:root {
  color-scheme: dark;
  --ink: #f7fbff;
  --muted: rgba(231, 242, 248, 0.68);
  --quiet: rgba(231, 242, 248, 0.46);
  --line: rgba(232, 247, 255, 0.18);
  --line-strong: rgba(232, 247, 255, 0.34);
  --blue: #61d7ee;
  --gold: #f4c36e;
  --black: #06090c;
  --panel: #0a1014;
  --max: 1200px;
  --gutter: clamp(20px, 5vw, 72px);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--black);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(180deg, #06090c 0%, #090f13 48%, #050708 100%);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-color: rgba(97, 215, 238, 0.54);
  text-underline-offset: 0.28em;
}

a:hover {
  color: var(--blue);
}

.site-shell {
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px) 0 0 / 16.666% 100%,
    linear-gradient(180deg, transparent 0%, rgba(97, 215, 238, 0.035) 50%, transparent 100%);
}

.site-header {
  position: fixed;
  z-index: 10;
  inset: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 24px;
  padding: 24px var(--gutter);
  color: rgba(247, 251, 255, 0.9);
  background: linear-gradient(180deg, rgba(6, 9, 12, 0.78), rgba(6, 9, 12, 0));
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  width: 18px;
  height: 18px;
  border: 1px solid var(--line-strong);
  border-left-color: var(--blue);
  border-bottom-color: var(--gold);
  transform: rotate(45deg);
}

.poster-hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: 128px var(--gutter) 76px;
  isolation: isolate;
}

.poster-media,
.poster-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.poster-media {
  z-index: -3;
  background-image: url("../images/zhipu-cloud-poster.png");
  background-size: cover;
  background-position: 61% center;
  transform: translate3d(var(--drift-x, 0), var(--drift-y, 0), 0) scale(1.035);
  transition: transform 240ms ease-out;
}

.poster-overlay {
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(6, 9, 12, 0.98) 0%, rgba(6, 9, 12, 0.88) 26%, rgba(6, 9, 12, 0.34) 60%, rgba(6, 9, 12, 0.24) 100%),
    linear-gradient(180deg, rgba(6, 9, 12, 0.26) 0%, rgba(6, 9, 12, 0.02) 40%, rgba(6, 9, 12, 0.92) 100%),
    radial-gradient(circle at 32% 42%, rgba(97, 215, 238, 0.16), transparent 32%);
}

.poster-hero::before,
.poster-hero::after {
  content: "";
  position: absolute;
  inset: auto var(--gutter) 54px;
  height: 1px;
  background: linear-gradient(90deg, var(--line-strong), transparent);
  z-index: -1;
}

.poster-hero::after {
  inset: 114px var(--gutter) auto;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
}

.hero-copy {
  width: min(720px, 100%);
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--gold);
  font-size: 12px;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

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

h1 {
  margin-bottom: 28px;
  font-size: clamp(58px, 10vw, 138px);
  line-height: 0.94;
  font-weight: 600;
  letter-spacing: 0;
}

.hero-statement {
  max-width: 650px;
  margin-bottom: 0;
  color: rgba(247, 251, 255, 0.82);
  font-size: clamp(20px, 2.3vw, 34px);
  line-height: 1.35;
  font-weight: 400;
}

.hero-index {
  position: absolute;
  right: var(--gutter);
  bottom: 110px;
  display: grid;
  gap: 14px;
  width: min(260px, 28vw);
  color: rgba(247, 251, 255, 0.7);
}

.filing-link {
  position: absolute;
  right: var(--gutter);
  bottom: 44px;
  z-index: 1;
  padding-top: 12px;
  border-top: 1px solid var(--line-strong);
  color: rgba(247, 251, 255, 0.82);
  font-size: 14px;
  line-height: 1.4;
}

.hero-index p {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.hero-index span {
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 860px) {
  .site-header {
    padding-top: 20px;
  }

  .poster-hero {
    min-height: 100svh;
    padding-top: 108px;
    padding-bottom: 42px;
  }

  .poster-media {
    background-position: 66% center;
  }

  .poster-overlay {
    background:
      linear-gradient(90deg, rgba(6, 9, 12, 0.98) 0%, rgba(6, 9, 12, 0.84) 47%, rgba(6, 9, 12, 0.42) 100%),
      linear-gradient(180deg, rgba(6, 9, 12, 0.44) 0%, rgba(6, 9, 12, 0.05) 42%, rgba(6, 9, 12, 0.96) 100%);
  }

  .hero-index {
    position: static;
    width: 100%;
    margin-top: 34px;
    margin-bottom: 58px;
  }

  .filing-link {
    left: var(--gutter);
    right: var(--gutter);
    bottom: 24px;
  }
}

@media (max-width: 520px) {
  :root {
    --gutter: 18px;
  }

  .brand-lockup {
    font-size: 14px;
  }

  h1 {
    font-size: clamp(54px, 18vw, 78px);
  }

  .hero-statement {
    font-size: 19px;
  }

}

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

  .poster-media {
    transition: none;
    transform: scale(1.035);
  }
}