/* ==========================================================================
   PaglaAI Base — Reference Implementation
   Element defaults and resets. Layer 2 of CSS_ARCHITECTURE.md.
   Depends on tokens.css. No magic numbers, no repeated values.
   ========================================================================== */

/* ---- Reset ---- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ---- Root ---- */
:root {
  font-size: 16px;
  color-scheme: light dark;
}

[data-theme="dark"] {
  color-scheme: dark;
}

/* ---- Document ---- */
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: "Pagla Sans", system-ui, -apple-system, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-regular);
  line-height: var(--font-line-height-body);
  letter-spacing: var(--font-tracking-body);
  color: var(--color-base-ink);
  background-color: var(--color-base-paper);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- Typography ---- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-medium);
  line-height: var(--font-line-height-heading);
  letter-spacing: var(--font-tracking-heading);
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
  text-wrap: balance;
}

strong,
b {
  font-weight: var(--font-weight-semibold);
  color: inherit;
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

p {
  margin-bottom: var(--space-4);
  max-width: var(--font-max-width-body);
}

small {
  font-size: var(--font-size-small);
}

/* ---- Inline code and code blocks ---- */
code,
kbd,
samp,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono",
    monospace;
  font-size: var(--font-size-code);
}

pre {
  overflow-x: auto;
  padding: var(--space-4);
  background-color: var(--color-base-surface);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

/* ---- Links ---- */
a {
  color: var(--color-accent-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--motion-duration-fast) var(--motion-easing-default);
}

a:hover {
  color: var(--color-state-focus);
}

/* ---- Lists ---- */
ul,
ol {
  padding-left: var(--space-6);
  margin-bottom: var(--space-4);
}

li {
  margin-bottom: var(--space-2);
}

/* ---- Forms and interactive elements ---- */
button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

/* ---- Accessibility: visible focus ---- */
:focus-visible {
  outline: 2px solid var(--color-state-focus);
  outline-offset: 2px;
}

/* ---- Selection ---- */
::selection {
  background-color: color-mix(in srgb, var(--color-accent-primary) 25%, transparent);
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: var(--motion-reduced) !important;
    animation-iteration-count: 1 !important;
    transition-duration: var(--motion-reduced) !important;
    scroll-behavior: auto !important;
  }
}

/* ---- Responsive typography scaling ---- */
@media (max-width: 48rem) {
  :root {
    font-size: 16px;
  }
}