/* ==========================================================================
   ENDLESS BELOW — reset, element defaults, atmosphere, utilities
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  /* Anchored patch-note / section links must clear the fixed header. */
  scroll-padding-top: calc(var(--header-h) + var(--sp-5));
}

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: 400;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.is-locked {
  overflow: hidden;
}

/* --- Atmospheric background layers ---------------------------------------
   Pure CSS: an abyssal glow from below, a cold shaft from above, a stone
   grain and a vignette. No image requests, so it never blocks paint.      */
.atmos {
  position: fixed;
  inset: 0;
  z-index: var(--z-atmos);
  pointer-events: none;
  overflow: hidden;
}

.atmos__glow {
  position: absolute;
  inset: -10% -10% -20%;
  background:
    radial-gradient(90% 55% at 50% 118%, rgba(111, 95, 184, 0.22), transparent 70%),
    radial-gradient(70% 40% at 18% 8%, rgba(79, 111, 159, 0.14), transparent 72%),
    radial-gradient(60% 45% at 88% 24%, rgba(111, 179, 192, 0.08), transparent 70%),
    linear-gradient(180deg, #080a0c 0%, #050506 55%, #030304 100%);
}

.atmos__grain {
  position: absolute;
  inset: 0;
  background-image: var(--noise);
  background-size: 160px 160px;
  opacity: 0.045;
  mix-blend-mode: overlay;
}

.atmos__vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    120% 85% at 50% 40%,
    transparent 40%,
    rgba(0, 0, 0, 0.55) 100%
  );
}

/* Slow drifting motes. Canvas is optional — JS skips it for reduced motion. */
.atmos__motes {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.55;
}

/* --- Typography ----------------------------------------------------------- */
h1,
h2,
h3,
h4 {
  margin: 0 0 var(--sp-4);
  font-family: var(--font-display);
  font-weight: 500;
  line-height: var(--lh-heading);
  color: var(--heading);
  letter-spacing: var(--ls-display);
  text-wrap: balance;
}

h1 {
  font-size: var(--fs-h1);
}
h2 {
  font-size: var(--fs-h2);
}
h3 {
  font-size: var(--fs-h3);
}
h4 {
  font-size: var(--fs-body);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--parchment-300);
}

p {
  margin: 0 0 var(--sp-4);
  max-width: var(--width-text);
}

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

a {
  color: var(--parchment-200);
  text-decoration-color: var(--rule-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition: color var(--dur-fast) var(--ease),
    text-decoration-color var(--dur-fast) var(--ease);
}

a:hover {
  color: var(--accent);
  text-decoration-color: currentColor;
}

strong {
  font-weight: 600;
  color: var(--parchment-100);
}

em {
  font-style: italic;
  color: var(--parchment-300);
}

ul,
ol {
  margin: 0 0 var(--sp-4);
  padding-left: 1.25em;
}

li {
  margin-bottom: var(--sp-2);
}

blockquote {
  margin: 0;
}

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

img {
  height: auto;
  border: 0;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

hr {
  height: 1px;
  margin: var(--sp-6) 0;
  border: 0;
  background: var(--rule);
}

::selection {
  background: rgba(111, 179, 192, 0.3);
  color: var(--parchment-100);
}

/* --- Focus ---------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Never remove focus rings; only hide them for mouse users. */
:focus:not(:focus-visible) {
  outline: none;
}

/* --- Utilities ------------------------------------------------------------ */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: 0;
  left: var(--sp-4);
  z-index: var(--z-overlay);
  padding: var(--sp-3) var(--sp-5);
  background: var(--panel-solid);
  border: var(--border-strong);
  color: var(--parchment-100);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  text-decoration: none;
  transform: translateY(-120%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

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

.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
}

.nowrap {
  white-space: nowrap;
}

/* Progressive enhancement: data-driven catalogues hide their JS-only
   surface when scripting is off, and vice versa. */
.js .no-js-only {
  display: none !important;
}

.no-js .js-only {
  display: none !important;
}

/* --- Reduced motion ------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .atmos__motes {
    display: none;
  }
}