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.1s}.flash-review-actions button:active{transform:scale(.97)}.flash-again{background:var(--red-bg);color:var(--red)}.flash-hard{background:var(--accent-soft);color:var(--accent)}.flash-easy{background:var(--green-bg);color:var(--brand-strong)}.flash-empty{text-align:center;padding:3rem 1rem;color:var(--text-dim)}.flash-deck-picker{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.5rem}.flash-deck-picker button{font-family:var(--sans);background:var(--bg-soft);border:1px solid var(--border);color:var(--text);border-radius:99px;padding:.5rem 1rem;font-size:.83rem;font-weight:500;cursor:pointer;transition:all .15s}.flash-deck-picker button.active{background:var(--brand);border-color:var(--brand);color:#fff}@media (max-width: 640px){.app{padding:1.25rem 1rem 3rem}.header{flex-direction:column;align-items:flex-start}.header h1{font-size:1.3rem}.header-nav{flex-wrap:wrap}.topic-content{padding:1.5rem 1.3rem}.quiz-actions{flex-direction:column;align-items:stretch}.continue-card{flex-direction:column;align-items:flex-start}.flash-review-actions{grid-template-columns:1fr}}