:root {
  --ink: #14202a;
  --ink-soft: rgba(20, 32, 42, 0.78);
  --paper: #eef3f4;
  --mist: #d7e4e8;
  --sea: #6a8f9a;
  --amber-deep: #a56a28;
  --font-body:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "PingFang SC",
    "HarmonyOS Sans SC",
    "HarmonyOS Sans",
    "MiSans",
    "Noto Sans SC",
    "Hiragino Sans GB",
    "Microsoft YaHei UI",
    "Microsoft YaHei",
    sans-serif;
  --font-display:
    "PingFang SC",
    "HarmonyOS Sans SC",
    "HarmonyOS Sans",
    "MiSans",
    "Noto Sans SC",
    system-ui,
    -apple-system,
    sans-serif;
  --font-brand:
    "Songti SC",
    "STSong",
    "Noto Serif SC",
    "PingFang SC",
    "HarmonyOS Sans SC",
    "MiSans",
    serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --pad-x: clamp(2.5rem, 5vw, 4rem);
  --phone-max: 768px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.page {
  overflow-x: clip;
}

.top {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  padding: 1.25rem var(--pad-x);
  pointer-events: none;
}

.mark {
  pointer-events: auto;
  font-family: var(--font-brand);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.mark.is-visible {
  opacity: 0.9;
  transform: none;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: clamp(5rem, 12vh, 8rem) var(--pad-x) clamp(3rem, 8vh, 5rem);
}

.hero-media {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 58% 45%;
  transform: scale(1.06);
  filter: saturate(0.92) contrast(1.04);
  will-change: transform;
  animation: drift 18s var(--ease) both;
}

.hero-veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    rgba(238, 243, 244, 0.92) 0%,
    rgba(238, 243, 244, 0.78) 38%,
    rgba(238, 243, 244, 0.18) 68%,
    rgba(20, 32, 42, 0.22) 100%
  );
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 40rem;
}

.brand {
  margin: 0 0 1rem;
  font-family: var(--font-brand);
  font-size: clamp(5rem, 10vw, 7.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.12em;
  color: var(--ink);
  opacity: 0;
  transform: translateY(28px);
  animation: rise 1s var(--ease) 0.15s forwards;
}

.headline {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.45;
  opacity: 0;
  transform: translateY(22px);
  animation: rise 1s var(--ease) 0.35s forwards;
}

.headline span {
  display: inline;
}

.lede {
  margin: 0 0 1.75rem;
  max-width: 24rem;
  color: var(--ink-soft);
  font-size: 1.1rem;
  font-weight: 400;
  line-height: 1.7;
  opacity: 0;
  transform: translateY(18px);
  animation: rise 1s var(--ease) 0.5s forwards;
}

.cta-group {
  display: flex;
  opacity: 0;
  transform: translateY(16px);
  animation: rise 1s var(--ease) 0.65s forwards;
}

.cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.25rem 0;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--amber-deep);
}

.cta::after {
  content: "";
  display: block;
  width: 1.6rem;
  height: 2px;
  background: currentColor;
  transition: width 0.45s var(--ease);
}

.cta::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0.05rem;
  width: 100%;
  height: 2px;
  background: currentColor;
  transform: scaleX(0.3);
  transform-origin: left center;
  transition: transform 0.45s var(--ease);
}

.cta:active::before,
.cta:hover::before {
  transform: scaleX(1);
}

.cta:hover::after {
  width: 2.2rem;
}

.world {
  background:
    radial-gradient(120% 80% at 0% 0%, rgba(106, 143, 154, 0.14), transparent 55%),
    linear-gradient(180deg, var(--paper) 0%, var(--mist) 100%);
  padding: clamp(4.5rem, 12vh, 7rem) var(--pad-x);
}

.world-inner {
  max-width: 40rem;
}

.world-title {
  margin: 0 0 1.15rem;
  font-family: var(--font-brand);
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.25;
}

.world-text {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.1rem;
  font-weight: 400;
  line-height: 1.8;
}

.world-list {
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.85;
}

.world-list li {
  position: relative;
  padding-left: 1.15rem;
}

.world-list li + li {
  margin-top: 0.45rem;
}

.world-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 0.45rem;
  height: 2px;
  background: var(--amber-deep);
}

.foot {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem var(--pad-x) 2rem;
  background: var(--mist);
  color: var(--sea);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  line-height: 1.55;
}

.foot-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1.25rem;
}

.foot a {
  color: var(--ink-soft);
  font-weight: 500;
}

.foot a.beian {
  color: var(--sea);
  font-weight: 400;
}

.foot a.beian:hover,
.foot a.beian:focus-visible {
  color: var(--ink-soft);
}

@keyframes rise {
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes drift {
  from {
    transform: scale(1.06) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1) translate3d(-1.2%, 0.6%, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-image,
  .brand,
  .headline,
  .lede,
  .cta-group {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .mark {
    opacity: 0.9;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}

@media (max-width: 768px) {
  :root {
    --pad-x: 1.5rem;
  }

  body {
    font-size: 18px;
  }

  .mark {
    font-size: 1.35rem;
  }

  .hero {
    padding: 5.5rem var(--pad-x) 3.5rem;
  }

  .hero-image {
    object-position: 70% 40%;
  }

  .hero-veil {
    background: linear-gradient(
      180deg,
      rgba(238, 243, 244, 0.28) 0%,
      rgba(238, 243, 244, 0.52) 38%,
      rgba(238, 243, 244, 0.94) 72%,
      rgba(238, 243, 244, 0.99) 100%
    );
  }

  .brand {
    font-size: clamp(4.75rem, 22vw, 6rem);
    letter-spacing: 0.14em;
    margin-bottom: 1.1rem;
  }

  .headline {
    font-size: 1.85rem;
    line-height: 1.5;
    margin-bottom: 1.1rem;
  }

  .headline span {
    display: block;
  }

  .lede {
    max-width: none;
    font-size: 1.3rem;
    margin-bottom: 2.25rem;
  }

  .cta {
    min-height: 2.75rem;
    font-size: 1.3rem;
    padding: 0.35rem 0;
  }

  .cta::before {
    bottom: 0.15rem;
  }

  .world {
    padding: 4rem var(--pad-x) 4.5rem;
  }

  .world-title {
    font-size: 2.35rem;
  }

  .world-text,
  .world-list {
    font-size: 1.25rem;
    line-height: 1.9;
  }

  .foot {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
    padding: 1.75rem var(--pad-x) 2.5rem;
    font-size: 1.05rem;
  }

  .foot a {
    font-size: 1.1rem;
  }

  .foot a.beian {
    font-size: 1.05rem;
  }
}