:root{--bg-color: #f8f9fa;--text-color: #2c3e50;--card-bg: #ffffff;--card-shadow: rgba(0, 0, 0, .08);--border-color: #e9ecef;--select-bg: #ffffff;--select-border: #ced4da;--label-color: #495057;--accent-color: #3498db;--accent-hover: #2980b9;--success-color: #27ae60;--warning-color: #f39c12;--danger-color: #e74c3c;--card-radius: 16px;--transition-speed: .3s;--section-radius: 12px}[data-theme=dark]{--bg-color: #1a1a1a;--text-color: #e0e0e0;--card-bg: #2d2d2d;--card-shadow: rgba(0, 0, 0, .3);--border-color: #404040;--select-bg: #2d2d2d;--select-border: #404040;--label-color: #e0e0e0;--accent-color: #60a5fa;--accent-hover: #3b82f6;--success-color: #10b981;--warning-color: #f59e0b;--danger-color: #ef4444}*{box-sizing:border-box}body{background-color:var(--bg-color);color:var(--text-color);transition:background-color var(--transition-speed),color var(--transition-speed);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;margin:0;padding:0}.container{max-width:1400px;margin:0 auto;padding:2rem}.header-container{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:2rem;padding:2rem;background:linear-gradient(135deg,var(--card-bg) 0%,rgba(255,255,255,.05) 100%);border-radius:var(--card-radius);box-shadow:0 4px 20px var(--card-shadow);border:1px solid var(--border-color)}.header-left h1{margin:0 0 .5rem;font-size:2.5rem;font-weight:700;color:var(--text-color);display:flex;align-items:center;gap:.75rem}.header-left .subtitle{margin:0;color:var(--label-color);font-size:1.1rem;font-weight:400}.header-controls{display:flex;gap:1.5rem;align-items:flex-end}.control-group{display:flex;flex-direction:column;align-items:center;gap:.5rem}.control-label{font-size:.875rem;font-weight:600;color:var(--label-color);text-transform:uppercase;letter-spacing:.5px}.mode-toggle,.theme-toggle{background:var(--card-bg);border:2px solid var(--border-color);cursor:pointer;font-size:1.25rem;padding:.75rem;border-radius:50%;width:48px;height:48px;display:flex;align-items:center;justify-content:center;transition:all var(--transition-speed);color:var(--text-color)}.mode-toggle:hover,.theme-toggle:hover{background-color:var(--accent-color);border-color:var(--accent-color);color:#fff;transform:translateY(-2px);box-shadow:0 4px 12px #3498db4d}[data-mode=study] .view-icon,[data-mode=view] .study-icon,[data-theme=light] .dark-icon,[data-theme=dark] .light-icon{display:none}.selection-panel{background:var(--card-bg);border-radius:var(--card-radius);box-shadow:0 4px 20px var(--card-shadow);border:1px solid var(--border-color);margin-bottom:2rem;overflow:hidden}.selection-header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 2rem;background:linear-gradient(135deg,var(--accent-color) 0%,var(--accent-hover) 100%);color:#fff}.selection-header h2{margin:0;font-size:1.5rem;font-weight:600;display:flex;align-items:center;gap:.75rem}.clear-btn{background:#fff3;border:1px solid rgba(255,255,255,.3);color:#fff;padding:.5rem 1rem;border-radius:8px;cursor:pointer;font-size:.875rem;font-weight:500;transition:all var(--transition-speed);display:flex;align-items:center;gap:.5rem}.clear-btn:hover{background:#ffffff4d;transform:translateY(-1px)}.selection-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;padding:2rem}.selection-card{background:var(--bg-color);border-radius:var(--section-radius);padding:1.5rem;border:2px solid var(--border-color);transition:all var(--transition-speed);position:relative}.selection-card:hover{border-color:var(--accent-color);transform:translateY(-2px);box-shadow:0 4px 12px var(--card-shadow)}.selection-card .card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.selection-card .card-header h3{margin:0;font-size:1.25rem;font-weight:600;color:var(--text-color);display:flex;align-items:center;gap:.5rem}.card-number{background:var(--accent-color);color:#fff;width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.875rem}.toggle-card-btn{background:var(--success-color);border:none;color:#fff;width:32px;height:32px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-speed)}.toggle-card-btn:hover{background:var(--accent-color);transform:scale(1.1)}.select-group{margin-bottom:1rem}.select-group:last-child{margin-bottom:0}.joint-select-group{margin-bottom:1rem}.select-group label{display:block;font-weight:600;color:var(--label-color);font-size:.875rem;margin-bottom:.5rem;text-transform:uppercase;letter-spacing:.5px}select{width:100%;padding:.75rem 2.5rem .75rem 1rem;border:2px solid var(--select-border);border-radius:8px;font-size:1rem;background-color:var(--select-bg);color:var(--text-color);transition:all var(--transition-speed);cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");background-position:right .5rem center;background-repeat:no-repeat;background-size:1.5em 1.5em}select:focus{border-color:var(--accent-color);outline:none;box-shadow:0 0 0 3px #3498db1a}.cards-container{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:start}.study-card{background:var(--card-bg);border-radius:var(--card-radius);box-shadow:0 4px 20px var(--card-shadow);border:1px solid var(--border-color);transition:all var(--transition-speed);overflow:hidden}.study-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px var(--card-shadow)}.study-card.collapsed{opacity:.6;transform:scale(.98)}.study-card.collapsed .card-content{display:none}.study-card .card-header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 2rem;background:linear-gradient(135deg,var(--card-bg) 0%,rgba(255,255,255,.05) 100%);border-bottom:1px solid var(--border-color)}.card-title h2{margin:0 0 .25rem;font-size:1.5rem;font-weight:700;color:var(--text-color)}.card-subtitle{font-size:.875rem;color:var(--label-color);font-weight:500}.card-controls{display:flex;gap:.5rem}.reveal-all-btn,.expand-btn{background:var(--card-bg);border:1px solid var(--border-color);color:var(--text-color);width:36px;height:36px;border-radius:8px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-speed);font-size:.875rem}.reveal-all-btn:hover,.expand-btn:hover{background:var(--accent-color);border-color:var(--accent-color);color:#fff;transform:translateY(-1px)}.card-content{padding:2rem}.dermatome-image-container{margin-bottom:2rem;border:1px solid var(--border-color);border-radius:var(--section-radius);overflow:hidden;background:var(--card-bg)}.image-header{padding:1rem 1.5rem;background:var(--bg-color);border-bottom:1px solid var(--border-color)}.image-header h3{margin:0;font-size:1.1rem;font-weight:600;color:var(--text-color);display:flex;align-items:center;gap:.5rem}.dermatome-image-container img{width:100%;height:auto;display:block;padding:1rem}.details-container{margin-bottom:2rem}.info-section{margin-bottom:1.5rem;border:1px solid var(--border-color);border-radius:var(--section-radius);overflow:hidden;transition:all var(--transition-speed)}.info-section:hover{border-color:var(--accent-color);box-shadow:0 2px 8px var(--card-shadow)}.info-section:last-child{margin-bottom:0}.section-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.5rem;background:var(--bg-color);border-bottom:1px solid var(--border-color)}.section-header h3{margin:0;font-size:1.1rem;font-weight:600;color:var(--text-color);display:flex;align-items:center;gap:.5rem}.section-toggle,.save-notes-btn{background:none;border:none;color:var(--accent-color);cursor:pointer;padding:.5rem;border-radius:6px;transition:all var(--transition-speed);font-size:1rem}.section-toggle:hover,.save-notes-btn:hover{background:var(--accent-color);color:#fff;transform:scale(1.1)}.section-content{padding:1.5rem;background:var(--card-bg);transition:all var(--transition-speed)}.section-content.hidden{display:none}.section-content p{margin:0;line-height:1.7;color:var(--text-color)}.notes-section{margin-top:2rem;border:2px solid var(--border-color);border-radius:var(--section-radius);overflow:hidden}.notes-section .section-header{background:linear-gradient(135deg,var(--success-color) 0%,#2ecc71 100%);color:#fff}.notes-section .section-header h3,.notes-section .save-notes-btn{color:#fff}.notes-section .save-notes-btn:hover{background:#fff3}.notes-input{width:100%;min-height:120px;padding:1.5rem;border:none;background:var(--card-bg);color:var(--text-color);font-family:inherit;font-size:1rem;line-height:1.6;resize:vertical;outline:none}.notes-input:focus{background:var(--bg-color)}[data-mode=study] .section-content{display:none}[data-mode=study] .section-content.hidden{display:block}[data-mode=study] .section-toggle{color:var(--success-color)}[data-mode=study] .section-toggle:hover{background:var(--success-color)}@media (max-width: 1200px){.cards-container,.selection-grid{grid-template-columns:1fr}}@media (max-width: 768px){.container{padding:1rem}.header-container{flex-direction:column;gap:1.5rem;align-items:stretch;padding:1.5rem}.header-left h1{font-size:2rem}.header-controls{justify-content:center}.selection-header{flex-direction:column;gap:1rem;text-align:center}.selection-grid{padding:1.5rem;gap:1.5rem}.study-card .card-header{flex-direction:column;gap:1rem;align-items:stretch}.card-controls{justify-content:center}.card-content{padding:1.5rem}.section-header{flex-direction:column;gap:.75rem;text-align:center}}@media (max-width: 480px){.header-left h1{font-size:1.75rem}.selection-card,.card-content,.section-content{padding:1rem}}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.study-card{animation:fadeIn .5s ease-out}button:focus,select:focus,textarea:focus{outline:2px solid var(--accent-color);outline-offset:2px}.loading{opacity:.6;pointer-events:none}.loading:after{content:"";position:absolute;top:50%;left:50%;width:20px;height:20px;margin:-10px 0 0 -10px;border:2px solid var(--accent-color);border-top:2px solid transparent;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.video-section{margin-top:1.5rem;border:2px solid var(--border-color);border-radius:var(--section-radius);overflow:hidden}.video-header{background:linear-gradient(135deg,var(--accent-color) 0%,#667eea 100%);color:#fff;padding:1rem 1.5rem;display:flex;justify-content:space-between;align-items:center}.video-header h4{margin:0;font-size:1.1rem;font-weight:600}.upload-video-btn{background:#fff3;color:#fff;border:1px solid rgba(255,255,255,.3);padding:.5rem 1rem;border-radius:6px;cursor:pointer;font-size:.9rem;transition:all var(--transition-speed);display:flex;align-items:center;gap:.5rem}.upload-video-btn:hover{background:#ffffff4d;transform:translateY(-1px)}.video-upload-area{padding:1.5rem;background:var(--card-bg)}.upload-zone{border:2px dashed var(--border-color);border-radius:8px;padding:2rem;text-align:center;cursor:pointer;transition:all var(--transition-speed);background:var(--bg-color)}.upload-zone:hover{border-color:var(--accent-color);background:#667eea0d}.upload-zone.dragover{border-color:var(--accent-color);background:#667eea1a;transform:scale(1.02)}.upload-zone i{font-size:3rem;color:var(--accent-color);margin-bottom:1rem}.upload-zone p{margin:0;color:var(--text-color);font-size:1rem}.upload-progress{margin-top:1rem;display:flex;align-items:center;gap:1rem}.progress-bar{flex:1;height:8px;background:var(--border-color);border-radius:4px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent-color),#667eea);width:0%;transition:width .3s ease}.progress-text{font-size:.9rem;color:var(--text-color);min-width:40px}.videos-container{padding:1.5rem;background:var(--card-bg)}.video-item{display:flex;align-items:center;gap:1rem;padding:1rem;border:1px solid var(--border-color);border-radius:8px;margin-bottom:1rem;background:var(--bg-color);transition:all var(--transition-speed)}.video-item:hover{border-color:var(--accent-color);box-shadow:0 2px 8px #667eea1a}.video-thumbnail{width:120px;height:67.5px;border-radius:6px;object-fit:cover;cursor:pointer;transition:transform .2s ease}.video-thumbnail:hover{transform:scale(1.05)}.video-info{flex:1;min-width:0}.video-title{font-weight:600;color:var(--text-color);margin-bottom:.5rem;font-size:.95rem}.video-meta{display:flex;gap:1rem;font-size:.85rem;color:var(--text-muted);margin-bottom:.5rem}.video-description{font-size:.9rem;color:var(--text-color);line-height:1.4}.video-actions{display:flex;gap:.5rem}.video-action-btn{background:none;border:1px solid var(--border-color);padding:.5rem;border-radius:4px;cursor:pointer;color:var(--text-color);transition:all var(--transition-speed);font-size:.9rem}.video-action-btn:hover{background:var(--accent-color);color:#fff;border-color:var(--accent-color)}.video-action-btn.delete{color:var(--danger-color);border-color:var(--danger-color)}.video-action-btn.delete:hover{background:var(--danger-color);color:#fff}.video-modal{display:none;position:fixed;z-index:1000;left:0;top:0;width:100%;height:100%;background:#000c;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.video-modal.show{display:flex;align-items:center;justify-content:center}.video-modal-content{background:var(--card-bg);border-radius:12px;width:90%;max-width:800px;max-height:90vh;overflow:hidden;box-shadow:0 20px 40px #0000004d;animation:modalSlideIn .3s ease-out}@keyframes modalSlideIn{0%{opacity:0;transform:scale(.9) translateY(-20px)}to{opacity:1;transform:scale(1) translateY(0)}}.video-modal-header{background:linear-gradient(135deg,var(--accent-color) 0%,#667eea 100%);color:#fff;padding:1.5rem;display:flex;justify-content:space-between;align-items:center}.video-modal-header h3{margin:0;font-size:1.3rem}.close-modal-btn{background:#fff3;border:none;color:#fff;padding:.5rem;border-radius:6px;cursor:pointer;font-size:1.1rem;transition:all var(--transition-speed)}.close-modal-btn:hover{background:#ffffff4d;transform:scale(1.1)}.video-modal-body{padding:1.5rem}#videoPlayer{width:100%;border-radius:8px;margin-bottom:1.5rem}.video-info{display:grid;grid-template-columns:1fr auto;gap:1.5rem;align-items:start}.video-description{display:flex;flex-direction:column;gap:.75rem}.video-description label{font-weight:600;color:var(--text-color);font-size:.95rem}#videoDescription{width:100%;min-height:80px;padding:.75rem;border:1px solid var(--border-color);border-radius:6px;background:var(--bg-color);color:var(--text-color);font-family:inherit;font-size:.9rem;resize:vertical;outline:none}#videoDescription:focus{border-color:var(--accent-color)}.save-desc-btn{background:var(--success-color);color:#fff;border:none;padding:.75rem 1rem;border-radius:6px;cursor:pointer;font-size:.9rem;transition:all var(--transition-speed);display:flex;align-items:center;gap:.5rem;align-self:flex-start}.save-desc-btn:hover{background:#27ae60;transform:translateY(-1px)}.video-actions{display:flex;flex-direction:column;gap:.75rem}.delete-video-btn{background:var(--danger-color);color:#fff;border:none;padding:.75rem 1rem;border-radius:6px;cursor:pointer;font-size:.9rem;transition:all var(--transition-speed);display:flex;align-items:center;gap:.5rem}.delete-video-btn:hover{background:#c0392b;transform:translateY(-1px)}@media (max-width: 768px){.video-modal-content{width:95%;margin:1rem}.video-modal-header,.video-modal-body{padding:1rem}.video-info{grid-template-columns:1fr;gap:1rem}.video-item{flex-direction:column;align-items:stretch;text-align:center}.video-thumbnail{width:100%;height:auto;max-height:150px}.video-actions{justify-content:center}}