:root{--bg:#fff;--fg:#171717;--muted:#666;--border:#e5e5e5;--accent:#2563eb}@media (prefers-color-scheme:dark){:root{--bg:#0a0a0a;--fg:#ededed;--muted:#999;--border:#262626;--accent:#60a5fa}}*{box-sizing:border-box}html,body{margin:0;padding:0}body{min-height:100vh;color:var(--fg);background:var(--bg);flex-direction:column;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;display:flex}a{color:var(--accent);text-decoration:none}.nav{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.nav nav{gap:16px;display:flex}.brand{color:var(--fg);font-weight:700}.main{flex:1;width:100%;max-width:860px;margin:0 auto;padding:32px 16px}.footer{text-align:center;color:var(--muted);border-top:1px solid var(--border);padding:16px;font-size:14px}h1{margin:0 0 8px;font-size:2rem}.sub{color:var(--muted);margin:0 0 24px}.grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;display:grid}.card{border:1px solid var(--border);border-radius:12px;padding:20px}.card h3{margin:0 0 4px}.price{margin:8px 0;font-size:1.75rem;font-weight:700}.btn{border:1px solid var(--accent);background:var(--accent);color:#fff;cursor:pointer;border-radius:8px;padding:10px 16px;font-size:15px;font-weight:600;display:inline-block}.btn.secondary{color:var(--accent);background:0 0}textarea,input{border:1px solid var(--border);background:var(--bg);width:100%;color:var(--fg);font:inherit;border-radius:8px;padding:10px}pre.out{white-space:pre-wrap;background:#7f7f7f1a;border-radius:8px;padding:12px}.stack{flex-direction:column;gap:12px;display:flex}.muted{color:var(--muted);font-size:14px}.keybox{word-break:break-all;font-family:ui-monospace,monospace}table{border-collapse:collapse;width:100%}td,th{text-align:left;border-bottom:1px solid var(--border);padding:8px}.err{color:#dc2626}.hero{padding:24px 0 8px}.hero h1{font-size:2.4rem;line-height:1.15}.lede{color:var(--muted);max-width:640px;font-size:1.1rem}.badges{flex-wrap:wrap;gap:8px;margin:12px 0 0;display:flex}.badge{border:1px solid var(--border);color:var(--muted);border-radius:999px;padding:4px 10px;font-size:12px}.demo{border:1px solid var(--border);background:#7f7f7f0a;border-radius:12px;margin:24px 0;padding:20px}.demo h2{margin-top:0}.row{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;display:grid}.field label{color:var(--muted);margin-bottom:4px;font-size:13px;display:block}.days{flex-wrap:wrap;gap:6px;display:flex}.days label{border:1px solid var(--border);cursor:pointer;border-radius:8px;align-items:center;gap:4px;padding:4px 8px;font-size:13px;display:inline-flex}.days input{width:auto}select{border:1px solid var(--border);background:var(--bg);width:100%;color:var(--fg);font:inherit;border-radius:8px;padding:10px}.result{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}.result .big{font-size:1.4rem;font-weight:700}.explain{margin:8px 0 0;padding-left:20px}.explain li{color:var(--muted);font-size:14px}.hp{width:1px;height:1px;position:absolute;left:-10000px;overflow:hidden}.ok{color:#16a34a}details summary{cursor:pointer;color:var(--muted);font-size:14px}.pains li{margin-bottom:8px}.faq dt{margin-top:12px;font-weight:600}.faq dd{color:var(--muted);margin:4px 0 0}.meter{background:#e5e7eb;border-radius:999px;height:10px;overflow:hidden}.meter>span{background:#111;height:100%;display:block}.meter.warn>span{background:#d97706}.meter.full>span{background:#dc2626}.legal{max-width:760px;line-height:1.6}.legal h2{margin-top:28px;font-size:18px}.footer a{color:inherit;margin-right:12px}.notice{border-left:4px solid #d97706}