first commit

src/lib/logos.ts

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+/** Public assets in `public/` — filenames must match deployed files. */
+const LOGO_LIGHT = '/logo-light.png';
+const LOGO_DARK = '/logo-dark.png';
+
+export function rivusLogoSrc(isDark: boolean): string {
+  return isDark ? LOGO_DARK : LOGO_LIGHT;
+}

src/lib/sections.ts

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+export type SectionId =
+  | 'services'
+  | 'adaptivework'
+  | 'process'
+  | 'whyus'
+  | 'contact';
+
+export const NAV_SECTIONS: { id: SectionId; labelKey: `nav.${string}` }[] = [
+  { id: 'services', labelKey: 'nav.services' },
+  { id: 'adaptivework', labelKey: 'nav.adaptivework' },
+  { id: 'process', labelKey: 'nav.process' },
+  { id: 'whyus', labelKey: 'nav.whyus' },
+  { id: 'contact', labelKey: 'nav.contact' },
+];

src/lib/theme.ts

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+export const THEME_STORAGE_KEY = 'rivus-theme';
+
+export type StoredTheme = 'light' | 'dark';
+
+export function getStoredTheme(): StoredTheme | null {
+  const raw = localStorage.getItem(THEME_STORAGE_KEY);
+  if (raw === 'light' || raw === 'dark') return raw;
+  return null;
+}
+
+export function resolveDark(stored: string | null, prefersDark: boolean): boolean {
+  if (stored === 'dark') return true;
+  if (stored === 'light') return false;
+  return prefersDark;
+}
+
+export function applyTheme(isDark: boolean): void {
+  document.documentElement.dataset.theme = isDark ? 'dark' : 'light';
+}
+
+export function readEffectiveDark(): boolean {
+  return document.documentElement.dataset.theme === 'dark';
+}
+
+export function toggleStoredTheme(): boolean {
+  const nextDark = !readEffectiveDark();
+  localStorage.setItem(THEME_STORAGE_KEY, nextDark ? 'dark' : 'light');
+  applyTheme(nextDark);
+  return nextDark;
+}