius: 6px;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
.btn:hover { text-decoration: none; border-color: var(--color-accent); color: var(--color-accent); }
.btn--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}
.btn--accent:hover { background: var(--color-accent-dark); border-color: var(--color-accent-dark); color: #fff; }

.code-window {
  background: #1f2421;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(31, 36, 33, 0.15);
}
.code-window__titlebar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: var(--space-2) var(--space-3);
  background: #2a302b;
}
.code-window__titlebar .dot { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.dot--red { background: #e0605a; }
.dot--yellow { background: #e8b84b; }
.dot--green { background: #4bae6f; }
.code-window__filename {
  margin-left: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #9aa39c;
}
.code-window__body {
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #d7e0d9;
  overflow-x: auto;
}
.code-window__body .line { white-space: pre; min-height: 1.35em; }
.code-window__body .kw { color: #7fc9a0; }
.code-window__body .str { color: #e8b84b; }
.caret {
  display: inline-block;
  width: 7px;
  height: 1em;
  margin-left: 1px;
  background: #7fc9a0;
  vertical-align: text-bottom;
  animation: caret-blink 1s steps(1) infinite;
}
@keyframes caret-blink {
  0%, 50% { opacity: 1; }
  50.01%, 100% { opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .caret { animation: none; }
}

/* ---------- grid & cards ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-3);
}
.focus-areas__grid {
  grid-template-columns: repeat(2, 1fr);
}
.focus-areas__grid .card p {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--color-text-muted);
}
.card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-4);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--color-accent); transform: translateY(-2px); }
.card h3 { font-size: 1.1rem; }
.card p:last-child { margin-bottom: 0; }

/* ---------- tags / pills ---------- */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 8px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-muted);
  margin: 0 var(--space-1) var(--space-1) 0;
}
.tag--accent { border-color: var(--color-accent); color: var(--color-accent); }
.tag--award { border-color: #b9862e; color: #8a641f; }

/* ---------- lists (education / activities) ---------- */
.list-plain { list-style: none; padding: 0; margin: 0; }
.list-plain li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
}
.list-plain li:last-child { border-bottom: none; }
.edu-degree { font-weight: 600; }
.edu-institution { color: var(--color-text-muted); }
.honors-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
}
.honors-item__title { flex: 1; }

/* ---------- skills diagram ---------- */
.skills__diagram {
  position: relative;
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: var(--space-6);
  padding: var(--space-6) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  background-color: var(--color-bg);
  background-image: radial-gradient(var(--color-border) 1px, transparent 1px);
  background-size: 20px 20px;
  overflow: hidden;
}
.skills__lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: visible;
}
.skills__line {
  fill: none;
  stroke: var(--color-text-muted);
  stroke-width: 1.5;
  stroke-opacity: 0.55;
  stroke-dasharray: 5 5;
  animation: skills-dash-flow 1.4s linear infinite;
}
.skills__dot { fill: var(--color-text-muted); }
.skills__arrow { fill: var(--color-text-muted); }
@keyframes skills-dash-flow {
  to { stroke-dashoffset: -20; }
}
.skills__hub {
  position: relative;
  z-index: 1;
  align-self: center;
  flex: 0 0 auto;
  width: 92px;
  height: 92px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  box-shadow: 0 10px 24px rgba(46, 125, 79, 0.28);
}
.skills__side {
  position: relative;
  z-index: 1;
  flex: 1 1 320px;
  min-width: 0;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-3);
}
.skills__side--left { align-items: stretch; }
.skills__side--right { align-items: stretch; }
.skills__node {
  background: var(--color-bg-alt);
  box-shadow: 0 2px 10px rgba(31, 36, 33, 0.06);
  min-height: 100px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.skills__node-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}
.skills__node-icon {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}
.skills__node-icon svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.skills__node h3 { font-size: 0.95rem; margin: 0; }
.skills__node-tags {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin: 0;
}
.skills__node-tags .sep {
  color: var(--color-accent);
  font-weight: 700;
  padding: 0 2px;
}

@media (max-width: 880px) {
  .skills__diagram { flex-direction: column; align-items: center; padding: var(--space-5) var(--space-4); }
  .skills__hub { margin-bottom: var(--space-2); order: -1; }
  .skills__side { max-width: 100%; width: 100%; }
  .skills__lines { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .skills__line { animation: none; }
}

/* ---------- publications ---------- */
.filter-pills {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}
.filter-pill {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: none;
  cursor: pointer;
  color: var(--color-text);
}
.filter-pill.is-active,
.filter-pill:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.year-group {
  margin-bottom: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.year-group__heading {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-2);
}
.pub-card__title { font-size: 1.05rem; margin-bottom: var(--space-1); }
.pub-card__authors { color: var(--color-text-muted); margin-bottom: var(--space-2); }
.pub-card__meta { margin-bottom: var(--space-2); }
.pub-card__links a { font-family: var(--font-mono); font-size: 0.85rem; margin-right: var(--space-3); }

/* ---------- blog ---------- */
.post-card__summary { color: var(--color-text-muted); }
.post-meta { font-family: var(--font-mono); font-size: 0.85rem; color: var(--color-text-muted); margin-bottom: var(--space-3); }
.prose { max-width: 70ch; }
.prose pre {
  background: #1f2421;
  color: #d7e0d9;
  padding: var(--space-3);
  border-radius: var(--radius-card);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}
.prose code {
  font-family: var(--font-mono);
  background: var(--color-bg-alt);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.9em;
}
.prose pre code { background: none; padding: 0; }
.back-link { display: inline-block; margin-bottom: var(--space-4); font-family: var(--font-mono); font-size: 0.9rem; }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-5) 0;
  text-align: center;
  color: var(--color-text-muted);
}
.footer__social {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  flex-wrap: wrap;
}
.footer__social a {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--space-1) var(--space-3);
}
.footer__social a:hover { text-decoration: none; border-color: var(--color-accent); color: var(--color-accent); }
.footer__note { font-family: var(--font-mono); font-size: 0.8rem; }

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    gap: 0;
    padding: var(--space-2) var(--space-4);
  }
  .nav__links.is-open { display: flex; }
  .nav__links li { padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border); }
  .nav__links li:last-child { border-bottom: none; }
  .nav__toggle { display: inline-block; }
  .nav { position: relative; }

  .hero__grid { grid-template-columns: 1fr; }
  .grid { grid-template-columns: 1fr; }
  .hero__name { font-size: 1.9rem; }
}