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var(--transition-fast)}.nav-link:hover{color:var(--color-text-primary);background:var(--color-background)}.nav-link.active{color:var(--color-primary);background:#4a90d91a}.header-user{display:flex;align-items:center;gap:var(--spacing-sm)}.user-avatar{width:36px;height:36px;background:var(--color-background);border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center}.user-name{font-weight:500;color:var(--color-text-primary)}@media (max-width: 768px){.header-container{padding:0 var(--spacing-md)}.user-name{display:none}}.user-avatar img{width:100%;height:100%;border-radius:50%;object-fit:cover}.login-btn{padding:var(--spacing-xs) var(--spacing-md);background:var(--color-primary);color:#fff;border-radius:var(--radius-md);font-weight:600;font-size:var(--font-size-sm);transition:background .2s}.login-btn:hover{background:var(--color-primary-dark)}.logout-btn{padding:var(--spacing-xs) var(--spacing-sm);background:transparent;border:1px solid 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auto}.hero-section{position:relative;min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;overflow:hidden;background:linear-gradient(135deg,#0a1628,#1a2d4a,#0f1c30);padding:var(--spacing-2xl)}.hero-bg-container{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;overflow:hidden}.hero-orb{position:absolute;border-radius:50%;filter:blur(60px);opacity:.6;transition:transform .1s ease-out;animation:orbFloat 8s ease-in-out infinite}.hero-orb-1{width:400px;height:400px;background:radial-gradient(circle,var(--color-primary) 0%,transparent 70%);top:-100px;right:-100px;animation-delay:0s}.hero-orb-2{width:350px;height:350px;background:radial-gradient(circle,var(--color-accent) 0%,transparent 70%);bottom:-50px;left:-100px;animation-delay:-3s}.hero-orb-3{width:250px;height:250px;background:radial-gradient(circle,#8B5CF6 0%,transparent 70%);top:50%;left:50%;transform:translate(-50%,-50%);animation-delay:-5s}.hero-orb-4{width:180px;height:180px;background:radial-gradient(circle,#58CC02 0%,transparent 70%);top:20%;left:15%;animation-delay:-2s}.hero-orb-5{width:120px;height:120px;background:radial-gradient(circle,#FF6B6B 0%,transparent 70%);bottom:30%;right:20%;animation-delay:-7s}@keyframes orbFloat{0%,to{transform:translateY(0) scale(1)}50%{transform:translateY(-20px) scale(1.05)}}.hero-particles{position:absolute;top:0;right:0;bottom:0;left:0;overflow:hidden}.particle{position:absolute;width:4px;height:4px;background:#ffffff4d;border-radius:50%;animation:particleFloat linear infinite}.particle-0{left:10%;animation-duration:15s;animation-delay:0s}.particle-1{left:25%;animation-duration:18s;animation-delay:-3s}.particle-2{left:45%;animation-duration:12s;animation-delay:-6s}.particle-3{left:70%;animation-duration:20s;animation-delay:-9s}.particle:nth-child(5){left:85%;animation-duration:14s;animation-delay:-2s}.particle:nth-child(6){left:15%;animation-duration:16s;animation-delay:-5s}.particle:nth-child(7){left:35%;animation-duration:19s;animation-delay:-8s}.particle:nth-child(8){left:55%;animation-duration:13s;animation-delay:-1s}.particle:nth-child(9){left:75%;animation-duration:17s;animation-delay:-4s}.particle:nth-child(10){left:90%;animation-duration:15s;animation-delay:-7s}.particle:nth-child(11){left:5%;animation-duration:21s;animation-delay:-10s}.particle:nth-child(12){left:30%;animation-duration:11s;animation-delay:-3s}.particle:nth-child(13){left:50%;animation-duration:22s;animation-delay:-6s}.particle:nth-child(14){left:65%;animation-duration:14s;animation-delay:-9s}.particle:nth-child(15){left:80%;animation-duration:18s;animation-delay:-2s}.particle:nth-child(16){left:20%;animation-duration:16s;animation-delay:-5s}.particle:nth-child(17){left:40%;animation-duration:13s;animation-delay:-8s}.particle:nth-child(18){left:60%;animation-duration:20s;animation-delay:-1s}.particle:nth-child(19){left:82%;animation-duration:17s;animation-delay:-4s}.particle:nth-child(20){left:95%;animation-duration:15s;animation-delay:-7s}@keyframes particleFloat{0%{transform:translateY(100vh) scale(0);opacity:0}10%{opacity:.6;transform:translateY(90vh) scale(1)}90%{opacity:.6}to{transform:translateY(-10vh) scale(.5);opacity:0}}.hero-grid-pattern{position:absolute;top:0;right:0;bottom:0;left:0;background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);background-size:50px 50px;animation:gridMove 20s linear infinite}@keyframes gridMove{0%{transform:translate(0)}to{transform:translate(50px,50px)}}.hero-content{position:relative;z-index:10;text-align:center;max-width:800px;animation:fadeInUp .8s ease-out}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;background:#ffffff1a;border:1px solid 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300%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1.2;animation:gradientShift 6s ease infinite,textGlow 3s ease-in-out infinite alternate}@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}@keyframes textGlow{0%{filter:drop-shadow(0 0 10px rgba(28,176,246,.3))}to{filter:drop-shadow(0 0 25px rgba(255,200,0,.5))}}.hero-highlight em{font-style:normal;background:linear-gradient(135deg,var(--color-accent),#FFE066,var(--color-accent));background-size:200% 200%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:accentShift 3s ease infinite}@keyframes accentShift{0%,to{background-position:0% 50%}50%{background-position:100% 50%}}.hero-description{font-size:var(--font-size-lg);color:#ffffffb3;line-height:1.8;margin-bottom:var(--spacing-xl);animation:fadeSlideIn .8s ease-out .4s both}.hero-accent{color:var(--color-accent);font-weight:600;animation:accentPulse 2s ease-in-out infinite}@keyframes accentPulse{0%,to{text-shadow:0 0 0 rgba(255,200,0,0)}50%{text-shadow:0 0 15px rgba(255,200,0,.6)}}.hero-cta-group{display:flex;gap:var(--spacing-md);justify-content:center;flex-wrap:wrap;margin-bottom:var(--spacing-lg)}.hero-cta{display:inline-flex;align-items:center;gap:8px;padding:16px 32px;font-size:var(--font-size-base);font-weight:600;border-radius:50px;transition:all .3s ease}.btn-secondary{background:transparent;border:2px solid rgba(255,255,255,.3);color:#fff}.btn-secondary:hover{background:#ffffff1a;border-color:#ffffff80;transform:translateY(-2px)}.logout-btn-floating{position:absolute;top:var(--spacing-lg);right:var(--spacing-lg);background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#ffffffb3;padding:8px 16px;border-radius:8px;cursor:pointer;font-size:var(--font-size-sm);transition:all .2s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.logout-btn-floating:hover{background:#ff4b4b33;border-color:#ff4b4b80;color:#ff4b4b}.login-btn-floating{position:absolute;top:var(--spacing-lg);right:var(--spacing-lg);background:#1cb0f633;border:1px solid rgba(28,176,246,.4);color:#ffffffe6;padding:8px 20px;border-radius:8px;cursor:pointer;font-size:var(--font-size-sm);font-weight:600;transition:all .2s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);text-decoration:none}.login-btn-floating:hover{background:#1cb0f666;border-color:#1cb0f699;color:#fff;transform:translateY(-2px);box-shadow:0 4px 15px #1cb0f64d}.scroll-indicator{position:absolute;bottom:var(--spacing-xl);left:50%;transform:translate(-50%);display:flex;flex-direction:column;align-items:center;gap:8px;color:#ffffff80;font-size:var(--font-size-sm);cursor:pointer;animation:bounce 2s infinite}.scroll-mouse{width:24px;height:40px;border:2px solid 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.progress-bar{margin-bottom:var(--spacing-xs)}.progress-text{font-size:var(--font-size-xs);color:var(--color-text-muted)}.course-footer{padding:var(--spacing-md) var(--spacing-lg);border-top:1px solid var(--color-border-light);background:var(--color-background)}.features-section{margin-bottom:var(--spacing-2xl)}.features-section h2{text-align:center;margin-bottom:var(--spacing-xl)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--spacing-lg)}.feature-card{text-align:center;padding:var(--spacing-xl);background:var(--color-surface);border-radius:var(--radius-lg);border:1px solid var(--color-border-light)}.feature-icon-img{width:60px;height:60px;object-fit:contain;margin-bottom:var(--spacing-md);mix-blend-mode:multiply}.feature-card h3{font-size:var(--font-size-base);margin-bottom:var(--spacing-sm)}.feature-card p{font-size:var(--font-size-sm);color:var(--color-text-secondary);line-height:1.6}.tier-badge{position:absolute;top:12px;right:12px;padding:4px 10px;font-size:11px;font-weight:600;border-radius:20px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.tier-badge.free{background:#58cc0233;color:#58cc02;border:1px solid rgba(88,204,2,.3)}.tier-badge.gold{background:linear-gradient(135deg,#ffc8004d,#ff96004d);color:gold;border:1px solid rgba(255,200,0,.4);animation:goldShimmer 3s ease-in-out infinite}@keyframes goldShimmer{0%,to{box-shadow:0 0 5px #ffc8004d}50%{box-shadow:0 0 15px #ffc80080}}.course-card.locked{opacity:.85;position:relative}.course-card.locked:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,rgba(0,0,0,.1) 0%,transparent 50%);pointer-events:none;border-radius:var(--radius-lg)}.btn-gold{background:linear-gradient(135deg,gold,orange);color:#1a1a2e;border:none;font-weight:600}.btn-gold:hover{background:linear-gradient(135deg,#ffe44d,#ffb835);transform:translateY(-1px);box-shadow:0 4px 15px #ffc8004d}.course-image{position:relative}.lesson-action-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);display:flex;justify-content:center;align-items:center;z-index:1000;padding:1rem}.lesson-action-modal{background:linear-gradient(135deg,#fff,#f8fafc);border-radius:20px;padding:2rem;max-width:420px;width:100%;position:relative;box-shadow:0 25px 80px #00000040;border:1px solid rgba(255,255,255,.8)}.modal-close-btn{position:absolute;top:1rem;right:1rem;width:36px;height:36px;border-radius:50%;border:none;background:#f1f5f9;color:#64748b;font-size:1.25rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s}.modal-close-btn:hover{background:#e2e8f0;color:#334155}.modal-title{font-size:1.35rem;font-weight:700;color:#1e293b;margin:0 0 .5rem;text-align:center}.modal-subtitle{font-size:.95rem;color:#64748b;margin:0 0 1.75rem;text-align:center;padding:0 1rem}.modal-actions{display:flex;flex-direction:column;gap:1rem}.action-btn{display:flex;align-items:center;gap:1rem;padding:1.25rem 1.5rem;border-radius:14px;border:2px solid #e2e8f0;background:#fff;cursor:pointer;transition:all .25s ease;text-align:left}.action-btn:hover{transform:translateY(-3px);box-shadow:0 8px 20px #0000001f}.action-icon{font-size:2rem;flex-shrink:0}.action-text{display:flex;flex-direction:column;gap:.35rem}.action-text strong{font-size:1.1rem;font-weight:600;color:#1e293b}.action-text small{font-size:.85rem;color:#64748b}.relearn-btn{border-color:#e0e7ff;background:linear-gradient(135deg,#f5f3ff,#ede9fe)}.relearn-btn:hover{border-color:#6366f1;background:linear-gradient(135deg,#eef2ff,#e0e7ff)}.relearn-btn .action-icon{background:linear-gradient(135deg,#6366f1,#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.relearn-btn .action-text strong{color:#4338ca}.review-btn{border-color:#d1fae5;background:linear-gradient(135deg,#ecfdf5,#d1fae5)}.review-btn:hover{border-color:#10b981;background:linear-gradient(135deg,#d1fae5,#a7f3d0)}.review-btn .action-icon{background:linear-gradient(135deg,#10b981,#059669);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.review-btn .action-text strong{color:#047857}@media (max-width: 480px){.lesson-action-modal{margin:1rem;padding:1.5rem}.action-btn{padding:1rem}}.course-page{min-height:100vh;background:linear-gradient(180deg,#f0f4ff,#fff 30%);padding-bottom:60px}.course-header{text-align:center;padding:40px 24px;position:relative}.back-btn{position:absolute;left:24px;top:24px;color:var(--color-text-secondary);text-decoration:none;font-size:var(--font-size-sm)}.back-btn:hover{color:var(--color-primary)}.course-header h1{font-size:var(--font-size-2xl);margin-bottom:8px}.course-header p{color:var(--color-text-secondary)}.learning-path{max-width:400px;margin:0 auto;padding:0 24px}.path-module{margin-bottom:60px}.module-header{text-align:center;margin-bottom:32px}.module-level{display:inline-block;padding:4px 16px;background:var(--color-primary);color:#fff;border-radius:20px;font-size:var(--font-size-sm);font-weight:600;margin-bottom:8px}.module-title{font-size:var(--font-size-lg);color:var(--color-text-primary)}.path-lessons{display:flex;flex-direction:column;align-items:center;gap:0}.lesson-node-wrapper{position:relative;width:100%;display:flex;flex-direction:column;align-items:center}.path-connector{width:3px;height:40px;background:var(--color-border);margin-bottom:8px}.path-connector.completed{background:var(--color-success)}.lesson-node{display:flex;flex-direction:column;align-items:center;text-decoration:none;width:100%;padding:16px;border-radius:var(--radius-xl);transition:all var(--transition-base);background:#fff;border:2px solid transparent}.lesson-node.active{background:#fff;border-color:var(--color-primary-light);box-shadow:0 4px 12px #1cb0f626}.lesson-node.active:hover{border-color:var(--color-primary);transform:translateY(-2px);box-shadow:0 6px 16px #1cb0f640}.lesson-node.completed{background:#fff;border-color:var(--color-primary-light)}.lesson-node.practice{background:linear-gradient(135deg,#fffdf5,#fff9e6);border:2px solid #FFE082}.lesson-node.practice.active{background:linear-gradient(135deg,#fffdf5,#fff9e6);box-shadow:0 4px 12px #ffc80040;border-color:var(--color-accent)}.lesson-node.practice.completed{background:linear-gradient(135deg,#fffdf5,#fff9e6);border-color:#ffd54f;opacity:.9}.lesson-node.practice .node-circle{background:#fff;border:2px solid var(--color-accent);color:var(--color-accent)}.lesson-node.practice.active .node-circle{background:var(--color-accent);color:#fff;border-color:var(--color-accent)}.lesson-node.practice.completed .node-circle{background:#fff;border-color:var(--color-success);color:var(--color-success)}.lesson-node.practice .node-title{color:#b28900;font-weight:700}.lesson-node.locked{opacity:.5}.lesson-node:hover:not(.locked){transform:translateY(-2px)}.node-circle{width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:12px;font-weight:700;font-size:var(--font-size-lg)}.lesson-node.active .node-circle{background:var(--color-primary);color:#fff}.lesson-node.completed .node-circle{background:#fff;border:2px solid var(--color-success);color:var(--color-success)}.lesson-node.locked .node-circle{background:var(--color-border-light);border:2px solid var(--color-border);color:var(--color-text-muted)}.node-check,.node-lock{display:flex;align-items:center;justify-content:center;width:100%;height:100%}.icon-check-img,.icon-lock-img{width:32px;height:32px;object-fit:contain;mix-blend-mode:multiply}.node-title{font-size:var(--font-size-base);font-weight:500;color:var(--color-text-primary);text-align:center;margin-bottom:8px}.lesson-node.locked .node-title{color:var(--color-text-muted)}.node-stars{display:flex;gap:4px}.star{font-size:16px;color:var(--color-border)}.star.filled{color:#ffb800}@media (max-width: 640px){.course-header{padding:24px 16px}.back-btn{position:static;display:block;margin-bottom:16px}.learning-path{padding:0 16px}}.course-not-found{display:flex;align-items:center;justify-content:center;height:100vh;color:var(--color-text-muted)}.retry-cooldown{display:flex;align-items:center;justify-content:center;padding:16px 0}.cooldown-container{display:flex;align-items:center;gap:16px;background:#ffffff0d;padding:12px 24px;border-radius:12px;border:1px solid rgba(255,255,255,.1)}.cooldown-circle{position:relative;width:48px;height:48px}.cooldown-svg{width:100%;height:100%;transform:rotate(-90deg)}.cooldown-bg{fill:none;stroke:#ffffff1a;stroke-width:3}.cooldown-progress{fill:none;stroke:#f97316;stroke-width:3;stroke-linecap:round;transition:stroke-dasharray 1s 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translateY(0);opacity:1}.completion-popup-content.excellent{border-color:gold;box-shadow:0 25px 50px #00000080,0 0 60px #ffd70033}.completion-popup-content.good{border-color:#4ade80;box-shadow:0 25px 50px #00000080,0 0 40px #4ade8026}.completion-popup-content.fair{border-color:#60a5fa}.completion-popup-content.needs-improvement{border-color:#f97316}.completion-icon{font-size:64px;margin-bottom:16px;animation:bounce .6s ease infinite alternate}@keyframes bounce{0%{transform:translateY(0)}to{transform:translateY(-10px)}}.completion-title{font-size:28px;font-weight:700;color:#fff;margin:0 0 8px}.user-name{color:gold}.completion-lesson{color:#ffffffb3;font-size:14px;margin:16px 0 8px}.lesson-title-display{font-size:18px;font-weight:600;color:#60a5fa;margin:0 0 24px;line-height:1.4}.score-display{background:#ffffff0d;border-radius:16px;padding:24px;margin:24px 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16px;background:transparent;border:none;color:var(--color-primary);font-weight:500;cursor:pointer;font-size:var(--font-size-sm)}.retry-btn:hover{text-decoration:underline}.text-muted{color:var(--color-text-muted)}.mb-md{margin-bottom:var(--spacing-md)}.mb-lg{margin-bottom:var(--spacing-lg)}.mt-md{margin-top:var(--spacing-md)}.mt-lg{margin-top:var(--spacing-lg)}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.02)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.btn{transition:all var(--transition-base)}.btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #1cb0f640}.btn:active:not(:disabled){transform:translateY(0)}.course-card,.feature-card,.enrolled-card{transition:all .3s cubic-bezier(.4,0,.2,1)}.course-card:hover,.feature-card:hover,.enrolled-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px #1cb0f626}.feature-icon-img,.course-thumb,.logo-img{transition:transform .4s ease}.feature-card:hover .feature-icon-img,.course-card:hover .course-thumb{animation:float 2s ease-in-out infinite}a:not(.btn):not(.course-card):not(.lesson-node){position:relative}a:not(.btn):not(.course-card):not(.lesson-node):after{content:"";position:absolute;bottom:-2px;left:0;width:0;height:2px;background:var(--color-primary);transition:width .3s ease}a:not(.btn):not(.course-card):not(.lesson-node):hover:after{width:100%}.progress-bar-fill{transition:width .6s cubic-bezier(.4,0,.2,1)}.star.filled{transition:transform .2s ease,filter .2s ease}.node-stars:hover .star.filled{filter:drop-shadow(0 0 4px #FFB800)}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}.star-quiz{text-align:center}.quiz-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl)}.quiz-label{font-size:var(--font-size-sm);font-weight:600;color:var(--color-primary);text-transform:uppercase;letter-spacing:.05em}.quiz-progress{display:flex;gap:4px}.quiz-star{font-size:20px;color:var(--color-border)}.quiz-star.earned{color:#ffb800}.quiz-question-num{font-size:var(--font-size-sm);color:var(--color-text-muted);margin-bottom:var(--spacing-md);display:flex;align-items:center;justify-content:center;gap:8px}.challenge-badge{background:linear-gradient(135deg,#ffb800,#ff6b00);color:#fff;padding:2px 8px;border-radius:10px;font-size:12px;font-weight:600}.quiz-question{font-size:var(--font-size-lg);font-weight:500;margin-bottom:var(--spacing-xl);line-height:1.5}.quiz-options{display:flex;flex-direction:column;gap:var(--spacing-sm)}.quiz-option{display:flex;align-items:center;gap:var(--spacing-md);width:100%;padding:14px 18px;background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-lg);text-align:left;font-family:var(--font-family);font-size:var(--font-size-base);color:var(--color-text-primary);cursor:pointer;transition:all var(--transition-fast)}.quiz-option:hover:not(:disabled){border-color:var(--color-primary)}.quiz-option.correct{border-color:var(--color-success);background:var(--color-success-light)}.quiz-option.incorrect{border-color:var(--color-error);background:var(--color-error-light)}.quiz-option:disabled{cursor:default}.star-quiz-result{text-align:center;padding:var(--spacing-2xl) 0;animation:fadeIn .5s ease}.result-stars{display:flex;justify-content:center;gap:8px;margin-bottom:var(--spacing-lg)}.big-star{font-size:48px;color:var(--color-border);transition:all .3s ease}.big-star.filled{color:#ffb800;animation:popIn .3s ease}@keyframes popIn{0%{transform:scale(.5)}70%{transform:scale(1.2)}to{transform:scale(1)}}.result-text{color:var(--color-text-secondary);margin-top:var(--spacing-sm)}.sort-pool{margin-bottom:var(--spacing-lg)}.sort-pool-title{font-size:var(--font-size-sm);color:var(--color-text-secondary);margin-bottom:var(--spacing-sm)}.sort-items{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}.sort-chip{display:inline-block;padding:var(--spacing-sm) var(--spacing-md);background:var(--color-primary-light);border:2px solid transparent;border-radius:var(--radius-lg);font-size:var(--font-size-sm);color:var(--color-primary);cursor:pointer;transition:all var(--transition-fast)}.sort-chip:hover{border-color:var(--color-primary)}.sort-chip.selected{background:var(--color-primary);color:#fff;transform:scale(1.05);box-shadow:0 4px 12px #1652f04d}.sort-categories{display:flex;flex-direction:column;gap:var(--spacing-md)}@media (min-width: 600px){.sort-categories{flex-direction:row}}.sort-zone{flex:1;min-height:120px;border:2px dashed var(--color-border);border-radius:var(--radius-lg);transition:all var(--transition-fast);cursor:pointer}.sort-zone.accepting{border-color:var(--color-primary);background:var(--color-primary-light)}.sort-zone-header{padding:var(--spacing-sm) var(--spacing-md);background:var(--color-border-light);border-radius:var(--radius-lg) var(--radius-lg) 0 0;font-weight:600;font-size:var(--font-size-sm);text-align:center}.sort-zone-content{padding:var(--spacing-md);display:flex;flex-direction:column;gap:var(--spacing-xs)}.zone-placeholder{text-align:center;color:var(--color-text-muted);font-size:var(--font-size-sm);padding:var(--spacing-lg)}.placed-chip{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-sm) var(--spacing-md);background:#fff;border-radius:var(--radius-md);font-size:var(--font-size-sm);box-shadow:var(--shadow-sm)}.placed-chip.correct{background:var(--color-success-light);border-left:3px solid var(--color-success)}.placed-chip.incorrect{background:var(--color-error-light);border-left:3px solid var(--color-error)}.remove-btn{background:none;border:none;font-size:18px;color:var(--color-text-muted);cursor:pointer;transition:color var(--transition-fast)}.remove-btn:hover{color:var(--color-error)}.tooltip-wrapper{position:relative;display:inline}.tooltip-term{text-decoration:underline;text-decoration-style:dotted;text-underline-offset:2px;cursor:help;color:var(--color-primary)}.tooltip-popup{position:absolute;bottom:100%;left:50%;transform:translate(-50%);padding:var(--spacing-sm) var(--spacing-md);background:var(--color-text-primary);color:#fff;font-size:var(--font-size-sm);border-radius:var(--radius-md);white-space:nowrap;max-width:280px;white-space:normal;z-index:100;box-shadow:var(--shadow-md);margin-bottom:4px}.tooltip-popup:after{content:"";position:absolute;top:100%;left:50%;transform:translate(-50%);border:6px solid transparent;border-top-color:var(--color-text-primary)}.chip-hint{width:100%;font-size:var(--font-size-sm);color:var(--color-text-muted);margin-bottom:var(--spacing-sm)}.feedback-neutral{background:var(--color-primary-light);border-left:3px solid var(--color-primary)}.feedback-neutral .feedback-title{color:var(--color-primary)}