@charset "UTF-8";
:root {
  color-scheme: dark;
  font-family:
    Inter, "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  color: #eeeae0;
  background: #131922;
  font-synthesis: none;
  --accent: #91d9ff;
  --muted: #a9b5bf;
  --line: #344351;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
a {
  color: inherit;
  text-decoration: none;
}
a:hover {
  color: var(--accent);
}
a:focus-visible {
  outline: 2px solid #b5a2ff;
  outline-offset: 6px;
}
.site-shell {
  max-width: 1280px;
  margin: auto;
  padding: 0 5vw;
}
.skip-link {
  position: fixed;
  top: -80px;
  left: 20px;
  background: var(--accent);
  color: #131922;
  padding: 16px;
  z-index: 10;
}
.skip-link:focus {
  top: 10px;
}
header {
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 26px;
  font-weight: 850;
  letter-spacing: -2px;
}
.brand span {
  font-size: 10px;
  letter-spacing: 0.17em;
  font-weight: 550;
}
.play-link {
  background: var(--accent);
  color: #131922;
  padding: 13px 20px;
  border-radius: 2px;
  font-weight: 750;
  letter-spacing: 0.08em;
  font-size: 12px;
}
.play-link:hover {
  color: #131922;
  background: #c9edff;
}
.play-link span {
  margin-left: 25px;
}
.hero {
  padding: 76px 0 50px;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.eyebrow {
  font-size: 10px;
  letter-spacing: 0.16em;
  font-weight: 650;
  color: var(--accent);
  margin: 0 0 26px;
}
h1 {
  font-size: clamp(38px, 6vw, 78px);
  line-height: 1.32;
  letter-spacing: -0.04em;
  margin: 0;
  font-weight: 700;
}
h1 em {
  font-style: normal;
  color: var(--accent);
}
.english-heading {
  color: #b5a2ff;
  font-size: clamp(18px, 2vw, 25px);
  line-height: 1.35;
  letter-spacing: -0.025em;
  margin: 28px 0 32px;
}
.hero-bottom {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: flex-end;
}
article p {
  font-size: 14px;
  line-height: 2;
  color: #b7c2cc;
  margin: 0;
  overflow-wrap: anywhere;
}
footer p {
  width: 100%;
  margin: 0;
  font-size: 10px;
  color: #82909d;
}
.hero-bottom p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.9;
  margin: 0;
}
.equation {
  display: flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
}
.equation span,
.equation b {
  width: 56px;
  height: 62px;
  border: 1px solid #536d7d;
  display: grid;
  place-items: center;
  border-radius: 3px;
  font-size: 22px;
  font-weight: 500;
  transform: rotate(-4deg);
}
.equation b {
  color: #b5a2ff;
  transform: rotate(5deg);
  border-color: #7d7199;
}
.equation i {
  font-style: normal;
  color: var(--accent);
  font-size: 26px;
  margin-left: 12px;
}
.bilingual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8%;
  padding-top: 40px;
}
.language-label {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.2em;
  margin: 0 0 42px;
}
article {
  margin-bottom: 42px;
}
article h2 {
  font-size: 18px;
  line-height: 1.5;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 15px;
}

.callout {
  border-left: 2px solid #b5a2ff;
  padding: 20px 26px;
  background: #1a222c;
  margin: 10px 0 55px;
}
.callout p {
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.15em;
  margin: 0 0 18px;
}
.callout a {
  display: block;
  margin: 12px 0;
  text-decoration: underline;
  text-underline-offset: 5px;
}
.series {
  padding: 45px 0;
  border-top: 1px solid var(--line);
}
.series > div {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.series a {
  padding: 20px;
  border: 1px solid var(--line);
  font-size: 17px;
}
.series a :where(span) {
  display: block;
  font-size: 9px;
  color: var(--muted);
  letter-spacing: 0.12em;
  margin-bottom: 13px;
}
.bottom-play {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  background: var(--accent);
  color: #131922;
  padding: 32px;
  margin: 0 0 60px;
}
.bottom-play:hover {
  color: #131922;
  background: #c9edff;
}
.bottom-play > span {
  font-size: 23px;
  font-weight: 700;
}
.bottom-play small {
  display: block;
  font-size: 10px;
  letter-spacing: 0.15em;
  margin-top: 10px;
}
.bottom-play b {
  font-size: 22px;
  white-space: nowrap;
}
footer {
  border-top: 1px solid var(--line);
  padding: 35px 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 28px;
}
footer nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 11px;
  color: var(--muted);
  align-items: center;
}

.language-column[lang="en"] article p {
  line-height: 1.8;
}
@media (max-width: 680px) {
  .site-shell {
    padding: 0 24px;
  }
  header {
    min-height: 80px;
  }
  .brand {
    gap: 12px;
    font-size: 23px;
  }
  .brand span {
    font-size: 8px;
    letter-spacing: 0.1em;
  }
  .hero {
    padding: 50px 0 34px;
  }
  .hero-bottom {
    align-items: flex-start;
    flex-direction: column;
  }
  .equation {
    align-self: flex-end;
  }
  .bilingual {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  .language-column[lang="en"] {
    border-top: 1px solid var(--line);
    padding-top: 30px;
  }
  .language-label {
    margin-bottom: 28px;
  }
  article {
    margin-bottom: 34px;
  }
  .series > div {
    grid-template-columns: 1fr;
    gap: 9px;
  }
  .series a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 19px 16px;
  }
  .series a :where(span) {
    margin: 0;
  }
  .bottom-play {
    padding: 24px 20px;
  }
  .bottom-play > span {
    font-size: 17px;
  }
  .bottom-play b {
    font-size: 17px;
  }
  footer {
    padding: 30px 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto;
  }
}