:root{--bg:#f7f9fc;--panel:#ffffff;--border:#e3e6eb;--text:#1f2937;--muted:#6b7280;--primary:#2563eb;--primary-hover:#1d4ed8;--accent:#f59e0b;--ok:#10b981;--warn:#ef4444}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,segoe ui,Roboto,helvetica neue,Arial,sans-serif;line-height:1.55}.container{max-width:1080px;margin:0 auto;padding:0 1.2rem}.site-header{background:var(--panel);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}.brand{display:flex;gap:.6rem;align-items:center;text-decoration:none;color:var(--text);font-weight:600}.brand-mark{width:32px;height:32px;border-radius:.45rem;display:inline-block;flex-shrink:0}.main-nav a{margin-left:1.2rem;color:var(--muted);text-decoration:none}.main-nav a:hover{color:var(--primary)}.hero{padding:3rem 0 1rem;text-align:center}.hero h1{font-size:2rem;margin:0 0 .5rem}.hero .lead{color:var(--muted);margin:0}.tool{padding:1rem 0 4rem}.form-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;background:var(--panel);border:1px solid var(--border);border-radius:.7rem;padding:1.4rem;box-shadow:0 1px 2px rgba(15,23,42,4%)}.field{display:flex;flex-direction:column;gap:.35rem}.field label{font-size:.85rem;color:var(--muted)}.field input,.field select{padding:.55rem .7rem;border:1px solid var(--border);border-radius:.5rem;font-size:1rem;background:#fff;color:var(--text)}.field input:focus,.field select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}.field select option:disabled{color:var(--muted);background:#f3f4f6}.hint{color:var(--muted);font-size:.75rem;min-height:1rem}.actions{display:flex;align-items:flex-end;gap:.6rem}.btn-primary,.btn-secondary{padding:.55rem 1rem;border-radius:.5rem;border:1px solid transparent;cursor:pointer;font-weight:600}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-secondary{background:#fff;color:var(--text);border-color:var(--border)}.result{margin-top:1.5rem;background:var(--panel);border:1px solid var(--border);border-radius:.7rem;padding:1.4rem;box-shadow:0 1px 2px rgba(15,23,42,4%)}.result.hidden{display:none}.result h2{margin-top:0}.summary{background:#eff6ff;border:1px solid #bfdbfe;color:#1e3a8a;border-radius:.5rem;padding:.8rem 1rem;margin-bottom:1rem;font-size:.95rem}.summary.warn{background:#fef2f2;border-color:#fecaca;color:#991b1b}.summary ul{margin:.4rem 0 0;padding-left:1.2rem}.data-table{width:100%;border-collapse:collapse;font-size:.92rem}.data-table th,.data-table td{padding:.55rem .7rem;border:1px solid var(--border);text-align:center}.data-table th{background:#f1f5f9;font-weight:600}.data-table tr:nth-child(even) td{background:#f9fafb}.post{padding:2rem 0}.post h1{margin:0 0 .4rem}.meta{color:var(--muted);font-size:.85rem}.content{margin-top:1rem}.site-footer{border-top:1px solid var(--border);background:var(--panel);margin-top:3rem}.site-footer p{color:var(--muted);font-size:.85rem;padding:1.2rem 0;text-align:center}@media(max-width:720px){.form-grid{grid-template-columns:1fr}.actions{flex-direction:row}}