:root{--ink:#0f172a;--mut:#475569;--bg:#f8fafc;--card:#fff;--acc:#4f46e5;--acc2:#06b6d4;--ok:#16a34a;--line:#e2e8f0}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:17px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--acc)}img{max-width:100%}
.w{max-width:1040px;margin:0 auto;padding:0 18px}.n{max-width:720px;margin:0 auto;padding:0 18px}
header.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
header.top .w{display:flex;align-items:center;justify-content:space-between;height:56px}
.logo{font-weight:800;text-decoration:none;color:var(--ink);letter-spacing:-.02em}.logo b{color:var(--acc)}
.btn{display:inline-block;background:var(--acc);color:#fff!important;text-decoration:none;border:0;border-radius:12px;padding:14px 22px;font-weight:700;font-size:1rem;cursor:pointer}
.btn:hover{filter:brightness(1.08)}.btn.sm{padding:9px 16px;font-size:.9rem}.btn.ghost{background:#fff;color:var(--acc)!important;border:2px solid var(--acc)}.btn.dis{background:#cbd5e1;cursor:default}
.hero{background:linear-gradient(135deg,#1e1b4b,#4f46e5 60%,#06b6d4);color:#fff;padding:56px 0 64px}
.hero h1{font-size:clamp(2.1rem,7vw,3.6rem);line-height:1.08;margin:0 0 14px;letter-spacing:-.03em}
.hero p{font-size:1.15rem;max-width:560px;opacity:.95}.hero .btn{background:#fff;color:#312e81!important;margin:8px 10px 0 0}
.hero .btn.ghost{background:transparent;color:#fff!important;border-color:#fff}
.pill{display:inline-block;background:rgba(255,255,255,.18);border-radius:99px;padding:4px 12px;font-size:.85rem;margin-bottom:14px}
section{padding:44px 0}h2{font-size:1.75rem;line-height:1.2;margin:0 0 8px;letter-spacing:-.02em}.sub{color:var(--mut);margin:0 0 24px}
.grid{display:grid;gap:16px}@media(min-width:760px){.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px}
.card h3{margin:0 0 6px;font-size:1.15rem}.price{font-size:2rem;font-weight:800}.soon{opacity:.85}
.tag{display:inline-block;font-size:.75rem;font-weight:700;border-radius:99px;padding:2px 10px;background:#e0e7ff;color:#3730a3}.tag.s{background:#fef3c7;color:#92400e}
.card.feat{border:2px solid var(--acc);box-shadow:0 8px 30px rgba(79,70,229,.15)}
ul.ticks{list-style:none;padding:0}ul.ticks li{padding-left:26px;position:relative;margin:6px 0}ul.ticks li:before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:800}
.steps{counter-reset:s}.steps .card{position:relative;padding-left:64px}.steps .card:before{counter-increment:s;content:counter(s);position:absolute;left:16px;top:16px;width:34px;height:34px;border-radius:50%;background:var(--acc);color:#fff;display:grid;place-items:center;font-weight:800}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin:8px 0}summary{cursor:pointer;font-weight:700}
input[type=email],input[type=text]{width:100%;padding:13px;border:1px solid #94a3b8;border-radius:10px;font:inherit;margin:6px 0 12px}
label{font-weight:600;font-size:.95rem}.note{font-size:.88rem;color:var(--mut)}
footer{background:#0f172a;color:#cbd5e1;padding:32px 0;font-size:.9rem}footer a{color:#e2e8f0}
.alert{background:#fef3c7;border-radius:12px;padding:12px 16px;margin:12px 0}.good{background:#dcfce7}
.linkbox{word-break:break-all;background:#eef2ff;border-radius:10px;padding:12px;font-family:ui-monospace,monospace;font-size:.9rem}
/* learn */
.lm{padding:18px 0}.lm h2{font-size:1.2rem;margin-top:22px}
.les{display:flex;gap:10px;align-items:center;padding:12px 14px;background:#fff;border:1px solid var(--line);border-radius:12px;margin:8px 0;text-decoration:none;color:var(--ink)}
.les .tk{width:24px;height:24px;border-radius:50%;border:2px solid #94a3b8;flex:none;display:grid;place-items:center;font-size:.8rem;color:#fff}.les.done .tk{background:var(--ok);border-color:var(--ok)}
.bar{height:10px;background:#e2e8f0;border-radius:99px;overflow:hidden}.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--acc),var(--acc2))}
.lesson h1{font-size:1.8rem;line-height:1.2}.lesson h2{margin-top:28px;font-size:1.3rem}.lesson h3{margin-top:20px}
.lesson blockquote{margin:16px 0;padding:10px 16px;border-left:4px solid var(--acc2);background:#ecfeff;border-radius:0 10px 10px 0}
.prompt{border:1px solid #c7d2fe;border-radius:12px;margin:14px 0;background:#f5f7ff;overflow:hidden}.prompt .ph{display:flex;justify-content:space-between;align-items:center;padding:6px 12px;background:#e0e7ff;font-size:.8rem;font-weight:700;color:#3730a3}
.prompt button{background:#4f46e5;color:#fff;border:0;border-radius:8px;padding:5px 12px;font-weight:700;cursor:pointer}
pre{white-space:pre-wrap;word-wrap:break-word;margin:0;padding:12px;font:.9rem/1.5 ui-monospace,monospace}code{background:#eef2ff;padding:1px 5px;border-radius:5px}
.nav{display:flex;justify-content:space-between;gap:10px;margin:28px 0}
@media print{header.top,footer,.nav,.noprint{display:none}.cert{border:6px double #4f46e5}}
.cert{border:6px double #4f46e5;background:#fff;padding:40px 20px;text-align:center;border-radius:8px}.cert h1{font-size:2rem}