:root {
  --bg: #08090c;
  --ink: #e9e7e2;
  --dim: rgba(233, 231, 226, 0.58);
  --faint: rgba(233, 231, 226, 0.36);
  --hairline: rgba(233, 231, 226, 0.16);
  --maxw: 1080px;
  --serif: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Hiragino Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  font-weight: 400;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.9;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: rgba(233, 231, 226, 0.22); }

/* 背景：ごく控えめな星。動かさない */
.starfield { position: fixed; inset: 0; z-index: -2; background: var(--bg); }
.starfield::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(1.2px 1.2px at 21% 28%, rgba(255,255,255,0.55), transparent),
    radial-gradient(1px 1px at 68% 14%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1.4px 1.4px at 44% 71%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 87% 55%, rgba(255,255,255,0.35), transparent),
    radial-gradient(1px 1px at 9% 84%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1.3px 1.3px at 92% 89%, rgba(255,255,255,0.45), transparent);
  background-repeat: repeat;
  background-size: 720px 720px;
}

/* ===== NAV ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}
.nav.scrolled { background: rgba(8, 9, 12, 0.92); border-bottom-color: var(--hairline); }
.nav, .nav-inner { display: flex; align-items: center; justify-content: space-between; }
.nav { max-width: none; padding: 18px max(24px, calc((100vw - var(--maxw)) / 2)); }
.brand { display: flex; align-items: center; gap: 12px; font-family: var(--mono); font-size: 13px; letter-spacing: 0.3em; }
.brand img { border-radius: 6px; }
.nav-links { display: flex; align-items: center; gap: 32px; font-size: 13px; }
.nav-links a { color: var(--dim); transition: color 0.2s; }
.nav-links a:hover { color: var(--ink); }
.nav-cta {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em;
  color: var(--ink) !important;
  border: 1px solid var(--hairline); padding: 8px 16px;
  transition: background 0.2s, color 0.2s;
}
.nav-cta:hover { background: var(--ink); color: var(--bg) !important; }

/* ===== HERO ===== */
.hero {
  max-width: var(--maxw); margin: 0 auto; padding: 96px 24px 72px;
  display: grid; grid-template-columns: 1fr 1.15fr; gap: 64px; align-items: end;
}
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  color: var(--faint); margin-bottom: 28px;
}
.hero h1 {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(38px, 5.4vw, 60px); line-height: 1.42; letter-spacing: 0.05em;
}
.lead { margin-top: 28px; font-size: 15px; color: var(--dim); line-height: 2.1; }
.hero-actions { margin-top: 40px; display: flex; gap: 28px; align-items: center; flex-wrap: wrap; }
.hero-note { margin-top: 26px; font-family: var(--mono); font-size: 11px; color: var(--faint); letter-spacing: 0.1em; }

.btn {
  display: inline-block;
  padding: 13px 28px; font-size: 13.5px; font-weight: 500; letter-spacing: 0.08em;
  border: 1px solid var(--ink); color: var(--ink);
  transition: background 0.2s, color 0.2s;
}
.btn:hover { background: var(--ink); color: var(--bg); }
.btn[aria-disabled="true"] { border-color: var(--hairline); color: var(--dim); pointer-events: none; }
.textlink {
  font-size: 13.5px; color: var(--dim);
  border-bottom: 1px solid var(--hairline); padding-bottom: 3px;
  transition: color 0.2s, border-color 0.2s;
}
.textlink:hover { color: var(--ink); border-color: var(--ink); }

.hero-frame { border: 1px solid var(--hairline); }
.hero-frame img { width: 100%; }
.hero-frame figcaption {
  padding: 12px 2px 0; border-top: 1px solid transparent;
  font-family: var(--mono); font-size: 11px; color: var(--faint); letter-spacing: 0.06em;
}

/* ===== SPEC STRIP ===== */
.specs {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline);
}
.specs div { padding: 28px 20px; }
.specs div + div { border-left: 1px solid var(--hairline); }
.spec-num {
  display: block; font-family: var(--serif); font-size: 26px; letter-spacing: 0.04em;
}
.spec-label { display: block; margin-top: 4px; font-size: 12px; color: var(--dim); }

/* ===== SECTIONS ===== */
.section-head {
  margin: 140px 0 56px; padding-top: 28px;
  border-top: 1px solid var(--hairline);
  display: flex; align-items: baseline; gap: 32px; flex-wrap: wrap;
}
.section-eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; color: var(--faint);
}
.section-title {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(26px, 3.6vw, 36px); letter-spacing: 0.06em;
}
.features, .gallery { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===== FEATURES：番号付きの行組み ===== */
.feature-list { border-bottom: 1px solid var(--hairline); }
.frow {
  display: grid; grid-template-columns: 80px 240px 1fr; gap: 24px; align-items: baseline;
  padding: 30px 0; border-top: 1px solid var(--hairline);
  transition: opacity 0.25s;
}
.feature-list:hover .frow:not(:hover) { opacity: 0.45; }
.fnum { font-family: var(--mono); font-size: 12px; color: var(--faint); letter-spacing: 0.1em; }
.frow h3 { font-family: var(--serif); font-weight: 600; font-size: 19px; letter-spacing: 0.06em; }
.frow p { font-size: 13.5px; color: var(--dim); line-height: 2; }

/* ===== GALLERY ===== */
.shots { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px 28px; }
.shot { margin: 0; }
.shot-wide { grid-column: span 2; }
.shot img { width: 100%; border: 1px solid var(--hairline); }
.shot figcaption {
  margin-top: 12px; font-size: 12.5px; color: var(--dim); letter-spacing: 0.04em;
}
.shot figcaption span {
  font-family: var(--mono); font-size: 11px; color: var(--faint); margin-right: 14px;
}

/* ===== DOWNLOAD ===== */
.download {
  max-width: var(--maxw); margin: 150px auto 0; padding: 64px 24px 110px;
  border-top: 1px solid var(--hairline);
}
.download .section-eyebrow { margin-bottom: 24px; }
.download h2 {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(28px, 4vw, 42px); letter-spacing: 0.06em;
}
.dl-lead { margin: 20px 0 40px; font-size: 14px; color: var(--dim); max-width: 480px; }

/* ===== FOOTER ===== */
.footer {
  max-width: var(--maxw); margin: 0 auto; padding: 32px 24px 44px;
  border-top: 1px solid var(--hairline);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  color: var(--faint); font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em;
}
.footer-brand { display: flex; align-items: center; gap: 10px; letter-spacing: 0.3em; color: var(--dim); }
.footer-brand img { border-radius: 5px; }

/* ===== LEGAL PAGE ===== */
.legal { max-width: 760px; margin: 0 auto; padding: 0 24px 110px; }
.legal .section-head { margin: 72px 0 20px; }
.legal-updated { font-family: var(--mono); font-size: 11px; color: var(--faint); letter-spacing: 0.08em; margin-bottom: 48px; }
.legal-block { padding: 28px 0; border-top: 1px solid var(--hairline); }
.legal-block h2 { font-family: var(--serif); font-weight: 600; font-size: 18px; letter-spacing: 0.08em; margin-bottom: 12px; }
.legal-block p { font-size: 13.5px; color: var(--dim); line-height: 2.1; }
.legal-block p + p { margin-top: 12px; }
.legal-block strong { color: var(--ink); font-weight: 700; }
.legal-block a { text-decoration: underline; text-underline-offset: 3px; }
.legal-block a:hover { color: var(--ink); }
.legal-block ul { margin: 12px 0; padding-left: 1.4em; }
.legal-block li { font-size: 13.5px; color: var(--dim); line-height: 2.1; }
.legal-back { margin-top: 56px; }
.footer p a { text-decoration: underline; text-underline-offset: 3px; }
.footer p a:hover { color: var(--ink); }

/* ===== REVEAL ===== */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.9s ease, transform 0.9s ease; }
.reveal.in { opacity: 1; transform: none; }

/* RESPONSIVE */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 48px; padding-top: 48px; }
  .hero-visual { order: -1; }
  .frow { grid-template-columns: 56px 1fr; }
  .frow p { grid-column: 2; }
  .specs { grid-template-columns: repeat(2, 1fr); }
  .specs div:nth-child(3) { border-left: none; }
  .specs div:nth-child(n+3) { border-top: 1px solid var(--hairline); }
}
@media (max-width: 560px) {
  .nav-links a:not(.nav-cta) { display: none; }
  .shots { grid-template-columns: 1fr; gap: 32px; }
  .shot-wide { grid-column: span 1; }
  .section-head { margin: 96px 0 40px; flex-direction: column; gap: 8px; }
  .frow { padding: 24px 0; }
  .footer { flex-direction: column; text-align: center; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}