/* ==========================================================================
   Signal Verse AR — Base: reset, typography, layout primitives, utilities
   ========================================================================== */

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

* { margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-text);
  font-size: var(--fs-body);
  line-height: var(--lh-base);
  letter-spacing: var(--tracking-base);
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  min-height: 100svh;
  overflow-x: hidden;
  font-synthesis-weight: none;
  transition: background-color var(--dur-slow) var(--ease-standard),
              color var(--dur-slow) var(--ease-standard);
}

/* Page-level grain — one fixed layer, GPU friendly */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: var(--noise-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

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

img { background-color: var(--surface-muted); }

input, button, textarea, select {
  font: inherit;
  color: inherit;
  letter-spacing: inherit;
}

button { background: none; border: none; cursor: pointer; }

ul, ol { list-style: none; }

a {
  color: inherit;
  text-decoration: none;
  -webkit-touch-callout: none;
}

table { border-collapse: collapse; width: 100%; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin-block: var(--space-6);
}

::selection {
  background: var(--accent);
  color: #fff;
}

/* ---- Typography ---------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-tight);
  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-h4); }
h5 { font-size: var(--fs-callout); }
h6 { font-size: var(--fs-subhead); }

p { text-wrap: pretty; }

strong, b { font-weight: var(--fw-semibold); }

code, kbd, samp, pre { font-family: var(--font-mono); font-size: 0.92em; }

code:not(pre code) {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--r-xs);
  padding: 0.15em 0.42em;
  font-size: 0.86em;
  color: var(--accent);
}

/* ---- Layout primitives --------------------------------------------------- */

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

.container--wide { max-width: var(--max-width-wide); }
.container--narrow { max-width: 880px; }
.container--text { max-width: 760px; }

.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: clamp(3rem, 2rem + 4vw, 5.5rem); }
.section--flush-top { padding-top: 0; }
.section--flush-bottom { padding-bottom: 0; }
.section--sunken { background: var(--bg-sunken); }

.stack { display: flex; flex-direction: column; }
.stack-2 > * + * { margin-top: var(--space-2); }
.stack-3 > * + * { margin-top: var(--space-3); }
.stack-4 > * + * { margin-top: var(--space-4); }
.stack-5 > * + * { margin-top: var(--space-5); }
.stack-6 > * + * { margin-top: var(--space-6); }
.stack-8 > * + * { margin-top: var(--space-8); }

.row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.row--between { justify-content: space-between; }
.row--center { justify-content: center; }
.row--top { align-items: flex-start; }

.grid { display: grid; gap: var(--space-5); }
.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-auto { grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr)); }
.grid-auto-sm { grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr)); }
.grid-auto-lg { grid-template-columns: repeat(auto-fit, minmax(min(360px, 100%), 1fr)); }

@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---- Section headings ---------------------------------------------------- */

.section-head {
  max-width: 760px;
  margin-bottom: var(--space-8);
}
.section-head--center {
  margin-inline: auto;
  text-align: center;
}
.section-head__title {
  font-size: var(--fs-h2);
  letter-spacing: var(--tracking-display);
  margin-top: var(--space-4);
}
.section-head__lede {
  font-size: var(--fs-lead);
  color: var(--text-secondary);
  line-height: var(--lh-loose);
  margin-top: var(--space-4);
  letter-spacing: var(--tracking-base);
}

/* ---- Type utilities ------------------------------------------------------ */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.5;
}
.eyebrow--plain::before { display: none; }

.display-1 {
  font-family: var(--font-display);
  font-size: var(--fs-display-1);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-display);
}
.display-2 {
  font-family: var(--font-display);
  font-size: var(--fs-display-2);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-display);
}

.lede {
  font-size: var(--fs-lead);
  line-height: var(--lh-loose);
  color: var(--text-secondary);
}

.text-secondary { color: var(--text-secondary); }
.text-tertiary  { color: var(--text-tertiary); }
.text-accent    { color: var(--accent); }
.text-success   { color: var(--success); }
.text-center    { text-align: center; }
.text-balance   { text-wrap: balance; }
.text-mono      { font-family: var(--font-mono); }
.fs-footnote    { font-size: var(--fs-footnote); }
.fs-subhead     { font-size: var(--fs-subhead); }
.fs-caption     { font-size: var(--fs-caption); }
.fw-semibold    { font-weight: var(--fw-semibold); }

.gradient-text {
  background: linear-gradient(103deg, var(--accent) 0%, var(--cyan) 48%, var(--success) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.measure { max-width: var(--max-width-text); }

/* ---- Spacing utilities --------------------------------------------------- */

.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-9 { margin-top: var(--space-9); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* ---- Accessibility ------------------------------------------------------- */

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

:focus-visible {
  outline: 3px solid var(--accent-ring);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}
:focus:not(:focus-visible) { outline: none; }

.skip-link {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: var(--z-splash);
  padding: var(--space-3) var(--space-5);
  background: var(--accent);
  color: #fff;
  border-radius: var(--r-pill);
  font-size: var(--fs-subhead);
  font-weight: var(--fw-semibold);
  box-shadow: var(--shadow-4);
  transform: translateY(-160%);
  transition: transform var(--dur-base) var(--ease-spring);
}
.skip-link:focus { transform: translateY(0); }

/* ---- Scrollbar ----------------------------------------------------------- */

@media (pointer: fine) {
  * { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
  ::-webkit-scrollbar { width: 10px; height: 10px; }
  ::-webkit-scrollbar-track { background: transparent; }
  ::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: var(--r-pill);
    border: 3px solid var(--bg);
  }
  ::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }
}

/* ---- Reduced motion ------------------------------------------------------ */

@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;
    scroll-behavior: auto !important;
  }
}

html[data-motion="reduced"] * ,
html[data-motion="reduced"] *::before,
html[data-motion="reduced"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
}

/* ---- Print --------------------------------------------------------------- */

@media print {
  .site-nav, .site-footer, .sv-cursor, .splash, .scroll-progress { display: none !important; }
  body { background: #fff; color: #000; }
  .reveal { opacity: 1 !important; transform: none !important; }
}