@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');
:root{--brand:#1e40af;--brand2:#3b82f6;--accent:#ea580c;--ink:#1e293b;--mut:#64748b;--bg:#f8fafc;--card:#fff;--line:#e2e8f0;--success:#10b981;--warning:#f59e0b}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
a{color:var(--brand);text-decoration:none;transition:color .2s}a:hover{color:var(--brand2);text-decoration:underline}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
header.site{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;padding:16px 0;box-shadow:0 2px 8px rgba(0,0,0,.1);position:sticky;top:0;z-index:100}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.logo{font-weight:800;font-size:22px;letter-spacing:-.5px;color:#fff;display:flex;align-items:center;gap:8px}
.logo:hover{text-decoration:none;color:#fff}
.nav{display:flex;gap:20px;flex-wrap:wrap;font-size:14px;font-weight:600}
.nav a{color:rgba(255,255,255,.9);padding:6px 0;border-bottom:2px solid transparent;transition:all .2s}
.nav a:hover{color:#fff;border-color:#fff;text-decoration:none}
.hero{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;padding:50px 0 60px;margin-top:-1px}
.hero h1{font-size:clamp(32px,5vw,48px);font-weight:800;letter-spacing:-1px;margin-bottom:12px;line-height:1.1}
.hero p{font-size:18px;opacity:.95;max-width:700px;margin-bottom:24px;line-height:1.6}
.search{display:flex;max-width:600px;background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 12px rgba(0,0,0,.15)}
.search input{flex:1;padding:16px 20px;border:0;font-size:16px;outline:none}
.search button{background:var(--accent);color:#fff;padding:16px 28px;border:0;font-weight:700;cursor:pointer;transition:background .2s}
.search button:hover{background:#c2410c}
main{padding:40px 0 60px}
h1{font-size:clamp(28px,4vw,40px);font-weight:800;letter-spacing:-.5px;margin-bottom:8px;line-height:1.2}
h2{font-size:24px;font-weight:700;letter-spacing:-.3px;margin:40px 0 16px}
h3{font-size:20px;font-weight:700;margin:30px 0 12px}
.lead{font-size:18px;color:var(--mut);margin-bottom:24px;line-height:1.6}
.crumbs{font-size:13px;color:var(--mut);margin-bottom:16px}
.crumbs a{color:var(--mut)}
.crumbs a:hover{color:var(--brand)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin:20px 0}
.tile{background:var(--card);border:2px solid var(--line);border-radius:12px;padding:18px;display:block;transition:all .2s}
.tile:hover{border-color:var(--brand);box-shadow:0 6px 20px rgba(30,64,175,.15);transform:translateY(-2px);text-decoration:none}
.tile b{display:block;color:var(--ink);font-size:16px;font-weight:700;margin-bottom:4px}
.tile small{color:var(--mut);font-size:13px}
.cats{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin:30px 0}
.cat{background:var(--card);border:2px solid var(--line);border-radius:12px;padding:20px;display:flex;gap:14px;align-items:center;transition:all .2s}
.cat:hover{border-color:var(--brand);box-shadow:0 6px 20px rgba(30,64,175,.15);text-decoration:none}
.cat .ic{font-size:32px}
.cat b{color:var(--ink);font-size:16px;font-weight:700;display:block;margin-bottom:2px}
.cat small{color:var(--mut);font-size:13px}
.layout{display:grid;grid-template-columns:1fr 340px;gap:32px;margin-top:30px}
@media(max-width:900px){.layout{grid-template-columns:1fr}}
.bigwt{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border-radius:16px;padding:28px;margin:24px 0;box-shadow:0 4px 16px rgba(30,64,175,.2)}
.bigwt .k{font-size:36px;font-weight:800;letter-spacing:-.5px;margin-bottom:6px}
.bigwt .s{opacity:.9;font-size:15px}
.specs{width:100%;border-collapse:collapse;margin:20px 0;background:var(--card);border:2px solid var(--line);border-radius:12px;overflow:hidden}
.specs td,.specs th{padding:14px 16px;border-bottom:1px solid var(--line);font-size:15px;vertical-align:top;text-align:left}
.specs tr:last-child td{border-bottom:0}
.specs th{background:#f1f5f9;font-size:13px;text-transform:uppercase;letter-spacing:.5px;color:var(--mut);font-weight:700}
.specs td:first-child{font-weight:700;background:#f8fafc;color:var(--ink);width:40%}
.calc{background:#fef3c7;border:2px solid #fbbf24;border-radius:14px;padding:24px;margin:28px 0}
.calc h3{margin:0 0 16px;font-size:20px;display:flex;align-items:center;gap:8px}
.calc label{display:inline-block;font-size:14px;font-weight:600;margin:0 16px 12px 0;color:var(--ink)}
.calc input{display:block;margin-top:6px;padding:10px 14px;border:2px solid var(--line);border-radius:8px;font-size:15px;width:160px;transition:border-color .2s}
.calc input:focus{border-color:var(--brand);outline:none}
.calc .note{font-size:13px;color:var(--mut);margin:8px 0 0}
.box{background:var(--card);border:2px solid var(--line);border-radius:12px;padding:20px;margin:20px 0}
.box p{margin-bottom:12px}
.box p:last-child{margin-bottom:0}
.warn{background:#fef2f2;border:2px solid #fca5a5;border-radius:12px;padding:18px 20px;margin:20px 0;font-size:14px;color:#991b1b;line-height:1.6}
.faq{margin:30px 0}
.faq dt{font-weight:700;margin:18px 0 6px;font-size:16px;color:var(--ink)}
.faq dd{margin:0 0 12px;color:var(--mut);line-height:1.6}
.side .w{background:var(--card);border:2px solid var(--line);border-radius:12px;padding:20px;margin-bottom:20px}
.side h4{margin:0 0 12px;font-size:16px;font-weight:700}
.side a{display:block;padding:8px 0;font-size:14px;border-bottom:1px solid var(--line);transition:color .2s}
.side a:last-child{border-bottom:0}
.side a:hover{color:var(--brand);text-decoration:none}
.tool-section{background:var(--card);border:2px solid var(--line);border-radius:16px;padding:32px;margin:30px 0}
.tool-section h2{margin-top:0}
.tool-input,.tool-select{width:100%;padding:12px 16px;border:2px solid var(--line);border-radius:10px;font-size:15px;margin-bottom:16px;transition:border-color .2s}
.tool-input:focus,.tool-select:focus{border-color:var(--brand);outline:none}
.tool-btn{padding:14px 28px;background:var(--brand);color:#fff;border:0;border-radius:10px;font-size:15px;font-weight:700;cursor:pointer;transition:all .2s;box-shadow:0 2px 8px rgba(30,64,175,.2)}
.tool-btn:hover{background:var(--brand2);transform:translateY(-1px);box-shadow:0 4px 12px rgba(30,64,175,.3)}
.tool-result{margin-top:24px;padding:24px;background:#f1f5f9;border:2px solid var(--line);border-radius:12px;font-size:15px;line-height:1.6}
.content-section{margin:30px 0}
.content-section p{margin-bottom:14px;line-height:1.7}
.content-section ul,.content-section ol{margin:14px 0;padding-left:28px}
.content-section li{margin-bottom:8px;line-height:1.6}
footer{border-top:2px solid var(--line);padding:40px 0;color:var(--mut);font-size:14px;background:#fff;margin-top:60px}
footer p{margin-bottom:8px}
@media(max-width:768px){.hero{padding:40px 0 50px}.hero h1{font-size:32px}.grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}.layout{gap:20px}.tool-section{padding:20px}}
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.tile,.cat,.tool-section{animation:fadeIn .3s ease}