/* Sathya Mellina — sathyamellina.com
   Palette and type tokens. Edit here to restyle the whole site. */

:root {
  --paper: #f7f8f9;
  --card: #ffffff;
  --ink: #12171d;
  --muted: #5f6873;
  --rule: #dee3e8;
  --accent: #15477e;
  --accent-hover: #0d3157;
  --mark: #d9e6f2;

  --display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --body: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --measure: 40rem;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Links ---------- */

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(21, 71, 126, 0.28);
  transition: color 120ms ease, border-color 120ms ease;
}

a:hover { color: var(--accent-hover); border-bottom-color: currentColor; }

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1rem;
  border: 0;
  z-index: 10;
}

.skip-link:focus { left: 0; }

/* ---------- Shell ---------- */

.shell {
  display: grid;
  grid-template-columns: 17rem minmax(0, 1fr);
  gap: 4rem;
  max-width: 66rem;
  margin: 0 auto;
  padding: 4.5rem 2rem 6rem;
}

/* ---------- Sidebar ---------- */

.rail { position: relative; }

.rail-inner { position: sticky; top: 4.5rem; }

.wordmark {
  display: block;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.375rem;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--ink);
  border: 0;
}

.wordmark:hover { color: var(--accent); }

.rail-role {
  margin: 0.6rem 0 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--muted);
}

.rail-nav { margin-top: 2rem; }

.rail-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.rail-nav li { margin-bottom: 0.45rem; }

.rail-nav a {
  font-family: var(--display);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink);
  border: 0;
}

.rail-nav a:hover { color: var(--accent); }

.rail-nav a[aria-current="page"] {
  color: var(--accent);
  border-bottom: 2px solid var(--mark);
}

.rail-links {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 2;
}

.rail-links a { display: block; border: 0; color: var(--muted); }

.rail-links a:hover { color: var(--accent); }

/* ---------- Content ---------- */

.content { max-width: var(--measure); }

.eyebrow {
  margin: 0 0 1.25rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0 0 1.5rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

h2 {
  margin: 3.5rem 0 1.25rem;
  font-family: var(--display);
  font-weight: 500;
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--rule);
}

.lead {
  font-size: 1.1875rem;
  line-height: 1.65;
}

p { margin: 0 0 1.15rem; }

mark {
  background: var(--mark);
  color: inherit;
  padding: 0.06em 0.22em;
  border-radius: 2px;
}

/* ---------- Entries (papers, courses, talks) ---------- */

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

.entry {
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--rule);
}

.entry:last-child { border-bottom: 0; }

.entry-title {
  margin: 0 0 0.3rem;
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.0625rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.entry-meta {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--muted);
}

.entry-note {
  margin: 0.55rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.55;
}

.venue {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.tag {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.1rem 0.4rem;
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--mark);
  border-radius: 2px;
  vertical-align: 0.15em;
}

.links {
  margin: 0.5rem 0 0;
  font-family: var(--mono);
  font-size: 0.75rem;
}

.links a { margin-right: 1rem; }

/* ---------- Expandable summaries ---------- */

details { margin-top: 0.5rem; }

details summary {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  cursor: pointer;
  list-style: none;
}

details summary::-webkit-details-marker { display: none; }

details summary::after { content: " +"; }

details[open] summary::after { content: " –"; }

details summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

details .entry-note { margin-top: 0.5rem; }

/* ---------- Timeline (background, teaching) ---------- */

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

.timeline li {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr);
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--rule);
}

.timeline li:last-child { border-bottom: 0; }

.timeline .when {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  padding-top: 0.25rem;
}

.timeline .what { font-size: 0.9375rem; line-height: 1.5; }

.timeline .what strong { font-family: var(--display); font-weight: 500; }

/* ---------- Callout ---------- */

.callout {
  margin-top: 2.5rem;
  padding: 1.25rem 1.4rem;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 4px;
  font-size: 0.9375rem;
}

.callout p:last-child { margin-bottom: 0; }

/* ---------- Footer ---------- */

.foot {
  margin-top: 4.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--muted);
}

/* ---------- Load-in ---------- */

.fade { animation: rise 520ms cubic-bezier(0.2, 0.7, 0.3, 1) both; }
.fade-2 { animation-delay: 90ms; }
.fade-3 { animation-delay: 180ms; }

@keyframes rise {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */

@media (max-width: 52rem) {
  .shell {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding: 2.5rem 1.35rem 4rem;
  }

  .rail-inner { position: static; }

  .rail-nav { margin-top: 1.5rem; }

  .rail-nav ul { display: flex; flex-wrap: wrap; gap: 0 1.25rem; }

  .rail-nav li { margin-bottom: 0; }

  .rail-links { line-height: 1.9; }

  .rail-links a { display: inline; margin-right: 1rem; }

  .timeline li { grid-template-columns: 1fr; gap: 0.15rem; }

  .timeline .when { padding-top: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .fade { animation: none; }
  * { transition: none !important; }
}