/* =========================================================
   "Nobody Did This" — CSCW Workshop on Agent-Mediated Collaboration
   Design: technical preprint / modernist
   Fonts: Inter Tight (display) + Inter (body) + IBM Plex Mono (labels)
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter+Tight:wght@500;600;700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --paper:        oklch(98.5% 0.004 240);
  --paper-tint:   oklch(96%   0.006 240);
  --paper-edge:   oklch(91%   0.008 240);
  --ink:          oklch(18%   0.02  250);
  --ink-mid:      oklch(42%   0.015 250);
  --ink-light:    oklch(62%   0.012 250);
  --accent:       oklch(48%   0.10  205);  /* deep teal */
  --accent-deep:  oklch(36%   0.10  205);
  --accent-pale:  oklch(94%   0.025 205);
  --rule:         oklch(88%   0.005 240);
  --rule-soft:    oklch(92%   0.004 240);
  --dot:          oklch(86%   0.005 240);

  --font-display: 'Inter Tight', system-ui, sans-serif;
  --font-ui:      'Inter', system-ui, sans-serif;
  --font-mono:    'IBM Plex Mono', 'SF Mono', Consolas, monospace;

  --size-xs:   0.75rem;
  --size-sm:   0.875rem;
  --size-base: 1rem;
  --size-md:   1.0625rem;
  --size-lg:   1.25rem;
  --size-xl:   clamp(1.375rem, 1.75vw, 1.625rem);
  --size-2xl:  clamp(1.75rem,  2.5vw,  2.375rem);
  --size-3xl:  clamp(2.25rem,  4.5vw,  3.75rem);

  --max-w: 1180px;
  --col-prose: 68ch;
  --gap: clamp(1.25rem, 4vw, 2.5rem);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background-color: var(--paper);
  /* Fine dot pattern, low contrast */
  background-image: radial-gradient(circle at 1px 1px, var(--dot) 1px, transparent 0);
  background-size: 22px 22px;
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: var(--size-base);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a {
  color: var(--accent-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover { color: var(--accent); }

/* ── Doc number tag ── */
.doc-num {
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.02em;
}

/* ── Nav ── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 251, 249, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--rule);
  padding: 0 var(--gap);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  height: 3.5rem;
  position: relative;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: var(--size-md);
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.02em;
  white-space: nowrap;
  line-height: 1.1;
}
.nav-logo .doc-num {
  display: block;
  font-size: 0.65rem;
  margin-bottom: 0.15rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.nav-links {
  display: flex;
  gap: 0;
  list-style: none;
  align-items: center;
}
.nav-links a {
  font-family: var(--font-ui);
  font-size: var(--size-sm);
  font-weight: 500;
  color: var(--ink-mid);
  text-decoration: none;
  padding: 0.4rem 0.85rem;
  transition: color 0.15s;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}
.nav-links a.nav-cta {
  background: var(--ink);
  color: var(--paper);
  font-weight: 500;
  margin-left: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 2px;
}
.nav-links a.nav-cta:hover {
  background: var(--accent-deep);
  color: var(--paper);
}
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule);
  border-radius: 2px;
  cursor: pointer;
  padding: 0.4rem 0.55rem;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1;
}

/* ── Hero ── */
.hero {
  padding: clamp(3rem, 7vw, 6rem) var(--gap) clamp(2rem, 5vw, 4rem);
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.hero-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.5rem;
  margin-bottom: 2.5rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  letter-spacing: 0.04em;
  color: var(--ink-mid);
  text-transform: uppercase;
}
.hero-meta-row .accent { color: var(--accent); }
.hero-pretitle {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: var(--size-sm);
  font-weight: 400;
  color: var(--accent-deep);
  margin-bottom: 1rem;
  letter-spacing: 0.01em;
  text-transform: none;
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--size-3xl);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.035em;
  margin-bottom: 1.75rem;
  max-width: 18ch;
  color: var(--ink);
}
.hero-title .quoted {
  font-style: normal;
  font-weight: 700;
  color: var(--accent-deep);
}
.hero-lede {
  font-family: var(--font-ui);
  font-size: clamp(1.05rem, 1.3vw, 1.2rem);
  font-weight: 400;
  line-height: 1.55;
  color: var(--ink-mid);
  max-width: 62ch;
  margin-bottom: 2.25rem;
  padding-left: 0;
  border-left: none;
}
.hero-lede strong { color: var(--ink); font-weight: 600; }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-ui);
  font-size: var(--size-sm);
  font-weight: 500;
  letter-spacing: 0;
  padding: 0.7rem 1.25rem;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  border: 1px solid transparent;
  border-radius: 2px;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-primary:hover {
  background: var(--accent-deep);
  color: var(--paper);
  border-color: var(--accent-deep);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}
.btn-ghost:hover {
  background: var(--ink);
  color: var(--paper);
}

/* ── Section ── */
.section {
  padding: clamp(2.5rem, 5.5vw, 4.5rem) var(--gap);
  border-bottom: 1px solid var(--rule);
  background: transparent;
}
.section:last-of-type { border-bottom: none; }
.section.alt {
  background: var(--paper-tint);
}
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.section-header {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1.5rem 3rem;
  margin-bottom: 2.5rem;
  align-items: baseline;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}
.section-label {
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--accent);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--size-2xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--ink);
}

/* ── Themes ── */
.themes-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.theme-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 2rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--rule);
}
.theme-row:first-child { border-top: 1px solid var(--rule); }
.theme-row .doc-num {
  font-family: var(--font-mono);
  font-size: var(--size-sm);
  font-weight: 500;
  color: var(--accent);
  font-style: normal;
  padding-top: 0.15rem;
}
.theme-title {
  font-family: var(--font-display);
  font-size: var(--size-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  color: var(--ink);
}
.theme-body {
  font-size: var(--size-base);
  color: var(--ink-mid);
  line-height: 1.6;
  max-width: 65ch;
}

/* ── Dates table ── */
.dates-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-ui);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.dates-table th,
.dates-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--rule);
  font-size: var(--size-sm);
  vertical-align: top;
}
.dates-table th {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--size-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-mid);
  border-bottom: 1px solid var(--ink);
}
.dates-table td:first-child {
  font-weight: 500;
  white-space: nowrap;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  padding-top: 1rem;
}
.dates-table td:last-child { color: var(--ink-mid); }
.date-tbd { color: var(--ink-light); font-style: italic; }
.date-highlight td { background: var(--accent-pale); }
.date-highlight td:first-child { color: var(--accent-deep); font-weight: 600; }

/* ── Prose ── */
.prose {
  max-width: var(--col-prose);
  font-size: var(--size-md);
  line-height: 1.65;
  color: var(--ink-mid);
}
.prose h2 {
  font-family: var(--font-display);
  font-size: var(--size-xl);
  font-weight: 600;
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.prose h3 {
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.prose p { margin-bottom: 1.15rem; }
.prose ul, .prose ol { margin: 1rem 0 1.5rem 1.25rem; }
.prose li { margin-bottom: 0.5rem; }
.prose strong { font-weight: 600; color: var(--ink); }
.prose em { font-style: italic; }
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.4rem 0 0.4rem 1.25rem;
  margin: 1.5rem 0;
  font-family: var(--font-ui);
  font-style: normal;
  font-size: var(--size-base);
  color: var(--ink);
  line-height: 1.5;
}
code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--paper-tint);
  padding: 0.1em 0.35em;
  border: 1px solid var(--rule);
  border-radius: 2px;
  color: var(--accent-deep);
}
pre {
  font-family: var(--font-mono);
  background: var(--ink);
  color: var(--paper);
  padding: 1.1rem 1.4rem;
  overflow-x: auto;
  line-height: 1.55;
  font-size: 0.825rem;
  margin: 1.5rem 0;
  border-left: 3px solid var(--accent);
  border-radius: 2px;
}
pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

/* ── Organizers ── */
.organizers-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--ink);
}
.organizer-row {
  display: grid;
  grid-template-columns: 64px minmax(180px, 220px) 1fr;
  gap: 1.25rem 1.75rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
}
.organizer-photo {
  width: 64px;
  height: 64px;
  border-radius: 2px;
  overflow: hidden;
  background: var(--paper-tint);
  border: 1px solid var(--rule);
  flex-shrink: 0;
}
.organizer-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(30%) contrast(1.02);
}
.organizer-photo.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink-light);
  border: 1px dashed var(--rule);
  background: var(--paper);
  letter-spacing: -0.02em;
}
.organizer-name-block {
  font-family: var(--font-ui);
}
.organizer-name {
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 0.3rem;
  color: var(--ink);
}
.organizer-role {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
}
.organizer-affil {
  font-family: var(--font-ui);
  font-size: var(--size-sm);
  color: var(--ink-mid);
  margin-bottom: 0.5rem;
  margin-top: 0.4rem;
  line-height: 1.4;
}
.organizer-affil a { color: var(--ink-mid); }
.organizer-bio {
  font-size: var(--size-sm);
  color: var(--ink-mid);
  line-height: 1.6;
}

/* ── Track cards (CFP) ── */
.tracks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--ink);
  background: var(--paper);
}
.track {
  padding: 2rem 2.25rem;
  border-right: 1px solid var(--rule);
}
.track:last-child { border-right: none; }
.track.recommended { background: var(--accent-pale); }
.track-num {
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.75rem;
}
.track-title {
  font-family: var(--font-display);
  font-size: var(--size-xl);
  font-weight: 700;
  margin-bottom: 0.9rem;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--ink);
}
.track-desc {
  font-size: var(--size-sm);
  color: var(--ink-mid);
  line-height: 1.6;
  margin-bottom: 1.1rem;
}
.track-spec {
  font-size: var(--size-sm);
  list-style: none;
  font-family: var(--font-ui);
}
.track-spec li {
  display: flex;
  gap: 0.55rem;
  margin-bottom: 0.35rem;
  color: var(--ink-mid);
  align-items: baseline;
}
.track-spec li::before {
  content: '+';
  color: var(--accent);
  font-weight: 500;
  flex-shrink: 0;
  font-family: var(--font-mono);
}

/* ── Callout ── */
.callout {
  border: 1px solid var(--ink);
  border-left: 3px solid var(--accent);
  padding: 1.4rem 1.75rem;
  margin: 1.5rem 0;
  background: var(--paper);
  border-radius: 2px;
}
.callout-label {
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.6rem;
}
.callout h4 {
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: 0.5rem;
  color: var(--ink);
}
.callout p, .callout li {
  font-size: var(--size-sm);
  color: var(--ink-mid);
  line-height: 1.6;
}
.callout ul { margin: 0.5rem 0 0 1rem; list-style: disc; }
.callout li { margin-bottom: 0.3rem; }

/* ── Page hero ── */
.page-hero {
  padding: clamp(2.25rem, 5vw, 3.5rem) var(--gap) clamp(1.75rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--rule);
}
.page-hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.page-hero-label {
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1rem;
}
.page-hero h1 {
  font-family: var(--font-display);
  font-size: var(--size-2xl);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  max-width: 24ch;
  color: var(--ink);
}
.page-hero-lede {
  font-family: var(--font-ui);
  font-style: normal;
  font-size: var(--size-md);
  color: var(--ink-mid);
  margin-top: 1rem;
  max-width: 62ch;
  line-height: 1.55;
}

/* ── Proposal layout ── */
.proposal-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 3.5rem;
  align-items: start;
  padding: clamp(2rem, 4vw, 3.5rem) var(--gap);
  max-width: var(--max-w);
  margin: 0 auto;
}
.proposal-toc {
  position: sticky;
  top: 4.5rem;
}
.toc-label {
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1rem;
}
.toc-list { list-style: none; }
.toc-list li a {
  display: block;
  padding: 0.4rem 0;
  font-size: var(--size-sm);
  color: var(--ink-mid);
  text-decoration: none;
  transition: color 0.15s, padding 0.15s;
  border-bottom: 1px solid var(--rule-soft);
}
.toc-list li a:hover {
  color: var(--accent-deep);
  padding-left: 0.4rem;
}

/* ── Papers placeholder ── */
.placeholder-card {
  padding: 2.5rem 2rem;
  border: 1px dashed var(--rule);
  background: var(--paper);
  text-align: left;
  border-radius: 2px;
}
.placeholder-card .doc-num { display: block; margin-bottom: 0.75rem; }
.placeholder-card .title {
  font-family: var(--font-display);
  font-size: var(--size-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  color: var(--ink);
}
.placeholder-card .body {
  font-size: var(--size-sm);
  color: var(--ink-mid);
  max-width: 55ch;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--ink);
  padding: 2.25rem var(--gap);
  background: var(--ink);
  color: var(--paper);
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  align-items: start;
}
.footer-left {
  font-family: var(--font-ui);
  font-style: normal;
  font-size: var(--size-sm);
  color: var(--paper);
  opacity: 0.78;
  line-height: 1.55;
}
.footer-right {
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  color: var(--paper);
  opacity: 0.7;
  text-align: right;
  line-height: 1.75;
  letter-spacing: 0.02em;
}
.footer-right a { color: var(--paper); }
.footer-right a:hover { color: var(--accent-pale); }

/* ── Responsive ── */
@media (max-width: 900px) {
  .section-header { grid-template-columns: 1fr; gap: 0.5rem; margin-bottom: 1.75rem; }
  .organizer-row { grid-template-columns: 56px 1fr; gap: 0.9rem 1.1rem; padding: 1.1rem 0; }
  .organizer-row .organizer-bio { grid-column: 1 / -1; margin-top: 0.1rem; }
  .organizer-photo { width: 56px; height: 56px; }
  .organizer-photo.placeholder { font-size: 0.85rem; }
  .organizer-name { font-size: var(--size-base); }
  .organizer-affil { margin-top: 0.2rem; }
}
@media (max-width: 480px) {
  .organizer-row { grid-template-columns: 48px 1fr; gap: 0.75rem 0.9rem; }
  .organizer-photo { width: 48px; height: 48px; }
  .organizer-photo.placeholder { font-size: 0.75rem; }
}
@media (max-width: 768px) {
  body { background-image: none; }
  .tracks { grid-template-columns: 1fr; }
  .track { border-right: none; border-bottom: 1px solid var(--rule); }
  .track:last-child { border-bottom: none; }
  .theme-row { grid-template-columns: 56px 1fr; gap: 1rem; }
  .proposal-layout { grid-template-columns: 1fr; gap: 1.5rem; }
  .proposal-toc { display: none; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-right { text-align: left; }
  [style*="grid-template-columns: 1fr 1fr"] { grid-template-columns: 1fr !important; }
  .prose[style*="grid-template-columns"] { display: block !important; }

  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 3.5rem;
    right: 0;
    left: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--ink);
    flex-direction: column;
    padding: 0.5rem var(--gap) 1rem;
    z-index: 101;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; list-style: none; }
  .nav-links a {
    display: block;
    width: 100%;
    padding: 0.7rem 0;
    text-align: left;
    border-bottom: 1px solid var(--rule);
    font-size: var(--size-base);
  }
  .nav-links li:last-child a { border-bottom: none; }
  .nav-links a.nav-cta {
    margin: 0.75rem 0 0;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
}