:root {
  --bg: #0b0f14; --bg-2: #0f151d; --surface: #141b24; --raised: #1a222d; --line: #232c38; --line-2: #2e3947;
  --text: #e8eef4; --sub: #a7b3bf; --muted: #74808d;
  --accent: #6cc4ff; --accent-2: #3aa8f0; --accent-ink: #06121c; --accent-soft: rgba(108,196,255,.12);
  --ok: #3fb950; --warn: #e0a83a; --bad: #f85149;
  --font: "Segoe UI Variable Text", "Segoe UI", "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  --mono: "Cascadia Code", Consolas, "BIZ UDGothic", monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.75 var(--font); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
code { font-family: var(--mono); font-size: .92em; background: var(--raised); border: 1px solid var(--line); border-radius: 5px; padding: 0 5px; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

.top { position: sticky; top: 0; z-index: 10; background: rgba(11,15,20,.82); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; gap: 22px; height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; font-size: 17px; }
.logo:hover { text-decoration: none; }
.top nav { margin-left: auto; display: flex; gap: 22px; font-size: 14px; }
.top nav a { color: var(--sub); }
.top nav a:hover { color: var(--text); text-decoration: none; }

.hero { position: relative; overflow: hidden; padding: 84px 0 40px; text-align: center; }
.hero::before { content: ""; position: absolute; inset: -40% -10% auto; height: 620px; background: radial-gradient(closest-side, rgba(58,168,240,.22), transparent 70%); pointer-events: none; }
.hero .wrap { position: relative; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--accent); background: var(--accent-soft); border: 1px solid rgba(108,196,255,.28); padding: 4px 12px; border-radius: 999px; }
.hero h1 { font-size: clamp(34px, 6vw, 60px); line-height: 1.15; margin: 22px 0 16px; letter-spacing: .01em; font-weight: 750; }
.hero h1 .grad { white-space: nowrap; background: linear-gradient(120deg, #bfeaff, #6cc4ff 45%, #3aa8f0); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { max-width: 640px; margin: 0 auto; color: var(--sub); font-size: 17px; }
.cta { display: flex; justify-content: center; align-items: center; gap: 14px; flex-wrap: wrap; margin: 32px 0 10px; }
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 13px 24px; border-radius: 12px; font-weight: 650; font-size: 15.5px; border: 1px solid var(--line-2); color: var(--text); background: var(--surface); }
.btn:hover { text-decoration: none; border-color: rgba(108,196,255,.5); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; box-shadow: 0 8px 30px rgba(58,168,240,.35); }
.btn.primary:hover { background: var(--accent-2); }
.btn svg { width: 18px; height: 18px; }
.meta { color: var(--muted); font-size: 13px; }

.shot { margin: 46px auto 0; max-width: 1040px; border-radius: 16px; border: 1px solid var(--line-2); overflow: hidden; box-shadow: 0 30px 80px rgba(0,0,0,.55), 0 0 0 1px rgba(255,255,255,.02); background: var(--surface); }
.shot .bar { display: flex; gap: 7px; padding: 10px 14px; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.shot .bar i { width: 11px; height: 11px; border-radius: 50%; background: var(--line-2); }

section { padding: 84px 0; }
section + section { border-top: 1px solid var(--line); }
h2 { font-size: clamp(24px, 3.4vw, 34px); margin: 0 0 10px; line-height: 1.3; }
.sec-lead { color: var(--sub); margin: 0 0 40px; max-width: 680px; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 22px; }
.card .ic { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); margin-bottom: 14px; }
.card .ic svg { width: 20px; height: 20px; }
.card h3 { margin: 0 0 6px; font-size: 16.5px; }
.card p { margin: 0; color: var(--sub); font-size: 14.2px; }

.auto { display: grid; grid-template-columns: 1fr 1.25fr; gap: 40px; align-items: center; }
.auto ol { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; counter-reset: s; }
.auto li { counter-increment: s; display: grid; grid-template-columns: 34px 1fr; gap: 12px; }
.auto li::before { content: counter(s); width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; background: var(--raised); border: 1px solid var(--line-2); font-weight: 700; color: var(--accent); font-size: 14px; }
.auto li b { display: block; }
.auto li span { color: var(--sub); font-size: 14.2px; }
.auto .shot { margin: 0; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; counter-reset: st; }
.steps .card { position: relative; padding-top: 52px; }
.steps .card::before { counter-increment: st; content: "STEP " counter(st); position: absolute; top: 20px; left: 22px; font: 700 12px var(--mono); color: var(--accent); letter-spacing: .08em; }

.dl { text-align: center; }
.dl .box { max-width: 640px; margin: 0 auto; background: var(--surface); border: 1px solid var(--line-2); border-radius: 18px; padding: 34px 28px; }
.dl .box img { margin: 0 auto 14px; }
.dl ul { text-align: left; color: var(--sub); font-size: 14px; margin: 22px auto 0; max-width: 520px; padding-left: 1.2em; }
.note { margin-top: 18px; font-size: 13.5px; color: var(--muted); }

.faq { max-width: 820px; }
.faq details { border: 1px solid var(--line); border-radius: 12px; background: var(--surface); margin-bottom: 10px; }
.faq summary { cursor: pointer; padding: 14px 18px; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--muted); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0; padding: 0 18px 16px; color: var(--sub); font-size: 14.2px; }

footer { border-top: 1px solid var(--line); padding: 30px 0 46px; color: var(--muted); font-size: 13.5px; }
footer .wrap { display: flex; gap: 20px; flex-wrap: wrap; align-items: center; }
footer nav { margin-left: auto; display: flex; gap: 18px; }
footer a { color: var(--sub); }

.doc { max-width: 780px; padding: 56px 24px 80px; }
.doc h1 { font-size: 30px; margin: 0 0 6px; }
.doc h2 { font-size: 19px; margin: 32px 0 8px; }
.doc p, .doc li { color: var(--sub); }

@media (max-width: 900px) {
  .grid, .steps { grid-template-columns: 1fr 1fr; }
  .auto { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .wrap { padding: 0 16px; }
  .top nav { display: none; }
  .grid, .steps { grid-template-columns: 1fr; }
  .hero { padding-top: 56px; }
  section { padding: 60px 0; }
  .btn { width: 100%; justify-content: center; }
}