*{box-sizing:border-box}body{color:#fff;background:#0d0f14;min-height:100vh;margin:0;font-family:Inter,system-ui,Arial}.shell{max-width:1100px;min-height:100vh;margin:auto;padding:24px}header{justify-content:space-between;align-items:center;margin-bottom:24px;display:flex}.brand{font-size:25px;font-weight:800}.welcome{opacity:.65}.score{font-size:22px;font-weight:800}.home{grid-template-columns:340px 1fr;gap:22px;display:grid}aside,.start-card,.quiz,.result{background:#171a22;border:1px solid #272c38;border-radius:22px;padding:24px}aside h2{margin-top:0}.row{border-bottom:1px solid #252a34;align-items:center;gap:12px;padding:12px 8px;display:flex}.rank{width:28px;font-weight:800}.name{text-overflow:ellipsis;white-space:nowrap;flex:1;overflow:hidden}.points{font-weight:800}.start-card{text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:430px;display:flex}.badge{letter-spacing:2px;opacity:.65;font-size:12px;font-weight:800}.start-card h1,.result h1{margin:16px 0 8px;font-size:44px}.start-card p{opacity:.7;max-width:520px;line-height:1.6}.start-card button,.result button{cursor:pointer;color:#111;background:#fff;border:0;border-radius:14px;margin-top:24px;padding:18px 50px;font-size:20px;font-weight:900}.quiz-top{opacity:.75;justify-content:space-between;display:flex}.quiz h1{margin:50px 0 25px;font-size:32px;line-height:1.25}.options{display:grid}.option{color:#fff;text-align:left;cursor:pointer;background:#20242e;border:1px solid #343a48;border-radius:14px;width:100%;margin:8px 0;padding:18px;font-size:18px}.option:hover{background:#292e39}.option:disabled{opacity:.65;cursor:default}.correct{border-color:#58d68d!important}.wrong{border-color:#ff6b6b!important}.hidden{display:none!important}#feedback{min-height:28px;margin-top:15px;font-weight:700}.result{text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:430px;display:flex}.final-points{margin:15px;font-size:56px;font-weight:900}.error{color:#ff8b8b;margin-top:15px}@media (width<=760px){.shell{padding:14px}.home{grid-template-columns:1fr}aside{order:2}.start-card h1,.result h1{font-size:34px}.quiz h1{font-size:25px}}