:root{
  --bg:#f6f7fb;
  --card:#fff;
  --text:#111827;
  --muted:#6b7280;
  --accent:#0b84ff;
  --radius:10px;
  --gap:14px;
  --shadow: 0 4px 12px rgba(16,24,40,0.06);
  --print-font: "Hiragino Kaku Gothic Pro","Yu Gothic","Noto Sans JP",sans-serif;
}
[data-theme="dark"]{
  --bg:#0b0c0e;
  --card:#0f1720;
  --text:#e6eef8;
  --muted:#9aa6b2;
  --accent:#3aa0ff;
  --shadow: none;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;
  background:var(--bg);color:var(--text);padding:18px;line-height:1.4;
}

.site-header{
  display:flex;gap:12px;align-items:center;justify-content:space-between;margin-bottom:12px;
}
.title-wrap{max-width:60%}
.site-title{margin:0;font-size:1.2rem}
.site-sub{margin:4px 0 0 0;color:var(--muted);font-size:0.9rem}

.controls{display:flex;gap:8px;align-items:center}
input[type="search"]{
  padding:8px 10px;border-radius:8px;border:1px solid rgba(0,0,0,0.08);min-width:180px;
  background:transparent;color:var(--text)
}
select{padding:8px;border-radius:8px;border:1px solid rgba(0,0,0,0.08);background:transparent;color:var(--text)}
.btn{background:var(--accent);color:white;border:none;padding:8px 10px;border-radius:8px;cursor:pointer}
.btn.small{padding:6px 8px;font-size:0.9rem}
.btn:active{transform:translateY(1px)}

.container{display:grid;grid-template-columns:1fr 260px;gap:20px;align-items:start}
@media (max-width:900px){ .container{grid-template-columns:1fr} .sidebar{order:2} }

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:var(--gap);align-items:start}

.card{
  background:var(--card);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow);
  display:flex;flex-direction:column;min-height:140px;outline:none;border:1px solid transparent;
}
.card:focus{box-shadow:0 6px 18px rgba(11,132,255,0.18);border-color:rgba(11,132,255,0.18)}
.card header{display:flex;justify-content:space-between;align-items:center}
.card-title{margin:0;font-size:1rem}
.meta{color:var(--muted);font-size:0.85rem;margin-top:6px}

.card-body{margin-top:10px;flex:1}
.steps{padding-left:1.1rem;margin:6px 0}
.materials{margin:6px 0;color:var(--muted);font-size:0.95rem}
.tip{margin:6px 0;color:var(--accent)}

.card-footer{display:flex;justify-content:space-between;align-items:center;margin-top:10px}
.tags{font-size:0.85rem;color:var(--muted)}
.tags .tag{background:rgba(0,0,0,0.04);padding:4px 8px;border-radius:999px;margin-right:6px;font-size:0.8rem}

.actions{display:flex;gap:8px}
.actions .btn{padding:6px 8px;font-size:0.9rem}

.sidebar{background:rgba(255,255,255,0.03);padding:12px;border-radius:8px;height:max-content}
.toc{list-style:none;padding:0;margin:6px 0}
.toc li{margin:6px 0;font-size:0.95rem;color:var(--muted)}
.site-footer{margin-top:18px;color:var(--muted);font-size:0.9rem}

/* small collapsed body until expanded (for keyboard navigation) */
.card[aria-expanded="false"] .card-body{display:none}
.card[aria-expanded="true"] .card-body{display:block}

/* related links section */
.related-links{margin-top:12px}
.related-links h3{margin:8px 0 6px 0;font-size:1rem}
.related-links ul{list-style:none;padding:0;margin:0}
.related-links li{margin:6px 0}
.related-links a{color:var(--accent);text-decoration:none}
.related-links a:hover{text-decoration:underline}

/* return to site link */
.return-link{display:block;margin-top:10px;padding:8px;border-radius:8px;background:rgba(11,132,255,0.06);color:var(--accent);text-decoration:none;text-align:center;font-weight:600}
.return-link:hover{background:rgba(11,132,255,0.10)}

/* print */
@media print{
  :root{color-adjust:exact}
  body{padding:6mm;background:white}
  .site-header,.site-footer,.controls,.sidebar,.btn{display:none}
  .grid{grid-template-columns:repeat(2,1fr);gap:6mm}
  .card{box-shadow:none;border:1px solid #ddd;page-break-inside:avoid}
  .card .actions,.card .tags{display:none}
  body, h1, h2, h3, p, li{font-family: var(--print-font)}
}

/* accessibility focus for buttons */
button:focus{outline:3px solid rgba(11,132,255,0.18);outline-offset:2px}