:root {
  --bg: #efe7d4;
  --bg-soft: #f7f2e7;
  --surface: rgba(255, 252, 246, 0.72);
  --surface-strong: #fffaf2;
  --ink: #17352b;
  --ink-soft: #4f655d;
  --line: rgba(23, 53, 43, 0.12);
  --brand: #b44f2c;
  --brand-deep: #8f3d23;
  --sea: #1e5a56;
  --sea-soft: rgba(30, 90, 86, 0.14);
  --sand: #d9b77d;
  --shadow: 0 22px 60px rgba(53, 40, 24, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --font-display: 'Iowan Old Style', 'Palatino Linotype', 'Noto Serif SC', serif;
  --font-body: 'Avenir Next', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(180, 79, 44, 0.18), transparent 32%),
    radial-gradient(circle at 85% 18%, rgba(30, 90, 86, 0.16), transparent 26%),
    linear-gradient(180deg, #f4ecdb 0%, #efe7d4 42%, #f8f2e7 100%);
  line-height: 1.6;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.14) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.26;
  pointer-events: none;
}

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

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

.page-shell {
  position: relative;
  width: min(1120px, calc(100% - 24px));
  margin: 12px auto 0;
  padding-bottom: 92px;
}

.site-header {
  position: sticky;
  top: 12px;
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 14px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 248, 238, 0.86);
  backdrop-filter: blur(18px);
  box-shadow: 0 12px 40px rgba(55, 39, 20, 0.08);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark__glyph {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--brand), #cb8251);
  color: #fff9f1;
  font-family: var(--font-display);
  font-size: 1.25rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.brand-mark__copy {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-mark__copy strong {
  font-size: 1rem;
}

.brand-mark__copy small {
  color: var(--ink-soft);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.94rem;
}

.site-nav a {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid rgba(23, 53, 43, 0.08);
}

.section {
  padding: 28px 18px;
  margin-bottom: 16px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.section--light {
  background: rgba(255, 250, 242, 0.86);
}

.section--accent {
  background:
    radial-gradient(circle at top right, rgba(217, 183, 125, 0.18), transparent 22%),
    linear-gradient(180deg, rgba(30, 90, 86, 0.08), rgba(255, 250, 242, 0.94));
}

.hero {
  display: grid;
  gap: 22px;
  padding-top: 30px;
}

.hero__content h1,
.section-heading h2,
.join-panel h2 {
  margin: 0;
  font-family: var(--font-display);
  letter-spacing: -0.03em;
}

.hero__content h1 {
  font-size: clamp(2.4rem, 8vw, 4.6rem);
  line-height: 1.02;
  max-width: 10ch;
}

.hero__lede,
.copy-block p,
.host-card__body p,
.join-panel p,
.faq-list p,
.boundary-card p,
.audience-card p,
.info-card p,
.process-step p {
  color: var(--ink-soft);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--brand-deep);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

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

.button--primary {
  color: #fffaf2;
  background: linear-gradient(135deg, var(--brand), #cb8251);
  box-shadow: 0 14px 28px rgba(180, 79, 44, 0.22);
}

.button--ghost {
  border-color: rgba(23, 53, 43, 0.12);
  background: rgba(255, 255, 255, 0.72);
}

.hero__signals {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.hero__signals li {
  position: relative;
  padding-left: 18px;
}

.hero__signals li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--sea);
}

.hero__panel,
.stacked-cards,
.join-panel__actions,
.boundary-grid,
.audience-grid,
.faq-list {
  display: grid;
  gap: 14px;
}

.hero-card,
.info-card,
.audience-card,
.boundary-card,
.contact-card,
.host-card,
.process-step {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(23, 53, 43, 0.1);
}

.hero-card {
  padding: 20px;
  background: rgba(255, 250, 242, 0.88);
}

.hero-card--sunrise {
  background:
    radial-gradient(circle at top right, rgba(217, 183, 125, 0.3), transparent 28%),
    linear-gradient(180deg, rgba(180, 79, 44, 0.1), rgba(255, 250, 242, 0.92));
}

.hero-card__label,
.contact-card__label {
  margin: 0 0 10px;
  color: var(--brand-deep);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  line-height: 1.1;
}

.hero-card--grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  background: linear-gradient(140deg, rgba(30, 90, 86, 0.9), rgba(23, 53, 43, 0.94));
  color: #eef5ee;
}

.hero-card--grid div {
  padding: 12px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.08);
}

.hero-card--grid span {
  display: block;
  margin-bottom: 6px;
  color: rgba(238, 245, 238, 0.7);
  font-size: 0.8rem;
}

.hero-card--grid strong {
  font-size: 1rem;
}

.section-heading {
  margin-bottom: 18px;
}

.section-heading h2,
.join-panel h2 {
  font-size: clamp(1.8rem, 5vw, 3rem);
  line-height: 1.08;
}

.two-column,
.join-panel {
  display: grid;
  gap: 18px;
}

.copy-block {
  display: grid;
  gap: 14px;
  font-size: 1.02rem;
}

.copy-block p,
.host-card__body p,
.join-panel p {
  margin: 0;
}

.info-card,
.audience-card,
.boundary-card,
.contact-card {
  padding: 18px;
  background: rgba(255, 255, 255, 0.68);
}

.info-card span,
.process-step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: var(--sea-soft);
  color: var(--sea);
  font-weight: 700;
}

.info-card h3,
.audience-card h3,
.boundary-card h3,
.process-step h3,
.host-card__intro {
  margin: 0 0 8px;
  font-size: 1.12rem;
}

.audience-card--muted {
  background: rgba(23, 53, 43, 0.05);
}

.process-list {
  display: grid;
  gap: 12px;
}

.process-step {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 14px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.62);
}

.process-step span {
  margin: 0;
}

.process-step h3,
.process-step p {
  margin: 0;
}
.contact-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
}

.host-card {
  display: grid;
  gap: 16px;
  padding: 18px;
  background:
    radial-gradient(circle at 18% 14%, rgba(217, 183, 125, 0.22), transparent 16%),
    rgba(255, 252, 247, 0.82);
}

.join-panel {
  padding: 2px;
  border-radius: calc(var(--radius-xl) - 4px);
}

.join-panel__copy {
  display: grid;
  gap: 12px;
}

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

.faq-list details {
  padding: 16px 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(23, 53, 43, 0.08);
}

.faq-list summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list details[open] summary {
  margin-bottom: 10px;
}

.mobile-cta {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 30;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 56px;
  border-radius: 20px;
  color: #fffaf2;
  font-weight: 800;
  background: linear-gradient(135deg, var(--sea), #23776d);
  box-shadow: 0 18px 40px rgba(30, 90, 86, 0.28);
}

html.js-enhanced .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 520ms ease,
    transform 520ms ease;
}

html.js-enhanced .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 720px) {
  .page-shell {
    width: min(1180px, calc(100% - 32px));
    margin-top: 16px;
  }

  .site-header {
    top: 16px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 16px 18px;
  }

  .hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
    align-items: stretch;
    padding: 40px 28px;
  }

  .section {
    padding: 34px 28px;
    margin-bottom: 18px;
  }

  .two-column,
  .join-panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .host-card {
    grid-template-columns: 120px 1fr;
    align-items: center;
    padding: 24px;
  }
}

@media (min-width: 980px) {
  .audience-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .mobile-cta {
    display: none;
  }
}

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

  .button,
  .reveal {
    transition: none;
  }

  html.js-enhanced .reveal {
    opacity: 1;
    transform: none;
  }
}

.official-contacts__email {
  display: inline-flex;
  margin-top: 14px;
  color: #b95936;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.official-contact-card {
  display: grid;
  gap: 7px;
  align-content: start;
  padding: 12px;
  border: 1px solid rgba(29, 78, 69, 0.12);
  border-radius: 16px;
  color: inherit;
  background: #fffdf8;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}
.official-contact-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(29, 78, 69, 0.11);
}
.official-contact-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  border-radius: 10px;
  background: #f5f0e6;
}
.official-contact-card span {
  color: #1d4e45;
  font-weight: 700;
  font-size: 0.92rem;
}
.official-contact-card small {
  color: #6c7069;
  font-size: 0.78rem;
}
.official-contact-card--primary {
  border-color: #b95936;
  background: #fff7ee;
}
.litanzhang-photo {
  width: 96px;
  height: 96px;
  flex: 0 0 96px;
  border-radius: 18px;
  object-fit: cover;
  object-position: center;
  box-shadow: 0 8px 18px rgba(29, 78, 69, 0.16);
}
.qr-channel-panel {
  display: grid;
  gap: 16px;
  margin-top: 26px;
  padding: 18px;
  border: 1px solid rgba(29, 78, 69, 0.12);
  border-radius: 18px;
  background: rgba(255, 253, 248, 0.72);
}
.qr-channel-panel__copy h3 {
  margin: 4px 0 8px;
  color: #1d4e45;
  font-size: 1.2rem;
}
.qr-channel-panel__copy p {
  margin: 0;
  line-height: 1.7;
}
.qr-channel-panel__primary {
  width: min(100%, 176px);
}
.qr-channel-panel__more {
  border-top: 1px solid rgba(29, 78, 69, 0.12);
  padding-top: 13px;
}
.qr-channel-panel__more summary {
  cursor: pointer;
  color: #1d4e45;
  font-weight: 700;
}
.qr-channel-panel__secondary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding-top: 14px;
}
.qr-channel-panel .official-contact-card {
  padding: 10px;
}
.qr-channel-panel--join {
  grid-column: 1 / -1;
  width: 100%;
  border-color: rgba(185, 89, 54, 0.24);
  background: linear-gradient(135deg, rgba(255, 247, 238, 0.96), rgba(255, 253, 248, 0.9));
}
.qr-channel-panel--join .qr-channel-panel__copy {
  align-self: center;
}
.qr-channel-panel--join .official-contacts__email {
  display: inline;
  margin: 0;
}
@media (min-width: 700px) {
  .qr-channel-panel {
    grid-template-columns: minmax(0, 1fr) 176px;
    align-items: center;
    padding: 22px;
  }
  .qr-channel-panel__more {
    grid-column: 1 / -1;
  }
}