:root{
  --bg:#f6f7fb;
  --surface:#ffffff;
  --surface-2:#f0f2f7;
  --text:#12151b;
  --muted:#5f6673;
  --line:#dfe3ea;
  --accent:#334155;
  --accent-2:#111827;
  --safe:#eef7f1;
  --safe-border:#b9ddc2;
  --warn:#fff8e8;
  --warn-border:#ead39a;
  --radius:18px;
  --shadow:0 12px 35px rgba(17,24,39,.08);
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{color:inherit}
img{max-width:100%}
.container{width:min(var(--max),calc(100% - 40px));margin:0 auto}
.skip-link{position:absolute;left:-9999px;top:auto}.skip-link:focus{left:16px;top:16px;background:#fff;padding:10px 14px;z-index:1000;border-radius:10px}
.topnote{background:#111827;color:#fff;font-size:.9rem;text-align:center;padding:9px 20px}.topnote a{text-decoration:underline;text-underline-offset:3px}
.site-header{position:sticky;top:0;z-index:50;background:rgba(246,247,251,.92);backdrop-filter:blur(16px);border-bottom:1px solid rgba(223,227,234,.9)}
.nav{height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:800;letter-spacing:-.02em}
.brand-mark{width:38px;height:38px;border-radius:12px;background:#111827;color:#fff;display:grid;place-items:center;font-size:.78rem;letter-spacing:.04em}
.nav-links{display:flex;align-items:center;gap:24px}.nav-links a{text-decoration:none;color:#3f4652;font-weight:650;font-size:.95rem}.nav-links a:hover{color:#111827}
.nav-cta{padding:10px 15px;border:1px solid #cfd4dd;border-radius:12px;background:#fff!important}
.menu-btn{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;font-weight:700}
.hero{padding:84px 0 60px;background:radial-gradient(circle at 85% 5%,#e8ecf5 0,transparent 34%),radial-gradient(circle at 5% 65%,#edf0f5 0,transparent 30%)}
.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:48px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 11px;border:1px solid var(--line);border-radius:999px;background:#fff;font-size:.82rem;font-weight:750;color:#495160}
h1{font-size:clamp(2.4rem,5.4vw,5.2rem);line-height:.98;letter-spacing:-.055em;margin:22px 0 24px;max-width:880px}
.hero p.lead{font-size:clamp(1.05rem,1.7vw,1.3rem);color:var(--muted);max-width:760px;margin:0 0 30px}
.actions{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;font-weight:750;padding:13px 18px;border-radius:13px;border:1px solid var(--line);background:#fff}.btn.primary{background:#111827;color:#fff;border-color:#111827}.btn:hover{transform:translateY(-1px)}
.hero-card{background:#111827;color:#fff;border-radius:28px;padding:30px;box-shadow:var(--shadow)}.hero-card h2{margin-top:0;font-size:1.3rem}.hero-card ul{list-style:none;padding:0;margin:20px 0 0}.hero-card li{display:flex;gap:10px;padding:12px 0;border-top:1px solid rgba(255,255,255,.12)}.dot{width:8px;height:8px;border-radius:99px;background:#cbd5e1;margin-top:9px;flex:none}
.section{padding:76px 0}.section.white{background:#fff}.section-head{max-width:760px;margin-bottom:34px}.section-head h2{font-size:clamp(2rem,3.4vw,3.25rem);line-height:1.05;letter-spacing:-.04em;margin:0 0 14px}.section-head p{color:var(--muted);margin:0;font-size:1.05rem}
.grid{display:grid;gap:18px}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:0 4px 18px rgba(17,24,39,.035)}.card h3{margin:10px 0 8px;font-size:1.18rem;letter-spacing:-.02em}.card p{margin:0;color:var(--muted)}.card a.more{display:inline-block;margin-top:16px;font-weight:750;text-decoration:none}.card a.more:hover{text-decoration:underline}.icon{width:40px;height:40px;border-radius:12px;background:#eef1f6;display:grid;place-items:center;font-weight:800;color:#374151}
.steps{counter-reset:step;display:grid;gap:14px}.step{counter-increment:step;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 22px 20px 66px;position:relative}.step:before{content:counter(step);position:absolute;left:20px;top:20px;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:#111827;color:#fff;font-weight:800;font-size:.85rem}.step h3{margin:0 0 6px;font-size:1.05rem}.step p{margin:0;color:var(--muted)}
.notice{border-radius:16px;padding:18px 20px;border:1px solid}.notice.safe{background:var(--safe);border-color:var(--safe-border)}.notice.warn{background:var(--warn);border-color:var(--warn-border)}.notice strong{display:block;margin-bottom:4px}
.topic-links{display:flex;gap:10px;flex-wrap:wrap}.topic-links a{text-decoration:none;padding:9px 12px;background:#fff;border:1px solid var(--line);border-radius:999px;color:#424a57;font-size:.92rem;font-weight:650}
.prose{max-width:850px}.prose h1{font-size:clamp(2.4rem,5vw,4.5rem);margin-bottom:18px}.prose h2{font-size:1.8rem;letter-spacing:-.03em;margin:44px 0 12px}.prose h3{font-size:1.2rem;margin:30px 0 8px}.prose p,.prose li{color:#4f5663}.prose ul,.prose ol{padding-left:22px}.prose .notice p{margin:0}.breadcrumb{font-size:.9rem;color:#68707d;margin-bottom:12px}.breadcrumb a{color:#525a68}
.page-hero{padding:64px 0 36px}.page-hero h1{max-width:900px}.page-hero .lead{max-width:780px;color:var(--muted);font-size:1.15rem}
.source-box{margin-top:34px;padding:20px;background:#f5f7fa;border:1px solid var(--line);border-radius:16px}.source-box h3{margin-top:0}.source-box a{font-weight:700}
.faq{display:grid;gap:12px}.faq details{background:#fff;border:1px solid var(--line);border-radius:15px;padding:18px 20px}.faq summary{cursor:pointer;font-weight:750}.faq p{color:var(--muted);margin-bottom:0}
.footer{background:#111827;color:#e5e7eb;padding:54px 0 24px}.footer-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:36px}.footer h3{color:#fff;margin:0 0 12px}.footer p,.footer a{color:#b7bec9}.footer a{text-decoration:none}.footer a:hover{color:#fff}.footer ul{list-style:none;padding:0;margin:0}.footer li{margin:7px 0}.foot-bottom{border-top:1px solid #2a303b;margin-top:34px;padding-top:20px;font-size:.88rem;color:#9ca3af;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.contact-list{display:grid;gap:14px}.contact-item{padding:18px 20px;border:1px solid var(--line);border-radius:15px;background:#fff}.contact-item strong{display:block}.contact-item a{text-decoration:none}
.kbd{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em;background:#eceff4;border:1px solid #d9dee7;border-bottom-width:2px;padding:2px 6px;border-radius:6px}
.inline-label{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;font-weight:800;color:#69717e}
@media(max-width:900px){.hero-grid,.grid-3,.grid-2,.footer-grid{grid-template-columns:1fr}.hero{padding-top:56px}.nav-links{display:none;position:absolute;top:72px;left:20px;right:20px;flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;box-shadow:var(--shadow)}.nav-links.open{display:flex}.menu-btn{display:block}.nav-cta{text-align:center}.section{padding:58px 0}}
@media(max-width:560px){.container{width:min(var(--max),calc(100% - 26px))}.hero{padding:44px 0}.section{padding:48px 0}h1{font-size:2.75rem}.card{padding:20px}.topnote{font-size:.82rem}}