:root{--ink:#1a1a2e;--accent:#0f4c81;--bg:#ffffff;--soft:#f2f5f9;--line:#dbe3ee;--muted:#5b6577}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);line-height:1.65;background:var(--bg)}
.wrap{max-width:960px;margin:0 auto;padding:0 18px}
header.site{background:var(--ink);color:#fff;position:sticky;top:0;z-index:50}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;padding:12px 18px}
.brand{font-weight:800;font-size:20px;color:#fff;text-decoration:none;display:inline-flex;align-items:center;gap:9px}
.brand img{border-radius:7px;display:block}
.brand span{color:#7fc4ff}
nav.main a{color:#d7e3f4;text-decoration:none;margin-left:18px;font-size:14.5px}
nav.main a:hover{color:#fff}
.hero{background:linear-gradient(135deg,#0f4c81,#1a1a2e);color:#fff;padding:52px 0;text-align:center}
.hero h1{font-size:34px;margin-bottom:10px}
.hero p{color:#c9d8ec;max-width:620px;margin:0 auto 22px}
.searchbox{max-width:520px;margin:0 auto;display:flex}
.searchbox input{flex:1;padding:12px 14px;border:none;border-radius:8px 0 0 8px;font-size:15px}
.searchbox button{padding:12px 20px;border:none;background:#ffb703;color:#1a1a2e;font-weight:700;border-radius:0 8px 8px 0;cursor:pointer;font-size:15px}
h2.section{font-size:23px;margin:38px 0 6px}
p.lead{color:var(--muted);margin-bottom:18px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;margin:16px 0 8px}
.card{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:18px 16px;text-decoration:none;color:var(--ink);display:block;transition:transform .12s}
.card:hover{transform:translateY(-2px);border-color:var(--accent)}
.card .ic{font-size:26px}
.card h3{font-size:16px;margin:8px 0 4px}
.card p{font-size:13.5px;color:var(--muted)}
.toolcard{background:#fff;border:1.5px solid var(--line);border-radius:12px;padding:22px;margin:18px 0;box-shadow:0 2px 10px rgba(15,76,129,.06)}
.toolcard textarea,.toolcard input[type=text],.toolcard input[type=number]{width:100%;padding:11px 12px;border:1.5px solid var(--line);border-radius:8px;font-size:15px;font-family:inherit}
.toolcard textarea{min-height:150px;resize:vertical}
.btn{display:inline-block;background:var(--accent);color:#fff;border:none;padding:11px 22px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;margin:8px 6px 8px 0}
.btn.ghost{background:#fff;color:var(--accent);border:1.5px solid var(--accent)}
.btn:hover{opacity:.92}
.result{background:var(--soft);border:1px dashed var(--accent);border-radius:8px;padding:14px;margin-top:12px;font-size:15px;word-break:break-word}
.stats{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.stat{background:var(--soft);border:1px solid var(--line);border-radius:8px;padding:10px 16px;text-align:center;min-width:110px}
.stat b{display:block;font-size:22px;color:var(--accent)}
.stat span{font-size:12.5px;color:var(--muted)}
.trust{font-size:13.5px;color:var(--muted);margin-top:10px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:10px 0}
.row label{font-size:14px}
select{padding:9px 10px;border:1.5px solid var(--line);border-radius:8px;font-size:14px}
article.content h2{font-size:21px;margin:30px 0 8px;color:var(--ink)}
article.content h3{font-size:17px;margin:22px 0 6px}
article.content p{margin:0 0 12px}
article.content ul,article.content ol{margin:0 0 14px 22px}
article.content li{margin-bottom:6px}
.faq{border:1px solid var(--line);border-radius:10px;margin:10px 0;overflow:hidden}
.faq summary{padding:13px 16px;font-weight:700;cursor:pointer;background:var(--soft);list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq .a{padding:12px 16px;font-size:15px}
.crumb{font-size:13px;color:var(--muted);margin:18px 0 4px}
.crumb a{color:var(--accent);text-decoration:none}
.toc{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin:16px 0}
.toc b{display:block;margin-bottom:6px}
.toc a{color:var(--accent);text-decoration:none;font-size:14.5px}
.related{background:var(--soft);border-radius:10px;padding:18px;margin:26px 0}
.related h3{margin-bottom:8px;font-size:16px}
.related a{color:var(--accent)}
footer.site{background:var(--ink);color:#b9c7dd;margin-top:50px;padding:34px 0}
footer.site .wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px}
footer.site h4{color:#fff;font-size:14px;margin-bottom:8px}
footer.site a{color:#b9c7dd;text-decoration:none;font-size:13.5px;display:block;margin-bottom:5px}
footer.site a:hover{color:#fff}
.copy{text-align:center;font-size:12.5px;color:#7d8ca6;margin-top:22px}
pre.out{background:#10233a;color:#d6e9ff;padding:14px;border-radius:8px;overflow:auto;font-size:13.5px;max-height:320px}
@media(max-width:640px){.hero h1{font-size:25px}nav.main a{margin-left:10px;font-size:13px}.toolcard{padding:15px}}

/* v2 additions */
nav.main{display:flex;gap:18px;align-items:center}
nav.main a{color:#fff;text-decoration:none;font-size:15px}
.navdrop{position:relative}
.navdrop>a{cursor:pointer}
.navdrop-menu{display:none;position:absolute;top:100%;left:-10px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.14);min-width:210px;padding:8px;z-index:50}
.navdrop:hover .navdrop-menu,.navdrop:focus-within .navdrop-menu{display:block}
.navdrop-menu a{display:block !important;color:var(--ink) !important;padding:9px 12px;border-radius:7px;font-size:14.5px}
.navdrop-menu a:hover{background:var(--soft)}
.navdrop-menu a span{display:block;font-size:12px;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.chip{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:7px 16px;font-size:14px;cursor:pointer;color:var(--ink)}
.chip.active,.chip:hover{border-color:var(--accent);color:var(--accent);font-weight:700}
.conv-table{width:100%;border-collapse:collapse;margin:12px 0;font-size:14.5px}
.conv-table th,.conv-table td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.conv-table th{background:var(--soft)}
.conv-table tr:nth-child(even) td{background:#fbfdff}
.pair-list{columns:2;column-gap:26px;font-size:14.5px;margin:10px 0}
.pair-list li{break-inside:avoid;margin-bottom:7px}
.pair-list a{color:var(--accent);text-decoration:none}
@media(max-width:640px){.pair-list{columns:1}nav.main{gap:12px}}