:root{--primary: #0066CC;--primary-hover: #0052A3;--success: #00A651;--error: #E34850;--neutral-50: #F9FAFB;--neutral-100: #F3F4F6;--neutral-200: #E5E7EB;--neutral-700: #374151;--neutral-900: #111827}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--neutral-50);color:var(--neutral-700);font-size:16px;line-height:1.5}.app-container{min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:24px}.app-header{text-align:center;margin-bottom:48px;margin-top:24px}.app-header h1{font-size:32px;font-weight:600;color:var(--neutral-900);margin-bottom:8px}.app-header p{font-size:16px;color:var(--neutral-700)}.app-main{width:100%;max-width:640px;flex:1}.app-footer{margin-top:48px;text-align:center;color:var(--neutral-700);font-size:14px}.file-upload-container{margin-bottom:24px}.drop-zone{border:2px dashed var(--neutral-200);border-radius:12px;padding:48px 24px;background-color:#fff;cursor:pointer;transition:all .2s ease;min-height:400px;display:flex;align-items:center;justify-content:center}.drop-zone:hover{border-color:var(--primary);background-color:var(--neutral-50)}.drop-zone.dragging{border-color:var(--primary);background-color:var(--neutral-100);border-style:solid}.drop-zone-content{text-align:center}.upload-icon{color:var(--neutral-700);margin-bottom:16px}.drop-zone h3{font-size:20px;font-weight:500;color:var(--neutral-900);margin-bottom:8px}.drop-zone p{color:var(--neutral-700);margin-bottom:24px}.browse-button{background-color:var(--primary);color:#fff;border:none;border-radius:8px;padding:12px 24px;font-size:16px;font-weight:500;cursor:pointer;transition:background-color .2s ease}.browse-button:hover{background-color:var(--primary-hover)}.error-message-inline{margin-top:12px;padding:12px;background-color:#fee;border:1px solid var(--error);border-radius:8px;color:var(--error);font-size:14px}.preview-pane{background-color:#fff;border-radius:12px;padding:24px;margin-bottom:24px;box-shadow:0 1px 3px #0000001a}.preview-pane h3{font-size:18px;font-weight:600;color:var(--neutral-900);margin-bottom:16px}.preview-video{width:100%;max-width:100%;border-radius:8px;margin-bottom:16px}.metadata{display:flex;flex-direction:column;gap:8px}.metadata-item{font-size:14px;color:var(--neutral-700)}.metadata-item strong{color:var(--neutral-900);margin-right:8px}.conversion-controls{background-color:#fff;border-radius:12px;padding:24px;margin-bottom:24px;box-shadow:0 1px 3px #0000001a}.quality-selector{margin-bottom:24px}.quality-selector label{display:block;font-weight:500;color:var(--neutral-900);margin-bottom:8px}.quality-selector select{width:100%;padding:12px;border:1px solid var(--neutral-200);border-radius:8px;font-size:16px;color:var(--neutral-900);background-color:#fff;cursor:pointer;margin-bottom:8px}.quality-selector select:focus{outline:none;border-color:var(--primary)}.estimated-size{font-size:14px;color:var(--neutral-700)}.button-group{display:flex;gap:12px}.btn-primary,.btn-secondary{flex:1;padding:14px 24px;border:none;border-radius:8px;font-size:16px;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--primary-hover)}.btn-secondary{background-color:var(--neutral-100);color:var(--neutral-900)}.btn-secondary:hover:not(:disabled){background-color:var(--neutral-200)}.btn-primary:disabled,.btn-secondary:disabled{opacity:.5;cursor:not-allowed}.progress-bar-container{background-color:#fff;border-radius:12px;padding:24px;margin-bottom:24px;box-shadow:0 1px 3px #0000001a}.progress-label{font-size:16px;font-weight:500;color:var(--neutral-900);margin-bottom:12px}.progress-bar{width:100%;height:12px;background-color:var(--neutral-100);border-radius:6px;overflow:hidden;margin-bottom:8px}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary) 0%,var(--success) 100%);transition:width .3s ease;border-radius:6px}.progress-percentage{text-align:right;font-size:14px;color:var(--neutral-700)}.error-message{background-color:#fee;border:1px solid var(--error);border-radius:12px;padding:16px;margin-bottom:24px;display:flex;align-items:center;justify-content:space-between}.error-content{display:flex;align-items:center;gap:12px}.error-icon{color:var(--error);flex-shrink:0}.error-content span{color:var(--error);font-size:14px}.error-dismiss{background:none;border:none;color:var(--error);font-size:20px;cursor:pointer;padding:4px;line-height:1}.error-dismiss:hover{opacity:.7}.gif-result{background-color:#fff;border-radius:12px;padding:24px;margin-bottom:24px;box-shadow:0 1px 3px #0000001a}.gif-result h3{font-size:18px;font-weight:600;color:var(--neutral-900);margin-bottom:16px}.gif-preview{width:100%;border-radius:8px;margin-bottom:16px}.gif-result-footer{display:flex;align-items:center;justify-content:space-between;gap:12px}.gif-filename{font-size:14px;color:var(--neutral-700);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}@media(min-width:768px){.app-container{padding:48px}.app-header{margin-bottom:64px}}