html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  background-color: var(--color-bg);
  color: var(--color-text);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='48'%3E%3Cpath d='M48 0H0V48' fill='none' stroke='%230057ff' stroke-opacity='0.06' stroke-width='1'/%3E%3C/svg%3E");
  background-size: 48px 48px;
}

[data-theme="dark"] body,
body[data-theme="dark"] {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='48'%3E%3Cpath d='M48 0H0V48' fill='none' stroke='%233d82ff' stroke-opacity='0.07' stroke-width='1'/%3E%3C/svg%3E");
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

h4 {
  font-size: 1.125rem;
}

p {
  color: var(--color-text-muted);
  max-width: 65ch;
}

.lead {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  line-height: 1.7;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.875em;
  letter-spacing: 0.02em;
}

::selection {
  background-color: var(--color-accent);
  color: var(--color-accent-text);
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  padding: var(--space-3) var(--space-5);
  background: var(--color-accent);
  color: var(--color-accent-text);
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: var(--space-4);
}

.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;
}