:root {
  --radius-small: 10px;
  --radius-medium: 18px;
  --radius-large: 28px;
  --space-1: 0.375rem;
  --space-2: 0.625rem;
  --space-3: 0.875rem;
  --space-4: 1.25rem;
  --space-5: 1.75rem;
  --space-6: 2.5rem;
  --font-sans: "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-canvas);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.65;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at top left, var(--color-body-glow), transparent 34rem),
    var(--color-canvas);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: wait;
  opacity: 0.58;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-surface-strong);
  color: var(--color-text);
  padding: 0.78rem 0.9rem;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

textarea {
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus,
button:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0.25rem;
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.15;
  letter-spacing: -0.04em;
}

h2 {
  margin-bottom: 0.35rem;
  font-size: clamp(1.25rem, 2.5vw, 1.65rem);
  line-height: 1.35;
}

h3 {
  margin-bottom: 0;
  font-size: 1rem;
}

code {
  border-radius: 0.35rem;
  background: var(--color-code-bg);
  padding: 0.12rem 0.35rem;
  font-size: 0.9em;
}

[hidden] {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}