/* MellyCore AIOS — base layer: reset, typography, background, layout shell.
   Static-first: no animations, no JavaScript hooks required. */

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background-color: var(--color-void-black);
  color: var(--color-cold-white);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  overflow-x: hidden;
  position: relative;
}

/* Deep-space canvas: sparse static starfield (design system §13).
   Pure CSS radial gradients — no canvas, no particles, no motion. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    radial-gradient(1px 1px at 12% 18%, rgba(255, 255, 255, 0.28), transparent 100%),
    radial-gradient(1px 1px at 34% 62%, rgba(255, 255, 255, 0.18), transparent 100%),
    radial-gradient(1.5px 1.5px at 58% 30%, rgba(255, 255, 255, 0.22), transparent 100%),
    radial-gradient(1px 1px at 73% 74%, rgba(255, 255, 255, 0.16), transparent 100%),
    radial-gradient(1px 1px at 88% 12%, rgba(255, 255, 255, 0.24), transparent 100%),
    radial-gradient(1.5px 1.5px at 22% 88%, rgba(255, 255, 255, 0.14), transparent 100%),
    radial-gradient(1px 1px at 45% 45%, rgba(255, 255, 255, 0.12), transparent 100%),
    radial-gradient(1px 1px at 66% 55%, rgba(255, 255, 255, 0.2), transparent 100%),
    radial-gradient(1px 1px at 92% 42%, rgba(255, 255, 255, 0.15), transparent 100%),
    radial-gradient(1px 1px at 8% 40%, rgba(255, 255, 255, 0.18), transparent 100%);
  background-repeat: repeat;
  background-size: 640px 640px;
  pointer-events: none;
}

/* One restrained nebula halo behind the upper page (max 1–2 per viewport). */
body::after {
  content: "";
  position: absolute;
  top: -10vh;
  left: 50%;
  transform: translateX(-50%);
  width: min(1100px, 100%);
  height: 70vh;
  z-index: -1;
  background: var(--gradient-nebula);
  pointer-events: none;
}

/* Typography */
h1,
h2,
h3 {
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 {
  font-size: var(--text-hero);
  font-weight: 800;
}

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

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

p {
  max-width: 72ch;
  text-wrap: pretty;
}

a {
  color: var(--color-muted-lavender);
  text-decoration-color: rgba(196, 181, 253, 0.4);
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-cold-white);
}

ul,
ol {
  list-style: none;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--color-signal-cyan);
}

/* Accessibility: skip link is the first focusable element */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-2);
  z-index: 100;
  padding: var(--space-1) var(--space-2);
  background: var(--color-deep-space);
  color: var(--color-cold-white);
  border: 1px solid var(--color-signal-cyan);
  border-radius: var(--radius-card);
}

.skip-link:focus {
  top: var(--space-2);
}

/* Visible keyboard focus everywhere (design system §17) */
:focus-visible {
  outline: 2px solid var(--color-signal-cyan);
  outline-offset: 2px;
}

/* Layout shell */
.container {
  width: 100%;
  max-width: var(--max-content-width);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

/* Section rhythm: 64–80px mobile, scaled up at wider viewports */
.page-section {
  padding-block: var(--space-8);
}

@media (min-width: 768px) {
  .page-section {
    padding-block: var(--space-12);
  }
}

@media (min-width: 1280px) {
  .page-section {
    padding-block: var(--space-15);
  }
}

/* Static-first motion policy: only hover/focus transitions exist.
   Under reduced motion, make everything instant and disable smooth scroll. */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation: none !important;
  }
}