:root {
  --ink: #10110f; --ink-soft: #171913; --paper: #f3f1e8; --muted: #a7aaa0;
  --line: rgba(243, 241, 232, 0.16); --line-strong: rgba(243, 241, 232, 0.34);
  --cyan: #42d9ff; --lime: #d8ff41; --red: #ff4e3a; --amber: #ffb21f;
  --radius: 6px; --max: 1180px;
  --mono: "SFMono-Regular", "Roboto Mono", Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; min-height: 100vh;
  background:
    linear-gradient(rgba(216, 255, 65, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(66, 217, 255, 0.05) 1px, transparent 1px),
    var(--ink);
  background-size: 44px 44px; color: var(--paper); font-family: var(--sans);
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
p, h1, h2, h3 { margin: 0; overflow-wrap: anywhere; }
.wrap { width: min(calc(100% - 28px), var(--max)); margin: 0 auto; }
.site-header {
  position: fixed; top: 14px; left: 50%; z-index: 20;
  width: min(calc(100% - 28px), var(--max)); min-height: 58px;
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  padding: 8px 8px 8px 12px; border: 1px solid rgba(243, 241, 232, 0.2);
  background: rgba(16, 17, 15, 0.72); backdrop-filter: blur(18px); transform: translateX(-50%);
}
.brand-lockup { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid var(--line-strong); background: var(--paper); color: var(--ink); font-family: var(--mono); font-weight: 800; }
.brand-lockup strong { font-size: 0.92rem; display: block; }
.brand-lockup small { display: block; margin-top: 2px; color: var(--muted); font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase; }
.back-link { display: inline-flex; align-items: center; gap: 8px; height: 36px; padding: 0 14px; border: 1px solid rgba(243, 241, 232, 0.14); font-family: var(--mono); font-size: 0.78rem; color: var(--muted); }
.back-link:hover { color: var(--paper); border-color: var(--line-strong); }
.case-hero { position: relative; min-height: 72vh; display: flex; align-items: flex-end; overflow: hidden; }
.case-hero img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.case-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(16,17,15,0.35) 0%, rgba(16,17,15,0.1) 40%, rgba(16,17,15,0.92) 100%); }
.case-hero-copy { position: relative; z-index: 2; padding: 140px 0 48px; width: 100%; }
.section-kicker { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--lime); margin-bottom: 16px; }
.case-hero h1 { font-size: clamp(2.1rem, 5.4vw, 4rem); line-height: 1.04; letter-spacing: -0.02em; }
.case-hero .one-liner { margin-top: 14px; max-width: 640px; color: rgba(243,241,232,0.85); font-size: 1.05rem; line-height: 1.6; }
.translation-sub { display: block; margin-top: 6px; color: var(--muted); font-size: 0.92em; }
.credits { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(23, 25, 19, 0.6); }
.credits-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); margin: 0; }
.credit-cell { padding: 18px 16px; border-right: 1px solid var(--line); }
.credit-cell:last-child { border-right: 0; }
.credit-cell dt { margin: 0; font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.credit-cell dd { margin: 8px 0 0; font-size: 0.88rem; line-height: 1.45; }
section.block { padding: 88px 0; }
.block + .block { border-top: 1px solid var(--line); }
.block h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); line-height: 1.25; letter-spacing: -0.01em; max-width: 820px; }
.lede { margin-top: 22px; max-width: 740px; color: rgba(243,241,232,0.88); line-height: 1.75; }
.lede + .lede { margin-top: 16px; }
.two-col { display: grid; grid-template-columns: 1.5fr 1fr; gap: 56px; align-items: start; }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; } }
.role-steps { margin-top: 40px; display: grid; gap: 0; border: 1px solid var(--line); }
.role-step { display: grid; grid-template-columns: 64px 1fr; gap: 20px; padding: 26px 24px; border-bottom: 1px solid var(--line); }
.role-step:last-child { border-bottom: 0; }
.role-step .num { font-family: var(--mono); color: var(--cyan); font-size: 0.85rem; padding-top: 4px; }
.role-step h3 { font-size: 1.05rem; margin-bottom: 8px; }
.role-step p { color: var(--muted); font-size: 0.92rem; line-height: 1.7; }
.facts { border: 1px solid var(--line-strong); background: var(--ink-soft); padding: 26px 24px; }
.facts h3 { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--lime); margin-bottom: 18px; }
.fact { padding: 14px 0; border-top: 1px solid var(--line); }
.fact strong { display: block; font-size: 1.6rem; letter-spacing: -0.02em; }
.fact span { display: block; margin-top: 4px; color: var(--muted); font-size: 0.82rem; line-height: 1.5; }
.gallery { margin-top: 40px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
@media (max-width: 720px) { .gallery { grid-template-columns: 1fr 1fr; } }
.gallery figure { margin: 0; border: 1px solid var(--line); }
.gallery img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.gallery figcaption { padding: 10px 12px; font-family: var(--mono); font-size: 0.68rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.1em; }
.media-placeholder { display: grid; place-items: center; aspect-ratio: 4 / 3; background: repeating-linear-gradient(45deg, rgba(243,241,232,0.04) 0 10px, transparent 10px 20px); color: var(--muted); font-family: var(--mono); font-size: 0.7rem; text-align: center; padding: 12px; text-transform: uppercase; letter-spacing: 0.1em; line-height: 1.9; }
.video-frame { margin-top: 40px; border: 1px solid var(--line-strong); aspect-ratio: 16 / 9; display: grid; place-items: center; background: var(--ink-soft); }
.video-frame .play { width: 64px; height: 64px; border-radius: 50%; border: 1px solid var(--line-strong); display: grid; place-items: center; color: var(--lime); font-size: 1.2rem; margin: 0 auto 12px; }
.video-frame div { text-align: center; color: var(--muted); font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; line-height: 2; }
.next-strip { border-top: 1px solid var(--line); }
.next-card { display: grid; grid-template-columns: 1fr 320px; align-items: center; gap: 32px; padding: 48px 0; }
@media (max-width: 720px) { .next-card { grid-template-columns: 1fr; } }
.next-card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; border: 1px solid var(--line); }
.next-card .k { font-family: var(--mono); font-size: 0.7rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.14em; }
.next-card h3 { margin-top: 10px; font-size: 1.6rem; }
.next-card a:hover h3, .next-card:hover h3 { color: var(--lime); }
.cta { border-top: 1px solid var(--line); padding: 88px 0; text-align: center; }
.cta h2 { font-size: clamp(1.6rem, 3.4vw, 2.4rem); }
.cta p { margin: 16px auto 0; max-width: 560px; color: var(--muted); line-height: 1.7; }
.button { display: inline-flex; align-items: center; gap: 10px; margin-top: 28px; height: 48px; padding: 0 26px; border: 1px solid var(--paper); background: var(--paper); color: var(--ink); font-weight: 600; font-size: 0.95rem; }
.button:hover { background: var(--lime); border-color: var(--lime); }
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-family: var(--mono); font-size: 0.72rem; }
footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* language switching */
.t-ja, .t-en, .t-zh { display: none; }
body.lang-dual .t-ja { display: inline; }
body.lang-dual .t-en { display: block; margin-top: 6px; color: var(--muted); font-size: 0.92em; font-weight: 400; }
body.lang-ja .t-ja { display: inline; }
body.lang-en .t-en { display: inline; }
body.lang-zh .t-zh { display: inline; }
.language-switcher { display: flex; align-items: center; gap: 2px; border: 1px solid rgba(243, 241, 232, 0.14); padding: 3px; }
.language-switcher button {
  height: 30px; padding: 0 10px; border: 0; background: transparent; color: var(--muted);
  font-family: var(--mono); font-size: 0.72rem; cursor: pointer; letter-spacing: 0.04em;
}
.language-switcher button.is-active { background: var(--paper); color: var(--ink); }
.language-switcher button:hover:not(.is-active) { color: var(--paper); }
.header-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
@media (max-width: 640px) { .site-header { flex-wrap: wrap; } }