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<script lang="ts">
import { browser } from "$app/environment";
function getInitialTheme(): "light" | "dark" {
if (browser) {
const fromRoot = document.documentElement.getAttribute("data-theme");
if (fromRoot === "light" || fromRoot === "dark") return fromRoot;
const stored = localStorage.getItem("theme");
if (stored === "light" || stored === "dark") return stored;
return window.matchMedia("(prefers-color-scheme: dark)").matches
? "dark"
: "light";
}
return "light";
}
let theme = $state<"light" | "dark">(getInitialTheme());
function applyTheme(newTheme: "light" | "dark") {
if (browser) {
document.documentElement.setAttribute("data-theme", newTheme);
localStorage.setItem("theme", newTheme);
}
}
$effect(() => {
applyTheme(theme);
});
function toggleTheme() {
theme = theme === "light" ? "dark" : "light";
}
</script>
<button
class="theme-toggle"
onclick={toggleTheme}
aria-label={theme === "light"
? "Switch to dark mode"
: "Switch to light mode"}
title={theme === "light" ? "Switch to dark mode" : "Switch to light mode"}
>
{#if theme === "light"}
<svg
xmlns="http://www.w3.org/2000/svg"
width="20"
height="20"
viewBox="0 0 24 24"
fill="none"
stroke="currentColor"
stroke-width="2"
stroke-linecap="round"
stroke-linejoin="round"
>
<path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"></path>
</svg>
{:else}
<svg
xmlns="http://www.w3.org/2000/svg"
width="20"
height="20"
viewBox="0 0 24 24"
fill="none"
stroke="currentColor"
stroke-width="2"
stroke-linecap="round"
stroke-linejoin="round"
>
<circle cx="12" cy="12" r="5"></circle>
<line x1="12" y1="1" x2="12" y2="3"></line>
<line x1="12" y1="21" x2="12" y2="23"></line>
<line x1="4.22" y1="4.22" x2="5.64" y2="5.64"></line>
<line x1="18.36" y1="18.36" x2="19.78" y2="19.78"></line>
<line x1="1" y1="12" x2="3" y2="12"></line>
<line x1="21" y1="12" x2="23" y2="12"></line>
<line x1="4.22" y1="19.78" x2="5.64" y2="18.36"></line>
<line x1="18.36" y1="5.64" x2="19.78" y2="4.22"></line>
</svg>
{/if}
</button>
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