circle · chain · Haiku 4.5 · step 019 of 64

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Circle Display</title>
  <style>
    :root {
      --color-white: #ffffff;
      --color-gold: #ffd700;
      --color-pink: #ff6b9d;
      --color-teal: #4ecdc4;
      --color-mint: #95e1d3;
      --shadow-color: rgba(0, 0, 0, 0.3);
      --transition-normal: 0.3s ease;
      --transition-slow: 0.6s ease-out;
      --color-mode-1-rgb: 255, 107, 157;
      --color-mode-2-rgb: 78, 205, 196;
      --color-mode-3-rgb: 149, 225, 211;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    html, body {
      width: 100%;
      height: 100%;
      overflow: hidden;
    }
    body {
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 20px;
      background: linear-gradient(135deg, #5f6fd1 0%, #6b3fa0 100%);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: var(--color-white);
      font-size: 14px;
      padding: 20px;
      min-height: 100vh;
    }
    .circle-container {
      cursor: pointer;
      border: none;
      background: none;
      padding: 0;
      position: relative;
      will-change: transform;
    }
    .circle-container:hover {
      transform: scale(1.06);
    }
    .circle-container:focus {
      outline: none;
    }
    .circle-container:focus-visible {
      transform: scale(1.08);
      outline: 3px solid rgba(255, 255, 255, 0.7);
      outline-offset: 12px;
      border-radius: 50%;
    }
    svg {
      width: min(400px, 80vw);
      height: min(400px, 80vw);
      display: block;
      animation: fadeIn var(--transition-slow);
    }
    circle {
      fill: var(--color-white);
      stroke: rgba(255, 255, 255, 0.2);
      stroke-width: 2;
      animation: pulse 3s ease-in-out infinite;
      filter: drop-shadow(0 20px 40px var(--shadow-color));
      transition: fill 0.3s ease, r 0.3s ease, stroke 0.3s ease, filter 0.3s ease;
      will-change: r, fill, filter;
    }
    .circle-container:is(:hover, :focus-visible) circle {
      fill: #e8f4f8;
      r: 205;
      stroke: rgba(255, 255, 255, 0.4);
    }
    .circle-container.active circle {
      fill: var(--color-gold);
      stroke: rgba(255, 215, 0, 0.3);
      animation: pulse-active 0.6s ease-in-out;
      filter: drop-shadow(0 20px 40px rgba(255, 215, 0, 0.5));
      r: 200;
    }

    [class*="color-mode-"] circle {
      fill: var(--mode-color);
      stroke: rgba(var(--mode-rgb), 0.3);
      filter: drop-shadow(0 20px 40px rgba(var(--mode-rgb), 0.3));
    }
    [class*="color-mode-"]:is(:hover, :focus-visible) circle {
      stroke: rgba(var(--mode-rgb), 0.5);
    }
    [class*="color-mode-"].active circle {
      filter: drop-shadow(0 20px 40px rgba(var(--mode-rgb), 0.5));
    }

    .circle-container.color-mode-1 { --mode-color: var(--color-pink); --mode-rgb: var(--color-mode-1-rgb); }
    .circle-container.color-mode-2 { --mode-color: var(--color-teal); --mode-rgb: var(--color-mode-2-rgb); }
    .circle-container.color-mode-3 { --mode-color: var(--color-mint); --mode-rgb: var(--color-mode-3-rgb); }

    .hint {
      font-size: 12px;
      opacity: 0.85;
      transition: opacity var(--transition-normal);
      letter-spacing: 0.5px;
      max-width: 85%;
      line-height: 1.6;
      margin-top: 12px;
      position: relative;
      text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
      will-change: opacity;
    }

    .mode-indicator {
      font-size: 10px;
      opacity: 0;
      margin-top: 8px;
      letter-spacing: 1px;
      text-transform: uppercase;
      transition: opacity var(--transition-normal);
      height: 16px;
    }
    .mode-indicator.visible {
      opacity: 0.9;
    }

    .controls {
      display: flex;
      gap: 12px;
      margin-top: 10px;
      flex-wrap: wrap;
      justify-content: center;
      width: 100%;
    }

    .control-btn {
      padding: 8px 16px;
      font-size: 11px;
      font-weight: 600;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      background: rgba(255, 255, 255, 0.15);
      color: var(--color-white);
      border: 1px solid rgba(255, 255, 255, 0.3);
      border-radius: 20px;
      cursor: pointer;
      transition: background-color var(--transition-normal), border-color var(--transition-normal), transform var(--transition-normal), box-shadow var(--transition-normal);
      backdrop-filter: blur(4px);
      will-change: transform;
      outline: none;
    }

    .control-btn:hover {
      background: rgba(255, 255, 255, 0.25);
      border-color: rgba(255, 255, 255, 0.5);
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    }

    .control-btn:active {
      transform: translateY(0) scale(0.98);
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }

    .control-btn:focus-visible {
      outline: 2px solid rgba(255, 255, 255, 0.7);
      outline-offset: 4px;
    }
    .control-btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }
    @keyframes pulse {
      0%, 100% { r: 200; opacity: 0.95; }
      50% { r: 203; opacity: 1; }
    }
    @keyframes pulse-active {
      0% { r: 200; }
      50% { r: 210; }
      100% { r: 200; }
    }
    @keyframes fadeIn {
      from { opacity: 0; transform: scale(0.9); }
      to { opacity: 1; transform: scale(1); }
    }
    @keyframes colorShift {
      0% { filter: saturate(1) brightness(1); }
      50% { filter: saturate(1.3) brightness(1.1); }
      100% { filter: saturate(1) brightness(1); }
    }
    .color-shifting circle {
      animation: colorShift 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
      transform-origin: center;
    }
    .keyboard-hint {
      font-size: 10px;
      opacity: 0.6;
      margin-top: 6px;
      letter-spacing: 0.3px;
      transition: opacity var(--transition-normal);
    }
    .keyboard-hint kbd {
      background: rgba(255, 255, 255, 0.15);
      border: 1px solid rgba(255, 255, 255, 0.25);
      border-radius: 3px;
      padding: 2px 6px;
      font-family: 'Monaco', 'Courier New', monospace;
      font-size: 9px;
      font-weight: 500;
      display: inline-block;
      margin: 0 2px;
    }
    @media (pointer: coarse) {
      .keyboard-hint {
        display: none;
      }
    }
    main {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
      text-align: center;
      width: 100%;
    }

    @media (max-width: 480px) {
      body {
        gap: 12px;
        padding: 16px;
      }
      svg {
        width: min(320px, 75vw);
        height: min(320px, 75vw);
      }
      .hint {
        font-size: 11px;
        max-width: 90%;
        margin-top: 10px;
      }
      .mode-indicator {
        font-size: 9px;
      }
      .control-btn {
        padding: 10px 18px;
        font-size: 10px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
      }
    }
    @media (max-width: 360px) {
      body {
        gap: 8px;
        padding: 12px;
      }
      svg {
        width: min(280px, 70vw);
        height: min(280px, 70vw);
      }
      .controls {
        flex-wrap: wrap;
      }
    }
    @media (prefers-reduced-motion: reduce) {
      * {
        animation: none !important;
        transition: none !important;
      }
    }
    @supports (backdrop-filter: blur(0)) {
      .control-btn {
        background: rgba(255, 255, 255, 0.1);
      }
    }
    @supports not (backdrop-filter: blur(0)) {
      .control-btn {
        background: rgba(0, 0, 0, 0.3);
      }
    }
  </style>
</head>
<body>
  <main>
    <button class="circle-container" id="decorative-circle" aria-label="Interactive circle - click to toggle" aria-pressed="false">
      <svg viewBox="0 0 400 400" width="400" height="400" aria-hidden="true" role="presentation">
        <circle cx="200" cy="200" r="200"/>
      </svg>
    </button>
    <div class="mode-indicator" id="mode-indicator" aria-live="polite" aria-atomic="true" aria-label="Current color mode"></div>
    <div class="controls" role="group" aria-label="Circle controls">
      <button class="control-btn" id="cycle-btn" aria-label="Cycle to next color">Cycle Color</button>
      <button class="control-btn" id="reset-btn" aria-label="Reset to default state">Reset</button>
    </div>
  </main>
  <div class="hint" id="hint-text" role="status" aria-live="polite" aria-relevant="text">Click to activate • Double-click to change color</div>
  <div class="keyboard-hint" aria-label="Keyboard shortcuts: Space or Enter to toggle, C to cycle color, R to reset">Press <kbd>C</kbd> to cycle • <kbd>R</kbd> to reset</div>

  <script>
    const CONFIG = {
      storageKey: 'circle-state',
      tapDelay: 300,
      colorShiftDuration: 500,
      colorModes: [
        { class: 'default', name: 'Default White' },
        { class: 'color-mode-1', name: 'Pink' },
        { class: 'color-mode-2', name: 'Teal' },
        { class: 'color-mode-3', name: 'Mint' }
      ],
      isTouch: 'ontouchstart' in window || navigator.maxTouchPoints > 0
    };

    const el = {
      circle: document.getElementById('decorative-circle'),
      hint: document.getElementById('hint-text'),
      modeIndicator: document.getElementById('mode-indicator'),
      cycleBtn: document.getElementById('cycle-btn'),
      resetBtn: document.getElementById('reset-btn')
    };

    let state = { active: false, colorMode: 0 };
    let lastTapTime = 0;
    let tapTimeout = null;

    const getColorModeClass = (mode) => CONFIG.colorModes[mode].class;
    const getColorModeName = (mode) => CONFIG.colorModes[mode].name;

    const storage = {
      save() {
        try {
          localStorage.setItem(CONFIG.storageKey, JSON.stringify(state));
        } catch {
          // Silently fail if localStorage is unavailable or quota exceeded
        }
      },
      load() {
        try {
          const saved = localStorage.getItem(CONFIG.storageKey);
          if (saved) {
            const parsed = JSON.parse(saved);
            if (parsed && typeof parsed === 'object') {
              state = { ...state, ...parsed };
            }
          }
        } catch {
          // Silently fail if parsing fails
        }
      }
    };

    const updateClasses = () => {
      const colorClasses = CONFIG.colorModes.map(m => m.class);
      el.circle.classList.remove('active', ...colorClasses);
      el.circle.setAttribute('aria-pressed', state.active);
      if (state.active) el.circle.classList.add('active');
      if (state.colorMode > 0) el.circle.classList.add(getColorModeClass(state.colorMode));
    };

    const updateUI = () => {
      const mainText = state.active ? 'Active!' : 'Click to activate';
      let hintParts = [mainText];

      if (CONFIG.isTouch) {
        hintParts.push(state.active ? 'Tap to change color' : 'Tap twice to change color');
      } else {
        hintParts.push('Double-click to change color');
      }

      el.hint.textContent = hintParts.join(' • ');

      const showMode = state.active && state.colorMode > 0;
      el.modeIndicator.classList.toggle('visible', showMode);
      if (showMode) {
        const modeName = getColorModeName(state.colorMode);
        el.modeIndicator.textContent = modeName;
      }
    };

    const applyState = () => {
      updateClasses();
      updateUI();
    };

    const toggleActive = () => {
      state.active = !state.active;
      applyState();
      storage.save();
    };

    const cycleColor = () => {
      state.colorMode = (state.colorMode + 1) % CONFIG.colorModes.length;
      state.active = true;
      el.circle.classList.add('color-shifting');
      setTimeout(() => el.circle.classList.remove('color-shifting'), CONFIG.colorShiftDuration);
      applyState();
      storage.save();
    };

    const resetState = () => {
      state = { active: false, colorMode: 0 };
      applyState();
      storage.save();
    };

    const handleDblClick = (e) => {
      e.preventDefault();
      cycleColor();
    };

    const handleTouchEnd = (e) => {
      const now = Date.now();
      if (now - lastTapTime < CONFIG.tapDelay && lastTapTime > 0) {
        cycleColor();
        lastTapTime = 0;
        clearTimeout(tapTimeout);
      } else {
        lastTapTime = now;
        clearTimeout(tapTimeout);
        tapTimeout = setTimeout(() => { lastTapTime = 0; }, CONFIG.tapDelay);
      }
    };

    const keyHandlers = {
      ' ': toggleActive,
      'enter': toggleActive,
      'c': cycleColor,
      'r': resetState
    };

    const handleKeyDown = (e) => {
      const handler = keyHandlers[e.key.toLowerCase()];
      if (handler) {
        e.preventDefault();
        handler();
      }
    };

    const initListeners = () => {
      el.circle.addEventListener('click', toggleActive);
      el.circle.addEventListener('dblclick', handleDblClick);
      el.circle.addEventListener('touchend', handleTouchEnd);
      el.circle.addEventListener('blur', () => {
        lastTapTime = 0;
        clearTimeout(tapTimeout);
      });
      document.addEventListener('keydown', handleKeyDown);
      el.cycleBtn.addEventListener('click', cycleColor);
      el.resetBtn.addEventListener('click', resetState);
    };

    const initApp = () => {
      storage.load();
      applyState();
      initListeners();
      requestAnimationFrame(() => el.circle.focus());
    };

    if (document.readyState === 'loading') {
      document.addEventListener('DOMContentLoaded', initApp);
    } else {
      initApp();
    }
  </script>
</body>
</html>

        box-sizing: border-box;      }+     html {+       scroll-behavior: smooth;+     }      html, body {        width: 100%;⋯ line 112      .hint {        font-size: 12px;-       opacity: 0.75;+       opacity: 0.85;        transition: opacity var(--transition-normal);        letter-spacing: 0.5px;⋯ line 119        margin-top: 12px;        position: relative;-       text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);+       text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);        will-change: opacity;      }⋯ line 201      }      .color-shifting circle {-       animation: colorShift 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) !important;+       animation: colorShift 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);        transform-origin: center;      }+     .keyboard-hint {+       font-size: 10px;+       opacity: 0.6;+       margin-top: 6px;+       letter-spacing: 0.3px;+       transition: opacity var(--transition-normal);+     }+     .keyboard-hint kbd {+       background: rgba(255, 255, 255, 0.15);+       border: 1px solid rgba(255, 255, 255, 0.25);+       border-radius: 3px;+       padding: 2px 6px;+       font-family: 'Monaco', 'Courier New', monospace;+       font-size: 9px;+       font-weight: 500;+       display: inline-block;+       margin: 0 2px;+     }+     @media (pointer: coarse) {+       .keyboard-hint {+         display: none;+       }+     }      main {        display: flex;⋯ line 307    </main>    <div class="hint" id="hint-text" role="status" aria-live="polite" aria-relevant="text">Click to activate • Double-click to change color</div>+   <div class="keyboard-hint" aria-label="Keyboard shortcuts: Space or Enter to toggle, C to cycle color, R to reset">Press <kbd>C</kbd> to cycle • <kbd>R</kbd> to reset</div>      <script>⋯ line 333      let state = { active: false, colorMode: 0 };      let lastTapTime = 0;+     let tapTimeout = null;        const getColorModeClass = (mode) => CONFIG.colorModes[mode].class;⋯ line 376          hintParts.push(state.active ? 'Tap to change color' : 'Tap twice to change color');        } else {-         hintParts.push('Double-click to change color • Press C or R for shortcuts');+         hintParts.push('Double-click to change color');        }  ⋯ line 425          cycleColor();          lastTapTime = 0;+         clearTimeout(tapTimeout);        } else {          lastTapTime = now;+         clearTimeout(tapTimeout);+         tapTimeout = setTimeout(() => { lastTapTime = 0; }, CONFIG.tapDelay);        }      };⋯ line 452        el.circle.addEventListener('dblclick', handleDblClick);        el.circle.addEventListener('touchend', handleTouchEnd);-       el.circle.addEventListener('blur', () => { lastTapTime = 0; });+       el.circle.addEventListener('blur', () => {+         lastTapTime = 0;+         clearTimeout(tapTimeout);+       });        document.addEventListener('keydown', handleKeyDown);        el.cycleBtn.addEventListener('click', cycleColor);