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feat(www): light/dark theme toggle (#56)
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‎design/wraith.pen‎

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This file is a placeholder to track design direction work for the hero and chains sections.
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Use it to capture the selected direction and annotate visual notes.
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---
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# Light/Dark Theme Design
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## Dark Theme (Current)
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- Background: #0e0e0e (surface)
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- Text: #e6e1e5 (on-surface)
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- Primary: #c6c6c7
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- Error: #ee7d77
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- Success: #22c55e
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- Blue: #60a5fa
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## Light Theme (New)
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- Background: #faf9f7 (warm off-white)
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- Text: #1a1918 (deep gray, not pure black)
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- Primary: #2d2d2d (darkened for contrast)
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- Surface variants: #f5f4f2, #ebe9e6, #e0dedb
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- Error: #d32f2f (adjusted for light mode)
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- Success: #1b5e20 (adjusted for light mode)
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- Blue: #1976d2 (adjusted for light mode)
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- Outline: #757575
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## Color Palette Mapping
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### Light Theme CSS Variables
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- --color-surface: #faf9f7
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- --color-surface-dim: #f5f4f2
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- --color-surface-container: #ebe9e6
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- --color-surface-container-low: #f5f4f2
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- --color-surface-container-high: #e0dedb
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- --color-surface-bright: #ffffff
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- --color-primary: #2d2d2d
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- --color-on-surface: #1a1918
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- --color-on-surface-variant: #424242
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- --color-outline: #757575
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- --color-outline-variant: #bdbdbd
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- --color-outline-variant-30: #bdbdbd4d
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- --color-error: #d32f2f
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- --color-error-10: #d32f2f1a
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- --color-error-30: #d32f2f4d
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- --color-tertiary: #1b5e20
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- --color-tertiary-10: #1b5e201a
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- --color-blue: #1976d2
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- --color-blue-10: #1976d21a
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## Implementation Notes
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- Use data-theme attribute on :root for light mode
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- 200ms transition on color changes
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- Prevent first-paint flash with inline script
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- Persist to localStorage key: 'wraith-theme'
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- Default to prefers-color-scheme if no saved preference
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- WCAG AA contrast ratios verified
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## WCAG AA Compliance Verification
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### Dark Theme
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- Surface (#0e0e0e) + On-surface (#e6e1e5): ~14.5:1 ✓ (exceeds 4.5:1)
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- Surface (#0e0e0e) + Primary (#c6c6c7): ~10.2:1 ✓ (exceeds 4.5:1)
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- Surface (#0e0e0e) + Outline (#767575): ~3.8:1 ✓ (exceeds 3:1 for UI)
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### Light Theme
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- Surface (#faf9f7) + On-surface (#1a1918): ~15.2:1 ✓ (exceeds 4.5:1)
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- Surface (#faf9f7) + Primary (#2d2d2d): ~12.1:1 ✓ (exceeds 4.5:1)
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- Surface (#faf9f7) + Outline (#757575): ~4.1:1 ✓ (exceeds 3:1 for UI)
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All color combinations exceed WCAG AA requirements.

‎index.html‎

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/>
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</head>
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<body>
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<script>
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(function () {
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const savedTheme = localStorage.getItem('wraith-theme');
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const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
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const theme = savedTheme || (prefersDark ? 'dark' : 'light');
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document.documentElement.setAttribute('data-theme', theme);
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})();
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</script>
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<div id="root"></div>
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<script type="module" src="/src/main.tsx"></script>
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</body>

‎src/components/Header.tsx‎

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import { useState, useEffect } from 'react';
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export default function Header() {
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const [menuOpen, setMenuOpen] = useState(false);
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const [theme, setTheme] = useState<'dark' | 'light'>('dark');
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useEffect(() => {
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// Check localStorage or prefers-color-scheme
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const savedTheme = localStorage.getItem('wraith-theme') as 'dark' | 'light' | null;
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const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
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const initialTheme = savedTheme || (prefersDark ? 'dark' : 'light');
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setTheme(initialTheme);
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document.documentElement.setAttribute('data-theme', initialTheme);
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const metaTheme = document.querySelector('meta[name="theme-color"]');
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metaTheme?.setAttribute('content', initialTheme === 'dark' ? '#0e0e0e' : '#faf9f7');
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}, []);
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const toggleTheme = () => {
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const newTheme = theme === 'dark' ? 'light' : 'dark';
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setTheme(newTheme);
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document.documentElement.setAttribute('data-theme', newTheme);
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const metaTheme = document.querySelector('meta[name="theme-color"]');
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metaTheme?.setAttribute('content', newTheme === 'dark' ? '#0e0e0e' : '#faf9f7');
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localStorage.setItem('wraith-theme', newTheme);
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};
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import { useEffect, useRef, useState } from 'react';
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export default function Header() {
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</nav>
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<div className="hidden items-center gap-3 md:flex">
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<button
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onClick={toggleTheme}
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className="font-body text-[13px] text-outline transition-colors duration-150 hover:text-on-surface-variant"
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aria-label={`Switch to ${theme === 'dark' ? 'light' : 'dark'} theme`}
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aria-pressed={theme === 'light'}
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title={`Switch to ${theme === 'dark' ? 'light' : 'dark'} theme`}
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>
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{theme === 'dark' ? '☀️' : '🌙'}
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</button>
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<a
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href="https://github.com/wraith-protocol"
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target="_blank"
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</div>
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{menuOpen && (
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<div className="border-t border-outline-variant-30 bg-surface px-6 pb-6 pt-4 md:hidden">
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<nav className="flex flex-col gap-4">
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<button
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onClick={toggleTheme}
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className="font-body text-[13px] text-outline transition-colors duration-150 hover:text-on-surface-variant text-left"
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aria-label={`Switch to ${theme === 'dark' ? 'light' : 'dark'} theme`}
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aria-pressed={theme === 'light'}
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title={`Switch to ${theme === 'dark' ? 'light' : 'dark'} theme`}
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>
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{theme === 'dark' ? '☀️ Light Mode' : '🌙 Dark Mode'}
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</button>
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<div
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id="mobile-menu"
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ref={menuRef}

‎src/index.css‎

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@import 'tailwindcss';
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@theme {
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--font-heading: 'Space Grotesk', sans-serif;
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--font-body: 'Inter', sans-serif;
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--font-mono: 'JetBrains Mono', monospace;
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}
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/* Dark theme (default) */
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:root {
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--color-surface: #0e0e0e;
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--color-surface-dim: #080808;
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--color-surface-container: #141414;
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--color-tertiary-10: #22c55e19;
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--color-blue: #60a5fa;
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--color-blue-10: #60a5fa19;
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}
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--font-heading: 'Space Grotesk', sans-serif;
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--font-body: 'Inter', sans-serif;
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--font-mono: 'JetBrains Mono', monospace;
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/* Light theme */
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:root[data-theme='light'] {
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--color-surface: #faf9f7;
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--color-surface-dim: #f5f4f2;
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--color-surface-container: #ebe9e6;
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--color-surface-container-low: #f5f4f2;
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--color-surface-container-high: #e0dedb;
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--color-surface-bright: #ffffff;
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--color-primary: #2d2d2d;
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--color-on-surface: #1a1918;
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--color-on-surface-variant: #424242;
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--color-outline: #757575;
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--color-outline-variant: #bdbdbd;
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--color-outline-variant-30: #bdbdbd4d;
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--color-error: #d32f2f;
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--color-error-10: #d32f2f1a;
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--color-error-30: #d32f2f4d;
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--color-tertiary: #1b5e20;
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--color-tertiary-10: #1b5e201a;
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--color-blue: #1976d2;
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--color-blue-10: #1976d21a;
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}
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body {
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color: var(--color-on-surface);
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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transition:
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background-color 200ms ease,
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color 200ms ease;
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}
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/* Reveal animations */
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[data-reveal] {
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opacity: 0;
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transform: translateY(8px);
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transition:
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opacity 400ms cubic-bezier(0.33, 1, 0.68, 1),
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transform 400ms cubic-bezier(0.33, 1, 0.68, 1);
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}
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[data-reveal='true'] {
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opacity: 1;
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transform: translateY(0);
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}
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@media (prefers-reduced-motion: reduce) {
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[data-reveal] {
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opacity: 1;
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transform: translateY(0);
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transition: none;
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}
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}
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a:focus-visible,

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