:root{--primary-color: #0ea5e9;--primary-dark: #0284c7;--primary-light: #38bdf8;--accent-color: #06b6d4;--success-color: #10b981;--warning-color: #f59e0b;--error-color: #ef4444;--text-primary: #0f172a;--text-secondary: #475569;--text-light: #94a3b8;--bg-primary: #ffffff;--bg-secondary: #f8fafc;--border-color: #e2e8f0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;line-height:1.6;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{margin:0;padding:0;box-sizing:border-box}body{margin:0;min-height:100vh;background:linear-gradient(135deg,#0ea5e9,#06b6d4,#10b981);color:var(--text-primary)}#root{width:100%;min-height:100vh}a{font-weight:500;color:var(--primary-color);text-decoration:none;transition:color .3s 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h2{margin:0;font-size:1.75rem;flex:1;text-align:center;color:#fff;font-weight:700;letter-spacing:-.5px}.btn-back{padding:.625rem 1.25rem;background:#334155cc;color:#f1f5f9;border:1px solid rgba(148,163,184,.2);border-radius:8px;cursor:pointer;font-size:.95rem;font-weight:500;transition:all .2s}.btn-back:hover{background:#475569e6;border-color:#94a3b866;transform:translate(-2px)}.export-controls{display:flex;gap:1.5rem;align-items:center}.style-selector{display:flex;flex-direction:column;gap:.5rem}.style-selector label{font-size:.875rem;color:#cbd5e1;font-weight:500}.style-select{padding:.625rem 1rem;background:#334155cc;color:#f1f5f9;border:1px solid rgba(148,163,184,.2);border-radius:8px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s;min-width:200px}.style-select:hover{background:#475569e6;border-color:#94a3b866}.style-select:focus{outline:none;border-color:#10b981;box-shadow:0 0 0 3px #10b9811a}.btn-export{padding:.75rem 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#0000004d;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.login-header{text-align:center;margin-bottom:2.5rem}.login-header h1{font-size:4rem;margin:0 0 1rem}.login-header h2{font-size:1.75rem;margin:0 0 .5rem;color:#2d3748;font-weight:700}.login-header p{color:#718096;font-size:.95rem;margin:0}.login-form{display:flex;flex-direction:column;gap:1.5rem}.error-message{background:#ef44441a;color:#dc2626;padding:.875rem 1rem;border-radius:8px;border:1px solid rgba(239,68,68,.2);font-size:.875rem;text-align:center}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-group label{font-size:.875rem;font-weight:600;color:#4a5568}.form-group input{padding:.875rem 1rem;border:2px solid #e2e8f0;border-radius:10px;font-size:1rem;transition:all .2s;background:#fff}.form-group input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.form-group 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2rem;gap:1.5rem;background:#ffffff1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.1)}.welcome-text{color:#fff;font-weight:600;font-size:1rem}.logout-button{padding:.5rem 1.25rem;background:#ef4444e6;color:#fff;border:none;border-radius:8px;font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s}.logout-button:hover{background:#dc2626;transform:translateY(-2px);box-shadow:0 4px 12px #ef444466}.logout-button:active{transform:translateY(0)}header{text-align:center;margin-bottom:3rem;animation:fadeInDown .6s ease}header h1{font-size:3.5rem;margin-bottom:.8rem;color:#fff;text-shadow:0 4px 20px rgba(0,0,0,.15);font-weight:800;letter-spacing:-1px}header p{color:#fffffff2;font-size:1.25rem;font-weight:400}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.upload-section,.process-section,.progress-section,.video-list-section{background:#fff;border-radius:16px;padding:2.5rem;margin-bottom:2rem;box-shadow:0 10px 40px #00000014;animation:fadeInUp .6s ease;transition:transform .3s ease,box-shadow .3s ease}.upload-section:hover,.process-section:hover,.video-list-section:hover{transform:translateY(-2px);box-shadow:0 15px 50px #0000001f}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.upload-section h2,.process-section h2,.progress-section h2,.video-list-section h2{font-size:1.75rem;margin-bottom:1.5rem;color:var(--text-primary)}.file-input-wrapper{margin:1.5rem 0}.file-input-wrapper input[type=file]{width:100%;padding:1rem;border:2px dashed var(--border-color);border-radius:12px;background:var(--bg-secondary);cursor:pointer;transition:all .3s ease}.file-input-wrapper input[type=file]:hover{border-color:var(--primary-color);background:#fff}.file-input-wrapper p{margin-top:.75rem;color:var(--text-secondary);font-size:.95rem}.form-group{margin:1.5rem 0}.form-group label{display:block;margin-bottom:.5rem;font-weight:600;color:var(--text-primary);font-size:.95rem}.form-group input,.form-group select,.form-group textarea{width:100%;padding:.875rem 1rem;font-size:1rem;border:2px solid var(--border-color);border-radius:8px;background:#fff;transition:all .3s ease;font-family:inherit}.form-group textarea{resize:vertical;min-height:80px}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #0ea5e91a}.form-hint{display:block;margin-top:.5rem;color:var(--text-secondary);font-size:.875rem;line-height:1.4}.btn-primary,.btn-secondary,.btn-download{padding:.875rem 2rem;font-size:1rem;font-weight:600;border:none;border-radius:10px;cursor:pointer;margin:.5rem;transition:all .3s ease;box-shadow:0 2px 8px #00000014}.btn-primary{background:linear-gradient(135deg,var(--primary-color),var(--accent-color));color:#fff}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #0ea5e94d}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-primary:disabled{background:#cbd5e1;cursor:not-allowed;transform:none;box-shadow:none}.btn-secondary{background:#fff;color:var(--text-primary);border:2px solid var(--border-color)}.btn-secondary:hover{border-color:var(--primary-color);color:var(--primary-color)}.btn-download{background:linear-gradient(135deg,var(--success-color),#059669);color:#fff;width:100%}.btn-download:hover{transform:translateY(-2px);box-shadow:0 6px 20px #10b9814d}.button-group{display:flex;justify-content:center;gap:1rem;margin-top:2rem;flex-wrap:wrap}.progress-bar{width:100%;height:12px;background:var(--bg-secondary);border-radius:999px;overflow:hidden;margin:1.5rem 0;box-shadow:inset 0 2px 4px #0000000f}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary-color),var(--accent-color));transition:width .4s cubic-bezier(.4,0,.2,1);box-shadow:0 0 10px #0ea5e980}.progress-text{font-size:1.5rem;font-weight:700;margin:1rem 0 .5rem;color:var(--primary-color)}.progress-message{color:var(--text-secondary);font-size:1rem}.result-summary{margin:1.5rem 0 2rem;padding:1.5rem;background:linear-gradient(135deg,#0ea5e91a,#10b9811a);border-radius:12px;border-left:4px solid var(--primary-color)}.result-summary p{margin:.5rem 0;font-size:1.1rem;color:var(--text-primary)}.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem;margin:2rem 0}.video-card{background:var(--bg-secondary);padding:1.75rem;border-radius:12px;border:2px solid var(--border-color);transition:all .3s ease}.video-card:hover{border-color:var(--primary-color);transform:translateY(-4px);box-shadow:0 12px 24px #0ea5e926}.video-card h3{margin:0 0 .75rem;font-size:1.25rem;color:var(--text-primary)}.video-card p{margin:0 0 1rem;color:var(--text-secondary);font-size:.9rem;word-break:break-all}.error-message{background:linear-gradient(135deg,#fee2e2,#fecaca);color:#991b1b;padding:1rem 1.5rem;border-radius:10px;margin:1rem 0;border-left:4px solid var(--error-color);font-weight:500}@media (max-width: 768px){.App{padding:2rem 1rem}header h1{font-size:2.5rem}header p{font-size:1.1rem}.upload-section,.process-section,.progress-section,.video-list-section{padding:1.5rem}.video-grid{grid-template-columns:1fr}.button-group{flex-direction:column}.btn-primary,.btn-secondary{width:100%}}