:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f1f5fb;
  --color-surface: #ffffff;
  --color-border: #dfe7f1;
  --color-text: #1f2937;
  --color-text-muted: #4a5a70;
  --color-heading: #0a1d3a;
  --color-ink: #0a1d3a;
  --color-navy: #14346b;
  --color-primary: #1f4e9c;
  --color-primary-dark: #143869;
  --color-accent: #3a7bd5;

  /* Brass accent — the signature, used with restraint */
  --color-brass: #b9892f;
  --color-brass-soft: #d8b25e;

  /* Accepted status */
  --color-ok-bg: #e7f5ee;
  --color-ok-border: #bfe3cf;
  --color-ok-text: #146c47;
  --color-ok-dot: #1f9d63;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Source Serif 4", "Times New Roman", Georgia, serif;

  --container: 1080px;
  --container-narrow: 760px;
  --radius: 6px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(10, 29, 58, 0.05);
  --shadow-md: 0 10px 30px -12px rgba(10, 29, 58, 0.22);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 78, 156, 0.22);
  transition: border-color .15s ease, color .15s ease;
}
a:hover { color: var(--color-primary-dark); border-bottom-color: var(--color-primary-dark); }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--color-heading);
  line-height: 1.22;
  margin: 0 0 0.6em;
  font-weight: 600;
}

h1 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.015em; }
h2 { font-size: clamp(1.55rem, 2.4vw, 1.95rem); margin-top: 0; }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1em; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.container.narrow { max-width: var(--container-narrow); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* Header — compact sticky bar */
.site-header {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  box-shadow: 0 1px 0 rgba(10, 29, 58, 0.04);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem 2rem;
  min-height: 108px;
  padding-top: 0.35rem;
  padding-bottom: 0.35rem;
  flex-wrap: wrap;
}
.brand { border-bottom: none; display: inline-flex; align-items: center; margin: 0; padding: 0; }
.brand-logo {
  height: 100px;
  width: auto;
  display: block;
  margin: 0;
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.4rem;
  font-size: 0.92rem;
  font-weight: 500;
}
.site-nav a {
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  padding: 0.3rem 0;
}
.site-nav a:hover { color: var(--color-primary); border-bottom-color: var(--color-brass); }

/* Hero — deep-navy "proceedings cover" with node lattice */
.hero {
  position: relative;
  overflow: hidden;
  color: #eaf1fb;
  padding: 2rem 0 2.25rem;
  background:
    radial-gradient(900px 500px at 78% -10%, rgba(58, 123, 213, 0.35), transparent 60%),
    linear-gradient(165deg, #0c2350 0%, #0a1d3a 55%, #081730 100%);
  border-bottom: 3px solid var(--color-brass);
}
.hero .container { width: 100%; }
/* node lattice: dots = nodes, suggesting a distributed/federated network */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(140, 180, 240, 0.18) 1.5px, transparent 1.6px);
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(1000px 600px at 80% 0%, #000 0%, transparent 72%);
          mask-image: radial-gradient(1000px 600px at 80% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero-mid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 2.5rem;
  margin: 0.85rem 0 1.2rem;
}
.hero-copy { min-width: 0; }

/* Hero icon medallion — the workshop systems diagram, featured */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-medallion {
  position: relative;
  width: clamp(200px, 22vw, 290px);
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 42%, rgba(58, 123, 213, 0.28), rgba(12, 30, 60, 0.15) 62%, transparent 72%);
  border: 1px solid rgba(146, 178, 224, 0.28);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 24px 60px -22px rgba(58, 123, 213, 0.55);
  backdrop-filter: blur(2px);
  animation: heroFloat 7s ease-in-out infinite;
}
.hero-medallion .ring {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}
.ring-glow {
  inset: 12%;
  background: radial-gradient(circle, rgba(216, 178, 94, 0.16), transparent 68%);
  filter: blur(6px);
}
.ring-dashed {
  inset: -10px;
  border: 2px dashed rgba(146, 178, 224, 0.35);
  animation: heroSpin 38s linear infinite;
}
.hero-icon {
  position: relative;
  z-index: 1;
  width: 74%;
  height: auto;
  display: block;
  filter: drop-shadow(0 8px 22px rgba(0, 0, 0, 0.35));
}
@keyframes heroFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes heroSpin {
  to { transform: rotate(360deg); }
}
.hero h1 {
  color: #ffffff;
  font-size: clamp(1.8rem, 3.2vw, 2.55rem);
  margin: 0 0 0.85rem;
  max-width: 30ch;
}
.hero .lede {
  font-family: var(--font-serif);
  font-size: clamp(1.02rem, 1.4vw, 1.18rem);
  color: #b9c8e2;
  max-width: 52ch;
  margin-bottom: 0;
}
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-brass-soft);
  margin: 0;
}
.kicker::before {
  content: "";
  width: 34px;
  height: 2px;
  background: var(--color-brass);
  display: inline-block;
}

.status-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--color-ok-dot);
  box-shadow: 0 0 0 4px rgba(31, 157, 99, 0.22);
  flex: 0 0 auto;
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem 2rem;
  margin: 0;
  padding: 1.35rem 1.6rem;
  border: 1px solid rgba(146, 178, 224, 0.22);
  border-radius: var(--radius-lg);
  background: rgba(12, 30, 60, 0.45);
  backdrop-filter: blur(2px);
}
.facts > div { margin: 0; }
.facts dt {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-brass-soft);
  margin-bottom: 0.3rem;
}
.facts dd {
  margin: 0;
  font-size: 0.97rem;
  color: #f1f6fd;
  font-weight: 500;
}

/* Sections */
.section {
  padding: 4rem 0;
}
/* offset anchored jumps for the sticky header */
section[id] { scroll-margin-top: 124px; }
.section-alt {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
/* brass tick above every section heading — the recurring signature */
.section > .container > h2:first-child,
.section > .container > h2.section-head,
.section h2.section-head {
  position: relative;
  padding-top: 1.1rem;
}
.section h2.section-head::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 3px;
  background: var(--color-brass);
  border-radius: 2px;
}
.section-intro {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  color: var(--color-text-muted);
  max-width: 68ch;
  margin-bottom: 2.25rem;
}
.footnote {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-top: 1.75rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--color-border);
}

.objective-list {
  padding-left: 0;
  list-style: none;
}
.objective-list li {
  position: relative;
  margin-bottom: 0.7rem;
  padding-left: 1.6rem;
}
.objective-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-brass);
}

/* Topics */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.4rem;
}
.topic-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.topic-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: #cbd9ec;
}
.topic-card h3 {
  margin-top: 0;
  padding-bottom: 0.65rem;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}
.topic-card ul {
  margin: 0.9rem 0 0;
  padding-left: 1.1rem;
}
.topic-card li { margin-bottom: 0.4rem; }

/* Schedule / tables */
.schedule {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}
.schedule table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.schedule th, .schedule td {
  text-align: left;
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
.schedule thead th {
  background: #0a1d3a;
  color: #eaf1fb;
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.schedule tbody tr { transition: background .15s ease; }
.schedule tbody tr:hover { background: #f6f9fd; }
.schedule tbody tr:last-child td { border-bottom: none; }
.schedule td:first-child {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary-dark);
  font-weight: 600;
  width: 1%;
}

/* Organizers */
.organizer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: 1.4rem;
}
.organizer-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.organizer-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: #cbd9ec;
}
.organizer-photo {
  float: left;
  width: 66px;
  height: 66px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0.15rem 1rem 0.5rem 0;
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px var(--color-border), 0 2px 6px rgba(10, 29, 58, 0.12);
}
.organizer-card h3 {
  margin: 0 0 0.25rem;
  font-size: 1.12rem;
}
.organizer-card .role {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-brass);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.organizer-card .affiliation {
  font-style: italic;
  color: var(--color-text-muted);
  margin: 0 0 0.9rem;
  font-size: 0.93rem;
}
.organizer-card .contact {
  margin-top: 0.6rem;
  font-size: 0.92rem;
}

/* CFP */
.cfp-status {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  background: var(--color-ok-bg);
  border: 1px solid var(--color-ok-border);
  color: var(--color-ok-text);
  padding: 0.9rem 1.15rem;
  border-radius: var(--radius);
  margin-bottom: 1.75rem;
  font-size: 0.97rem;
  font-weight: 500;
}
.cfp-status .status-dot {
  background: var(--color-ok-dot);
  box-shadow: 0 0 0 4px rgba(31, 157, 99, 0.22);
}

/* Contact */
.contact-block {
  background: var(--color-bg-alt);
  border-left: 3px solid var(--color-brass);
  padding: 1.1rem 1.35rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  line-height: 1.7;
}

/* Footer */
.site-footer {
  background: var(--color-ink);
  color: #c2cfe2;
  padding: 3rem 0 2.5rem;
  margin-top: 0;
  border-top: 3px solid var(--color-brass);
}
.site-footer a { color: #9fc2f3; border-bottom-color: rgba(159, 194, 243, 0.35); }
.site-footer a:hover { color: #c8def8; }
.footer-inner {
  display: grid;
  gap: 1.5rem;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.footer-icon {
  height: 52px;
  width: 52px;
  background: #fff;
  padding: 6px;
  border-radius: 8px;
}
.footer-title {
  margin: 0;
  font-family: var(--font-serif);
  color: #fff;
  font-size: 1.08rem;
  font-weight: 600;
}
.footer-sub {
  margin: 0.2rem 0 0;
  font-size: 0.88rem;
  color: #92a4bf;
}
.footer-meta {
  font-size: 0.85rem;
  color: #92a4bf;
  margin: 0;
  max-width: 720px;
}

/* Responsive */
@media (max-width: 720px) {
  .header-inner { gap: 0.4rem 1.25rem; min-height: 76px; }
  .site-nav { gap: 0.25rem 1rem; font-size: 0.85rem; }
  .hero { padding: 2.5rem 0; }
  .hero-mid { grid-template-columns: 1fr; gap: 1.5rem; margin: 1rem 0 1.4rem; }
  .hero-visual { display: none; }
  .facts { grid-template-columns: 1fr; }
  .section { padding: 2.75rem 0; }
  .brand-logo { height: 64px; }
  .facts { padding: 1.35rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
  .topic-card:hover, .organizer-card:hover { transform: none; }
  .hero-medallion, .ring-dashed { animation: none; }
}