/* =============================================================================
   POLAR LIGHT STUDIO — Base Styles
   =============================================================================
   CSS reset, typography defaults, and foundational styles.
   Assumes variables.css is loaded first.
============================================================================= */

/* ---------------------------------------------------------------------------
   Reset — Modern, minimal
--------------------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  line-height: var(--leading-normal);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-primary);
}

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

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

button {
  cursor: pointer;
  background: none;
  border: none;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

/* ---------------------------------------------------------------------------
   Typography
--------------------------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  line-height: var(--leading-tight);
}

h1 {
  font-size: var(--text-4xl);
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
}

h6 {
  font-size: var(--text-base);
}

p {
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

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

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

/* Links with visible interaction */
a:not([class]) {
  color: var(--color-accent);
  transition: color var(--transition-fast);
}

a:not([class]):hover {
  color: var(--color-accent-dim);
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-sm);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  padding: var(--space-4);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

pre code {
  padding: 0;
  background: none;
}

/* ---------------------------------------------------------------------------
   Focus states — Accessibility
--------------------------------------------------------------------------- */

:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------------------
   Selection
--------------------------------------------------------------------------- */

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

/* ---------------------------------------------------------------------------
   Scrollbar — Subtle, themed
--------------------------------------------------------------------------- */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-tertiary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-bg-tertiary) var(--color-bg-secondary);
}

/* ---------------------------------------------------------------------------
   Utility classes — Minimal set
--------------------------------------------------------------------------- */

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

.text-accent {
  color: var(--color-accent);
}

.text-muted {
  color: var(--color-text-tertiary);
}