Add light/dark mode toggle in settings
Settings gains a "Dark mode" switch. Theme preference is device-global (localStorage), independent of accounts. With no explicit choice the app keeps following the OS via prefers-color-scheme; picking a mode sets data-theme on <html>, which the CSS treats as an override (attribute selector beats the media query). A tiny <head> script applies a saved choice before first paint to avoid a light/dark flash. Toggling previews live, independent of Save/Cancel. Bumps the service-worker cache. Verified in a headless-browser run: default follows OS, enabling dark swaps the palette, the choice persists across reload, and toggling back restores light. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Alexander Heldt
+24
@@ -1485,15 +1485,39 @@
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});
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// Settings dialog (puppy name + birthday)
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// ---------- theme ----------
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// Preference is device-global (not per user). No stored choice → follow the
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// OS via the prefers-color-scheme media query; a choice sets data-theme on
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// <html>, which the CSS treats as an override. The <head> applies any saved
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// choice before first paint; this just resolves state and reacts to the toggle.
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const THEME_KEY = "puppy-tracker:theme";
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const prefersDark = () =>
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window.matchMedia && window.matchMedia("(prefers-color-scheme: dark)").matches;
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function effectiveTheme() {
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const s = localStorage.getItem(THEME_KEY);
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return s === "light" || s === "dark" ? s : (prefersDark() ? "dark" : "light");
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}
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function setTheme(theme) {
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document.documentElement.dataset.theme = theme;
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try { localStorage.setItem(THEME_KEY, theme); } catch { /* ignore */ }
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}
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const settingsDialog = document.getElementById("settings-dialog");
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const settingsForm = document.getElementById("settings-form");
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const settingsName = document.getElementById("settings-name");
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const settingsBirthday = document.getElementById("settings-birthday");
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const settingsTheme = document.getElementById("settings-theme");
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// Apply live so the toggle previews immediately (independent of Save/Cancel).
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settingsTheme.addEventListener("change", () => {
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setTheme(settingsTheme.checked ? "dark" : "light");
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});
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function openSettingsDialog() {
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const cfg = loadConfig();
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settingsName.value = cfg.name;
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settingsBirthday.value = cfg.birthday;
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settingsTheme.checked = effectiveTheme() === "dark";
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settingsDialog.showModal();
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setTimeout(() => settingsName.focus(), 50);
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}
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@@ -9,6 +9,16 @@
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<link rel="icon" href="icon.svg" type="image/svg+xml" />
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<link rel="apple-touch-icon" href="icon.svg" />
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<link rel="stylesheet" href="style.css" />
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<script>
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// Apply a saved theme before first paint so there's no light/dark flash.
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// No saved choice → leave it to the prefers-color-scheme media query.
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(function () {
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try {
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var t = localStorage.getItem("puppy-tracker:theme");
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if (t === "light" || t === "dark") document.documentElement.dataset.theme = t;
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} catch (e) {}
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})();
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</script>
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</head>
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<body>
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<!-- Login / register gate. Shown until the session check succeeds; the app
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@@ -188,6 +198,10 @@
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<label>Birthday
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<input type="date" id="settings-birthday" />
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</label>
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<label class="toggle-row">
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<span>Dark mode</span>
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<input type="checkbox" id="settings-theme" role="switch" class="switch" />
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</label>
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<menu>
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<button value="cancel" class="ghost">Cancel</button>
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<button value="save" id="settings-save">Save</button>
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+50
-1
@@ -17,8 +17,12 @@
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--shadow: 0 1px 2px rgba(20, 14, 60, 0.05), 0 4px 16px rgba(20, 14, 60, 0.05);
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}
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/* Dark palette. Two triggers, same values (CSS has no way to share them):
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system prefers dark and the user hasn't forced light, OR the user picked
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dark via the Settings toggle. The [data-theme] attribute (set from JS) beats
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the media query on specificity, so an explicit choice always wins. */
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@media (prefers-color-scheme: dark) {
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:root {
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:root:not([data-theme="light"]) {
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--bg: #14131a;
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--surface: #1f1e28;
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--text: #ebeaf2;
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@@ -29,6 +33,16 @@
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--shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.3);
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}
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}
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:root[data-theme="dark"] {
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--bg: #14131a;
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--surface: #1f1e28;
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--text: #ebeaf2;
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--muted: #9c9bab;
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--accent: #a690ff;
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--accent-soft: #2a2640;
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--border: #2c2a3a;
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--shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.3);
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}
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* { box-sizing: border-box; }
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@@ -614,3 +628,38 @@ button.linklike:hover { text-decoration: underline; filter: none; }
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line-height: 1.4;
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}
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.danger-text strong { color: var(--danger); }
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/* ---------- settings toggle switch ---------- */
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.toggle-row {
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display: flex;
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align-items: center;
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justify-content: space-between;
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gap: 12px;
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}
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.toggle-row > span { color: var(--text); font-size: 0.95rem; }
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input.switch {
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appearance: none;
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-webkit-appearance: none;
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width: 44px;
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height: 26px;
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margin: 0;
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border-radius: 13px;
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background: var(--border);
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position: relative;
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cursor: pointer;
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flex-shrink: 0;
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transition: background 0.15s ease;
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}
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input.switch::after {
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content: "";
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position: absolute;
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top: 3px;
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left: 3px;
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width: 20px;
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height: 20px;
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border-radius: 50%;
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background: #fff;
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transition: transform 0.15s ease;
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}
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input.switch:checked { background: var(--accent); }
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input.switch:checked::after { transform: translateX(18px); }
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