:root {
  color-scheme: light dark;
  --bg: #f4f4ef;
  --surface: #fffef8;
  --ink: #11140f;
  --muted: #596055;
  --line: #d7dacf;
  --lime: #b7ef39;
  --lime-ink: #182000;
  --blue: #2357e8;
  --blue-soft: #e7edff;
  --code: #11140f;
  --code-ink: #eff7e5;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d100c;
    --surface: #151913;
    --ink: #f1f4e9;
    --muted: #abb3a5;
    --line: #2c3329;
    --lime: #b7ef39;
    --lime-ink: #182000;
    --blue: #7d9cff;
    --blue-soft: #18213e;
    --code: #070906;
    --code-ink: #eff7e5;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Noto Sans SC", "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-underline-offset: .2em; }
code, pre { font-family: var(--mono); }
.wrap { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }

.topbar { border-bottom: 1px solid var(--line); }
.topbar .wrap { min-height: 68px; display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 760; letter-spacing: -.025em; }
.brand-mark { width: 28px; height: 28px; display: grid; place-items: center; background: var(--lime); color: var(--lime-ink); border-radius: 8px; font-family: var(--mono); font-size: .8rem; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 24px; font-size: .88rem; color: var(--muted); }
.nav a { text-decoration: none; }
.nav a:hover, .nav a:focus-visible { color: var(--ink); text-decoration: underline; }
.langs { display: flex; border: 1px solid var(--line); border-radius: 999px; padding: 3px; gap: 2px; }
.langs a { padding: 3px 8px; border-radius: 999px; font-size: .75rem; font-weight: 700; }
.langs a[aria-current="page"] { background: var(--ink); color: var(--bg); }

.hero { padding: clamp(64px, 9vw, 118px) 0 72px; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(340px, .92fr); gap: clamp(42px, 7vw, 88px); align-items: center; }
.eyebrow { margin: 0 0 18px; font-family: var(--mono); font-size: .78rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; color: var(--blue); }
h1 { margin: 0; max-width: 12ch; font-size: clamp(2.7rem, 6.6vw, 5.7rem); line-height: .98; letter-spacing: -.065em; font-weight: 820; }
.lead { max-width: 60ch; margin: 28px 0 0; color: var(--muted); font-size: clamp(1rem, 1.4vw, 1.16rem); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 10px 19px; border: 1px solid var(--ink); border-radius: 9px; text-decoration: none; font-weight: 720; font-size: .94rem; }
.button.primary { background: var(--ink); color: var(--bg); }
.button.secondary { background: transparent; }
.button:hover { transform: translateY(-1px); box-shadow: 0 4px 0 var(--lime); }
.fine { margin: 18px 0 0; color: var(--muted); font-size: .8rem; }

.bridge { background: var(--code); color: var(--code-ink); border-radius: 18px; padding: 18px; box-shadow: 18px 18px 0 var(--lime); font-family: var(--mono); }
.bridge-head { display: flex; gap: 6px; padding: 0 0 15px; border-bottom: 1px solid #30372d; }
.bridge-head i { width: 9px; height: 9px; border-radius: 50%; background: #4b5547; }
.bridge-flow { display: grid; gap: 12px; padding-top: 18px; }
.node { border: 1px solid #354031; border-radius: 10px; padding: 13px 14px; display: flex; align-items: center; gap: 12px; }
.node b { font-size: .9rem; }
.node small { margin-left: auto; color: #9eaa97; font-size: .7rem; }
.node.hot { border-color: var(--lime); color: var(--lime); }
.arrow { color: #778170; padding-left: 17px; height: 12px; line-height: 12px; }
.terminal { margin-top: 18px; padding-top: 16px; border-top: 1px solid #30372d; color: #aeb7a7; font-size: .74rem; overflow-wrap: anywhere; }
.terminal strong { color: var(--lime); }

section { padding: clamp(64px, 8vw, 96px) 0; border-bottom: 1px solid var(--line); }
.section-label { margin: 0 0 12px; color: var(--blue); font-family: var(--mono); font-size: .75rem; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
h2 { margin: 0; max-width: 20ch; font-size: clamp(2rem, 4.2vw, 3.7rem); line-height: 1.08; letter-spacing: -.05em; }
.section-intro { max-width: 65ch; margin: 20px 0 42px; color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.card { background: var(--surface); padding: 28px; }
.card .num { display: block; margin-bottom: 30px; color: var(--blue); font-family: var(--mono); font-size: .78rem; }
.card h3 { margin: 0 0 10px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: .92rem; }

.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 52px; }
.feature { padding: 22px 0; border-top: 1px solid var(--line); }
.feature h3 { margin: 0 0 6px; font-size: 1rem; }
.feature p { margin: 0; color: var(--muted); font-size: .9rem; }

.steps { display: grid; grid-template-columns: .8fr 1.2fr; gap: 64px; align-items: start; }
.step-list { list-style: none; margin: 0; padding: 0; counter-reset: steps; }
.step-list li { counter-increment: steps; display: grid; grid-template-columns: 34px 1fr; gap: 12px; padding: 17px 0; border-top: 1px solid var(--line); }
.step-list li::before { content: counter(steps, decimal-leading-zero); color: var(--blue); font: 700 .76rem/1.8 var(--mono); }
.step-list strong { display: block; margin-bottom: 2px; }
.step-list span { color: var(--muted); font-size: .9rem; }
pre { margin: 24px 0 0; background: var(--code); color: var(--code-ink); padding: 20px; border-radius: 12px; overflow-x: auto; font-size: .8rem; line-height: 1.65; }

.safety { background: var(--blue); color: white; }
.safety .section-label, .safety .section-intro { color: #dbe3ff; }
.safety-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 42px; }
.safety-item { padding: 20px 0; border-top: 1px solid rgba(255,255,255,.28); }
.safety-item b { display: block; margin-bottom: 5px; }
.safety-item p { margin: 0; color: #e0e6ff; font-size: .9rem; }

.meta-grid { display: grid; grid-template-columns: repeat(2, 1fr); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.meta-grid > div { padding: 22px 25px; background: var(--surface); border-bottom: 1px solid var(--line); }
.meta-grid > div:nth-child(odd) { border-right: 1px solid var(--line); }
.meta-grid dt { color: var(--muted); font-size: .78rem; }
.meta-grid dd { margin: 5px 0 0; font-weight: 690; }
.notice { margin-top: 26px; padding: 18px 20px; border-left: 4px solid var(--lime); background: var(--surface); color: var(--muted); font-size: .9rem; }

footer { padding: 38px 0 54px; }
.footer-grid { display: flex; justify-content: space-between; gap: 28px; align-items: flex-start; }
.footer-grid p { margin: 0; color: var(--muted); font-size: .82rem; max-width: 62ch; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 16px; font-size: .82rem; font-weight: 680; }

@media (max-width: 860px) {
  .hero-grid, .steps { grid-template-columns: 1fr; }
  .bridge { max-width: 620px; }
  .cards { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .wrap { width: min(100% - 28px, 1120px); }
  .topbar .wrap { padding: 12px 0; flex-wrap: wrap; }
  .nav { width: 100%; margin: 0; justify-content: space-between; gap: 12px; }
  .nav > a { display: none; }
  .langs { margin-left: auto; }
  h1 { font-size: clamp(2.55rem, 15vw, 4rem); }
  .hero { padding-top: 54px; }
  .bridge { box-shadow: 9px 9px 0 var(--lime); }
  .meta-grid, .safety-list { grid-template-columns: 1fr; }
  .meta-grid > div:nth-child(odd) { border-right: 0; }
  .footer-grid { flex-direction: column; }
  .footer-links { justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button:hover { transform: none; }
}