:root {
  --ink: #f5efe4;
  --muted: rgba(245, 239, 228, .62);
  --dark: #0d0d0c;
  --dark-soft: #171512;
  --line: rgba(245, 239, 228, .18);
  --gold: #d09a40;
  --serif: Forum, Georgia, "Times New Roman", "Songti SC", serif;
  --sans: "Avenir Next", Montserrat, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(.2, .8, .2, 1);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--dark);
  font-family: var(--sans);
  letter-spacing: 0;
}

body[data-lang="cn"] .lang-en,
body[data-lang="en"] .lang-cn {
  display: none !important;
}

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

button {
  font: inherit;
}

.case-nav {
  position: fixed;
  z-index: 50;
  top: 0;
  right: 0;
  left: 0;
  min-height: 86px;
  padding: 0 clamp(18px, 4vw, 64px);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  border-bottom: 1px solid rgba(245, 239, 228, .1);
  background: rgba(13, 13, 12, .78);
  backdrop-filter: blur(20px);
}

.case-nav-back,
.case-nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  letter-spacing: .08em;
}

.case-nav-actions {
  justify-content: flex-end;
}

.case-logo {
  font-family: var(--serif);
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1;
  white-space: nowrap;
}

.case-lang-toggle {
  padding: 8px;
  border: 0;
  color: rgba(245, 239, 228, .72);
  background: transparent;
  cursor: pointer;
}

.case-hero {
  position: relative;
  min-height: 88svh;
  padding: 150px clamp(22px, 6vw, 92px) clamp(56px, 7vw, 88px);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  isolation: isolate;
  background:
    linear-gradient(rgba(245, 239, 228, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 239, 228, .045) 1px, transparent 1px),
    #171512;
  background-size: 72px 72px;
}

.case-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 20px;
  border: 1px solid rgba(245, 239, 228, .09);
}

.case-hero-index {
  position: absolute;
  z-index: -1;
  right: clamp(18px, 5vw, 76px);
  top: 50%;
  transform: translateY(-50%);
  color: rgba(245, 239, 228, .055);
  font-family: var(--serif);
  font-size: clamp(190px, 34vw, 520px);
  line-height: .75;
}

.case-hero-copy {
  width: min(1050px, 100%);
}

.case-eyebrow {
  margin: 0 0 18px;
  color: var(--gold);
  font-size: 12px;
  letter-spacing: .24em;
  text-transform: uppercase;
}

.case-title {
  max-width: 1000px;
  margin: 0 0 28px;
  font-family: var(--serif);
  font-size: clamp(58px, 9vw, 130px);
  font-weight: 400;
  line-height: .98;
}

.case-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 34px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: rgba(245, 239, 228, .72);
  font-size: clamp(14px, 1.4vw, 18px);
}

.case-section {
  padding: clamp(78px, 9vw, 132px) clamp(18px, 5vw, 78px);
}

.case-section-inner {
  width: min(1480px, 100%);
  margin: 0 auto;
}

.case-section-label {
  margin: 0 0 16px;
  color: var(--gold);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
}

.case-section-title {
  margin: 0 0 34px;
  font-family: var(--serif);
  font-size: clamp(38px, 5vw, 72px);
  font-weight: 400;
  line-height: 1.05;
}

.case-video-placeholder {
  position: relative;
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(rgba(245, 239, 228, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 239, 228, .04) 1px, transparent 1px),
    #12110f;
  background-size: 64px 64px;
}

.case-video-placeholder::before {
  content: "";
  position: absolute;
  inset: 18px;
  border: 1px solid rgba(245, 239, 228, .08);
}

.case-video-play {
  position: relative;
  width: 82px;
  height: 82px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(245, 239, 228, .42);
  border-radius: 50%;
  color: var(--ink);
  font-size: 24px;
}

.case-video-label {
  position: absolute;
  right: 24px;
  bottom: 22px;
  color: rgba(245, 239, 228, .46);
  font-size: 11px;
  letter-spacing: .18em;
}

.case-story {
  display: grid;
  grid-template-columns: minmax(260px, .55fr) minmax(0, 1.45fr);
  gap: clamp(38px, 8vw, 130px);
  border-top: 1px solid var(--line);
}

.case-story-copy {
  max-width: 820px;
  color: var(--muted);
  font-size: clamp(17px, 1.7vw, 23px);
  line-height: 1.85;
}

.case-story-copy p {
  margin: 0;
}

.case-gallery {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(10px, 1.4vw, 20px);
}

.gallery-placeholder {
  position: relative;
  min-height: 280px;
  display: flex;
  align-items: flex-end;
  padding: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(rgba(245, 239, 228, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 239, 228, .04) 1px, transparent 1px),
    #181613;
  background-size: 42px 42px;
  color: rgba(245, 239, 228, .46);
  font-family: var(--serif);
  font-size: 18px;
}

.gallery-placeholder::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(245, 239, 228, .06);
}

.gallery-placeholder > span {
  position: relative;
}

.gallery-placeholder.is-wide {
  grid-column: span 8;
  min-height: 520px;
}

.gallery-placeholder.is-tall {
  grid-column: span 4;
  min-height: 520px;
}

.gallery-placeholder.is-half {
  grid-column: span 6;
  min-height: 390px;
}

.gallery-placeholder.is-third {
  grid-column: span 4;
  min-height: 330px;
}

.case-project-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.case-project-link {
  min-height: 210px;
  padding: clamp(26px, 4vw, 56px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: color .25s var(--ease), background .25s var(--ease);
}

.case-project-link + .case-project-link {
  border-left: 1px solid var(--line);
  text-align: right;
}

.case-project-link:hover {
  color: var(--gold);
  background: rgba(245, 239, 228, .025);
}

.case-project-direction {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.case-project-name {
  font-family: var(--serif);
  font-size: clamp(26px, 3vw, 44px);
  line-height: 1.2;
}

.case-footer {
  padding: 36px clamp(18px, 5vw, 78px);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: rgba(245, 239, 228, .48);
  font-size: 12px;
}

@media (max-width: 800px) {
  .case-nav {
    min-height: 72px;
    grid-template-columns: 1fr auto;
  }

  .case-nav-back {
    display: none;
  }

  .case-logo {
    justify-self: start;
  }

  .case-hero {
    min-height: 80svh;
    padding-top: 120px;
  }

  .case-story {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .case-gallery {
    grid-template-columns: 1fr;
  }

  .gallery-placeholder.is-wide,
  .gallery-placeholder.is-tall,
  .gallery-placeholder.is-half,
  .gallery-placeholder.is-third {
    grid-column: auto;
    min-height: 0;
    aspect-ratio: 4 / 3;
  }

  .gallery-placeholder.is-tall {
    aspect-ratio: 3 / 4;
  }

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

  .case-project-link + .case-project-link {
    border-top: 1px solid var(--line);
    border-left: 0;
  }
}

@media (max-width: 520px) {
  .case-nav {
    padding: 0 14px;
  }

  .case-nav-actions > a {
    display: none;
  }

  .case-hero {
    padding-right: 18px;
    padding-left: 18px;
  }

  .case-hero::before {
    inset: 10px;
  }

  .case-section {
    padding-right: 14px;
    padding-left: 14px;
  }

  .case-video-placeholder::before {
    inset: 9px;
  }

  .case-video-play {
    width: 62px;
    height: 62px;
  }

  .case-footer {
    flex-direction: column;
  }
}

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