:root{--bg: #f7f9fb;--surface: #ffffff;--text: #111827;--muted: #6b7280;--accent: #0f172a;--border: #e5e7eb}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}.site-header{max-width:1024px;margin:0 auto;padding:16px 20px;display:flex;align-items:center;justify-content:space-between}.logo{font-weight:700;color:var(--accent);text-decoration:none}.nav{display:flex;gap:16px}.nav a{color:var(--muted);text-decoration:none;font-size:.95rem}main{max-width:1024px;margin:0 auto;padding:24px 20px 80px}.hero{margin-bottom:24px}.hero h1{font-size:clamp(28px,4vw,44px);line-height:1.15;margin:0 0 12px}.lead{font-size:18px;color:var(--muted);margin:0 0 20px}.cta{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:12px 16px;border-radius:6px;font-weight:600}.calculator-section{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:24px;margin-top:16px}.calculator-section h2{margin-top:0}.calculator{max-width:500px}.field{margin-bottom:16px}.label{display:block;font-weight:600;margin-bottom:6px;font-size:.95rem}.input-wrap{display:flex;align-items:center;gap:8px}.input{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:8px;font-size:1rem;background:var(--bg);color:var(--text);outline:none;transition:border-color .15s ease}.input:focus{border-color:var(--accent)}.suffix{color:var(--muted);font-weight:600;font-size:.9rem;min-width:32px}.result{display:block;color:var(--text);font-size:16px;line-height:1.45;min-height:120px;padding:16px;margin-top:16px;border:1px solid var(--border);border-radius:8px;background:#f9fafb}.result-value{font-size:24px;font-weight:700}.result-value .unit{font-size:18px;font-weight:600;color:var(--muted)}.result-meta{color:#4b5563;margin-top:6px;font-size:.95rem}.actions{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}.btn{padding:10px 20px;border:1px solid var(--border);border-radius:8px;font-size:.95rem;font-weight:600;cursor:pointer;transition:background .1s ease,border-color .15s ease}.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.btn.primary:hover{opacity:.9}.btn.secondary{background:var(--surface);color:var(--text)}.btn.secondary:hover{background:var(--bg);border-color:var(--muted)}.content,.faq,.privacy,.site-crosslinks{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:20px;margin-top:16px}.content h2,.faq h2,.privacy h2,.site-crosslinks h2{margin-top:0}.content h3,.faq h3{margin:20px 0 8px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.crosslink-grid{display:flex;flex-wrap:wrap;gap:10px 12px}.crosslink{display:inline-flex;padding:10px 14px;background:#fff;border:1px solid var(--border, #e5e7eb);border-radius:999px;color:var(--text, #111827);box-shadow:0 1px 2px #0000000a;font-weight:600;font-size:.95rem;text-decoration:none;transition:transform .08s ease,border-color .15s ease,box-shadow .15s ease}.crosslink:hover{transform:translateY(-1px);border-color:var(--accent, #2563eb);box-shadow:0 4px 12px #00000014;text-decoration:none;color:var(--text, #111827)}.site-footer{max-width:1024px;margin:0 auto;padding:24px 20px;color:var(--muted);font-size:14px}