:root{
  --bg:#f8fafc;
  --surface:#ffffff;
  --surface-soft:#f1f5f9;
  --fg:#0f172a;
  --mut:#475569;
  --brand:#2563eb;
  --brand-2:#06b6d4;
  --brand-dark:#1d4ed8;
  --brand-soft:#eff6ff;
  --line:#e2e8f0;
  --line-strong:#cbd5e1;
  --warning-bg:#fff7ed;
  --warning-line:#fed7aa;
  --warning-fg:#9a3412;
  --nav:#0f172a;
  --nav-2:#111c33;
  --radius:16px;
  --radius-sm:10px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow-md:0 12px 34px rgba(15,23,42,.09);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--fg);background:radial-gradient(circle at 10% 0,#eef6ff 0,rgba(238,246,255,0) 360px),var(--bg);line-height:1.75;font-size:16px;text-rendering:optimizeLegibility}
a{color:var(--brand);text-decoration:none;text-underline-offset:3px}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid rgba(37,99,235,.28);outline-offset:3px;border-radius:8px}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
header.nav{background:linear-gradient(135deg,var(--nav),var(--nav-2));color:#fff;position:sticky;top:0;z-index:10;box-shadow:0 8px 24px rgba(15,23,42,.18)}
header.nav .wrap{display:flex;flex-wrap:wrap;gap:6px 8px;align-items:center;padding:12px 20px}
header.nav a{color:#cbd5e1;font-size:14px;line-height:1.2;padding:8px 10px;border-radius:999px;transition:background .18s ease,color .18s ease,transform .18s ease}
header.nav a.brand{color:#fff;font-weight:800;margin-right:6px;background:rgba(255,255,255,.08)}
header.nav a:hover{color:#fff;text-decoration:none;background:rgba(255,255,255,.09)}
header.nav a.active{color:#fff;font-weight:700;background:linear-gradient(135deg,rgba(37,99,235,.95),rgba(6,182,212,.75));box-shadow:0 8px 18px rgba(37,99,235,.22)}
header.nav a.brand.active{background:linear-gradient(135deg,rgba(37,99,235,.95),rgba(6,182,212,.75))}
header.nav a.nav-dl{color:#fff;font-weight:800;margin-left:8px;background:linear-gradient(135deg,#f59e0b,#f43f5e);box-shadow:0 8px 18px rgba(244,63,94,.32)}
header.nav a.nav-dl:hover{color:#fff;text-decoration:none;background:linear-gradient(135deg,#fbbf24,#fb7185);transform:translateY(-1px)}
header.nav .nav-links{display:flex;flex-wrap:wrap;gap:6px 8px;align-items:center}
header.nav .nav-toggle{display:none;flex-direction:column;justify-content:center;gap:4px;width:38px;height:38px;margin-left:auto;padding:0;border:0;border-radius:10px;background:rgba(255,255,255,.1);cursor:pointer;transition:background .18s ease}
header.nav .nav-toggle:hover{background:rgba(255,255,255,.18)}
header.nav .nav-toggle span{display:block;width:18px;height:2px;background:#fff;border-radius:2px;transition:transform .25s ease,opacity .2s ease}
header.nav.open .nav-toggle span:nth-child(1){transform:translateY(6px) rotate(45deg)}
header.nav.open .nav-toggle span:nth-child(2){opacity:0}
header.nav.open .nav-toggle span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.crumb{font-size:13px;color:var(--mut);padding:18px 20px 0}.crumb a{color:#64748b}.crumb a:hover{color:var(--brand)}
main{padding:12px 0 48px}main.wrap{background:rgba(255,255,255,.72);border:1px solid rgba(226,232,240,.72);border-radius:0 0 var(--radius) var(--radius);box-shadow:var(--shadow-sm)}
h1{font-size:clamp(28px,4vw,38px);line-height:1.24;margin:.35em 0 .55em;letter-spacing:-.03em;color:#0b1220}
h2{font-size:clamp(21px,3vw,26px);line-height:1.35;margin:1.8em 0 .65em;letter-spacing:-.015em;position:relative;padding-left:14px}h2:before{content:"";position:absolute;left:0;top:.2em;width:4px;height:1.05em;border-radius:999px;background:linear-gradient(180deg,var(--brand),var(--brand-2))}
h3{font-size:18px;margin:1.25em 0 .5em}p{margin:.75em 0}ul,ol{padding-left:1.35em}li{margin:.22em 0}code{background:#eef2f7;border:1px solid #dbe3ef;border-radius:6px;padding:.1em .35em;font-family:ui-monospace,SFMono-Regular,Consolas,'Liberation Mono',monospace;font-size:.92em}strong{color:#111827}h1,h2,h3{scroll-margin-top:96px}
.toolbar{background:linear-gradient(135deg,#eff6ff,#f0fdfa);border:1px solid #bfdbfe;border-radius:var(--radius);padding:14px 16px;margin:18px 0 22px;font-size:14px;box-shadow:var(--shadow-sm)}.toolbar strong{color:var(--brand-dark)}.toolbar a{font-weight:700;display:inline-block;padding:2px 4px;border-radius:6px}.toolbar a:hover{background:rgba(37,99,235,.08);text-decoration:none}
.screenshot-placeholder{border:1.5px dashed #b6c6da;border-radius:var(--radius);padding:28px;text-align:center;color:#64748b;background:linear-gradient(135deg,#fff,#f8fafc);margin:20px 0 18px;font-size:14px;box-shadow:inset 0 1px 0 rgba(255,255,255,.75)}
.result-example{background:var(--warning-bg);border:1px solid var(--warning-line);border-radius:var(--radius-sm);padding:13px 15px;margin:-6px 0 22px;color:var(--warning-fg);font-size:14px}.result-example strong{color:#7c2d12}
.faq,.rel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:10px 20px;margin:30px 0;box-shadow:var(--shadow-sm)}.faq h2,.rel h2{border:0;padding:0;margin:.75em 0}.faq h2:before,.rel h2:before{display:none}.faq p{padding:9px 0;border-bottom:1px solid #edf2f7}.faq p:last-child{border-bottom:0}.rel ul{columns:2;column-gap:28px;margin-top:8px}.rel li{break-inside:avoid;margin:.35em 0}
.seo-tool{background:linear-gradient(135deg,#eff6ff,#ecfeff);border:1px solid #bae6fd;border-radius:18px;padding:18px;margin:20px 0 24px;box-shadow:var(--shadow-md)}.seo-tool h2{border:0;padding:0;margin:.15em 0 .55em}.seo-tool h2:before{display:none}.seo-tool p{color:var(--mut);margin:.35em 0 .85em}.seo-tool label{display:block;font-weight:700;margin:12px 0 5px}.seo-tool select,.seo-tool input{width:100%;max-width:440px;padding:10px 11px;border:1px solid var(--line-strong);border-radius:10px;background:#fff;color:var(--fg);font:inherit}.seo-tool button{margin-top:14px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;border:0;border-radius:10px;padding:10px 16px;font-weight:800;cursor:pointer;box-shadow:0 8px 18px rgba(37,99,235,.22)}.seo-tool button:hover{filter:brightness(1.03);transform:translateY(-1px)}.seo-tool .result{background:#fff;border:1px solid #dbeafe;border-radius:12px;margin-top:14px;padding:13px;box-shadow:var(--shadow-sm)}
footer{background:linear-gradient(180deg,#0f172a,#09111f);color:#cbd5e1;margin-top:54px;padding:38px 0 0}footer .wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:22px 26px}footer h4{color:#fff;font-size:14px;margin:0 0 10px;letter-spacing:.02em}footer ul{list-style:none;margin:0;padding:0;font-size:13px;line-height:1.85}footer li{margin:0}footer a{color:#cbd5e1}footer a:hover{color:#fff}.cols{min-width:0}.compliance{font-size:12px;color:#cbd5e1;max-width:960px;margin:26px auto 0;padding:14px 20px;border-top:1px solid rgba(148,163,184,.22);background:rgba(255,255,255,.03)}.copyright{text-align:center;color:#94a3b8;font-size:12px;padding:18px}
.hero{position:relative;overflow:hidden;background:radial-gradient(circle at 82% 18%,rgba(6,182,212,.32),transparent 280px),linear-gradient(135deg,#0f172a,#1e3a8a 58%,#075985);color:#fff;padding:64px 0 54px}.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(180deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:42px 42px;mask-image:linear-gradient(180deg,rgba(0,0,0,.75),transparent)}.hero .wrap{position:relative;max-width:960px;margin:0 auto;padding:0 20px}.hero h1{color:#fff;font-size:clamp(34px,5vw,48px);margin:0 0 .35em;max-width:780px}.hero p.sub{color:#dbeafe;font-size:17px;margin:0 0 22px;max-width:720px}.hero .btns{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:10px 18px;border-radius:999px;font-weight:800;box-shadow:var(--shadow-sm)}.btn:hover{text-decoration:none;transform:translateY(-1px)}.btn.primary{background:linear-gradient(135deg,#3b82f6,#06b6d4);color:#fff}.btn.ghost{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.24)}.badges{margin-top:16px;font-size:13px;color:#bfdbfe}.sec{max-width:960px;margin:0 auto;padding:38px 20px}.sec h2{font-size:25px;margin:0 0 18px}.sec h2:before{height:1em}.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.tcard,.trow,.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);color:var(--fg);box-shadow:var(--shadow-sm);transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}.tcard{display:block;padding:18px}.tcard:hover,.trow:hover,.step:hover{text-decoration:none;border-color:#93c5fd;box-shadow:var(--shadow-md);transform:translateY(-2px)}.tcard .ticon{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:10px;background:var(--brand-soft);color:var(--brand);font-size:18px}.tcard h3{margin:.55em 0 .25em;font-size:17px}.tcard p{color:var(--mut);font-size:13px;margin:0 0 12px}.tcard .tbtn{color:var(--brand);font-size:13px;font-weight:800}.pcards{display:flex;flex-wrap:wrap;gap:10px}.pcard{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 14px;font-size:14px;color:var(--fg);box-shadow:var(--shadow-sm)}.pcard:hover{border-color:#93c5fd;text-decoration:none;color:var(--brand);transform:translateY(-1px)}.tools{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.trow{display:flex;align-items:center;gap:13px;padding:14px 16px}.trow .tdot{color:var(--brand);font-size:18px}.trow b{font-size:15px}.trow p{margin:2px 0 0;color:var(--mut);font-size:13px}.trow .tarr{margin-left:auto;color:var(--brand);font-weight:800}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.step{display:block;background:linear-gradient(135deg,#fff,#eff6ff);padding:16px}.step b{font-size:16px}.step p{margin:7px 0 0;color:var(--mut);font-size:13px}.faqbox{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:12px 20px;box-shadow:var(--shadow-sm)}.faqbox .fq{padding:12px 0;border-bottom:1px solid var(--line)}.faqbox .fq:last-child{border:0}.faqbox .fq b{font-size:15px;color:#111827}.faqbox .fq p{margin:5px 0 0;color:var(--mut);font-size:14px}.cta{text-align:center;margin:26px 0}
@media(max-width:760px){.cards{grid-template-columns:repeat(2,1fr)}.steps{grid-template-columns:1fr}footer .wrap{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){body{font-size:15px}.wrap{padding:0 14px}header.nav .wrap{gap:5px;padding:10px 12px}header.nav a{font-size:13px;padding:7px 9px}.crumb{padding:14px 14px 0}main.wrap{border-left:0;border-right:0;border-radius:0}.rel ul{columns:1}.tools{grid-template-columns:1fr}.hero{padding:46px 0 40px}.sec{padding:30px 14px}.cards{grid-template-columns:1fr}footer .wrap{grid-template-columns:1fr}.compliance{padding-left:14px;padding-right:14px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media(max-width:760px){
  header.nav .nav-toggle{display:inline-flex}
  header.nav .nav-links{display:none;width:100%;flex-direction:column;align-items:stretch;gap:6px;padding-top:10px}
  header.nav .nav-links a{text-align:center}
  header.nav a.nav-dl{margin-left:0}
  header.nav.open .nav-links{display:flex}
}