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var(--t-fast) var(--ease-bounce);box-shadow:0 2px 0 var(--border)}.choice-btn:hover:not(:disabled){background:var(--bg-subtle);border-color:var(--brand-border);transform:translateY(-2px);box-shadow:0 4px 0 var(--border-strong)}.choice-btn:active:not(:disabled){transform:translateY(2px);box-shadow:0 1px 0 var(--border-strong)}.choice-btn__key{width:28px;height:28px;border-radius:var(--r-sm);background:var(--bg-subtle);border:1px solid var(--border);display:grid;place-items:center;font-size:13px;font-weight:800;color:var(--ink-secondary);flex-shrink:0}.choice-btn--selected{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-text);box-shadow:0 3px 0 var(--brand)}.choice-btn--selected .choice-btn__key{background:var(--fill-accent);color:var(--on-accent);border-color:var(--fill-accent)}.choice-btn--correct{border-color:var(--success)!important;background:var(--success-soft)!important;color:var(--success-text)!important;box-shadow:0 3px 0 var(--success)!important}.choice-btn--correct .choice-btn__key{background:var(--success)!important;color:var(--on-success)!important;border-color:var(--success)!important}.choice-btn--wrong{border-color:var(--danger)!important;background:var(--danger-soft)!important;color:var(--danger-text)!important;box-shadow:0 3px 0 var(--danger)!important}.choice-btn--wrong .choice-btn__key{background:var(--danger)!important;color:var(--on-danger)!important;border-color:var(--danger)!important}.stat{text-align:center}.stat__value{font-size:28px;font-weight:900;line-height:1.1}.stat__label{font-size:12.5px;color:var(--ink-muted);font-weight:600;margin-top:4px}.table-wrap{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}.table{width:100%;border-collapse:collapse;font-size:14px}.table th{padding:12px 10px;text-align:left;font-weight:700;color:var(--ink-muted);font-size:12px;text-transform:uppercase;letter-spacing:.05em;border-bottom:2px solid var(--border);white-space:nowrap}.table td{padding:12px 10px;border-bottom:1px solid var(--border);vertical-align:middle}.table tr:last-child td{border-bottom:none}.empty{text-align:center;padding:var(--sp-10) var(--sp-4);color:var(--ink-muted)}.empty__icon{font-size:44px;margin-bottom:var(--sp-3);line-height:1}.empty__text{font-size:15px;font-weight:600}@keyframes fadeUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes popIn{0%{transform:scale(.96);opacity:0}to{transform:scale(1);opacity:1}}.anim-pop{animation:popIn .25s var(--ease-out)}.anim-fade{animation:fadeUp .3s var(--ease-out)}.anim-glow{box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) .08,transparent)}.math{display:inline}.math--block{display:block;text-align:center;margin:var(--sp-2) 0;overflow-x:auto;overflow-y:hidden}.math--inline{display:inline-block;vertical-align:middle}.math--fallback{font-family:var(--font-math, monospace);font-style:italic}.katex,.katex *{box-sizing:content-box!important}.katex .vlist-t{border-collapse:separate!important}.katex{color:inherit;font-size:1.05em}.katex-display{overflow-x:auto;overflow-y:hidden;padding:6px 0;margin:8px 0}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.text-sm{font-size:13.5px}.text-xs{font-size:11.5px}.text-lg{font-size:18px}.text-muted{color:var(--ink-muted)}.text-faint{color:var(--ink-faint)}.text-brand{color:var(--brand)}.text-success{color:var(--success)}.text-warn{color:var(--warn)}.text-danger{color:var(--danger)}.fw-600{font-weight:600}.fw-700{font-weight:700}.fw-800{font-weight:800}.fw-900{font-weight:900}.flex{display:flex}.flex-col{flex-direction:column}.flex-wrap{flex-wrap:wrap}.flex-1{flex:1}.items-center{align-items:center}.items-start{align-items:flex-start}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.gap-1{gap:var(--sp-1)}.gap-2{gap:var(--sp-2)}.gap-3{gap:var(--sp-3)}.gap-4{gap:var(--sp-4)}.gap-6{gap:var(--sp-6)}.mt-1{margin-top:var(--sp-1)}.mt-2{margin-top:var(--sp-2)}.mt-3{margin-top:var(--sp-3)}.mt-4{margin-top:var(--sp-4)}.mt-6{margin-top:var(--sp-6)}.mt-8{margin-top:var(--sp-8)}.mb-1{margin-bottom:var(--sp-1)}.mb-2{margin-bottom:var(--sp-2)}.mb-3{margin-bottom:var(--sp-3)}.mb-4{margin-bottom:var(--sp-4)}.mb-6{margin-bottom:var(--sp-6)}.mb-8{margin-bottom:var(--sp-8)}@media (max-width: 480px){.page{padding:var(--sp-4) var(--sp-3)}.btn--lg{white-space:normal;line-height:1.3;padding:12px 18px;font-size:15px}h1{font-size:22px!important}h2{font-size:18px!important}.card{padding:var(--sp-4);border-radius:var(--r-lg)}}