:root {
  --ink: #102326;
  --muted: #5b6b70;
  --line: #dbe4e4;
  --paper: #f7f9f7;
  --white: #ffffff;
  --teal: #0e7c7b;
  --teal-dark: #075e61;
  --gold: #c58a2a;
  --red: #b24b42;
  --shadow: 0 22px 60px rgba(10, 29, 31, 0.13);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.6;
}

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

a:hover {
  color: var(--teal);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 14px clamp(20px, 4vw, 56px);
  background: rgba(247, 249, 247, 0.94);
  border-bottom: 1px solid rgba(16, 35, 38, 0.1);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand-mark {
  width: 36px;
  height: 36px;
  object-fit: contain;
  background: var(--white);
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(16, 35, 38, 0.12);
}

nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 4px 18px;
  color: #33474c;
  font-size: 0.95rem;
  font-weight: 650;
}

nav a {
  padding: 8px 0;
}

.hero {
  position: relative;
  min-height: calc(100vh - 72px);
  max-height: 820px;
  display: grid;
  align-items: end;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(7, 26, 29, 0.92) 0%, rgba(7, 26, 29, 0.64) 46%, rgba(7, 26, 29, 0.16) 100%),
    url("images/shanghai-skyline.jpg") center / cover no-repeat;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 32, 33, 0) 58%, rgba(247, 249, 247, 0.95) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  width: min(980px, calc(100% - 40px));
  margin: 0 auto;
  padding: 88px 0 118px;
  color: var(--white);
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 830px;
  margin-bottom: 20px;
  font-size: clamp(3rem, 7vw, 5.6rem);
  line-height: 0.95;
  letter-spacing: 0;
}

h1 span {
  display: block;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.15rem;
  line-height: 1.2;
}

.hero-subtitle {
  max-width: 660px;
  margin-bottom: 28px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.22rem;
}

.hero-logos {
  display: inline-flex;
  align-items: center;
  margin-bottom: 24px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: 8px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.18);
}

.hero-logos img {
  display: block;
  width: min(220px, 46vw);
  height: auto;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.96rem;
  font-weight: 700;
}

.hero-meta span {
  padding: 7px 12px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.18);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 800;
}

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

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

.button-secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.1);
}

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

.section {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 86px 0;
}

.band {
  width: 100%;
  padding-right: max(20px, calc((100% - 1180px) / 2));
  padding-left: max(20px, calc((100% - 1180px) / 2));
  background: var(--white);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.intro-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 34px;
  padding-bottom: 34px;
}

.stat {
  padding: 18px 20px;
  border-left: 3px solid var(--teal);
  background: rgba(255, 255, 255, 0.7);
}

.stat strong,
.stat span {
  display: block;
}

.stat strong {
  font-size: 1.35rem;
  line-height: 1.1;
}

.stat span {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

.content-layout {
  display: grid;
  grid-template-areas: "sidebar main";
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 86px 0;
  align-items: start;
}

.main-column {
  grid-area: main;
  display: flex;
  flex-direction: column;
  gap: 64px;
  min-width: 0;
}

.sidebar-stack {
  grid-area: sidebar;
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}

.content-section {
  min-width: 0;
}

.cfp-panel {
  padding: 36px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 36px rgba(16, 35, 38, 0.06);
}

.cfp-panel .topic-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.two-column {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: clamp(32px, 7vw, 90px);
  align-items: start;
}

#about {
  grid-template-columns: minmax(240px, 0.9fr) minmax(0, 1.35fr);
  gap: clamp(36px, 5vw, 72px);
}

#about h2 {
  max-width: 520px;
  font-size: clamp(2.1rem, 3vw, 2.75rem);
  line-height: 1.14;
}

#about .prose {
  max-width: 690px;
  font-size: 1.02rem;
  line-height: 1.75;
}

.prose {
  color: #31484c;
  font-size: 1.05rem;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading p:last-child {
  color: var(--muted);
  font-size: 1.05rem;
}

.topic-grid,
.instruction-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.topic-grid article,
.instruction-grid article,
.person-card,
.panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 36px rgba(16, 35, 38, 0.06);
}

.band .topic-grid article,
.band .instruction-grid article,
.band .panel {
  background: #fbfcfb;
}

.topic-grid article,
.instruction-grid article {
  padding: 26px;
}

ul {
  padding-left: 1.2rem;
}

li + li {
  margin-top: 8px;
}

.panel {
  padding: 26px;
}

.panel h2 {
  font-size: 1.45rem;
}

.sidebar-stack .panel {
  overflow: hidden;
  padding: 0;
}

.sidebar-stack .panel h2 {
  margin: 0;
  padding: 18px 24px;
  color: var(--white);
  background: var(--teal);
}

.sidebar-stack .panel > :not(h2) {
  margin-right: 24px;
  margin-left: 24px;
}

.sidebar-stack .panel > :not(h2):first-of-type {
  margin-top: 22px;
}

.sidebar-stack .panel > :not(h2):last-child {
  margin-bottom: 24px;
}

.news-item + .news-item {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

time,
.news-item p,
.dates dd,
.link-list,
.person-card p,
.person-card span {
  color: var(--muted);
}

.news-item p,
.dates dd,
.dates dt {
  margin: 0;
}

.dates {
  margin: 0;
}

.dates div + div {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.dates dt {
  font-weight: 800;
}

.link-list {
  margin: 0;
}

.person-grid,
.organizer-grid {
  display: grid;
  gap: 18px;
}

.person-grid {
  grid-template-columns: repeat(4, 1fr);
}

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

.organizer-grid {
  grid-template-columns: repeat(5, 1fr);
}

.person-card {
  min-height: 230px;
  padding: 24px;
}

.person-card p {
  margin-bottom: 12px;
}

.person-card span {
  display: block;
  font-size: 0.95rem;
}

.organizer-card {
  display: flex;
  flex-direction: column;
  min-height: 410px;
}

.organizer-card h3 {
  margin-bottom: 6px;
}

.person-photo {
  width: 100%;
  aspect-ratio: 1 / 1;
  margin-bottom: 20px;
  border-radius: 8px;
  object-fit: cover;
  object-position: center;
  background: #e5eded;
}

.profile-link {
  width: max-content;
  margin-top: auto;
  padding-top: 18px;
  color: var(--teal-dark);
  font-weight: 800;
}

.avatar {
  display: grid;
  place-items: center;
  width: 88px;
  height: 88px;
  margin-bottom: 22px;
  color: var(--white);
  background:
    radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.28), transparent 32%),
    linear-gradient(135deg, var(--teal-dark), var(--teal) 58%, var(--gold));
  border-radius: 50%;
  font-size: 2rem;
  font-weight: 850;
}

.schedule-table,
.paper-table {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.schedule-table [role="row"],
.paper-table [role="row"] {
  display: grid;
  gap: 0;
  border-bottom: 1px solid var(--line);
}

.schedule-table [role="row"] {
  grid-template-columns: minmax(140px, 0.45fr) minmax(220px, 1.2fr) minmax(140px, 0.45fr);
}

.paper-table [role="row"] {
  grid-template-columns: 60px minmax(220px, 1.1fr) minmax(180px, 0.8fr) minmax(120px, 0.45fr);
}

.schedule-table [role="row"]:last-child,
.paper-table [role="row"]:last-child {
  border-bottom: 0;
}

.schedule-table span,
.paper-table span {
  padding: 16px 18px;
}

.schedule-head,
.paper-head {
  color: var(--white);
  background: var(--teal-dark);
  font-weight: 850;
}

.committee-list {
  columns: 2;
  column-gap: 48px;
  margin-bottom: 0;
  color: #33474c;
}

.committee-list li {
  break-inside: avoid;
  margin-bottom: 8px;
}

.site-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 20px;
  color: rgba(255, 255, 255, 0.76);
  background: #0b2528;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

.asset-credit {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: min(100%, 900px);
  margin: 10px auto 0;
  color: rgba(255, 255, 255, 0.58);
  font-size: 0.82rem;
  text-align: center;
}

.asset-credit span {
  display: block;
  width: 100%;
  text-align: center;
}

.asset-credit span + span {
  margin-top: 4px;
}

.asset-credit a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    justify-content: flex-start;
  }

  .hero {
    min-height: 760px;
  }

  .content-layout {
    grid-template-areas:
      "main"
      "sidebar";
    grid-template-columns: 1fr;
  }

  .intro-strip,
  .topic-grid,
  .instruction-grid,
  .person-grid,
  .organizer-grid,
  .person-grid.compact,
  .two-column {
    grid-template-columns: 1fr 1fr;
  }

  .cfp-panel .topic-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-header {
    position: static;
    min-height: 0;
  }

  nav {
    gap: 0 14px;
    font-size: 0.9rem;
  }

  .hero {
    min-height: 690px;
    background-position: 64% center;
  }

  .hero-content {
    width: min(100% - 32px, 620px);
    padding: 72px 0 92px;
  }

  h1 {
    font-size: 3rem;
  }

  .hero-subtitle {
    font-size: 1.05rem;
  }

  .section {
    width: min(100% - 32px, 1180px);
    padding: 62px 0;
  }

  .band {
    width: 100%;
    padding-right: 16px;
    padding-left: 16px;
  }

  .content-layout {
    width: min(100% - 32px, 1180px);
    padding: 62px 0;
  }

  .main-column {
    gap: 48px;
  }

  .cfp-panel {
    padding: 24px;
  }

  .cfp-panel .topic-grid {
    grid-template-columns: 1fr;
  }

  .intro-strip,
  .topic-grid,
  .instruction-grid,
  .person-grid,
  .organizer-grid,
  .person-grid.compact,
  .two-column {
    grid-template-columns: 1fr;
  }

  .schedule-table,
  .paper-table {
    overflow-x: auto;
  }

  .schedule-table [role="row"] {
    min-width: 680px;
  }

  .paper-table [role="row"] {
    min-width: 760px;
  }

  .committee-list {
    columns: 1;
  }
}