:root{
  --bg:#071018;
  --panel:#0b1620;
  --muted:#9bb3c9;
  --accent:#1f6aa5;
  --text:#e6eef6;
  --card:#07161d;
}

*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter, "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
.site-header{padding:18px 24px;border-bottom:1px solid rgba(255,255,255,0.03);display:flex;align-items:center;justify-content:space-between}
.site-header h1{margin:0;font-size:18px;color:#cfe8ff}
.main-nav a{margin-left:12px;font-size:14px;color:var(--muted)}
.container{max-width:980px;margin:28px auto;padding:0 18px}
h2{color:#9fc7ff;margin-top:18px}
ul,ol{color:var(--muted)}
.timeline li{margin:8px 0}
.site-footer{padding:18px 24px;border-top:1px solid rgba(255,255,255,0.03);text-align:center;color:var(--muted);font-size:13px}
.gallery-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;margin-top:12px}
.thumb{background:var(--panel);padding:12px;border-radius:8px;border:1px solid rgba(255,255,255,0.03)}
.thumb-img{height:160px;border-radius:6px;background:linear-gradient(180deg,#071a24,#0b2a36);display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:14px}
.placeholder{opacity:0.6}
@media (max-width:640px){
  .main-nav{display:none}
  .site-header{flex-direction:column;align-items:flex-start}
}