/* =============================================================
   BASE.CSS — Reset + foundational typography
   ============================================================= */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@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;
  }
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  transition: background var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out);
}

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

a { color: inherit; text-decoration: none; }

ul, ol { list-style: none; padding: 0; }

button, input, textarea, select {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
}
button { cursor: pointer; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
}

::selection {
  background: color-mix(in srgb, var(--accent-violet) 55%, transparent);
  color: #fff;
}

/* ─── Focus states — visible + on-brand ─────────────────── */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ─── Scrollbar ──────────────────────────────────────────── */
html { 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-full);
  border: 2px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover { background: var(--accent-violet); }

/* ─── Skip link ──────────────────────────────────────────── */
.skip-link {
  position: fixed;
  top: -100px;
  left: var(--sp-sm);
  z-index: 10001;
  background: var(--accent-cyan);
  color: #04110e;
  padding: 0.6rem 1.1rem;
  border-radius: var(--r-sm);
  font-weight: 600;
  font-size: var(--fs-sm);
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: var(--sp-sm); }

/* ─── Film-grain overlay (subtle texture over everything) ── */
.grain-overlay {
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  opacity: var(--grain-opacity);
  mix-blend-mode: overlay;
  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)'/%3E%3C/svg%3E");
}

/* ─── Ambient background canvas ─────────────────────────── */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: var(--z-bg);
  pointer-events: none;
}

.page-shell {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main { flex: 1; }

/* ─── Common text utilities ──────────────────────────────── */
.text-gradient {
  background: var(--gradient-brand);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradient-shift 8s ease infinite;
}
@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.mono { font-family: var(--font-mono); }

.error-state {
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  padding: var(--sp-md) 0;
}

@media (prefers-reduced-motion: reduce) {
  .text-gradient { animation: none; }
}