Defining the Fidget Spinner
I'm now zeroing in on defining the core requirements. My focus is on achieving a working fidget spinner within a single HTML/CSS file, using CSS animations for the rotation. I'm visualizing three weighted arms and a 'Spin' button to control the rotation speed. I'm focusing on ensuring it's fully functional.
Refining the Interactivity
I've decided on the implementation: a single HTML/CSS file and an interactive fidget spinner. I'm leveraging a hidden checkbox hack for the "Spin" button to control rotation speed, maintaining a pure CSS animation. The spinner will feature three weighted arms rotating around a central bearing.
Constructing the Components
My current focus is on the structural design. I'm visualizing the fidget spinner's composition, centering on divs for arms positioned at 0, 120, and 240 degrees. The weight at each arm's tip will be a circle. The intention is to design the spinner's CSS structure: a container, a rotating spinner, a center bearing, and arms numbered 1, 2, and 3. I'm moving toward @keyframes and thinking about controlling animation speeds. A slow idle spin is already in progress. However, I've had to consider avoiding "jumps" when animation speeds are swapped.
Optimizing the Animation Transition
I've hit a snag with smooth animation speed changes; @keyframes and animation-duration don't play nice together for this. Changing animation-duration results in a jump, so a continuous @keyframes spin will need to do the heavy lifting. I am thinking about a static or slow base state. I've switched from a radio button idea to a simple checkbox, #spin-toggle, with a styled label acting as the "Spin" button, and I'm updating the CSS accordingly.
Structuring the Layout
I am now focusing on the visual layout. I've defined absolute positioning with margins to center components within the container. The center bearing is a 60px circle and the arms will be three overlapping 80px circles, positioned 60px from the center. I am using transform-origin and translateY() to position the arms at 0, 120, and 240 degrees. I am working on how to create the visual connection between the center and the arms.
Refining the Aesthetics
I'm now zeroing in on the visual appearance of the fidget spinner. I'm opting for overlapping circles with the same background color, #ff5722, to avoid messy borders. Inside each arm, I'm adding a black bearing weight using a pseudo-element (::after). A gray inner circle within the center bearing completes the design. I'm thinking I'll need to consider how to handle the jump in animation. I'm focusing on either layered animations or embracing the limitations of standard CSS animation. Another idea is the transition: transform and a lot of rotations.
Implementing the Speed Change
I'm now implementing the rotation speed control using a checkbox hack. My current approach involves adjusting animation-duration to manage the fidget spinner's speed. I am focusing on the user-friendly interaction while accepting a minor visual jump when the speed changes.
Finalizing the Interactions
I've added a shadow effect for a button hover effect, with transitions for smoothness, and adjusted the scale on click. I am adding a checked state style for the "Spin" button using a sibling selector. It will also show an update to "(Fast!)". I've finalized the checkbox hack with the CSS, including an active state for the button. The rotation is updated in speed on click. I have completed the fidget spinner!
Refining the Animation
I've been playing with the current animations and decided to adjust the colors. I've switched the arm color to #e91e63, the center bearing to #eee and the border to #bbb. I've added a shadow effect. I'm focusing on ensuring these colors and elements are visually appealing and don't clash, and I'm adding z-index to each.
Adjusting Component Sizing
I'm now iterating on the visual components, with adjustments to the arms and weights. The translateY(-40px) is in place to correctly position the arm's tip. I'm focusing on ensuring each component's dimensions are accurate and visually balanced to create the correct layout.
Revising Arm Positioning
I'm now revising the arm positioning method. The current setup, top: 50%, caused downward rotation. I am considering adjusting the arm dimensions: width: 80px, height: 120px and border-radius: 40px for a pill shape. After that, I'll use transform-origin: center top, and absolute positioning with top: 50%; left: 50%; and margin-left: -40px to center the components.
Testing the Drop Shadow
I'm now zeroing in on verifying the overlapping visual elements. I've confirmed the center piece, sized at 80px x 80px with a 50% border-radius, is centered at top: 50%, left: 50% with transform: translate(-50%, -50%). I'll use a single molded shape, with no borders. I'm exploring the use of a drop shadow on the .spinner container to make it a single molded piece.
Perfecting the Aesthetics
I'm now optimizing the weight design and the center bearing appearance. I've standardized the arm weights at 50px with an 8px border and established box-sizing: border-box. This includes the center bearing. I've re-imagined the inner hole using a black circle for the bearing. I am focusing on the balance between size and detail. I've decided to go with a two-tone bearing effect for a clean look, and adjusted the border and background colors.
Refining the Visuals
I'm now iterating on the visual elements to improve their visual appeal. I've focused on using flat colors for simplicity and adjusted the center bearing with a radial gradient for a realistic effect. I've centered the center bearing, sized it, and incorporated a black circle. The arm weights have a similar style, with size tweaks, including bottom: 15px;. I am considering making the animation: spin faster on click.
I am working on increasing the speed on the button click now, I have to ensure the animation-duration is adjusted correctly. I'm focusing on ensuring it changes on the checked state.
Implementing Continuous Rotation
I am now focusing on implementing continuous rotation. My concern is whether continuous rotation is possible using transition: transform. I'm starting by implementing a perpetual motion animation via the unchecked state, which should be very smooth. This will also fix the reset issue. I am planning on testing for smoothness during continuous rotation and then adjust the "Spin" button click speed for comparison. I've re-examined the checkbox approach as a method of controlling the rotation.
I am working on refining the animations on click, specifically transition: transform with a higher rotation value, and ensuring it smoothly transitions. I am planning to remove the animation: spin entirely to make the spinner a "perpetual motion machine." I'm also ensuring the animation returns smoothly to the base speed, a very slow spin.
Finalizing the Continuous Spin
I've resolved to utilize only CSS animations for continuous and speed-adjustable rotation. I'm focusing on defining base and fast animation durations within the checkbox hack and adjusting the animation speed on the checked state. I am confident I'll have a smooth transition and continuous rotation. I am confirming a robust, simple solution.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Fidget Spinner</title>
<style>
body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
background-color: #f0f0f0;
}
.spinner-container {
position: relative;
width: 200px;
height: 200px;
display: flex;
justify-content: center;
align-items: center;
}
.spinner {
width: 150px;
height: 150px;
border-radius: 50%;
background-color: #e91e63; /* Spinner color */
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
animation: spin 2s linear infinite;
}
.arm {
position: absolute;
width: 80px;
height: 120px;
border-radius: 40px;
background-color: #e91e63; /* Arm color */
transform-origin: center top;
top: 50%;
left: 50%;
margin-left: -40px;
transform: translateY(-40px);
}
.arm::after {
content: '';
position: absolute;
bottom: 15px;
left: 50%;
transform: translateX(-50%);
width: 50px;
height: 50px;
border-radius: 50%;
background-color: black; /* Weight color */
}
.arm1 {
transform: rotate(0deg) translateY(-40px);
}
.arm2 {
transform: rotate(120deg) translateY(-40px);
}
.arm3 {
transform: rotate(240deg) translateY(-40px);
}
.center-bearing {
position: absolute;
width: 80px;
height: 80px;
border-radius: 50%;
background: radial-gradient(circle, #bbb 0%, #eee 70%); /* Center bearing gradient */
display: flex;
justify-content: center;
align-items: center;
z-index: 1; /* Ensure center bearing is above the arms */
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
.inner-circle {
width: 40px;
height: 40px;
border-radius: 50%;
background-color: black; /* Inner circle color */
}
/* Spin button styles */
.spin-toggle {
display: none; /* Hide the checkbox */
}
.spin-label {
position: absolute;
bottom: 20px;
padding: 10px 20px;
background-color: #4CAF50; /* Green */
color: white;
border: none;
border-radius: 5px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.2s, transform 0.1s;
z-index: 2;
}
.spin-label:hover {
background-color: #3e8e41;
}
.spin-label:active {
transform: scale(0.95);
}
.spin-toggle:checked + .spin-labelRefining the Spinner's Appearance
I'm now iterating on the visual aesthetics, starting with the color palette. I've been experimenting with subtle gradients and drop shadows for a more realistic feel. I'm focusing on the center bearing, and the arm gradients. My current design integrates the spinning element for a more "molded" look.
Finalizing the Design
I've been working on optimizing the spinner's aesthetics. I've switched the arm color to #e91e63, center bearing to #eee, and border to #bbb, and added a shadow effect. I've standardized arm weights, ensuring dimensions are accurate. Finally, I've simplified the center bearing with a radial gradient and black inner circle for a clean look.
Adjusting Visual Elements
I'm now revising the design and focusing on improved aesthetics with a 3D effect for the "Spin" button using background gradients, and shadow effects. I'm exploring button hover and click states with transformations and adjusting the colors. I am now experimenting with colors for the hover state, background colors, and the border to simulate a button press, while considering an inner span element for text updates via CSS. I am adjusting the text on the button based on the checked state.
Finalizing the Design
I've been working on optimizing the spinner's aesthetics and interactions, including click effects. I've switched the text to inline spans, updated the button styles, and added a hover effect. I am considering the final CSS to get the hover animation correct. I am updating my existing CSS with inline styles, for a completely self contained file.
Perfecting Arm Positioning
I'm now zeroing in on positioning the rotating arms correctly. My initial approach with top: 50% was leading to undesired results. I'm focusing on defining an arm dimension of width: 70px; height: 110px, which is the base of each arm. I am making sure the center piece and arm centers align precisely. Then I can center and rotate the arm and weight, at a height of 75px.
Enhancing the Visuals
I'm now implementing the arm weight centering, with positioning and dimensions. I'm focusing on ensuring it's visually aligned with the base of the pill-shaped arms, achieving geometric accuracy. I'm setting a bottom of 12px, for a center of weight perfectly concentric with the arm's bottom curve.
Evaluating Shadow Effects
I'm now focusing on a 3D visual for the arms and center piece. I'm using box-shadow: inset on .arm and .center-bearing, to see if a single molded piece looks good. However, there's a problem when overlapping. A higher z-index on the .center-bearing can block the arm's shadow. Alternatively, I'll go with a flat look with a drop shadow for a 3D pop. I've decided to abandon motion blur as too complicated.
Adjusting the Spin Animation
I'm now calculating the right CSS animation values to get the desired look. I've pinpointed an issue where certain rotation speeds create a stroboscopic effect, making the spinner appear static or rotating backward. I'm focusing on defining animation durations that avoid these problematic values. Right now, I'm working out the precise relationship between frame rate and animation duration to ensure a smooth, forward spin.
Fine-Tuning the Spin Speed
I am currently working on making the speed of the fidget spinner interactive and smooth. I have implemented a checkbox hack to control the animation duration, and I am adjusting it to ensure both slow and fast speeds. I am focusing on refining transitions between different rotation speeds.
Refining the Animation Speeds
I'm currently perfecting the transitions between slow and fast spin speeds, leveraging the checkbox hack. My focus is now fine-tuning the animation durations for optimal smoothness. I am working to ensure seamless transitions between speeds, especially the slower base speed. The speed changes should be fluid and visually appealing, without any jarring effects.
Implementing Smooth Rotation
I am now focusing on refining the animation transitions for a visually appealing fidget spinner. I've been optimizing the animation durations to avoid any visual jumps. I'm focusing on ensuring seamless transitions between different rotation speeds.
Finalizing the Component Geometry
I'm now zeroing in on verifying my calculations and iterating on geometric accuracy. I've re-assessed arm dimensions and confirmed the transform origin is positioned correctly. I've recalculated the arm height to 125px, with the center at y=62.5px. Then, I've checked that the spinner arms and the center piece are now aligning perfectly.
Perfecting Geometric Alignment
I'm now zeroing in on verifying my calculations and ensuring geometric alignment. I'm reassessing the arm's dimensions to confirm the transform origin's correct position. The recalculation of the arm's height to 125px has confirmed that the arms now align with the center piece.
Verifying Visual Overlap
I'm now focusing on the visual merging of the overlapping elements and ensuring it looks correct. I'm focusing on confirming my calculations, the arms and the center piece are visually merging into a single solid shape. I am ensuring that no borders are visible.
Verifying Arm Alignment
I'm now focusing on verifying the arm weights are centered within each arm. My calculation confirmed they're aligned with the arm's semi-circle bottom. I am confirming a visually symmetrical design.
Enhancing the Visual Appeal
I'm now focusing on integrating a background that enhances the spinner's visibility. I'm exploring a dark radial gradient and a grid pattern to create a contrasting backdrop. I've found an idle animation speed of 3s and a fast speed of 0.15s is optimal. I am evaluating CSS animation's responsiveness.
Finalizing Spin Toggle
I'm now fully committed to the checkbox hack for controlling spin speed; it gives a better user interaction! I have confirmed it allows seamless switching, and it's simpler than other approaches. I've re-written my tests for speed change using animation-duration. Now, I am refining the visual feedback on the "Spin" button with hover effects and a checked state, for a complete and intuitive interaction.
Refining the Interaction
I'm now integrating enhanced accessibility features and refining button behavior. I've added cursor: pointer and user-select: none for better user interaction and implemented a visually hidden checkbox to ensure accessibility via the sr-only class. I've switched to a robust approach, optimizing the button state and ensuring the UI remains intuitive, even with rapid clicking.
Verifying Arm Alignment
I'm now focusing on verifying the arm weights are centered within each arm. My calculation confirmed they're aligned with the arm's semi-circle bottom. I am confirming a visually symmetrical design.
Verifying Visual Alignment
I'm now confirming the 0, 120, and 240-degree alignment. I'm visualizing how the arms, rotating at those angles, perfectly cover the center and eliminate any gaps at the origin. I am ensuring that the visual effect, with the center piece, creates a clean geometric design.
Finalizing the Component Geometry
I'm now integrating the design updates and considering all previous learnings. I am incorporating cleaner code, standard CSS variables for colors, and a confirmed, smooth rotation animation. I am simplifying the code without unnecessary prefixes. I am very happy!
see also: https://www.lotharschulz.info/2026/02/20/gemini-3-1-pro/