:root {
  --navy-950: #111d4a;
  --navy-800: #364fa8;
  --navy-650: #6f87ee;
  --navy-500: #9cb4ff;
  --navy-rgb: 17, 29, 74;
  --white: #ffffff;
  --container: min(1160px, 92vw);
  --header-height: 76px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-soft: 0 12px 36px rgba(var(--navy-rgb), 0.24);
  --shadow-card: 0 24px 46px rgba(var(--navy-rgb), 0.2);
  --shadow-apple-square: 0 1px 1px rgba(var(--navy-rgb), 0.08), 0 12px 28px rgba(var(--navy-rgb), 0.16);
  --shadow-apple-square-hover: 0 2px 2px rgba(var(--navy-rgb), 0.1), 0 18px 36px rgba(var(--navy-rgb), 0.2);
  --shadow-apple-circle: 0 1px 1px rgba(var(--navy-rgb), 0.08), 0 10px 22px rgba(var(--navy-rgb), 0.16);
  --shadow-apple-circle-soft: 0 1px 1px rgba(var(--navy-rgb), 0.07), 0 7px 16px rgba(var(--navy-rgb), 0.14);
  --shadow-apple-circle-hover: 0 2px 2px rgba(var(--navy-rgb), 0.1), 0 14px 30px rgba(var(--navy-rgb), 0.2);
  --ease-out: 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Avenir Next", "Segoe UI", sans-serif;
  color: var(--navy-950);
  background: var(--white);
  line-height: 1.55;
  overflow-x: hidden;
}

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

:focus-visible {
  outline: 2px solid var(--navy-950);
  outline-offset: 2px;
}

.section-dark :focus-visible,
.site-header :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--white);
}

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

.container {
  width: var(--container);
  margin: 0 auto;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: -200px;
  z-index: 1200;
  background: var(--white);
  color: var(--navy-950);
  border: 2px solid var(--navy-950);
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
}

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

.site-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1100;
  height: var(--header-height);
  backdrop-filter: none;
  background: linear-gradient(180deg, rgba(var(--navy-rgb), 0.58) 0%, rgba(var(--navy-rgb), 0.34) 58%, rgba(var(--navy-rgb), 0) 100%);
  border-bottom: 0;
  transition: background var(--ease-out), border-color var(--ease-out), box-shadow var(--ease-out);
}

.site-header.nav-open {
  background: rgba(var(--navy-rgb), 0.82);
  border-bottom: 0;
  box-shadow: none;
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.brand {
  display: grid;
  gap: 0.1rem;
  color: var(--white);
}

.brand-mark {
  font-family: "Cormorant Garamond", "Baskerville", "Times New Roman", serif;
  font-size: clamp(1.6rem, 2.5vw, 2.2rem);
  line-height: 0.9;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.brand-subtitle {
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  opacity: 0.9;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.site-nav a {
  color: var(--white);
  opacity: 0.92;
  padding: 0.45rem 0.2rem;
  border-bottom: 1px solid transparent;
  font-size: 0.92rem;
  transition: opacity var(--ease-out), border-color var(--ease-out);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  opacity: 1;
  border-color: var(--white);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.78rem 1.28rem;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  transition: transform var(--ease-out), background var(--ease-out), color var(--ease-out), border-color var(--ease-out);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-solid {
  background: linear-gradient(145deg, #ffffff 0%, #eaf0ff 100%);
  color: var(--navy-950);
  border-color: var(--white);
  box-shadow: 0 14px 30px rgba(var(--navy-rgb), 0.28);
}

.button-solid:hover,
.button-solid:focus-visible {
  background: rgba(255, 255, 255, 0.9);
}

.button-outline {
  border-color: var(--white);
  color: var(--white);
  background: rgba(255, 255, 255, 0.18);
}

.button-outline:hover,
.button-outline:focus-visible {
  background: rgba(255, 255, 255, 0.28);
}

.register-inline {
  display: none;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  background: transparent;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}

.menu-toggle span {
  width: 16px;
  height: 2px;
  background: var(--white);
  border-radius: 999px;
}

.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(circle at 84% 18%, rgba(156, 180, 255, 0.28), transparent 42%),
    linear-gradient(146deg, rgba(17, 29, 74, 0.97) 0%, rgba(17, 29, 74, 0.9) 48%, rgba(54, 79, 168, 0.84) 100%);
}

.hero-media,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-media {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transform: scale(1);
  opacity: 0.92;
  filter: none;
  transition: transform 900ms ease, filter 900ms ease, opacity 900ms ease;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    repeating-linear-gradient(
      105deg,
      rgba(255, 255, 255, 0.03) 0,
      rgba(255, 255, 255, 0.03) 2px,
      transparent 2px,
      transparent 34px
    );
  mix-blend-mode: screen;
  opacity: 0.12;
  pointer-events: none;
}

.hero-overlay {
  background:
    radial-gradient(circle at 78% 24%, rgba(156, 180, 255, 0.24), transparent 46%),
    radial-gradient(circle at 16% 74%, rgba(111, 135, 238, 0.2), transparent 40%),
    linear-gradient(118deg, rgba(17, 29, 74, 0.5), rgba(17, 29, 74, 0.5));
}

.hero-content {
  position: relative;
  z-index: 1;
  color: var(--white);
  padding: clamp(7rem, 14vh, 10rem) 0 clamp(5rem, 9vh, 7rem);
  max-width: 760px;
}

.hero-content h1,
.hero-content .hero-tagline,
.hero-content .hero-description {
  text-shadow: 0 10px 32px rgba(var(--navy-rgb), 0.48);
}

.eyebrow {
  margin: 0 0 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.75rem;
  font-weight: 600;
  opacity: 0.84;
}

h1,
h2,
h3 {
  font-family: "Cormorant Garamond", "Baskerville", "Times New Roman", serif;
  margin: 0;
  line-height: 1.06;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.7rem);
  margin-bottom: 1rem;
  letter-spacing: 0.01em;
}

.hero-tagline {
  margin: 0;
  font-size: clamp(1rem, 2.2vw, 1.4rem);
  max-width: 54ch;
}

.hero-description {
  margin: 1rem 0 0;
  max-width: 62ch;
  opacity: 0.95;
}

.hero-actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.section {
  padding: clamp(4rem, 7vw, 6.6rem) 0;
}

.section-title {
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  margin-bottom: 1.8rem;
}

.section-light {
  background:
    radial-gradient(circle at 8% 0%, rgba(111, 135, 238, 0.16), transparent 36%),
    radial-gradient(circle at 94% 92%, rgba(156, 180, 255, 0.16), transparent 44%),
    linear-gradient(180deg, #ffffff 0%, #f2f6ff 100%);
  color: var(--navy-950);
}

.section-light-plain {
  background: #ffffff;
  color: var(--navy-950);
}

.section-light-soft {
  background:
    radial-gradient(circle at 10% 8%, rgba(156, 180, 255, 0.12), transparent 38%),
    linear-gradient(180deg, #fbfcff 0%, #f1f5ff 100%);
  color: var(--navy-950);
}

.section-dark {
  background:
    radial-gradient(circle at 16% 12%, rgba(111, 135, 238, 0.36), transparent 38%),
    radial-gradient(circle at 86% 88%, rgba(156, 180, 255, 0.3), transparent 42%),
    linear-gradient(160deg, var(--navy-950), #223782);
  color: var(--white);
}

.section-dark .eyebrow {
  opacity: 0.78;
}

.section-dark .section-title {
  color: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

.stat-card {
  border: 0;
  border-radius: 0;
  padding: 0;
  background: none;
  box-shadow: none;
  text-align: center;
}

.stat-value {
  margin: 0;
  font-family: "Cormorant Garamond", "Baskerville", "Times New Roman", serif;
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700;
  line-height: 1;
}

.stat-label {
  margin: 0.45rem 0 0;
  opacity: 0.86;
  font-size: 0.96rem;
}

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: clamp(1.2rem, 4vw, 3rem);
  align-items: center;
}

.about-image-wrap {
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-apple-square);
}

.about-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 360px;
}

.about-copy p {
  margin: 0;
  max-width: 62ch;
  opacity: 0.95;
}

.themes-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
}

.theme-card {
  position: relative;
  min-height: 240px;
  border-radius: var(--radius-md);
  overflow: hidden;
  isolation: isolate;
  border: 1px solid rgba(var(--navy-rgb), 0.14);
  box-shadow: var(--shadow-apple-square);
}

.theme-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.18) contrast(1.08) brightness(1.08);
}

.theme-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(175deg, rgba(var(--navy-rgb), 0.12), rgba(var(--navy-rgb), 0.58));
}

.theme-card-content {
  position: absolute;
  inset: auto 0 0;
  z-index: 1;
  padding: 1.2rem;
  color: var(--white);
}

.theme-card h3 {
  font-size: clamp(1.45rem, 2.4vw, 2rem);
  margin-bottom: 0.45rem;
}

.theme-card p {
  margin: 0;
  font-size: 0.92rem;
  opacity: 0.94;
}

.theme-card,
.speaker-card,
.agenda-item,
.faq-item,
.sponsor-logo-card {
  transition: transform var(--ease-out), box-shadow var(--ease-out);
}

.theme-card:hover,
.theme-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-apple-square-hover);
}

.speakers-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

.speaker-card {
  border: 0;
  border-radius: 0;
  overflow: visible;
  background: none;
  text-align: center;
  box-shadow: none;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.speaker-card img {
  width: clamp(140px, 18vw, 210px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 0;
  background: transparent;
  box-shadow: var(--shadow-apple-circle);
  object-fit: cover;
  transition: box-shadow var(--ease-out), transform var(--ease-out);
}

.speaker-copy {
  padding: 0.85rem 0 0;
  max-width: 28ch;
}

.speaker-name {
  margin: 0;
  font-size: 1.5rem;
}

.speaker-meta {
  margin: 0.4rem 0 0;
  font-size: 0.93rem;
  opacity: 0.9;
}

.team-subtitle {
  margin: 0 0 0.9rem;
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  text-align: center;
}

.team-tree {
  --team-line-color: rgba(var(--navy-rgb), 0.3);
  text-align: center;
}

.team-tree .eyebrow,
.team-tree .section-title {
  text-align: center;
}

.team-tree-level {
  position: relative;
  display: grid;
  justify-items: center;
}

.team-tree-level + .team-tree-level {
  margin-top: 2.5rem;
  padding-top: 0;
}

.team-tree-level + .team-tree-level::before {
  display: none;
}

.team-tree-level + .team-tree-level::after {
  display: none;
}

.cochairs-grid {
  display: flex;
  justify-content: center;
  gap: 2.2rem;
  width: min(760px, 100%);
  position: relative;
}

.directors-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1.2rem;
  width: min(1120px, 100%);
  position: relative;
  justify-items: center;
  align-items: start;
}

.team-person {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.team-photo {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  object-fit: cover;
  border: 0;
  background: transparent;
  box-shadow: var(--shadow-apple-circle);
  transition: box-shadow var(--ease-out), transform var(--ease-out);
}

.team-name {
  margin: 0;
  color: var(--navy-950);
  letter-spacing: 0.01em;
}

.team-role {
  margin: 0.26rem 0 0;
  color: rgba(var(--navy-rgb), 0.82);
}

.cochair-person {
  width: min(100%, 240px);
}

.team-photo-cochair {
  width: 172px;
  margin-bottom: 0.78rem;
}

.cochair-person .team-name {
  font-size: 1.3rem;
  line-height: 1.15;
}

.cochair-person .team-role {
  font-size: 0.94rem;
  line-height: 1.3;
}

.director-person {
  width: min(100%, 210px);
}

.team-photo-director {
  width: 112px;
  margin-bottom: 0.62rem;
}

.director-person .team-name {
  font-size: 1rem;
  line-height: 1.2;
}

.director-person .team-role {
  font-size: 0.8rem;
  line-height: 1.3;
  margin-bottom: 0.72rem;
}

.coordinator-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(66px, 1fr));
  gap: 0.72rem;
  width: 100%;
}

.coordinator-person {
  width: 100%;
  max-width: 72px;
  justify-self: center;
}

.team-photo-coordinator {
  width: 60px;
  margin-bottom: 0.32rem;
  box-shadow: var(--shadow-apple-circle-soft);
}

.coordinator-person .team-name {
  font-size: 0.68rem;
  line-height: 1.25;
}

.coordinator-person .team-role {
  font-size: 0.61rem;
  line-height: 1.25;
  margin-top: 0.08rem;
  opacity: 0.7;
}

.agenda-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.2rem;
}

.agenda-tab {
  border: 1px solid rgba(var(--navy-rgb), 0.22);
  border-radius: 999px;
  background: rgba(var(--navy-rgb), 0.02);
  color: var(--navy-950);
  padding: 0.55rem 1rem;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--ease-out), color var(--ease-out), border-color var(--ease-out);
}

.agenda-tab[aria-selected="true"] {
  background: var(--navy-950);
  color: var(--white);
  border-color: var(--navy-950);
}

.agenda-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(var(--navy-rgb), 0.16);
}

.agenda-item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 1rem;
  border: 0;
  border-bottom: 1px solid rgba(var(--navy-rgb), 0.16);
  border-radius: 0;
  padding: 1rem 0;
  background: none;
}

.agenda-item:hover {
  transform: none;
}

.agenda-time {
  font-weight: 700;
  letter-spacing: 0.03em;
}

.agenda-session {
  margin: 0;
  font-size: 1.25rem;
}

.agenda-details {
  margin: 0.28rem 0 0;
  opacity: 0.88;
  font-size: 0.92rem;
}

.sponsors-tree {
  --sponsor-line-color: rgba(255, 255, 255, 0.22);
}

.sponsors-tree .eyebrow,
.sponsors-tree .section-title {
  text-align: center;
}

.sponsor-tree-level {
  position: relative;
  display: grid;
  justify-items: center;
}

.sponsor-tree-level + .sponsor-tree-level {
  margin-top: 2.1rem;
  padding-top: 0;
}

.sponsor-tree-level + .sponsor-tree-level::before {
  display: none;
}

.sponsor-tree-level + .sponsor-tree-level::after {
  display: none;
}

.sponsor-tree-level h3 {
  margin: 0 0 0.9rem;
  font-size: 1.38rem;
  text-align: center;
}

.sponsor-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.1rem;
  width: min(980px, 100%);
  position: relative;
}

.sponsor-grid.tier-title {
  width: min(250px, 100%);
}

.sponsor-grid.tier-gold {
  width: min(640px, 100%);
}

.sponsor-grid.tier-community {
  width: min(980px, 100%);
}

.sponsor-logo-card {
  width: 126px;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  padding: 0.88rem;
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: none;
  box-shadow: var(--shadow-apple-circle);
  position: relative;
}

.sponsor-tree-level:not(.sponsor-level-title) .sponsor-logo-card::before {
  display: none;
}

.sponsor-logo-card:hover {
  transform: translateY(-1px) scale(1.02);
  box-shadow: var(--shadow-apple-circle-hover);
}

.sponsor-logo-card img {
  width: 76%;
  max-width: 92px;
  max-height: 64px;
  object-fit: contain;
}

.sponsor-tier-title {
  width: 154px;
}

.sponsor-tier-gold {
  width: 132px;
}

.sponsor-tier-community {
  width: 118px;
}

#sponsors .sponsor-logo-card {
  background: rgba(var(--navy-rgb), 0.06);
}

#sponsors .button-solid {
  background: var(--navy-950);
  color: var(--white);
  border-color: var(--navy-950);
}

#sponsors .button-solid:hover,
#sponsors .button-solid:focus-visible {
  background: var(--navy-800);
  border-color: var(--navy-800);
}

#sponsors .button-outline {
  border-color: rgba(var(--navy-rgb), 0.38);
  color: var(--navy-950);
  background: rgba(var(--navy-rgb), 0.04);
}

#sponsors .button-outline:hover,
#sponsors .button-outline:focus-visible {
  background: rgba(var(--navy-rgb), 0.1);
}

.sponsor-callout {
  margin: 1.9rem auto 0;
  max-width: min(780px, 100%);
  border-radius: 0;
  padding: 0;
  background: none;
  border: 0;
  display: grid;
  justify-items: center;
  text-align: center;
  gap: 0.6rem;
}

.sponsor-callout h3 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.5rem);
}

.sponsor-callout p {
  margin: 0 auto;
  max-width: 62ch;
}

.sponsor-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.85rem;
  width: 100%;
}

.sponsor-actions .button {
  width: auto;
}

.venue-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 1.2rem;
  align-items: stretch;
}

.venue-copy p {
  margin: 0 0 0.6rem;
}

.venue-map {
  border: 1px solid rgba(var(--navy-rgb), 0.2);
  border-radius: var(--radius-md);
  overflow: hidden;
  min-height: 320px;
  box-shadow: var(--shadow-apple-square);
}

.venue-map iframe,
.venue-map img {
  width: 100%;
  height: 100%;
  border: 0;
  object-fit: cover;
}

.faq-list {
  display: grid;
  gap: 0;
}

.faq-item {
  border-radius: 0;
  border: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  overflow: visible;
  background: none;
}

.faq-item:first-child {
  border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.faq-item:hover {
  transform: none;
}

.faq-question {
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  color: var(--white);
  font: inherit;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 1rem 0;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.faq-question::after {
  content: "+";
  line-height: 1;
  font-size: 1.3rem;
}

.faq-question[aria-expanded="true"]::after {
  content: "-";
}

.faq-answer {
  margin: 0;
  padding: 0 0 1rem;
  color: rgba(255, 255, 255, 0.9);
}

.site-footer {
  padding: 3rem 0 1.3rem;
  background: var(--navy-950);
  color: var(--white);
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1.4rem;
}

.footer-eyebrow {
  margin-bottom: 0.5rem;
}

.footer-brand {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  margin-bottom: 0.8rem;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.social-links a {
  border: 1px solid rgba(255, 255, 255, 0.46);
  border-radius: 999px;
  padding: 0.42rem 0.85rem;
  font-size: 0.88rem;
  transition: background var(--ease-out), color var(--ease-out);
}

.social-links a:hover,
.social-links a:focus-visible {
  background: var(--white);
  color: var(--navy-950);
}

.footer-bottom {
  margin-top: 1.4rem;
  padding-top: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 0.9rem;
  opacity: 0.82;
}

.observe {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 620ms ease, transform 620ms ease;
}

.observe.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1180px) {
  .site-nav {
    gap: 0.75rem;
  }

  .site-nav a {
    font-size: 0.86rem;
  }

  .sponsor-grid.tier-community {
    width: min(760px, 100%);
  }
}

@media (max-width: 1024px) {
  section[id] {
    scroll-margin-top: calc(var(--header-height) + 14px);
  }

  .site-header {
    position: fixed;
    background: rgba(var(--navy-rgb), 0.94);
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
    backdrop-filter: blur(10px) saturate(115%);
  }

  .site-header.nav-open {
    box-shadow: 0 14px 30px rgba(var(--navy-rgb), 0.3);
  }

  .register-desktop {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    right: 0;
    left: 0;
    width: 100%;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    padding: 0.9rem 1rem 1.1rem;
    background: rgba(var(--navy-rgb), 0.98);
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
    flex-direction: column;
    align-items: flex-start;
    transform: translateX(100%);
    transition: transform var(--ease-out);
  }

  .site-header.nav-open .site-nav {
    transform: translateX(0);
  }

  .site-nav a {
    width: 100%;
    padding: 0.74rem 0;
    font-size: 0.98rem;
  }

  .register-inline {
    display: inline-flex;
    margin-top: 0.4rem;
  }

  .about-layout,
  .venue-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .themes-grid,
  .speakers-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section-title {
    line-height: 1.12;
  }

  .hero {
    min-height: 100svh;
  }

  .hero-content {
    max-width: 100%;
    padding-top: clamp(6.2rem, 13vh, 8rem);
    padding-bottom: clamp(3.2rem, 8vh, 4.8rem);
  }

  .hero-description {
    max-width: 52ch;
  }

  .team-tree-level + .team-tree-level::before,
  .team-tree-level + .team-tree-level::after,
  .sponsor-tree-level + .sponsor-tree-level::before,
  .sponsor-tree-level + .sponsor-tree-level::after,
  .sponsor-tree-level:not(.sponsor-level-title) .sponsor-logo-card::before {
    display: none;
  }

  .cochairs-grid {
    gap: 1.4rem;
  }

  .team-photo-cochair {
    width: 154px;
  }

  .directors-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: min(860px, 100%);
    gap: 1.4rem 1rem;
  }

  .director-person {
    max-width: 190px;
  }

  .team-photo-director {
    width: 102px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    gap: 0.7rem;
  }

  .brand-mark {
    font-size: clamp(1.45rem, 7vw, 1.95rem);
  }

  .brand-subtitle {
    display: none;
  }

  .section {
    padding: 3.2rem 0;
  }

  .hero-content {
    padding-top: 6rem;
    padding-bottom: 4rem;
  }

  .stats-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.75rem;
  }

  .stat-value {
    font-size: clamp(2rem, 7vw, 2.8rem);
  }

  .stat-label {
    font-size: 0.78rem;
    line-height: 1.25;
  }

  .themes-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.7rem;
  }

  .theme-card {
    min-height: 200px;
  }

  .theme-card-content {
    padding: 0.82rem;
  }

  .theme-card h3 {
    font-size: clamp(1.08rem, 4.4vw, 1.35rem);
    margin-bottom: 0.3rem;
  }

  .theme-card p {
    font-size: 0.8rem;
  }

  .speakers-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.5rem;
  }

  .speaker-card img {
    width: clamp(70px, 20vw, 96px);
  }

  .speaker-copy {
    padding-top: 0.55rem;
    max-width: 100%;
  }

  .speaker-name {
    font-size: 1rem;
    line-height: 1.2;
  }

  .speaker-meta {
    margin-top: 0.2rem;
    font-size: 0.72rem;
    line-height: 1.25;
  }

  .team-tree-level + .team-tree-level::before,
  .team-tree-level + .team-tree-level::after,
  .sponsor-tree-level + .sponsor-tree-level::before,
  .sponsor-tree-level + .sponsor-tree-level::after,
  .sponsor-tree-level:not(.sponsor-level-title) .sponsor-logo-card::before {
    display: none;
  }

  .cochairs-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: min(420px, 100%);
    gap: 0.9rem;
  }

  .team-photo-cochair {
    width: 118px;
  }

  .sponsor-grid {
    width: 100%;
    gap: 0.9rem;
  }

  .sponsor-tier-title {
    width: 138px;
  }

  .sponsor-tier-gold {
    width: 124px;
  }

  .sponsor-tier-community {
    width: 108px;
  }

  .directors-grid {
    width: min(560px, 100%);
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.2rem 0.85rem;
  }

  .director-person {
    max-width: 180px;
  }

  .team-photo-director {
    width: 92px;
  }

  .coordinator-row {
    grid-template-columns: repeat(auto-fit, minmax(58px, 1fr));
    gap: 0.56rem;
  }

  .coordinator-person {
    max-width: 66px;
  }

  .team-photo-coordinator {
    width: 52px;
  }

  .agenda-item {
    grid-template-columns: 1fr;
  }

  .agenda-time {
    font-size: 0.93rem;
  }

  .hero-actions {
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 0.6rem;
    width: min(420px, 100%);
  }

  .sponsor-actions {
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .hero-actions .button {
    flex: 1 1 0;
    width: auto;
    min-width: 0;
    padding-inline: 0.5rem;
    white-space: nowrap;
  }

  .sponsor-actions .button {
    width: 100%;
  }

  .sponsor-actions .button {
    width: min(100%, 320px);
  }

  .faq-question {
    font-size: 1rem;
  }

  .faq-answer {
    font-size: 0.95rem;
  }
}

@media (max-width: 560px) {
  .site-nav {
    padding-inline: 0.9rem;
  }

  .cochairs-grid {
    width: min(320px, 100%);
    gap: 0.75rem;
  }

  .team-photo-cochair {
    width: 104px;
  }

  .directors-grid {
    grid-template-columns: 1fr;
    width: min(240px, 100%);
  }

  .team-photo-director {
    width: 84px;
  }

  .sponsor-tier-title {
    width: 126px;
  }

  .sponsor-tier-gold {
    width: 112px;
  }

  .sponsor-tier-community {
    width: 96px;
  }

  .hero-actions {
    width: 100%;
  }

  .hero-actions .button {
    font-size: 0.88rem;
  }
}

@media (max-width: 420px) {
  .hero {
    min-height: calc(88vh - var(--header-height));
  }

  .section-title {
    font-size: clamp(1.7rem, 8vw, 2.3rem);
  }
}