:root{--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--bg:#f8fafc;--brand:#4f46e5;--brand2:#7c3aed;--ok:#059669;--bad:#dc2626;--warn:#b45309;--r:14px}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.6 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--brand)}h1,h2,h3{line-height:1.2;letter-spacing:-.01em}h1{font-size:clamp(1.8rem,4vw,2.6rem);margin:.4em 0}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}.narrow{max-width:760px}.center{text-align:center}
.muted{color:var(--muted)}.small{font-size:.875rem}
.nav{background:#fff;border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav nav{display:flex;gap:18px;align-items:center}.nav nav a{color:var(--ink);text-decoration:none;font-weight:500}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.15rem;color:var(--ink);text-decoration:none}
.logo-mark{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff}
.btn{display:inline-block;border:0;border-radius:10px;background:var(--brand);color:#fff!important;padding:10px 16px;font-weight:600;text-decoration:none;cursor:pointer;font-size:1rem;font-family:inherit}
.btn:hover{filter:brightness(1.08)}.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn-sm{padding:6px 12px;font-size:.9rem}.btn-lg{padding:14px 22px;font-size:1.05rem}
.btn-ghost{background:#fff;color:var(--ink)!important;border:1px solid var(--line)}
.hero{background:radial-gradient(1200px 400px at 10% -10%,#e0e7ff,transparent),radial-gradient(900px 400px at 100% 0,#f3e8ff,transparent);padding:56px 0 40px}
.hero-in{display:grid;grid-template-columns:1.15fr 1fr;gap:40px;align-items:center}
.eyebrow{color:var(--brand2);font-weight:700;text-transform:uppercase;font-size:.8rem;letter-spacing:.08em}
.hl{background:linear-gradient(90deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:1.15rem;color:#334155}.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0 8px}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 20px 50px -20px rgba(79,70,229,.35)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:28px auto}
.link-card{text-decoration:none;color:var(--ink);transition:transform .1s}.link-card:hover{transform:translateY(-2px);border-color:#c7d2fe}
.integrity{margin:30px auto 50px}
.q{margin:14px 0}.q-tag{font-size:.78rem;color:var(--brand2);font-weight:700;text-transform:uppercase;letter-spacing:.06em}
.q-stem{font-weight:600;font-size:1.05rem}.opts{list-style:none;padding:0;margin:8px 0}
.opts li{border:1px solid var(--line);border-radius:10px;margin:6px 0;padding:0}
.opts li label{display:block;padding:10px 12px;cursor:pointer}.opts.demo li{padding:10px 12px}
.opts li.correct{border-color:var(--ok);background:#ecfdf5}.opts li.wrong{border-color:var(--bad);background:#fef2f2}
.expl{background:#f1f5f9;border-radius:10px;padding:10px 12px;margin-top:8px}
.flag{color:var(--warn)}.checker{background:#eef2ff;border-radius:10px;padding:8px 12px}
.quiz-bar{display:flex;gap:16px;align-items:center;margin:18px 0 30px}.score{font-weight:700;font-size:1.1rem}
.form label{display:block;font-weight:600;margin:12px 0}.form input:not([type=checkbox]):not([type=radio]),.form textarea,.q textarea{display:block;width:100%;margin-top:6px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;font:inherit;background:#fff}
.form label.check{font-weight:400;display:flex;gap:8px;align-items:flex-start}
.row3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.or{text-align:center;color:var(--muted);margin:6px 0}
.alert{background:#fef2f2;border:1px solid #fecaca;color:#991b1b;border-radius:10px;padding:10px 12px;margin:12px 0}
.alert.ok{background:#ecfdf5;border-color:#a7f3d0;color:#065f46}
.loading{margin-top:12px;color:var(--brand);font-weight:600}
.auth{max-width:460px;margin:40px auto}.magic{border-top:1px solid var(--line);margin-top:20px;padding-top:8px}
.set-head{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;flex-wrap:wrap}
.set-actions{display:flex;gap:8px;flex-wrap:wrap}
.tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin:20px 0 6px}
.tab{background:none;border:0;padding:10px 14px;font:inherit;font-weight:600;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent}
.tab.active{color:var(--brand);border-color:var(--brand)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:18px 0 40px}
.flash{min-height:150px;border:1px solid var(--line);border-radius:var(--r);background:#fff;padding:16px;font:inherit;text-align:left;cursor:pointer}
.flash .back{display:none;color:#334155}.flash.flipped{background:#eef2ff}.flash.flipped .front{display:none}.flash.flipped .back{display:block}
.flash .front{font-weight:600}
.key li{margin:8px 0}.pricing .plan{display:flex;flex-direction:column;gap:6px}.plan .price{font-size:2rem;font-weight:800;margin:0}.plan .price span{font-size:1rem;color:var(--muted)}
.plan.featured{border:2px solid var(--brand);box-shadow:0 20px 40px -24px rgba(79,70,229,.5)}.plan ul{padding-left:18px;flex:1}
.upsell{background:linear-gradient(135deg,#eef2ff,#faf5ff);margin:28px 0}
.crumbs{margin-top:20px}.legal h2{font-size:1.2rem;margin-top:1.6em}
.set-list li{margin:6px 0}.inline{display:inline}
.foot{border-top:1px solid var(--line);background:#fff;margin-top:40px;padding:26px 0}
.foot-in{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:10px}.foot-links{display:flex;gap:14px;flex-wrap:wrap}
@media (max-width:820px){.hero-in,.grid3{grid-template-columns:1fr}.nav nav a:not(.btn){display:none}.row3{grid-template-columns:1fr 1fr 1fr}}
@media print{.nav,.foot,.tabs,.set-actions,.quiz-bar,.checker{display:none}.panel[hidden]{display:block!important}.expl[hidden]{display:block!important}.card{border:0;padding:0}}