:root{--bg:#07111f;--panel:#0c1a2c;--panel2:#10233a;--text:#ecf4ff;--muted:#8fa7c2;--line:#203955;--accent:#57c8ff;--accent2:#6ee7b7;--shadow:0 18px 50px rgba(0,0,0,.28)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 80% -20%,#12385a 0,transparent 35%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55}a{color:inherit;text-decoration:none}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 max(22px,calc((100vw - 1220px)/2));border-bottom:1px solid var(--line);background:rgba(7,17,31,.88);backdrop-filter:blur(18px);position:sticky;top:0;z-index:30}.brand{display:flex;align-items:center;gap:12px}.brandmark{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;background:linear-gradient(145deg,var(--accent),#2678d9);font-weight:900;color:#04101d;box-shadow:0 8px 28px rgba(87,200,255,.25)}.brand b{display:block;font-size:17px;letter-spacing:.2px}.brand small{display:block;color:var(--muted);font-size:11px}.topbar nav{display:flex;gap:24px;align-items:center}.topbar nav a{color:var(--muted);font-size:14px}.topbar nav a:hover{color:var(--text)}.theme,.menu-btn{border:1px solid var(--line);background:var(--panel);color:var(--text);border-radius:10px;padding:8px 11px;cursor:pointer}.menu-btn{display:none}.shell{max-width:1220px;margin:auto;padding:34px 22px 60px}.hero{display:grid;grid-template-columns:1.45fr .75fr;gap:28px;align-items:center;padding:48px 0 34px}.eyebrow{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent2);font-weight:800}.hero h1{font-size:clamp(38px,6vw,72px);line-height:.98;margin:10px 0 18px;letter-spacing:-.045em;max-width:800px}.hero p{font-size:18px;color:var(--muted);max-width:720px}.hero-stat{background:linear-gradient(150deg,var(--panel2),var(--panel));border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:var(--shadow)}.hero-stat strong{font-size:54px;display:block}.hero-stat span{color:var(--muted)}.search{position:relative;margin:14px 0 28px}.search input{width:100%;background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:16px;padding:17px 18px 17px 48px;font-size:16px;outline:none}.search:before{content:'⌕';position:absolute;left:18px;top:10px;font-size:28px;color:var(--muted)}.category{margin:36px 0}.category-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:14px}.category h2{margin:0;font-size:22px}.category-head span{color:var(--muted);font-size:13px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.tool-card{background:linear-gradient(145deg,var(--panel),#0b1828);border:1px solid var(--line);border-radius:17px;padding:19px;min-height:145px;transition:.18s ease;position:relative;overflow:hidden}.tool-card:after{content:'→';position:absolute;right:18px;bottom:15px;color:var(--accent);font-size:20px}.tool-card:hover{transform:translateY(-3px);border-color:#326489;box-shadow:0 15px 35px rgba(0,0,0,.2)}.tool-card b{font-size:16px}.tool-card p{font-size:13px;color:var(--muted);margin:8px 25px 0 0}.hidden{display:none!important}.ad-wrap{margin:26px 0;text-align:center}.ad-label{font-size:9px;letter-spacing:.18em;color:#607995;margin-bottom:6px}.ad-slot{min-height:100px;border:1px dashed #294560;border-radius:14px;background:rgba(11,27,45,.52);display:grid;place-items:center;color:#5d7690;font-size:12px}.ad-slot[data-ad-slot="sidebar"]{min-height:280px}.calculator-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:26px;align-items:start}.calc-main{min-width:0}.breadcrumbs{font-size:12px;color:var(--muted);margin:8px 0 18px}.breadcrumbs a{color:var(--accent)}.calc-hero{margin-bottom:22px}.calc-hero h1{font-size:clamp(32px,5vw,52px);letter-spacing:-.035em;margin:5px 0 10px}.calc-hero p{color:var(--muted);font-size:17px}.calc-box{background:linear-gradient(145deg,var(--panel),#0a1726);border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:var(--shadow)}.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.field label{display:block;color:var(--muted);font-size:12px;font-weight:700;margin-bottom:7px}.input-wrap{display:flex;border:1px solid var(--line);border-radius:12px;background:#071522;overflow:hidden}.input-wrap input{width:100%;border:0;outline:0;padding:13px;background:transparent;color:var(--text);font-size:16px}.input-wrap span{padding:13px 12px;color:var(--muted);font-size:12px;border-left:1px solid var(--line);white-space:nowrap}.calc-btn{margin-top:18px;border:0;background:linear-gradient(135deg,var(--accent),#2d8ee8);color:#04101c;font-weight:900;padding:13px 18px;border-radius:12px;cursor:pointer;font-size:14px}.results{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:10px;margin-top:20px}.result{padding:15px;border-radius:14px;background:#081725;border:1px solid var(--line)}.result small{display:block;color:var(--muted);font-size:10px;text-transform:uppercase;letter-spacing:.1em;margin-bottom:4px}.result strong{font-size:18px}.result.primary strong{font-size:28px;color:var(--accent)}.info-card{margin:22px 0;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:20px}.info-card h2{margin:0 0 8px;font-size:18px}.info-card p,.info-card li{color:var(--muted);font-size:14px}.sidebar{position:sticky;top:100px}.side-card{background:var(--panel);border:1px solid var(--line);border-radius:17px;padding:18px;margin-bottom:16px}.side-card h3{font-size:14px;margin:0 0 8px}.side-card p{font-size:12px;color:var(--muted);margin:0}.related{display:flex;flex-direction:column;gap:8px}.related a{font-size:13px;color:var(--muted);padding:9px;border-radius:9px;background:#091827}.related a:hover{color:var(--text)}footer{border-top:1px solid var(--line);max-width:1220px;margin:auto;padding:36px 22px 50px;color:var(--muted);display:grid;grid-template-columns:1fr auto;gap:16px}footer b{color:var(--text)}footer p{margin:4px 0}.footer-links{display:flex;gap:15px;font-size:12px}.fine{font-size:11px;grid-column:1/-1;max-width:800px}.content-page{max-width:820px}.content-page h1{font-size:44px}.content-page p,.content-page li{color:var(--muted)}.badge{display:inline-flex;padding:5px 8px;border-radius:999px;background:#0d2b3b;color:var(--accent2);font-size:10px;font-weight:800;letter-spacing:.08em}.notice{border-left:3px solid #e7b955;background:#2a2414;padding:12px 14px;border-radius:0 10px 10px 0;color:#d8cfb6;font-size:12px;margin-top:18px}body.light{--bg:#eef4fa;--panel:#ffffff;--panel2:#f7fbff;--text:#122033;--muted:#61748a;--line:#d5e0ea;--shadow:0 15px 40px rgba(40,70,100,.11);background:#eef4fa}.light .topbar{background:rgba(238,244,250,.9)}.light .input-wrap,.light .result{background:#f7fbff}.light .tool-card{background:#fff}.light .related a{background:#f4f8fb}.light .ad-slot{background:#f5f8fb}
@media(max-width:900px){.grid{grid-template-columns:repeat(2,1fr)}.calculator-layout{grid-template-columns:1fr}.sidebar{position:static}.sidebar .ad-wrap{display:none}.hero{grid-template-columns:1fr}.hero-stat{display:none}}@media(max-width:620px){.topbar nav a{display:none}.menu-btn{display:none}.shell{padding:22px 14px 44px}.hero{padding:28px 0 18px}.hero h1{font-size:44px}.grid{grid-template-columns:1fr}.fields,.results{grid-template-columns:1fr}.calc-box{padding:17px}.result.primary strong{font-size:24px}footer{grid-template-columns:1fr}.footer-links{flex-wrap:wrap}}

/* Safety and input-validation states */
.safety-warning{display:none;margin:12px 0;padding:12px 14px;border:1px solid #8a6326;border-radius:10px;background:rgba(138,99,38,.14);color:var(--text);font-size:13px;line-height:1.45}.safety-warning.show{display:block}.safety-strip{margin:0 0 18px;padding:11px 14px;border:1px solid var(--line);border-radius:10px;background:rgba(255,255,255,.025);font-size:12px;color:var(--muted)}.safety-strip strong{color:var(--text)}

/* Production usability pass */
.skip-link{position:absolute;left:-999px;top:8px;background:var(--text);color:var(--bg);padding:9px 12px;border-radius:8px;z-index:100}.skip-link:focus{left:8px}.calc-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:14px}.calc-actions button,.utility-btn{border:1px solid var(--line);background:transparent;color:var(--muted);padding:9px 12px;border-radius:10px;cursor:pointer;font:inherit;font-size:12px}.calc-actions button:hover,.utility-btn:hover{color:var(--text);border-color:#326489}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:var(--text);color:var(--bg);padding:10px 14px;border-radius:999px;font-size:12px;font-weight:800;transition:.2s;z-index:100}.toast.show{opacity:1;transform:translate(-50%,0)}.method-card{border-top:1px solid var(--line);margin-top:18px;padding-top:16px}.formula{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#071522;border:1px solid var(--line);border-radius:10px;padding:10px 12px;overflow:auto;color:var(--accent2);font-size:12px}.light .formula{background:#f7fbff}.source-links{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.source-links a{font-size:12px;color:var(--accent);border:1px solid var(--line);border-radius:999px;padding:6px 9px}.recent-section{margin:24px 0}.recent-row{display:flex;gap:8px;flex-wrap:wrap}.recent-chip{padding:8px 11px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:12px;background:var(--panel)}#searchCount{display:block;min-height:20px;margin-top:7px;color:var(--muted);font-size:12px}.trust-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:12px 0 30px}.trust-card{padding:13px 15px;border:1px solid var(--line);border-radius:14px;background:var(--panel);font-size:12px;color:var(--muted)}.trust-card b{display:block;color:var(--text);margin-bottom:2px}.source-table{width:100%;border-collapse:collapse;font-size:13px}.source-table th,.source-table td{text-align:left;vertical-align:top;padding:10px;border-bottom:1px solid var(--line)}.source-table th{color:var(--text)}.source-table td{color:var(--muted)}:focus-visible{outline:3px solid var(--accent);outline-offset:3px}@media(max-width:620px){.trust-row{grid-template-columns:1fr}.calc-actions button{flex:1}.source-table{display:block;overflow-x:auto}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}