:root{--font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;--bg-primary: #0b0f19;--bg-secondary: #111827;--bg-surface: #1a2234;--bg-surface-hover: #222d44;--bg-surface-active: #2a3754;--bg-elevated: #242f48;--border-subtle: rgba(255, 255, 255, .08);--border-medium: rgba(255, 255, 255, .16);--border-strong: rgba(255, 255, 255, .28);--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--text-inverse: #0b0f19;--accent-primary: #6366f1;--accent-primary-hover: #4f46e5;--accent-primary-subtle: rgba(99, 102, 241, .15);--accent-primary-border: rgba(99, 102, 241, .35);--accent-success: #10b981;--accent-success-hover: #059669;--accent-success-subtle: rgba(16, 185, 129, .15);--accent-warning: #f59e0b;--accent-warning-subtle: rgba(245, 158, 11, .15);--accent-danger: #ef4444;--accent-danger-hover: #dc2626;--accent-danger-subtle: rgba(239, 68, 68, .15);--accent-cyan: #06b6d4;--accent-cyan-subtle: rgba(6, 182, 212, .15);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 22px;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .25);--shadow-md: 0 4px 12px -1px rgba(0, 0, 0, .35), 0 2px 4px -1px rgba(0, 0, 0, .25);--shadow-lg: 0 12px 30px -4px rgba(0, 0, 0, .45), 0 4px 8px -2px rgba(0, 0, 0, .3);--shadow-card: 0 10px 25px -5px rgba(0, 0, 0, .5), 0 8px 10px -6px rgba(0, 0, 0, .3);--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .4s cubic-bezier(.16, 1, .3, 1)}[data-theme=light]{--bg-primary: #f8fafc;--bg-secondary: #f1f5f9;--bg-surface: #ffffff;--bg-surface-hover: #f8fafc;--bg-surface-active: #f1f5f9;--bg-elevated: #ffffff;--border-subtle: rgba(0, 0, 0, .07);--border-medium: rgba(0, 0, 0, .12);--border-strong: rgba(0, 0, 0, .2);--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--text-inverse: #ffffff;--accent-primary: #4f46e5;--accent-primary-hover: #4338ca;--accent-primary-subtle: rgba(79, 70, 229, .1);--accent-primary-border: rgba(79, 70, 229, .25);--accent-success: #059669;--accent-success-hover: #047857;--accent-success-subtle: rgba(5, 150, 105, .1);--shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, .06);--shadow-md: 0 4px 12px -1px rgba(0, 0, 0, .08), 0 2px 4px -1px rgba(0, 0, 0, .04);--shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, .12), 0 4px 6px -2px rgba(0, 0, 0, .04);--shadow-card: 0 10px 20px -3px rgba(0, 0, 0, .08), 0 4px 6px -2px rgba(0, 0, 0, .04)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{color:var(--text-primary);font-weight:700;line-height:1.25;letter-spacing:-.02em}h1{font-size:2.25rem}h2{font-size:1.75rem}h3{font-size:1.35rem}h4{font-size:1.1rem}p{color:var(--text-secondary);font-size:.95rem}a{color:var(--accent-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--accent-primary-hover)}button,input,textarea,select{font-family:inherit;font-size:inherit}.app-container{max-width:1240px;margin:0 auto;padding:0 1.5rem;width:100%;flex:1;display:flex;flex-direction:column}.app-header{border-bottom:1px solid var(--border-subtle);background:var(--bg-secondary);position:sticky;top:0;z-index:50;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}.brand{display:flex;align-items:center;gap:.75rem;font-weight:800;font-size:1.25rem;color:var(--text-primary);text-decoration:none}.brand-icon{width:38px;height:38px;background:linear-gradient(135deg,var(--accent-primary),#8b5cf6);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.2rem;box-shadow:0 4px 10px #6366f159}.nav-tabs{display:flex;align-items:center;gap:.5rem;background:var(--bg-surface);padding:.3rem .4rem;border-radius:var(--radius-lg);border:1px solid var(--border-subtle)}.nav-tab-btn{background:transparent;border:none;color:var(--text-secondary);font-weight:600;font-size:.875rem;padding:.5rem 1rem;border-radius:var(--radius-md);cursor:pointer;display:flex;align-items:center;gap:.5rem;transition:all var(--transition-fast)}.nav-tab-btn:hover{color:var(--text-primary);background:var(--bg-surface-hover)}.nav-tab-btn.active{background:var(--accent-primary);color:#fff;box-shadow:0 2px 8px #6366f159}.nav-tab-btn .badge-count{background:#fff3;color:#fff;font-size:.75rem;padding:.1rem .45rem;border-radius:var(--radius-full)}.nav-actions{display:flex;align-items:center;gap:.75rem}.icon-btn{background:var(--bg-surface);border:1px solid var(--border-subtle);color:var(--text-secondary);width:38px;height:38px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition-fast)}.icon-btn:hover{background:var(--bg-surface-hover);color:var(--text-primary);border-color:var(--border-medium)}.view-section{display:none;padding:2rem 0;animation:fadeIn .3s ease}.view-section.active{display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-weight:600;font-size:.925rem;padding:.65rem 1.25rem;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap}.btn-primary{background:var(--accent-primary);color:#fff;box-shadow:0 4px 12px #6366f140}.btn-primary:hover:not(:disabled){background:var(--accent-primary-hover);box-shadow:0 6px 16px #6366f159;transform:translateY(-1px)}.btn-secondary{background:var(--bg-surface);color:var(--text-primary);border-color:var(--border-medium)}.btn-secondary:hover:not(:disabled){background:var(--bg-surface-hover);border-color:var(--border-strong)}.btn-success{background:var(--accent-success);color:#fff}.btn-success:hover:not(:disabled){background:var(--accent-success-hover)}.btn-danger{background:var(--accent-danger-subtle);color:var(--accent-danger);border-color:#ef44444d}.btn-danger:hover:not(:disabled){background:var(--accent-danger);color:#fff}.btn-sm{padding:.4rem .8rem;font-size:.825rem;border-radius:var(--radius-sm)}.btn-lg{padding:.85rem 1.75rem;font-size:1.05rem;border-radius:var(--radius-lg)}.btn:disabled{opacity:.55;cursor:not-allowed;transform:none!important}.badge{display:inline-flex;align-items:center;gap:.35rem;font-size:.75rem;font-weight:600;padding:.25rem .6rem;border-radius:var(--radius-full);letter-spacing:.02em}.badge-primary{background:var(--accent-primary-subtle);color:var(--accent-primary);border:1px solid var(--accent-primary-border)}.badge-success{background:var(--accent-success-subtle);color:var(--accent-success);border:1px solid rgba(16,185,129,.3)}.badge-warning{background:var(--accent-warning-subtle);color:var(--accent-warning);border:1px solid rgba(245,158,11,.3)}.badge-info{background:var(--accent-cyan-subtle);color:var(--accent-cyan);border:1px solid rgba(6,182,212,.3)}.badge-muted{background:#ffffff0f;color:var(--text-secondary);border:1px solid var(--border-subtle)}.card-box{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-sm)}.form-group{margin-bottom:1.25rem}.form-label{display:block;font-size:.875rem;font-weight:600;margin-bottom:.5rem;color:var(--text-primary)}.form-input,.form-textarea,.form-select{width:100%;background:var(--bg-secondary);border:1px solid var(--border-medium);border-radius:var(--radius-md);color:var(--text-primary);padding:.7rem 1rem;font-size:.95rem;transition:all var(--transition-fast);outline:none}.form-input:focus,.form-textarea:focus,.form-select:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-primary-subtle)}.form-textarea{min-height:180px;resize:vertical;line-height:1.55;font-family:var(--font-sans)}.dropzone{border:2px dashed var(--border-medium);background:var(--bg-secondary);border-radius:var(--radius-lg);padding:2.25rem 1.5rem;text-align:center;cursor:pointer;transition:all var(--transition-normal);display:flex;flex-direction:column;align-items:center;gap:.75rem}.dropzone:hover,.dropzone.dragover{border-color:var(--accent-primary);background:var(--accent-primary-subtle)}.dropzone-icon{width:52px;height:52px;border-radius:var(--radius-full);background:var(--bg-surface);display:flex;align-items:center;justify-content:center;font-size:1.75rem;color:var(--accent-primary);border:1px solid var(--border-subtle)}.options-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1rem}.presets-bar{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;margin-bottom:1rem}.preset-chip{background:var(--bg-surface);border:1px solid var(--border-subtle);color:var(--text-secondary);font-size:.8rem;font-weight:500;padding:.35rem .75rem;border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-fast)}.preset-chip:hover{background:var(--bg-surface-hover);color:var(--text-primary);border-color:var(--border-medium)}.toast-container{position:fixed;bottom:1.5rem;right:1.5rem;z-index:1000;display:flex;flex-direction:column;gap:.75rem;pointer-events:none}.toast{background:var(--bg-elevated);border:1px solid var(--border-strong);color:var(--text-primary);padding:.85rem 1.25rem;border-radius:var(--radius-md);box-shadow:var(--shadow-lg);display:flex;align-items:center;gap:.75rem;font-size:.9rem;min-width:280px;max-width:420px;animation:slideInUp .3s cubic-bezier(.16,1,.3,1);pointer-events:auto}.toast.success{border-color:var(--accent-success)}.toast.error{border-color:var(--accent-danger)}.toast.info{border-color:var(--accent-primary)}@keyframes slideInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;z-index:200;padding:1.5rem;opacity:0;pointer-events:none;transition:opacity var(--transition-normal)}.modal-overlay.open{opacity:1;pointer-events:auto}.modal-content{background:var(--bg-surface);border:1px solid var(--border-medium);border-radius:var(--radius-lg);width:100%;max-width:620px;max-height:90vh;overflow-y:auto;padding:1.75rem;box-shadow:var(--shadow-lg);transform:scale(.95);transition:transform var(--transition-normal)}.modal-overlay.open .modal-content{transform:scale(1)}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.25rem;padding-bottom:.75rem;border-bottom:1px solid var(--border-subtle)}@media(max-width:768px){.header-inner{flex-direction:column;height:auto;padding:.75rem 0;gap:.75rem}.nav-tabs{width:100%;overflow-x:auto}.nav-tab-btn{padding:.4rem .75rem;font-size:.8rem}.options-grid{grid-template-columns:1fr}}.hero-section{text-align:center;padding:3.5rem 1rem 2.5rem;max-width:860px;margin:0 auto}.hero-badge{display:inline-flex;align-items:center;gap:.5rem;padding:.35rem .9rem;border-radius:var(--radius-full);background:var(--accent-primary-subtle);border:1px solid var(--accent-primary-border);color:#a5b4fc;font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;margin-bottom:1.25rem}.hero-title{font-size:2.75rem;font-weight:800;line-height:1.15;letter-spacing:-.03em;background:linear-gradient(135deg,#fff 30%,#94a3b8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:1rem}[data-theme=light] .hero-title{background:linear-gradient(135deg,#0f172a 30%,#475569);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.hero-subtitle{font-size:1.125rem;color:var(--text-secondary);line-height:1.6;margin-bottom:2rem}.feature-grid-4{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.25rem;margin:2.5rem 0}.feature-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:1.5rem;transition:all var(--transition-normal)}.feature-card:hover{border-color:var(--accent-primary-border);transform:translateY(-2px);box-shadow:var(--shadow-md)}.feature-icon{width:42px;height:42px;border-radius:var(--radius-md);background:var(--accent-primary-subtle);color:var(--accent-primary);display:flex;align-items:center;justify-content:center;font-size:1.25rem;margin-bottom:1rem}.feature-card h3{font-size:1rem;font-weight:700;color:var(--text-primary);margin-bottom:.4rem}.feature-card p{font-size:.85rem;color:var(--text-secondary);line-height:1.5}.pricing-section{padding:3rem 0;max-width:1050px;margin:0 auto}.pricing-header{text-align:center;margin-bottom:2.5rem}.pricing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem;align-items:stretch}.pricing-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);padding:2rem;display:flex;flex-direction:column;justify-content:space-between;position:relative;transition:all var(--transition-normal)}.pricing-card:hover{border-color:var(--border-medium)}.pricing-card.featured{border:2px solid var(--accent-primary);box-shadow:0 0 30px #6366f126;background:linear-gradient(180deg,rgba(99,102,241,.06) 0%,var(--bg-surface) 100%)}.popular-badge{position:absolute;top:-12px;left:50%;transform:translate(-50%);background:var(--accent-primary);color:#fff;font-size:.7rem;font-weight:800;text-transform:uppercase;padding:.25rem .8rem;border-radius:var(--radius-full);letter-spacing:.05em}.pricing-price{font-size:2.5rem;font-weight:800;color:var(--text-primary);margin:1rem 0 .5rem}.pricing-period{font-size:.85rem;color:var(--text-muted);font-weight:500}.pricing-features{list-style:none;margin:1.5rem 0;padding-top:1.25rem;border-top:1px solid var(--border-subtle)}.pricing-features li{font-size:.85rem;color:var(--text-secondary);margin-bottom:.75rem;display:flex;align-items:center;gap:.6rem}.pricing-features li:before{content:"✓";color:var(--accent-success);font-weight:800;font-size:.9rem}.pay-methods-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem;margin-bottom:1.25rem}.pay-tab-btn{background:var(--bg-primary);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:.75rem .5rem;color:var(--text-secondary);font-size:.75rem;font-weight:600;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:.35rem;transition:all var(--transition-fast)}.pay-tab-btn.active,.pay-tab-btn:hover{background:var(--accent-primary-subtle);border-color:var(--accent-primary);color:var(--text-primary)}.admin-metrics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:1.5rem}.admin-metric-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:1.25rem}.admin-metric-val{font-size:1.75rem;font-weight:800;color:var(--text-primary);margin:.35rem 0 .2rem}.admin-table{width:100%;border-collapse:collapse;font-size:.85rem;text-align:left}.admin-table th{background:var(--bg-primary);color:var(--text-muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;padding:.75rem 1rem;border-bottom:1px solid var(--border-subtle)}.admin-table td{padding:.85rem 1rem;border-bottom:1px solid var(--border-subtle);color:var(--text-secondary)}.admin-table tr:hover td{background:var(--bg-surface-hover);color:var(--text-primary)}.deck-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.5rem;margin-top:1.5rem}.deck-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:1.5rem;transition:all var(--transition-normal);display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}.deck-card:hover{transform:translateY(-3px);border-color:var(--border-strong);box-shadow:var(--shadow-card)}.deck-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:.75rem}.deck-title{font-size:1.2rem;font-weight:700;color:var(--text-primary);margin-bottom:.35rem}.deck-description{font-size:.875rem;color:var(--text-secondary);line-height:1.45;margin-bottom:1rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.deck-meta{display:flex;align-items:center;gap:.75rem;font-size:.8rem;color:var(--text-muted);margin-bottom:1.25rem}.deck-tags{display:flex;flex-wrap:wrap;gap:.35rem;margin-bottom:1.25rem}.deck-actions{display:flex;align-items:center;gap:.5rem;border-top:1px solid var(--border-subtle);padding-top:1rem;margin-top:auto}.cards-preview-container{margin-top:2rem}.cards-preview-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem;flex-wrap:wrap;gap:1rem}.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:1.25rem}.card-item{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:1.25rem;display:flex;flex-direction:column;justify-content:space-between;min-height:180px;position:relative;transition:all var(--transition-fast)}.card-item:hover{border-color:var(--border-medium);box-shadow:var(--shadow-sm)}.card-item-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem}.card-item-body{flex:1}.card-item-q{font-size:.95rem;font-weight:600;color:var(--text-primary);margin-bottom:.5rem}.card-item-a{font-size:.875rem;color:var(--text-secondary);border-left:2px solid var(--accent-primary);padding-left:.6rem;margin-top:.5rem;background:var(--bg-secondary);padding:.5rem .6rem;border-radius:0 var(--radius-sm) var(--radius-sm) 0}.card-item-footer{display:flex;align-items:center;justify-content:space-between;margin-top:.75rem;padding-top:.6rem;border-top:1px solid var(--border-subtle);font-size:.75rem;color:var(--text-muted)}.flashcard-stage{perspective:1400px;width:100%;max-width:680px;margin:1.5rem auto;min-height:380px;-webkit-user-select:none;user-select:none}.flashcard-3d{width:100%;min-height:380px;position:relative;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.175,.885,.32,1.275);cursor:pointer}.flashcard-3d.flipped{transform:rotateY(180deg)}.card-face{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;min-height:380px;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--bg-surface);border:1px solid var(--border-medium);border-radius:var(--radius-xl);padding:2.25rem;display:flex;flex-direction:column;justify-content:space-between;box-shadow:var(--shadow-card);overflow-y:auto}.card-face-back{transform:rotateY(180deg);background:linear-gradient(170deg,var(--bg-surface) 0%,var(--bg-elevated) 100%);border-color:var(--accent-primary-border)}.card-face-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem}.card-face-body{flex:1;display:flex;flex-direction:column;justify-content:center;text-align:center;padding:1rem 0}.card-face-text{font-size:1.45rem;font-weight:600;line-height:1.45;color:var(--text-primary);letter-spacing:-.01em}.card-face-back .card-face-text{color:#a5b4fc}[data-theme=light] .card-face-back .card-face-text{color:#4338ca}.card-face-explanation{margin-top:1.25rem;font-size:.925rem;color:var(--text-secondary);background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:.85rem 1rem;text-align:left;line-height:1.5}.card-face-footer{display:flex;align-items:center;justify-content:space-between;margin-top:1.5rem;padding-top:1rem;border-top:1px solid var(--border-subtle);font-size:.85rem;color:var(--text-muted)}.hint-pill{display:inline-flex;align-items:center;gap:.35rem;font-size:.775rem;color:var(--text-muted)}.key-badge{background:var(--bg-secondary);border:1px solid var(--border-strong);color:var(--text-primary);font-family:var(--font-mono);font-size:.75rem;padding:.15rem .45rem;border-radius:var(--radius-sm);box-shadow:0 1px 2px #0003}.study-top-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;flex-wrap:wrap;gap:1rem}.study-progress-container{flex:1;max-width:400px}.progress-track{width:100%;height:8px;background:var(--bg-secondary);border-radius:var(--radius-full);overflow:hidden;border:1px solid var(--border-subtle)}.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--accent-primary),var(--accent-success));border-radius:var(--radius-full);transition:width .3s ease}.progress-stats-text{display:flex;justify-content:space-between;font-size:.8rem;color:var(--text-secondary);margin-top:.35rem}.confidence-ratings-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:.75rem;width:100%;max-width:680px;margin:1.5rem auto 0}.rating-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:.85rem .5rem;border-radius:var(--radius-md);border:1px solid var(--border-medium);background:var(--bg-surface);color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast);gap:.25rem}.rating-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}.rating-btn.again:hover{background:var(--accent-danger-subtle);border-color:var(--accent-danger);color:var(--accent-danger)}.rating-btn.hard:hover{background:var(--accent-warning-subtle);border-color:var(--accent-warning);color:var(--accent-warning)}.rating-btn.good:hover{background:var(--accent-primary-subtle);border-color:var(--accent-primary);color:var(--accent-primary)}.rating-btn.easy:hover{background:var(--accent-success-subtle);border-color:var(--accent-success);color:var(--accent-success)}.rating-title{font-size:.95rem;font-weight:700}.rating-interval{font-size:.75rem;color:var(--text-muted)}.quiz-container{max-width:720px;margin:0 auto}.quiz-card{background:var(--bg-surface);border:1px solid var(--border-medium);border-radius:var(--radius-xl);padding:2rem;box-shadow:var(--shadow-card)}.quiz-question-text{font-size:1.35rem;font-weight:700;color:var(--text-primary);line-height:1.45;margin:1rem 0 1.75rem}.quiz-options-list{display:flex;flex-direction:column;gap:.85rem}.quiz-option-btn{width:100%;text-align:left;padding:1rem 1.25rem;background:var(--bg-secondary);border:1px solid var(--border-medium);border-radius:var(--radius-md);color:var(--text-primary);font-size:1rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast);display:flex;align-items:center;gap:.85rem}.quiz-option-btn:hover:not(:disabled){border-color:var(--accent-primary);background:var(--accent-primary-subtle)}.quiz-option-btn.selected-correct{background:var(--accent-success-subtle)!important;border-color:var(--accent-success)!important;color:var(--accent-success)!important}.quiz-option-btn.selected-incorrect{background:var(--accent-danger-subtle)!important;border-color:var(--accent-danger)!important;color:var(--accent-danger)!important}.quiz-option-btn.reveal-correct{border-color:var(--accent-success)!important;box-shadow:0 0 0 2px var(--accent-success-subtle)}.quiz-explanation-box{margin-top:1.5rem;padding:1.25rem;border-radius:var(--radius-md);background:var(--bg-secondary);border:1px solid var(--border-subtle);animation:fadeIn .3s ease}.match-game-container{max-width:860px;margin:0 auto}.match-stats-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;padding:.85rem 1.25rem;background:var(--bg-surface);border-radius:var(--radius-md);border:1px solid var(--border-subtle)}.match-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}.match-tile{background:var(--bg-surface);border:1px solid var(--border-medium);border-radius:var(--radius-lg);padding:1.25rem 1rem;min-height:120px;display:flex;align-items:center;justify-content:center;text-align:center;font-size:.9rem;font-weight:600;cursor:pointer;transition:all var(--transition-fast);box-shadow:var(--shadow-sm);color:var(--text-primary);-webkit-user-select:none;user-select:none}.match-tile:hover:not(.matched):not(.selected){border-color:var(--accent-primary);transform:translateY(-2px)}.match-tile.selected{background:var(--accent-primary-subtle);border-color:var(--accent-primary);box-shadow:0 0 0 2px var(--accent-primary)}.match-tile.matched{background:var(--accent-success-subtle);border-color:var(--accent-success);color:var(--accent-success);opacity:.45;cursor:default;pointer-events:none}.match-tile.mismatch{background:var(--accent-danger-subtle);border-color:var(--accent-danger);animation:shake .4s ease}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}75%{transform:translate(6px)}}.ai-tutor-drawer{background:var(--bg-secondary);border:1px solid var(--border-medium);border-radius:var(--radius-lg);padding:1.5rem;margin-top:1.5rem}.ai-tutor-content{font-size:.95rem;line-height:1.6;color:var(--text-secondary)}.ai-tutor-content strong{color:var(--text-primary)}@media(max-width:640px){.confidence-ratings-bar,.match-grid{grid-template-columns:repeat(2,1fr)}.flashcard-stage{min-height:320px}.card-face{min-height:320px;padding:1.5rem}.card-face-text{font-size:1.2rem}}@media print{body{background:#fff!important;color:#000!important;font-size:11pt}.app-header,.nav-tabs,.nav-actions,.btn,.confidence-ratings-bar,.presets-bar,.toast-container,.modal-overlay,.dropzone,.no-print{display:none!important}.app-container{max-width:100%!important;padding:0!important;margin:0!important}.view-section{display:block!important;padding:0!important}.printable-cards-grid{display:grid!important;grid-template-columns:repeat(2,1fr)!important;gap:12pt!important;page-break-inside:auto}.printable-card-item{border:1.5pt dashed #444444!important;border-radius:6pt!important;padding:14pt!important;min-height:180pt!important;page-break-inside:avoid!important;display:flex!important;flex-direction:column!important;justify-content:space-between!important;background:#fff!important;color:#000!important}.printable-card-q{font-weight:700!important;font-size:12pt!important;margin-bottom:8pt!important;color:#000!important}.printable-card-divider{border-top:1pt dotted #888888!important;margin:8pt 0!important}.printable-card-a{font-size:11pt!important;color:#222!important}.study-guide-print{padding:20pt!important}.study-guide-print h1{font-size:18pt!important;border-bottom:2pt solid #000!important;padding-bottom:6pt!important;margin-bottom:12pt!important;color:#000!important}.study-guide-table{width:100%!important;border-collapse:collapse!important;margin-top:12pt!important}.study-guide-table th,.study-guide-table td{border:1pt solid #333333!important;padding:8pt!important;text-align:left!important;font-size:10pt!important}.study-guide-table th{background-color:#eee!important;font-weight:700!important}}