:root{
  --primary:#3520ff;--primary2:#4b27ff;--ink:#111325;--muted:#65708b;
  --border:#ddd9ef;--soft:#f6f4ff;--card:#fff;--green:#08b76b;--orange:#ffb000;
  --shadow:0 8px 24px rgba(38,28,120,.06);--radius:9px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:#fff;color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;line-height:1.45}
a{color:inherit}.container{width:min(100%,1024px);margin:auto;padding:14px 22px 0}
.header{display:grid;grid-template-columns:235px 1fr;gap:28px;align-items:center;margin-bottom:24px}
.brand{text-decoration:none;font-weight:800;font-size:39px;letter-spacing:-2px;color:#2c20db;line-height:1}
.tagline{font-size:21px;letter-spacing:0;color:#74809b;font-weight:600;margin-top:8px}
.ad{border:1px dashed #b8afff;background:linear-gradient(135deg,#fbfaff,#f4f0ff);color:#1714ef;text-align:center;border-radius:8px;display:flex;align-items:center;justify-content:center;flex-direction:column;font-weight:600;min-height:90px;letter-spacing:.2px}
.ad small{font-size:13px;font-weight:500}.ad-300{min-height:388px}.ad-970{min-height:82px}
.top-grid{display:grid;grid-template-columns:185px 1fr 1fr 1.03fr;gap:14px;align-items:stretch}
.card{border:1px solid #d9d4f5;background:linear-gradient(145deg,#fbfaff,#f4f1ff);border-radius:9px;padding:14px;box-shadow:var(--shadow)}
.calc-card h3,.stopwatch h3{margin:0 0 14px;font-size:14px;font-weight:700}
.display{background:#fff;border-radius:6px;padding:10px 12px;min-height:73px;display:flex;flex-direction:column;justify-content:center;margin-bottom:11px;overflow:hidden}
.expression{font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:#202336}
.answer{text-align:right;font-size:17px;font-weight:800;margin-top:6px;white-space:nowrap}
.keys{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.scientific .keys{grid-template-columns:repeat(5,1fr)}
button,.button{font:inherit;border:1px solid #e2deef;background:#fff;border-radius:5px;min-height:42px;cursor:pointer;color:#10121e}
button:hover,.button:hover{border-color:#b7adff;transform:translateY(-1px)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid rgba(53,32,255,.22);outline-offset:2px}
.keys button:last-child{background:var(--primary);color:#fff;border-color:var(--primary)}
.stopwatch{display:flex;flex-direction:column}.timer-face{width:205px;height:205px;border:1px dashed #a9afd0;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:35px auto 38px;font-weight:800;font-size:22px}
.timer-face small{font-size:12px}.actions{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}.actions .start{background:#08b96e;color:#fff;border-color:#08b96e}
.section-title{display:flex;align-items:center;justify-content:center;gap:20px;margin-top:17px}.section-title:before,.section-title:after{content:"";height:2px;background:var(--primary2);width:110px}.section-title h2{font-size:25px;margin:0;text-align:center}
.section-sub{text-align:center;color:#73809a;margin:3px 0 14px}
.related{display:grid;grid-template-columns:repeat(10,1fr);gap:7px}
.calc-link{text-decoration:none;border:1px solid #e2deef;background:#fff;border-radius:7px;min-height:72px;padding:8px 4px 6px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;transition:.16s}
.calc-link:hover{box-shadow:0 5px 16px rgba(45,31,160,.10);border-color:#c8c0ff;transform:translateY(-2px)}
.icon{color:#3825ff;font-size:20px;height:27px;display:flex;align-items:center;justify-content:center;font-weight:800}.calc-link span{font-size:10.5px;line-height:1.18;font-weight:700}
.commerce{display:grid;grid-template-columns:1fr 2.5fr 1fr;gap:14px;margin:14px 0}.commerce .ad-300{min-height:185px}
.amazon{min-height:185px;border-radius:8px;border:1px solid #eadfcf;background:linear-gradient(135deg,#fffaf2,#fff4e6);display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center}
.amazon .logo{font-size:28px;font-weight:800}.amazon .arrow{font-size:30px;line-height:10px;color:#f2a400}.amazon h3{margin:8px 0;font-size:16px}.amazon button{background:#ffb300;border-color:#e59d00;padding:7px 18px;min-height:auto;font-size:12px;font-weight:700}
.footer{padding:14px 0 25px;text-align:center;color:#6c7893;font-size:13px}.footer a{margin:0 12px;text-decoration:none}.footer a:hover{color:var(--primary)}
.calculator-page{padding-bottom:10px}.hero{max-width:820px;margin:10px auto 20px;text-align:center}.hero h1{font-size:34px;letter-spacing:-.8px;margin:8px 0}.hero p{color:#68748f;margin:0 auto;max-width:760px}
.tool-shell{max-width:720px;margin:0 auto 25px;padding:20px;border:1px solid var(--border);background:linear-gradient(145deg,#fbfaff,#f6f3ff);border-radius:12px;box-shadow:var(--shadow)}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.field label{display:block;font-size:12px;font-weight:700;margin-bottom:5px}.field input,.field select,.field textarea{width:100%;padding:11px 12px;border:1px solid #d8d4e6;border-radius:7px;background:#fff;font:inherit}.field textarea{min-height:110px;resize:vertical}
.tool-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:14px}.primary{background:var(--primary);color:#fff;border-color:var(--primary);padding:10px 17px;font-weight:700}.secondary{padding:10px 17px}
.result{margin-top:15px;background:#fff;border:1px solid #e2deef;border-radius:8px;padding:14px;min-height:58px}.result strong{font-size:18px}.result .muted{color:var(--muted);font-size:12px}
.formula{max-width:720px;margin:0 auto 22px;border-left:4px solid #b7aeff;background:#f7f5ff;padding:12px 15px;color:#4d5872}
.content-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;max-width:820px;margin:0 auto}.content-grid section{border-top:1px solid var(--border);padding-top:14px}.content-grid h2{font-size:18px;margin:0 0 7px}.content-grid p,.content-grid li{font-size:13px;color:#5f6b84}
.cookie{position:fixed;left:18px;right:18px;bottom:18px;z-index:20;background:#11162a;color:#fff;border-radius:10px;padding:14px 16px;box-shadow:0 15px 40px rgba(0,0,0,.22);display:flex;align-items:center;justify-content:space-between;gap:15px}.cookie p{margin:0;font-size:12px;color:#e6e9f3}.cookie a{color:#fff}.cookie .actions{display:flex;gap:8px}.cookie button{min-height:auto;padding:8px 14px}.cookie .accept{background:#fff;color:#11162a}.cookie.hidden{display:none}
.search{display:block;width:min(680px,100%);margin:0 auto 18px;padding:12px 13px;border:1px solid #ddd9eb;border-radius:8px;font:inherit}
.badge{display:inline-block;padding:4px 8px;background:#eeeaff;color:#3928ee;border-radius:999px;font-size:11px;font-weight:800}
@media(max-width:900px){.related{grid-template-columns:repeat(5,1fr)}.top-grid{grid-template-columns:1fr 1fr}.top-grid>.ad{display:none}.header{grid-template-columns:1fr}.header .ad{order:2}.commerce{grid-template-columns:1fr}.commerce .ad{display:none}}
@media(max-width:600px){.container{padding:12px}.brand{font-size:31px}.tagline{font-size:16px}.top-grid{grid-template-columns:1fr}.related{grid-template-columns:repeat(3,1fr)}.form-grid,.content-grid{grid-template-columns:1fr}.timer-face{margin:20px auto 25px}.cookie{flex-direction:column;align-items:flex-start}.section-title:before,.section-title:after{width:40px}.section-title h2{font-size:21px}}