:root{
  --bg:#f7f8fa;--surface:#fff;--ink:#111318;--muted:#737984;--line:#e7e9ed;
  --accent:#5b5ce2;--accent-soft:#eef0ff;--radius:18px;
  --shadow:0 14px 40px rgba(17,19,24,.06)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);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}
a:hover{color:var(--accent)}
.wrap{max-width:1180px;margin:auto;padding:0 28px 80px}
nav{height:76px;display:flex;justify-content:space-between;align-items:center;gap:22px}
.brand{font-size:20px;font-weight:800;letter-spacing:-.7px;color:var(--ink)}
.brand::first-letter{}
.navlinks{display:flex;gap:26px;color:#5d626c;font-size:13px}
nav>a:not(.brand){color:#5d626c;font-size:13px}
.breadcrumb{font-size:12px;color:var(--muted);margin:28px 0 18px}
.hero{padding:48px 0 34px;text-align:left}
.hero h1{font-size:clamp(40px,5.5vw,64px);line-height:1;letter-spacing:-3px;margin:0 0 15px;max-width:850px}
.sub{color:var(--muted);max-width:700px;font-size:16px;line-height:1.7;margin:0}
.grid{display:grid;grid-template-columns:370px 1fr;gap:0;background:var(--surface);border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:var(--shadow)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:var(--shadow)}
.grid>.card{border:0;border-radius:0;box-shadow:none}
.grid>.card:first-child{border-right:1px solid var(--line)}
.grid>.card:nth-child(2){min-width:0}
.card h2{margin:0 0 18px;font-size:16px;letter-spacing:-.3px}
.field{margin-bottom:17px}
label{display:block;font-size:11px;font-weight:750;letter-spacing:.1px;margin:0 0 7px}
input,select,textarea{width:100%;height:46px;padding:0 12px;border:1px solid #d8dbe1;border-radius:10px;font-size:15px;background:#fff;color:var(--ink);outline:none}
input:focus,select:focus,textarea:focus{border-color:#aeb0f4;box-shadow:0 0 0 3px var(--accent-soft)}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
button{border:1px solid var(--line);background:#fff;color:var(--ink);height:44px;padding:0 15px;border-radius:10px;font-weight:700;cursor:pointer}
button.primary{background:var(--ink);color:#fff;border-color:var(--ink)}
button:hover{transform:translateY(-1px)}
.results{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.result-card{padding:18px;border:1px solid var(--line);border-radius:13px;background:#fafbfc}
.result-card:first-child{grid-column:1/-1;background:var(--ink);border-color:var(--ink);padding:24px}
.result-card span{display:block;color:var(--muted);font-size:11px}
.result-card:first-child span{color:#aeb2bc}
.result-card strong{display:block;font-size:22px;margin-top:5px;letter-spacing:-.6px}
.result-card:first-child strong{font-size:clamp(34px,5vw,52px);letter-spacing:-2.5px;color:#fff}
.formula,.note{font-size:12px;color:var(--muted);line-height:1.6}
section{margin-top:18px}
section.card{margin-top:18px}
details{border-top:1px solid var(--line);padding:14px 0}
summary{cursor:pointer;font-weight:700;font-size:14px}
footer{margin-top:35px;padding-top:24px;border-top:1px solid var(--line);color:var(--muted);font-size:11px;text-align:center}
ul.tools{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.tools a{display:block;background:#fff;border:1px solid var(--line);border-radius:13px;padding:15px;color:var(--ink);transition:.18s}
.tools a:hover{border-color:#cfd1da;box-shadow:var(--shadow);transform:translateY(-1px)}
.tools strong{font-size:13px}.tools small{display:block;color:var(--muted);margin-top:4px;font-size:11px}
.category-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.category-card{transition:.18s}
.category-card:hover{transform:translateY(-2px)}
.category-card h2{font-size:18px;margin-bottom:7px}
.category-card p{color:var(--muted);font-size:13px;margin:0 0 16px}
.category-card a{font-size:13px;font-weight:700}
.home-hero{text-align:center;padding:78px 0 54px}
.home-hero .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 11px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#606672;font-size:11px;font-weight:700}
.home-hero .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);display:inline-block}
.home-hero h1{margin:20px auto 15px;text-align:center;max-width:850px}
.home-hero .sub{margin:auto;text-align:center}
.search{max-width:620px;margin:28px auto 0}
.search input{height:54px;border-radius:14px;padding-left:18px;box-shadow:0 5px 18px rgba(17,19,24,.04)}
.home-section{margin-top:30px}
.home-section h2{font-size:21px;letter-spacing:-.7px}
.categories{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.cat{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;min-height:142px;transition:.18s}
.cat:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.cat-num{font-size:11px;color:var(--muted);margin-bottom:25px}
.cat h3{margin:0 0 5px;font-size:15px}
.cat p{margin:0;color:var(--muted);font-size:11px;line-height:1.5}
.feature{margin-top:24px;background:var(--ink);color:#fff;border-radius:22px;padding:32px;display:grid;grid-template-columns:1fr auto;gap:25px;align-items:center}
.feature .tag{font-size:10px;text-transform:uppercase;letter-spacing:1.2px;color:#aeb2bc}
.feature h2{margin:7px 0;font-size:28px;letter-spacing:-1px}
.feature p{margin:0;color:#b5bac4;max-width:650px;font-size:13px;line-height:1.6}
.feature a{background:#fff;color:var(--ink);padding:11px 15px;border-radius:10px;font-weight:750;font-size:13px}
@media(max-width:900px){.categories{grid-template-columns:repeat(2,1fr)}.grid{grid-template-columns:1fr}.grid>.card:first-child{border-right:0;border-bottom:1px solid var(--line)}}
@media(max-width:600px){.wrap{padding:0 18px 55px}.navlinks{display:none}.hero{padding:42px 0 27px}.hero h1{letter-spacing:-2.2px}.results,ul.tools,.category-grid{grid-template-columns:1fr}.result-card:first-child{grid-column:auto}.categories{grid-template-columns:1fr}.feature{grid-template-columns:1fr;padding:25px}.home-hero{padding:55px 0 35px}}

.search-status{min-height:18px;margin:8px 4px 0;color:var(--muted);font-size:12px}

.category-eyebrow{display:inline-flex;align-items:center;padding:6px 10px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--muted);font-size:10px;font-weight:750;text-transform:uppercase;letter-spacing:.9px}
.category-intro{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}
.category-intro span{padding:7px 10px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--muted);font-size:11px}
.category-tools{margin-top:0}
.search-results{max-width:720px;margin:18px auto 0;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden;text-align:left}
.search-results-head{display:flex;justify-content:space-between;align-items:center;padding:16px 18px;border-bottom:1px solid var(--line);font-size:12px;font-weight:750}
.search-results-head button{height:32px;padding:0 10px;border-radius:8px;font-size:11px}
#search-results-list{padding:8px}
.search-result{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:14px 12px;border-radius:12px}
.search-result:hover{background:#f7f8fa;color:var(--ink)}
.search-result strong{display:block;font-size:13px}
.search-result small{display:block;color:var(--muted);font-size:11px;margin-top:3px;line-height:1.45}
.search-result .arrow{font-size:18px;color:var(--muted);flex:none}
.search-empty{padding:24px 18px;color:var(--muted);font-size:13px}
@media(max-width:600px){.search-results{margin-top:14px}.search-result{padding:13px 9px}}

.calculator-card{max-width:820px;margin:0 auto}
.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.calc-grid label{display:block;margin-bottom:7px;font-size:12px;font-weight:750}
.calc-grid input{width:100%;box-sizing:border-box}
.advanced{margin-top:22px;border-top:1px solid var(--line);padding-top:18px}
.advanced summary{cursor:pointer;font-size:12px;font-weight:750;color:var(--ink)}
.advanced-grid{margin-top:18px}
.advanced-grid small{display:block;margin-top:6px;color:var(--muted);font-size:10px;line-height:1.45}
.primary{width:100%;margin-top:22px}
.calc-error{margin-top:16px;padding:13px 15px;border:1px solid #e6caca;border-radius:12px;background:#fff7f7;color:#9b3434;font-size:12px;line-height:1.5}
.fire-result{margin-top:24px;padding:26px;border:1px solid var(--line);border-radius:18px;background:#fafbfc}
.result-kicker{font-size:10px;font-weight:800;letter-spacing:1px;text-transform:uppercase;color:var(--muted)}
.fire-headline{margin-top:7px;font-size:clamp(24px,4vw,38px);line-height:1.08;font-weight:800;letter-spacing:-1.2px}
.result-sub{margin-top:8px;color:var(--muted);font-size:13px}
.result-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:22px}
.result-grid>div{padding:14px;border:1px solid var(--line);border-radius:12px;background:#fff}
.result-grid span{display:block;color:var(--muted);font-size:10px}
.result-grid strong{display:block;margin-top:5px;font-size:15px}
.result-note{margin-top:14px;color:var(--muted);font-size:11px;line-height:1.5}
.info-card{max-width:820px;margin:18px auto 0}
@media(max-width:680px){.calc-grid,.result-grid{grid-template-columns:1fr}.fire-result{padding:20px}}