:root{--primary-color: #007bff;--secondary-color: #6c757d;--success-color: #28a745;--danger-color: #dc3545;--warning-color: #ffc107;--info-color: #17a2b8}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;min-height:100vh;display:flex;flex-direction:column}main{flex:1}.dashboard-card{transition:transform .3s ease,box-shadow .3s ease;border:none;border-radius:15px;overflow:hidden}.dashboard-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px #00000026}.video-container{position:relative;width:100%;max-width:640px;margin:0 auto;border-radius:15px;overflow:hidden;box-shadow:0 5px 20px #0003}#video-preview,#recorded-video{width:100%;height:auto;background-color:#000}.video-controls{position:absolute;bottom:20px;left:50%;transform:translate(-50%);display:flex;gap:15px;z-index:10}.video-controls button{width:60px;height:60px;border-radius:50%;border:none;background-color:#ffffffe6;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;font-size:24px}.video-controls button:hover{transform:scale(1.1);background-color:#fff}.video-controls button.recording{background-color:var(--danger-color);color:#fff;animation:pulse 1.5s infinite}@keyframes pulse{0%{box-shadow:0 0 #dc3545b3}70%{box-shadow:0 0 0 20px #dc354500}to{box-shadow:0 0 #dc354500}}.chat-container{height:calc(100vh - 200px);display:flex;flex-direction:column;background-color:#f8f9fa;border-radius:15px;overflow:hidden;box-shadow:0 5px 20px #0000001a}.chat-messages{flex:1;overflow-y:auto;padding:20px}.message{display:flex;margin-bottom:20px;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message.sent{justify-content:flex-end}.message.received{justify-content:flex-start}.message-content{max-width:70%;padding:12px 18px;border-radius:20px;position:relative}.message.sent .message-content{background-color:var(--primary-color);color:#fff;border-bottom-right-radius:5px}.message.received .message-content{background-color:#fff;color:#333;border-bottom-left-radius:5px;box-shadow:0 2px 5px #0000001a}.message-time{font-size:.75rem;margin-top:5px;opacity:.7}.message.sent .message-time{text-align:right}.sign-video-player{position:relative;width:100%;max-width:480px;margin:10px 0;border-radius:10px;overflow:hidden}.sign-video-player video{width:100%;height:auto}.sign-video-overlay{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(transparent,#000000b3);padding:20px;color:#fff;opacity:0;transition:opacity .3s ease}.sign-video-player:hover .sign-video-overlay{opacity:1}.user-list{background-color:#fff;border-radius:15px;overflow:hidden;box-shadow:0 5px 15px #0000001a}.user-item{display:flex;align-items:center;padding:15px 20px;border-bottom:1px solid #eee;transition:background-color .3s ease;cursor:pointer}.user-item:hover{background-color:#f8f9fa}.user-item.active{background-color:#e3f2fd;border-left:4px solid var(--primary-color)}.user-avatar{width:50px;height:50px;border-radius:50%;background-color:var(--primary-color);display:flex;align-items:center;justify-content:center;color:#fff;font-size:24px;margin-right:15px}.user-info h6{margin:0;font-weight:600}.user-info small{color:#999}.stats-card{background:linear-gradient(135deg,var(--primary-color),#0056b3);color:#fff;border-radius:15px;padding:25px;margin-bottom:20px}.stats-card i{font-size:48px;opacity:.8}.stats-card .stat-number{font-size:36px;font-weight:700;margin:10px 0 5px}.stats-card .stat-label{font-size:16px;opacity:.9}.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;padding:20px 0}.video-card{background:#fff;border-radius:15px;overflow:hidden;box-shadow:0 5px 15px #0000001a;transition:transform .3s ease}.video-card:hover{transform:translateY(-5px);box-shadow:0 10px 25px #00000026}.video-thumbnail{position:relative;padding-top:56.25%;background-color:#000}.video-thumbnail img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}.video-info{padding:15px}.video-info h5{margin:0 0 10px;font-size:18px}.video-info .sign-word{display:inline-block;padding:5px 10px;background-color:var(--primary-color);color:#fff;border-radius:20px;font-size:14px}@media(max-width:768px){.video-controls button{width:50px;height:50px;font-size:20px}.message-content{max-width:85%}.stats-card{padding:20px}.stats-card i{font-size:36px}.stats-card .stat-number{font-size:28px}}.spinner-overlay{position:fixed;inset:0;background-color:#fffc;display:flex;align-items:center;justify-content:center;z-index:9999}.spinner{width:50px;height:50px;border:5px solid #f3f3f3;border-top:5px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.auth-form{max-width:400px;margin:50px auto;padding:30px;background:#fff;border-radius:15px;box-shadow:0 5px 30px #0000001a}.auth-form h2{text-align:center;margin-bottom:30px;color:var(--primary-color)}.notification-badge{position:relative}.notification-badge[data-count]:after{content:attr(data-count);position:absolute;top:-5px;right:-5px;background-color:var(--danger-color);color:#fff;font-size:12px;padding:2px 6px;border-radius:50%;min-width:20px;text-align:center}