*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

.wrap { max-width: 860px; margin: 0 auto; padding: 0 1.5rem; }

/* ── header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  height: 56px;
  display: flex;
  align-items: center;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 2rem;
  width: 100%;
  max-width: 860px;
}
.header-brand {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}
.header-nav {
  display: flex;
  gap: 1.5rem;
  flex: 1;
}
.header-nav a {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-muted);
  transition: color 0.15s;
}
.header-nav a:hover, .header-nav a.active { color: var(--text); }

/* ── section label ── */
.section-label {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── papers list ── */
.papers-section { padding: 3rem 0; }

.papers-grid {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.paper-card {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-elev);
  transition: background 0.15s;
  text-decoration: none;
  border-bottom: 1px solid var(--border);
}
.paper-card:last-child { border-bottom: none; }
.paper-card:hover { background: var(--bg-elev-2); }

.paper-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255, 95, 31, 0.1);
  border: 1px solid rgba(255, 95, 31, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  margin-top: 2px;
}

.paper-body { flex: 1; min-width: 0; }
.paper-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.35rem;
}
.paper-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}
.paper-tag {
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.paper-tag.chain {
  border-color: rgba(255,95,31,0.3);
  color: var(--accent);
  background: rgba(255,95,31,0.06);
}

.paper-arrow {
  flex-shrink: 0;
  color: var(--text-dim);
  font-size: 18px;
  align-self: center;
  transition: color 0.15s, transform 0.15s;
}
.paper-card:hover .paper-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

.papers-empty {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 13px;
  padding: 2rem 0;
}

/* ── single paper ── */
.paper-header { padding: 2.5rem 0 1rem; }
.paper-header-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}
.paper-header h1 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
  margin-bottom: 0;
}

.paper-content { padding: 2rem 0 4rem; }
.paper-content .wrap { max-width: 720px; }

/* ── markdown ── */
.md {
  color: var(--text);
  line-height: 1.75;
}
.md h1, .md h2, .md h3 {
  font-weight: 700;
  line-height: 1.3;
  margin: 2rem 0 0.75rem;
  color: var(--text);
}
.md h1 { font-size: 22px; }
.md h2 { font-size: 18px; }
.md h3 { font-size: 15px; }

.md p { margin: 0 0 1rem; }

.md a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.md a:hover { opacity: 0.8; }

.md code {
  font-family: var(--mono);
  font-size: 12.5px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  color: var(--live);
}

.md pre {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1rem 0 1.25rem;
}
.md pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13px;
  color: var(--text);
  border-radius: 0;
}

.md blockquote {
  border-left: 3px solid var(--accent);
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  background: rgba(255,95,31,0.04);
  border-radius: 0 6px 6px 0;
  color: var(--text-muted);
}
.md blockquote p { margin: 0; }

.md table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.25rem;
  font-size: 13.5px;
}
.md table th, .md table td {
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
.md table th {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--bg-elev);
  color: var(--text-muted);
  font-weight: 500;
}
.md table tr:nth-child(even) td { background: rgba(255,255,255,0.015); }

.md ul, .md ol {
  margin: 0 0 1rem 1.5rem;
}
.md li { margin-bottom: 0.25rem; }

.md hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* ── footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  margin-top: auto;
}
.site-footer .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.footer-brand {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
}
.footer-links {
  display: flex;
  gap: 1.25rem;
}
.footer-links a {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--text-muted); }

/* ── responsive ── */
@media (max-width: 600px) {
  .header-nav { display: none; }
  .paper-header h1 { font-size: 22px; }
  .footer-links { display: none; }
}