:root{
  --bg: #0b1220;
  --surface: #121a2b;
  --text: #e6ebff;
  --muted: #9fb0d1;
  --accent: #5ea8ff;
  --accent-2: #72f5a2;
  --border: #1f2a44;
  --card: #0f182b;
  --shadow: 0 10px 30px rgba(0,0,0,.3);
}
:root.light{
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --accent: #2563eb;
  --accent-2: #059669;
  --border: #e2e8f0;
  --card: #ffffff;
  --shadow: 0 10px 24px rgba(2,6,23,.08);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: "Inter","Noto Sans JP",system-ui,-apple-system,Segoe UI,Roboto,"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans CJK JP",sans-serif;
  background: radial-gradient(1200px 600px at 60% -10%, rgba(94,168,255,.15), transparent),
              radial-gradient(800px 500px at -20% 20%, rgba(114,245,162,.10), transparent),
              var(--bg);
  color:var(--text);
  line-height:1.6;
}

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

.site-header{
  position:sticky; top:0; z-index:100;
  backdrop-filter: saturate(1.3) blur(10px);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  border-bottom:1px solid var(--border);
}
.header-inner{
  display:flex; align-items:center; gap:24px; min-height:64px;
}
.brand{display:flex; align-items:center; gap:10px; text-decoration:none; color:var(--text); font-weight:800; letter-spacing:.2px}
.brand-logo{font-size:22px; filter: drop-shadow(0 2px 0 rgba(0,0,0,.25));}
.brand-text{font-size:16px}

.main-nav{margin-left:auto; display:flex; gap:16px; align-items:center}
.main-nav a{color:var(--muted); text-decoration:none; padding:6px 8px; border-radius:8px; border:1px solid transparent}
.main-nav a:hover{color:var(--text); background: color-mix(in oklab, var(--surface) 86%, transparent); border-color:var(--border)}
.main-nav a.soon{opacity:.6; cursor:pointer}

.theme-toggle{margin-left:4px; background:var(--surface); color:var(--text); border:1px solid var(--border); border-radius:10px; padding:6px 9px; cursor:pointer}

.hero{padding:60px 0 30px; text-align:left}
.hero-badge{display:inline-block; background:linear-gradient(135deg, var(--accent), var(--accent-2)); color:white; padding:4px 10px; border-radius:999px; font-weight:700; font-size:12px; letter-spacing:.5px}
.hero h1{font-size:clamp(28px, 4.4vw, 44px); line-height:1.2; margin:12px 0 12px}
.lead{color:var(--muted); max-width:720px}
.hero-actions{display:flex; gap:12px; margin-top:18px; flex-wrap:wrap}

.btn{display:inline-flex; align-items:center; justify-content:center; gap:8px; padding:10px 14px; border-radius:12px; border:1px solid var(--border); text-decoration:none; color:var(--text); background:var(--surface); box-shadow:var(--shadow)}
.btn:hover{transform:translateY(-1px); transition:.18s}
.btn.primary{background: linear-gradient(135deg, color-mix(in oklab, var(--accent) 80%, #1e293b), color-mix(in oklab, var(--accent-2) 70%, #0f172a)); border-color:transparent; color:white; font-weight:700}
.btn.ghost{background: transparent; border-color:var(--border)}
.btn.link{border-color:transparent; background:transparent; text-decoration:underline}
.btn.disabled{opacity:.55; cursor:not-allowed}
.mt-12{margin-top:12px}

.grid-cards{display:grid; grid-template-columns:repeat(auto-fit, minmax(260px,1fr)); gap:16px; margin:26px 0 60px}
.card{
  background: linear-gradient(180deg, color-mix(in oklab, var(--card) 94%, transparent), color-mix(in oklab, var(--surface) 86%, transparent));
  border:1px solid var(--border);
  border-radius:16px;
  padding:18px;
  box-shadow:var(--shadow);
  display:flex; flex-direction:column; gap:8px;
}
.card-icon{font-size:22px}
.card h2{margin:6px 0 4px; font-size:18px}
.card-actions{display:flex; gap:8px; flex-wrap:wrap; margin-top:auto}
.card.disabled{opacity:.6}

.tag-soon{font-size:12px; padding:2px 8px; border-radius:999px; background:color-mix(in oklab, var(--surface) 86%, transparent); border:1px solid var(--border); color:var(--muted); margin-left:6px}

.split{display:grid; grid-template-columns:1.2fr .8fr; gap:18px; margin:18px 0 60px}
.split-col{background: linear-gradient(180deg, color-mix(in oklab, var(--card) 94%, transparent), color-mix(in oklab, var(--surface) 86%, transparent)); border:1px solid var(--border); border-radius:16px; padding:18px; box-shadow:var(--shadow)}
@media (max-width: 900px){ .split{grid-template-columns:1fr} }

.list-links{margin:0; padding-left:18px}
.list-links li{margin:6px 0}
.list-links a{color:var(--text); text-decoration:none; border-bottom:1px dashed var(--border)}
.list-links a:hover{border-bottom-color: var(--accent)}

.note{color:var(--muted); font-size:14px; margin-top:8px}

.page-title{margin:14px 0 10px}
.page-title h1{margin:.2em 0}
.breadcrumb ol{display:flex; gap:8px; list-style:none; padding:0; margin:10px 0 4px; color:var(--muted); flex-wrap:wrap}
.breadcrumb a{color:var(--muted); text-decoration:none}
.breadcrumb li::after{content:"›"; margin:0 8px; color:var(--border)}
.breadcrumb li:last-child::after{content:""}

.mini-cards{display:grid; grid-template-columns:repeat(auto-fill, minmax(240px,1fr)); gap:12px}
.mini-card{display:flex; gap:12px; padding:10px; border:1px solid var(--border); border-radius:12px; text-decoration:none; color:var(--text); background:var(--surface)}
.mini-card:hover{transform:translateY(-1px); transition:.18s}
.mini-card.disabled{opacity:.55; cursor:not-allowed}
.mini-eyecatch{font-size:22px}
.mini-title{font-weight:700}
.mini-meta{color:var(--muted); font-size:13px}

.bullets{margin:.2em 0 .2em 1em; padding:0}
.bullets li{margin:.2em 0}

.site-footer{margin-top:60px; border-top:1px solid var(--border); background:color-mix(in oklab, var(--surface) 86%, transparent)}
.footer-inner{display:grid; grid-template-columns:1fr auto auto; gap:16px; align-items:center; min-height:68px}
.footer-links a{color:var(--muted); margin-right:14px; text-decoration:none}
.footer-links a:hover{color:var(--text)}
.footer-copy{color:var(--muted); font-size:13px}
@media (max-width: 800px){ .footer-inner{grid-template-columns:1fr; gap:8px} }

/* prefers-color-scheme */
@media (prefers-color-scheme: light){
  :root:not(.dark){ /* allow JS toggle to override */ }
}