:root {
  --bg: #2e5747;
  --panel: #111317;
  --panel-alt: #0f1318;
  --text: #e6e6e6;
  --muted: #a8b0b9;
  --accent: #3fb3ff;
  --border: #1f2430;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", "Noto Sans JP", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: radial-gradient(1200px 700px at 10% -10%, #0f172a 0%, transparent 60%) , var(--bg);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: min(1100px, 92%); margin-inline: auto; }
.narrow { width: min(800px, 92%); margin-inline: auto; }

.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 12px; top: 12px; background: #000; color: #fff; padding: 8px 12px; border-radius: 8px; z-index: 999; }

.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(11,12,15,.7); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .02em; color: var(--text); }
.brand-logo { width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(135deg, var(--accent), #7cd5ff); color: #00121e; display: grid; place-items: center; font-weight: 800; }
.brand-text { opacity: .95; }

.nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 18px; align-items: center; }
.nav a { color: var(--text); opacity: .9; padding: 8px 10px; border-radius: 10px; }
.nav a:hover { background: #141821; text-decoration: none; }

.btn {
  display: inline-block; padding: 10px 16px; border-radius: 12px;
  background: #1a2230; color: var(--text); border: 1px solid var(--border);
  box-shadow: var(--shadow); transition: transform .06s ease, filter .2s ease;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn-accent { background: linear-gradient(135deg, var(--accent), #7cd5ff); color: #00121e; border-color: transparent; }

.hero {
  padding: 88px 0 40px; text-align: center;
  background: radial-gradient(800px 500px at 80% -20%, rgba(63,179,255,.15), transparent 60%);
}
.hero h1 { font-size: clamp(26px, 5vw, 42px); margin: 0 0 8px; }
.lead { font-size: 1.1rem; color: var(--muted); margin: 0; }
.desc { margin-top: 10px; opacity: .95; }
.hero-actions { display: flex; gap: 12px; justify-content: center; margin-top: 18px; }

.section { padding: 52px 0; }
.section.alt { background: linear-gradient(180deg, rgba(255,255,255,.02), transparent); }

.page-hero { padding: 64px 0 24px; border-bottom: 1px solid var(--border); background: radial-gradient(700px 400px at 10% -10%, rgba(63,179,255,.08), transparent 60%); }
.page-hero h1 { margin: 0 0 6px; }

.mvv { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-top: 14px; }
.mvv h3 { margin: 0 0 6px; }
.mvv ul { margin: 8px 0 0 18px; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow);
}
.card h3 { margin-top: 4px; }

.brand-list { line-height: 1.9; }

.deflist { display: grid; grid-template-columns: 140px 1fr; gap: 10px 18px; }
.deflist dt { color: var(--muted); }
.deflist dd { margin: 0; }

.news-item { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.news-item time { color: var(--muted); font-feature-settings: "palt"; }

.faq { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 12px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq-body { padding-top: 10px; color: var(--text); }

.cta { text-align: center; }

.site-footer { border-top: 1px solid var(--border); background: #0a0c10; padding: 32px 0; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.brand-footer { display: flex; align-items: center; gap: 10px; font-weight: 700; margin-bottom: 6px; }
.muted { color: var(--muted); }
.small { font-size: .95rem; }

@media (max-width: 640px) {
  .nav ul { gap: 8px; flex-wrap: wrap; }
  .deflist { grid-template-columns: 1fr; }
}