:root{--primary:#6366f1;--primary-dark:#4f46e5;--primary-light:#eef2ff;--success:#10b981;--success-light:#d1fae5;--error:#ef4444;--error-light:#fee2e2;--text-primary:#1f2937;--text-secondary:#4b5563;--text-muted:#9ca3af;--border:#e5e7eb;--background:#fff;--background-alt:#f9fafb;--shadow:0 10px 25px -5px #0000001a, 0 8px 10px -6px #0000001a;--shadow-lg:0 20px 25px -5px #00000026, 0 10px 10px -5px #0000000a;--radius:16px;--radius-sm:8px;--navigation-bg:#ffffff26;--transition:all .2s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0}body{color:var(--text-primary);background:linear-gradient(135deg,#4f46e5 0%,#7c3aed 50%,#c084fc 100%);flex-direction:column;justify-content:flex-start;align-items:center;min-height:100vh;padding:20px;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;display:flex}#root{justify-content:center;width:100%;display:flex}.container{flex-direction:column;gap:24px;width:100%;max-width:600px;padding:20px 0;display:flex}.app-header{text-align:center;color:#fff;text-shadow:0 2px 4px #0000001a}.app-title{letter-spacing:-.5px;justify-content:center;align-items:center;gap:10px;margin-bottom:4px;font-size:28px;font-weight:800;display:flex}.app-subtitle{color:#fffc;font-size:14px;font-weight:400}.main-nav{background:var(--navigation-bg);-webkit-backdrop-filter:blur(20px);border-radius:var(--radius);border:1px solid #ffffff40;grid-template-columns:repeat(5,1fr);width:100%;padding:6px;display:grid;box-shadow:0 8px 32px #0000001a}.nav-button{color:#ffffffe6;cursor:pointer;transition:var(--transition);text-align:center;background:0 0;border:none;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;gap:6px;padding:12px 6px;font-family:Inter,sans-serif;font-size:12px;font-weight:600;display:flex}.nav-button svg{width:18px;height:18px}.nav-button:hover{color:#fff;background:#ffffff1f}.nav-button.active{background:var(--background);color:var(--primary-dark);box-shadow:0 4px 12px #0000001f}.card{background:var(--background);border-radius:var(--radius);box-shadow:var(--shadow-lg);border:1px solid #fff9;flex-direction:column;gap:20px;padding:32px;animation:.4s ease-out fadeIn;display:flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.tab-title{color:var(--text-primary);align-items:center;gap:8px;margin-bottom:4px;font-size:20px;font-weight:700;display:flex}.tab-description{color:var(--text-secondary);font-size:13.5px}.dropzone{border:2.5px dashed var(--border);border-radius:var(--radius);text-align:center;background:var(--background-alt);cursor:pointer;transition:var(--transition);flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:36px 16px;display:flex}.dropzone:hover,.dropzone.active{border-color:var(--primary);background:var(--primary-light)}.dropzone-icon{color:var(--primary);background:#6366f11a;border-radius:50%;justify-content:center;align-items:center;padding:12px;display:flex}.dropzone-text{color:var(--text-secondary);font-size:14px;font-weight:500}.dropzone-hint{color:var(--text-muted);font-size:11px}.file-list{flex-direction:column;gap:10px;margin-top:10px;display:flex}.file-item{background:var(--background-alt);border:1px solid var(--border);border-radius:var(--radius-sm);transition:var(--transition);justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.file-item:hover{border-color:var(--text-muted)}.file-info{align-items:center;gap:10px;display:flex;overflow:hidden}.file-name{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:500;overflow:hidden}.file-size{color:var(--text-muted);font-size:11px}.file-actions{align-items:center;gap:8px;display:flex}.action-btn{cursor:pointer;color:var(--text-secondary);transition:var(--transition);background:0 0;border:none;border-radius:6px;justify-content:center;align-items:center;padding:6px;display:inline-flex}.action-btn:hover{color:var(--error);background:#0000000d}.action-btn.move{cursor:grab}.options-panel{background:var(--background-alt);border-radius:var(--radius-sm);border:1px solid var(--border);flex-direction:column;gap:14px;padding:16px;display:flex}.option-group{flex-direction:column;gap:6px;display:flex}.option-label{color:var(--text-primary);font-size:13px;font-weight:600}.input-text{border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;transition:var(--transition);outline:none;padding:10px 12px;font-size:13px}.input-text:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6366f126}.select-box{border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;width:100%;transition:var(--transition);background:#fff;outline:none;padding:10px 12px;font-size:13px}.select-box:focus{border-color:var(--primary)}.conversion-grid{grid-template-columns:repeat(2,1fr);gap:10px;display:grid}.conversion-card{border:2px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);background:#fff;align-items:center;gap:10px;padding:12px;display:flex}.conversion-card:hover{border-color:var(--primary-dark)}.conversion-card.selected{border-color:var(--primary);background:var(--primary-light)}.conversion-icon{font-size:18px}.conversion-title{color:var(--text-primary);font-size:12px;font-weight:600}.submit-btn{background:var(--primary);color:#fff;cursor:pointer;width:100%;transition:var(--transition);border:none;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:14px;font-size:14px;font-weight:600;display:flex;box-shadow:0 4px 10px #6366f133}.submit-btn:hover{background:var(--primary-dark);box-shadow:0 4px 14px #4f46e559}.submit-btn:disabled{background:var(--text-muted);cursor:not-allowed;box-shadow:none}.status-banner{border-radius:var(--radius-sm);align-items:flex-start;gap:12px;padding:14px 16px;font-size:13px;animation:.3s ease-out fadeIn;display:flex}.status-banner.success{background:var(--success-light);color:#065f46;border:1px solid #a7f3d0}.status-banner.error{background:var(--error-light);color:#991b1b;border:1px solid #fca5a5}.status-icon{flex-shrink:0;margin-top:2px}.progress-display{width:100%;margin-top:10px}.progress-bar-container{background-color:var(--border);border-radius:var(--radius-sm);width:100%;overflow:hidden}.progress-bar-inner{background-color:var(--primary);width:0%;height:8px;transition:width .3s}.progress-text{color:var(--text-secondary);justify-content:space-between;margin-top:6px;font-size:12px;font-weight:500;display:flex}.progress-bar-indeterminate{background-color:var(--primary-light);border-radius:var(--radius-sm);width:100%;height:8px;position:relative;overflow:hidden}.progress-bar-indeterminate:before{content:"";background:var(--primary);width:50%;height:100%;animation:1.5s ease-in-out infinite indeterminate-progress;position:absolute;top:0;left:0}.footer{text-align:center;color:#fffc;justify-content:center;gap:4px;font-size:13px;display:flex}@media (width<=480px){body{padding:10px}.container{gap:16px}.main-nav{border-radius:12px;padding:4px}.nav-button{gap:4px;padding:8px 4px;font-size:10px}.nav-button svg{width:16px;height:16px}.card{padding:20px}.conversion-grid{grid-template-columns:1fr}}