:root{--bg:#f7f8fc;--ink:#0f172a;--muted:#667085;--line:#e6e8f0;--primary:#4f46e5;--primary2:#7c3aed;--soft:#eef2ff;--ok:#047857;--err:#b42318;--shadow:0 24px 60px rgba(15,23,42,.10)}
*{box-sizing:border-box}
body{margin:0;background:radial-gradient(900px 500px at 12% -10%,rgba(79,70,229,.14),transparent 60%),var(--bg);color:var(--ink);font:15px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit}
.wrap{max-width:920px;margin:0 auto;padding:0 20px 60px}
header{position:sticky;top:0;z-index:20;backdrop-filter:blur(14px);background:rgba(247,248,252,.82);border-bottom:1px solid rgba(230,232,240,.8)}
.nav{max-width:1040px;margin:0 auto;padding:0 20px;height:64px;display:flex;align-items:center;justify-content:space-between;gap:14px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.mark{width:36px;height:36px;border-radius:11px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;display:grid;place-items:center;font-weight:900}
.brand b{font-size:15px}.brand span{display:block;font-size:11px;color:var(--muted)}
.navlinks{display:flex;gap:16px;flex-wrap:wrap}
.navlinks a{font-size:12.5px;color:#475467;text-decoration:none}.navlinks a:hover{color:var(--primary)}
.eyebrow{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--primary);font-weight:800;margin-top:34px}
h1{font-size:36px;line-height:1.2;letter-spacing:-1.2px;margin:8px 0 10px}
.lead{color:var(--muted);font-size:14.5px;margin:0 0 20px;max-width:700px}
.tool-card{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:18px;margin:18px 0}
label{display:block;font-size:12px;color:#475467;font-weight:600;margin:10px 0 5px}
textarea,input[type=text],input[type=number],select{width:100%;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);padding:10px 12px;font:inherit;outline:none}
textarea{min-height:150px;resize:vertical}
textarea:focus,input:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.10)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.btn{border:1px solid var(--line);background:#fff;color:var(--ink);padding:10px 14px;border-radius:10px;font:inherit;font-size:13px;font-weight:600;cursor:pointer}
.btn:hover{border-color:var(--primary);color:var(--primary)}
.btn.primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;border:0}
.btn.primary:hover{filter:brightness(1.04);color:#fff}
.result{margin-top:12px;background:#f8faff;border:1px solid var(--line);border-radius:12px;padding:12px;font-size:13px;white-space:pre-wrap;word-break:break-word;min-height:44px}
.result.ok{background:#ecfdf5;border-color:#a7f3d0;color:#065f46}
.result.err{background:#fef2f2;border-color:#fecaca;color:#991b1b}
.muted{color:var(--muted);font-size:12px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}
.card{border:1px solid var(--line);background:#fff;border-radius:13px;padding:12px}
.card b{display:block;font-size:13px;margin-bottom:4px}
.card p{margin:0;color:var(--muted);font-size:11.5px;line-height:1.6}
.check{display:flex;align-items:center;gap:7px;font-size:12.5px;color:#475467;margin:6px 0}
.check input{width:15px;height:15px;accent-color:var(--primary)}
.seo{margin-top:26px;border-top:1px solid var(--line);padding-top:18px}
.seo h2{font-size:19px;margin:0 0 8px}
.seo p,.seo li{color:var(--muted);font-size:13px;line-height:1.8}
.seo ul{padding-left:20px}
footer{border-top:1px solid var(--line);margin-top:30px;padding:18px 0 30px;color:var(--muted);font-size:11.5px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
footer a{color:var(--primary);text-decoration:none}
.preview{max-width:100%;border-radius:12px;border:1px solid var(--line);margin-top:10px;display:none}
@media(max-width:760px){.row,.row3,.grid{grid-template-columns:1fr}h1{font-size:29px}.navlinks{display:none}}

.crumbs{font-size:11.5px;color:#98a2b3;margin:0 0 10px;display:flex;gap:6px;flex-wrap:wrap}.crumbs a{color:#667085;text-decoration:none}.crumbs a:hover{color:#4f46e5}