/* シンプルで読みやすいスタイル（変更可） */
:root{
  --accent:#0b66c2;
  --bg:#ffffff;
  --text:#1b1b1b;
  --muted:#6b6b6b;
  --card:#f7f9fc;
  --radius:10px;
}
*{box-sizing:border-box}
body{
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  color:var(--text);
  background:var(--bg);
  margin:0;
  line-height:1.6;
}
.container{max-width:980px;margin:28px auto;padding:18px;}
.header{display:flex;align-items:center;gap:12px}
.logo{width:56px;height:56px;border-radius:12px;background:linear-gradient(135deg,var(--accent),#2db6ff);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:18px}
h1{margin:0;font-size:24px}
.nav{margin-top:16px;display:flex;gap:12px;flex-wrap:wrap}
a.navlink{color:var(--accent);text-decoration:none;font-weight:600}
.card{background:var(--card);padding:16px;border-radius:var(--radius);box-shadow:0 6px 20px rgba(20,30,50,0.04);margin-top:18px}
.footer{margin-top:32px;padding-top:18px;border-top:1px solid #eee;color:var(--muted);font-size:14px}
.meta{color:var(--muted);font-size:13px}
.actions{margin-top:12px;display:flex;gap:12px;flex-wrap:wrap}
.btn{background:var(--accent);color:#fff;padding:10px 14px;border-radius:8px;text-decoration:none;font-weight:600}
.btn-ghost{background:transparent;border:1px solid #ddd;padding:8px 12px;border-radius:8px;color:var(--text);text-decoration:none}
.row{display:flex;gap:18px;align-items:flex-start;flex-wrap:wrap}
.screenshot{width:320px;max-width:100%;border-radius:8px;overflow:hidden;border:1px solid #eee}
.section-title{font-size:18px;margin-bottom:8px}
.small{font-size:13px;color:var(--muted)}
.code{background:#fff;padding:10px;border-radius:8px;border:1px dashed #e6e6e6;font-family:monospace;font-size:13px}