:root {
  --paper: #f9f8f6;
  --paper-deep: #f0ede8;
  --ink: #1a1a1a;
  --body: #4a4a4a;
  --muted: #77736e;
  --burgundy: #7a2228;
  --gold: #c5a059;
  --line: rgba(26, 26, 26, .12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

a {
  color: #996117;
  text-decoration: none;
  font-weight: 700;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.join-hero {
  min-height: 100svh;
  display: grid;
  align-items: center;
  padding: 72px max(24px, calc((100% - 1320px) / 2));
  background:
    radial-gradient(circle at 82% 18%, rgba(197, 160, 89, .12), transparent 28%),
    #f5f0e7;
}

.hero-inner {
  width: min(1320px, 100%);
  margin: 0 auto;
}

.kicker {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 58px;
  color: #8b5a18;
  font-size: 14px;
  font-weight: 800;
}

.kicker::before {
  content: "";
  width: 46px;
  height: 1px;
  background: currentColor;
}

h1 {
  max-width: 1180px;
  margin: 26px 0 0;
  font-size: clamp(64px, 7.8vw, 112px);
  line-height: 1.12;
  font-weight: 900;
}

h1 strong {
  color: #9c1d1f;
  font-weight: inherit;
}

.scroll-cue {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  margin-top: 54px;
  color: var(--ink);
  font-size: 13px;
}

.scroll-cue i {
  position: relative;
  display: block;
  width: 72px;
  height: 1px;
  overflow: hidden;
  background: rgba(44, 44, 44, .2);
}

.scroll-cue i::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--burgundy);
  transform: translateX(-100%);
  animation: cue-line 2.4s ease-in-out infinite;
}

@keyframes cue-line {
  0%, 20% { transform: translateX(-100%); }
  60%, 100% { transform: translateX(100%); }
}

.data-story {
  position: relative;
  overflow: clip;
  background:
    radial-gradient(circle at 9% 15%, rgba(197, 160, 89, .11), transparent 24%),
    radial-gradient(circle at 84% 48%, rgba(122, 34, 40, .055), transparent 33%),
    var(--paper);
  border-top: 1px solid var(--line);
}

.story-shell {
  width: min(1540px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(450px, .84fr) minmax(0, 1.16fr);
}

.narrative-column {
  position: relative;
  z-index: 2;
  padding-left: clamp(28px, 4.2vw, 76px);
}

.data-stage {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 80px 34px 80px 0;
}

.data-panel {
  width: min(620px, 100%);
  padding: 12px 0;
  outline: 0;
  transform: translateY(34px);
  opacity: .3;
  transition: opacity .55s ease, transform .55s ease;
}

.data-stage.is-active .data-panel,
.data-panel:focus-visible {
  opacity: 1;
  transform: translateY(0);
}

.panel-topline {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
  padding-bottom: 18px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 11px;
  letter-spacing: .08em;
}

.panel-topline span:first-child {
  color: var(--gold);
  font-size: 22px;
  font-weight: 700;
}

.data-label {
  margin: 38px 0 12px;
  color: var(--burgundy);
  font-size: 14px;
  font-weight: 800;
}

.data-panel h3 {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 2.35vw, 42px);
  line-height: 1.08;
}

.data-panel h3 strong {
  display: inline-block;
  color: var(--burgundy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(68px, 6.3vw, 104px);
  font-weight: 700;
  line-height: 1;
}

.data-highlight {
  max-width: 550px;
  margin: 24px 0 30px;
  padding-left: 18px;
  color: #302d29;
  border-left: 2px solid var(--gold);
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.8;
}

.data-points {
  margin: 0;
}

.data-points div {
  display: grid;
  grid-template-columns: 94px minmax(0, 1fr);
  gap: 18px;
  padding: 15px 0;
  border-top: 1px solid var(--line);
}

.data-points div:last-child {
  border-bottom: 1px solid var(--line);
}

.data-points dt {
  color: var(--burgundy);
  font-size: 13px;
  font-weight: 800;
}

.data-points dd {
  margin: 0;
  color: var(--body);
  font-size: 14px;
  line-height: 1.85;
}

.visual-column {
  position: relative;
  min-width: 0;
}

.visual-sticky {
  position: sticky;
  top: 0;
  height: 100svh;
  min-height: 620px;
  overflow: hidden;
  isolation: isolate;
}

.visual-sticky::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(112deg, transparent 11%, rgba(255, 255, 255, .8) 43%, transparent 67%),
    linear-gradient(180deg, rgba(197, 160, 89, .035), transparent 42%, rgba(122, 34, 40, .025));
  filter: blur(10px);
  opacity: .85;
  pointer-events: none;
}

.visual-sticky::after {
  content: "";
  position: absolute;
  z-index: 0;
  inset: -28% -45%;
  background: repeating-linear-gradient(
    106deg,
    transparent 0,
    transparent 94px,
    rgba(197, 160, 89, .055) 95px,
    transparent 97px
  );
  transform: translate3d(-8%, 0, 0);
  animation: particle-light-pass 8s linear infinite;
  pointer-events: none;
}

#data-canvas {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: pan-y;
  filter: saturate(1.08) contrast(1.025);
}

@keyframes particle-light-pass {
  from { transform: translate3d(-8%, 0, 0); }
  to { transform: translate3d(8%, 0, 0); }
}

.canvas-fallback {
  position: absolute;
  inset: 22%;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 10px;
  color: rgba(122, 34, 40, .28);
  border: 1px solid var(--line);
  font-family: Georgia, "Times New Roman", serif;
  pointer-events: none;
}

.canvas-fallback strong {
  font-size: 84px;
}

.canvas-fallback span {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .12em;
}

.webgl-ready .canvas-fallback {
  display: none;
}

.visual-status {
  position: absolute;
  z-index: 2;
  right: 48px;
  bottom: 40px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  pointer-events: none;
}

.stage-number {
  color: var(--burgundy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 34px;
  font-weight: 700;
}

.stage-name {
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .08em;
}

.particle-hint {
  position: absolute;
  z-index: 2;
  right: 48px;
  top: 42px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(74, 74, 74, .58);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 9px;
  letter-spacing: .12em;
  pointer-events: none;
}

.particle-hint i {
  width: 26px;
  height: 26px;
  border: 1px solid rgba(122, 34, 40, .32);
  border-radius: 50%;
  box-shadow: inset 0 0 0 7px rgba(197, 160, 89, .08);
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 34px max(24px, calc((100% - 1320px) / 2));
  color: rgba(255, 255, 255, .62);
  background: var(--ink);
  font-size: 12px;
}

footer a {
  color: #e6c886;
}

@media (max-width: 1080px) {
  .story-shell {
    grid-template-columns: minmax(410px, .9fr) minmax(0, 1.1fr);
  }

  .data-points div {
    grid-template-columns: 80px minmax(0, 1fr);
  }
}

@media (max-width: 820px) {
  .join-hero {
    padding: 52px 24px;
  }

  h1 {
    font-size: 62px;
    line-height: 1.16;
  }

  .story-shell {
    display: flex;
    flex-direction: column;
  }

  .visual-column {
    position: sticky;
    top: 0;
    z-index: 1;
    order: -1;
    height: 43svh;
    min-height: 330px;
    background: rgba(249, 248, 246, .92);
  }

  .visual-sticky {
    position: relative;
    height: 100%;
    min-height: 0;
  }

  .narrative-column {
    z-index: 2;
    padding: 0 20px;
  }

  .data-stage {
    min-height: 88svh;
    align-items: end;
    padding: 40svh 0 7svh;
  }

  .data-panel {
    margin: 0 auto;
    padding: 26px;
    background: rgba(255, 255, 255, .88);
    border: 1px solid rgba(197, 160, 89, .2);
    box-shadow: 0 22px 58px rgba(0, 0, 0, .05);
    backdrop-filter: blur(18px);
  }

  .data-label {
    margin-top: 26px;
  }

  .data-panel h3 {
    font-size: 28px;
  }

  .data-panel h3 strong {
    font-size: 58px;
  }

  .data-highlight {
    margin: 18px 0 24px;
    font-size: 16px;
  }

  .data-points div {
    grid-template-columns: 74px minmax(0, 1fr);
    gap: 12px;
    padding: 12px 0;
  }

  .data-points dd {
    font-size: 13px;
  }

  .visual-status {
    right: 20px;
    bottom: 18px;
  }

  .particle-hint {
    right: 20px;
    top: 18px;
  }
}

@media (max-width: 520px) {
  .kicker {
    margin-top: 42px;
  }

  h1 {
    font-size: 46px;
  }

  .scroll-cue {
    margin-top: 38px;
  }

  .visual-column {
    height: 40svh;
  }

  .data-stage {
    min-height: 92svh;
    padding-top: 37svh;
  }

  .data-panel {
    padding: 22px;
  }

  .data-points div {
    display: block;
  }

  .data-points dd {
    margin-top: 5px;
  }

  footer {
    flex-direction: column;
  }
}

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

  .scroll-cue i::after {
    animation: none;
  }

  .visual-sticky::after {
    animation: none;
  }

  .data-panel {
    transition: none;
  }
}