/* ---------------------------------------------------------------
   Sathvik Anantakrishnan — personal site
   Design: quiet, precise, "biologist who does physics & computation".
   Serif for reading text, monospace for labels/metadata/nav,
   restrained ink-on-paper palette, faint grid motif in the header.
   ------------------------------------------------------------- */

:root {
  --paper: #faf9f6;
  --ink: #1b1b1a;
  --ink-soft: #4a4a46;
  --rule: #d8d5cc;
  --accent: #8a3b12;      /* muted rust/amber, like old chart ink */
  --accent-soft: #b3703f;
  --mono: "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Georgia", serif;
  --max-width: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: -1px -1px;
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Content sits on a solid card so the grid reads as texture, not noise */
.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
  background: var(--paper);
}

.page-inner {
  background: var(--paper);
  border-left: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  padding: 0 32px;
}

header.site-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 0;
  background: var(--paper);
}

.site-header .identity {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 18px;
  margin-bottom: 0;
}

.site-header .name {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
  text-decoration: none;
}

.site-header .tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

nav.site-nav {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}

nav.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 4px 14px;
  border-right: 1px solid var(--rule);
  white-space: nowrap;
}

nav.site-nav a:last-child { border-right: none; }

nav.site-nav a:hover,
nav.site-nav a.active {
  color: var(--accent);
}

nav.site-nav a.active { text-decoration: underline; text-underline-offset: 4px; }

main {
  padding-top: 36px;
}

h1 {
  font-family: var(--serif);
  font-size: 1.9rem;
  font-weight: 600;
  margin: 0 0 6px;
  line-height: 1.25;
}

h2 {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 40px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--rule);
}

h2::before {
  content: "\00a7 ";
  color: var(--accent-soft);
  font-family: var(--mono);
}

h3 {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 22px 0 4px;
}

p { margin: 0 0 16px; }

.lede {
  font-size: 1.05rem;
  color: var(--ink-soft);
  margin-bottom: 28px;
}

a { color: var(--accent); }
a:hover { color: var(--accent-soft); }

.meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

/* Home hero */
.hero {
  display: flex;
  gap: 28px;
  align-items: flex-start;
  margin-bottom: 8px;
}

.hero img.headshot {
  width: 132px;
  height: 132px;
  object-fit: cover;
  border: 1px solid var(--rule);
  filter: grayscale(15%);
  flex-shrink: 0;
}

.hero .headshot-placeholder {
  width: 132px;
  height: 132px;
  border: 1px dashed var(--rule);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink-soft);
  text-align: center;
  padding: 8px;
}

.hero-text h1 { margin-bottom: 4px; }

.links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  margin: 20px 0 0;
}

.links-row a {
  padding: 3px 12px;
  border-right: 1px solid var(--rule);
  text-decoration: none;
}
.links-row a:last-child { border-right: none; }
.links-row a:hover { text-decoration: underline; }

/* Publications */
.pub-list { list-style: none; margin: 0; padding: 0; }

.pub {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}

.pub:first-child { border-top: 1px solid var(--rule); }

.pub .year {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.85rem;
  padding-top: 2px;
}

.pub .pub-title {
  font-weight: 600;
  margin: 0 0 4px;
}

.pub .pub-authors,
.pub .pub-venue {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  margin: 0 0 4px;
}

.pub .pub-me { color: var(--ink); font-weight: 700; }

.pub .pub-link {
  font-family: var(--mono);
  font-size: 0.78rem;
}

.pub-note {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  margin-top: 24px;
  border-left: 2px solid var(--rule);
  padding-left: 12px;
}

/* Research */
.research-block { margin-bottom: 8px; }

/* CV */
.cv-download {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.85rem;
  border: 1px solid var(--ink);
  padding: 10px 18px;
  text-decoration: none;
  color: var(--ink);
  margin: 8px 0 28px;
}
.cv-download:hover {
  background: var(--ink);
  color: var(--paper);
}

.cv-summary dl {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 6px 16px;
  font-size: 0.95rem;
}
.cv-summary dt {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  padding-top: 2px;
}
.cv-summary dd { margin: 0; }

/* Personal / books */
.book-list { list-style: none; margin: 0 0 8px; padding: 0; }

.book {
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
}
.book:first-child { border-top: 1px solid var(--rule); }

.book .book-title { font-weight: 600; }
.book .book-author {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
}
.book .book-desc {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* Contact */
.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.contact-list li {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
}
.contact-list li:first-child { border-top: 1px solid var(--rule); }
.contact-list .label {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  padding-top: 2px;
}

footer.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 24px 60px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--rule);
  background: var(--paper);
}

@media (max-width: 560px) {
  body { font-size: 16.5px; }
  .hero { flex-direction: column; }
  .pub { grid-template-columns: 1fr; gap: 4px; }
  .pub .year { padding-top: 0; }
  .cv-summary dl,
  .contact-list li { grid-template-columns: 1fr; }
}