@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";@media (prefers-reduced-motion:reduce){*{transition:none!important}}@media (width<=900px){:root{--grid-cols:2}}.landing-container{background:var(--bg-1);width:100%;color:var(--text);min-height:100vh;overflow-x:hidden}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes 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label.correct:after{content:"✓";right:var(--g-x);color:var(--success);animation:bounceIn var(--trans) var(--ease);font-size:18px;font-weight:700;position:absolute}.options-list label.incorrect{border-color:var(--danger);background:var(--danger-light);animation:.5s ease-out shake}.options-list label.incorrect:after{content:"✗";right:var(--g-x);color:var(--danger);animation:bounceIn var(--trans) var(--ease);font-size:18px;font-weight:700;position:absolute}.options-list label.incorrect:before{border-color:var(--danger);background:var(--danger);animation:.5s ease-out shake}.options-list input:disabled+label{pointer-events:none;opacity:.8}.quiz-submit-btn{width:100%;max-width:400px;margin:var(--g-xx) auto 0;font-size:var(--fs-base);background:linear-gradient(135deg, var(--primary) 0%, var(--primary-600) 100%);color:#fff;border-radius:var(--pill-radius);cursor:pointer;transition:all var(--trans) var(--ease);text-transform:uppercase;letter-spacing:.5px;border:none;min-height:56px;padding:16px 32px;font-weight:700;display:block;position:relative;overflow:hidden;box-shadow:0 8px 24px #06f6,0 0 #06f3}.quiz-submit-btn:before{content:"";width:0;height:0;transition:width var(--trans) var(--ease), height var(--trans) var(--ease);background:#ffffff4d;border-radius:50%;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.quiz-submit-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 12px 32px #06f9,0 0 #0066ff4d}.quiz-submit-btn:hover:not(:disabled):before{width:300px;height:300px}.quiz-submit-btn:active:not(:disabled){animation:buttonPress .3s var(--ease);transform:translateY(0);box-shadow:0 4px 12px #06f6,0 0 #0066ff26}.quiz-submit-btn:disabled{opacity:.6;cursor:not-allowed;background:var(--text-muted);box-shadow:none}.quiz-score{text-align:center;margin:var(--g-xx) 0;color:var(--success);animation:slideUp var(--trans) var(--ease);font-size:36px;font-weight:800}.quiz-score:before{content:"🎉 ";margin-right:var(--g)}.quiz-feedback{margin-top:var(--g-xx);padding:var(--g-xx);background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-lg)}.question-result{margin-bottom:var(--g-x);padding:var(--g-x);background:var(--bg);border-radius:var(--radius-md);border-left:4px solid var(--border)}.question-result.correct{border-left-color:var(--success);background:var(--success-light)}.question-result.incorrect{border-left-color:var(--danger);background:var(--danger-light)}.question-result h4{margin:0 0 var(--g) 0;font-size:var(--fs-base);color:var(--text-main);font-weight:700}.question-result p{font-size:var(--fs-sm);color:var(--text);margin:0 0 var(--g) 0;line-height:1.5}.question-result ul{margin:var(--g) 0 0 0;padding-left:0;list-style:none}.question-result li{border-radius:var(--radius-sm);font-size:var(--fs-sm);align-items:center;gap:var(--g-sm);margin-bottom:6px;padding:8px 12px;display:flex}.question-result .correct{color:var(--success);border-left:3px solid var(--success);background:#16a34a26;padding-left:12px;font-weight:600}.question-result .correct:before{content:"✓";font-weight:700}.question-result .incorrect{color:var(--danger);border-left:3px solid var(--danger);background:#ef444426;padding-left:12px;text-decoration:line-through}.question-result .incorrect:before{content:"✗";font-weight:700}.quiz-container p{text-align:center;font-size:var(--fs-lg);color:var(--text-muted);padding:var(--g-xx)}@media (width<=768px){.quiz-container{padding:var(--g)}.question-block{padding:var(--g-x)}.question-text{font-size:var(--fs-lg)}.options-list label{padding:var(--g);min-height:56px}.quiz-submit-btn{max-width:100%;font-size:var(--fs-sm)}.quiz-score{font-size:28px}}:root{--primary:#06f;--primary-600:#0052cc;--primary-light:#e6f0ff;--success:#10b981;--success-light:#d1fae5;--warning:#f59e0b;--warning-light:#fef3c7;--danger:#ef4444;--danger-light:#fee2e2;--text-main:#1f2937;--text-muted:#6b7280;--border:#e5e7eb;--surface:#fff;--background:#f9fafb;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a;--radius-sm:6px;--radius-md:8px;--radius-lg:12px;--trans:.3s;--ease:cubic-bezier(.4, 0, .2, 1);--g:16px;--g-x:24px;--g-sm:12px;--fs-sm:13px;--fs-base:14px;--fs-lg:18px;--fs-xl:24px;--fs-xxl:32px}@keyframes slideIn{0%{opacity:0;transform:translate(-16px)}to{opacity:1;transform:translate(0)}}@keyframes hoverLift{0%{transform:translateY(0)}to{transform:translateY(-4px)}}@keyframes checkmarkAppear{0%{opacity:0;transform:scale(.5)rotate(-45deg)}50%{opacity:1}to{opacity:1;transform:scale(1)rotate(0)}}@keyframes expandIn{0%{opacity:0;max-height:0}to{opacity:1;max-height:200px}}.lesson-page-bg{background-color:var(--background);min-height:100vh;padding-bottom:60px}.lesson-page-layout{gap:var(--g-x);max-width:1440px;padding:0 var(--g-x);margin:0 auto;margin-top:var(--g-x);animation:slideUp var(--trans) var(--ease);grid-template-columns:1fr 360px;align-items:start;display:grid}.lesson-main{gap:var(--g-x);flex-direction:column;min-width:0;display:flex}.video-player-wrapper{aspect-ratio:16/9;border-radius:var(--radius-lg);width:100%;box-shadow:var(--shadow-lg);background:#0f172a;position:relative;overflow:hidden}.video-iframe{border:none;width:100%;height:100%}.no-video-fallback{height:100%;color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;display:flex}.fallback-icon{opacity:.5;margin-bottom:16px;font-size:48px}.lesson-details-card{background:var(--surface);border-radius:var(--radius-lg);padding:var(--g-x);box-shadow:var(--shadow-md);border:1px solid var(--border)}.lesson-header-flex{justify-content:space-between;align-items:flex-start;gap:var(--g-x);margin-bottom:var(--g-x);flex-wrap:wrap;display:flex}.lesson-title-large{color:var(--text-main);margin:0 0 12px;font-size:24px;font-weight:800;line-height:1.3}.lesson-meta-info{gap:8px;display:flex}.meta-badge{border-radius:4px;padding:4px 10px;font-size:12px;font-weight:600}.meta-badge.quiz{background:var(--warning-light);color:#d97706}.meta-badge.completed{background:var(--success-light);color:var(--success)}.lesson-primary-actions{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.btn-mark-complete{background:var(--primary);color:#fff;border-radius:var(--radius-md);cursor:pointer;border:none;align-items:center;gap:8px;padding:12px 20px;font-size:14px;font-weight:600;transition:all .2s;display:inline-flex;box-shadow:0 4px 12px #06f3}.btn-mark-complete:hover{background:var(--primary-600);transform:translateY(-2px);box-shadow:0 6px 16px #0066ff4d}.btn-next-lesson{background:var(--surface);color:var(--primary);border:2px solid var(--primary);border-radius:var(--radius-md);cursor:pointer;align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:600;transition:all .2s;display:inline-flex}.btn-next-lesson:hover:not(.disabled){background:var(--primary-light);transform:translateY(-2px)}.btn-next-lesson.disabled{opacity:.5;cursor:not-allowed;border-color:var(--border);color:var(--text-muted)}.btn-quiz{border-radius:var(--radius-md);cursor:pointer;color:#fff;border:none;align-items:center;gap:8px;padding:12px 20px;font-size:14px;font-weight:600;transition:all .2s;display:inline-flex}.btn-quiz.pending{background:#f59e0b;box-shadow:0 4px 12px #f59e0b33}.btn-quiz.passed{background:#0ea5e9;box-shadow:0 4px 12px #0ea5e933}.btn-quiz:hover{filter:brightness(1.1);transform:translateY(-2px)}.btn-finish-course{background:var(--success);color:#fff;border-radius:var(--radius-md);cursor:pointer;border:none;padding:12px 20px;font-size:14px;font-weight:600;transition:all .2s}.btn-finish-course:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 16px #10b9814d}.btn-finish-course:disabled{opacity:.5;cursor:not-allowed}.quiz-warning-banner{color:#b45309;margin-bottom:var(--g-x);background:#fffbeb;border-left:4px solid #f59e0b;border-radius:4px;padding:12px 16px;font-size:14px;font-weight:500}.lesson-tabs{border-bottom:1px solid var(--border);gap:24px;margin-bottom:24px;display:flex}.tab-btn{color:var(--text-muted);cursor:pointer;background:0 0;border:none;padding:12px 0;font-size:15px;font-weight:600;transition:color .2s;position:relative}.tab-btn:hover{color:var(--text-main)}.tab-btn.active{color:var(--primary)}.tab-btn.active:after{content:"";background:var(--primary);border-radius:3px 3px 0 0;width:100%;height:3px;position:absolute;bottom:-1px;left:0}.lesson-tab-content{min-height:150px}.content-overview h3{margin:0 0 12px;font-size:18px;font-weight:700}.content-text{color:var(--text-main);font-size:15px;line-height:1.6}.content-empty{color:var(--text-muted);background:var(--background);border-radius:var(--radius-md);border:1px dashed var(--border);flex-direction:column;justify-content:center;align-items:center;padding:40px;display:flex}.content-empty .empty-icon{margin-bottom:12px;font-size:32px}.lesson-sidebar{gap:var(--g-x);flex-direction:column;display:flex;position:sticky;top:24px}.sidebar-playlist-card{background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:1px solid var(--border);flex-direction:column;max-height:calc(100vh - 200px);display:flex;overflow:hidden}.playlist-title{border-bottom:1px solid var(--border);background:var(--background);margin:0;padding:20px;font-size:16px;font-weight:700}.playlist-scroll{flex-direction:column;gap:8px;padding:12px;display:flex;overflow-y:auto}.playlist-scroll::-webkit-scrollbar{width:6px}.playlist-scroll::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:10px}.playlist-item{border-radius:var(--radius-md);cursor:pointer;border:1px solid #0000;align-items:flex-start;gap:12px;padding:12px;transition:all .2s;display:flex}.playlist-item:hover:not(.locked):not(.current){background:var(--background);border-color:var(--border)}.playlist-item.current{background:var(--primary-light);border-color:#06f3}.playlist-item.locked{opacity:.6;cursor:not-allowed}.playlist-item.completed .item-icon{background:var(--success-light);color:var(--success)}.item-icon{width:28px;height:28px;color:var(--text-muted);background:#f1f5f9;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:12px;font-weight:700;display:flex}.playlist-item.current .item-icon{background:var(--primary);color:#fff}.item-content{flex:1}.item-title{color:var(--text-main);margin-bottom:4px;font-size:14px;font-weight:600;line-height:1.4}.playlist-item.current .item-title{color:var(--primary)}.item-duration{color:var(--text-muted);align-items:center;gap:8px;font-size:12px;display:flex}.item-badge{background:var(--warning-light);color:#d97706;border-radius:4px;padding:2px 6px;font-size:10px;font-weight:600}.toast-notification{border-left:4px solid var(--success);z-index:1000;background:#fff;border-radius:8px;align-items:center;gap:16px;padding:16px 20px;animation:.3s slideInRight,.3s 2.7s forwards fadeOut;display:flex;position:fixed;bottom:24px;right:24px;box-shadow:0 10px 25px #00000026}@keyframes fadeOut{to{opacity:0;visibility:hidden}}.toast-icon{font-size:24px}.toast-content h4{color:var(--text-main);margin:0 0 4px;font-size:16px}.toast-content p{color:var(--text-muted);margin:0;font-size:14px}@media (width<=1024px){.lesson-page-layout{grid-template-columns:1fr}.lesson-sidebar{position:static}}@media (width<=768px){.lesson-header-flex{flex-direction:column}.lesson-primary-actions{width:100%}.btn-mark-complete,.btn-next-lesson,.btn-quiz{flex:1;justify-content:center}}.course-learning-wrapper{background:var(--background);min-height:100vh;padding:var(--g-x) 0}.course-learning-container{gap:var(--g-x);max-width:1400px;padding:0 var(--g-x);animation:slideUp var(--trans) var(--ease);grid-template-columns:1fr 320px;margin:0 auto;display:grid}.course-learning-main{gap:var(--g-x);flex-direction:column;display:flex}.course-learning-header{background:var(--surface);border-radius:var(--radius-lg);padding:var(--g-x);box-shadow:var(--shadow-md);border:1px solid var(--border)}.header-top{justify-content:space-between;align-items:flex-start;gap:var(--g-x);display:flex}.course-title{font-size:var(--fs-xxl);color:var(--text-main);margin:0 0 var(--g) 0;background:linear-gradient(135deg, var(--primary) 0%, var(--primary-600) 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-weight:800;line-height:1.2}.course-description{color:var(--text-muted);font-size:var(--fs-base);margin:0;line-height:1.6}.header-stats{gap:var(--g);align-items:center;display:flex}.stat-badge{background:var(--primary-light);color:var(--primary);border-radius:var(--radius-md);font-size:var(--fs-sm);border:1px solid var(--primary);padding:8px 16px;font-weight:600}.lessons-list{gap:var(--g);flex-direction:column;display:flex}.lessons-list-header{margin-bottom:var(--g);justify-content:space-between;align-items:center;display:flex}.lessons-list h2{font-size:var(--fs-lg);color:var(--text-main);align-items:center;gap:var(--g);margin:0;font-weight:700;display:flex}.lessons-list h2:before{content:"";background:linear-gradient(180deg, var(--primary) 0%, var(--primary-600) 100%);border-radius:2px;width:4px;height:24px}.lessons-count-info{font-size:var(--fs-sm);color:var(--primary);background:var(--primary-light);border-radius:var(--radius-md);padding:4px 12px;font-weight:600}.lessons-list-content{gap:var(--g);flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.empty-state{padding:60px var(--g-x);background:var(--surface);border-radius:var(--radius-lg);border:2px dashed var(--border);flex-direction:column;justify-content:center;align-items:center;display:flex}.empty-icon{margin-bottom:var(--g-x);opacity:.5;font-size:64px}.empty-state p{color:var(--text-muted);font-size:var(--fs-base);margin:0}.lesson-item{gap:var(--g) var(--g-x);padding:var(--g-x);background:var(--surface);border:2px solid var(--border);border-radius:var(--radius-md);cursor:pointer;transition:all var(--trans) var(--ease);animation:slideUp var(--trans) var(--ease);border-left:4px solid #0000;grid-template-rows:auto auto auto;grid-template-columns:auto 1fr auto;align-items:start;display:grid;position:relative;overflow:hidden}.lesson-item:before{content:"";pointer-events:none;border-radius:var(--radius-md);background:linear-gradient(135deg,#0066ff05 0%,#0000 100%);position:absolute;inset:0}.lesson-item-icon{background:var(--primary-light);border-radius:var(--radius-md);width:52px;height:52px;color:var(--primary);transition:all var(--trans) var(--ease);z-index:2;border:2px solid #0000;grid-area:1/1/3/2;justify-content:center;align-items:center;font-size:20px;display:flex;position:relative}.icon-inner{justify-content:center;align-items:center;width:100%;height:100%;display:flex}.lesson-header-info{justify-content:space-between;align-items:flex-start;gap:var(--g);margin-bottom:var(--g-sm);display:flex}.lesson-item-content{z-index:2;flex-direction:column;grid-area:1/2/3/3;gap:8px;display:flex;position:relative}.lesson-item-content a{text-decoration:none!important}.lesson-item-title{font-size:var(--fs-base);color:var(--text-main);transition:color var(--trans) var(--ease);margin:0;font-weight:600;line-height:1.4}.lesson-item-duration{font-size:var(--fs-sm);color:var(--text-muted);transition:color var(--trans) var(--ease);margin:0}.lesson-badges{gap:var(--g-sm);flex-wrap:wrap;display:flex}.difficulty-badge{border-radius:var(--radius-sm);text-transform:uppercase;letter-spacing:.5px;background:0 0;border:1.5px solid;padding:4px 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