:root{--primary: #4361ee;--primary-dark: #3a56d4;--primary-light: #eef2ff;--secondary: #6c757d;--success: #4cc9f0;--success-light: #e6f7fd;--danger: #f72585;--danger-light: #fde8f0;--warning: #ff9e00;--light: #f8f9fa;--dark: #212529;--gray: #6c757d;--gray-light: #e9ecef;--border-radius: 12px;--border-radius-sm: 8px;--shadow: 0 4px 20px rgba(0, 0, 0, .08);--shadow-lg: 0 10px 30px rgba(0, 0, 0, .12);--transition: all .3s ease}*{margin:0;padding:0;box-sizing:border-box;font-family:Inter,Segoe UI,Tahoma,Geneva,Verdana,sans-serif}body{background:linear-gradient(135deg,#f5f7fa,#e4e8f0);color:var(--dark);min-height:100vh;line-height:1.6;padding:20px}.app-container{max-width:900px;margin:0 auto}.header{text-align:center;margin-bottom:40px;padding-top:20px}h1{color:var(--primary);font-weight:700;font-size:2.5rem;margin-bottom:10px}.subtitle{color:var(--gray);font-size:1.1rem;max-width:600px;margin:0 auto}.converter-card{background-color:#fff;border-radius:var(--border-radius);box-shadow:var(--shadow-lg);padding:30px;margin-bottom:40px;transition:var(--transition)}.converter-card:hover{box-shadow:0 15px 35px #00000026}.input-section{margin-bottom:30px}.input-group{margin-bottom:25px}label{display:block;margin-bottom:8px;font-weight:600;color:var(--dark);font-size:1rem}input[type=text]{width:100%;padding:16px 18px;border:2px solid var(--gray-light);border-radius:var(--border-radius-sm);font-size:16px;transition:var(--transition);background-color:var(--light)}input[type=text]:focus{outline:none;border-color:var(--primary);background-color:#fff;box-shadow:0 0 0 3px #4361ee33}.input-hint{font-size:.85rem;color:var(--gray);margin-top:6px}.button-group{display:flex;gap:15px}.btn{flex:1;padding:16px 20px;border:none;border-radius:var(--border-radius-sm);font-size:16px;font-weight:600;cursor:pointer;transition:var(--transition);display:flex;align-items:center;justify-content:center;gap:8px}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:var(--primary-dark);transform:translateY(-2px);box-shadow:0 6px 15px #4361ee4d}.btn-secondary{background-color:var(--gray-light);color:var(--gray)}.btn-secondary:hover:not(:disabled){background-color:#d1d5db;color:var(--dark)}.btn:disabled{cursor:not-allowed;opacity:.6;transform:none!important;box-shadow:none!important}.btn-icon{font-size:18px}.progress-section{margin-bottom:20px;display:block}.progress-info{display:flex;justify-content:space-between;margin-bottom:10px}.progress-label{font-weight:600;color:var(--dark)}.progress-percent{font-weight:700;color:var(--primary)}.progress-bar{width:100%;height:12px;background-color:var(--gray-light);border-radius:10px;overflow:hidden;margin-bottom:12px}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--success));border-radius:10px;width:0%;transition:width .5s ease;position:relative}.progress-fill:after{content:"";position:absolute;inset:0;background-image:linear-gradient(-45deg,rgba(255,255,255,.2) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.2) 50%,rgba(255,255,255,.2) 75%,transparent 75%,transparent);background-size:20px 20px;animation:move 1s linear infinite;display:none}@keyframes move{0%{background-position:0 0}to{background-position:20px 0}}.progress-section.active .progress-fill:after{display:block}.status{text-align:center;font-size:14px;color:var(--gray);min-height:20px}.message-container{min-height:60px}.message{padding:16px 20px;border-radius:var(--border-radius-sm);text-align:center;font-weight:500;display:none}.message.success{background-color:var(--success-light);color:#0d6efd;border:1px solid rgba(76,201,240,.5);display:block}.message.error{background-color:var(--danger-light);color:var(--danger);border:1px solid rgba(247,37,133,.3);display:block}.message.warning{background-color:#fff3cd;color:#856404;border:1px solid #ffeaa7;display:block}.info-section{margin-bottom:40px}.info-section h2{text-align:center;margin-bottom:30px;color:var(--dark);font-weight:600}.info-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:25px}.info-card{background-color:#fff;border-radius:var(--border-radius);padding:25px;box-shadow:var(--shadow);text-align:center;transition:var(--transition)}.info-card:hover{transform:translateY(-5px);box-shadow:0 12px 25px #0000001a}.info-icon{width:50px;height:50px;background:linear-gradient(135deg,var(--primary),var(--success));color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 15px;font-weight:700;font-size:1.2rem}.info-card h3{margin-bottom:10px;color:var(--dark)}.info-card p{color:var(--gray);font-size:.95rem}.footer{text-align:center;padding:20px;color:var(--gray);font-size:.9rem;border-top:1px solid var(--gray-light)}@keyframes pulse{0%{opacity:1}50%{opacity:.7}to{opacity:1}}.pulse{animation:pulse 1.5s infinite}@media(max-width:768px){.app-container{padding:0 10px}h1{font-size:2rem}.converter-card{padding:20px}.button-group{flex-direction:column}.info-cards{grid-template-columns:1fr}}.message{padding:0;border-radius:var(--border-radius-sm);text-align:center;font-weight:500;display:none;background-color:var(--success-light);border:1px solid rgba(76,201,240,.3);overflow:hidden}.message.active{display:block;animation:slideDown .5s ease-out}@keyframes slideDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.message .success{background:linear-gradient(135deg,var(--success),var(--primary));color:#fff;padding:20px;margin:0}.message .success strong{font-size:1.2rem;display:block;margin-bottom:8px}.message .success br{display:none}.message .success:after{content:"Size: 19.12 MB";display:none;font-size:.9rem;opacity:.9;font-weight:500}.download-link{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;text-decoration:none;padding:12px 24px;border-radius:var(--border-radius-sm);font-weight:600;margin:20px auto;transition:var(--transition);box-shadow:0 4px 12px #4361ee4d}.download-link:hover{transform:translateY(-2px);box-shadow:0 6px 20px #4361ee66;color:#fff}.download-link:active{transform:translateY(0)}.message>div:last-child{padding:0 20px 20px}.message video{width:100%;max-width:600px;border-radius:8px;box-shadow:0 4px 15px #0000001a;border:3px solid white;background:var(--dark)}@media(max-width:768px){.message .success{padding:15px}.message .success strong{font-size:1.1rem}.download-link{padding:10px 20px;font-size:.9rem}.message>div:last-child{padding:0 15px 15px}.message video{max-width:100%}}@keyframes successPulse{0%{box-shadow:0 0 #4cc9f066}70%{box-shadow:0 0 0 10px #4cc9f000}to{box-shadow:0 0 #4cc9f000}}.message{animation:successPulse 2s ease-in-out}.message video:not([src]){background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0,#f0f0f0 75%);background-size:200% 100%;animation:loading 1.5s infinite}@keyframes loading{0%{background-position:200% 0}to{background-position:-200% 0}}.time-range-section{margin:20px 0;padding:15px;background:#f8f9fa;border-radius:8px;border:1px solid #e9ecef}.time-input-group{display:flex;gap:15px;margin-bottom:8px}.time-input{flex:1}.time-input label{display:block;margin-bottom:5px;font-weight:500;color:#495057;font-size:14px}.time-input input{width:100%;padding:10px 12px;border:1px solid #ddd;border-radius:6px;font-size:14px;transition:border-color .2s}.time-input input:focus{outline:none;border-color:#007bff;box-shadow:0 0 0 2px #007bff40}.display-none{display:none!important}.starting{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#ffffffb3;transition:.3s all;padding:20px;font-size:2rem;font-weight:700;text-align:center;display:flex;justify-content:center;align-items:center}.starting img{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.container{padding:20px;max-width:900px;margin:0 auto}.container p{margin:20px 0}