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24px}#new-set-corner{display:flex;align-items:center;gap:12px;color:var(--text-secondary);font-size:.9rem;flex-shrink:0;margin-top:8px}#error-toast{position:fixed;bottom:32px;left:50%;transform:translate(-50%) translateY(200px);opacity:0;background:#1a0a0a;border:1px solid var(--incorrect);border-radius:var(--radius);color:#fca5a5;padding:16px 20px;max-width:480px;width:calc(100% - 48px);font-size:.9rem;white-space:pre-wrap;z-index:100;transition:transform .3s ease,opacity .3s ease;pointer-events:none}#error-toast.visible{transform:translate(-50%) translateY(0);opacity:1;pointer-events:auto}#error-toast .toast-close{position:absolute;top:10px;right:12px;background:none;border:none;color:#fca5a5;font-size:1.1rem;cursor:pointer}#quiz-header{display:flex;align-items:center;gap:16px;margin-bottom:28px}#quiz-abandon-btn{background:none;border:none;color:var(--text-secondary);font-size:1rem;padding:4px 8px;flex-shrink:0}#quiz-abandon-btn:hover{color:var(--text-primary)}#quiz-progress-text{font-size:.88rem;color:var(--text-secondary);white-space:nowrap;flex-shrink:0}#quiz-progress-bar{flex:1;height:4px;background:var(--surface-hover);border-radius:2px;overflow:hidden}#quiz-progress-fill{height:100%;background:var(--accent);border-radius:2px;transition:width .3s ease;width:0%}.graph-area{height:240px;margin-bottom:20px;border-radius:var(--radius);overflow:hidden;position:relative;padding:26px 10px 22px 42px}.graph-area canvas{display:block;width:100%!important;height:100%!important}.graph-title{position:absolute;top:4px;left:0;right:0;text-align:center;font-size:.8rem;color:#f1f0ffd9;pointer-events:none}.graph-xlabel{position:absolute;bottom:2px;left:0;right:0;text-align:center;font-size:.78rem;color:#f1f0ff99;pointer-events:none}.graph-ylabel{position:absolute;left:20px;top:50%;transform:translateY(-50%) rotate(-90deg);transform-origin:left center;font-size:.78rem;color:#f1f0ff99;white-space:nowrap;pointer-events:none}.graph-title .katex,.graph-xlabel .katex,.graph-ylabel .katex{font-size:1em}.graph-error{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);font-size:.9rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}#quiz-question-text,#review-question-text{font-size:1.2rem;line-height:1.7;margin-bottom:28px}.answer-btn{display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 18px;margin-bottom:10px;color:var(--text-primary);font-size:1rem;transition:background .15s,border-color .15s,transform .1s}.answer-btn:not(:disabled):not(.selected-answer):hover{background:var(--surface-hover);border-color:#fff3}.answer-btn:not(:disabled):active{transform:scale(.97)}.answer-btn:disabled{cursor:default}.answer-btn.correct-answer{background:#22c55e26!important;border-color:var(--correct)!important;opacity:1!important}.answer-btn.wrong-answer{background:#ef444426!important;border-color:var(--incorrect)!important;opacity:1!important}.answer-btn.selected-answer{border-color:var(--accent-light);background:#7c3aed1f}.answer-label{font-size:.82rem;font-weight:700;color:var(--accent-light);flex-shrink:0;width:18px}.answer-text{flex:1}#quiz-feedback{display:flex;align-items:center;gap:12px;margin-top:20px;min-height:44px}#quiz-feedback-msg{flex:1;font-size:.9rem}#quiz-feedback-msg.correct{color:var(--correct)}#quiz-feedback-msg.incorrect{color:var(--incorrect)}.screen-header{display:flex;align-items:center;gap:16px;margin-bottom:16px}#mode-screen .deck-subtitle{color:var(--text-secondary);font-size:.9rem;margin:0 0 32px}.mode-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:28px}.mode-card{padding:24px 20px;cursor:pointer;text-align:left;border:2px solid var(--border);background:var(--surface);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);border-radius:var(--radius);transition:border-color .15s,background .15s;-webkit-user-select:none;user-select:none}.mode-card:hover{background:var(--surface-hover)}.mode-card.selected{border-color:var(--accent-light);background:#7c3aed1f}.mode-card .mode-icon{font-size:1.6rem;margin-bottom:10px}.mode-card .mode-name{font-size:1rem;font-weight:600;color:var(--text-primary);margin-bottom:6px}.mode-card .mode-desc{font-size:.82rem;color:var(--text-secondary);line-height:1.5}.mode-options{display:flex;align-items:center;gap:12px;margin-bottom:28px;min-height:36px}.toggle-label{display:flex;align-items:center;gap:10px;cursor:pointer;color:var(--text-secondary);font-size:.9rem;-webkit-user-select:none;user-select:none}.toggle-label input[type=checkbox]{display:none}.toggle-track{width:38px;height:22px;background:var(--surface-hover);border:1px solid var(--border);border-radius:11px;position:relative;transition:background .2s,border-color .2s;flex-shrink:0}.toggle-track:after{content:"";position:absolute;top:3px;left:3px;width:14px;height:14px;background:var(--text-secondary);border-radius:50%;transition:transform .2s,background .2s}.toggle-label input:checked+.toggle-track{background:var(--accent);border-color:var(--accent)}.toggle-label input:checked+.toggle-track:after{transform:translate(16px);background:#fff}#mode-start-btn{padding:12px 36px;font-size:1rem}.stats-summary{display:flex;align-items:center;gap:32px;margin-bottom:32px;flex-wrap:wrap}.stats-pie-wrap{position:relative;width:150px;height:150px;flex-shrink:0}.stats-pie-center{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;pointer-events:none}#stats-score-pct{font-size:1.7rem;font-weight:700;color:var(--text-primary)}#stats-score-line{font-size:1.15rem;font-weight:600;margin-bottom:6px}#stats-duration-line{color:var(--text-secondary);font-size:.85rem}.breakdown-item{padding:14px 18px;margin-bottom:10px}.breakdown-correct-top{display:flex;align-items:center;gap:10px}.breakdown-check{color:var(--correct);flex-shrink:0}.breakdown-q-collapsed{flex:1;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.92rem}.breakdown-item.wrong .breakdown-q-text{margin-bottom:12px;font-size:1rem;line-height:1.5}.breakdown-answer-row{font-size:.88rem;margin-bottom:6px}.breakdown-answer-row.wrong-row{color:var(--incorrect)}.breakdown-answer-row.correct-row{color:var(--correct)}.copy-ai-btn{margin-top:8px;font-size:.82rem;padding:6px 14px}.stats-actions{display:flex;gap:12px;margin-top:24px}#retake-modal{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;display:flex;align-items:center;justify-content:center;z-index:200}.retake-modal-card{padding:28px;display:flex;flex-direction:column;gap:12px;min-width:260px;text-align:center}.retake-modal-card p{margin:0 0 8px;color:var(--text-secondary)}.review-progress-text{color:var(--text-secondary);font-size:.88rem;margin-left:auto}#review-answer-list .answer-btn{cursor:default}.review-nav{display:flex;justify-content:space-between;margin-top:24px}.review-nav button:disabled{opacity:.35;cursor:default}.flash-options{display:flex;gap:24px;margin-bottom:16px}#flash-card-wrap{display:flex;justify-content:center;margin:32px 0 16px}#flash-card{width:100%;max-width:480px;height:280px;perspective:1000px;cursor:pointer}.card-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .4s ease}#flash-card.flipped .card-inner{transform:rotateY(180deg)}.card-front,.card-back{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;display:flex;align-items:center;justify-content:center;padding:32px;text-align:center;font-size:1.3rem;line-height:1.6;background:var(--surface);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);border:1px solid var(--border);border-radius:var(--radius)}.card-back{transform:rotateY(180deg);color:var(--accent-light)}#flash-card.sort-known{animation:flash-slide-out .35s ease forwards}#flash-card.sort-learning{animation:flash-shake .35s ease}@keyframes flash-slide-out{to{transform:translate(120%) rotate(8deg);opacity:0}}@keyframes flash-shake{0%,to{transform:translate(0)}25%{transform:translate(-10px)}75%{transform:translate(10px)}}.flash-hint{text-align:center;color:var(--text-secondary);font-size:.85rem;margin:0 0 24px}.flash-actions{display:flex;justify-content:center;gap:16px}.flash-complete-card{padding:32px;text-align:center;max-width:420px;margin:40px auto 0}.flash-complete-card h3{margin-bottom:12px}.flash-complete-card p{color:var(--text-secondary);margin-bottom:20px}