/* ============================================================
   RHYNO DRONE — BASE / RESET / GLOBAL ATMOSPHERE
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scrollbar-color: var(--carbon-500) var(--carbon-900);
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--text);
  background: var(--carbon-900);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  position: relative;
}

/* Atmospheric base: topographic grid + radial wash + grain */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1100px 700px at 78% -10%, var(--signal-wash), transparent 60%),
    radial-gradient(900px 600px at 0% 100%, rgba(70, 227, 207, 0.05), transparent 55%),
    linear-gradient(180deg, var(--carbon-950), var(--carbon-900) 40%, var(--carbon-850));
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 30%, transparent 90%);
          mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 30%, transparent 90%);
}

img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }
ul, ol { list-style: none; }
input, textarea, select { font: inherit; color: inherit; }

::selection { background: var(--signal); color: var(--carbon-950); }

/* Scrollbar (webkit) */
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--carbon-900); }
::-webkit-scrollbar-thumb { background: var(--carbon-500); border: 3px solid var(--carbon-900); }
::-webkit-scrollbar-thumb:hover { background: var(--signal-deep); }

/* Focus visibility */
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

/* --- Layout primitives --- */
.shell { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(4rem, 8vw, 8rem); position: relative; }

/* --- Typography primitives --- */
.display {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--signal);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--signal);
}
.mono { font-family: var(--font-mono); }
.dim { color: var(--text-dim); }
.signal-text { color: var(--signal); }

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