:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f4f6f9;
  --color-text: #1c2430;
  --color-text-muted: #566072;
  --color-primary: #39656d;
  --color-primary-dark: #26454b;
  --color-accent: #6abdc8;
  --color-accent-text: #2c5960;
  --color-border: #e2e6ec;
  --max-width: 1080px;
  --radius: 10px;
  font-size: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3 {
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.2;
  color: var(--color-text);
}

h2 {
  font-size: 1.9rem;
  margin-bottom: 1.2rem;
  border-bottom: 3px solid var(--color-primary);
  display: inline-block;
  padding-bottom: 0.3rem;
}

a { color: var(--color-primary-dark); }

.todo {
  color: var(--color-accent-text);
  font-weight: 600;
}

/* Header / Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
}

.nav-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo {
  height: 38px;
  width: auto;
  display: block;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a:hover { color: var(--color-primary); }

.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 8px 14px;
  border-radius: 6px;
}

.nav-cta:hover { background: var(--color-primary-dark); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
}

/* Hero */
.hero {
  background: linear-gradient(160deg, var(--color-bg-alt), var(--color-bg));
  padding: 5rem 0 4rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.8rem;
}

.eyebrow a {
  color: var(--color-primary);
  font-weight: 600;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 1.2rem;
}

.hero-lede {
  max-width: 640px;
  margin: 0 auto 2rem;
  color: var(--color-text-muted);
  font-size: 1.1rem;
}

.hero-meta {
  font-weight: 600;
  color: var(--color-text);
  margin: -1rem 0 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-illustration {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
  margin: 3rem auto 0;
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover { background: var(--color-primary-dark); }

.btn-secondary {
  background: transparent;
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary);
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.format-card, .callout {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 1.2rem 1.5rem;
  margin-top: 1.5rem;
}

.section-alt .format-card,
.section-alt .callout {
  background: var(--color-bg);
}

.topic-list {
  padding-left: 1.2rem;
}

.topic-list li {
  margin-bottom: 0.5rem;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.card-grid-single {
  grid-template-columns: minmax(220px, 1fr);
}

.keynote-card .keynote-title {
  color: var(--color-text);
  margin: 0;
}

.keynote-label {
  margin: 1.4rem 0 0.3rem;
  font-family: Georgia, serif;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
}

.keynote-card .keynote-bio,
.keynote-card .keynote-abstract {
  margin: 0;
}

.card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.4rem;
}

.section .card { background: var(--color-bg-alt); }

.card h3 { margin: 0 0 0.3rem; font-size: 1.1rem; }

.card-affiliation {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0 0 0.4rem;
}

.card-topic {
  font-size: 0.92rem;
  margin: 0;
}

/* Schedule table */
.table-wrap {
  overflow-x: auto;
  margin-top: 1rem;
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 480px;
}

.schedule-table th, .schedule-table td {
  text-align: left;
  padding: 0.25rem 1rem;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
  line-height: 1.3;
}

.schedule-table th {
  background: var(--color-bg);
  font-family: Georgia, serif;
}

.section-alt .schedule-table th { background: var(--color-bg-alt); }

.schedule-row--expanded td {
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  vertical-align: top;
}

.poster-order {
  margin: 0.6rem 0 0;
  padding-left: 1.3rem;
}

.poster-order li {
  margin-bottom: 1rem;
}

.poster-order li:last-child {
  margin-bottom: 0;
}

.poster-title {
  margin: 0;
  font-weight: 600;
}

.poster-authors {
  margin: 0.15rem 0 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Organisers */
.organiser-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.organiser-grid--secondary {
  grid-template-columns: repeat(auto-fit, minmax(280px, 328px));
  justify-content: center;
}

.organiser {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.organiser-photo {
  position: relative;
  width: 96px;
  height: 96px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-primary);
  color: #fff;
  font-family: Georgia, serif;
  font-weight: 700;
  font-size: 1.4rem;
}

.organiser-photo--large {
  width: 260px;
  height: 260px;
  font-size: 3.4rem;
}

.organiser-photo::before {
  content: attr(data-initials);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.organiser-photo img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.organiser h3 { margin: 0 0 0.2rem; text-align: center; }

.organiser .card-affiliation { text-align: center; }

.organiser p.todo { color: var(--color-accent-text); }

/* CTA */
.cta-section {
  text-align: center;
}

.cta-inner p { max-width: 560px; margin-left: auto; margin-right: auto; }

.notice {
  margin-top: 1.5rem;
  padding: 1rem 1.5rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
  max-width: 640px;
}

.notice a { color: var(--color-primary-dark); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-organisers { margin-top: 0.3rem; }

.footer-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: nowrap;
  margin-bottom: 1.5rem;
}

.footer-logo-box {
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-logo-box--manchester {
  width: 130px;
  height: 64px;
}

.footer-logo-box--taros {
  width: 130px;
  height: 36px;
}

.footer-logos img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  display: block;
}

/* Mobile nav */
@media (max-width: 800px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 24px;
    display: none;
    gap: 1rem;
  }

  .nav-links.open { display: flex; }

  .nav-cta { align-self: flex-start; }
}