style.css

:root {
  --primary-50: #fafafa;
  --primary-100: #f4f4f5;
  --primary-200: #e4e4e7;
  --primary-300: #d4d4d8;
  --primary-400: #a1a1aa;
  --primary-500: #71717a;
  --primary-600: #52525b;
  --primary-700: #3f3f46;
  --primary-800: #27272a;
  --primary-900: #18181b;
  --primary-950: #09090b;

  --secondary-50: #faf5ff;
  --secondary-100: #f3e8ff;
  --secondary-200: #e9d5ff;
  --secondary-300: #d8b4fe;
  --secondary-400: #c084fc;
  --secondary-500: #a855f7;
  --secondary-600: #9333ea;
  --secondary-700: #7e22ce;
  --secondary-800: #6b21a8;
  --secondary-900: #581c87;
  --secondary-950: #3b0764;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  background-color: transparent;
  color: inherit;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
  border: none;
  cursor: pointer;
}

input {
  cursor: text;
}

body {
  background-color: var(--primary-100);
  color: var(--primary-900);
  font-family: "Space Grotesk", sans-serif;
}

body.dark {
  background-color: var(--primary-900);
  color: var(--primary-100);
}

#header {
  position: sticky;
  top: 0.5rem;
  display: flex;
  align-items: center;
  margin: 0.5rem;
  padding: 0.5rem;
  height: 3rem;
  border-radius: 0.25rem;
  background-color: var(--primary-200);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 30%);
  user-select: none;
}

.dark #header {
  background-color: var(--primary-800);
}

#header > a {
  font-size: 2rem;
  font-weight: 700;
}

.header-button {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 0.25rem;
  padding: 0.25rem;
  border-radius: 0.25rem;
  transition: 150ms background-color ease;
}

.header-button:hover {
  background-color: var(--primary-300);
}

.dark .header-button:hover {
  background-color: var(--primary-700);
}

.header-button:active {
  background-color: var(--primary-400);
  transition: none;
}

.dark .header-button:active {
  background-color: var(--primary-600);
}

.header-button:nth-of-type(1) {
  margin-left: auto;
}

.hidden {
  display: none;
}