/* ==========================================================================
   Base: reset, typography, layout primitives, aurora background
   ========================================================================== */

*, *::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) + var(--demo-bar-h) + 16px);
}

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

img, svg, video { display: block; max-width: 100%; }
/* Default size for inline icons; components size their own icons more specifically. */
svg:not([class]) { width: 1.15em; height: 1.15em; flex: none; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--brand-primary); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

h1, h2, h3, h4, h5 {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-display);
  line-height: var(--lh-heading);
  letter-spacing: var(--ls-heading);
  font-weight: var(--fw-bold);
  color: var(--text);
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: 1rem; }
p { margin: 0 0 var(--sp-4); color: var(--text-2); }

.display {
  font-size: var(--fs-display);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-display);
  font-weight: var(--fw-black);
}
.lead { font-size: var(--fs-body-lg); color: var(--text-2); }
.caption { font-size: var(--fs-caption); color: var(--text-3); }
.label {
  font-size: var(--fs-label);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--text-3);
}
.muted { color: var(--text-3); }
.text-gradient {
  background: var(--gradient-aurora);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.mono { font-family: var(--font-mono); font-size: .92em; }
.nowrap { white-space: nowrap; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---- Focus (always visible for keyboard users) ---- */
:focus { outline: none; }
:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 6px;
}

/* Programmatic focus targets (route changes) don't need a visible ring */
[tabindex="-1"]:focus, [tabindex="-1"]:focus-visible { outline: none; }

.sr-only {
  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: fixed;
  top: 8px; left: 8px;
  z-index: 1000;
  padding: .6rem 1rem;
  border-radius: var(--r-sm);
  background: var(--text);
  color: var(--bg);
  transform: translateY(-160%);
  transition: transform var(--dur) var(--ease-out);
}
.skip-link:focus { transform: translateY(0); }

/* ---- Layout primitives ---- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: var(--section-y); position: relative; }
.section-tight { padding-block: calc(var(--section-y) * .6); }
.section-head {
  max-width: 720px;
  margin: 0 auto var(--sp-10);
  text-align: center;
}
.section-head.left { margin-left: 0; text-align: left; }
.section-head p { font-size: var(--fs-body-lg); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: var(--sp-3);
  padding: .3rem .8rem;
  border-radius: var(--r-pill);
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  letter-spacing: .02em;
  color: var(--brand-primary);
  background: rgba(var(--brand-primary-rgb), .1);
  border: 1px solid rgba(var(--brand-primary-rgb), .2);
}
[data-theme="dark"] .eyebrow { color: #7DD3FC; }

.grid { display: grid; gap: var(--sp-6); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-fit { grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr)); }
.stack { display: flex; flex-direction: column; gap: var(--sp-4); }
.row { display: flex; align-items: center; gap: var(--sp-3); flex-wrap: wrap; }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); flex-wrap: wrap; }
.spacer { flex: 1; }
.center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-4 { margin-top: var(--sp-4); }
.mt-8 { margin-top: var(--sp-8); }

/* ---- Aurora background (single fixed layer, GPU-friendly) ---- */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background: var(--bg);
}
.aurora::before,
.aurora::after {
  content: "";
  position: absolute;
  width: 70vmax;
  height: 70vmax;
  border-radius: 50%;
  filter: blur(80px);
  opacity: .32;
  will-change: transform;
}
.aurora::before {
  top: -30vmax; left: -15vmax;
  background: radial-gradient(circle at 30% 30%, rgba(var(--brand-primary-rgb), .9), rgba(var(--brand-accent-rgb), .45) 45%, transparent 70%);
  animation: aurora-drift-a 26s ease-in-out infinite alternate;
}
.aurora::after {
  top: -10vmax; right: -25vmax;
  background: radial-gradient(circle at 60% 40%, rgba(var(--brand-secondary-rgb), .85), rgba(var(--brand-primary-rgb), .25) 50%, transparent 72%);
  animation: aurora-drift-b 32s ease-in-out infinite alternate;
}
[data-theme="dark"] .aurora::before,
[data-theme="dark"] .aurora::after { opacity: .28; }
.aurora .grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 65%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 65%);
  opacity: .55;
}

@keyframes aurora-drift-a { to { transform: translate3d(12vmax, 8vmax, 0) scale(1.1); } }
@keyframes aurora-drift-b { to { transform: translate3d(-10vmax, 12vmax, 0) scale(.95); } }

/* ---- Reduced motion: honour OS setting and the in-app setting ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}
:root[data-motion="reduced"] *,
:root[data-motion="reduced"] *::before,
:root[data-motion="reduced"] *::after {
  animation-duration: .001ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: .001ms !important;
}
:root[data-motion="reduced"] { scroll-behavior: auto; }

/* Reveal-on-scroll (progressive: content is visible if JS/IO unavailable) */
.reveal { opacity: 1; transform: none; }
.js-reveal .reveal:not(.is-visible) { opacity: 0; transform: translateY(18px); }
.js-reveal .reveal { transition: opacity .6s var(--ease-out), transform .6s var(--ease-out); }
:root[data-motion="reduced"] .js-reveal .reveal:not(.is-visible) { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js-reveal .reveal:not(.is-visible) { opacity: 1; transform: none; }
}

::selection { background: rgba(var(--brand-primary-rgb), .25); }