:root{--bg:#fff;--bg-soft:#f6f7fb;--text:#16181d;--muted:#6b7280;--accent:#4f46e5;--accent-light:#eef2ff;--accent-grad:linear-gradient(135deg,#4f46e5 0%,#7c3aed 100%);--border:#e7e8ee;--radius:14px;--max:1000px;--article:760px}
*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--text);line-height:1.7;background:var(--bg)}
.container{max-width:var(--max);margin:0 auto;padding:0 24px}.site-nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.8);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.site-nav .container{display:flex;align-items:center;justify-content:space-between;height:64px}.logo{font-weight:800;font-size:1.15rem;letter-spacing:-.02em}.logo a{color:var(--text);text-decoration:none}.logo span{color:var(--accent)}.site-nav .links{display:flex;gap:28px;font-size:.95rem;font-weight:500}.site-nav .links a{color:var(--text);text-decoration:none}.site-nav .links a:hover,.site-nav .links a[aria-current=page]{color:var(--accent)}
.btn{display:inline-block;background:var(--accent-grad);color:#fff;text-decoration:none;padding:15px 34px;border-radius:10px;font-weight:600;box-shadow:0 8px 24px -8px rgba(79,70,229,.5);transition:transform .15s,box-shadow .15s}.btn:hover{transform:translateY(-2px);box-shadow:0 12px 28px -8px rgba(79,70,229,.6)}.btn.nav-cta{padding:10px 22px;font-size:.9rem}
.article-hero{padding:72px 0 68px;background:radial-gradient(circle at 20% 20%,#ede9fe 0%,rgba(255,255,255,0) 45%),radial-gradient(circle at 80% 0%,#e0e7ff 0%,rgba(255,255,255,0) 45%),var(--bg)}.hero-inner{max-width:var(--article);margin:0 auto}.breadcrumb{font-size:.9rem;color:var(--muted);margin-bottom:24px}.breadcrumb a{color:var(--accent);text-decoration:none;font-weight:600}.tag{display:inline-block;color:var(--accent);background:var(--accent-light);padding:5px 12px;border-radius:999px;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;margin-bottom:20px}h1{font-size:3rem;line-height:1.13;letter-spacing:-.035em;margin-bottom:20px}.lead{font-size:1.18rem;color:var(--muted);margin-bottom:20px}.article-meta{font-size:.9rem;color:var(--muted)}
article{max-width:var(--article);margin:0 auto;padding:64px 24px 80px}article h2{font-size:2rem;line-height:1.25;letter-spacing:-.02em;margin:52px 0 16px;scroll-margin-top:86px}article h3{font-size:1.3rem;line-height:1.35;margin:32px 0 10px}article p{color:#3f4652;margin-bottom:18px}article ul,article ol{color:#3f4652;margin:0 0 22px 24px}article li{padding-left:5px;margin-bottom:9px}article a{color:var(--accent);font-weight:600}.quick-answer{background:var(--accent-light);border-left:4px solid var(--accent);border-radius:0 var(--radius) var(--radius) 0;padding:24px 26px;margin:0 0 34px}.quick-answer strong{display:block;margin-bottom:7px}.quick-answer p{margin:0;color:#37355f}.toc{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius);padding:26px;margin-bottom:38px}.toc strong{display:block;margin-bottom:10px}.toc ol{margin:0 0 0 20px}.toc li{margin-bottom:5px}.toc a{color:var(--text);text-decoration:none;font-weight:500}.toc a:hover{color:var(--accent)}.checklist{list-style:none;margin-left:0}.checklist li{position:relative;padding-left:29px}.checklist li::before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:800}
.article-cta{background:var(--accent-grad);color:#fff;border-radius:var(--radius);padding:38px;margin-top:56px;text-align:center}.article-cta h2{color:#fff;margin:0 0 12px}.article-cta p{color:#fff;opacity:.9;max-width:590px;margin:0 auto 24px}.article-cta .btn{background:#fff;color:var(--accent);box-shadow:none}.back-link{display:inline-block;margin-top:34px;text-decoration:none}footer{text-align:center;padding:40px 0;color:var(--muted);font-size:.9rem;border-top:1px solid var(--border)}footer a{color:var(--accent);text-decoration:none;font-weight:600}
@media(max-width:760px){.site-nav .links{display:none}.article-hero{padding:52px 0}h1{font-size:2.25rem}article{padding-top:48px}article h2{font-size:1.65rem}.article-cta{padding:32px 22px}}