:root {
  --blue: #003DA5;
  --blue-900: #00244D;
  --blue-700: #53C3EE;
  --gold: #FFC72C;
  --gray-50: #FFFFFF;
  --gray-100: #E3DECB;
  --gray-200: #C8C9C7;
  --bronze: #795D3E;
  --teal: #8FD6BD;
  --green: #8EE764;
  --orange: #ED8B00;
  --text: #00244D;
  --muted: #00244D;
  --surface: #FFFFFF;
  --border: rgba(200, 201, 199, 0.7);
  --shadow: 0 18px 34px rgba(0, 36, 77, 0.12);
  --soft-shadow: 0 8px 20px rgba(0, 36, 77, 0.08);
  --radius: 16px;
  --radius-sm: 10px;
  --container: 1160px;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.25rem;
  --space-6: 3rem;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background: var(--gray-50);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(83, 195, 238, 0.85);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  color: #FFFFFF;
  background: var(--blue);
}

.skip-link:focus {
  top: 1rem;
}

.container {
  width: min(var(--container), calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(0, 36, 77, 0.35);
  background: var(--blue);
  backdrop-filter: blur(16px);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.brand-logos,
.footer-logos,
.hero-brand-card {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.brand-logos {
  padding: 0.35rem 0.55rem;
  border-radius: var(--radius-sm);
  background: var(--blue-900);
}

.brand-logos img {
  width: auto;
  height: 46px;
  max-width: 220px;
  object-fit: contain;
}

.brand-name {
  font-weight: 900;
  letter-spacing: 0.03em;
  color: #FFFFFF;
  white-space: nowrap;
  font-size: 0.95rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.nav-links a {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding: 0.48rem 0.72rem;
  border-radius: 999px;
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.95rem;
  transition: background-color 180ms ease, color 180ms ease;
}

.nav-links a:hover {
  color: #FFFFFF;
  background: var(--blue-900);
}

body[data-page="home"] .nav-links a[href="index.html"],
body[data-page="speakers"] .nav-links a[href="speakers.html"],
body[data-page="session"] .nav-links a[href*="schedule"],
body[data-page="venue"] .nav-links a[href="venue.html"] {
  color: #FFFFFF;
  background: var(--blue-900);
}

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #FFFFFF;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 4px auto;
  background: var(--blue-900);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 4.25rem 0;
  color: #FFFFFF;
  background:
    linear-gradient(90deg, rgba(0, 36, 77, 0.92), rgba(0, 61, 165, 0.84)),
    url("../images/backgrounds/hero-pattern.svg") center / cover;
}

.hero-grid,
.feature-grid,
.venue-layout,
.footer-grid {
  display: grid;
  gap: 1.2rem;
}

.hero-grid {
  grid-template-columns: minmax(0, 1.28fr) minmax(280px, 0.58fr);
  align-items: center;
}

.hero-grid > *,
.feature-grid > *,
.venue-layout > *,
.footer-grid > *,
.speaker-grid > *,
.timeline > * {
  min-width: 0;
}

.eyebrow,
.card-label {
  margin: 0 0 0.65rem;
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.74rem;
  font-weight: 900;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  max-width: 820px;
  font-size: clamp(2.45rem, 5.4vw, 4.7rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.hero-subhead {
  margin: 1rem 0 0;
  font-size: clamp(1.25rem, 2vw, 1.55rem);
  font-weight: 900;
}

.hero-date {
  margin: 0.2rem 0 0;
  color: rgba(255, 255, 255, 0.84);
  font-size: 1.12rem;
}

.hero-actions,
.venue-actions,
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
}

.hero-actions {
  margin-top: 1.35rem;
}

.btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.7rem 1rem;
  font-weight: 900;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease, border-color 160ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--soft-shadow);
}

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

.hero .btn-primary {
  color: var(--blue);
  background: #FFFFFF;
}

.btn-secondary {
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.36);
  background: rgba(255, 255, 255, 0.09);
}

.btn-outline {
  color: var(--blue);
  border-color: rgba(0, 61, 165, 0.18);
  background: #FFFFFF;
}

.hero-panel {
  display: grid;
  gap: 1rem;
  justify-items: center;
}

.hero-brand-card,
.countdown-card,
.feature-card,
.quick-card,
.search-shell,
.session-card,
.speaker-card,
.venue-card,
.announcement-card,
.session-detail-card,
.toolbar {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--soft-shadow);
}

.hero-brand-card,
.countdown-card {
  padding: 0.9rem;
}

.hero-brand-card {
  width: min(100%, 300px);
  justify-content: center;
  justify-self: center;
  background: var(--blue-900);
}

.hero-brand-card img {
  width: auto;
  height: 96px;
  max-width: 260px;
  object-fit: contain;
}

.countdown-card {
  width: 100%;
}

.countdown-card h2 {
  margin: 0;
  color: var(--text);
  font-size: 1.1rem;
  line-height: 1.25;
}

.countdown,
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: 1rem;
}

.countdown div,
.stats-grid div {
  min-width: 0;
  padding: 0.7rem;
  border-radius: var(--radius-sm);
  text-align: center;
  background: var(--gray-100);
}

.countdown strong,
.stats-grid strong {
  display: block;
  color: var(--blue);
  font-size: 1.35rem;
  line-height: 1;
}

.countdown span,
.stats-grid span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.section,
.page-hero {
  padding: 3.5rem 0;
}

.section-soft {
  background: #FFFFFF;
}

.section-heading {
  margin-bottom: 1.35rem;
}

.split-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
}

.section-heading h2,
.feature-card h2,
.quick-card h2 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.65rem, 2.5vw, 2.25rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.section-heading p:not(.eyebrow),
.page-hero p,
.venue-card p,
.announcement-card p {
  color: var(--muted);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tab-btn {
  min-height: 40px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.55rem 0.85rem;
  color: var(--muted);
  background: #FFFFFF;
  font-weight: 900;
  cursor: pointer;
}

.tab-btn.active {
  color: #FFFFFF;
  background: var(--blue);
  border-color: var(--blue);
}

.timeline {
  display: grid;
  gap: 1rem;
}

.daily-logistics {
  display: grid;
  gap: 0.75rem;
  margin: -0.25rem 0 1.35rem;
}

.daily-logistics h3 {
  margin: 0;
  color: var(--ink);
  font-size: 1rem;
}

.daily-logistics-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.logistics-card {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.55rem;
  align-items: center;
  min-height: 42px;
  padding: 0.5rem 0.75rem;
  border: 1px solid rgba(11, 61, 124, 0.18);
  border-radius: 999px;
  background: #FFFFFF;
  box-shadow: var(--soft-shadow);
}

.logistics-card span {
  color: #FFFFFF;
  font-size: 0.78rem;
  font-weight: 900;
  line-height: 1;
  padding: 0.28rem 0.45rem;
  border-radius: 999px;
  background: var(--blue);
}

.logistics-card strong {
  color: var(--ink);
  font-size: 0.88rem;
  line-height: 1.25;
}

.timeline-block {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 0.9rem;
  position: relative;
}

.timeline-time {
  position: sticky;
  top: 88px;
  align-self: start;
  padding: 0.7rem 0.8rem;
  border-radius: var(--radius-sm);
  color: var(--blue);
  background: #FFFFFF;
  box-shadow: var(--soft-shadow);
  font-weight: 900;
  white-space: nowrap;
}

.timeline-sessions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
  gap: 0.85rem;
}

.session-card {
  overflow: hidden;
  height: 100%;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.session-card:hover,
.speaker-card:hover,
.venue-card:hover,
.announcement-card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.session-card a {
  display: grid;
  gap: 0.65rem;
  height: 100%;
  padding: 1rem;
}

.agenda-card {
  border-color: rgba(11, 61, 124, 0.16);
  background: #FFFFFF;
  grid-column: 1 / -1;
}

.agenda-card-body {
  display: grid;
  gap: 0.65rem;
  height: 100%;
  padding: 1rem;
}

.session-card.keynote {
  border-color: rgba(255, 199, 44, 0.5);
  grid-column: 1 / -1;
}

.session-topline,
.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  color: var(--blue);
  font-weight: 900;
}

.session-card h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.28;
}

.session-card p,
.speaker-card p {
  margin: 0;
  color: var(--muted);
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  color: var(--blue);
  background: var(--gray-100);
  font-size: 0.78rem;
  font-weight: 900;
}

.feature-grid {
  grid-template-columns: 1.25fr 0.75fr;
}

.feature-card,
.quick-card,
.search-shell,
.session-detail-card {
  padding: 1.25rem;
}

.keynote-card {
  background: var(--surface);
  border-top: 3px solid rgba(255, 199, 44, 0.55);
}

.search-shell {
  display: grid;
  gap: 1rem;
}

.global-search,
.speaker-search,
#speaker-filter {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.85rem 1rem;
  color: var(--text);
  background: #FFFFFF;
}

.search-results {
  display: grid;
  gap: 0.75rem;
}

.search-result,
.related-card {
  display: grid;
  gap: 0.35rem;
  padding: 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--gray-50);
}

.search-result small,
.related-card span {
  color: var(--muted);
}

.speaker-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.speaker-card {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1rem;
  height: 100%;
}

.preview-grid .speaker-card:nth-child(n + 7) {
  display: none;
}

.speaker-photo {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(255, 199, 44, 0.28);
  background: var(--gray-100);
}

.speaker-card h3 {
  margin: 0;
  line-height: 1.22;
  font-size: 1.05rem;
}

.speaker-credentials {
  color: var(--blue) !important;
  font-weight: 900;
}

.speaker-org {
  font-weight: 800;
}

.speaker-sessions {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.speaker-sessions h4 {
  margin: 0 0 0.35rem;
  font-size: 0.84rem;
}

.speaker-sessions ul {
  margin: 0;
  padding-left: 1rem;
  color: var(--muted);
}

.speaker-sessions li {
  margin-bottom: 0.55rem;
}

.read-more-btn {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  justify-content: center;
  margin-top: 0.3rem;
  border: 1px solid rgba(0, 61, 165, 0.18);
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  color: var(--blue);
  background: #FFFFFF;
  font-size: 0.84rem;
  font-weight: 900;
  cursor: pointer;
}

.read-more-btn:hover {
  color: #FFFFFF;
  background: var(--blue);
}

body.modal-open {
  overflow: hidden;
}

.speaker-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(0, 36, 77, 0.58);
}

.speaker-modal-panel {
  position: relative;
  width: min(760px, 100%);
  max-height: min(84vh, 860px);
  overflow: auto;
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  color: var(--text);
  background: #FFFFFF;
  box-shadow: var(--shadow);
}

.modal-close {
  position: absolute;
  top: 0.8rem;
  right: 0.8rem;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--blue-900);
  background: #FFFFFF;
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
}

.speaker-profile-head {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 1rem;
  align-items: center;
  padding-right: 3rem;
}

.speaker-profile-head .speaker-photo {
  width: 84px;
  height: 84px;
}

.speaker-profile-head h2 {
  margin: 0;
  line-height: 1.12;
}

.profile-sessions {
  display: grid;
  gap: 1rem;
  margin-top: 1.2rem;
}

.profile-session {
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.profile-session h3 {
  margin: 0 0 0.55rem;
  line-height: 1.22;
}

.profile-description {
  white-space: pre-wrap;
}

.toolbar {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 0.8rem;
  padding: 1rem;
  margin-bottom: 0.8rem;
}

.result-count {
  margin-bottom: 1rem;
  color: var(--muted);
  font-weight: 800;
}

.venue-layout {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.venue-card {
  padding: 1rem;
}

.venue-map-card {
  padding: 0.65rem;
}

.home-map-embed {
  display: block;
  width: 100%;
  height: 260px;
  border-radius: var(--radius-sm);
  background: var(--gray-100);
}

.venue-card h3,
.announcement-card h3 {
  margin: 0 0 0.45rem;
  display: block;
}

.map-art {
  position: relative;
  min-height: 210px;
  margin-bottom: 1rem;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background:
    linear-gradient(90deg, transparent 48%, rgba(0, 61, 165,.18) 48% 52%, transparent 52%),
    linear-gradient(0deg, transparent 48%, rgba(0, 61, 165,.16) 48% 52%, transparent 52%),
    var(--gray-100);
}

.pin {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 4px solid #FFFFFF;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 8px rgba(0, 61, 165,.12);
}

.pin-building {
  left: 28%;
  top: 35%;
}

.pin-parking {
  right: 22%;
  bottom: 26%;
  background: var(--blue);
}

.route-line {
  position: absolute;
  left: 34%;
  top: 45%;
  width: 42%;
  height: 4px;
  border-radius: 999px;
  background: var(--blue);
  transform: rotate(18deg);
}

.text-link {
  color: var(--blue);
  font-weight: 900;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.announcement-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 1rem;
}

.announcement-card {
  padding: 1rem;
  height: 100%;
}

code {
  padding: 0.1rem 0.35rem;
  border-radius: 6px;
  color: var(--blue);
  background: var(--gray-100);
}

.page-hero {
  background:
    linear-gradient(135deg, rgba(255,255,255,.92), rgba(227, 222, 203,.92)),
    radial-gradient(circle at 80% 10%, rgba(255, 199, 44,.18), transparent 28%);
}

.page-hero h1 {
  color: var(--text);
  font-size: clamp(2.3rem, 5vw, 4.5rem);
}

.session-detail-card h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1.04;
}

.session-detail-card h2 {
  margin: 1.4rem 0 0.45rem;
}

.mini-speaker {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 0.75rem;
  align-items: start;
  padding: 0.8rem;
  border-radius: var(--radius-sm);
  background: var(--gray-50);
}

.mini-speaker img {
  width: 58px;
  height: 58px;
  border-radius: 50%;
}

.site-footer {
  padding: 2.25rem 0;
  color: rgba(255,255,255,.82);
  background: var(--blue-900);
}

.footer-grid {
  grid-template-columns: minmax(0, 1.2fr) minmax(180px, 0.7fr) minmax(220px, 1fr);
  align-items: start;
}

.footer-grid h3 {
  margin: 0 0 0.6rem;
  color: #FFFFFF;
}

.footer-grid a {
  display: block;
  margin: 0.28rem 0;
  color: rgba(255,255,255,.86);
}

.footer-logos {
  margin-bottom: 0.8rem;
  gap: 0.75rem;
}

.footer-logos img {
  width: auto;
  height: 44px;
  max-width: 240px;
  object-fit: contain;
}

.back-to-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 40;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #FFFFFF;
  background: var(--blue);
  box-shadow: var(--shadow);
}

.loading-screen {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  gap: 1rem;
  color: #FFFFFF;
  background: var(--blue-900);
  transition: opacity 300ms ease, visibility 300ms ease;
}

.loading-screen.loaded {
  opacity: 0;
  visibility: hidden;
}

.loading-logos {
  display: flex;
  gap: 0.8rem;
}

.loading-logos img {
  height: 58px;
  width: auto;
  max-width: 280px;
  object-fit: contain;
}

.empty-state {
  padding: 1rem;
  border-radius: var(--radius-sm);
  color: var(--muted);
  background: var(--gray-100);
}

@media (prefers-color-scheme: dark) {
  :root {
    --gray-50: #FFFFFF;
    --gray-100: #E3DECB;
    --gray-200: #C8C9C7;
    --surface: #FFFFFF;
    --text: #00244D;
    --muted: #00244D;
    --border: rgba(0, 36, 77, 0.12);
  }

  .section-soft,
  .tab-btn,
  .btn-outline,
  .global-search,
  .speaker-search,
  #speaker-filter {
    background: #FFFFFF;
  }

  .site-header {
    background: var(--blue);
  }

  .countdown-card,
  .feature-card,
  .quick-card,
  .search-shell,
  .session-card,
  .speaker-card,
  .venue-card,
  .announcement-card,
  .session-detail-card,
  .toolbar,
  .search-result,
  .related-card,
  .timeline-time,
  .empty-state {
    background: #FFFFFF;
    color: var(--text);
  }

  .brand-logos,
  .hero-brand-card {
    background: var(--blue-900);
  }

  .countdown div,
  .stats-grid div,
  .chip,
  code,
  .mini-speaker,
  .map-art {
    background: var(--gray-100);
  }

  .nav-links a,
  .section-heading p:not(.eyebrow),
  .page-hero p,
  .venue-card p,
  .announcement-card p,
  .session-card p,
  .speaker-card p,
  .search-result small,
  .related-card span,
  .countdown span,
  .stats-grid span {
    color: var(--muted);
  }

  .session-card h3,
  .speaker-card h3,
  .venue-card h3,
  .announcement-card h3,
  .countdown-card h2,
  .section-heading h2,
  .feature-card h2,
  .quick-card h2,
  .brand-name,
  .page-hero h1 {
    color: var(--text);
  }

  .session-topline,
  .detail-meta,
  .chip,
  .text-link {
    color: var(--blue);
  }
}