/* ==========================================================================
   Base — reset, element defaults, utilities, accessibility helpers
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
  color-scheme: dark;
}

@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 {
  margin: 0;
  min-height: 100vh;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Page-wide ambient backdrop: faint grid + two restrained glows */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(60rem 36rem at 85% -10%, rgba(59, 130, 246, 0.16), transparent 60%),
    radial-gradient(40rem 30rem at -10% 20%, rgba(0, 212, 255, 0.08), transparent 60%),
    linear-gradient(rgba(148, 163, 184, 0.04) 1px, transparent 1px) 0 0 / 56px 56px,
    linear-gradient(90deg, rgba(148, 163, 184, 0.04) 1px, transparent 1px) 0 0 / 56px 56px,
    var(--color-bg);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 55%, rgba(0, 0, 0, 0.55) 100%);
  mask-image: linear-gradient(to bottom, #000 0%, #000 55%, rgba(0, 0, 0, 0.55) 100%);
}

img,
svg { display: block; max-width: 100%; }
svg { flex-shrink: 0; }

h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul[role="list"], ol[role="list"] { list-style: none; padding: 0; }

h1, h2, h3, h4 {
  line-height: var(--leading-tight);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}
a:hover { color: #7ee8ff; }

button { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection { background: rgba(0, 212, 255, 0.3); color: var(--color-text); }

/* ---------- Utilities ---------- */

.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: calc(var(--container-narrow) + var(--gutter) * 2); }

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

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--gutter);
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  background: var(--color-accent);
  color: var(--color-on-accent);
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
}
.skip-link:focus { top: var(--space-3); color: var(--color-on-accent); }

.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Scroll-reveal: only hide when JS confirmed it can reveal (html.js) */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
.js .reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce), print {
  .js .reveal { opacity: 1; transform: none; }
}