/* =========================================================
   CHIWork 2026 Workshop — Interrogating GenAI Augmentation
   Design: Editorial/academic, warm, typographically rich
   Fonts: Cormorant Garamond (display) + DM Sans (UI/body)
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,600;0,700;1,400;1,600&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300;1,9..40,400&display=swap');

/* ── Design tokens ── */
:root {
  --cream:        oklch(96.5% 0.012 80);
  --cream-dark:   oklch(92%   0.016 80);
  --ink:          oklch(16%   0.018 265);
  --ink-mid:      oklch(38%   0.018 265);
  --ink-light:    oklch(58%   0.014 265);
  --burgundy:     oklch(38%   0.13  18);
  --burgundy-mid: oklch(52%   0.11  18);
  --burgundy-pale:oklch(93%   0.03  18);
  --rule:         oklch(84%   0.018 80);

  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-ui:      'DM Sans', system-ui, sans-serif;

  --size-xs:   0.75rem;
  --size-sm:   0.875rem;
  --size-base: 1rem;
  --size-md:   1.125rem;
  --size-lg:   1.375rem;
  --size-xl:   clamp(1.6rem, 2.2vw, 2rem);
  --size-2xl:  clamp(2.2rem, 3.5vw, 3rem);
  --size-3xl:  clamp(3rem,   5vw,   4.5rem);

  --max-w: 1100px;
  --col-prose: 68ch;
  --gap: clamp(1.5rem, 4vw, 3rem);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: var(--size-base);
  font-weight: 300;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--burgundy); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--burgundy-mid); }

/* ── Nav ── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--cream);
  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;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: var(--size-md);
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.nav-logo span {
  color: var(--burgundy);
}
.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  align-items: center;
}
.nav-links a {
  font-family: var(--font-ui);
  font-size: var(--size-sm);
  font-weight: 400;
  color: var(--ink-mid);
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border-radius: 3px;
  transition: color 0.15s, background 0.15s;
  letter-spacing: 0.02em;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
  background: var(--cream-dark);
}
.nav-links a.nav-cta {
  background: var(--burgundy);
  color: var(--cream);
  font-weight: 500;
}
.nav-links a.nav-cta:hover {
  background: var(--burgundy-mid);
  color: var(--cream);
}

/* ── Page layout ── */
.page-wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

/* ── Hero ── */
.hero {
  padding: clamp(3rem, 7vw, 6rem) var(--gap) clamp(2rem, 4vw, 3.5rem);
  border-bottom: 1px solid var(--rule);
}
.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.hero-label {
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--burgundy);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.hero-label::before {
  content: '';
  display: inline-block;
  width: 2rem;
  height: 1px;
  background: var(--burgundy);
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--size-3xl);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 18ch;
  margin-bottom: 1.75rem;
}
.hero-title em {
  font-style: italic;
  color: var(--burgundy);
}
.hero-meta {
  font-family: var(--font-ui);
  font-size: var(--size-sm);
  font-weight: 400;
  color: var(--ink-mid);
  margin-bottom: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.hero-meta-item::before {
  content: '◆';
  font-size: 0.45rem;
  color: var(--burgundy);
}
.hero-split {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
}
.hero-text { min-width: 0; }
.hero-illustration {
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-icon-img {
  width: clamp(400px, 20vw, 600px);
  height: auto;
  opacity: 0.9;
}
.hero-abstract {
  font-size: var(--size-md);
  font-weight: 300;
  line-height: 1.7;
  color: var(--ink-mid);
  max-width: 70ch;
  margin-bottom: 2.5rem;
  font-family: var(--font-display);
  font-style: italic;
}
.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: 0.03em;
  padding: 0.7rem 1.4rem;
  border-radius: 3px;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn-primary {
  background: var(--burgundy);
  color: var(--cream);
  border: 1px solid var(--burgundy);
}
.btn-primary:hover {
  background: var(--burgundy-mid);
  color: var(--cream);
  border-color: var(--burgundy-mid);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--rule);
}
.btn-ghost:hover {
  background: var(--cream-dark);
  border-color: var(--ink-light);
  color: var(--ink);
}

/* ── Section ── */
.section {
  padding: clamp(2.5rem, 5vw, 4rem) var(--gap);
  border-bottom: 1px solid var(--rule);
}
.section:last-of-type { border-bottom: none; }
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.section-header {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: 2rem 3rem;
  margin-bottom: 2.5rem;
  align-items: baseline;
}
.section-label {
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--ink-light);
  padding-top: 0.35rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--size-2xl);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

/* ── Themes grid ── */
.themes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}
.theme-item {
  padding: 1.75rem 2rem 1.75rem 0;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.theme-item:nth-child(2n) { padding-right: 0; padding-left: 2rem; border-right: none; }
.theme-item:nth-last-child(-n+2) { border-bottom: none; }
.theme-num {
  font-family: var(--font-display);
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--burgundy);
  margin-bottom: 0.75rem;
}
.theme-icon {
  color: var(--burgundy);
  margin-bottom: 0.75rem;
  line-height: 1;
}
.theme-icon svg {
  display: block;
}
.theme-title {
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: 600;
  margin-bottom: 0.6rem;
  line-height: 1.2;
}
.theme-body {
  font-size: var(--size-sm);
  color: var(--ink-mid);
  line-height: 1.6;
}

/* ── Dates table ── */
.dates-table {
  width: 100%;
  border-collapse: collapse;
}
.dates-table th,
.dates-table td {
  padding: 0.9rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--rule);
  font-size: var(--size-sm);
}
.dates-table th {
  font-weight: 500;
  font-size: var(--size-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-light);
  background: var(--cream-dark);
}
.dates-table td:first-child { font-weight: 500; white-space: nowrap; }
.dates-table td:last-child { color: var(--ink-mid); }
.date-tbd { color: var(--ink-light); font-style: italic; }
.date-past { text-decoration: line-through; color: var(--ink-light); }
.date-highlight td { background: var(--burgundy-pale); }
.date-highlight td:first-child { color: var(--burgundy); }

/* ── Prose ── */
.prose {
  max-width: var(--col-prose);
  font-size: var(--size-md);
  line-height: 1.75;
}
.prose h2 {
  font-family: var(--font-display);
  font-size: var(--size-xl);
  font-weight: 600;
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.01em;
}
.prose h3 {
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: 600;
  margin: 2rem 0 0.75rem;
}
.prose p { margin-bottom: 1.25rem; }
.prose ul, .prose ol {
  margin: 1rem 0 1.5rem 1.5rem;
}
.prose li { margin-bottom: 0.5rem; }
.prose strong { font-weight: 500; }
.prose em { font-style: italic; }
.prose a { color: var(--burgundy); }
.prose blockquote {
  border-left: 3px solid var(--burgundy);
  padding: 0.5rem 0 0.5rem 1.5rem;
  color: var(--ink-mid);
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--size-lg);
  margin: 1.5rem 0;
}

/* ── Code blocks ── */
pre, code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.875em;
}
pre {
  background: var(--ink);
  color: var(--cream);
  padding: 1.5rem;
  border-radius: 4px;
  overflow-x: auto;
  line-height: 1.6;
  margin: 1.5rem 0;
}
code {
  background: var(--cream-dark);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  color: var(--burgundy);
}
pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* ── Organizer grid ── */
.organizers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}
.organizer {
  padding: 2rem 2.5rem 2rem 0;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 0 1.25rem;
  align-items: start;
}
.organizer:nth-child(even) {
  padding-right: 0;
  padding-left: 2.5rem;
  border-right: none;
}
.organizer-photo {
  grid-column: 1;
  grid-row: 1 / 5;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  object-position: top center;
  background: var(--cream-dark);
  flex-shrink: 0;
}
.organizer-photo-placeholder {
  grid-column: 1;
  grid-row: 1 / 5;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--cream-dark);
  border: 1px solid var(--rule);
  flex-shrink: 0;
}
.organizer-name {
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: 600;
  margin-bottom: 0.15rem;
  grid-column: 2;
}
.organizer-role {
  font-size: var(--size-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--burgundy);
  font-weight: 500;
  margin-bottom: 0.35rem;
  grid-column: 2;
}
.organizer-affil {
  font-size: var(--size-sm);
  color: var(--ink-mid);
  margin-bottom: 0.6rem;
  grid-column: 2;
}
.organizer-bio {
  font-size: var(--size-sm);
  color: var(--ink-mid);
  line-height: 1.6;
  grid-column: 2;
}

/* ── Track cards ── */
.tracks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--rule);
}
.track {
  padding: 2.5rem;
  border-right: 1px solid var(--rule);
}
.track:last-child { border-right: none; }
.track-num {
  font-size: var(--size-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--burgundy);
  font-weight: 500;
  margin-bottom: 0.75rem;
}
.track-title {
  font-family: var(--font-display);
  font-size: var(--size-xl);
  font-weight: 600;
  margin-bottom: 1rem;
  line-height: 1.2;
}
.track-desc {
  font-size: var(--size-sm);
  color: var(--ink-mid);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}
.track-spec {
  font-size: var(--size-sm);
  line-height: 1.6;
  list-style: none;
}
.track-spec li {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 0.4rem;
  color: var(--ink-mid);
}
.track-spec li::before {
  content: '→';
  color: var(--burgundy);
  flex-shrink: 0;
}

/* ── Template box ── */
.template-box {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--burgundy);
  padding: 1.5rem 2rem;
  margin: 1.5rem 0;
  background: var(--cream-dark);
}
.template-box-label {
  font-size: var(--size-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--burgundy);
  font-weight: 500;
  margin-bottom: 0.6rem;
}
.template-box h4 {
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.template-box p, .template-box li {
  font-size: var(--size-sm);
  color: var(--ink-mid);
  line-height: 1.6;
}
.template-box ul { margin: 0.5rem 0 0 1rem; list-style: disc; }
.template-box li { margin-bottom: 0.3rem; }

/* ── Papers list ── */
.papers-list { list-style: none; }
.paper-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--rule);
}
.paper-item:last-child { border-bottom: none; }
.paper-title {
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: 600;
  margin-bottom: 0.35rem;
}
.paper-authors {
  font-size: var(--size-sm);
  color: var(--ink-mid);
}

/* ── Page hero (inner pages) ── */
.page-hero {
  padding: clamp(2.5rem, 5vw, 4rem) var(--gap) clamp(1.5rem, 3vw, 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-ui);
  font-size: var(--size-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--burgundy);
  font-weight: 500;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.page-hero-label::before {
  content: '';
  display: inline-block;
  width: 1.5rem;
  height: 1px;
  background: var(--burgundy);
}
.page-hero h1 {
  font-family: var(--font-display);
  font-size: var(--size-2xl);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  max-width: 22ch;
}

/* ── Proposal layout ── */
.proposal-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 4rem;
  align-items: start;
  padding: clamp(2rem, 4vw, 3.5rem) var(--gap);
  max-width: var(--max-w);
  margin: 0 auto;
}
.proposal-toc {
  position: sticky;
  top: 5rem;
}
.toc-label {
  font-size: var(--size-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-light);
  font-weight: 500;
  margin-bottom: 0.75rem;
}
.toc-list {
  list-style: none;
  border-left: 1px solid var(--rule);
}
.toc-list li a {
  display: block;
  padding: 0.35rem 0.75rem;
  font-size: var(--size-sm);
  color: var(--ink-mid);
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s;
  border-left: 2px solid transparent;
  margin-left: -1px;
}
.toc-list li a:hover {
  color: var(--burgundy);
  border-left-color: var(--burgundy);
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: 2rem var(--gap);
  background: var(--cream-dark);
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.footer-left {
  font-family: var(--font-display);
  font-size: var(--size-sm);
  color: var(--ink-mid);
}
.footer-right {
  font-size: var(--size-xs);
  color: var(--ink-light);
  text-align: right;
  line-height: 1.5;
}
.footer-right a { color: var(--ink-light); }
.footer-right a:hover { color: var(--burgundy); }

/* ── Hamburger toggle ── */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
  color: var(--ink);
  font-size: 1.2rem;
  line-height: 1;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .section-header { grid-template-columns: 1fr; gap: 0.5rem; margin-bottom: 1.75rem; }
  .tracks { grid-template-columns: 1fr; }
  .track { border-right: none; border-bottom: 1px solid var(--rule); }
  .track:last-child { border-bottom: none; }
  .themes-grid { grid-template-columns: 1fr; }
  .theme-item, .theme-item:nth-child(2n) { padding: 1.5rem 0; border-right: none; }
  .organizers-grid { grid-template-columns: 1fr; }
  .organizer, .organizer:nth-child(even) {
    padding: 1.5rem 0;
    border-right: none;
    grid-template-columns: 64px 1fr;
    gap: 0 1rem;
  }
  .hero-split { grid-template-columns: 1fr; }
  .hero-illustration { display: none; }
  .proposal-layout { grid-template-columns: 1fr; }
  .proposal-toc { display: none; }

  /* Two-column framework grid → single column */
  [style*="grid-template-columns: 1fr 1fr"] { grid-template-columns: 1fr !important; }

  /* Two-column prose → single column */
  .prose[style*="grid-template-columns"] { display: block !important; }

  /* Nav: hamburger menu */
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 3.5rem;
    left: 0;
    right: 0;
    background: var(--cream);
    border-bottom: 1px solid var(--rule);
    flex-direction: column;
    padding: 0.5rem var(--gap) 1rem;
    gap: 0;
    z-index: 101;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 0.6rem 0;
    font-size: var(--size-base);
  }
  .nav-links a.nav-cta {
    margin-top: 0.5rem;
    text-align: center;
  }
}

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

/* ── Utilities ── */
.text-burgundy { color: var(--burgundy); }
.text-muted { color: var(--ink-mid); }
.divider { height: 1px; background: var(--rule); margin: 2rem 0; }
.mt-0 { margin-top: 0; }