:root{--navy:#0b2f6b;--blue:#1355a6;--orange:#f47b20;--ink:#162033;--muted:#68758a;--bg:#f6f8fc;--card:#fff;--line:#e3e8f0;--success:#147a45;--danger:#b42318;--shadow:0 10px 35px rgba(20,45,80,.08)}
*{box-sizing:border-box}@media (prefers-reduced-motion: no-preference){html{scroll-behavior:smooth}}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}a{color:inherit}button,input,textarea,select{font:inherit}.bt-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.bt-nav{max-width:1240px;margin:auto;padding:13px 22px;display:flex;align-items:center;gap:26px}.bt-brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;color:var(--navy)}.bt-brand img{width:145px;max-height:48px;object-fit:contain}.bt-brand span{border-left:1px solid #dbe2eb;padding-left:11px;font-size:14px}.bt-navlinks{display:flex;gap:20px;margin-left:auto}.bt-navlinks a{text-decoration:none;color:#3e4c63;font-size:14px;font-weight:650}.bt-navlinks a:hover{color:var(--orange)}.bt-menu{display:none;border:0;background:none;color:var(--navy)}.bt-container{max-width:1240px;margin:auto;padding:0 22px}.bt-hero{padding:78px 0 64px;background:radial-gradient(circle at 80% 10%,#dfeeff 0,#f6f8fc 35%,#f6f8fc 100%);border-bottom:1px solid var(--line)}.bt-kicker{color:var(--orange);font-size:12px;font-weight:850;letter-spacing:.14em}.bt-hero h1{font-size:clamp(38px,6vw,66px);line-height:1.02;max-width:800px;color:var(--navy);margin:13px 0 18px;letter-spacing:-.04em}.bt-hero p{max-width:700px;font-size:18px;line-height:1.65;color:var(--muted);margin:0 0 28px}.bt-search{max-width:680px;position:relative}.bt-searchbox{height:54px;background:#fff;border:1px solid #ccd6e3;border-radius:12px;display:flex;align-items:center;padding:0 16px;gap:10px;box-shadow:0 8px 25px rgba(20,45,80,.06)}.bt-searchbox input{border:0;outline:0;width:100%;background:transparent}.bt-search-results{position:absolute;top:61px;left:0;right:0;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);overflow:hidden;display:none;z-index:10}.bt-search-results a{display:block;padding:12px 15px;text-decoration:none;border-bottom:1px solid #f0f2f5}.bt-search-results a:last-child{border:0}.bt-search-results a:hover{background:#f7f9fc}.bt-search-results small{display:block;color:var(--muted);margin-top:3px}.bt-section{padding:52px 0}.bt-section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:22px}.bt-section-head h2{margin:5px 0 0;color:var(--navy);font-size:30px}.bt-section-head a{color:var(--orange);text-decoration:none;font-weight:750}.bt-cats{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:28px}.bt-chip{border:1px solid var(--line);background:#fff;color:#34445d;border-radius:999px;padding:8px 13px;cursor:pointer;font-weight:650;font-size:13px}.bt-chip.active,.bt-chip:hover{background:var(--navy);color:#fff;border-color:var(--navy)}.bt-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.bt-card{display:flex;flex-direction:column;min-height:180px;padding:21px;border:1px solid var(--line);border-radius:14px;background:#fff;text-decoration:none;box-shadow:0 1px 0 rgba(20,45,80,.02);transition:.18s}.bt-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#cad7e7}.bt-icon{width:42px;height:42px;border-radius:10px;background:#edf4ff;color:var(--blue);display:grid;place-items:center;font-weight:850;margin-bottom:16px}.bt-card h3{margin:0 0 8px;color:var(--navy);font-size:17px}.bt-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.55}.bt-card-footer{margin-top:auto;padding-top:16px;color:var(--orange);font-size:13px;font-weight:750}.bt-footer{background:#0a244c;color:#cbd6e6;margin-top:30px;padding:42px 0}.bt-footer-inner{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}.bt-footer a{color:#fff;text-decoration:none;margin-right:16px;font-size:13px}.bt-page{padding:38px 0 80px}.bt-crumbs{font-size:13px;color:#778398;margin-bottom:30px}.bt-crumbs a{color:var(--blue);text-decoration:none}.bt-tool-header{max-width:820px}.bt-tool-header h1{color:var(--navy);font-size:clamp(34px,5vw,48px);line-height:1.08;letter-spacing:-.03em;margin:9px 0 12px}.bt-tool-header p{font-size:17px;color:var(--muted);line-height:1.65}.bt-workspace{margin-top:28px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:27px;box-shadow:var(--shadow);max-width:820px}.bt-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.bt-field{display:block;font-weight:700;color:#283750}.bt-field.full{grid-column:1/-1}.bt-field input,.bt-field textarea,.bt-field select{width:100%;margin-top:7px;padding:12px 13px;border:1px solid #cbd5e1;border-radius:9px;outline:0;background:#fff}.bt-field input:focus,.bt-field textarea:focus,.bt-field select:focus{border-color:var(--blue);box-shadow:0 0 0 3px #1355a613}.bt-actions{display:flex;gap:10px;margin-top:19px;flex-wrap:wrap}.bt-btn{border:0;border-radius:9px;padding:12px 18px;background:var(--orange);color:#fff;font-weight:800;cursor:pointer}.bt-btn.secondary{background:#edf2f8;color:var(--navy)}.bt-btn:disabled{opacity:.5;cursor:not-allowed}.bt-result{margin-top:20px;border-radius:11px;padding:17px;background:#f0f9f4;border:1px solid #c9e7d5;color:#175a35}.bt-result.error{background:#fff5f4;border-color:#f2c8c4;color:var(--danger)}.bt-result h3{margin:0 0 10px}.bt-result pre{white-space:pre-wrap;word-break:break-word;margin:0;font:14px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace}.bt-note{font-size:12px;color:var(--muted);margin-top:12px}.bt-content{max-width:820px;color:#4e5b70;line-height:1.75}.bt-content h2{color:var(--navy);margin-top:38px}.bt-related{display:flex;flex-wrap:wrap;gap:8px}.bt-related a{border:1px solid var(--line);background:#fff;color:var(--blue);text-decoration:none;padding:8px 10px;border-radius:8px;font-size:13px}.bt-ad{max-width:820px;margin:28px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:25px;text-align:center;color:#9aa5b4;font-size:10px;letter-spacing:.12em}.bt-file{border:2px dashed #c9d4e2;border-radius:12px;padding:25px;text-align:center;background:#fbfcfe}.bt-file input{margin:0 auto;display:block}.bt-preview{max-width:100%;max-height:340px;border-radius:10px;display:block;margin:18px auto 0}.bt-droptext{color:var(--muted);font-size:14px}.bt-stat{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px}.bt-stat div{padding:12px;border:1px solid var(--line);border-radius:9px;background:#fafbfc}.bt-stat b{display:block;color:var(--navy)}.bt-stat span{font-size:12px;color:var(--muted)}.bt-two-col{display:grid;grid-template-columns:1fr 1fr;gap:22px}.bt-code{font:13px/1.55 ui-monospace,SFMono-Regular,Consolas,monospace;min-height:280px}.bt-page-note{background:#fff8ee;border:1px solid #f2d5af;border-radius:10px;padding:12px 14px;color:#72501d;font-size:13px;max-width:820px;margin-top:18px}
@media(max-width:900px){.bt-grid{grid-template-columns:1fr 1fr}.bt-navlinks{display:flex;flex-wrap:wrap;gap:12px;margin-left:auto}.bt-navlinks a{font-size:13px;padding:6px 0}.bt-form-grid,.bt-two-col{grid-template-columns:1fr}}
@media(max-width:600px){.bt-container{padding:0 16px}.bt-hero{padding:55px 0 45px}.bt-grid{grid-template-columns:1fr}.bt-section{padding:40px 0}.bt-section-head{align-items:start;flex-direction:column}.bt-workspace{padding:19px}.bt-stat{grid-template-columns:1fr}.bt-brand img{width:125px}.bt-navlinks{gap:10px}.bt-navlinks a{font-size:12px}.bt-nav{padding:10px 16px}}
.bt-result pre{white-space:pre-wrap;word-break:break-word;overflow-x:auto}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:2px;border-radius:4px}
.bt-visits{color:#5a6b84;font-weight:700}.bt-visits b{color:var(--navy)}