/* ============================================================
   BASE — reset, elements, layout primitives, a11y
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scrollbar-color: var(--surface-3) transparent;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

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

body.is-locked { overflow: hidden; }

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

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
input, textarea, select { font: inherit; color: inherit; }
ul[role="list"], ol[role="list"] { list-style: none; padding: 0; }

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

/* ---------- Headings ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--text);
}
h3, h4 { line-height: var(--lh-snug); }

/* ---------- Focus visibility ---------- */
:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 3px;
  border-radius: 4px;
}
:focus:not(:focus-visible) { outline: none; }
/* Route-change focus targets (programmatic) must not show a ring */
[tabindex="-1"]:focus { outline: none; }

/* ---------- Skip link ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: var(--z-modal);
  padding: 10px 18px;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: var(--r-pill);
  font-weight: 600;
  transform: translateY(-160%);
  transition: transform var(--dur-2) var(--ease-out);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- Screen-reader only ---------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Layout primitives ---------- */
.container { width: var(--container); margin-inline: auto; }
.container--wide { width: var(--container-wide); margin-inline: auto; }

.section {
  position: relative;
  padding-block: var(--section-pad-y);
}

/* ---------- Background scene (fixed, behind everything) ---------- */
.bg-scene {
  position: fixed;
  inset: 0;
  z-index: var(--z-bg);
  pointer-events: none;
  overflow: hidden;
}
.bg-scene__gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 80% at 50% -10%, rgba(53,224,196,0.06), transparent 55%),
    radial-gradient(90% 60% at 85% 8%, rgba(124,108,245,0.05), transparent 60%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg) 30%, var(--bg) 100%);
}
.bg-scene__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--hairline) 1px, transparent 1px),
    linear-gradient(90deg, var(--hairline) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(100% 60% at 50% 0%, #000 0%, transparent 70%);
  opacity: 0.35;
}
.bg-scene__grain {
  position: absolute;
  inset: -50%;
  width: 200%; height: 200%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  opacity: 0.035;
  mix-blend-mode: overlay;
}
/* A soft accent orb that drifts with scroll (set via JS custom prop) */
.bg-scene__orb {
  position: absolute;
  top: 12%; left: 50%;
  width: 46vw; height: 46vw;
  max-width: 720px; max-height: 720px;
  transform: translate(-50%, var(--orb-shift, 0));
  background: radial-gradient(circle, rgba(53,224,196,0.10), transparent 62%);
  filter: blur(30px);
  will-change: transform;
}

/* ---------- Utility text ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
}
.eyebrow::before {
  content: "";
  width: 26px; height: 1px;
  background: var(--accent-line);
}
.lead { font-size: var(--fs-lead); color: var(--text-dim); max-width: var(--measure); line-height: 1.55; }
.text-dim { color: var(--text-dim); }
.text-accent { color: var(--accent); }
.mono { font-family: var(--font-mono); }