*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:17px/1.7 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:#1e293b;background:#fafbff;-webkit-font-smoothing:antialiased}
a{color:#4f46e5}a:hover{color:#3730a3}
.nav{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.85);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid #e5e7f0}
.nav .in{max-width:1100px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.brand{font-weight:800;font-size:1.1em;color:#0f172a;text-decoration:none;margin-right:auto;display:flex;align-items:center;gap:8px}
.logo{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,#6366f1,#ec4899);display:inline-grid;place-items:center;color:#fff;font-size:.8em}
.nav a.l{color:#475569;text-decoration:none;font-weight:600;font-size:.93em;padding:6px 10px;border-radius:8px}.nav a.l:hover,.nav a.on{background:#eef0ff;color:#4338ca}
.nav a.buy{background:#0f172a;color:#fff;padding:8px 14px;border-radius:999px;font-weight:700;font-size:.9em;text-decoration:none;margin-left:6px}
main{max-width:780px;margin:0 auto;padding:40px 20px}.wide{max-width:1100px}
h1,h2,h3{color:#0f172a;line-height:1.2;letter-spacing:-.02em}h1{font-size:2.4em;margin:.2em 0 .5em}h2{font-size:1.55em;margin-top:1.8em}
.hero{background:radial-gradient(1200px 500px at 20% -10%,#c7d2fe 0,transparent 60%),radial-gradient(900px 500px at 100% 0,#fbcfe8 0,transparent 55%),#f5f7ff;padding:80px 20px 70px;text-align:center;border-bottom:1px solid #e5e7f0}
.hero .in{max-width:820px;margin:0 auto}.pill{display:inline-block;background:#fff;border:1px solid #e0e3f5;border-radius:999px;padding:5px 14px;font-size:.85em;font-weight:600;color:#4338ca;margin-bottom:18px}
.hero h1{font-size:clamp(2.2em,6vw,3.6em);margin:0 0 16px;background:linear-gradient(90deg,#0f172a,#4338ca);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{font-size:1.2em;color:#475569;max-width:620px;margin:0 auto 28px}.hero small{display:block;color:#64748b;margin-top:14px}
.btn{display:inline-block;padding:13px 22px;border-radius:12px;font-weight:700;text-decoration:none;margin:6px;transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-2px)}.p{background:linear-gradient(135deg,#6366f1,#4f46e5);color:#fff!important;box-shadow:0 8px 20px -6px rgba(79,70,229,.6)}
.s{background:#fff;color:#0f172a!important;border:1px solid #d6d9ea}
.sec{max-width:1100px;margin:0 auto;padding:64px 20px}.sec h2{text-align:center;margin:0 0 8px;font-size:2em}.lead{text-align:center;color:#64748b;margin:0 auto 36px;max-width:620px}
.grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.card{background:#fff;border:1px solid #e5e7f0;border-radius:16px;padding:24px;box-shadow:0 1px 2px rgba(15,23,42,.04)}
a.card{text-decoration:none;color:inherit;transition:transform .15s,box-shadow .15s,border-color .15s}a.card:hover{transform:translateY(-3px);box-shadow:0 12px 28px -12px rgba(15,23,42,.25);border-color:#c7d2fe}
.card h3{margin:.4em 0 .3em}.card p{margin:0;color:#475569;font-size:.95em}.num{width:36px;height:36px;border-radius:10px;background:#eef0ff;color:#4338ca;font-weight:800;display:grid;place-items:center}
.ico{font-size:1.6em}.go{color:#4f46e5;font-weight:700;font-size:.9em;margin-top:12px;display:block}
.ba{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}.ba .card{padding:0;overflow:hidden}
.ba .hd{padding:12px 20px;font-weight:700;font-size:.9em;border-bottom:1px solid #e5e7f0}.ba .bad .hd{background:#fef2f2;color:#b91c1c}.ba .good .hd{background:#ecfdf5;color:#047857}
.ba .bd{padding:18px 20px;font-size:.95em}.ba .q{color:#64748b;font-style:italic;margin-bottom:10px}.illus{text-align:center;color:#64748b;font-size:.85em;margin-top:14px}
.band{background:#0f172a;color:#e2e8f0}.band h2{color:#fff}.band .lead{color:#94a3b8}.band .card{background:#1e293b;border-color:#334155}.band .card h3{color:#fff}.band .card p{color:#cbd5e1}
code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em}pre{background:#0f172a;color:#e2e8f0;border-radius:12px;padding:18px;white-space:pre-wrap;line-height:1.6}
ol,ul{padding-left:1.3em}li{margin:.3em 0}
.note{background:#eef0ff;border:1px solid #c7d2fe;border-radius:12px;padding:14px 18px}
.cta{background:linear-gradient(135deg,#4f46e5,#9333ea);color:#e0e7ff;border-radius:20px;padding:34px 28px;margin:48px 0 8px;text-align:center}
.cta strong{color:#fff;font-size:1.3em;display:block;margin-bottom:6px}.cta .s{border:0}.cta small{display:block;margin-top:12px;opacity:.85}
footer{border-top:1px solid #e5e7f0;background:#fff;text-align:center;color:#64748b;font-size:.9em;padding:36px 20px}footer .fl a{margin:0 8px;font-weight:600;text-decoration:none}
@media(max-width:640px){.brand{flex-basis:100%;margin-bottom:4px}.nav .in{gap:0;justify-content:space-between}.nav a.l{padding:5px 7px;font-size:.88em}.nav a.buy{display:none}.hero{padding:56px 18px 48px}main{padding:28px 18px}h1{font-size:1.9em}.sec{padding:48px 18px}.btn{display:block;margin:10px 0}}