/* ==========================================================================
   Standby — Base: reset, document, typography defaults, atmosphere
   ========================================================================== */

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

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scrollbar-color: var(--color-surface-3) transparent;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-soft);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "cv11", "ss01";
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Atmospheric backdrop: aurora mesh + grain, fixed behind everything */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: var(--z-bg);
  pointer-events: none;
  background:
    radial-gradient(60% 50% at 50% -10%, oklch(84% 0.18 152 / 0.14), transparent 70%),
    radial-gradient(40% 40% at 85% 10%, oklch(82% 0.13 210 / 0.1), transparent 70%),
    radial-gradient(50% 50% at 10% 30%, oklch(72% 0.16 290 / 0.08), transparent 70%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: var(--z-bg);
  pointer-events: none;
  opacity: 0.04;
  mix-blend-mode: overlay;
  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='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

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;
  padding: 0;
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: var(--signal);
  color: var(--text-on-signal);
}

/* ---- Headings ---- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--text);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

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

code,
kbd {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* ---- Utility helpers ---- */
.u-mono {
  font-family: var(--font-mono);
}

.u-signal {
  color: var(--signal);
}

.u-gradient-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.u-signal-text {
  background: var(--grad-signal);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

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

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -120px;
  z-index: var(--z-overlay);
  background: var(--signal);
  color: var(--text-on-signal);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-pill);
  font-weight: 600;
  transition: top var(--duration-fast) var(--ease-out-expo);
}

.skip-link:focus {
  top: var(--space-4);
}