:root {
  --paper: #FAFAF8;
  --ink: #1C2230;
  --ink-soft: #5B6472;
  --line: #DDE1E7;
  --signal: #1E7F8C;
  --signal-soft: #E4F2F1;
  --spark: #C98A2C;

  --font-display: "Source Serif 4", Georgia, serif;
  --font-body: "Inter", -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--signal-soft); color: var(--ink); }

a {
  color: var(--ink);
  text-decoration-color: var(--line);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
a:hover { text-decoration-color: var(--signal); color: var(--signal); }
a:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- background field (signature element) ---------- */

.bg-field {
  position: fixed;
  top: 0;
  right: 0;
  width: min(52vw, 620px);
  height: auto;
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
}

.bg-field .orbit {
  fill: none;
  stroke: var(--signal);
  stroke-width: 1.1;
  opacity: 0.28;
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  animation: trace 2.6s ease-out forwards;
}
.bg-field .orbit-2 {
  opacity: 0.16;
  animation-delay: 0.25s;
}
.bg-field .fixed-point {
  fill: var(--spark);
  opacity: 0.6;
}

@keyframes trace {
  to { stroke-dashoffset: 0; }
}

/* ---------- layout ---------- */

.container {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
  padding: 5rem 1.5rem 4rem;
}

/* ---------- header ---------- */

.header { margin-bottom: 3rem; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 0.9rem;
}

.header h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  letter-spacing: -0.01em;
  margin: 0 0 0.6rem;
  color: var(--ink);
}

.affiliation {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 1.02rem;
  color: var(--ink-soft);
  margin: 0;
}
.affiliation a { font-style: normal; }

/* ---------- nav ---------- */

.nav {
  display: flex;
  gap: 1.75rem;
  padding: 0.9rem 0;
  margin-bottom: 3.5rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.nav a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  position: relative;
  padding-bottom: 2px;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 1px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav a:hover {
  color: var(--ink);
}
.nav a:hover::after { transform: scaleX(1); }

/* ---------- sections ---------- */

.section {
  padding: 2.75rem 0;
  border-bottom: 1px solid var(--line);
}
.section:last-of-type { border-bottom: none; }

.label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 1.4rem;
}

.lede {
  font-size: 1.08rem;
  max-width: 56ch;
  margin: 0;
  color: var(--ink);
}

/* advisor graph */

.advisors {
  margin-top: 1.6rem;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.6rem 0.9rem;
}

.advisors-caption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.advisor-graph {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0;
  padding: 0;
}

.advisor-graph li {
  display: flex;
  align-items: center;
  font-size: 0.98rem;
}

.advisor-graph li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  margin-right: 0.5rem;
  flex: none;
}

.advisor-graph li:not(:last-child) {
  margin-right: 1.1rem;
  padding-right: 1.1rem;
  border-right: 1px solid var(--line);
}

.advisor-graph a { text-decoration: none; }
.advisor-graph a:hover { text-decoration: underline; }

/* research */

.research-item { max-width: 60ch; }

.research-head {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.research-item h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
  margin: 0;
}

.research-item h3 a { text-decoration: none; }
.research-item h3 a:hover { text-decoration: underline; text-decoration-color: var(--signal); }

.status {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  background: var(--signal-soft);
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
}

.research-desc {
  color: var(--ink-soft);
  margin: 0.6rem 0 0;
  font-size: 0.98rem;
}

/* reading list */

.reading-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.reading-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
  transition: padding-left 0.2s ease, border-color 0.2s ease;
}
.reading-list li:first-child { border-top: none; }

.reading-list li:hover {
  padding-left: 0.6rem;
  border-color: var(--signal);
}

.book-title {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--ink);
}

.book-author {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

/* contact */

.contact-links {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-decoration: none;
  padding: 0.55rem 1rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.contact-link:hover {
  border-color: var(--signal);
  color: var(--signal);
  background: var(--signal-soft);
}

.contact-icon { color: var(--spark); }

/* footer */

.footer {
  margin-top: 3rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  text-align: center;
}

/* ---------- responsive ---------- */

@media (max-width: 600px) {
  .container { padding: 3.5rem 1.25rem 3rem; }
  .bg-field { width: 70vw; opacity: 0.4; }
  .nav { gap: 1.1rem; flex-wrap: wrap; }
  .advisor-graph li:not(:last-child) {
    border-right: none;
    margin-right: 0;
    padding-right: 0;
  }
  .advisor-graph li { margin-bottom: 0.4rem; margin-right: 1rem; }
  .reading-list li { flex-direction: column; gap: 0.15rem; }
}