/* 次元集品牌黄主题：用黑色轮廓建立高对比，用奶油黄铺陈页面层次。 */
:root {
  --paper: #fffdf7;
  --yellow: #ffd52f;
  --yellow-deep: #f4b900;
  --yellow-soft: #fff0a6;
  --yellow-pale: #fffbed;
}

body {
  background:
    radial-gradient(circle at 8% 4%, rgba(255, 213, 47, 0.14), transparent 25rem),
    radial-gradient(circle at 92% 18%, rgba(255, 213, 47, 0.08), transparent 30rem),
    var(--paper);
}

.nav {
  background: rgba(255, 253, 242, 0.94);
  box-shadow: 0 7px 0 var(--ink), 0 18px 40px rgba(205, 153, 0, 0.11);
}

.nav.is-scrolled {
  background: rgba(255, 244, 181, 0.96);
}

.brand strong::after {
  content: "CIYUANJI";
  display: block;
  margin-top: 1px;
  color: #8d6b00;
  font-size: 7px;
  letter-spacing: 2px;
}

.hero {
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  width: 42vw;
  height: 42vw;
  max-width: 590px;
  max-height: 590px;
  right: -4%;
  top: 42%;
  transform: translateY(-50%);
  border-radius: 45% 55% 62% 38%;
  background: linear-gradient(145deg, #ffe46e, var(--yellow));
  box-shadow:
    0 0 0 22px rgba(255, 213, 47, 0.12),
    0 0 0 65px rgba(255, 213, 47, 0.06);
  animation: yellow-blob 10s ease-in-out infinite;
}

.eyebrow {
  border-color: rgba(23, 24, 22, 0.18);
  background: var(--yellow);
  box-shadow: 4px 4px 0 var(--ink);
}

.hero h1 em {
  color: var(--ink);
}

.hero-pills span {
  border-color: rgba(23, 24, 22, 0.2);
  background: rgba(255, 213, 47, 0.28);
}

.ticker {
  padding: 20px 0;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--yellow);
  color: var(--ink);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #8f6c00;
}

.kicker::before {
  content: "";
  width: 18px;
  height: 7px;
  border-radius: 99px;
  background: var(--yellow);
  box-shadow: 0 0 0 1px var(--ink);
}

#ecosystem {
  position: relative;
}

#ecosystem::before {
  content: "YELLOW IS OUR ENERGY";
  position: absolute;
  z-index: -1;
  right: 2%;
  top: 75px;
  color: rgba(184, 137, 0, 0.06);
  font-size: clamp(50px, 8vw, 128px);
  font-weight: 950;
  letter-spacing: -6px;
  white-space: nowrap;
}

.feature {
  background: linear-gradient(145deg, #ffe978, var(--yellow));
}

.feature.blue {
  background: linear-gradient(145deg, #fff5b9, #ffe67a);
}

.feature.pink {
  background: linear-gradient(145deg, #ffd954, #ffc91c);
}

.feature-icon {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: 4px 4px 0 var(--ink);
  font-size: 28px;
}

.stats {
  border: 2px solid var(--ink);
  border-radius: 28px;
  background: var(--yellow);
  box-shadow: 8px 9px 0 var(--ink);
  overflow: hidden;
}

.stats > div {
  padding: 32px;
  border-color: rgba(23, 24, 22, 0.3);
}

.stats strong {
  color: var(--ink);
  text-shadow: 3px 3px 0 rgba(255, 255, 255, 0.55);
}

.stats span {
  color: #5f4a00;
}

.universe {
  background:
    linear-gradient(115deg, rgba(255, 213, 47, 0.12), transparent 38%),
    var(--ink);
}

.universe::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  left: -70px;
  bottom: -80px;
  border: 40px solid var(--yellow);
  border-radius: 50%;
  opacity: 0.18;
}

.universe-stage {
  border-color: rgba(255, 213, 47, 0.5);
  background:
    radial-gradient(circle at 76% 48%, rgba(255, 213, 47, 0.26), transparent 38%),
    #20211e;
  box-shadow: 0 26px 80px rgba(0, 0, 0, 0.28);
}

.tag {
  border-color: rgba(255, 213, 47, 0.35);
  background: rgba(255, 213, 47, 0.08);
  color: #ffe780;
}

.journey,
.assurance {
  background:
    linear-gradient(135deg, rgba(255, 213, 47, 0.09), transparent 45%),
    #fffaf0;
}

.steps > div,
.assurance-grid article {
  border: 2px solid rgba(23, 24, 22, 0.65);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 4px 5px 0 rgba(23, 24, 22, 0.9);
}

.steps b {
  color: #b08300;
}

.community-topics span {
  border-color: rgba(23, 24, 22, 0.35);
  background: var(--yellow-soft);
}

.post-wall article:nth-child(2) {
  background: #ffea83;
}

.post-wall article:nth-child(3) {
  background: #ffd74a;
}

.assurance-grid article > div,
.assurance-grid article:nth-child(2) > div,
.assurance-grid article:nth-child(3) > div {
  background: var(--yellow);
}

.faq details {
  border-color: rgba(23, 24, 22, 0.25);
}

.faq details[open] {
  margin: 0 -20px;
  padding: 0 20px;
  border-radius: 16px;
  background: rgba(255, 213, 47, 0.18);
}

.download {
  border: 3px solid var(--ink);
  background:
    radial-gradient(circle at 90% 50%, rgba(255, 213, 47, 0.2), transparent 26%),
    linear-gradient(120deg, #11120f 0 62%, #2c250b 100%);
  box-shadow: 10px 11px 0 var(--yellow-deep);
}

.download .kicker,
.universe .kicker {
  color: var(--yellow);
}

.qr-card {
  border: 7px solid var(--yellow);
  box-shadow:
    0 0 0 2px var(--ink),
    0 20px 60px rgba(0, 0, 0, 0.36);
}

.cta {
  background:
    radial-gradient(circle at 92% 20%, rgba(255, 255, 255, 0.42), transparent 22%),
    linear-gradient(135deg, #ffe369, var(--yellow));
}

.primary {
  background: var(--yellow);
}

footer {
  position: relative;
  border-top: 12px solid var(--yellow);
}

footer::before {
  content: "";
  position: absolute;
  top: -20px;
  left: 0;
  width: 100%;
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--ink) 0 20px, var(--yellow) 20px 40px);
}

@keyframes yellow-blob {
  0%,
  100% {
    border-radius: 45% 55% 62% 38%;
    transform: translateY(-50%) rotate(0deg);
  }

  50% {
    border-radius: 58% 42% 38% 62%;
    transform: translateY(-52%) rotate(5deg);
  }
}

@media (max-width: 850px) {
  .hero::before {
    width: 520px;
    height: 520px;
    right: -180px;
    top: 68%;
  }

  .stats {
    margin-inline: 14px;
  }
}

@media (max-width: 560px) {
  .hero::before {
    width: 390px;
    height: 390px;
    right: -170px;
    top: 72%;
  }

  .stats > div {
    padding: 24px 20px;
  }

  .download {
    box-shadow: 6px 7px 0 var(--yellow-deep);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero::before {
    animation: none;
  }
}