:root{--primary:#5b4bdb;--dark:#17142d;--ink:#172033;--muted:#60697a;--bg:#f6f7fb;--border:#e5e7eb}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.75}a{color:inherit;text-decoration:none}.container{width:min(900px,92%);margin:auto}header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:5}.nav{height:72px;display:flex;align-items:center;justify-content:space-between;gap:1rem}.brand{font-weight:900;font-size:1.35rem;color:var(--dark)}.back{font-weight:750;color:var(--primary)}.hero{padding:72px 0 56px;background:linear-gradient(145deg,#17142d,#4338a8);color:#fff}.kicker{font-size:.82rem;font-weight:850;text-transform:uppercase;letter-spacing:.08em;color:#bfb9ff}.hero h1{font-size:clamp(2.35rem,6vw,4.5rem);line-height:1.02;letter-spacing:-.055em;margin:.7rem 0 1rem}.hero p{font-size:1.12rem;color:rgba(255,255,255,.8);max-width:720px}.meta{font-size:.9rem;color:rgba(255,255,255,.65)}main{padding:52px 0}.article{background:#fff;border:1px solid var(--border);border-radius:24px;padding:clamp(1.4rem,4vw,3rem);box-shadow:0 16px 45px rgba(23,32,51,.08)}h2{font-size:1.65rem;line-height:1.2;margin:2.2rem 0 .7rem}h2:first-child{margin-top:0}p,li{color:#465064}.note{padding:1.2rem 1.3rem;border-radius:16px;background:#f0efff;border-left:4px solid var(--primary);margin:1.5rem 0}.checklist li{margin:.55rem 0}.cta{margin-top:2.5rem;padding:1.5rem;border-radius:18px;background:var(--dark);color:#fff}.cta p{color:rgba(255,255,255,.75)}.btn{display:inline-block;background:#fff;color:var(--primary);padding:.8rem 1rem;border-radius:12px;font-weight:850}footer{text-align:center;padding:32px;color:var(--muted);font-size:.9rem}@media(max-width:600px){.hero{padding:48px 0 38px}.nav{height:64px}.article{border-radius:18px}}