:root{
  --bg:#f6f7fb; --card:#fff; --text:#111827; --muted:#6b7280;
  --line:#e5e7eb; --brand:#16a34a; --shadow:0 10px 25px rgba(17,24,39,.06);
  --radius:14px;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text)}
a{color:inherit;text-decoration:none}
.wrap{max-width:1000px;margin:0 auto;padding:18px}
.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.top .wrap{display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:900}
.nav a{color:var(--muted);font-weight:700}
h1{margin:14px 0 6px;font-size:32px}
.sub{margin:0 0 16px;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin:14px 0}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end}
.btn{border:1px solid var(--line);background:#fff;padding:10px 14px;border-radius:12px;font-weight:800;cursor:pointer}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.ghost{background:#fff}
.btn:disabled{opacity:.5;cursor:not-allowed}
.status{margin:12px 0;color:var(--muted);font-weight:800}
.target{display:flex;flex-direction:column;gap:6px}
.lbl{font-size:13px;color:var(--muted);font-weight:800}
.targetRow{display:flex;gap:8px;align-items:center}
#targetVal,#targetUnit{padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:#fff;outline:none}
#targetVal{width:120px}
.preview{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}
.box{border:1px solid var(--line);border-radius:12px;background:#fff;overflow:hidden}
.t{padding:10px 12px;font-weight:900;border-bottom:1px solid var(--line)}
.img{width:100%;aspect-ratio:4/3;object-fit:contain;background:#f9fafb;display:block}
.info{padding:10px 12px;color:var(--muted);font-weight:800}
.guide{margin-top:14px;border-top:1px solid var(--line);padding-top:12px}
.guide h2{margin:0 0 8px;font-size:18px}
.guide ol{margin:0 0 10px;padding-left:18px;color:var(--text)}
.note{margin:0;color:var(--muted);font-weight:700}
@media (max-width:900px){.preview{grid-template-columns:1fr}}