:root{color-scheme:light;--bg:#f3efe7;--paper:#fffdf8;--ink:#22201c;--muted:#686157;--line:#cfc4b3;--accent:#b43d2f;--accent2:#0d6870;--ok:#17633e;--danger:#a52828}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:linear-gradient(135deg,#efe7da 0,#f8f5ef 55%,#e7efed 100%);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif}a{color:var(--accent2)}header,footer{width:min(980px,calc(100% - 32px));margin:auto;display:flex;justify-content:space-between;gap:16px;padding:22px 0;color:var(--muted);font-size:.9rem}header a{color:var(--ink);font-weight:850;text-decoration:none;letter-spacing:.06em}main{width:min(980px,calc(100% - 32px));margin:auto;padding:38px 0 72px}.eyebrow{margin:0;color:var(--accent);font-size:.78rem;font-weight:900;letter-spacing:.14em}h1{max-width:900px;margin:10px 0 16px;font-size:clamp(2.15rem,7vw,4.6rem);line-height:1.04;letter-spacing:-.045em}.lead{max-width:760px;margin:0 0 30px;color:var(--muted);font-size:1.06rem;line-height:1.85}.card{padding:clamp(18px,4vw,32px);background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:0 24px 60px rgba(63,48,31,.12)}h2{margin:0 0 16px;font-size:1.35rem}.formula{margin:0 0 24px;padding:14px 16px;border-left:4px solid var(--accent);background:#f3ece2;line-height:1.7}.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.field{display:grid;align-content:start;gap:8px}.span{grid-column:1/-1}label{font-weight:800}input,select,button{min-height:48px;border-radius:10px;font:inherit}input,select{width:100%;padding:11px 13px;border:1px solid #887d6c;background:#fff;color:var(--ink);font-size:16px}input:focus,select:focus,button:focus-visible{outline:3px solid rgba(13,104,112,.25);outline-offset:2px;border-color:var(--accent2)}input[readonly]{background:#eee9e0;color:#514b43}.hint{margin:0;color:var(--muted);font-size:.9rem;line-height:1.6}.actions{display:grid;grid-template-columns:2fr 1fr;gap:12px;margin-top:22px}button{padding:12px 18px;border:0;background:var(--accent);color:#fff;font-weight:900;cursor:pointer}.secondary{background:#4b4a46}.error{min-height:1.5em;margin:12px 0 0;color:var(--danger);font-weight:800;line-height:1.55}.result{margin-top:24px;padding:22px;background:#f8f3ea;border:1px solid #b9ad9a;border-radius:14px}.metrics{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.metric{padding:16px;background:#fff;border:1px solid #ded5c8;border-radius:10px}.metric-label{margin:0 0 7px;color:var(--muted);font-size:.84rem}.metric-value{margin:0;color:var(--accent2);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:clamp(1rem,2.7vw,1.28rem);font-weight:900;overflow-wrap:anywhere}.conditions{margin:16px 0 0;line-height:1.7}.details{display:grid;gap:8px;margin-top:34px;color:var(--muted);line-height:1.85}.details h2{margin:24px 0 0;color:var(--ink)}.diagram{margin:10px 0;padding:20px;border:1px solid var(--line);background:#fff;border-radius:12px}.bleed-box{padding:18px;background:#f3b2a9}.trim-box{padding:18px;background:#fffdf8;border:2px dashed var(--accent)}.safe-box{padding:16px;border:2px solid var(--accent2);text-align:center;color:var(--accent2);font-weight:800}.sources{font-size:.9rem}.ad-space{margin-top:28px;padding:16px;border:1px dashed #918675;border-radius:10px;text-align:center;color:#786f63;font-size:.88rem}@media(max-width:620px){main{padding-top:22px}.grid,.metrics,.actions{grid-template-columns:1fr}.span{grid-column:auto}.card{padding:17px}header{align-items:flex-start}.metric{padding:14px}}