*{box-sizing:border-box;margin:0;padding:0}
body{font-family:Segoe UI,Arial,sans-serif;background:#07111f;color:#fff;min-height:100vh}
.lesson{padding:36px;max-width:1180px;margin:auto}
.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:center;background:linear-gradient(135deg,#10b981,#60a5fa);border-radius:34px;padding:42px;box-shadow:0 24px 70px rgba(0,0,0,.35);position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 20% 20%,rgba(255,255,255,.25),transparent 18%),radial-gradient(circle at 80% 70%,rgba(255,255,255,.18),transparent 18%);pointer-events:none}
.hero>*{position:relative}.eyebrow{text-transform:uppercase;letter-spacing:2px;font-weight:900;color:#06111f;background:rgba(255,255,255,.75);display:inline-block;padding:8px 14px;border-radius:999px;margin-bottom:18px}
h1{font-size:54px;line-height:1.05;margin-bottom:18px;text-shadow:0 8px 18px rgba(0,0,0,.3)}h1 span{filter:drop-shadow(0 8px 14px rgba(0,0,0,.25))}
.lead{font-size:20px;line-height:1.6;max-width:760px}.chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}.chips span{background:rgba(0,0,0,.25);border:1px solid rgba(255,255,255,.25);padding:10px 14px;border-radius:999px;font-weight:800}
.hero-card{background:rgba(8,17,31,.72);border:1px solid rgba(255,255,255,.22);border-radius:28px;padding:28px;text-align:center;backdrop-filter:blur(10px)}.big-icon{font-size:92px;margin-bottom:14px}.hero-card h2{color:#ffcc00;margin-bottom:10px}.hero-card p{color:#dbeafe;line-height:1.5}
.grid{display:grid;gap:24px;margin-top:24px}.two{grid-template-columns:1fr 1fr}.panel{background:#101827;border:1px solid #26324d;border-radius:28px;padding:28px;box-shadow:0 16px 42px rgba(0,0,0,.22)}.panel h2{color:#00d4ff;margin-bottom:18px;font-size:28px}.panel li{margin:12px 0;color:#e5e7eb;line-height:1.5;font-size:17px}.panel ol,.panel ul{padding-left:24px}.project,.quiz{margin-top:24px}.project p,.quiz p{color:#d1d5db;font-size:18px;line-height:1.6;margin-bottom:18px}
button{border:0;border-radius:999px;background:#ffcc00;color:#111827;font-weight:900;padding:13px 20px;cursor:pointer;font-size:16px;transition:.25s}button:hover{transform:translateY(-2px);filter:brightness(1.08)}.answers{display:flex;gap:12px;flex-wrap:wrap}.answers button{background:#1e293b;color:#fff;border:1px solid #334155}.result{font-weight:900;margin-top:18px}.ok{color:#86efac!important}.bad{color:#fca5a5!important}
@media(max-width:850px){.lesson{padding:18px}.hero,.two{grid-template-columns:1fr}.hero{padding:28px}h1{font-size:38px}.lead{font-size:18px}}

.hero-img{width:100%;height:170px;object-fit:cover;border-radius:22px;margin-bottom:18px;border:1px solid rgba(255,255,255,.18);box-shadow:0 16px 35px rgba(0,0,0,.25)}