.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--space-md);background:linear-gradient(135deg,#667eea,#764ba2)}.login-card{width:100%;max-width:400px;padding:var(--space-2xl);text-align:center}.login-logo{margin-bottom:var(--space-lg)}.login-hanzi{font-family:var(--font-sans);font-size:4rem;color:var(--color-primary);display:block;line-height:1;margin-bottom:var(--space-sm)}.login-logo h1{font-size:1.5rem;color:var(--text-primary)}.login-subtitle{color:var(--text-secondary);margin-bottom:var(--space-xl)}.login-form{display:flex;flex-direction:column;gap:var(--space-md)}.form-group{text-align:left}.error-message{background:#ef44441a;color:var(--color-danger);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);font-size:.875rem;cursor:pointer}.login-footer{margin-top:var(--space-lg);font-size:.75rem}.setup-header{text-align:center;margin-bottom:var(--space-xl);padding-top:var(--space-lg)}.setup-content{max-width:600px;margin:0 auto}.setup-section{margin-bottom:var(--space-lg)}.setup-section h2{margin-bottom:var(--space-md);font-size:1.125rem}.deck-grid{display:grid;gap:var(--space-sm)}.deck-option{display:flex;justify-content:space-between;align-items:center;padding:var(--space-md);border:2px solid var(--color-gray-200);border-radius:var(--radius-md);background:var(--bg-card);cursor:pointer;transition:all var(--transition-fast)}.deck-option:hover{border-color:var(--color-primary-light)}.deck-option.selected{border-color:var(--color-primary);background:#6366f11a}.deck-option-name{font-weight:500}.deck-option-count{color:var(--text-muted);font-size:.875rem}.tag-grid{display:flex;flex-wrap:wrap;gap:var(--space-sm)}.tag-option{padding:var(--space-xs) var(--space-md);border:1px solid var(--color-gray-300);border-radius:var(--radius-full);background:var(--bg-card);font-size:.875rem;cursor:pointer;transition:all var(--transition-fast)}.tag-option:hover{border-color:var(--color-primary)}.tag-option.selected{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.settings-grid{display:grid;gap:var(--space-lg)}.setting-item label{display:block;margin-bottom:var(--space-sm)}.setting-controls{display:flex;align-items:center;gap:var(--space-sm)}.setting-controls input{width:80px;text-align:center}.setup-actions{text-align:center;padding:var(--space-xl) 0}.setup-actions .error-message{max-width:400px;margin:0 auto var(--space-md);background:#ef44441a;color:var(--color-danger);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md)}.mode-options{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-md)}.mode-option{display:flex;flex-direction:column;align-items:center;gap:var(--space-xs);padding:var(--space-lg);border:2px solid var(--color-gray-200);border-radius:var(--radius-lg);background:var(--bg-card);cursor:pointer;transition:all var(--transition-fast)}.mode-option:hover{border-color:var(--color-primary-light);transform:translateY(-2px)}.mode-option.selected{border-color:var(--color-primary);background:#6366f11a;box-shadow:0 0 0 3px #6366f133}.mode-icon{font-size:2rem}.mode-name{font-weight:600;font-size:1.125rem}.mode-desc{font-size:.75rem;color:var(--text-muted)}.all-cards-btn{margin-left:var(--space-xs);padding:0 var(--space-md);border:2px solid var(--color-gray-300);border-radius:var(--radius-full);background:var(--bg-card);color:var(--text-secondary);font-weight:600;font-size:.8rem;white-space:nowrap;transition:all var(--transition-fast)}.all-cards-btn:hover{border-color:var(--color-primary);color:var(--color-primary)}.all-cards-btn--active{border-color:var(--color-primary);background:var(--color-primary);color:#fff;box-shadow:0 0 0 3px #6366f140}.all-cards-btn--active:hover{background:var(--color-primary-dark, var(--color-primary));color:#fff}.setting-controls input:disabled,.setting-controls button:disabled{opacity:.35;cursor:not-allowed}.deck-section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-md)}.deck-section-header h2{margin-bottom:0}.study-all-toggle{padding:var(--space-xs) var(--space-md);border:2px solid var(--color-primary);border-radius:var(--radius-full);background:transparent;color:var(--color-primary);font-weight:600;font-size:.8rem;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap}.study-all-toggle:hover{background:#6366f11a}.study-all-toggle--active{background:var(--color-primary);color:#fff;box-shadow:0 0 0 3px #6366f140}.study-all-toggle--active:hover{background:var(--color-primary-dark, var(--color-primary));color:#fff}.deck-grid--locked .deck-option{pointer-events:none;opacity:.55}.deck-grid--locked .deck-option.selected{opacity:1;border-color:var(--color-primary);background:#6366f11a}.flashcard{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:50vh;padding:var(--space-xl);text-align:center;position:relative}.flashcard-hanzi{margin-bottom:var(--space-lg);transition:transform var(--transition-normal)}.flashcard-pinyin,.flashcard-english{opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity var(--transition-normal),transform var(--transition-normal),visibility 0s var(--transition-normal);pointer-events:none}.flashcard-pinyin.visible,.flashcard-english.visible{opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto;transition:opacity var(--transition-normal),transform var(--transition-normal),visibility 0s}.flashcard-pinyin{margin-bottom:var(--space-md)}.flashcard-english{font-size:1.25rem;max-width:400px}@media(max-width:768px){.flashcard-english{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}}.missing-data{color:var(--text-muted);font-style:italic}.flashcard-image{width:120px;height:120px;margin-bottom:var(--space-md);border-radius:var(--radius-lg);overflow:hidden;opacity:0;transform:scale(.9);transition:opacity var(--transition-normal),transform var(--transition-normal)}.flashcard-image.visible{opacity:1;transform:scale(1)}.flashcard-image img{width:100%;height:100%;object-fit:cover}.card-type-badge{position:absolute;top:var(--space-md);right:var(--space-md);padding:var(--space-xs) var(--space-sm);background:var(--color-gray-100);color:var(--text-muted);font-size:.75rem;border-radius:var(--radius-sm)}.grade-controls{display:flex;justify-content:center;gap:var(--space-sm);max-width:500px;margin:0 auto}.grade-btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-md);border-radius:var(--radius-md);font-weight:500;transition:all var(--transition-fast);min-height:60px}.grade-btn:disabled{opacity:.5;cursor:not-allowed}.grade-number{font-size:.75rem;opacity:.7;margin-bottom:2px}.grade-label{font-size:.875rem}.grade-again{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff}.grade-again:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #ef444466}.grade-hard{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff}.grade-hard:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #f59e0b66}.grade-good{background:linear-gradient(135deg,#22c55e,#16a34a);color:#fff}.grade-good:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #22c55e66}.grade-easy{background:linear-gradient(135deg,#6366f1,#4f46e5);color:#fff}.grade-easy:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #6366f166}@media(max-width:768px){.grade-btn{padding:var(--space-sm);min-height:50px}.grade-label{font-size:.75rem}}.audio-btn{display:flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:50%;background:var(--bg-card);border:2px solid var(--color-gray-300);cursor:pointer;transition:all var(--transition-fast);margin-top:var(--space-lg)}.audio-btn:hover{border-color:var(--color-primary);transform:scale(1.1)}.audio-btn.playing{border-color:var(--color-primary);background:#6366f11a}.audio-btn.error{border-color:var(--color-danger);cursor:not-allowed}.audio-icon{font-size:1.5rem}.audio-icon.playing{animation:pulse 1s ease-in-out infinite}.audio-icon.error{opacity:.5}.audio-spinner{width:24px;height:24px;border:3px solid var(--color-gray-200);border-top-color:var(--color-primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.audio-btn.small{width:36px;height:36px;margin-top:0}.audio-btn.small .audio-icon{font-size:1rem}.audio-btn.small .audio-spinner{width:16px;height:16px;border-width:2px}.study-page{min-height:calc(100vh - 64px);display:flex;flex-direction:column;background:var(--bg-secondary);padding-bottom:100px}.study-progress{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md);background:var(--bg-card);border-bottom:1px solid var(--color-gray-200)}.progress-bar{flex:1;height:8px;background:var(--color-gray-200);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));border-radius:var(--radius-full);transition:width var(--transition-normal)}.progress-text{font-size:.875rem;color:var(--text-muted);min-width:60px;text-align:right}.flashcard-container{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-lg);cursor:pointer;-webkit-user-select:none;user-select:none}.grade-container{position:fixed;bottom:80px;left:0;right:0;padding:var(--space-md);background:var(--bg-card);border-top:1px solid var(--color-gray-200);transform:translateY(100%);transition:transform var(--transition-normal)}.grade-container.visible{transform:translateY(0)}@media(min-width:769px){.grade-container{bottom:0}}.reveal-hint{text-align:center;padding:var(--space-md);color:var(--text-muted);font-size:.875rem}.menu-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;padding:var(--space-md);z-index:200}.menu-card{width:100%;max-width:300px;display:flex;flex-direction:column;gap:var(--space-md);text-align:center}.study-error{position:fixed;top:80px;left:50%;transform:translate(-50%);background:#ef4444e6;color:#fff;padding:var(--space-sm) var(--space-lg);border-radius:var(--radius-md);z-index:100}.summary-content{max-width:500px;margin:0 auto;padding:var(--space-xl) var(--space-md);text-align:center}.summary-header{margin-bottom:var(--space-xl)}.summary-emoji{font-size:4rem;display:block;margin-bottom:var(--space-md)}.summary-stats{margin-bottom:var(--space-xl)}.session-score{margin-bottom:var(--space-lg);padding:var(--space-lg)}.session-score h2{margin-bottom:var(--space-md)}.score-display{display:flex;justify-content:center;align-items:baseline;gap:var(--space-xs);font-size:3rem;font-weight:700}.score-correct{color:var(--color-success)}.score-divider{color:var(--text-muted)}.score-total{color:var(--text-secondary)}.score-label{margin-top:var(--space-sm);font-size:1.1rem;color:var(--text-secondary)}.summary-stats h2{margin-bottom:var(--space-lg)}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-md)}.stat-item{display:flex;flex-direction:column;align-items:center}.stat-value{font-size:2rem;font-weight:700;color:var(--color-primary)}.stat-label{font-size:.875rem;color:var(--text-muted)}.summary-actions{display:flex;flex-direction:column;gap:var(--space-md);margin-bottom:var(--space-xl)}.summary-tip{font-size:.875rem}.quiz-page{display:flex;flex-direction:column;min-height:100vh;padding:var(--space-md);max-width:600px;margin:0 auto}.quiz-progress{display:flex;align-items:center;gap:var(--space-md);margin-bottom:var(--space-lg)}.quiz-progress .progress-bar{flex:1;height:8px;background:var(--color-gray-200);border-radius:var(--radius-full);overflow:hidden}.quiz-progress .progress-fill{height:100%;background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));transition:width var(--transition-normal)}.quiz-progress .progress-text{font-size:.875rem;color:var(--text-secondary);white-space:nowrap}.quiz-card{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-2xl);margin-bottom:var(--space-xl);min-height:200px}.quiz-input-area{display:flex;flex-direction:column;gap:var(--space-md);margin-bottom:var(--space-lg)}.quiz-input{font-size:1.5rem;padding:var(--space-md) var(--space-lg);text-align:center;border:2px solid var(--color-gray-300);border-radius:var(--radius-lg);transition:all var(--transition-fast)}.quiz-input:focus{border-color:var(--color-primary);box-shadow:0 0 0 4px #6366f133}.quiz-input.correct{border-color:var(--color-success);background:#22c55e1a}.quiz-input.incorrect{border-color:var(--color-danger);background:#ef44441a}.quiz-feedback{display:flex;flex-direction:column;align-items:center;gap:var(--space-xs);padding:var(--space-md);border-radius:var(--radius-md);animation:fadeIn var(--transition-normal) ease-out}.quiz-feedback.correct{background:#22c55e26;color:var(--color-success)}.quiz-feedback.incorrect{background:#ef444426;color:var(--color-danger)}.quiz-feedback .feedback-icon{font-size:1.25rem;font-weight:600}.quiz-feedback .correct-answer{font-size:1.125rem;color:var(--text-primary)}.quiz-feedback .correct-answer strong{font-family:var(--font-sans);color:var(--color-primary)}.quiz-buttons{display:flex;gap:var(--space-md)}.quiz-buttons .flex-1{flex:1}.quiz-buttons-3col{display:grid;grid-template-columns:1fr 1.5fr 1fr;gap:var(--space-md);align-items:center}.btn-slot{display:flex}.btn-slot-left{justify-content:flex-start}.btn-slot-center{justify-content:center}.btn-slot-center .btn{width:100%}.btn-slot-right{justify-content:flex-end}.quiz-buttons-3col .btn,.review-nav-3col .btn{white-space:nowrap;width:100%}.review-nav-3col{display:grid;grid-template-columns:1fr 1.5fr 1fr;gap:var(--space-md);margin-top:var(--space-xl);align-items:center}.review-nav-3col .btn-slot-center .btn{width:100%}.quiz-hint{text-align:center;font-size:.875rem}.hint-button{padding:var(--space-xs) var(--space-md);background:transparent;border:1px dashed var(--color-gray-400);border-radius:var(--radius-md);color:var(--text-muted);font-size:.875rem;cursor:pointer;transition:all var(--transition-fast)}.hint-button:hover{border-color:var(--color-primary);color:var(--color-primary)}.shortcuts-hint{text-align:center;font-size:.75rem;margin-top:var(--space-lg);padding-top:var(--space-md);border-top:1px solid var(--color-gray-200)}.shortcuts-hint kbd{display:inline-block;padding:2px 6px;font-family:var(--font-mono, monospace);font-size:.75rem;background:var(--bg-secondary);border:1px solid var(--color-gray-300);border-radius:var(--radius-sm);margin:0 2px}.review-mode{display:flex;flex-direction:column;gap:var(--space-md);animation:fadeIn var(--transition-normal) ease-out}.review-badge{text-align:center;padding:var(--space-xs) var(--space-md);background:var(--color-primary);color:#fff;border-radius:var(--radius-full);font-size:.875rem;font-weight:500;align-self:center}.review-nav{display:flex;gap:var(--space-md);justify-content:center}.review-nav button{min-width:100px}.review-result{font-size:1.125rem;font-weight:600;text-align:center}.review-result.correct{color:var(--color-success)}.review-result.incorrect{color:var(--color-danger)}.review-your-answer{font-weight:400;font-size:.875rem}@media(max-width:768px){.quiz-card{padding:var(--space-xl);min-height:150px}.quiz-input{font-size:1.25rem}.quiz-buttons{flex-direction:column}.quiz-buttons button{width:100%}}.summary-header{text-align:center;margin-bottom:var(--space-xl)}.score-card{display:flex;flex-direction:column;align-items:center;gap:var(--space-lg);padding:var(--space-2xl);margin-bottom:var(--space-xl)}.score-circle{width:150px;height:150px;border-radius:50%;background:conic-gradient(var(--color-success) calc(var(--percentage) * 1%),var(--color-gray-200) calc(var(--percentage) * 1%));display:flex;align-items:center;justify-content:center;position:relative}.score-circle:before{content:"";position:absolute;width:120px;height:120px;background:var(--bg-card);border-radius:50%}.score-value{position:relative;z-index:1;font-size:2.5rem;font-weight:700;color:var(--text-primary)}.score-details{display:flex;gap:var(--space-md);font-size:1.125rem}.score-correct{color:var(--color-success);font-weight:500}.score-separator{color:var(--text-muted)}.score-total{color:var(--color-danger);font-weight:500}.score-hints{margin-top:var(--space-sm);font-size:.875rem}.hints-label{color:var(--text-muted)}.review-section{margin-bottom:var(--space-xl)}.review-list{display:flex;flex-direction:column;gap:var(--space-sm)}.review-item{display:flex;align-items:center;justify-content:space-between;gap:var(--space-md);padding:var(--space-md);background:var(--bg-secondary);border-radius:var(--radius-md);border-left:4px solid var(--color-danger)}.review-left{display:flex;flex-direction:row;align-items:center;gap:var(--space-md)}.review-hanzi{font-family:var(--font-sans);font-size:2rem;font-weight:500;min-width:100px}.review-english{font-size:.875rem;color:var(--text-muted);width:150px;min-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.review-answers{display:flex;flex-direction:column;align-items:flex-end;gap:var(--space-xs);font-size:.875rem}.review-yours{color:var(--color-danger)}.review-correct{color:var(--color-success)}.review-answers strong{font-weight:600}.celebration{display:flex;flex-direction:column;align-items:center;gap:var(--space-md);padding:var(--space-2xl);margin-bottom:var(--space-xl);text-align:center}.celebration-icon{font-size:4rem;animation:bounce 1s ease infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.summary-actions{display:flex;flex-direction:column;gap:var(--space-md)}@media(max-width:768px){.review-item{flex-direction:column;align-items:flex-start}.review-answers{align-items:flex-start}}.handwriting-page{display:flex;flex-direction:column;min-height:calc(100vh - 60px);padding:var(--space-md);max-width:600px;margin:0 auto}.handwriting-progress{display:flex;align-items:center;gap:var(--space-md);margin-bottom:var(--space-lg)}.handwriting-progress .progress-bar{flex:1;height:8px;background:var(--color-gray-200);border-radius:var(--radius-full);overflow:hidden}.handwriting-progress .progress-fill{height:100%;background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));transition:width var(--transition-normal)}.handwriting-progress .progress-text{font-size:.875rem;color:var(--text-secondary);white-space:nowrap}.finish-early-btn{padding:4px var(--space-sm);border:1.5px solid var(--color-gray-300);border-radius:var(--radius-full);background:var(--bg-card);color:var(--text-muted);font-size:.75rem;font-weight:600;cursor:pointer;white-space:nowrap;transition:all var(--transition-fast);flex-shrink:0}.finish-early-btn:hover{border-color:var(--color-danger, #ef4444);color:var(--color-danger, #ef4444);background:#ef44440f}.handwriting-card{text-align:center;padding:var(--space-xl);margin-bottom:var(--space-lg)}.handwriting-prompt{margin-bottom:var(--space-lg)}.handwriting-prompt .pinyin{font-size:1.5rem;color:var(--text-secondary);margin-bottom:var(--space-sm)}.handwriting-prompt .english{font-size:1.25rem;color:var(--text-primary)}.handwriting-canvas-container{display:flex;flex-direction:column;align-items:center;gap:var(--space-md)}.handwriting-canvas{cursor:crosshair;box-shadow:0 2px 8px #0000001a}.handwriting-controls{display:flex;gap:var(--space-sm)}.handwriting-feedback{margin-top:var(--space-lg);padding:var(--space-md);border-radius:var(--radius-md);text-align:center;font-weight:600}.handwriting-feedback.correct{background:var(--success-light);color:var(--success)}.handwriting-feedback.incorrect{background:var(--danger-light);color:var(--danger)}.handwriting-result-hanzi{font-size:4rem;margin:var(--space-md) 0}.handwriting-buttons{display:flex;justify-content:center;align-items:center;gap:var(--space-md);margin-top:var(--space-lg)}.handwriting-buttons .btn{flex:0 1 auto;min-width:140px}.handwriting-hint{text-align:center;margin-top:var(--space-md);font-size:.875rem}.result-feedback-box{display:flex;flex-direction:column;align-items:center;gap:var(--space-xs);padding:var(--space-md);border-radius:var(--radius-md);animation:fadeIn var(--transition-normal) ease-out;margin-bottom:var(--space-md)}.handwriting-review-mode{text-align:center}.handwriting-review-badge{display:inline-block;background:var(--primary);color:#fff;padding:var(--space-xs) var(--space-md);border-radius:var(--radius-full);font-size:.875rem;margin-bottom:var(--space-md)}.handwriting-review-card{padding:var(--space-xl)}.handwriting-review-card .hanzi{font-size:5rem;margin-bottom:var(--space-md)}.handwriting-review-result{font-size:1.125rem;font-weight:600;padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);display:inline-block}.handwriting-review-result.correct{background:var(--success-light);color:var(--success)}.handwriting-review-result.incorrect{background:var(--danger-light);color:var(--danger)}.shortcuts-hint{text-align:center;margin-top:var(--space-lg);font-size:.75rem}.shortcuts-hint kbd{background:var(--bg-secondary);border:1px solid var(--border);border-radius:4px;padding:2px 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#ef444400}}.voice-error{color:#ef4444;font-size:.875rem;text-align:center}.voice-result-content{display:flex;flex-direction:column;align-items:center;gap:var(--space-sm);text-align:center}.voice-result{display:flex;flex-direction:column;align-items:center;gap:.25rem}.result-feedback-box{display:flex;flex-direction:column;align-items:center;gap:var(--space-xs);padding:var(--space-md);border-radius:var(--radius-md);animation:fadeIn var(--transition-normal) ease-out;margin:var(--space-md) auto;width:100%;max-width:600px}.result-feedback-box.correct{background:#22c55e26;color:var(--color-success)}.result-feedback-box.incorrect{background:#ef444426;color:var(--color-danger)}.result-feedback-box .result-status{font-size:1.25rem;font-weight:600}.transcribed-text{font-size:1rem;color:var(--text-secondary)}.transcribed-text 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h3{margin:0;font-size:1rem;color:var(--text-secondary)}.card-list{display:flex;flex-direction:column;gap:.5rem;max-height:300px;overflow-y:auto}.card-item{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;background:var(--background);border-radius:8px;gap:1rem}.card-info{display:flex;align-items:center;gap:.75rem;flex:1;min-width:0}.card-info .hanzi{font-size:1.25rem;font-weight:600;flex-shrink:0}.card-info .pinyin{color:var(--text-secondary);font-size:.875rem}.card-info .english{color:var(--text-muted);font-size:.875rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.add-cards-section{padding-top:1.5rem;border-top:1px solid var(--border-color)}.add-cards-section h3{margin:0 0 1rem;font-size:1rem;color:var(--text-secondary)}.search-input{width:100%;padding:.75rem 1rem;border:1px solid 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.modal-body{padding:1.5rem;overflow-y:auto}.generate-deck-modal .form-group{margin-bottom:1.25rem}.generate-deck-modal label{display:block;margin-bottom:.5rem;font-weight:500;color:#666}.generate-deck-modal input,.generate-deck-modal textarea,.generate-deck-modal select{width:100%;padding:.75rem 1rem;border:1px solid #ddd;border-radius:8px;font-size:1rem;background:#fff;color:#333}.generate-deck-modal input:focus,.generate-deck-modal textarea:focus,.generate-deck-modal select:focus{outline:none;border-color:var(--primary)}.generate-deck-modal textarea{resize:vertical;min-height:80px}.generate-deck-modal select{cursor:pointer}.generate-deck-modal .form-actions{display:flex;gap:.75rem;justify-content:flex-end;margin-top:1.5rem}.success-message{text-align:center;padding:2rem 1rem}.success-icon{width:64px;height:64px;background:linear-gradient(135deg,#22c55e,#16a34a);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 1rem;font-size:2rem;color:#fff}.success-message h3{margin:0 0 .5rem;font-size:1.25rem}.success-message p{color:var(--text-secondary);margin-bottom:1.5rem}.error-message{background:#ef444426;color:#ef4444;padding:.75rem 1rem;border-radius:8px;margin-bottom:1rem;font-size:.875rem}.spinner-small{display:inline-block;width:16px;height:16px;border:2px solid transparent;border-top-color:currentColor;border-radius:50%;animation:spin .8s linear infinite;margin-right:.5rem;vertical-align:middle}.decks-list{display:grid;gap:var(--space-md)}.deck-item{display:flex;justify-content:space-between;align-items:center;gap:var(--space-md)}.deck-content{flex:1}.deck-name{font-size:1.125rem;margin-bottom:var(--space-xs)}.deck-description{color:var(--text-muted);font-size:.875rem;margin-bottom:var(--space-xs)}.deck-count{font-size:.75rem;color:var(--text-muted);background:var(--color-gray-100);padding:2px 8px;border-radius:var(--radius-full)}.deck-actions{display:flex;gap:var(--space-xs)}@media(max-width:768px){.deck-item{flex-direction:column;align-items:flex-start}.deck-actions{width:100%;justify-content:flex-end}}.admin-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-xl)}.admin-header h1{margin:0}.users-list{display:grid;gap:var(--space-md);max-width:700px}.user-card{display:flex;justify-content:space-between;align-items:center;padding:var(--space-lg)}.user-info{display:flex;gap:var(--space-md);align-items:center}.user-avatar{font-size:2rem;width:50px;height:50px;display:flex;align-items:center;justify-content:center;background:var(--color-gray-100);border-radius:var(--radius-full)}.user-details h3{margin:0 0 4px;font-size:1.1rem}.user-email{margin:0 0 6px;font-size:.85rem;color:var(--text-muted)}.role-badge{display:inline-block;padding:2px 10px;border-radius:var(--radius-full);font-size:.75rem;font-weight:600;text-transform:uppercase}.role-badge.admin{background:linear-gradient(135deg,#6366f126,#6366f10d);color:var(--color-primary)}.role-badge.user{background:linear-gradient(135deg,#22c55e26,#22c55e0d);color:#16a34a}.user-actions{display:flex;gap:var(--space-sm)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:var(--space-md)}.modal-card{width:100%;max-width:400px;padding:var(--space-xl)}.modal-card h2,.form-group{margin-bottom:var(--space-md)}.form-group label{display:block;margin-bottom:var(--space-xs);font-weight:500;font-size:.9rem}.form-group input,.form-group select{width:100%;padding:var(--space-sm) var(--space-md);border:1px solid var(--color-gray-300);border-radius:var(--radius-md);font-size:1rem}.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #6366f11a}.modal-actions{display:flex;gap:var(--space-sm);justify-content:flex-end;margin-top:var(--space-lg)}.error-text{color:var(--color-danger);font-size:.9rem;margin:var(--space-sm) 0}.success-text{color:#16a34a;font-size:.9rem;margin:var(--space-sm) 0}@media(max-width:640px){.user-card{flex-direction:column;align-items:flex-start;gap:var(--space-md)}.user-actions{width:100%}.user-actions button{flex:1}}.layout{min-height:100vh;display:flex;flex-direction:column}.navbar{background:var(--bg-card);border-bottom:1px solid var(--color-gray-200);height:64px;position:sticky;top:0;z-index:100}.navbar-content{display:flex;align-items:center;justify-content:space-between;height:100%}.navbar-brand{display:flex;align-items:center;gap:var(--space-sm);font-weight:700;color:var(--text-primary)}.brand-hanzi{font-family:var(--font-sans);font-size:1.5rem;color:var(--color-primary)}.brand-text{font-size:1.125rem}.navbar-links{display:flex;gap:var(--space-md)}.nav-link{padding:var(--space-sm) var(--space-md);color:var(--text-secondary);font-weight:500;border-radius:var(--radius-md);transition:all var(--transition-fast)}.nav-link:hover,.nav-link.active{color:var(--color-primary);background:#6366f11a}.navbar-user{display:flex;align-items:center;gap:var(--space-md)}.user-name{color:var(--text-secondary);font-size:.875rem}.main-content{flex:1;padding-bottom:80px}@media(min-width:769px){.main-content{padding-bottom:0}}.mobile-nav{position:fixed;bottom:0;left:0;right:0;background:var(--bg-card);border-top:1px solid var(--color-gray-200);display:flex;justify-content:space-around;padding:var(--space-sm) 0;z-index:100}.mobile-nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;padding:var(--space-xs) var(--space-md);color:var(--text-muted);font-size:.75rem;text-decoration:none;transition:color var(--transition-fast)}.mobile-nav-item.active{color:var(--color-primary)}.mobile-nav-icon{font-size:1.25rem}:root{--color-primary: #6366f1;--color-primary-dark: #4f46e5;--color-primary-light: #818cf8;--color-secondary: #0ea5e9;--color-success: #22c55e;--color-warning: #f59e0b;--color-danger: #ef4444;--color-gray-50: #f9fafb;--color-gray-100: #f3f4f6;--color-gray-200: #e5e7eb;--color-gray-300: #d1d5db;--color-gray-400: #9ca3af;--color-gray-500: #6b7280;--color-gray-600: #4b5563;--color-gray-700: #374151;--color-gray-800: #1f2937;--color-gray-900: #111827;--bg-primary: #ffffff;--bg-secondary: var(--color-gray-50);--bg-card: #ffffff;--text-primary: var(--color-gray-900);--text-secondary: var(--color-gray-600);--text-muted: var(--color-gray-400);--font-sans: "Noto Sans TC", "Noto Sans", system-ui, -apple-system, sans-serif;--font-serif: "Noto Serif TC", Georgia, serif;--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 3rem;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--transition-fast: .15s ease;--transition-normal: .2s ease;--transition-slow: .3s ease}@media(prefers-color-scheme:dark){:root{--bg-primary: var(--color-gray-900);--bg-secondary: var(--color-gray-800);--bg-card: var(--color-gray-800);--text-primary: var(--color-gray-100);--text-secondary: var(--color-gray-400);--text-muted: var(--color-gray-500)}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background-color:var(--bg-secondary);color:var(--text-primary);line-height:1.5;min-height:100vh}h1,h2,h3,h4,h5,h6{line-height:1.2;font-weight:700}h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.25rem}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-dark)}button{font-family:inherit;cursor:pointer;border:none;background:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-lg);font-size:1rem;font-weight:500;border-radius:var(--radius-md);transition:all var(--transition-fast);min-height:44px;min-width:44px}.btn-primary{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;box-shadow:var(--shadow-md)}.btn-primary:hover{transform:translateY(-1px);box-shadow:var(--shadow-lg)}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--color-gray-300)}.btn-secondary:hover{background:var(--color-gray-100)}.btn-success{background:linear-gradient(135deg,var(--color-success),#16a34a);color:#fff}.btn-warning{background:linear-gradient(135deg,var(--color-warning),#d97706);color:#fff}.btn-danger{background:linear-gradient(135deg,var(--color-danger),#dc2626);color:#fff}.btn-lg{padding:var(--space-md) var(--space-xl);font-size:1.125rem}.btn-sm{padding:var(--space-xs) var(--space-md);font-size:.875rem;min-height:36px}.card{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:var(--space-lg)}input,select,textarea{font-family:inherit;font-size:1rem;padding:var(--space-sm) var(--space-md);border:1px solid var(--color-gray-300);border-radius:var(--radius-md);background:var(--bg-card);color:var(--text-primary);width:100%;transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #6366f133}label{display:block;font-weight:500;margin-bottom:var(--space-xs);color:var(--text-secondary)}.container{max-width:1200px;margin:0 auto;padding:0 var(--space-lg)}.page{padding:var(--space-lg) var(--space-md);min-height:calc(100vh - 64px)}@media(max-width:768px){.container{padding:0 var(--space-md)}}.hanzi{font-family:var(--font-sans);font-size:clamp(72px,16vh,160px);line-height:1.1;text-align:center}.hanzi-lg{font-size:clamp(96px,14vh,220px)}.pinyin{font-family:var(--font-sans);font-size:1.5rem;line-height:1.4;color:var(--text-secondary);text-align:center}.english{font-family:var(--font-sans);font-size:1.25rem;color:var(--text-secondary);text-align:center}.text-center{text-align:center}.text-muted{color:var(--text-muted)}.mb-sm{margin-bottom:var(--space-sm)}.mb-md{margin-bottom:var(--space-md)}.mb-lg{margin-bottom:var(--space-lg)}.mt-md{margin-top:var(--space-md)}.mt-lg{margin-top:var(--space-lg)}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-sm{gap:var(--space-sm)}.gap-md{gap:var(--space-md)}.gap-lg{gap:var(--space-lg)}.w-full{width:100%}.hidden{display:none}@media(max-width:768px){.hanzi{font-size:clamp(48px,14vh,120px)}.hide-mobile{display:none}}@media(min-width:769px){.hide-desktop{display:none}}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fadeIn{animation:fadeIn var(--transition-normal) ease-out}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.animate-pulse{animation:pulse 2s cubic-bezier(.4,0,.6,1) infinite}.spinner{width:24px;height:24px;border:3px solid var(--color-gray-200);border-top-color:var(--color-primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}