:root{--bg:#f4f6fb;--surface:#fff;--text:#1d2433;--muted:#5c6578;--primary:#3b6ef6;--primary-dark:#2d56c8;--primary-soft:#eef2fe;--accent:#ff9800;--accent-soft:#fff8e7;--border:#e4e8f1;--danger:#d64545;--radius:14px;--radius-sm:9px;--shadow:0 8px 24px #172b6314;--shadow-sm:0 2px 8px #172b630f;--max-width:640px;--max-width-wide:1060px}*{box-sizing:border-box}body{-webkit-font-smoothing:antialiased;background:#f4f6fb;background:var(--bg);color:#1d2433;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6;margin:0}h1{font-size:1.7rem;line-height:1.25;margin:0 0 12px}h2{font-size:1.15rem;margin:24px 0 8px}a{color:#3b6ef6;color:var(--primary)}.navbar{background:#fff;background:var(--surface);border-bottom:1px solid #e4e8f1;border-bottom:1px solid var(--border);box-shadow:0 2px 8px #172b630f;box-shadow:var(--shadow-sm);position:sticky;top:0;z-index:50}.navbar-inner{flex-wrap:wrap;gap:16px;margin:0 auto;max-width:1060px;max-width:var(--max-width-wide);padding:10px 16px}.brand,.navbar-inner{align-items:center;display:flex}.brand{color:#1d2433;color:var(--text);font-size:1.05rem;font-weight:700;gap:8px;text-decoration:none;white-space:nowrap}.brand-icon{font-size:1.3rem}.nav-toggle{background:none;border:1px solid #e4e8f1;border:1px solid var(--border);border-radius:9px;border-radius:var(--radius-sm);color:#1d2433;color:var(--text);cursor:pointer;display:none;font-size:1.2rem;margin-left:auto;padding:4px 10px}.nav-links{display:flex;flex-wrap:wrap;gap:2px;margin-left:auto}.nav-links a{border-radius:9px;border-radius:var(--radius-sm);color:#5c6578;color:var(--muted);font-size:.88rem;font-weight:600;padding:6px 10px;text-decoration:none;transition:background .15s,color .15s}.nav-links a:hover{background:#eef2fe;background:var(--primary-soft);color:#3b6ef6;color:var(--primary)}.nav-links a.active{background:#3b6ef6;background:var(--primary);color:#fff}@media (max-width:860px){.nav-toggle{display:block}.nav-links{display:none;flex-direction:column;gap:4px;padding-top:8px;width:100%}.nav-links.open{display:flex}.nav-links a{font-size:1rem;padding:10px 12px}}.page{margin:0 auto;max-width:640px;max-width:var(--max-width);padding:32px 16px 56px}.page-wide{max-width:1060px;max-width:var(--max-width-wide)}.calc-card{background:#fff;background:var(--surface);border:1px solid #e4e8f1;border:1px solid var(--border);border-radius:14px;border-radius:var(--radius);box-shadow:0 8px 24px #172b6314;box-shadow:var(--shadow);padding:28px 24px}.info-box{background:#eef2fe;background:var(--primary-soft);border-left:4px solid #3b6ef6;border-left:4px solid var(--primary);border-radius:9px;border-radius:var(--radius-sm);color:#5c6578;color:var(--muted);font-size:.95rem;margin:0 0 20px;padding:12px 16px}.fields{gap:14px;margin-bottom:18px}.field,.fields{display:flex;flex-direction:column}.field{gap:5px;text-align:left}.field span{font-size:.85rem;font-weight:600}.field span,.field-hint{color:#5c6578;color:var(--muted)}.field-hint{font-size:.78rem;font-weight:400;line-height:1.4;margin-top:4px}input,select{background:#fff;background:var(--surface);border:1px solid #e4e8f1;border:1px solid var(--border);border-radius:9px;border-radius:var(--radius-sm);color:#1d2433;color:var(--text);font-family:inherit;font-size:1rem;padding:11px 12px;transition:border-color .15s,box-shadow .15s;width:100%}input:focus,select:focus{border-color:#3b6ef6;border-color:var(--primary);box-shadow:0 0 0 3px #3b6ef626;outline:none}.btn{background:#3b6ef6;background:var(--primary);border:none;border-radius:9px;border-radius:var(--radius-sm);color:#fff;cursor:pointer;font-family:inherit;font-size:1rem;font-weight:600;padding:12px 16px;transition:background .15s,transform .1s;width:100%}.btn:hover{background:#2d56c8;background:var(--primary-dark)}.btn:active{transform:scale(.99)}.mode-tabs{background:#f4f6fb;background:var(--bg);border-radius:9px;border-radius:var(--radius-sm);display:flex;flex-wrap:wrap;gap:6px;margin-bottom:18px;padding:4px}.mode-tab{background:#0000;border:none;border-radius:7px;color:#5c6578;color:var(--muted);cursor:pointer;flex:1 1;font-family:inherit;font-size:.87rem;font-weight:600;min-width:120px;padding:8px 10px;transition:background .15s,color .15s}.mode-tab.active,.mode-tab:hover{color:#3b6ef6;color:var(--primary)}.mode-tab.active{background:#fff;background:var(--surface);box-shadow:0 2px 8px #172b630f;box-shadow:var(--shadow-sm)}.result{background:#eef2fe;background:var(--primary-soft);border-radius:9px;border-radius:var(--radius-sm);font-size:1.08rem;margin-top:20px;padding:16px}.result-breakdown{display:flex;flex-direction:column;gap:6px;text-align:left}.error{color:#d64545;color:var(--danger);font-size:.92rem;font-weight:600;margin-top:12px}.fun-fact{background:#fff8e7;background:var(--accent-soft);border-left:4px solid #ff9800;border-left:4px solid var(--accent);border-radius:9px;border-radius:var(--radius-sm);color:#5c6578;color:var(--muted);font-size:.92rem;margin-top:16px;padding:12px 14px;text-align:left}.hero{padding:24px 8px 32px;text-align:center}.hero h1{font-size:2.1rem;margin-bottom:10px}.hero p{color:#5c6578;color:var(--muted);font-size:1.05rem;margin:0 auto;max-width:560px}.calc-grid{grid-gap:16px;display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}.calc-tile{background:#fff;background:var(--surface);border:1px solid #e4e8f1;border:1px solid var(--border);border-radius:14px;border-radius:var(--radius);box-shadow:0 2px 8px #172b630f;box-shadow:var(--shadow-sm);color:#1d2433;color:var(--text);display:block;padding:20px 18px;text-decoration:none;transition:transform .15s,box-shadow .15s,border-color .15s}.calc-tile:hover{border-color:#3b6ef6;border-color:var(--primary);box-shadow:0 8px 24px #172b6314;box-shadow:var(--shadow);transform:translateY(-3px)}.calc-tile-icon{display:block;font-size:1.8rem;margin-bottom:8px}.calc-tile h2{font-size:1.05rem;margin:0 0 6px}.calc-tile p{font-size:.87rem;margin:0}.calc-tile p,.seo-content{color:#5c6578;color:var(--muted)}.seo-content{background:#fff;background:var(--surface);border:1px solid #e4e8f1;border:1px solid var(--border);border-radius:14px;border-radius:var(--radius);font-size:.95rem;margin-top:28px;padding:22px 24px}.seo-content h2{color:#1d2433;color:var(--text);margin-top:18px}.seo-content h2:first-child{margin-top:0}.seo-content-plain{background:#0000;border:none;margin-top:0;padding:0}.ad-slot{margin-top:28px;min-height:90px}.ad-placeholder{align-items:center;background:repeating-linear-gradient(45deg,#f0f2f8,#f0f2f8 12px,#e9ecf5 0,#e9ecf5 24px);border:1px dashed #e4e8f1;border:1px dashed var(--border);border-radius:9px;border-radius:var(--radius-sm);color:#a6adc0;display:flex;font-size:.75rem;font-weight:600;justify-content:center;letter-spacing:.12em;text-transform:uppercase}.footer{background:#fff;background:var(--surface);border-top:1px solid #e4e8f1;border-top:1px solid var(--border);margin-top:24px;padding:20px 16px}.footer-inner{align-items:center;color:#5c6578;color:var(--muted);display:flex;flex-wrap:wrap;font-size:.88rem;gap:12px;justify-content:space-between;margin:0 auto;max-width:1060px;max-width:var(--max-width-wide)}.footer-links{display:flex;gap:16px}.footer-links a{color:#5c6578;color:var(--muted);font-weight:600;text-decoration:none}.footer-links a:hover{color:#3b6ef6;color:var(--primary)}.fade-in,.fun-fact-animate{animation:fadeInMove .45s ease-out forwards;opacity:0;transform:translateY(12px)}@keyframes fadeInMove{to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.fade-in,.fun-fact-animate{animation:none;opacity:1;transform:none}}
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