html, body {
  margin: 0;
  padding: 0;
  background: var(--obs-bg-1);
  color: var(--obs-text-primary);
  font-family: var(--obs-font-sans);
  font-size: var(--obs-font-size-base);
  line-height: var(--obs-line-height-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

html { transition: background-color var(--obs-dur) var(--obs-ease); }

/* Atmospheric body wash — radial cyan upper-left, brass lower-right,
 * violet center-deep (depth cue, not a brand color). */
body {
  min-height: 100vh;
  background:
    radial-gradient(1400px 900px at 12% -10%, rgba(0, 240, 255, 0.06), transparent 55%),
    radial-gradient(1100px 760px at 95% 108%, rgba(199, 154, 82, 0.07), transparent 55%),
    radial-gradient(900px 700px at 50% 50%, var(--obs-violet-soft), transparent 70%),
    var(--obs-bg-1);
  background-attachment: fixed;
}
html[data-theme="light"] body {
  background:
    radial-gradient(1400px 900px at 12% -10%, rgba(11, 90, 102, 0.09), transparent 55%),
    radial-gradient(1100px 760px at 95% 108%, rgba(122, 83, 32, 0.12), transparent 55%),
    radial-gradient(900px 700px at 50% 50%, var(--obs-violet-soft), transparent 70%),
    var(--obs-bg-1);
  background-attachment: fixed;
}

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

.obs-shell a {
  color: var(--obs-accent);
  text-decoration: none;
}
.obs-shell a:hover {
  text-decoration: underline;
}

.obs-shell :focus-visible {
  outline: 2px solid var(--obs-focus-ring);
  outline-offset: 2px;
}

.obs-shell button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0;
}

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