/* =============================================================================
   BASE STYLES
   Typography, global defaults, and element-level styling.
   ============================================================================= */

/* Hidden SVG sprite — class has higher specificity than reset's svg { display: block } */
.svg-sprite {
  display: none;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* --- Headings --- */

h1 {
  font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl));
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: -0.025em;
  color: var(--color-text);
}

h2 {
  font-size: clamp(var(--text-xl), 3vw, var(--text-2xl));
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-snug);
  letter-spacing: -0.015em;
  color: var(--color-text);
}

h3 {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  line-height: var(--leading-snug);
  color: var(--color-text);
}

/* --- Links --- */

a {
  color: var(--color-primary);
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

a:focus-visible {
  outline: var(--color-focus-ring);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* --- Code --- */

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 0.125em 0.375em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-code-border);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  overflow-x: auto;
  tab-size: 2;
  background-color: var(--color-code-bg);
  color: var(--color-code-text);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}

/* --- Keyboard key --- */

kbd {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  background-color: var(--color-surface-alt);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-bottom-width: 3px;
  border-radius: var(--radius-sm);
  padding: 0.1em 0.4em;
  white-space: nowrap;
}

/* --- Details / Summary --- */

details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

summary {
  cursor: pointer;
  padding: var(--space-3) var(--space-4);
  font-weight: var(--font-weight-medium);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background-color: var(--color-surface-alt);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

summary::-webkit-details-marker {
  display: none;
}

summary::before {
  content: '▶';
  font-size: var(--text-xs);
  transition: transform var(--transition-fast);
}

details[open] > summary::before {
  transform: rotate(90deg);
}

summary:hover {
  background-color: var(--color-border-subtle);
  color: var(--color-text);
}

summary:focus-visible {
  outline: var(--color-focus-ring);
  outline-offset: -3px;
  border-radius: 0;
}

/* --- Strong / Em --- */

strong {
  font-weight: var(--font-weight-semibold);
}

em {
  font-style: italic;
}

/* --- Global focus-visible baseline --- */
/* Applied to anything not otherwise specified. Individual components override. */

:focus-visible {
  outline: var(--color-focus-ring);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Remove focus ring for mouse/touch — only show for keyboard */
:focus:not(:focus-visible) {
  outline: none;
}