:root {
  --bg: #07111f;
  --bg-soft: #0d1b2f;
  --card: rgba(255, 255, 255, 0.07);
  --card-strong: rgba(255, 255, 255, 0.12);
  --text: #f6f8fb;
  --muted: #b8c3d6;
  --line: rgba(255, 255, 255, 0.16);
  --gold: #c69214;
  --cyan: #58d5ff;
  --blue: #5a7dff;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(88, 213, 255, 0.18), transparent 34rem),
    radial-gradient(circle at top right, rgba(198, 146, 20, 0.16), transparent 32rem),
    var(--bg);
  color: var(--text);
  font-family:
    "IBM Plex Sans", "Noto Sans SC", "Segoe UI", sans-serif;
  line-height: 1.65;
  font-feature-settings: "ss01" 0, "kern" 1;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 17, 31, 0.82);
  backdrop-filter: blur(16px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px;
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.02em;
  min-width: 0;
}

.brand-logo {
  display: block;
  height: 36px;
  width: auto;
  max-width: min(280px, 46vw);
  object-fit: contain;
  background: #fff;
  border-radius: 8px;
  padding: 4px 8px;
}

.brand-mark {
  color: var(--gold);
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
}

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

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  padding: 8px 14px;
}

.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 92px 24px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.92fr);
  min-height: 720px;
  align-items: center;
  gap: 56px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--gold);
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 18px;
  font-size: clamp(2.35rem, 5.2vw, 3.75rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 700;
}

h2 {
  margin-bottom: 28px;
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 700;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.08rem;
  line-height: 1.35;
  letter-spacing: 0;
  font-weight: 600;
}

.hero-subtitle {
  color: var(--cyan);
  font-size: clamp(1.2rem, 2.4vw, 1.65rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  margin-bottom: 16px;
}

.hero-text,
.section-copy,
.card p,
.speaker-card p,
.footer {
  color: var(--muted);
}

.hero-text {
  max-width: 700px;
  font-size: 1.12rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 13px 20px;
  font-weight: 800;
}

.button.primary {
  background: var(--gold);
  color: #111827;
}

.button.secondary {
  border: 1px solid var(--line);
  color: var(--text);
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  max-height: min(520px, 70vh);
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  background: #f4f7fb;
  box-shadow: var(--shadow);
  padding: 12px;
}

.hero-image {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  max-height: min(496px, calc(70vh - 24px));
  object-fit: contain;
  object-position: center;
}

.overview-section {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 40px;
  align-items: center;
  border-top: 1px solid var(--line);
}

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

.overview-copy strong {
  color: var(--text);
  font-weight: 600;
}

.pull-quote {
  margin: 0 0 18px;
  padding: 14px 0 14px 16px;
  border-left: 3px solid var(--gold);
  color: var(--text) !important;
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.45;
}

.overview-figure {
  margin: 0;
}

.overview-figure img {
  display: block;
  width: 100%;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fff;
}

.overview-figure figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.conf-meta {
  margin-bottom: 10px;
}

.conf-meta strong {
  color: var(--cyan);
  font-weight: 600;
  margin-right: 8px;
}

.split {
  display: grid;
  grid-template-columns: minmax(220px, 0.78fr) minmax(0, 1.22fr);
  gap: 52px;
  border-top: 1px solid var(--line);
}

.card-grid {
  display: grid;
  gap: 18px;
}

.card-grid.four,
.card-grid.speakers {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

.card,
.speaker-card,
.timeline-item,
.resource-card {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--card);
  padding: 24px;
}

.card.highlight {
  background: linear-gradient(135deg, rgba(198, 146, 20, 0.16), rgba(88, 213, 255, 0.08));
}

.section-lead {
  margin: -8px 0 28px;
  color: var(--muted);
  max-width: 52rem;
}

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

.inline-link:hover {
  color: var(--text);
}

.timeline {
  display: grid;
  gap: 16px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.time {
  color: var(--cyan);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.outline-list {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--muted);
  display: grid;
  gap: 8px;
}

.outline-list li {
  padding-left: 2px;
}

.cn-name {
  margin-left: 6px;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.95em;
}

.speaker-role {
  margin-bottom: 8px;
  color: var(--text);
  font-weight: 500;
}

.speaker-meta {
  display: grid;
  gap: 6px;
  margin-top: 16px;
  font-size: 0.92rem;
}

.speaker-meta a {
  color: var(--cyan);
  word-break: break-all;
}

.speaker-meta a:hover {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.avatar {
  display: grid;
  width: 72px;
  height: 72px;
  margin-bottom: 18px;
  place-items: center;
  border-radius: 16px;
  background: var(--card-strong);
  color: var(--gold);
  font-weight: 700;
  letter-spacing: 0.04em;
  object-fit: cover;
}

.avatar.photo {
  padding: 0;
  border: 1px solid var(--line);
}

.thanks-block,
.ack-block {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.thanks-lead {
  margin: 0 0 16px;
  color: var(--muted);
  max-width: 40rem;
}

.thanks-grid {
  margin-top: 8px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.featured-thanks {
  background: linear-gradient(135deg, rgba(198, 146, 20, 0.12), rgba(88, 213, 255, 0.06));
}

.ack-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  max-width: 44rem;
}

.ack-list li {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  color: var(--text);
}

.ack-list strong {
  color: var(--text);
  font-weight: 600;
}

.ack-note {
  color: var(--muted);
  font-size: 0.95rem;
}

.ack-mail {
  color: var(--cyan);
  font-size: 0.92rem;
  word-break: break-all;
}

.ack-mail:hover {
  color: var(--text);
}

@media (max-width: 900px) {
  .thanks-grid,
  .ack-list {
    grid-template-columns: 1fr;
  }
}

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

.resource-card {
  display: grid;
  gap: 28px;
  min-height: 160px;
}

.resource-card strong {
  color: var(--cyan);
}

.paper-block {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.paper-block h3 {
  margin: 0 0 16px;
}

.paper-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
  display: grid;
  gap: 12px;
}

.paper-list a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.paper-list a:hover {
  color: var(--text);
}

.footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 32px;
  max-width: 1180px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
  padding: 36px 24px 48px;
}

.contact-pi .contact-name {
  margin: 10px 0 6px;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 600;
}

.contact-pi .contact-title,
.contact-pi .contact-role {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 36rem;
}

.contact-pi .contact-role {
  color: var(--gold);
  font-weight: 600;
}

.footer a {
  display: inline-block;
  margin-top: 10px;
  color: var(--cyan);
  font-weight: 600;
}

.footer a:hover {
  color: var(--text);
}

.footer span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
}

.wechat-card {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: min(100%, 320px);
}

.wechat-card img {
  width: 148px;
  height: 148px;
  border-radius: 12px;
  background: #fff;
  padding: 8px;
  object-fit: contain;
}

.wechat-card strong {
  display: block;
  margin-bottom: 6px;
}

@media (max-width: 900px) {
  .hero,
  .overview-section,
  .split,
  .card-grid.four,
  .card-grid.speakers,
  .card-grid.two,
  .resource-list {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 72px;
  }

  .hero-visual {
    max-height: none;
  }

  .hero-image {
    max-height: none;
  }

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

  .nav-links {
    position: absolute;
    top: 68px;
    right: 24px;
    left: 24px;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 18px;
    background: rgba(7, 17, 31, 0.96);
  }

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

  .footer {
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .section {
    padding: 64px 18px;
  }

  .nav {
    padding: 14px 18px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

}