:root {
  --navy: #102847;
  --navy-deep: #09182d;
  --ink: #16263a;
  --muted: #56677d;
  --burgundy: #982744;
  --burgundy-dark: #731c36;
  --sakura: #d86c91;
  --gold: #dca63e;
  --sky: #eaf1f8;
  --mist: #f5f7fa;
  --white: #ffffff;
  --border: #dce4ee;
  --shadow: 0 18px 42px rgba(12, 28, 50, 0.08);
  --heading: "Raleway", Arial, sans-serif;
  --body: "Roboto", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--body);
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
}

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

a {
  color: var(--burgundy);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.17em;
}

a:hover {
  color: var(--burgundy-dark);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--navy);
  font-family: var(--heading);
  font-weight: 800;
  letter-spacing: 0;
  line-height: 1.16;
}

p {
  margin: 0;
}

.container {
  width: min(1180px, calc(100% - 2.5rem));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 2000;
  padding: 0.75rem 1rem;
  color: var(--white);
  background: var(--burgundy);
}

.skip-link:focus {
  top: 0.75rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: 76px;
  background-color: rgba(9, 24, 45, 0.97);
  background-image: url('../img/sakura-header-bg.svg');
  background-size: 100% 76px;
  background-position: center top;
  background-repeat: no-repeat;
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(216, 108, 145, 0.18);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.7rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.72rem;
  margin-right: auto;
  color: var(--white);
  text-decoration: none;
}

.brand-logo {
  width: 46px;
  height: 46px;
  padding: 5px;
  border-radius: 8px;
  object-fit: contain;
  background: #ffffff;
  flex-shrink: 0;
}

.brand-text strong {
  display: block;
  color: var(--white);
  font-family: var(--heading);
  font-size: 1.25rem;
  line-height: 1.1;
}

.brand-text span {
  display: block;
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.76rem;
  letter-spacing: 0.01em;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  flex: 1;
}

.nav a {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.42rem 0.85rem;
  border-radius: 6px;
  white-space: nowrap;
  transition: color 0.2s, background 0.2s;
}

.nav a:hover {
  color: var(--white);
  background: rgba(216, 108, 145, 0.18);
}

.nav a[aria-current="page"] {
  color: var(--white);
  background: rgba(152, 39, 68, 0.48);
  border-bottom: 2px solid var(--sakura);
  padding-bottom: calc(0.38rem - 2px);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 6px;
  color: var(--white);
  background: transparent;
  font-size: 1.45rem;
}

.event-tag {
  display: inline-flex;
  margin-bottom: 1.3rem;
  padding: 0.48rem 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 4px;
  color: #f8d98a;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 48px;
  padding: 0.72rem 1.12rem;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 700;
  text-decoration: none;
}

.button-primary {
  color: var(--white);
  background: var(--burgundy);
}

.button-primary:hover {
  color: var(--white);
  background: var(--burgundy-dark);
}

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

.button-light:hover {
  color: var(--navy);
  background: #eff3f7;
}

.button-outline {
  color: var(--navy);
  border-color: #bdcad9;
  background: transparent;
}

.button-outline:hover {
  color: var(--navy);
  background: var(--sky);
}

.button-disabled {
  color: var(--muted);
  border-color: var(--border);
  background: var(--mist);
  cursor: not-allowed;
}

.hero {
  position: relative;
  display: flex;
  min-height: min(690px, calc(100svh - 124px));
  color: var(--white);
  overflow: hidden;
  background: var(--navy-deep);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 78% 92% at 10% 28%, rgba(6, 17, 33, 0.94) 0%, rgba(8, 21, 42, 0.86) 36%, rgba(8, 21, 42, 0.54) 58%, rgba(8, 21, 42, 0.15) 80%, rgba(8, 21, 42, 0.03) 100%),
    linear-gradient(100deg, rgba(6, 17, 33, 0.13) 4%, rgba(9, 24, 45, 0.08) 50%, rgba(122, 27, 52, 0.03) 100%);
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(1.1) contrast(1.03);
}

.hero-content {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: start;
  padding: clamp(2.7rem, 5.5vh, 3.8rem) 0 clamp(2.4rem, 5vh, 3.2rem);
}

.hero-content > div {
  min-width: 0;
  width: min(760px, 100%);
}

.hero-eyebrow {
  margin: 0 0 0.6rem;
  color: rgba(255, 255, 255, 0.58);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 680px;
  color: var(--white);
  font-size: clamp(2.55rem, 4.75vw, 4.15rem);
  line-height: 1.08;
}

/* ── Highlighted initials H M D S ── */
.hi {
  color: var(--sakura);
  animation: hi-pulse 6.5s ease-in-out infinite;
  animation-delay: var(--d, 0s);
  display: inline;
}

@keyframes hi-pulse {
  0%, 100% {
    color: var(--sakura);
    text-shadow: 0 0 14px rgba(216, 108, 145, 0.5);
  }
  50% {
    color: #4db8d4;
    text-shadow: 0 0 20px rgba(0, 153, 190, 0.5);
  }
}

/* ── HMDS 2027 badge ── */
.hero-abbr {
  margin: 1rem 0 0;
  font-family: var(--heading);
  font-weight: 800;
  letter-spacing: 0.18em;
  line-height: 1;
  font-size: clamp(2rem, 3.8vw, 3.2rem);
}

.hero-abbr-letters {
  background: linear-gradient(120deg,
    var(--sakura) 0%,
    #4db8d4 38%,
    var(--burgundy) 68%,
    var(--sakura) 100%);
  background-size: 250% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: abbr-shimmer 14s linear infinite;
}

.hero-abbr-year {
  -webkit-text-fill-color: rgba(255, 255, 255, 0.68);
  color: rgba(255, 255, 255, 0.68);
  font-size: 0.72em;
  letter-spacing: 0.1em;
}

@keyframes abbr-shimmer {
  0%   { background-position: 250% center; }
  100% { background-position: -250% center; }
}

/* ── Sakura petal particles ── */
.sakura-petal {
  position: absolute;
  top: 0;
  pointer-events: none;
  border-radius: 150% 0 150% 0;
  will-change: transform, opacity;
  animation: petal-fall var(--fall-dur, 34s) var(--fall-del, 0s) linear infinite;
}

@keyframes petal-fall {
  0% {
    transform: translateY(-30px) translateX(0px) rotate(0deg);
    opacity: 0;
  }
  6%  { opacity: var(--petal-op, 0.5); }
  90% { opacity: var(--petal-op, 0.5); }
  100% {
    transform: translateY(110vh) translateX(var(--drift, 40px)) rotate(var(--spin, 360deg));
    opacity: 0;
  }
}

.hero-lead {
  max-width: 570px;
  margin: 1.2rem 0 1.5rem;
  color: rgba(255, 255, 255, 0.89);
  font-size: clamp(1rem, 1.4vw, 1.1rem);
}

.event-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.45rem;
  margin-bottom: 1.7rem;
  color: var(--white);
  font-weight: 700;
}

.hero-brand-strip {
  margin-top: 1.6rem;
  width: min(760px, 100%);
}

.hero-brand-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
}

.hero-brand-logos img {
  width: auto;
  max-width: 210px;
  height: 48px;
  padding: 0.2rem 0.36rem;
  border-radius: 999px;
  object-fit: contain;
  background:
    radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.06) 64%, transparent 78%);
  box-shadow: 0 8px 22px rgba(2, 11, 24, 0.08);
  backdrop-filter: blur(10px);
  filter: none;
}

.hero-brand-logos .hero-logo-mark {
  height: 70px;
  max-width: 103px;
  padding: 0.14rem;
}

.hero-brand-logos .hero-logo-wide {
  max-width: 216px;
}

.event-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-width: 0;
  overflow-wrap: anywhere;
}

.section {
  padding: clamp(3.25rem, 6vw, 5.2rem) 0;
}

.section[id] {
  scroll-margin-top: 90px;
}

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

.page-shell {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}

.page-flow {
  min-width: 0;
}

.page-flow > .section {
  padding-block: clamp(3rem, 5.6vw, 4.8rem);
}

.page-flow > .section:first-child {
  padding-top: clamp(2.5rem, 4.8vw, 3.8rem);
}

.page-flow > .section > .container {
  width: 100%;
}

.page-flow > .section-alt {
  margin-inline: -1.25rem;
  padding-inline: 1.25rem;
  border-radius: 7px;
}

.side-toc {
  position: sticky;
  top: calc(76px + 1.25rem);
  margin-top: clamp(2.5rem, 4.8vw, 3.8rem);
  padding: 0.2rem 1rem 0.35rem 0;
  border-right: 1px solid var(--border);
}

.side-toc p {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.side-toc .anchor-links {
  display: grid;
  gap: 0.25rem;
  padding: 0;
}

.side-toc .anchor-links a {
  display: flex;
  align-items: center;
  min-height: 38px;
  padding: 0.45rem 0.65rem;
  border-left: 3px solid transparent;
  border-radius: 0 5px 5px 0;
  color: var(--navy);
  background: transparent;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.side-toc .anchor-links a:hover,
.side-toc .anchor-links a:focus-visible {
  color: var(--burgundy-dark);
  background: var(--mist);
}

.side-toc .anchor-links a.is-active,
.side-toc .anchor-links a[aria-current="location"] {
  border-left-color: var(--burgundy);
  color: var(--burgundy-dark);
  background: #f9edf1;
}

.home-dates {
  padding-block: clamp(2.5rem, 4.8vw, 3.8rem);
}

.home-dates,
.home-welcome,
.home-partners {
  background:
    linear-gradient(90deg, rgba(216, 108, 145, 0.035), transparent 34%),
    var(--white);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.kicker {
  display: inline-block;
  margin-bottom: 0.55rem;
  color: var(--burgundy);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
}

.section-head h2 {
  font-size: clamp(1.75rem, 3vw, 2.45rem);
}

.section-head p {
  max-width: 620px;
  margin-top: 0.7rem;
  color: var(--muted);
}

.text-link {
  flex-shrink: 0;
  color: var(--burgundy);
  font-weight: 700;
}

.deadlines-summary {
  display: grid;
  grid-template-columns: minmax(245px, 0.8fr) minmax(550px, 1.2fr);
  gap: clamp(2.2rem, 5vw, 4.5rem);
  align-items: start;
}

.deadlines-intro h2 {
  margin-bottom: 0.55rem;
  font-size: clamp(1.75rem, 3vw, 2.45rem);
}

.deadlines-intro p {
  margin-bottom: 0.8rem;
  color: var(--muted);
}

.deadline-milestones {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  border-top: 2px solid var(--navy);
  border-bottom: 1px solid var(--border);
}

.deadline-milestones div {
  padding: 1.05rem 1.1rem 1.2rem 0;
}

.deadline-milestones div + div {
  padding-left: 1.1rem;
  border-left: 1px solid var(--border);
}

.deadline-milestones dt {
  margin-bottom: 0.6rem;
  color: var(--muted);
  font-size: 0.73rem;
  font-weight: 800;
  text-transform: uppercase;
}

.deadline-milestones dd {
  margin: 0;
  color: var(--burgundy);
  font-family: var(--heading);
  font-size: 1.03rem;
  font-weight: 800;
}

.deadline-milestones .symposium-date dd {
  color: var(--navy);
}

.notice {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.welcome-card {
  display: grid;
  grid-template-columns: 212px minmax(0, 720px);
  justify-content: center;
  align-items: center;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.welcome-card img {
  width: 212px;
  height: 212px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 20%;
  border: 5px solid var(--white);
  box-shadow: var(--shadow);
}

.welcome-card h2 {
  margin-bottom: 0.8rem;
  font-size: clamp(1.6rem, 2.7vw, 2.15rem);
}

.welcome-card blockquote {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.welcome-signature {
  display: grid;
  margin-bottom: 0.72rem;
}

.welcome-signature strong {
  color: var(--navy);
  font-family: var(--heading);
}

.welcome-signature span {
  color: var(--muted);
  font-size: 0.92rem;
}

.scope-statement {
  max-width: 1000px;
}

.scope-statement h2 {
  margin-bottom: 1rem;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.scope-statement > p {
  max-width: 920px;
  margin-bottom: 0.85rem;
  color: var(--muted);
}

.scope-statement .scope-lead {
  color: var(--ink);
  font-size: clamp(1.04rem, 1.55vw, 1.15rem);
  line-height: 1.7;
}

.scope-themes {
  margin: 2rem 0 1.2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--border);
}

.scope-themes h3 {
  margin-bottom: 0.8rem;
  font-size: 1.12rem;
}

.scope-themes ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.scope-themes li {
  position: relative;
  padding: 0.62rem 0.25rem 0.62rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}

.scope-themes li::before {
  content: "";
  position: absolute;
  top: 1.15rem;
  left: 0;
  width: 5px;
  height: 5px;
  background: var(--burgundy);
}

.scope-link {
  display: inline-flex;
}

.home-publication {
  background:
    linear-gradient(90deg, rgba(152, 39, 68, 0.05), transparent 42%),
    var(--white);
}

.publication-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: center;
  padding: clamp(1.3rem, 3vw, 1.9rem);
  border-top: 2px solid var(--navy);
  border-bottom: 1px solid var(--border);
  background: var(--white);
}

.publication-panel h2 {
  margin-bottom: 0.62rem;
  font-size: clamp(1.65rem, 2.7vw, 2.2rem);
}

.publication-panel p {
  max-width: 780px;
  color: var(--muted);
}

.content-card {
  padding: 1.45rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--white);
}

.venue-summary {
  display: grid;
  grid-template-columns: 0.94fr 1.06fr;
  gap: clamp(1.5rem, 4vw, 3.25rem);
  align-items: center;
}

.venue-summary img {
  width: 100%;
  height: min(390px, 34vw);
  border: 1px solid rgba(16, 40, 71, 0.08);
  border-radius: 7px;
  object-fit: cover;
  object-position: center 46%;
  box-shadow: var(--shadow);
}

.venue-copy {
  color: var(--muted);
}

.venue-copy h2 {
  margin-bottom: 0.85rem;
}

.venue-copy p {
  margin-bottom: 1.35rem;
}

.partner-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: center;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.partner {
  display: grid;
  place-items: center;
  min-height: 76px;
  padding: 0.7rem 1rem;
  border: 1px solid rgba(16, 40, 71, 0.06);
  border-radius: 7px;
  background: var(--white);
}

.partner img {
  max-height: 70px;
  width: auto;
}

.partner.wide img {
  max-height: 48px;
}

.page-hero {
  padding: clamp(1.8rem, 3.5vw, 2.6rem) 0;
  color: var(--white);
  background: var(--navy-deep);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.page-hero h1 {
  max-width: 820px;
  margin-bottom: 0.55rem;
  color: var(--white);
  font-size: clamp(1.7rem, 3.2vw, 2.35rem);
}

.page-hero p {
  max-width: 680px;
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.97rem;
}

.anchor-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  padding: 0.85rem 0;
}

.anchor-links a {
  display: inline-flex;
  align-items: center;
  padding: 0.38rem 0.7rem;
  border-radius: 4px;
  color: var(--navy);
  background: var(--sky);
  font-weight: 700;
  font-size: 0.88rem;
  text-decoration: none;
  transition: background 200ms ease, color 200ms ease, transform 200ms ease;
}

.anchor-links a:hover,
.anchor-links a:focus-visible {
  color: var(--burgundy-dark);
  background: rgba(255, 231, 210, 0.65);
  transform: translateY(-1px);
}

.anchor-links a.is-active,
.anchor-links a[aria-current="location"] {
  color: var(--white);
  background: var(--burgundy);
}

.topic-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.topic-column {
  padding: 1.3rem;
  border: 1px solid var(--border);
  border-radius: 7px;
}

.topic-column h3 {
  margin-bottom: 0.85rem;
  font-size: 1.06rem;
}

.topic-column ul,
.plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.topic-column li,
.plain-list li {
  position: relative;
  padding: 0.35rem 0 0.35rem 1rem;
  color: var(--muted);
}

.topic-column li::before,
.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.87rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--burgundy);
}

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

.content-gap-top {
  margin-top: 1rem;
}

.content-card h3 {
  margin-bottom: 0.65rem;
  font-size: 1.14rem;
}

.content-card p {
  margin-bottom: 0.7rem;
  color: var(--muted);
}

.content-card p:last-child {
  margin-bottom: 0;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 7px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
}

.data-table th {
  padding: 0.9rem 1rem;
  color: var(--white);
  background: var(--navy);
  text-align: left;
  font-family: var(--heading);
}

.data-table td {
  padding: 0.82rem 1rem;
  border-bottom: 1px solid var(--border);
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.data-table td:last-child {
  color: var(--burgundy);
  font-weight: 700;
}

.speaker-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.05rem;
}

.speaker-card {
  overflow: hidden;
  padding: 1.1rem 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  background:
    linear-gradient(180deg, rgba(234, 241, 248, 0.78), rgba(255, 255, 255, 0) 46%),
    var(--white);
  text-align: center;
}

.speaker-photo {
  width: 156px;
  height: 156px;
  margin: 0.2rem auto 1rem;
  border: 5px solid var(--white);
  border-radius: 50%;
  object-fit: cover;
  object-position: center center;
  background: var(--sky);
  box-shadow: 0 14px 30px rgba(16, 40, 71, 0.13);
}

.speaker-photo-bruno {
  object-position: center 42%;
}

.speaker-photo-isaac {
  object-position: center center;
}

.speaker-photo-david {
  object-position: center 30%;
}

.speaker-body {
  padding: 0 0.15rem;
}

.speaker-body h3 {
  margin-bottom: 0.45rem;
  font-size: 1.08rem;
}

.speaker-body p {
  margin-bottom: 0.6rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.speaker-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.25rem;
  color: var(--burgundy);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

.speaker-link:hover {
  color: var(--burgundy-dark);
  text-decoration: underline;
}

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

.tutorial-card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  background:
    linear-gradient(90deg, rgba(152, 39, 68, 0.06), transparent 52%),
    var(--white);
}

.tutorial-card span {
  display: inline-block;
  margin-bottom: 0.55rem;
  color: var(--burgundy);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.tutorial-card h3 {
  margin-bottom: 0.45rem;
  font-size: 1.14rem;
}

.tutorial-card p {
  color: var(--muted);
}

.program-tabs {
  display: grid;
  gap: 1rem;
}

.program-tab-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.program-tab {
  display: grid;
  gap: 0.12rem;
  min-height: 72px;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--white);
  color: var(--navy);
  font-family: var(--body);
  text-align: left;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, color 180ms ease;
}

.program-tab span {
  color: var(--burgundy);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
}

.program-tab strong {
  font-family: var(--heading);
  font-size: 1.02rem;
  font-weight: 800;
}

.program-tab:hover,
.program-tab:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(152, 39, 68, 0.42);
}

.program-tab.is-active {
  border-color: var(--burgundy);
  color: var(--white);
  background: var(--burgundy);
}

.program-tab.is-active span,
.program-tab.is-active strong {
  color: var(--white);
}

.program-panel {
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--white);
  overflow: hidden;
}

.program-panel-head {
  padding: 1.25rem 1.35rem;
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(90deg, rgba(152, 39, 68, 0.08), transparent 44%),
    var(--white);
}

.program-panel-head h3 {
  margin-bottom: 0.5rem;
  font-size: clamp(1.3rem, 2.2vw, 1.75rem);
}

.program-panel-head p {
  max-width: 760px;
  color: var(--muted);
}

.agenda {
  display: grid;
  gap: 0;
  padding: 0.35rem 1.35rem 1rem;
}

.agenda-row {
  display: grid;
  grid-template-columns: 136px minmax(0, 1fr);
  gap: 1.15rem;
  align-items: start;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
}

.agenda-row:last-child {
  border-bottom: 0;
}

.agenda time {
  padding-top: 0.16rem;
  color: var(--burgundy);
  font-weight: 700;
}

.agenda-body {
  position: relative;
  padding-left: 0.85rem;
  color: var(--muted);
}

.agenda-body::before {
  content: "";
  position: absolute;
  top: 0.52rem;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--burgundy);
}

.agenda-body strong {
  display: block;
  margin-bottom: 0.12rem;
  color: var(--navy);
}

.chair {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 1.5rem;
  align-items: center;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 7px;
}

.chair img {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 20%;
}

.committee-list {
  columns: 2;
  column-gap: 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.committee-list li {
  break-inside: avoid;
  padding: 0 0 0.82rem;
  color: var(--muted);
}

.committee-list strong {
  display: block;
  color: var(--navy);
}

.committee-list-single {
  columns: 1;
}

.role-label {
  display: inline-flex;
  margin-bottom: 0.55rem;
  padding: 0.2rem 0.48rem;
  border-radius: 4px;
  color: var(--burgundy);
  background: #f9edf1;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
}

.committee-group {
  padding: 1.4rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--white);
}

.committee-group h2 {
  margin-bottom: 1.15rem;
  font-size: 1.35rem;
}

.travel-visual {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--white);
}

.travel-visual img {
  width: 100%;
  min-height: 310px;
  height: 100%;
  object-fit: cover;
}

.travel-copy {
  padding: clamp(1.25rem, 3vw, 2rem);
}

.travel-copy h3 {
  margin-bottom: 0.75rem;
}

.travel-copy p {
  margin-bottom: 1.2rem;
  color: var(--muted);
}

.travel-gallery-section {
  padding-top: clamp(2.6rem, 5vw, 4.3rem);
}

.tokyo-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 172px;
  gap: 0.7rem;
}

.tokyo-gallery figure {
  position: relative;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border-radius: 7px;
  background: var(--sky);
}

.tokyo-gallery .gallery-tall {
  grid-row: span 2;
}

.tokyo-gallery a {
  display: block;
  width: 100%;
  height: 100%;
  color: var(--white);
  text-decoration: none;
}

.tokyo-gallery a:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: -3px;
}

.tokyo-gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 280ms ease;
}

.tokyo-gallery figure:hover img {
  transform: scale(1.035);
}

.tokyo-gallery figcaption {
  position: absolute;
  inset: auto 0 0;
  padding: 1.7rem 0.72rem 0.55rem;
  color: var(--white);
  background: linear-gradient(transparent, rgba(9, 24, 45, 0.8));
  font-size: 0.86rem;
  font-weight: 700;
}

.hotel-grid,
.stay-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.hotel,
.stay-card {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--white);
}

.hotel img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.hotel-body {
  padding: 1rem;
}

.hotel-body h3 {
  margin-bottom: 0.42rem;
  font-size: 1.05rem;
}

.hotel-body p {
  color: var(--muted);
  font-size: 0.9rem;
}

.stay-card {
  padding: 0;
}

.stay-card-img {
  width: 100%;
  height: 165px;
  object-fit: cover;
  display: block;
}

.stay-card-body {
  padding: 1.05rem 1.18rem 1.18rem;
}

.stay-card h3 {
  margin: 0.35rem 0 0.5rem;
  font-size: 1.08rem;
}

.stay-card p {
  margin-bottom: 0.65rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.stay-card a {
  display: block;
  margin-top: 0.38rem;
  font-weight: 700;
}

.site-footer {
  padding: 1.45rem 0 1.2rem;
  color: rgba(255, 255, 255, 0.7);
  background: var(--navy-deep);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(270px, 1fr) auto auto;
  align-items: center;
  gap: 1.4rem 2rem;
}

.site-footer h2 {
  margin-bottom: 0.24rem;
  color: var(--white);
  font-size: 1.08rem;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.84);
}

.footer-event p {
  font-size: 0.88rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem 1.05rem;
}

.footer-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.footer-contact {
  white-space: nowrap;
  font-size: 0.9rem;
}

.footer-note {
  margin-top: 0.85rem;
  padding-top: 0.72rem;
  border-top: 1px solid rgba(255, 255, 255, 0.13);
  font-size: 0.79rem;
}

@media (max-width: 960px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 0.7rem 1.25rem 1rem;
    background: var(--navy-deep);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  }

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

  .nav a {
    min-height: 48px;
    display: flex;
    align-items: center;
    padding: 0 0.5rem;
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  }

  .nav a:last-child {
    border-bottom: none;
  }

  .hero {
    min-height: 580px;
  }

  .hero-content {
    align-items: start;
    padding-block: 2.8rem 2.6rem;
  }

  .deadlines-summary {
    grid-template-columns: 1fr;
  }

  .deadline-milestones {
    max-width: 680px;
  }

  .page-shell {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-flow > .section:first-child {
    padding-top: 2.4rem;
  }

  .page-flow > .section-alt {
    margin-inline: 0;
  }

  .side-toc {
    position: sticky;
    top: 76px;
    z-index: 880;
    margin-top: 0;
    padding: 0.7rem 0;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
  }

  .side-toc p {
    margin-bottom: 0.45rem;
  }

  .side-toc .anchor-links {
    display: flex;
    gap: 0.4rem;
    overflow-x: auto;
    scrollbar-width: thin;
  }

  .side-toc .anchor-links a {
    flex: 0 0 auto;
    min-height: 38px;
    padding: 0.45rem 0.7rem;
    border-left: 0;
    border-bottom: 3px solid transparent;
    border-radius: 5px 5px 0 0;
    background: var(--mist);
  }

  .side-toc .anchor-links a.is-active,
  .side-toc .anchor-links a[aria-current="location"] {
    border-bottom-color: var(--burgundy);
    background: #f9edf1;
  }

  .topic-columns,
  .speaker-grid,
  .hotel-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .venue-summary {
    grid-template-columns: 1fr;
  }

  .welcome-card {
    grid-template-columns: 178px minmax(0, 1fr);
  }

  .welcome-card img {
    width: 178px;
    height: 178px;
  }

  .venue-summary img {
    height: 250px;
  }

  .tokyo-gallery {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .footer-nav {
    justify-content: start;
  }
}

@media (max-width: 620px) {
  .container {
    width: 340px;
    max-width: calc(100% - 1.5rem);
    margin-right: auto;
    margin-left: auto;
  }

  .site-header {
    height: 66px;
  }

  .nav {
    top: 66px;
  }

  .brand-logo {
    width: 40px;
    height: 40px;
  }

  .brand-text strong {
    font-size: 1.08rem;
  }

  .brand-text span {
    display: none;
  }

  .hero {
    min-height: 0;
  }

  .hero-content {
    align-items: start;
    padding: 1.9rem 0 1.3rem;
  }

  .hero-content > div {
    width: 100%;
    max-width: calc(100vw - 1.5rem);
  }

  .hero h1 {
    width: 340px;
    max-width: 100%;
    font-size: clamp(1.72rem, 8.2vw, 2.04rem);
    overflow-wrap: anywhere;
  }

  .hero-abbr {
    font-size: clamp(1.55rem, 7vw, 2rem);
  }

  .hero-lead {
    width: 340px;
    max-width: 100%;
    margin: 0.85rem 0 1rem;
    font-size: 0.95rem;
  }

  .event-meta {
    width: 340px;
    max-width: 100%;
    display: grid;
    gap: 0.42rem;
    margin-bottom: 1.1rem;
    font-size: 0.94rem;
  }

  .hero .actions .button {
    flex: 1 1 calc(50% - 0.38rem);
    padding-inline: 0.6rem;
  }

  .hero::after {
    background:
      radial-gradient(ellipse 128% 106% at 5% 10%, rgba(6, 17, 33, 0.9) 0%, rgba(9, 24, 45, 0.78) 50%, rgba(9, 24, 45, 0.28) 82%, rgba(9, 24, 45, 0.09) 100%),
      linear-gradient(180deg, rgba(6, 17, 33, 0.12) 0%, rgba(6, 17, 33, 0.02) 100%);
  }

  .section {
    padding: 2.55rem 0;
  }

  .section[id] {
    scroll-margin-top: 132px;
  }

  .travel-gallery-section {
    padding-block: 2.2rem;
  }

  .section-head {
    display: block;
    margin-bottom: 1.35rem;
  }

  .welcome-card {
    display: block;
    text-align: center;
  }

  .welcome-card img {
    width: 142px;
    height: 142px;
    margin: 0 auto 1.1rem;
  }

  .welcome-card blockquote {
    margin-bottom: 0.85rem;
    font-size: 0.96rem;
  }

  .welcome-card .text-link {
    display: inline-flex;
  }

  .section-head .text-link {
    display: inline-flex;
    margin-top: 0.75rem;
  }

  .deadlines-summary,
  .topic-columns,
  .two-columns,
  .speaker-grid,
  .partner-row {
    grid-template-columns: 1fr;
  }

  .deadlines-summary {
    gap: 1.35rem;
  }

  .deadline-milestones {
    display: block;
  }

  .deadline-milestones div,
  .deadline-milestones div + div {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.2rem;
    align-items: baseline;
    padding: 0.76rem 0;
    border-left: 0;
    border-bottom: 1px solid var(--border);
  }

  .deadline-milestones dt {
    margin: 0;
  }

  .deadline-milestones dd {
    font-size: 0.93rem;
    text-align: left;
  }

  .scope-statement .scope-lead {
    font-size: 1rem;
  }

  .scope-themes {
    margin-top: 1.45rem;
  }

  .scope-themes ul {
    grid-template-columns: 1fr;
  }

  .hero-brand-strip {
    width: 340px;
    max-width: 100%;
  }

  .hero-brand-logos {
    gap: 0.5rem;
  }

  .hero-brand-logos img {
    height: 44px;
    padding: 0.18rem 0.32rem;
  }

  .hero-brand-logos .hero-logo-mark {
    height: 65px;
    max-width: 91px;
  }

  .hero-brand-logos .hero-logo-wide {
    max-width: 174px;
  }

  .publication-panel {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1.15rem 0;
  }

  .home-venue .venue-summary img {
    display: block;
    height: 220px;
  }

  .home-venue .venue-copy {
    padding: 0;
  }

  .partner-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.65rem;
  }

  .home-partners {
    padding-block: 2.2rem;
  }

  .home-partners .section-head {
    margin-bottom: 0.75rem;
  }

  .partner {
    min-height: 88px;
  }

  .partner img {
    max-height: 55px;
  }

  .page-hero {
    padding: 2.4rem 0;
  }

  .page-hero p,
  .page-shell,
  .page-flow,
  .page-flow > .section,
  .page-flow > .section > .container,
  .speaker-card,
  .program-tabs,
  .program-panel {
    min-width: 0;
  }

  .page-hero p {
    max-width: 100%;
    overflow-wrap: break-word;
  }

  .program-tab-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }

  .program-tab {
    min-height: 64px;
    padding: 0.75rem;
  }

  .program-panel-head {
    padding: 1rem;
  }

  .speaker-photo {
    width: 144px;
    height: 144px;
  }

  .agenda {
    padding: 0.2rem 1rem 0.8rem;
  }

  .agenda-row {
    grid-template-columns: 1fr;
    gap: 0.34rem;
    padding: 0.9rem 0;
  }

  .agenda time {
    padding: 0;
  }

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

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

  .committee-list {
    columns: 1;
  }

  .travel-visual {
    grid-template-columns: 1fr;
  }

  .travel-visual img {
    min-height: 185px;
    height: 185px;
  }

  .tokyo-gallery {
    display: flex;
    gap: 0.65rem;
    margin-inline: -0.75rem;
    padding: 0 0.75rem 0.5rem;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: thin;
  }

  .tokyo-gallery figure,
  .tokyo-gallery .gallery-tall {
    flex: 0 0 min(74vw, 270px);
    height: 184px;
    scroll-snap-align: start;
  }

  .hotel-grid,
  .stay-grid {
    display: flex;
    gap: 0.65rem;
    margin-inline: -0.75rem;
    padding: 0 0.75rem 0.5rem;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: thin;
  }

  .hotel,
  .stay-card {
    flex: 0 0 min(76vw, 280px);
    background: var(--white);
    scroll-snap-align: start;
  }

  .hotel img,
  .stay-card-img {
    height: 142px;
  }

  .hero-eyebrow {
    letter-spacing: 0.08em;
    font-size: 0.72rem;
  }

  .site-footer {
    padding: 1rem 0 0.9rem;
  }

  .footer-top {
    gap: 0.62rem;
  }

  .footer-event p,
  .footer-contact,
  .footer-nav a {
    font-size: 0.83rem;
  }

  .footer-note {
    margin-top: 0.62rem;
    padding-top: 0.55rem;
    line-height: 1.45;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sakura-petal { display: none; }
  .hi { animation: none; color: var(--sakura); }
  .hero-abbr-letters { animation: none; }
}