@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap");:root{--bg-primary:#f0f2ff;--bg-secondary:#ffffff;--bg-card:#ffffff;--bg-hover:#e8ebff;--bg-input:#f5f6fa;--text-primary:#0d0f1a;--text-secondary:#5a5f7a;--text-muted:#9ca3af;--text-inverse:#ffffff;--accent-primary:#6366f1;--accent-secondary:#8b5cf6;--accent-gradient:linear-gradient(135deg,#6366f1,#8b5cf6);--accent-glow:rgba(99,102,241,0.12);--border:#e2e5f5;--border-focus:#6366f1;--success:#10b981;--success-bg:#d1fae5;--error:#ef4444;--error-bg:#fee2e2;--warning:#f59e0b;--warning-bg:#fef3c7;--shadow-sm:0 1px 3px rgba(99,102,241,0.06),0 1px 2px rgba(0,0,0,0.04);--shadow-md:0 4px 16px rgba(99,102,241,0.1),0 2px 6px rgba(0,0,0,0.04);--shadow-lg:0 10px 40px rgba(99,102,241,0.12),0 4px 12px rgba(0,0,0,0.05);--shadow-accent:0 4px 20px rgba(99,102,241,0.3);--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--transition:all 0.2s ease;--transition-slow:all 0.35s ease;--navbar-height:64px}[data-theme=dark]{--bg-primary:#0a0b14;--bg-secondary:#111827;--bg-card:#161b2e;--bg-hover:#1e2540;--bg-input:#1a2035;--text-primary:#f0f2ff;--text-secondary:#9ca3c9;--text-muted:#6b7280;--text-inverse:#0d0f1a;--accent-primary:#818cf8;--accent-secondary:#a78bfa;--accent-gradient:linear-gradient(135deg,#818cf8,#a78bfa);--accent-glow:rgba(129,140,248,0.2);--border:#1e2843;--border-focus:#818cf8;--success-bg:rgba(16,185,129,0.15);--error-bg:rgba(239,68,68,0.15);--warning-bg:rgba(245,158,11,0.15);--shadow-sm:0 1px 3px rgba(0,0,0,0.3),0 1px 2px rgba(0,0,0,0.2);--shadow-md:0 4px 16px rgba(0,0,0,0.4),0 2px 6px rgba(0,0,0,0.2);--shadow-lg:0 10px 40px rgba(0,0,0,0.5),0 4px 12px rgba(0,0,0,0.3);--shadow-accent:0 4px 20px rgba(129,140,248,0.3)}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;transition:background-color .3s ease,color .3s ease;min-height:100vh;background-image:radial-gradient(ellipse at 20% 50%,rgba(99,102,241,.05) 0,transparent 60%),radial-gradient(ellipse at 80% 10%,rgba(139,92,246,.05) 0,transparent 50%)}[data-theme=dark] body{background-image:radial-gradient(ellipse at 20% 50%,rgba(129,140,248,.06) 0,transparent 60%),radial-gradient(ellipse at 80% 10%,rgba(167,139,250,.06) 0,transparent 50%)}h1,h2,h3,h4,h5,h6{font-family:Space Grotesk,sans-serif;font-weight:700;line-height:1.3;color:var(--text-primary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border-radius:var(--radius-md);font-family:Inter,sans-serif;font-size:14px;font-weight:600;cursor:pointer;border:none;transition:var(--transition);text-decoration:none;white-space:nowrap;position:relative;overflow:hidden}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--accent-gradient);color:#fff;box-shadow:var(--shadow-accent)}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 24px rgba(99,102,241,.35)}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border:1.5px solid var(--border)}.btn-secondary:hover:not(:disabled){background:var(--bg-hover);border-color:var(--accent-primary);color:var(--accent-primary)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover:not(:disabled){background:var(--bg-hover);color:var(--text-primary)}.btn-danger{background:var(--error);color:#fff}.btn-sm{padding:6px 14px;font-size:13px;border-radius:var(--radius-sm)}.btn-lg{padding:14px 28px;font-size:16px;border-radius:var(--radius-lg)}.btn-block{width:100%}.form-group{display:flex;flex-direction:column;gap:6px}.form-label{font-size:13px;font-weight:600;color:var(--text-secondary);letter-spacing:.02em;text-transform:uppercase}.form-input{width:100%;padding:12px 16px;background:var(--bg-input);border:1.5px solid var(--border);border-radius:var(--radius-md);font-size:15px;font-family:Inter,sans-serif;color:var(--text-primary);transition:var(--transition);outline:none}.form-input:focus{border-color:var(--border-focus);background:var(--bg-secondary);box-shadow:0 0 0 3px var(--accent-glow)}.form-input::placeholder{color:var(--text-muted)}.form-select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%236b7280'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;background-size:20px;padding-right:40px}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:var(--transition)}.card-hover:hover{box-shadow:var(--shadow-md);border-color:var(--accent-primary);transform:translateY(-2px)}.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:var(--radius-full);font-size:12px;font-weight:600}.badge-primary{background:var(--accent-glow);color:var(--accent-primary)}.badge-success{background:var(--success-bg);color:var(--success)}.badge-error{background:var(--error-bg);color:var(--error)}.badge-warning{background:var(--warning-bg);color:var(--warning)}.container{max-width:1100px;margin:0 auto;padding:0 20px}.page-wrapper{padding-top:calc(var(--navbar-height) + 32px);min-height:100vh}.navbar{position:fixed;top:0;left:0;right:0;height:var(--navbar-height);background:rgba(255,255,255,.85);border-bottom:1px solid var(--border);z-index:100;backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%)}[data-theme=dark] .navbar{background:rgba(17,24,39,.85)}.navbar-inner{max-width:1100px;margin:0 auto;padding:0 20px;height:100%;gap:16px}.navbar-inner,.navbar-logo{display:flex;align-items:center}.navbar-logo{gap:10px;text-decoration:none;font-family:Space Grotesk,sans-serif;font-weight:700;font-size:20px;color:var(--text-primary);flex-shrink:0}.navbar-logo-icon{width:36px;height:36px;background:var(--accent-gradient);border-radius:var(--radius-sm);justify-content:center;font-size:18px}.navbar-logo-icon,.navbar-nav{display:flex;align-items:center}.navbar-nav{gap:4px;margin-left:auto}.nav-link{display:flex;align-items:center;gap:6px;padding:8px 14px;border-radius:var(--radius-md);font-size:14px;font-weight:500;color:var(--text-secondary);text-decoration:none;transition:var(--transition)}.nav-link.active,.nav-link:hover{color:var(--accent-primary);background:var(--bg-hover)}.navbar-actions{gap:8px;margin-left:8px}.navbar-actions,.theme-toggle{display:flex;align-items:center}.theme-toggle{width:40px;height:40px;border-radius:var(--radius-md);border:1.5px solid var(--border);background:var(--bg-input);cursor:pointer;justify-content:center;font-size:18px;transition:var(--transition)}.theme-toggle:hover{background:var(--bg-hover);border-color:var(--accent-primary)}.auth-wrapper{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:var(--bg-primary);position:relative;overflow:hidden}.auth-bg-orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.15;pointer-events:none}.auth-bg-orb-1{width:500px;height:500px;background:var(--accent-primary);top:-150px;right:-100px}.auth-bg-orb-2{width:400px;height:400px;background:var(--accent-secondary);bottom:-100px;left:-100px}.auth-card{width:100%;max-width:440px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:40px;box-shadow:var(--shadow-lg);position:relative;z-index:1}.auth-logo{gap:12px;margin-bottom:32px}.auth-logo,.auth-logo-icon{display:flex;align-items:center}.auth-logo-icon{width:48px;height:48px;background:var(--accent-gradient);border-radius:var(--radius-md);justify-content:center;font-size:24px}.auth-title{font-size:26px;margin-bottom:6px}.auth-subtitle{font-size:14px;color:var(--text-secondary);margin-bottom:28px}.auth-form-fields{display:flex;flex-direction:column;gap:16px;margin-bottom:24px}.auth-divider{text-align:center;color:var(--text-muted);font-size:13px;margin:16px 0;position:relative}.auth-divider:after,.auth-divider:before{content:"";position:absolute;top:50%;width:40%;height:1px;background:var(--border)}.auth-divider:before{left:0}.auth-divider:after{right:0}.auth-footer{text-align:center;margin-top:20px;font-size:14px;color:var(--text-secondary)}.auth-link{color:var(--accent-primary);font-weight:600;text-decoration:none}.auth-link:hover{text-decoration:underline}.error-message{background:var(--error-bg);color:var(--error)}.error-message,.success-message{display:flex;align-items:center;gap:8px;padding:12px 16px;border-radius:var(--radius-md);font-size:14px;font-weight:500}.success-message{background:var(--success-bg);color:var(--success)}.dashboard-header{margin-bottom:32px}.dashboard-greeting{font-size:28px;font-weight:700;margin-bottom:4px}.dashboard-greeting span{background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));grid-gap:16px;gap:16px;margin-bottom:32px}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px;display:flex;align-items:center;gap:16px;transition:var(--transition);box-shadow:var(--shadow-sm);position:relative;overflow:hidden}.stat-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--stat-accent,var(--accent-gradient));opacity:0;transition:opacity .2s}.stat-card:hover:before{opacity:1}.stat-card:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-md);transform:translateY(-2px)}.stat-card-1{--stat-accent:linear-gradient(90deg,#6366f1,#8b5cf6)}.stat-card-2{--stat-accent:linear-gradient(90deg,#10b981,#34d399)}.stat-card-3{--stat-accent:linear-gradient(90deg,#f59e0b,#fbbf24)}.stat-card-4{--stat-accent:linear-gradient(90deg,#ef4444,#f87171)}.stat-icon{width:52px;height:52px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:24px;flex-shrink:0}.stat-card-1 .stat-icon{background:rgba(99,102,241,.12)}.stat-card-2 .stat-icon{background:rgba(16,185,129,.12)}.stat-card-3 .stat-icon{background:rgba(245,158,11,.12)}.stat-card-4 .stat-icon{background:rgba(239,68,68,.12)}.stat-value{font-size:30px;font-weight:800;color:var(--text-primary);line-height:1;font-family:Space Grotesk,sans-serif}.stat-label{font-size:13px;color:var(--text-secondary);margin-top:3px;font-weight:500}.section-title{font-size:18px;font-weight:700;margin-bottom:16px;display:flex;align-items:center;gap:8px}.quiz-new-wrapper{max-width:600px;margin:0 auto}.quiz-settings-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:32px;box-shadow:var(--shadow-md)}.quiz-settings-card h2{font-size:22px;margin-bottom:24px}.settings-form{display:flex;flex-direction:column;gap:20px}.difficulty-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:10px;gap:10px}.difficulty-btn{padding:12px;border-radius:var(--radius-md);border:1.5px solid var(--border);background:var(--bg-input);cursor:pointer;text-align:center;transition:var(--transition);font-family:Inter,sans-serif}.difficulty-btn.selected,.difficulty-btn:hover{border-color:var(--accent-primary);background:var(--accent-glow)}.difficulty-btn.selected{color:var(--accent-primary);font-weight:600}.difficulty-emoji{font-size:24px;display:block;margin-bottom:4px}.difficulty-label{font-size:13px;color:var(--text-secondary)}.difficulty-btn.selected .difficulty-label{color:var(--accent-primary)}.count-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:10px;gap:10px}.count-btn{padding:12px;border-radius:var(--radius-md);border:1.5px solid var(--border);background:var(--bg-input);cursor:pointer;text-align:center;transition:var(--transition);font-family:Inter,sans-serif;font-size:16px;font-weight:600;color:var(--text-secondary)}.count-btn:hover{border-color:var(--accent-primary);background:var(--accent-glow);color:var(--accent-primary)}.count-btn.selected{border-color:var(--accent-primary);background:var(--accent-gradient);color:#fff}.quiz-wrapper{max-width:760px;margin:0 auto}.quiz-header{justify-content:space-between;margin-bottom:24px;flex-wrap:wrap}.quiz-header,.quiz-meta{display:flex;align-items:center;gap:12px}.quiz-progress-bar{height:6px;background:var(--border);border-radius:var(--radius-full);margin-bottom:32px;overflow:hidden}.quiz-progress-fill{height:100%;background:var(--accent-gradient);border-radius:var(--radius-full);transition:width .4s ease}.question-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:32px;box-shadow:var(--shadow-md);margin-bottom:20px;animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.question-number{font-size:12px;font-weight:700;color:var(--accent-primary);text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px}.question-text{font-size:18px;font-weight:600;line-height:1.5;margin-bottom:24px;color:var(--text-primary)}.options-list{display:flex;flex-direction:column;gap:10px}.option-btn{width:100%;padding:14px 20px;border-radius:var(--radius-md);border:1.5px solid var(--border);background:var(--bg-input);text-align:left;cursor:pointer;font-size:15px;font-family:Inter,sans-serif;color:var(--text-primary);transition:var(--transition);display:flex;align-items:center;gap:12px;line-height:1.4}.option-btn:hover:not(:disabled){border-color:var(--accent-primary);background:var(--accent-glow)}.option-btn:disabled{cursor:default}.option-btn.selected{border-color:var(--accent-primary);background:var(--accent-glow)}.option-btn.correct{border-color:var(--success);background:var(--success-bg);color:var(--success);font-weight:600}.option-btn.wrong{border-color:var(--error);background:var(--error-bg);color:var(--error)}.option-letter{width:28px;height:28px;border-radius:50%;background:var(--border);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0}.option-btn.correct .option-letter{background:var(--success);color:#fff}.option-btn.wrong .option-letter{background:var(--error);color:#fff}.explanation-box{margin-top:16px;padding:16px;background:var(--bg-hover);border-radius:var(--radius-md);border-left:4px solid var(--accent-primary);font-size:14px;line-height:1.6;color:var(--text-secondary);animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.explanation-box strong{color:var(--text-primary)}.quiz-actions{display:flex;justify-content:flex-end;gap:10px}.result-wrapper{max-width:600px;margin:0 auto}.result-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:40px;box-shadow:var(--shadow-lg);text-align:center}.result-score-circle{width:140px;height:140px;border-radius:50%;background:var(--accent-gradient);display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 24px;box-shadow:var(--shadow-accent)}.result-score-number{font-size:40px;font-weight:800;color:#fff;font-family:Space Grotesk,sans-serif;line-height:1}.result-score-label{font-size:12px;color:rgba(255,255,255,.8);font-weight:500}.result-title{font-size:24px;margin-bottom:8px}.result-subtitle{color:var(--text-secondary);margin-bottom:28px}.result-stats{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:12px;gap:12px;margin-bottom:28px}.result-stat{background:var(--bg-input);border-radius:var(--radius-md);padding:14px}.result-stat-value{font-size:22px;font-weight:700;color:var(--text-primary);font-family:Space Grotesk,sans-serif}.result-stat-label{font-size:12px;color:var(--text-secondary);margin-top:2px}.result-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.review-list{display:flex;flex-direction:column;gap:12px;margin-top:24px}.review-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px}.review-item.correct{border-color:var(--success);border-left:4px solid var(--success)}.review-item.wrong{border-color:var(--error);border-left:4px solid var(--error)}.history-grid{display:flex;flex-direction:column;gap:12px}.history-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;display:flex;align-items:center;gap:16px;cursor:pointer;transition:var(--transition);text-decoration:none;color:inherit}.history-item:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-md);transform:translateX(4px)}.history-icon{width:44px;height:44px;border-radius:var(--radius-md);background:var(--accent-glow);display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}.history-topic{font-weight:600;font-size:15px;margin-bottom:4px}.history-meta{font-size:13px;color:var(--text-secondary);display:flex;align-items:center;gap:8px;flex-wrap:wrap}.history-score{margin-left:auto;text-align:right;flex-shrink:0}.history-score-value{font-size:22px;font-weight:800;font-family:Space Grotesk,sans-serif}.history-score-value.high{color:var(--success)}.history-score-value.mid{color:var(--warning)}.history-score-value.low{color:var(--error)}.chat-wrapper{max-width:760px;margin:0 auto;height:calc(100vh - var(--navbar-height) - 48px);display:flex;flex-direction:column}.chat-header{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg) var(--radius-lg) 0 0;padding:16px 20px;gap:12px}.chat-avatar,.chat-header{display:flex;align-items:center}.chat-avatar{width:40px;height:40px;background:var(--accent-gradient);border-radius:50%;justify-content:center;font-size:20px}.chat-messages{flex:1 1;overflow-y:auto;background:var(--bg-card);border-left:1px solid var(--border);border-right:1px solid var(--border);padding:20px;display:flex;flex-direction:column;gap:16px;scroll-behavior:smooth}.chat-messages::-webkit-scrollbar{width:4px}.chat-messages::-webkit-scrollbar-track{background:transparent}.chat-messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.message{display:flex;gap:10px;animation:fadeIn .25s ease}.message.user{flex-direction:row-reverse}.message-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}.message-avatar.user{background:var(--accent-gradient)}.message-avatar.ai{background:var(--bg-input);border:1.5px solid var(--border)}.message-bubble{max-width:75%;padding:12px 16px;border-radius:var(--radius-lg);font-size:14px;line-height:1.6}.message.user .message-bubble{background:var(--accent-gradient);color:#fff;border-radius:var(--radius-lg) var(--radius-sm) var(--radius-lg) var(--radius-lg)}.message.ai .message-bubble{background:var(--bg-input);border:1px solid var(--border);color:var(--text-primary);border-radius:var(--radius-sm) var(--radius-lg) var(--radius-lg) var(--radius-lg)}.message-time{font-size:11px;color:var(--text-muted);margin-top:4px;text-align:right}.message.ai .message-time{text-align:left}.chat-input-area{background:var(--bg-card);border-top:1px solid var(--border);border-radius:0 0 var(--radius-lg) var(--radius-lg);border:1px solid var(--border);padding:16px}.chat-input-row{display:flex;gap:10px;align-items:flex-end}.chat-input{flex:1 1;padding:12px 16px;background:var(--bg-input);border:1.5px solid var(--border);border-radius:var(--radius-md);font-size:14px;font-family:Inter,sans-serif;color:var(--text-primary);outline:none;resize:none;max-height:120px;transition:var(--transition);line-height:1.5}.chat-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px var(--accent-glow)}.chat-suggestions{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.suggestion-chip{padding:6px 12px;border:1.5px solid var(--border);border-radius:var(--radius-full);font-size:12px;font-family:Inter,sans-serif;color:var(--text-secondary);background:var(--bg-input);cursor:pointer;transition:var(--transition)}.suggestion-chip:hover{border-color:var(--accent-primary);color:var(--accent-primary);background:var(--accent-glow)}.loading-spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--accent-primary);border-radius:50%;animation:spin .7s linear infinite;display:inline-block}@keyframes spin{to{transform:rotate(1turn)}}.loading-dots{display:flex;gap:4px;align-items:center;padding:4px 0}.loading-dots span{width:8px;height:8px;background:var(--text-muted);border-radius:50%;animation:bounce 1.2s infinite}.loading-dots span:nth-child(2){animation-delay:.2s}.loading-dots span:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{transform:scale(.6);opacity:.4}40%{transform:scale(1);opacity:1}}.generating-wrapper{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px;gap:16px}.generating-icon{font-size:48px;animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.1);opacity:.8}}.generating-text{font-size:16px}.empty-state,.generating-text{color:var(--text-secondary);text-align:center}.empty-state{padding:60px 20px}.empty-icon{font-size:48px;margin-bottom:12px}.empty-title{font-size:18px;font-weight:600;color:var(--text-primary);margin-bottom:8px}.empty-desc{font-size:14px;margin-bottom:20px}.gradient-text{background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}@media (max-width:768px){.stats-grid{grid-template-columns:repeat(2,1fr)}.nav-link span{display:none}.question-card,.quiz-settings-card{padding:20px}.result-stats{grid-template-columns:repeat(3,1fr)}.auth-card{padding:28px}.chat-wrapper{height:calc(100vh - var(--navbar-height) - 32px)}.message-bubble{max-width:90%}}@media (max-width:480px){.stats-grid{grid-template-columns:1fr 1fr}.count-grid,.difficulty-grid,.result-stats{grid-template-columns:repeat(3,1fr)}}.flashcard-container{perspective:1000px;cursor:pointer}.flashcard-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.23,1,.32,1)}.flashcard-inner.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius-xl);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;text-align:center}.flashcard-front{background:var(--bg-card);border:1.5px solid var(--border);box-shadow:var(--shadow-md)}.flashcard-back{background:var(--accent-gradient);transform:rotateY(180deg);box-shadow:var(--shadow-accent)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));grid-gap:16px;gap:16px}.tool-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;text-decoration:none;color:inherit;display:flex;flex-direction:column;gap:12px;transition:var(--transition);cursor:pointer}.tool-card:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-md);transform:translateY(-3px)}.tool-icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:26px;flex-shrink:0;box-shadow:0 4px 14px rgba(0,0,0,.15)}.schedule-day{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px 20px;transition:var(--transition)}.schedule-day:hover{box-shadow:var(--shadow-sm)}input[type=range]{-webkit-appearance:none;-moz-appearance:none;appearance:none;height:6px;border-radius:var(--radius-full);background:var(--border);outline:none;padding:0}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:var(--accent-primary);cursor:pointer;box-shadow:0 2px 8px rgba(99,102,241,.4);-webkit-transition:var(--transition);transition:var(--transition)}input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.2)}.count-grid-4{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:10px;gap:10px}.tutor-mode-btn{display:flex;align-items:center;gap:8px;padding:8px 16px;border-radius:var(--radius-full);border:1.5px solid var(--border);background:var(--bg-card);cursor:pointer;font-size:13px;font-weight:600;color:var(--text-secondary);font-family:Inter,sans-serif;transition:var(--transition)}