:root{--navy:#12233f;--blue:#2667d8;--light:#eef4ff;--gold:#f6b73c;--green:#16865c;--red:#c83f49;--ink:#172033;--muted:#657086;--border:#d8e0ee}*{box-sizing:border-box}body{margin:0;background:#f5f7fb;color:var(--ink);font:16px/1.55 Inter,system-ui,-apple-system,Segoe UI,sans-serif}.topbar{height:68px;background:var(--navy);color:#fff;display:flex;align-items:center;padding:0 28px;gap:24px;position:sticky;top:0;z-index:10}.brand{color:#fff;text-decoration:none;font-weight:800}.brand-mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--gold);color:var(--navy);margin-right:8px}.test-name{flex:1;text-align:center;font-weight:700}.timer{font-size:1.2rem;font-variant-numeric:tabular-nums;background:#20385d;padding:8px 14px;border-radius:9px}main{max-width:1180px;margin:36px auto;padding:0 20px}.card{background:#fff;border:1px solid var(--border);border-radius:18px;box-shadow:0 12px 36px rgba(18,35,63,.08)}.welcome{max-width:760px;margin:70px auto;padding:48px}.eyebrow{font-weight:800;letter-spacing:.12em;font-size:.75rem;color:var(--blue)}h1{font-size:2.35rem;line-height:1.15;margin:.45rem 0 1rem}h2{font-size:1.2rem}.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:28px 0}.facts div{background:var(--light);padding:18px;border-radius:12px;text-align:center}.facts strong{display:block;font-size:1.8rem}.facts span{color:var(--muted)}button{font:inherit;font-weight:750;cursor:pointer;border-radius:10px;border:0;padding:12px 18px}.primary{background:var(--blue);color:#fff}.secondary{background:#edf1f7;color:var(--navy)}.desmos{background:#111;color:#fff}.hidden{display:none!important}.testing{display:grid;grid-template-columns:240px 1fr;gap:24px}.sidebar{background:#fff;border:1px solid var(--border);border-radius:16px;padding:18px;height:max-content;position:sticky;top:92px}.module-label{font-weight:850;margin-bottom:14px}.question-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.question-grid button{padding:7px 0;border:1px solid var(--border);background:#fff}.question-grid button.current{outline:3px solid #9fbef6}.question-grid button.has-answer{background:var(--blue);color:#fff}.question-grid button.flagged{box-shadow:inset 0 -4px var(--gold)}.legend{display:flex;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:.78rem;margin-top:14px}.legend i{display:inline-block;width:10px;height:10px;margin-right:4px;border-radius:2px}.legend .answered{background:var(--blue)}.legend .review{background:var(--gold)}.question-card{min-height:610px;padding:34px;display:flex;flex-direction:column}.question-meta{display:flex;justify-content:space-between;border-bottom:1px solid var(--border);padding-bottom:15px;color:var(--muted);font-weight:700}.text-button{background:transparent;padding:0;color:#946a00}.prompt{font-size:1.23rem;margin:40px 0 28px;min-height:72px}.choices{display:grid;gap:12px}.choice{display:flex;align-items:center;gap:14px;border:2px solid var(--border);background:#fff;text-align:left;padding:16px}.choice:hover{border-color:#8eb0eb}.choice.selected{border-color:var(--blue);background:var(--light)}.choice-key{display:grid;place-items:center;width:34px;height:34px;min-width:34px;border-radius:50%;border:1px solid var(--border)}.selected .choice-key{background:var(--blue);color:#fff}.question-actions{display:flex;justify-content:space-between;gap:12px;margin-top:auto;padding-top:28px}.score-card{padding:32px;display:flex;justify-content:space-between;align-items:center}.score{font-size:4rem;font-weight:900;color:var(--navy);line-height:1}.score-range{color:var(--muted)}.accuracy-ring{width:130px;height:130px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--green) 0%,#e6ebf3 0)}.accuracy-ring:before{content:'';position:absolute;width:98px;height:98px;background:#fff;border-radius:50%}.accuracy-ring span{position:relative;font-weight:850}.report-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:20px 0}.report-grid .card{padding:24px}.metric{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid #edf0f5}.review-item{border-top:1px solid var(--border);padding:20px 0}.review-head{display:flex;justify-content:space-between;gap:12px}.wrong{color:var(--red);font-weight:800}.right{color:var(--green);font-weight:800}.explanation{background:#f7f9fc;padding:14px;border-radius:10px;margin-top:10px}.basic{border-left:4px solid var(--gold)}.toast{position:fixed;bottom:22px;right:22px;background:var(--navy);color:#fff;padding:12px 18px;border-radius:10px;opacity:0;transform:translateY(10px);transition:.2s;pointer-events:none}.toast.show{opacity:1;transform:none}@media(max-width:800px){.test-name{display:none}.testing{grid-template-columns:1fr}.sidebar{position:static}.question-card{min-height:560px}.report-grid{grid-template-columns:1fr}.welcome{padding:28px;margin:25px auto}.facts{grid-template-columns:1fr}.question-actions{flex-wrap:wrap}.desmos{order:3;width:100%}}