:root {
  color-scheme: light dark;
  --canvas: #f3f1ec;
  --surface: #fbfaf7;
  --surface-raised: #ffffff;
  --surface-sunken: #e8e7e3;
  --ink: #111317;
  --ink-muted: #545a64;
  --ink-faint: #626a75;
  --line: #c9c9c5;
  --line-strong: #8f9298;
  --blue: #1457e6;
  --blue-deep: #0a2f79;
  --blue-soft: #dce7ff;
  --green: #17724d;
  --amber: #9b5c07;
  --dark: #11151c;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow: 0 24px 60px rgba(26, 33, 45, .18);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #101217;
    --surface: #171a20;
    --surface-raised: #1d2128;
    --surface-sunken: #0d0f13;
    --ink: #f4f5f6;
    --ink-muted: #bdc3cc;
    --ink-faint: #929ba8;
    --line: #393e47;
    --line-strong: #69727f;
    --blue: #76a1ff;
    --blue-deep: #b9ceff;
    --blue-soft: #202e4e;
    --green: #68c997;
    --amber: #efb65f;
    --dark: #090b0f;
    --shadow: 0 26px 68px rgba(0, 0, 0, .48);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Noto Sans SC", "Yu Gothic UI", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-underline-offset: 4px; }
code { font-family: var(--mono); font-size: .9em; }
.wrap { width: min(100% - 48px, 1180px); margin-inline: auto; }

.masthead {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 80%, transparent);
  background: color-mix(in srgb, var(--canvas) 90%, transparent);
  backdrop-filter: blur(20px) saturate(140%);
}
.masthead .wrap { min-height: 72px; display: flex; align-items: center; gap: 24px; }
.wordmark { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); font-size: 16px; font-weight: 760; letter-spacing: -.02em; text-decoration: none; }
.wordmark span.sq { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; background: var(--ink); color: var(--surface); font-size: 15px; }
.masthead nav { margin-left: auto; display: flex; align-items: center; gap: 24px; }
.masthead nav a { color: var(--ink-muted); font-size: 13px; font-weight: 650; text-decoration: none; }
.masthead nav a:hover { color: var(--ink); }
.masthead nav a:last-child { min-height: 40px; padding: 7px 16px; display: inline-flex; align-items: center; border: 1px solid var(--line-strong); border-radius: var(--radius-sm); color: var(--ink); }
.lang-switch { display: flex; gap: 2px; padding: 3px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); }
.lang-switch button { min-width: 36px; min-height: 32px; padding: 4px 8px; border: 0; border-radius: var(--radius-sm); background: transparent; color: var(--ink-muted); font: 650 12px/1 inherit; cursor: pointer; }
.lang-switch button:hover { color: var(--ink); background: var(--surface-sunken); }
.lang-switch button[aria-current="true"] { background: var(--ink); color: var(--surface); }

.hero { position: relative; overflow: hidden; padding: 82px 0 76px; border-bottom: 1px solid var(--line); background: var(--surface); }
.hero::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(circle at 12% 20%, color-mix(in srgb, var(--blue) 10%, transparent), transparent 34%); }
.hero .wrap { position: relative; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(500px, .95fr); align-items: center; gap: clamp(40px, 5vw, 64px); }
.hero .kicker { width: fit-content; margin: 0 0 24px; padding: 7px 11px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-muted); background: var(--canvas); font: 700 12px/1.2 var(--mono); letter-spacing: .04em; text-transform: uppercase; }
.hero h1 { margin: 0; max-width: 12ch; font-size: clamp(48px, 4.35vw, 62px); font-weight: 790; line-height: 1.04; letter-spacing: -.055em; text-wrap: balance; }
.hero h1 span { display: block; white-space: nowrap; }
.hero h1::first-line { color: var(--blue); }
.hero > .wrap > div:first-child > p:not(.kicker):not(.fineprint) { max-width: 600px; margin: 28px 0 30px; color: var(--ink-muted); font-size: clamp(16px, 1.5vw, 18px); line-height: 1.85; }
.actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.btn { min-height: 44px; padding: 9px 18px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--line-strong); border-radius: var(--radius-sm); background: var(--surface-raised); color: var(--ink); font-size: 14px; font-weight: 700; text-decoration: none; transition: transform .16s ease, background .16s ease, border-color .16s ease; }
.btn:hover { transform: translateY(-2px); border-color: var(--ink); }
.btn.solid { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn.solid::after { content: "↓"; margin-left: 12px; font-size: 16px; }
.btn.solid:hover { background: var(--blue-deep); border-color: var(--blue-deep); }
.fineprint { margin: 20px 0 0 !important; color: var(--ink-faint) !important; font-size: 13px !important; line-height: 1.65 !important; }

.hero-visual { position: relative; min-height: 640px; isolation: isolate; }
.hero-art { position: absolute; inset: 0; width: 100%; height: 100%; border: 1px solid var(--line); border-radius: var(--radius-lg); object-fit: cover; box-shadow: var(--shadow); }
.hero-visual::after { content: ""; position: absolute; z-index: 1; inset: 0; border-radius: var(--radius-lg); background: linear-gradient(135deg, transparent 36%, color-mix(in srgb, var(--blue) 12%, transparent)); pointer-events: none; }
.app-shot { position: absolute; z-index: 2; right: -22px; bottom: -28px; width: min(57%, 340px); margin: 0; padding: 8px; border: 1px solid rgba(255,255,255,.28); border-radius: 24px; background: rgba(9, 12, 16, .88); box-shadow: 0 30px 65px rgba(0,0,0,.42); transform: rotate(1.5deg); }
.app-shot img { width: 100%; aspect-ratio: 971 / 1200; border-radius: 17px; object-fit: cover; }
.app-shot figcaption { padding: 10px 8px 4px; display: flex; justify-content: space-between; gap: 12px; color: #d9dde4; font: 650 10px/1.3 var(--mono); letter-spacing: .08em; }
.app-shot figcaption span { color: #79a5ff; }
.signal-card { position: absolute; z-index: 3; left: -28px; bottom: 34px; width: 230px; padding: 16px; border: 1px solid rgba(255,255,255,.26); border-radius: var(--radius-md); background: rgba(13, 17, 23, .88); color: #fff; box-shadow: 0 18px 44px rgba(0,0,0,.28); backdrop-filter: blur(16px); }
.signal-card small { display: block; margin-bottom: 12px; color: #aeb7c4; font: 700 10px/1 var(--mono); letter-spacing: .12em; }
.signal-row { display: flex; align-items: center; gap: 10px; font-size: 13px; }
.signal-dot { width: 10px; height: 10px; border-radius: 50%; background: #54d99a; box-shadow: 0 0 0 5px rgba(84,217,154,.14); }
.signal-row code { margin-left: auto; color: #8eb2ff; }

.marquee { overflow: hidden; border-bottom: 1px solid var(--line); background: var(--blue); color: #fff; }
.marquee > div { width: max-content; min-height: 48px; display: flex; align-items: center; gap: 30px; padding: 0 28px; font: 700 11px/1 var(--mono); letter-spacing: .11em; }
.marquee i { opacity: .45; font-style: normal; }

section { padding: 100px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 72px; }
section:nth-of-type(odd) { background: var(--canvas); }
section:nth-of-type(even) { background: var(--surface); }
section .wrap > h2 { max-width: 16ch; margin: 0 0 18px; font-size: clamp(38px, 5vw, 62px); font-weight: 780; line-height: 1.08; letter-spacing: -.05em; }
.lede { max-width: 660px; margin: 0 0 50px; color: var(--ink-muted); font-size: 17px; line-height: 1.9; }

.points { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; background: var(--surface-raised); }
.points > div { min-height: 280px; padding: 30px; }
.points > div + div { border-left: 1px solid var(--line); }
.points h3 { margin: 0 0 18px; padding: 0; border: 0; font-size: 20px; line-height: 1.35; }
.points h3::before { display: block; width: 38px; height: 5px; margin-bottom: 42px; border-radius: 999px; background: var(--blue); content: ""; }
.points p { margin: 0; color: var(--ink-muted); font-size: 15px; line-height: 1.8; }

#features { background: var(--dark); color: #f5f6f7; }
#features .lede { color: #b6bdc8; }
.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; overflow: hidden; border: 1px solid #343944; border-radius: var(--radius-lg); background: #343944; }
.features dl { margin: 0; padding: 0 32px 20px; background: #151a22; }
.features dt { position: relative; margin: 0; padding: 30px 0 8px 42px; border-top: 1px solid #343944; color: #fff; font-size: 17px; font-weight: 720; }
.features dt:first-child { border-top: 0; }
.features dt::before { content: "↗"; position: absolute; left: 0; top: 29px; width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid #505866; border-radius: 8px; color: #86aaff; font: 700 13px/1 var(--mono); }
.features dd { margin: 0 0 8px 42px; color: #b6bdc8; font-size: 14px; line-height: 1.8; }

ol.steps { margin: 0; padding: 0; list-style: none; counter-reset: n; border-top: 1px solid var(--line-strong); }
ol.steps li { counter-increment: n; display: grid; grid-template-columns: 86px minmax(0, 1fr); gap: 24px; padding: 28px 0; border-bottom: 1px solid var(--line); color: var(--ink-muted); font-size: 16px; }
ol.steps li::before { content: counter(n, decimal-leading-zero); color: var(--blue); font: 760 25px/1.2 var(--mono); }
ol.steps b { color: var(--ink); font-weight: 740; }
.note { margin: 30px 0 0; padding: 18px 20px; border: 1px solid color-mix(in srgb, var(--amber) 55%, var(--line)); border-left: 5px solid var(--amber); border-radius: var(--radius-sm); background: color-mix(in srgb, var(--amber) 8%, var(--surface)); color: var(--ink-muted); font-size: 14px; }

#api .wrap { display: grid; grid-template-columns: .7fr 1.3fr; gap: 56px; align-items: start; }
#api .wrap > h2, #api .wrap > .lede { grid-column: 1; }
#api .wrap > .lede { margin-bottom: 0; }
pre.code { grid-column: 2; grid-row: 1 / span 2; margin: 0; padding: 26px; overflow-x: auto; border: 1px solid #363d49; border-radius: var(--radius-lg); background: #0d1117; color: #e8edf5; font: 13px/1.9 var(--mono); white-space: pre-wrap; word-break: break-word; box-shadow: var(--shadow); }
pre.code .c { color: #84a5e8; }

#spec .wrap { display: grid; grid-template-columns: .55fr 1.45fr; gap: 72px; align-items: start; }
#spec .wrap > h2 { position: sticky; top: 104px; }
table.spec { width: 100%; border-collapse: collapse; font-size: 15px; }
table.spec th, table.spec td { padding: 19px 0; border-top: 1px solid var(--line); text-align: left; vertical-align: top; }
table.spec tr:first-child th, table.spec tr:first-child td { border-top: 1px solid var(--line-strong); }
table.spec th { width: 34%; color: var(--ink-faint); font-size: 13px; font-weight: 680; }

.creator { padding: 34px; display: grid; grid-template-columns: auto 1fr; gap: 26px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface-raised); }
.creator .badge { width: 64px; height: 64px; display: grid; place-items: center; border-radius: var(--radius-md); background: var(--blue); color: #fff; font-size: 22px; font-weight: 780; }
.creator h3 { margin: 0; font-size: 21px; }
.creator .romaji { margin: 2px 0 14px; color: var(--ink-faint); font: 13px/1.5 var(--mono); }
.creator p { max-width: 680px; margin: 0 0 20px; color: var(--ink-muted); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chips a { min-height: 40px; padding: 7px 13px; display: inline-flex; align-items: center; border: 1px solid var(--line-strong); border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); font-size: 13px; font-weight: 650; text-decoration: none; }
.chips a:hover { border-color: var(--blue); color: var(--blue); }

footer { padding: 42px 0 54px; background: var(--dark); color: #8f98a5; font-size: 13px; }
footer .links { margin-bottom: 20px; display: flex; flex-wrap: wrap; gap: 18px; }
footer a { color: #d8dde5; text-decoration: none; }
footer a:hover { color: #fff; text-decoration: underline; }
footer .legal { max-width: 760px; margin: 0; line-height: 1.75; }

a:focus-visible, button:focus-visible { outline: 3px solid color-mix(in srgb, var(--blue) 70%, white); outline-offset: 3px; }

@media (max-width: 960px) {
  .masthead nav .opt { display: none; }
  .hero .wrap { grid-template-columns: 1fr; }
  .hero h1 { max-width: 12ch; }
  .hero-visual { min-height: 590px; }
  .hero-art { object-position: center; }
  .signal-card { left: 20px; }
  .app-shot { right: 20px; }
  #api .wrap, #spec .wrap { grid-template-columns: 1fr; gap: 28px; }
  #api .wrap > h2, #api .wrap > .lede, pre.code { grid-column: 1; grid-row: auto; }
  #spec .wrap > h2 { position: static; }
}

@media (max-width: 820px) {
  .marquee > div { width: auto; min-height: 0; flex-wrap: wrap; justify-content: center; gap: 12px 18px; padding-block: 14px; text-align: center; }
  .points { grid-template-columns: 1fr; }
  .points > div { min-height: 0; }
  .points > div + div { border-left: 0; border-top: 1px solid var(--line); }
}

@media (max-width: 720px) {
  .wrap { width: min(100% - 32px, 1180px); }
  .masthead .wrap { min-height: 64px; gap: 12px; }
  .masthead nav { display: none; }
  .lang-switch { margin-left: auto; overflow-x: auto; }
  .lang-switch button { min-width: 34px; padding-inline: 6px; }
  .lang-switch button:first-child { min-width: 56px; }
  .hero { padding: 54px 0 46px; }
  .hero .wrap { gap: 42px; }
  .hero h1 { font-size: clamp(46px, 14vw, 66px); }
  .hero h1 span { display: inline; white-space: normal; }
  .actions { align-items: stretch; }
  .btn { flex: 1 1 calc(50% - 8px); }
  .btn.solid { flex-basis: 100%; }
  .hero-visual { min-height: 510px; }
  .app-shot { right: -8px; bottom: -16px; width: 59%; }
  .signal-card { left: -8px; bottom: 20px; width: 190px; }
  section { padding: 76px 0; }
  section .wrap > h2 { font-size: 42px; }
  .points, .features { grid-template-columns: 1fr; }
  .points > div { min-height: 0; padding: 26px; }
  .points > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .points h3::before { margin-bottom: 24px; }
  ol.steps li { grid-template-columns: 52px 1fr; gap: 14px; }
  .creator { grid-template-columns: 1fr; padding: 26px; }
}

@media (max-width: 460px) {
  .wordmark { font-size: 0; gap: 0; }
  .wordmark span.sq { font-size: 15px; }
  .hero-visual { min-height: 430px; }
  .btn { flex-basis: 100%; }
  .signal-card { width: 170px; padding: 13px; }
  .signal-row { font-size: 11px; }
  .app-shot { width: 64%; }
  .features dl { padding-inline: 22px; }
  pre.code { padding: 20px; font-size: 11px; }
  table.spec th { width: 40%; }
}

@media (max-height: 560px) and (min-width: 721px) {
  .hero { padding-block: 42px; }
  .hero-visual { min-height: 460px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}