:root{--ink:#162033;--muted:#5f6b7d;--line:#e3e8ef;--soft:#f5f7fb;--brand:#3157d5;--brand2:#edf1ff;--white:#fff;--max:1120px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.72}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto}
.container{max-width:var(--max);margin:auto;padding:0 22px}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.logo{font-size:22px;font-weight:850;letter-spacing:-.6px}
.nav nav{display:flex;align-items:center;gap:18px;font-size:14px;color:#435066}
.nav nav a:hover{color:var(--brand)}
.nav .nav-cta{background:var(--brand);color:#fff;padding:8px 12px;border-radius:8px;font-weight:750}
.hero{padding:76px 0 66px;background:linear-gradient(180deg,#f7f9ff 0%,#fff 100%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:50px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--brand);font-weight:800;font-size:13px;letter-spacing:.2px}
.hero h1{font-size:56px;line-height:1.06;letter-spacing:-2.6px;margin:14px 0 18px;max-width:720px}
.hero p{font-size:19px;color:var(--muted);max-width:700px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0 14px}
.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--brand);background:var(--brand);color:#fff;padding:12px 17px;border-radius:9px;font-weight:800;cursor:pointer}
.button.secondary{background:#fff;color:var(--ink);border-color:#ccd4e0}
.hero-note,.meta,.site-note{font-size:13px;color:#6c7686}
.section{padding:60px 0}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:22px}
.section h2{font-size:32px;line-height:1.2;letter-spacing:-.8px;margin:0 0 12px}
.section-intro{color:var(--muted);max-width:760px;margin:0}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid.two{grid-template-columns:repeat(2,1fr)}
.card{border:1px solid var(--line);border-radius:14px;padding:23px;background:#fff;transition:.15s ease}
.card:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(22,32,51,.07);border-color:#cbd4e2}
.card h3{margin:0 0 7px;font-size:19px}
.card p{margin:0;color:var(--muted)}
.tool-card .icon{width:40px;height:40px;display:grid;place-items:center;border-radius:10px;background:var(--brand2);color:var(--brand);font-weight:900;margin-bottom:16px}
.split{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:start}
.note,.callout{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:22px}
.callout{border-left:4px solid var(--brand)}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:22px 0}
.compare-box{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}
.compare-box h3{padding:14px 17px;margin:0;border-bottom:1px solid var(--line);font-size:16px}
.compare-box .stats{padding:14px 17px;color:var(--muted);font-size:14px}
.illustration{border:1px solid var(--line);border-radius:14px;background:#fff;padding:12px;margin:20px 0}
.illustration img{display:block;width:100%;border-radius:8px}
.tool-wrap{padding:54px 0 30px}
.tool-header{max-width:820px}
.tool-header h1{font-size:46px;line-height:1.12;letter-spacing:-1.5px;margin:10px 0 12px}
.tool-header p{font-size:18px;color:var(--muted)}
.breadcrumb{font-size:13px;color:#6c7686}
.toolbox{margin-top:28px;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:0 10px 35px rgba(22,32,51,.06)}
.drop{border:2px dashed #cbd3df;border-radius:12px;padding:44px 20px;text-align:center;background:#fbfcfe;transition:.15s}
.drop.drag{border-color:var(--brand);background:var(--brand2)}
.drop label{cursor:pointer;display:block}
.drop strong{font-size:18px}
.drop input{display:none}
.preview{max-width:100%;max-height:400px;display:block;margin:22px auto;border-radius:10px}
.controls{display:flex;flex-wrap:wrap;gap:14px;align-items:end;margin-top:18px}
.control{display:flex;flex-direction:column;gap:5px;min-width:150px}
.control label{font-size:13px;font-weight:700}
.control input,.control select{padding:10px;border:1px solid #d5dce6;border-radius:8px;font:inherit}
.result{display:none;background:#f3f6fb;border-radius:10px;padding:15px;margin-top:18px}
.result.show{display:block}
.download{display:inline-flex;margin-top:10px;background:var(--brand);color:#fff;padding:10px 14px;border-radius:8px;font-weight:800}
.tool-content,.article{max-width:860px;margin:0 auto;padding:38px 22px 64px}
.tool-content h2,.article h2{font-size:29px;line-height:1.25;letter-spacing:-.5px;margin:42px 0 10px}
.tool-content h3,.article h3{font-size:20px;margin:28px 0 7px}
.tool-content p,.tool-content li,.article p,.article li{color:#465164}
.tool-content .lead,.article .lead{font-size:19px;color:#5c687a}
ul,ol{padding-left:24px}
.table-wrap{overflow:auto;margin:20px 0}
table{width:100%;border-collapse:collapse;min-width:560px}
th,td{text-align:left;padding:12px 13px;border:1px solid var(--line);vertical-align:top}
th{background:#f7f9fc}
.faq{border-top:1px solid var(--line);margin-top:14px}
.faq-item{border-bottom:1px solid var(--line);padding:18px 0}
.faq-item h3{margin:0 0 7px;font-size:18px}
.related{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:20px}
.related a{border:1px solid var(--line);border-radius:12px;padding:16px}
.related strong{display:block;margin-bottom:4px}
footer{border-top:1px solid var(--line);background:#fbfcfe}
.footer{padding:36px 22px;display:flex;justify-content:space-between;gap:30px}
.footer p{color:var(--muted);max-width:480px}
.footer-links{display:flex;gap:18px;flex-wrap:wrap;align-content:flex-start}
.small{font-size:13px;color:#697487}
@media(max-width:820px){
 .nav nav a:not(.nav-cta){display:none}.hero-grid,.split{grid-template-columns:1fr}.hero h1{font-size:43px}.grid{grid-template-columns:1fr}.grid.two,.related,.compare{grid-template-columns:1fr}.footer{flex-direction:column}
}

.skip-link{position:absolute;left:-9999px;top:auto}.skip-link:focus{left:18px;top:12px;z-index:100;background:#fff;border:2px solid var(--brand);padding:9px 12px;border-radius:8px}
.trust-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;width:min(var(--max),calc(100% - 44px));max-width:var(--max);margin:18px auto 0}.trust-item{border:1px solid var(--line);background:#fbfcff;border-radius:12px;padding:14px 15px}.trust-item strong{display:block;font-size:14px;margin-bottom:2px}.trust-item span{display:block;color:var(--muted);font-size:13px;line-height:1.5}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:26px 0}.step{border:1px solid var(--line);border-radius:13px;padding:18px;background:#fff}.step-num{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--brand2);color:var(--brand);font-weight:850;font-size:13px;margin-bottom:10px}.step h3{margin:0 0 5px;font-size:17px}.step p{margin:0;color:var(--muted);font-size:14px}
.quick-box{background:linear-gradient(180deg,#f7f9ff 0%,#fff 100%);border:1px solid #dbe3f0;border-radius:14px;padding:20px;margin:24px 0}.quick-box h2{font-size:21px!important;margin:0 0 8px!important}.quick-box ul{margin:8px 0 0}.quick-box li{margin:5px 0}
.article-meta{font-size:13px;color:#6b7687;margin:12px 0 18px}.figure-caption{font-size:13px;color:#6b7687;margin:8px 4px 0}.tool-note{margin-top:12px;text-align:center;color:#657084;font-size:13px}.tool-note strong{color:#334158}.result.error{background:#fff3f3;color:#8a2f2f;border:1px solid #f0caca}.button:disabled{opacity:.55;cursor:not-allowed}
@media(max-width:820px){.trust-strip,.steps{grid-template-columns:1fr}.tool-content,.article{padding-top:28px}.trust-item{padding:12px 14px}}

.guide-table{width:100%;border-collapse:collapse;margin:1rem 0}.guide-table th,.guide-table td{border:1px solid #d9dee8;padding:.75rem;text-align:left;vertical-align:top}.guide-table th{font-weight:700}.article pre{overflow:auto;background:#f6f8fb;border:1px solid #e2e6ee;border-radius:12px;padding:1rem;line-height:1.5}.article code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}