:root{--bg:#0b0c15;--card:#11132a;--panel:#0f1130;--text:#e8e6f3;--muted:#9ca0b8;--accent:#6ee7b7;--accent2:#7aa2f7;--border:#23244a;--warn:#ffe082;--ok:#6ee7b7;--bad:#ff8080}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",sans-serif;background:var(--bg);color:var(--text);line-height:1.65;-webkit-font-smoothing:antialiased}
.wrap{max-width:1000px;margin:0 auto;padding:0 1.25rem}
a{color:var(--accent2);text-decoration:none;border-bottom:1px solid rgba(122,162,247,.28)}
a:hover{border-bottom-color:rgba(122,162,247,.65);filter:brightness(1.12)}
header{background:radial-gradient(120% 140% at 12% 0%,#1a1f45 0%,#11132a 45%,#0b0c15 100%);border-bottom:1px solid var(--border);padding:2.75rem 0 2rem}
.eyebrow{font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);font-weight:700}
h1{font-size:clamp(1.8rem,4.5vw,2.8rem);line-height:1.12;font-weight:800;letter-spacing:-.03em;margin:.55rem 0 .7rem}
.subtitle{color:var(--muted);font-size:1.02rem;max-width:62ch}
.chips{display:flex;gap:.45rem;flex-wrap:wrap;margin-top:1.25rem}
.chip{font-size:.8rem;border-radius:999px;padding:.3rem .75rem;border:1px solid var(--border);background:rgba(122,162,247,.08);color:var(--accent2);font-weight:600}
.chip.green{background:rgba(110,231,183,.1);color:var(--accent);border-color:rgba(110,231,183,.25)}
nav.steps{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:1.5rem}
nav.steps a{font-size:.86rem;border:1px solid var(--border);border-radius:.5rem;padding:.35rem .7rem;color:var(--text);background:var(--panel);transition:.15s;border-bottom:1px solid var(--border)}
nav.steps a:hover{border-color:var(--accent2);color:var(--accent2)}
nav.steps a.done{border-color:rgba(110,231,183,.45);color:var(--accent)}
nav.steps a.current{border-color:var(--accent2);background:#1b2049}
.progress-bar{position:sticky;top:0;z-index:20;background:rgba(11,12,21,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);padding:.7rem 0}
.progress-inner{display:flex;align-items:center;gap:.9rem;flex-wrap:wrap}
.track{flex:1;min-width:160px;height:8px;border-radius:999px;background:#1b1e3d;overflow:hidden}
.fill{height:100%;width:0;background:linear-gradient(90deg,var(--accent2),var(--accent));transition:width .35s ease}
.progress-text{font-size:.86rem;color:var(--muted);white-space:nowrap}
.progress-text b{color:var(--accent)}
.reset{background:none;border:1px solid var(--border);color:var(--muted);border-radius:.45rem;padding:.25rem .6rem;font-size:.78rem;cursor:pointer;font-family:inherit}
.reset:hover{color:var(--bad);border-color:var(--bad)}
main{padding:2rem 0 1rem}
section{background:var(--card);border:1px solid var(--border);border-radius:1.15rem;padding:1.75rem;margin-bottom:1.5rem}
section.done{border-color:rgba(110,231,183,.4);box-shadow:0 0 0 1px rgba(110,231,183,.12) inset}
.step-head{display:flex;align-items:center;gap:.7rem;flex-wrap:wrap;margin-bottom:.4rem}
.step-num{background:var(--accent2);color:#0b0c15;font-weight:800;border-radius:.55rem;padding:.12rem .6rem;font-size:.9rem;letter-spacing:.02em}
.step-head h2{font-size:1.28rem;font-weight:700;margin:0}
.check{display:none;color:var(--ok);font-weight:700;font-size:.85rem;margin-left:auto}
section.done .check{display:inline}
h3{font-size:.98rem;margin:1.35rem 0 .55rem;color:var(--accent2);font-weight:700}
p{margin-bottom:.85rem}
ul{padding-left:1.15rem;margin-bottom:.9rem}
li{margin-bottom:.3rem}
.video{position:relative;padding-bottom:56.25%;height:0;border-radius:.75rem;overflow:hidden;border:1px solid var(--border);margin:.6rem 0 .35rem;background:#000}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-cap{font-size:.8rem;color:var(--muted);margin-bottom:1rem}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.75rem;margin:.6rem 0 1rem}
.card{display:block;background:var(--panel);border:1px solid var(--border);border-radius:.75rem;padding:.9rem 1rem;transition:.15s;border-bottom:1px solid var(--border)}
.card:hover{border-color:var(--accent2);transform:translateY(-2px)}
.card h4{font-size:.92rem;margin-bottom:.3rem;color:var(--text);font-weight:700}
.card p{font-size:.8rem;color:var(--muted);margin:0 0 .45rem}
.tag{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);font-weight:700}
.grid-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:.9rem;margin-top:1rem}
.step-card{display:block;background:var(--panel);border:1px solid var(--border);border-radius:.85rem;padding:1rem 1.1rem;transition:.15s;border-bottom:1px solid var(--border)}
.step-card:hover{border-color:var(--accent2);transform:translateY(-2px)}
.step-card h4{font-size:1rem;margin-bottom:.3rem;color:var(--text)}
.step-card p{font-size:.84rem;color:var(--muted);margin:0}
.step-card.done{border-color:rgba(110,231,183,.45)}
.quiz{border-top:1px solid var(--border);margin-top:1.25rem;padding-top:1.1rem}
.quiz h4{font-size:.95rem;margin-bottom:.7rem}
.q{margin-bottom:.9rem}
.q p{font-size:.9rem;margin-bottom:.45rem}
.opts{display:flex;flex-direction:column;gap:.4rem}
.opt{text-align:left;background:#161a3d;border:1px solid var(--border);color:var(--text);border-radius:.45rem;padding:.5rem .75rem;font-size:.88rem;cursor:pointer;transition:.12s;font-family:inherit}
.opt:hover:not(:disabled){border-color:var(--accent2);background:#1b2049}
.opt:disabled{cursor:default;opacity:.75}
.opt.right{border-color:var(--ok);background:rgba(110,231,183,.14);color:var(--accent);opacity:1}
.opt.wrong{border-color:var(--bad);background:rgba(255,128,128,.12);color:var(--bad)}
.fb{font-size:.85rem;margin-top:.5rem;min-height:1.2em;font-weight:600}
.fb.ok{color:var(--ok)}
.fb.bad{color:var(--bad)}
.actions{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center;margin-top:.9rem}
.btn{font-family:inherit;font-size:.9rem;font-weight:700;border-radius:.5rem;padding:.55rem 1rem;cursor:pointer;border:1px solid transparent;transition:.15s;display:inline-block}
.btn-primary{background:var(--accent);color:#0b0c15}
.btn-primary:hover{filter:brightness(1.08);border-bottom:1px solid transparent}
.btn-primary:disabled{background:#2a2d4d;color:var(--muted);cursor:not-allowed;filter:none}
.btn-ghost{background:none;border-color:var(--border);color:var(--text)}
.btn-ghost:hover{border-color:var(--accent2);color:var(--accent2)}
.note{background:rgba(255,196,0,.07);border:1px solid rgba(255,196,0,.22);border-radius:.7rem;padding:.9rem 1rem;margin-bottom:1.5rem;color:var(--warn);font-size:.88rem}
.status-line{font-size:.85rem;color:var(--muted);margin-top:.55rem}
.pager{display:flex;justify-content:space-between;gap:.75rem;flex-wrap:wrap;margin-top:1.25rem}
footer{border-top:1px solid var(--border);margin-top:2.5rem;padding:2rem 0 3rem;color:var(--muted);font-size:.84rem}
footer p{margin-bottom:.4rem}
.crumb{font-size:.82rem;color:var(--muted);margin-bottom:.75rem}
.crumb a{border-bottom:none}
@media(max-width:640px){header{padding:2.25rem 0 1.75rem}section{padding:1.2rem}.step-head h2{font-size:1.12rem}}