/* base.css — global resets and foundational styles
   All values reference Oracle custom properties from tokens.css.
   Do not hardcode any colour, size, spacing, or font value here. */

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

html {
  font-size: 16px; /* root — Oracle rem values are relative to this */
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  background-color: var(--oracle-color-page);
  color: var(--oracle-color-ink);
  font-family: var(--oracle-font-body);
  font-size: var(--oracle-size-body);
  font-weight: var(--oracle-weight-body);
  line-height: var(--oracle-lh-body);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── Typography ──────────────────────────────────────────────────────────── */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--oracle-font-display);
  font-weight: var(--oracle-weight-h1);
  line-height: var(--oracle-lh-h1);
  letter-spacing: var(--oracle-tracking-h1);
  color: var(--oracle-color-ink);
}

h1 { font-size: var(--oracle-size-h1); line-height: var(--oracle-lh-h1); letter-spacing: var(--oracle-tracking-h1); }
h2 { font-size: var(--oracle-size-h2); line-height: var(--oracle-lh-h2); letter-spacing: var(--oracle-tracking-h2); }
h3 { font-size: var(--oracle-size-h3); line-height: var(--oracle-lh-h3); font-family: var(--oracle-font-body); font-style: italic; font-weight: var(--oracle-weight-body-light); letter-spacing: 0; }

p { margin-bottom: var(--oracle-space-s3); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--oracle-color-sky);
  text-decoration: none;
  transition: color var(--oracle-motion-duration-fast) var(--oracle-motion-easing);
}

a:hover { color: var(--oracle-color-sky-pale); }

/* Focus visible — SC 2.4.11 AA, SC 2.4.13 AAA aspirational */
:focus-visible {
  outline: 2px solid var(--oracle-color-sky);
  outline-offset: 3px;
  border-radius: var(--oracle-border-radius);
}

/* ─── Layout ──────────────────────────────────────────────────────────────── */

.container {
  width: 100%;
  max-width: var(--oracle-layout-page-max-width);
  margin-inline: auto;
  padding-inline: var(--oracle-grid-mobile-margin);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--oracle-grid-tablet-margin); }
}

@media (min-width: 1280px) {
  .container { padding-inline: var(--oracle-grid-desktop-margin); }
}

@media (min-width: 1920px) {
  .container { padding-inline: var(--oracle-grid-wide-margin); }
}

/* Readable prose column */
.content-column {
  max-width: var(--oracle-layout-content-max-width);
}

/* ─── Utility ─────────────────────────────────────────────────────────────── */

.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;
}

.font-display { font-family: var(--oracle-font-display); }
.font-body    { font-family: var(--oracle-font-body); }
.font-mono    { font-family: var(--oracle-font-mono); }

.text-muted   { color: var(--oracle-color-ink-muted); }
.text-soft    { color: var(--oracle-color-ink-soft); }
.text-sky     { color: var(--oracle-color-sky); }