:root {
  --ink: #102332;
  --muted: #596b78;
  --navy: #0d3458;
  --navy-deep: #08263e;
  --blue: #1f6fa5;
  --teal: #21877f;
  --gold: #d2a12c;
  --coral: #c85342;
  --line: #d9e2e7;
  --soft: #f1f5f7;
  --white: #ffffff;
  --content: 1180px;
  --shadow: 0 14px 34px rgba(17, 45, 62, 0.09);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  letter-spacing: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body.nav-open {
  overflow: hidden;
}

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

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1000;
  padding: 10px 14px;
  color: var(--white);
  background: var(--navy-deep);
  transform: translateY(-140%);
}

.skip-link:focus {
  transform: translateY(0);
}

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

.content-shell,
.nav-shell {
  width: min(var(--content), calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 70px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(217, 226, 231, 0.9);
  backdrop-filter: blur(14px);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 36px;
  height: 36px;
  background: var(--navy);
  border-radius: 4px;
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  left: 7px;
  width: 22px;
  height: 3px;
  content: "";
  background: var(--white);
  border-radius: 2px;
}

.brand-mark::before {
  top: 12px;
  transform: rotate(14deg);
}

.brand-mark::after {
  top: 21px;
  background: var(--gold);
  transform: rotate(-12deg);
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.2;
}

.brand strong {
  font-size: 15px;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.nav-links {
  display: flex;
  gap: 30px;
  align-items: center;
}

.nav-links a {
  position: relative;
  color: #334b59;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.nav-links a::after {
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--coral);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  color: var(--ink);
  background: transparent;
  border: 0;
  place-items: center;
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 590px;
  color: var(--white);
  background-color: var(--navy-deep);
  background-image: url("assets/signal-hero.jpg");
  background-position: center;
  background-size: cover;
}

.hero-inner {
  width: min(var(--content), calc(100% - 48px));
  margin: 0 auto;
  padding: 72px 0 88px;
}

.eyebrow,
.section-index {
  margin: 0 0 18px;
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.eyebrow {
  color: #9bd9d2;
}

.hero h1 {
  max-width: 820px;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 56px;
  font-weight: 700;
  line-height: 1.08;
}

.hero-copy {
  max-width: 720px;
  margin: 28px 0 0;
  color: #dce8ed;
  font-size: 19px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  padding: 11px 18px;
  gap: 9px;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 750;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 6px;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.button svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.button-primary {
  color: var(--navy-deep);
  background: var(--gold);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: #e1b747;
}

.button-secondary {
  color: var(--white);
  background: rgba(8, 38, 62, 0.52);
  border-color: rgba(255, 255, 255, 0.5);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  background: rgba(8, 38, 62, 0.88);
  border-color: var(--white);
}

.quick-facts {
  position: relative;
  z-index: 2;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  min-height: 112px;
}

.fact-grid > div {
  display: flex;
  padding: 24px 26px;
  flex-direction: column;
  justify-content: center;
  border-right: 1px solid var(--line);
}

.fact-grid > div:first-child {
  border-left: 1px solid var(--line);
}

.fact-grid span {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.fact-grid strong {
  font-size: 16px;
  line-height: 1.35;
}

.section {
  padding: 108px 0;
}

.section-tinted {
  background: var(--soft);
}

.section-index {
  color: var(--blue);
}

.section-heading h2,
.wide-heading h2,
.topics-intro h2,
.submission-grid h2,
.contact-inner h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 43px;
  line-height: 1.12;
}

.overview-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.35fr);
  gap: 96px;
  align-items: start;
}

.lead-prose p {
  margin: 0 0 24px;
  color: #344d5b;
  font-size: 20px;
  line-height: 1.8;
}

.lead-prose p:last-child {
  margin-bottom: 0;
}

.wide-heading {
  max-width: 780px;
}

.wide-heading > p:last-child,
.topics-intro > p:last-child {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.75;
}

.pillar-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 56px;
  background: var(--line);
  border: 1px solid var(--line);
}

.pillar {
  min-height: 260px;
  padding: 30px;
  background: var(--white);
}

.pillar span {
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  color: var(--white);
  background: var(--blue);
  font-size: 13px;
  font-weight: 800;
  border-radius: 4px;
}

.pillar:nth-child(2) span {
  background: var(--teal);
}

.pillar:nth-child(3) span {
  background: var(--coral);
}

.pillar:nth-child(4) span {
  color: var(--ink);
  background: var(--gold);
}

.pillar h3 {
  margin: 24px 0 10px;
  font-size: 20px;
  line-height: 1.3;
}

.pillar p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.topics-layout {
  display: grid;
  grid-template-columns: minmax(250px, 0.78fr) minmax(0, 1.45fr);
  gap: 96px;
}

.topics-intro {
  position: sticky;
  top: 106px;
  align-self: start;
}

.topic-list {
  padding: 0;
  margin: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.topic-list li {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 18px;
  align-items: center;
  min-height: 82px;
  border-bottom: 1px solid var(--line);
}

.topic-list span {
  display: inline-flex;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  color: var(--white);
  background: var(--blue);
  font-size: 13px;
  font-weight: 800;
  border-radius: 4px;
}

.topic-list li:nth-child(3n + 2) span {
  background: var(--teal);
}

.topic-list li:nth-child(3n) span {
  background: var(--coral);
}

.topic-list p {
  margin: 0;
  padding: 18px 0;
  color: #27404f;
  font-size: 17px;
  font-weight: 650;
  line-height: 1.45;
}

.submission-section {
  color: var(--white);
  background: var(--navy-deep);
}

.submission-section .section-index {
  color: #8fd4cb;
}

.submission-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.4fr);
  gap: 96px;
  align-items: start;
}

.notice {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 20px;
  padding: 30px;
  color: var(--ink);
  background: var(--white);
  border-top: 4px solid var(--gold);
  border-radius: 6px;
}

.notice-icon {
  display: grid;
  width: 48px;
  height: 48px;
  color: var(--white);
  background: var(--blue);
  border-radius: 4px;
  place-items: center;
}

.notice-icon svg {
  width: 23px;
  height: 23px;
}

.notice h3 {
  margin: 0;
  font-size: 20px;
  line-height: 1.35;
}

.notice p {
  margin: 12px 0 16px;
  color: var(--muted);
}

.text-link {
  display: inline-flex;
  gap: 7px;
  align-items: center;
  color: var(--blue);
  font-size: 14px;
  font-weight: 750;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.text-link svg {
  width: 16px;
  height: 16px;
}

.committee-block {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.4fr);
  gap: 96px;
  padding-top: 66px;
  margin-top: 66px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.committee-block h3 {
  margin: 0;
  color: #dce8ed;
  font-size: 17px;
  line-height: 1.5;
}

.committee-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 28px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.committee-list li {
  position: relative;
  padding-left: 18px;
  color: #c9d9df;
  font-size: 14px;
}

.committee-list li::before {
  position: absolute;
  top: 10px;
  left: 0;
  width: 6px;
  height: 6px;
  content: "";
  background: var(--gold);
}

.organizers-heading {
  margin-bottom: 54px;
}

.organizer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.organizer-card {
  display: grid;
  grid-template-columns: 1fr;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.organizer-content {
  display: flex;
  min-width: 0;
  padding: 32px 38px;
  flex-direction: column;
}

.role {
  margin: 0 0 4px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.organizer-content h3 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 27px;
  line-height: 1.2;
}

.affiliation {
  margin: 8px 0 0;
  color: var(--teal);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.45;
}

.bio {
  margin: 20px 0 22px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.organizer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-top: auto;
}

.organizer-links a {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  color: var(--navy);
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
}

.organizer-links a:hover,
.organizer-links a:focus-visible {
  color: var(--coral);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.organizer-links svg {
  width: 15px;
  height: 15px;
}

.contact-band {
  padding: 70px 0;
  color: var(--white);
  background: var(--blue);
  border-top: 8px solid var(--gold);
}

.contact-band .section-index {
  margin-bottom: 10px;
  color: #d4efeb;
}

.contact-inner {
  display: flex;
  gap: 40px;
  align-items: center;
  justify-content: space-between;
}

.contact-inner h2 {
  font-size: 36px;
}

.button-light {
  color: var(--navy-deep);
  background: var(--white);
}

.button-light:hover,
.button-light:focus-visible {
  background: #e7f1f4;
}

.site-footer {
  padding: 34px 0;
  color: #a9bbc5;
  background: #071e30;
}

.footer-inner {
  display: flex;
  gap: 24px;
  justify-content: space-between;
}

.footer-inner p {
  max-width: 650px;
  margin: 0;
  font-size: 12px;
}

@media (max-width: 1040px) {
  .hero h1 {
    max-width: 720px;
    font-size: 48px;
  }

  .pillar-grid {
    grid-template-columns: 1fr 1fr;
  }

  .organizer-grid {
    grid-template-columns: 1fr;
  }

}

@media (max-width: 820px) {
  .content-shell,
  .nav-shell,
  .hero-inner {
    width: min(100% - 36px, var(--content));
  }

  .nav-toggle {
    display: grid;
  }

  .nav-links {
    position: fixed;
    top: 70px;
    right: 0;
    left: 0;
    display: none;
    padding: 20px 18px 28px;
    flex-direction: column;
    gap: 0;
    align-items: stretch;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

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

  .nav-links a {
    min-height: 48px;
    padding: 12px 4px;
    border-bottom: 1px solid var(--line);
  }

  .nav-links a:last-child {
    border-bottom: 0;
  }

  .nav-links a::after {
    display: none;
  }

  .hero {
    min-height: 610px;
    background-position: 58% center;
  }

  .hero h1 {
    max-width: 650px;
    font-size: 43px;
  }

  .hero-copy {
    max-width: 610px;
    font-size: 17px;
  }

  .fact-grid {
    grid-template-columns: 1fr 1fr;
  }

  .fact-grid > div:first-child,
  .fact-grid > div {
    border-left: 0;
  }

  .fact-grid > div:nth-child(2n + 1) {
    border-left: 1px solid var(--line);
  }

  .fact-grid > div:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .section {
    padding: 82px 0;
  }

  .overview-grid,
  .topics-layout,
  .submission-grid,
  .committee-block {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .topics-intro {
    position: static;
  }

  .committee-list {
    grid-template-columns: 1fr 1fr;
  }

  .section-heading h2,
  .wide-heading h2,
  .topics-intro h2,
  .submission-grid h2 {
    font-size: 38px;
  }
}

@media (max-width: 600px) {
  .site-header {
    height: 64px;
  }

  .nav-links {
    top: 64px;
  }

  .hero {
    min-height: 580px;
    background-position: 45% center;
  }

  .hero-inner {
    padding: 48px 0 58px;
  }

  .hero h1 {
    font-size: 36px;
    line-height: 1.1;
  }

  .hero-copy {
    margin-top: 20px;
    font-size: 16px;
    line-height: 1.55;
  }

  .hero-actions {
    margin-top: 26px;
  }

  .button {
    width: 100%;
  }

  .fact-grid {
    grid-template-columns: 1fr;
  }

  .fact-grid > div,
  .fact-grid > div:first-child,
  .fact-grid > div:nth-child(2n + 1) {
    min-height: 84px;
    padding: 18px 4px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    border-left: 0;
  }

  .fact-grid > div:last-child {
    border-bottom: 0;
  }

  .section {
    padding: 68px 0;
  }

  .section-heading h2,
  .wide-heading h2,
  .topics-intro h2,
  .submission-grid h2,
  .contact-inner h2 {
    font-size: 33px;
  }

  .lead-prose p {
    font-size: 17px;
    line-height: 1.7;
  }

  .pillar-grid {
    grid-template-columns: 1fr;
  }

  .pillar {
    min-height: 0;
  }

  .topic-list li {
    grid-template-columns: 48px 1fr;
    gap: 10px;
  }

  .topic-list p {
    font-size: 15px;
  }

  .notice {
    grid-template-columns: 1fr;
    padding: 24px;
  }

  .committee-list {
    grid-template-columns: 1fr;
  }

  .organizer-card {
    grid-template-columns: 1fr;
  }

  .organizer-content {
    padding: 24px;
  }

  .organizer-content h3 {
    font-size: 25px;
  }

  .contact-inner,
  .footer-inner {
    flex-direction: column;
    align-items: stretch;
  }

  .footer-inner {
    gap: 10px;
  }
}

@media (max-width: 350px) {
  .hero h1 {
    font-size: 32px;
  }
}

@media (max-width: 350px) and (max-height: 650px) {
  .hero {
    min-height: calc(100svh - 100px);
  }

  .hero-inner {
    padding: 28px 0 34px;
  }

  .eyebrow {
    margin-bottom: 12px;
    font-size: 11px;
  }

  .hero-copy {
    margin-top: 14px;
    font-size: 14px;
    line-height: 1.45;
  }

  .hero-actions {
    margin-top: 18px;
  }

  .hero-actions .button-secondary {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}