/* ===== Base reset & typography ===== */
*, *::before, *::after {
  box-sizing: border-box;
}

html { font-size: 16px; }

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background-color: var(--color-background, var(--color-neutral-0));
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
}

img, svg, video {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary-600);             /* brand-tinted link */
  text-decoration: none;
  transition: color var(--transition-base, 150ms ease);
}
a:hover, a:focus-visible { text-decoration: underline; }

button, input, select, textarea { font: inherit; color: inherit; }
button, [role="button"] { cursor: pointer; }
button:disabled, [role="button"][aria-disabled="true"] { cursor: not-allowed; }

/* Focus ring: 3px, brand-tinted, with small offset */
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible,
:focus-visible {
  outline: var(--focus-ring-width, 3px) solid var(--color-focus-ring, rgba(30,58,138,.35));
  outline-offset: var(--space-3xs, 2px);
}

/* Headings (exam authority: h1/h2=800, h3=700) */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  margin: 0 0 var(--space-sm, 0.75rem);
  font-weight: var(--font-weight-semibold, 600);
}
h1 {
  font-size: var(--font-size-4xl, 2.25rem);
  line-height: var(--line-height-tight);
  font-weight: var(--font-weight-extrabold, 800);
}
h2 {
  font-size: var(--font-size-3xl, 1.875rem);
  line-height: var(--line-height-snug);
  font-weight: var(--font-weight-extrabold, 800);
}
h3 {
  font-size: var(--font-size-2xl, 1.5rem);
  line-height: var(--line-height-snug);
  font-weight: var(--font-weight-bold, 700);
}
h4 { font-size: var(--font-size-xl, 1.25rem); }

p {
  margin: 0 0 var(--space-md, 1rem);
  color: var(--color-text-secondary, var(--color-neutral-600));
}

/* Code samples (used in styleguide usage blocks) */
code {
  font-family: var(--font-family-mono, 'SFMono-Regular','Menlo','Consolas','Liberation Mono',monospace);
  font-size: var(--font-size-sm, .875rem);
  background: var(--color-surface-subtle, #f1f5f9);
  padding: 0 var(--space-2xs, .25rem);
  border-radius: var(--radius-sm, .375rem);
}
pre {
  margin: 0;
  font-family: var(--font-family-mono, 'SFMono-Regular','Menlo','Consolas','Liberation Mono',monospace);
  font-size: var(--font-size-sm, .875rem);
  line-height: var(--line-height-relaxed, 1.7);
  background: var(--color-surface, #fff);
  border: var(--border-width, 1px) solid var(--color-border, #d0d5dd);
  border-radius: var(--radius-lg, .75rem);
  padding: var(--space-md, 1rem);
  overflow-x: auto;
}

/* Container */
.container {
  width: min(100%, var(--container-max-width, 1200px));
  margin: 0 auto;
  padding: 0 var(--space-3, 1rem);
}

/* ===== Styleguide layout helpers (.sg-*) ===== */
.sg-header {
  background: var(--color-surface, #fff);
  border-bottom: var(--border-width, 1px) solid var(--color-border, #d0d5dd);
  padding: var(--space-xl, 2rem) var(--space-lg, 1.5rem);
  box-shadow: var(--shadow-xs, 0 1px 2px rgba(15,23,42,0.08));
}
.sg-header p { max-width: 640px; }

.sg-container {
  max-width: 1120px;
  margin: 0 auto;
  padding: var(--space-xl, 2rem) var(--space-lg, 1.5rem) var(--space-2xl, 3rem);
}

.sg-section { margin-bottom: var(--space-2xl, 3rem); }
.sg-section h2 { margin-bottom: var(--space-md, 1rem); }
.sg-lead { font-size: var(--font-size-lg, 1.125rem); color: var(--color-text-secondary); max-width: 720px; }

.sg-section-grid {
  display: grid;
  gap: var(--space-lg, 1.5rem);
  align-items: start;
}
.sg-preview {
  display: flex; flex-wrap: wrap; gap: var(--space-sm, .75rem);
  padding: var(--space-lg, 1.5rem);
  background: var(--color-surface, #fff);
  border: var(--border-width, 1px) solid var(--color-border, #d0d5dd);
  border-radius: var(--radius-lg, .75rem);
  box-shadow: var(--shadow-xs, 0 1px 2px rgba(15,23,42,0.08));
}
.sg-preview--column { flex-direction: column; }
.sg-usage pre { min-height: 100%; }
.sg-usage-title {
  font-size: var(--font-size-sm, .875rem);
  font-weight: var(--font-weight-medium, 500);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: var(--space-xs, .5rem);
}

/* Token swatches */
.token-grid { display: grid; gap: var(--space-sm, .75rem); width: 100%; }
@media (min-width: 600px) {
  .token-grid { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
}
.token-swatch {
  display: flex; flex-direction: column; gap: var(--space-2xs, .25rem);
  padding: var(--space-md, 1rem);
  border-radius: var(--radius-lg, .75rem);
  background: var(--swatch-bg, var(--color-surface));
  color: var(--swatch-color, var(--color-text-primary));
  border: var(--border-width, 1px) solid var(--color-border, #d0d5dd);
  box-shadow: var(--shadow-xs, 0 1px 2px rgba(15,23,42,0.08));
}
.token-swatch strong { font-weight: var(--font-weight-semibold, 600); }

/* Spacing demo */
.spacing-stack { display: flex; align-items: flex-end; gap: var(--space-sm, .75rem); }
.spacing-box {
  width: var(--min-interactive-size, 44px);
  background: var(--color-primary-100, #eff6ff);
  color: var(--color-primary-700, var(--brand-600));
  border-radius: var(--radius-sm, .375rem);
  display: flex; align-items: flex-end; justify-content: center;
  padding-bottom: var(--space-2xs, .25rem);
  font-size: var(--font-size-xs, .75rem);
  font-weight: var(--font-weight-medium, 500);
}

/* Form demo helpers */
.form-demo { display:flex; flex-direction:column; gap: var(--space-sm, .75rem); width:min(100%, 360px); }
.form-demo-inline { display:flex; flex-direction:column; gap: var(--space-xs, .5rem); }
.form-choice { display:flex; align-items:center; gap: var(--space-xs, .5rem); font-size: var(--font-size-sm, .875rem); color: var(--color-neutral-700, #434957); }

/* Badge/Alert demo stacks */
.badge-row { display:flex; flex-wrap:wrap; gap: var(--space-sm, .75rem); }
.alert-stack { display:flex; flex-direction:column; gap: var(--space-sm, .75rem); width:min(100%, 640px); }

/* Responsive containers */
@media (max-width: 768px) {
  .sg-container { padding: var(--space-lg, 1.5rem); }
  .sg-header { padding: var(--space-lg, 1.5rem); }
  .sg-section-grid { grid-template-columns: 1fr; }
}
@media (min-width: 769px) {
  .sg-section-grid { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); }
}