/* ---------------------------------------------------------------
   Tokens
--------------------------------------------------------------- */
:root {
  --paper: #F6F5F1;
  --paper-alt: #EDEBE3;
  --ink: #16181B;
  --ink-soft: #4A4E54;
  --ink-faint: #7B7E82;
  --rule: #D6D3C8;
  --rule-strong: #B9B5A6;
  --accent: #1D3B63;
  --accent-soft: #E7EDF4;

  --status-implemented: #2F6F4E;
  --status-designed: #B5791C;
  --status-proposed: #8A8578;
  --status-future: #A79EE0;

  --font-serif: 'STIX Two Text', 'Iowan Old Style', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, monospace;

  --max-w: 940px;
}

/* ---------------------------------------------------------------
   Reset & base
--------------------------------------------------------------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
a:hover { border-bottom-color: currentColor; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
ul { margin: 0; padding: 0; list-style: none; }
p { margin: 0 0 1em; }
h1, h2 { margin: 0; font-weight: 600; }
.mono-small { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; color: var(--ink-soft); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ---------------------------------------------------------------
   Masthead / nav
--------------------------------------------------------------- */
.masthead {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 28px 24px 0;
}
.masthead-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 16px;
}
.masthead-name {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--ink);
  border: none;
}
.masthead-journal {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.nav-bar {
  margin-top: 14px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 10px 0;
  position: relative;
}
.nav-list {
  display: flex;
  gap: 28px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.nav-list a { color: var(--ink-soft); border: none; padding-bottom: 2px; }
.nav-list a.is-active, .nav-list a:hover { color: var(--accent); border-bottom: 1px solid var(--accent); }
.nav-toggle {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: none;
  border: 1px solid var(--rule-strong);
  color: var(--ink);
  padding: 6px 12px;
  cursor: pointer;
}

/* ---------------------------------------------------------------
   Paper / article shell
--------------------------------------------------------------- */
main { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.paper { padding: 48px 0 80px; }

.byline { margin-bottom: 28px; }
.doc-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
}
.doc-subtitle {
  margin-top: 10px;
  font-size: 1.1rem;
  color: var(--ink-soft);
  font-style: italic;
  max-width: 62ch;
}
.doc-meta { margin-top: 12px; text-transform: uppercase; }

.abstract-block {
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  padding: 20px 0;
  margin: 28px 0 36px;
  font-size: 0.98rem;
}
.abstract-label {
  font-weight: 700;
  font-style: italic;
}
.index-terms { margin-top: 10px; color: var(--ink-soft); font-size: 0.94rem; }

.paper-section { margin: 40px 0; }
.section-heading {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 0.92rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  border-top: 1px solid var(--rule);
  padding-top: 10px;
  margin-bottom: 16px;
}
.section-num {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
}
.section-note { color: var(--ink-soft); font-size: 0.92rem; margin-bottom: 16px; max-width: 68ch; }

.article-grid { column-gap: 44px; }
@media (min-width: 820px) {
  .article-grid { column-count: 2; column-rule: 1px solid var(--rule); }
  .article-grid p { break-inside: avoid; }
}
.article-grid p { max-width: 62ch; }

/* ---------------------------------------------------------------
   Spec grid (hardware / software / skills)
--------------------------------------------------------------- */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px 32px;
  margin-top: 18px;
}
.spec-label { color: var(--ink-faint); margin-bottom: 8px; }
.spec-list li {
  padding: 5px 0;
  border-bottom: 1px dotted var(--rule);
  font-size: 0.95rem;
}
.spec-list li:last-child { border-bottom: none; }

/* ---------------------------------------------------------------
   Status ledger
--------------------------------------------------------------- */
.status-ledger { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.status-ledger th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--ink);
  padding: 8px 10px;
}
.status-ledger td {
  padding: 9px 10px;
  border-bottom: 1px solid var(--rule);
  vertical-align: middle;
}
.status-ledger tr:hover td { background: var(--paper-alt); }
.status-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}
.status-dot.is-implemented { background: var(--status-implemented); }
.status-dot.is-designed { background: var(--status-designed); }
.status-dot.is-proposed { background: var(--status-proposed); }
.status-dot.is-future-work { background: transparent; border: 1px solid var(--status-future); }
.status-word { text-transform: capitalize; color: var(--ink-soft); }
.status-legend {
  display: flex; flex-wrap: wrap; gap: 18px;
  margin-top: 14px; color: var(--ink-faint);
}
.status-legend li { display: flex; align-items: center; }

/* ---------------------------------------------------------------
   Work list (home + index)
--------------------------------------------------------------- */
.work-list { margin-top: 18px; }
.work-row {
  padding: 16px 0;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 4px 12px;
  align-items: baseline;
}
.work-list-full .work-row:last-child { border-bottom: 1px solid var(--rule); }
.work-row-title {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--ink);
  grid-column: 1;
}
.work-row-title:hover { color: var(--accent); }
.tier-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  padding: 2px 7px;
  border: 1px solid var(--rule-strong);
  color: var(--ink-soft);
  align-self: center;
}
.tier-s { border-color: var(--accent); color: var(--accent); }
.work-row-status {
  grid-column: 3;
  justify-self: end;
  text-transform: uppercase;
  align-self: center;
}
.work-row-sub {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.work-row-tags { grid-column: 1 / -1; margin-top: 6px; color: var(--ink-faint); }
.see-all { margin-top: 18px; }

.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0; }
.filter-chip {
  font-family: var(--font-mono);
  background: none;
  border: 1px solid var(--rule-strong);
  color: var(--ink-soft);
  padding: 5px 11px;
  text-transform: lowercase;
  letter-spacing: 0.02em;
  cursor: pointer;
}
.filter-chip.is-active, .filter-chip:hover { border-color: var(--accent); color: var(--accent); }

/* ---------------------------------------------------------------
   CV
--------------------------------------------------------------- */
.cv-list li {
  padding: 7px 0;
  border-bottom: 1px dotted var(--rule);
  font-size: 0.97rem;
}
.cv-list li:last-child { border-bottom: none; }
.print-btn {
  margin-top: 14px;
  font-family: var(--font-mono);
  background: none;
  border: 1px solid var(--rule-strong);
  padding: 7px 14px;
  cursor: pointer;
  color: var(--ink);
}
.print-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ---------------------------------------------------------------
   Footer
--------------------------------------------------------------- */
.breadcrumb { margin-bottom: 20px; }
.site-footer { max-width: var(--max-w); margin: 60px auto 0; padding: 0 24px 48px; }
.footer-rule { border-top: 1px solid var(--ink); margin-bottom: 24px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.footer-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 10px;
}
.footer-refs li { font-size: 0.9rem; padding: 3px 0; }
.footer-meta p { margin: 3px 0; }

/* ---------------------------------------------------------------
   Responsive
--------------------------------------------------------------- */
@media (max-width: 700px) {
  .nav-toggle { display: inline-block; }
  .nav-list {
    display: none;
    flex-direction: column;
    gap: 12px;
    padding-top: 12px;
  }
  .nav-list.is-open { display: flex; }
  .work-row { grid-template-columns: 1fr; }
  .work-row-status { justify-self: start; grid-column: 1; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------------------------------------------------------------
   Print (CV)
--------------------------------------------------------------- */
@media print {
  .masthead, .site-footer, .print-btn, .filter-bar { display: none; }
  body { background: #fff; }
  main { max-width: 100%; }
}