:root {
  --ink: #212121;
  --muted: #5d6970;
  --brand: #226e93;
  --brand-dark: #1e5f7c;
  --link: #0b5394;
  --tint: #f2f6f7;
  --line: #d9e4e8;
  --white: #ffffff;
  --gold: #d59d49;
  --coral: #c86d5c;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

section {
  scroll-margin-top: 96px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "PT Sans", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
  padding: 0 48px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(33, 33, 33, 0.12);
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0;
}

.brand-logo {
  display: block;
  width: 46px;
  height: 46px;
  border: 2px solid rgba(34, 110, 147, 0.24);
  border-radius: 50%;
  background: var(--white);
  object-fit: cover;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 24px;
  font-size: 15px;
  font-weight: 700;
}

.nav a {
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

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

.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: var(--white);
  background: var(--brand-dark);
}

.hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(12, 39, 51, 0.88) 0%, rgba(20, 68, 88, 0.72) 42%, rgba(30, 95, 124, 0.22) 100%),
    linear-gradient(0deg, rgba(0, 0, 0, 0.18), rgba(0, 0, 0, 0.18));
}

.hero-content {
  position: relative;
  width: min(1120px, calc(100% - 64px));
  margin: 0 auto;
  padding: 72px 0 80px;
}

.eyebrow {
  margin: 0 0 16px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  color: rgba(255, 255, 255, 0.9);
}

h1,
h2,
h3,
h4 {
  font-family: Merriweather, Georgia, serif;
  line-height: 1.25;
}

h1 {
  max-width: 800px;
  margin: 0;
  font-size: 48px;
  font-weight: 700;
}

h2 {
  margin: 0 0 28px;
  color: var(--brand);
  font-size: 34px;
  text-align: center;
}

h3 {
  margin: 0 0 10px;
  color: var(--brand-dark);
  font-size: 19px;
}

h4 {
  margin: 24px 0 8px;
  color: var(--ink);
  font-size: 17px;
}

.tagline {
  max-width: 760px;
  margin: 22px 0 0;
  font-size: 22px;
}

.event-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  max-width: 820px;
  margin: 20px 0 0;
  font-weight: 700;
  color: #fff7e9;
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.meta-item::before {
  display: inline-grid;
  width: 24px;
  height: 24px;
  place-items: center;
  border: 1px solid rgba(255, 247, 233, 0.55);
  border-radius: 50%;
  color: var(--white);
  font-size: 13px;
}

.meta-date::before {
  content: "◷";
}

.meta-venue::before {
  content: "🎓";
}

.meta-place::before {
  content: "📍";
}

.event-meta a {
  color: inherit;
  text-decoration-color: rgba(255, 247, 233, 0.7);
  text-underline-offset: 3px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.hero-actions a {
  display: grid;
  min-width: 210px;
  padding: 18px 20px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.42);
  text-decoration: none;
  backdrop-filter: blur(8px);
}

.hero-actions span {
  font-family: Merriweather, Georgia, serif;
  font-size: 21px;
  font-weight: 700;
}

.hero-actions small {
  margin-top: 4px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 14px;
}

.hero-actions a:hover {
  background: rgba(255, 255, 255, 0.25);
}

.section {
  padding: 70px 0;
}

.section-tint {
  background: var(--tint);
}

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

.section-dark h2,
.section-dark h3,
.section-dark a {
  color: var(--white);
}

.section-inner {
  width: min(1080px, calc(100% - 48px));
  margin: 0 auto;
}

.narrow {
  max-width: 900px;
}

.narrow h2 {
  text-align: left;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 46px;
  align-items: start;
}

.intro-grid h2 {
  text-align: left;
}

.lead {
  max-width: 850px;
  margin: -8px auto 32px;
  text-align: center;
  font-size: 20px;
}

.fact-panel {
  padding: 28px;
  border: 1px solid var(--line);
  border-left: 6px solid var(--brand);
  background: var(--white);
}

.fact-panel h3 {
  margin-bottom: 18px;
}

dl {
  margin: 0;
}

dt {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
}

dd {
  margin: 0 0 16px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
}

.topic-grid > div,
.person,
.notice {
  border: 1px solid var(--line);
  background: var(--white);
}

.topic-grid > div {
  padding: 24px;
}

.notice {
  margin-top: 28px;
  padding: 20px 24px;
  border-left: 6px solid var(--gold);
}

.timeline-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.timeline-columns.single {
  grid-template-columns: minmax(0, 760px);
  justify-content: center;
}

.timeline-card {
  padding: 30px;
  border: 1px solid var(--line);
  border-top: 6px solid var(--brand);
  background: var(--white);
}

.primary-timeline {
  border-top-color: var(--coral);
}

.timeline-list {
  display: grid;
  gap: 14px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.timeline-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.timeline-list span {
  font-weight: 700;
}

.timeline-list time {
  color: var(--brand-dark);
  white-space: nowrap;
}

.small-note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.deadline-note {
  margin: -12px auto 28px;
  color: var(--muted);
  text-align: center;
}

.deadline-note a {
  font-weight: 700;
}

.section-heading-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 26px;
  flex-wrap: wrap;
}

.section-heading-row h2 {
  margin: 0;
}

.platform-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 22px;
  padding: 18px;
  border-left: 6px solid var(--coral);
  background: #fff7f4;
}

#shared-task .platform-note {
  margin: 0;
}

.heading-platform {
  padding: 10px 12px;
  border-left-width: 4px;
  font-size: 15px;
}

.platform-note strong {
  margin-right: 6px;
}

.platform-note a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 4px 12px;
  color: var(--white);
  background: var(--brand);
  text-decoration: none;
  font-weight: 700;
}

.center-link {
  margin: -14px 0 32px;
  text-align: center;
  font-weight: 700;
}

.overview-figure {
  margin: -4px auto 32px;
  max-width: 820px;
}

.overview-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: 0 18px 42px rgba(33, 33, 33, 0.12);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: start;
  margin-bottom: 28px;
}

.clean-list {
  padding-left: 20px;
}

.clean-list li {
  margin-bottom: 12px;
}

table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
}

th,
td {
  padding: 13px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

th {
  color: var(--white);
  background: var(--brand);
  font-weight: 700;
}

.person-grid {
  display: grid;
  gap: 24px;
}

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

.organizers {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px 18px;
}

.speaker-stack {
  display: grid;
  gap: 28px;
}

.keynote-card {
  display: grid;
  grid-template-columns: 124px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.1);
}

.portrait-wrap,
.organizer-photo {
  display: grid;
  place-items: center;
  overflow: hidden;
  background: rgba(34, 110, 147, 0.1);
}

.portrait-wrap {
  width: 100%;
  aspect-ratio: 3 / 4;
}

.speaker-note {
  margin: -14px 0 28px;
  color: #fff7e9;
  text-align: center;
  font-size: 18px;
  font-weight: 700;
}

.portrait-wrap img,
.organizer-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.photo-fallback {
  display: grid;
  width: 100%;
  height: 100%;
  place-items: center;
  color: var(--white);
  background: linear-gradient(135deg, var(--brand), var(--coral));
  font-family: Merriweather, Georgia, serif;
  font-size: 40px;
  font-weight: 700;
}

.photo-fallback[hidden] {
  display: none;
}

.role-label {
  margin: 0 0 6px;
  color: #fff7e9;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

.keynote-copy {
  align-self: start;
}

.keynote-card h3 {
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--white);
  font-size: 24px;
}

.bio-text {
  font-size: 14px;
  line-height: 1.55;
}

.bio-collapse {
  display: inline;
  margin: 0;
}

.bio-collapse summary {
  display: inline;
  color: #fff7e9;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
}

.bio-collapse summary::marker {
  color: var(--gold);
}

.bio-preview,
.bio-collapse p {
  margin: 0;
  font-size: inherit;
  line-height: inherit;
}

.bio-collapse p {
  display: block;
  margin-top: 8px;
}

.person {
  padding: 26px;
  text-align: center;
}

.organizers .person {
  padding: 0;
  border: 0;
  background: transparent;
}

.section-dark .person {
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.1);
}

.avatar {
  display: grid;
  width: 100px;
  height: 100px;
  place-items: center;
  margin: 0 auto 18px;
  color: var(--white);
  background: linear-gradient(135deg, var(--brand), var(--coral));
  border-radius: 50%;
  font-family: Merriweather, Georgia, serif;
  font-size: 26px;
  font-weight: 700;
}

.person p {
  margin: 8px 0;
}

.compact {
  padding: 18px 16px;
}

.organizer-photo {
  width: 92px;
  height: 92px;
  margin: 0 auto 12px;
  border: 3px solid var(--gold);
  border-radius: 50%;
  background: transparent;
  box-shadow: 0 8px 20px rgba(35, 48, 62, 0.1);
}

.organizer-photo img {
  border-radius: inherit;
  object-position: center;
}

.organizer-photo img[src$="lanyunshi.png"] {
  transform: scale(0.86);
}

.organizer-photo img[src$="zhengyuan-liu.jpg"],
.organizer-photo img[src$="nancy-chen.jpg"] {
  transform: scale(1.1);
}

.organizer-photo .photo-fallback {
  font-size: 28px;
}

.compact h3 {
  margin-bottom: 4px;
  font-size: 17px;
}

.compact p {
  margin: 0;
  font-size: 15px;
  line-height: 1.35;
}

.compact a {
  overflow-wrap: anywhere;
}

.pc-list {
  max-width: 930px;
  margin: 0 auto;
  text-align: center;
}

.prose {
  max-width: 980px;
}

.prose h2 {
  margin-bottom: 34px;
}

.prose h3 {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 24px;
}

.prose h3:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.guideline-list {
  padding-left: 22px;
}

.guideline-list li {
  margin-bottom: 10px;
}

.warning {
  margin: 22px 0;
  padding: 18px 22px;
  border-left: 6px solid var(--coral);
  background: #fff7f4;
  font-weight: 700;
}

.placeholder-link {
  color: var(--brand-dark);
  font-weight: 700;
}

.task-report-note {
  margin: 22px auto 0;
  padding: 18px 22px;
  border-left: 6px solid var(--gold);
  background: #fff8e6;
  color: var(--ink);
  font-weight: 700;
}

.committee-list {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 9px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.committee-list li {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 2px;
  min-height: 58px;
  padding: 7px 0 8px;
  border-top: 1px solid rgba(90, 115, 132, 0.18);
  background: transparent;
  font-size: 11.5px;
  line-height: 1.22;
  text-align: left;
}

.committee-list strong,
.committee-list span {
  display: block;
}

.committee-list span {
  color: var(--muted);
  overflow-wrap: anywhere;
}

.footer {
  padding: 34px 24px;
  color: var(--white);
  background: #212121;
  text-align: center;
  font-family: Georgia, "Times New Roman", serif;
}

.footer p {
  margin: 6px 0;
}

.footer a {
  color: #49aad4;
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 24px;
  }

  .nav {
    flex-wrap: wrap;
    gap: 14px 20px;
  }

  h1 {
    font-size: 38px;
  }

  .intro-grid,
  .split {
    grid-template-columns: 1fr;
  }

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

  .timeline-columns,
  .keynote-card {
    grid-template-columns: 1fr;
  }

  .portrait-wrap {
    max-width: 136px;
  }
}

@media (max-width: 620px) {
  body {
    font-size: 16px;
  }

  .site-header {
    position: static;
  }

  .hero {
    min-height: 560px;
  }

  .hero-content,
  .section-inner {
    width: min(100% - 32px, 1080px);
  }

  h1 {
    font-size: 30px;
  }

  h2 {
    font-size: 27px;
  }

  .tagline {
    font-size: 19px;
  }

  .topic-grid,
  .speakers,
  .organizers {
    grid-template-columns: 1fr;
  }

  .timeline-card,
  .keynote-card {
    padding: 22px;
  }

  .hero-actions a {
    min-width: 100%;
  }

  .timeline-list li {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .timeline-list time {
    white-space: normal;
  }
}