:root {
  --page: #f4f7fb;
  --surface: #ffffff;
  --surface-soft: #eef6f7;
  --surface-blue: #edf3ff;
  --ink: #182033;
  --ink-soft: #38455f;
  --muted: #66738a;
  --line: #d8e0ea;
  --line-strong: #c5d1df;
  --blue: #285ff4;
  --cyan: #00a8c7;
  --teal: #22b99a;
  --green: #7bcf5b;
  --coral: #f06f55;
  --indigo: #4b46b8;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 18px 48px rgba(31, 45, 74, 0.10);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 4%, rgba(0, 168, 199, 0.16), transparent 30%),
    radial-gradient(circle at 90% 6%, rgba(75, 70, 184, 0.12), transparent 26%),
    linear-gradient(180deg, #f9fbff 0%, var(--page) 42%, #f1f5f9 100%);
  font-family: Aptos, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.62;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid rgba(216, 224, 234, 0.82);
  backdrop-filter: blur(18px);
}

.nav-shell {
  width: min(var(--max), calc(100% - 40px));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  color: white;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  border-radius: var(--radius-sm);
  box-shadow: 0 12px 24px rgba(40, 95, 244, 0.22);
}

.brand-mark svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.4;
}

.brand-mark circle {
  fill: currentColor;
  stroke: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 700;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: background-color 160ms ease, color 160ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--blue);
  background: var(--surface-blue);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.hero-section {
  position: relative;
  isolation: isolate;
  width: min(var(--max), calc(100% - 40px));
  min-height: 680px;
  margin: 0 auto 34px;
  padding: 54px 56px 50px;
  overflow: hidden;
  border: 1px solid rgba(194, 218, 227, 0.82);
  border-radius: 24px;
  background-color: #f4f7fb;
  background-image:
    linear-gradient(90deg, rgba(249, 251, 255, 0.98) 0%, rgba(249, 251, 255, 0.94) 38%, rgba(249, 251, 255, 0.70) 55%, rgba(249, 251, 255, 0.22) 75%, rgba(249, 251, 255, 0.04) 100%),
    linear-gradient(180deg, rgba(232, 246, 250, 0.86) 0%, rgba(244, 247, 251, 0.20) 44%, rgba(244, 247, 251, 0.84) 100%),
    url("cover.png"),
    linear-gradient(135deg, #f7fbff 0%, #e5f5fb 52%, #f4f7fb 100%);
  background-position:
    center,
    center,
    right 22px center,
    center;
  background-repeat: no-repeat;
  background-size:
    cover,
    cover,
    min(760px, 62vw) auto,
    cover;
  box-shadow: 0 24px 70px rgba(31, 45, 74, 0.11);
}

.hero-section::after {
  content: "";
  position: absolute;
  z-index: 0;
  inset: 16px;
  border: 1px solid rgba(0, 168, 199, 0.16);
  border-radius: 18px;
  pointer-events: none;
}

.hero-ribbon {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
}

.hero-ribbon span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 12px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
}

.hero-grid {
  display: grid;
  position: relative;
  z-index: 1;
  grid-template-columns: minmax(0, 760px);
  align-items: center;
  min-height: 510px;
}

.hero-copy {
  position: relative;
  z-index: 1;
  min-width: 0;
  max-width: 760px;
}

.hero-copy::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -22px -42px -24px -28px;
  border-radius: 22px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.66), rgba(255, 255, 255, 0.38) 68%, rgba(255, 255, 255, 0));
  backdrop-filter: blur(2px);
  pointer-events: none;
}

.hero-kicker,
.section-label {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  letter-spacing: 0.04em;
}

.acronym-badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 6px 10px;
  color: white;
  background: linear-gradient(135deg, var(--ink), var(--indigo));
  border-radius: var(--radius-sm);
  letter-spacing: 0;
  text-transform: none;
  box-shadow: 0 12px 26px rgba(31, 45, 74, 0.16);
}

.hero-copy h1,
.section h2,
.final-cta h2 {
  margin: 0;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: -0.035em;
}

.hero-copy h1 {
  max-width: 780px;
  font-size: clamp(2.2rem, 3.05vw, 3.25rem);
  line-height: 1.12;
  text-wrap: balance;
}

.hero-lead {
  max-width: 690px;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: 1.12rem;
  line-height: 1.66;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  font-size: 0.95rem;
  font-weight: 800;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary,
.button-dark {
  color: white;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  box-shadow: 0 12px 26px rgba(40, 95, 244, 0.18);
}

.button-secondary,
.button-light {
  color: var(--blue);
  background: var(--surface);
  border-color: var(--line-strong);
}

.button-secondary:hover,
.button-secondary:focus-visible,
.button-light:hover,
.button-light:focus-visible {
  box-shadow: 0 10px 22px rgba(31, 45, 74, 0.10);
}

.hero-briefing {
  scroll-margin-top: 92px;
  max-width: 760px;
  margin-top: 30px;
  padding: 22px;
  border: 1px solid rgba(197, 209, 223, 0.88);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.90), rgba(237, 243, 255, 0.78)),
    var(--surface);
  box-shadow: 0 14px 32px rgba(31, 45, 74, 0.08);
}

.hero-briefing-copy {
  display: grid;
  gap: 8px;
}

.hero-briefing-copy .section-label {
  margin-bottom: 0;
}

.hero-briefing-copy h2 {
  margin: 0;
  color: var(--ink);
  font-size: 1.18rem;
  line-height: 1.22;
  letter-spacing: -0.02em;
}

.hero-briefing-copy p {
  max-width: 700px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.94rem;
  line-height: 1.55;
}

.hero-briefing-copy a {
  color: var(--blue);
  font-weight: 800;
  text-decoration: none;
}

.hero-briefing-copy a:hover,
.hero-briefing-copy a:focus-visible {
  text-decoration: underline;
}

.hero-date-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 16px;
}

.hero-date-list .date-item {
  grid-template-columns: 1fr;
  gap: 6px;
  min-height: 82px;
  padding: 13px 14px;
  background: rgba(255, 255, 255, 0.82);
}

.hero-date-list .date-item span {
  font-size: 0.92rem;
}

.hero-date-list .date-item strong {
  gap: 6px;
  font-size: 0.9rem;
  line-height: 1.35;
}

.hero-date-list .date-item:last-child {
  grid-column: 1 / -1;
}

.scope-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 15px;
}

.scope-preview span {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 32px;
  padding: 7px 10px;
  color: var(--ink-soft);
  border: 1px solid rgba(197, 209, 223, 0.86);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  font-size: 0.83rem;
  font-weight: 750;
  line-height: 1.25;
}

.section {
  scroll-margin-top: 92px;
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto 22px;
  padding: 58px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 14px 38px rgba(31, 45, 74, 0.07);
}

.section-light,
.final-cta {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(239, 248, 250, 0.92)),
    var(--surface);
}

.section-dark {
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(236, 245, 255, 0.95), rgba(234, 250, 245, 0.94)),
    var(--surface);
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.75fr) minmax(0, 1.25fr);
  gap: 48px;
  align-items: start;
}

.section h2,
.final-cta h2 {
  font-size: clamp(1.85rem, 2.55vw, 2.8rem);
  line-height: 1.12;
  text-wrap: balance;
}

.section-prose {
  padding: 26px 28px;
  border: 1px solid #cfe0e6;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(238, 246, 247, 0.76), rgba(237, 243, 255, 0.72));
}

.section-prose p {
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 1.04rem;
}

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

.feature-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.feature-strip article,
.submission-types article,
.schedule-list article,
.organizer-grid article {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.feature-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 28px;
  margin-bottom: 22px;
  color: white;
  background: var(--blue);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 800;
}

.feature-strip h3,
.submission-types h3,
.schedule-list h3,
.organizer-grid h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 1.12rem;
  line-height: 1.25;
}

.feature-strip p,
.submission-types p,
.schedule-list p,
.organizer-grid p,
.final-cta p {
  margin: 0;
  color: var(--muted);
}

.section-heading {
  max-width: 840px;
  margin-bottom: 34px;
}

.section-note {
  max-width: 720px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.section-note a {
  color: var(--blue);
  font-weight: 800;
  text-decoration: none;
}

.section-note a:hover,
.section-note a:focus-visible {
  text-decoration: underline;
}

.topic-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  counter-reset: topic;
}

.topic-list article {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  min-height: 62px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #fff, #f8fbff);
  color: var(--ink-soft);
  font-size: 0.96rem;
  font-weight: 700;
  line-height: 1.4;
  counter-increment: topic;
}

.topic-list article::before {
  content: counter(topic, decimal-leading-zero);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 28px;
  color: white;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 850;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(360px, 1.12fr);
  gap: 16px;
  overflow: hidden;
}

.submission-panel {
  padding: 34px;
  border: 1px solid #bcd9df;
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(234, 247, 250, 0.98), rgba(237, 243, 255, 0.96)),
    var(--surface-soft);
}

.submission-panel p:not(.section-label) {
  color: var(--ink-soft);
  margin: 18px 0 20px;
}

.submission-panel p a {
  color: var(--blue);
  font-weight: 800;
  text-decoration: none;
}

.submission-panel p a:hover,
.submission-panel p a:focus-visible {
  text-decoration: underline;
}

.submission-checklist {
  display: grid;
  gap: 8px;
  padding: 0;
  margin: 0 0 26px;
  list-style: none;
}

.submission-checklist li {
  padding: 11px 13px;
  color: var(--ink-soft);
  border: 1px solid rgba(197, 209, 223, 0.86);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.72);
  font-weight: 700;
  line-height: 1.35;
}

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

.submission-types {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.submission-types article {
  min-height: 190px;
}

.date-list {
  display: grid;
  gap: 10px;
}

.date-item {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 22px;
  align-items: center;
  min-height: 66px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.date-item span {
  color: var(--blue);
  font-weight: 800;
}

.date-item strong {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 1rem;
}

.schedule-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.schedule-list article {
  display: grid;
  grid-template-columns: 150px minmax(220px, 0.52fr) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  min-height: 86px;
  padding: 18px 20px;
  background: linear-gradient(180deg, #fff, #f8fbff);
}

.schedule-list time {
  display: inline-flex;
  width: max-content;
  color: var(--blue);
  background: var(--surface-blue);
  border-radius: var(--radius-sm);
  padding: 6px 9px;
  font-size: 0.82rem;
  font-weight: 800;
}

.schedule-list h3 {
  margin-top: 3px;
}

.schedule-list p {
  line-height: 1.55;
}

.organizer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.organizer-grid article {
  background: rgba(255, 255, 255, 0.80);
}

.organizer-photo {
  width: 108px;
  height: 108px;
  display: block;
  margin-bottom: 24px;
  object-fit: cover;
  object-position: center;
  border: 1px solid rgba(198, 222, 229, 0.95);
  border-radius: var(--radius);
  background: var(--surface-blue);
  box-shadow: 0 14px 28px rgba(31, 45, 74, 0.12);
}

.organizer-photo-shiwei {
  object-position: center 38%;
}

.organizer-photo-jinghui {
  object-position: center 36%;
}

.organizer-photo-zhanxun {
  object-position: center 18%;
}

.organizer-grid a {
  display: inline-flex;
  margin-top: 12px;
  color: var(--blue);
  font-weight: 750;
  text-decoration: none;
  overflow-wrap: anywhere;
}

.final-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 38px;
  align-items: center;
}

.final-cta p {
  max-width: 740px;
  margin-top: 18px;
  font-size: 1.04rem;
}

.cta-stack {
  display: grid;
  gap: 12px;
}

.status-note {
  display: block;
  min-height: 48px;
  padding: 13px 15px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.72);
  font-weight: 700;
  text-decoration: none;
  overflow-wrap: anywhere;
}

a.status-note:hover,
a.status-note:focus-visible {
  color: var(--blue);
  border-color: rgba(40, 95, 244, 0.42);
}

.site-footer {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 34px 0 54px;
  color: var(--muted);
  font-size: 0.94rem;
}

.site-footer p {
  margin: 0;
}

@keyframes pulse-ring {
  0%, 100% {
    transform: scale(0.94);
    opacity: 0.85;
  }

  50% {
    transform: scale(1.08);
    opacity: 0.32;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media (max-width: 1080px) {
  .section-grid,
  .split-section,
  .final-cta {
    grid-template-columns: 1fr;
  }

  .hero-section {
    min-height: auto;
    padding: 44px 42px 42px;
    background-position:
      center,
      center,
      right -90px center,
      center;
    background-size:
      cover,
      cover,
      min(680px, 78vw) auto,
      cover;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 720px);
    min-height: auto;
  }

  .hero-copy h1 {
    font-size: clamp(2.1rem, 5vw, 3rem);
  }

}

@media (max-width: 760px) {
  .nav-shell {
    width: calc(100vw - 28px);
    max-width: var(--max);
    min-height: 66px;
  }

  .brand {
    font-size: 0.96rem;
  }

  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 66px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
  }

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

  .nav-links a {
    justify-content: center;
  }

  .hero-section,
  .section,
  .site-footer {
    width: calc(100vw - 28px);
    max-width: var(--max);
  }

  .hero-section {
    padding: 32px 20px 34px;
    background-image:
      linear-gradient(180deg, rgba(249, 251, 255, 0.96) 0%, rgba(249, 251, 255, 0.82) 44%, rgba(249, 251, 255, 0.94) 100%),
      linear-gradient(180deg, rgba(232, 246, 250, 0.74) 0%, rgba(244, 247, 251, 0.22) 42%, rgba(244, 247, 251, 0.82) 100%),
      url("cover.png"),
      linear-gradient(135deg, #f7fbff 0%, #e5f5fb 52%, #f4f7fb 100%);
    background-position:
      center,
      center,
      center 120px,
      center;
    background-size:
      cover,
      cover,
      560px auto,
      cover;
  }

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

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

  .hero-ribbon {
    gap: 6px;
    margin-bottom: 24px;
  }

  .hero-ribbon span {
    flex: 1 1 100%;
    justify-content: center;
  }

  .hero-copy h1 {
    font-size: 1.86rem;
    line-height: 1.07;
  }

  .hero-copy::before {
    inset: -16px -14px -18px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.76), rgba(255, 255, 255, 0.48));
  }

  .hero-lead {
    font-size: 1rem;
  }

  .hero-actions,
  .submission-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .hero-date-list,
  .feature-strip,
  .topic-list,
  .submission-types,
  .schedule-list,
  .organizer-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 32px 20px;
    margin-bottom: 16px;
  }

  .section h2,
  .final-cta h2 {
    font-size: 1.9rem;
  }

  .section-prose {
    padding: 20px;
  }

  .topic-list article,
  .feature-strip article,
  .submission-types article,
  .schedule-list article,
  .organizer-grid article {
    min-height: auto;
    padding: 20px;
  }

  .schedule-list article {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .date-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .final-cta {
    padding: 32px 20px;
  }
}

@media (max-width: 460px) {
  .brand span:last-child {
    max-width: 170px;
    line-height: 1.1;
  }

  .hero-copy h1 {
    font-size: 1.74rem;
  }
}