/* /papers/ surface — the scientific underpinning of the book.
   Academic-feeling layout: serif body, mono meta, conservative
   spacing. Shares fonts + palette with /book/ and /journeys/. */

@font-face {
  font-family: 'Newsreader';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/Newsreader-Regular.woff2') format('woff2');
}
@font-face {
  font-family: 'Newsreader';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/Newsreader-Italic.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/JetBrainsMono-Regular.woff2') format('woff2');
}

:root {
  --paper: #fafaf8;
  --paper-warm: #f4f1ea;
  --ink: #1a1a1a;
  --rule: #d8d3c8;
  --pencil: #b8b0a0;
  --accent: #6b5d4f;
  --quiet: #4a4a4a;
  --amber: #a87a3c;
}

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

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
}

body {
  font-family: 'Newsreader', Georgia, 'Times New Roman', serif;
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Shared header (same heights / padding as /book/, /journeys/, /tracks/). */
body > header {
  height: 60px;
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--paper);
}
.wordmark {
  font-weight: 400;
  font-size: 1.25rem;
  letter-spacing: 0.01em;
  margin: 0;
}
.wordmark a { color: inherit; text-decoration: none; }
.wordmark a:hover { color: var(--accent); }
.nav-links {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.8rem;
}
.nav-links a {
  color: var(--quiet);
  text-decoration: none;
  margin-left: 1rem;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active {
  color: var(--ink);
  font-weight: 600;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 3px;
}

.papers {
  max-width: 760px;
  margin: 0 auto;
  padding: 2.4rem 1.5rem 4rem;
}
.papers-header {
  margin-bottom: 2.2rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1.4rem;
}
.papers-title {
  font-size: 2.4rem;
  font-weight: 400;
  letter-spacing: 0.005em;
  margin: 0 0 0.4rem;
}
.papers-blurb {
  margin: 0;
  font-size: 1rem;
  color: var(--quiet);
  max-width: 56ch;
}

.paper-card {
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--rule);
}
.paper-card:last-child { border-bottom: none; }
.paper-meta {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--quiet);
  margin: 0 0 0.45rem;
}
.paper-meta-sep {
  margin: 0 0.55rem;
  color: var(--pencil);
}
.paper-title {
  font-size: 1.4rem;
  font-weight: 400;
  letter-spacing: 0.005em;
  margin: 0 0 0.4rem;
  line-height: 1.3;
}
.paper-venue {
  font-style: italic;
  color: var(--quiet);
  margin: 0 0 0.7rem;
  font-size: 0.95rem;
}
.paper-abstract {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--ink);
}
.paper-actions {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}
.paper-action {
  display: inline-block;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--paper);
  background: var(--ink);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--ink);
  border-radius: 1px;
  text-decoration: none;
  transition: opacity 0.12s;
}
.paper-action:hover { opacity: 0.85; }
.paper-action-secondary {
  background: transparent;
  color: var(--ink);
}
.paper-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--quiet);
  background: var(--paper-warm);
  border: 1px solid var(--rule);
  padding: 0.18rem 0.45rem;
  margin-right: 0.4rem;
  border-radius: 1px;
}

.papers-footnote {
  margin-top: 2.4rem;
  font-size: 0.92rem;
  color: var(--quiet);
  font-style: italic;
  max-width: 56ch;
}

@media (max-width: 600px) {
  body > header { height: 52px; padding: 0 0.75rem; }
  .papers { padding: 1.6rem 1rem 3rem; }
  .papers-title { font-size: 1.7rem; }
  .paper-title { font-size: 1.2rem; }
}

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