.project-top-nav {
  position: fixed;
  z-index: 1000;
  top: 24px;
  left: 50%;
  display: grid;
  width: min(1180px, calc(100vw - 48px));
  min-height: 56px;
  grid-template-columns: minmax(150px, 1fr) auto minmax(116px, 1fr);
  align-items: center;
  padding: 8px 20px;
  border: 1px solid rgba(45, 40, 36, 0.14);
  border-radius: 999px;
  background: rgba(255, 251, 247, 0.9);
  color: #343130;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  box-sizing: border-box;
  backdrop-filter: blur(18px) saturate(1.08);
  -webkit-backdrop-filter: blur(18px) saturate(1.08);
  transform: translateX(-50%);
}

.project-top-nav[data-project="color-call"] {
  --project-accent: #19aaf2;
}

.project-top-nav[data-project="kugou"] {
  --project-accent: #00afd8;
}

.project-top-nav[data-project="moguding"] {
  --project-accent: #ff7900;
}

.project-top-nav[data-project="miaoxiaotian"] {
  --project-accent: #ff9fb2;
}

.project-top-nav[data-project="beyond-design"] {
  --project-accent: #f45cb3;
}

.project-top-nav a {
  color: inherit;
  text-decoration: none;
}

.project-top-nav__back {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: color 180ms ease;
}

.project-top-nav__back:hover,
.project-top-nav__back:focus-visible {
  color: var(--project-accent);
}

.project-top-nav__back span:first-child {
  transition: transform 180ms ease;
}

.project-top-nav__back:hover span:first-child,
.project-top-nav__back:focus-visible span:first-child {
  transform: translateX(-3px);
}

.project-top-nav__links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 0 8px;
}

.project-top-nav__links a {
  position: relative;
  z-index: 1;
  display: grid;
  min-width: 54px;
  min-height: 34px;
  place-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  transform-origin: center bottom;
  transition: background-color 180ms ease, color 180ms ease;
}

.project-top-nav__links a:hover,
.project-top-nav__links a:focus-visible {
  z-index: 2;
  background: color-mix(in srgb, var(--project-accent) 12%, transparent);
  color: var(--project-accent);
}

.project-top-nav__links a[data-active="true"] {
  z-index: 2;
  color: #fff;
  background: var(--project-accent);
}

.project-top-nav__index {
  justify-self: end;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

.project-pager {
  position: relative;
  z-index: 10;
  display: grid;
  width: min(860px, calc(100vw - 48px));
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 40px auto 52px;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.project-pager__item {
  display: flex;
  min-height: 62px;
  align-items: center;
  gap: 11px;
  padding: 10px 14px;
  border: 1px solid rgba(45, 40, 36, 0.12);
  border-radius: 999px;
  background: rgba(255, 251, 247, 0.76);
  color: rgba(52, 49, 48, 0.82);
  text-decoration: none;
  box-sizing: border-box;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 180ms ease, background-color 180ms ease;
}

.project-pager__item:hover,
.project-pager__item:focus-visible {
  border-color: rgba(45, 40, 36, 0.3);
  background: rgba(255, 253, 251, 0.92);
}

.project-pager__item--next {
  justify-content: flex-end;
  text-align: right;
}

.project-pager__copy {
  display: grid;
  gap: 2px;
}

.project-pager__copy small {
  color: rgba(93, 87, 83, 0.56);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.04em;
}

.project-pager__copy strong {
  font-size: clamp(13px, 1.15vw, 16px);
  font-weight: 500;
}

.project-pager__arrow {
  display: grid;
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid rgba(45, 40, 36, 0.12);
  border-radius: 50%;
  font-size: 13px;
  transition: transform 180ms ease;
}

.project-pager__item--previous:hover .project-pager__arrow,
.project-pager__item--previous:focus-visible .project-pager__arrow {
  transform: translateX(-3px);
}

.project-pager__item--next:hover .project-pager__arrow,
.project-pager__item--next:focus-visible .project-pager__arrow {
  transform: translateX(3px);
}

@media (max-width: 820px) {
  .project-top-nav {
    top: 16px;
    width: calc(100vw - 28px);
    grid-template-columns: auto 1fr auto;
    padding: 7px 14px;
  }

  .project-top-nav__back span:last-child {
    display: none;
  }

  .project-top-nav__links {
    gap: 0;
  }

  .project-top-nav__links a {
    padding: 8px 9px;
    font-size: 12px;
  }

  .project-top-nav__links a:nth-child(n + 5) {
    display: none;
  }

  .project-pager {
    width: calc(100vw - 28px);
    max-width: 720px;
    gap: 8px;
    margin: 32px auto 40px;
  }

  .project-pager__item {
    min-height: 58px;
    gap: 9px;
    padding: 9px 12px;
    border-radius: 999px;
  }

  .project-pager__arrow {
    width: 26px;
    height: 26px;
  }
}

@media (max-width: 560px) {
  .project-top-nav__links {
    display: none;
  }

  .project-top-nav {
    grid-template-columns: 1fr auto;
  }

  .project-pager__copy small {
    display: none;
  }

  .project-pager__copy strong {
    font-size: 12px;
  }

  .project-pager__item {
    min-height: 52px;
    padding: 8px 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .project-top-nav *,
  .project-pager * {
    transition: none !important;
  }
}