/* ============================================================
   BASE — reset, root, typography foundation
   ============================================================ */

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  tab-size: 4;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--fg);
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  font-feature-settings: "ss01", "ss02", "cv11", "kern";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  /* `clip` is a cheaper version of `hidden` — it suppresses the same
     overflow without forcing a new scroll container. Falls back to
     `hidden` automatically on browsers that don't recognize it. */
  overflow-x: hidden;
  overflow-x: clip;
  /* Subtle warm vignette from a deep ember glow top-left and a
     cooler vacuum bottom-right — very low opacity, feels like room light.
     `background-attachment: fixed` is gated on hover-capable / large
     viewports only — on mobile (and especially older Android) it forces
     the browser to repaint both radial gradients on every scroll frame,
     which is the dominant scroll-perf cost on the page. */
  background:
    radial-gradient(ellipse at 8% -10%, oklch(0.30 0.07 45 / 0.28), transparent 55%),
    radial-gradient(ellipse at 105% 110%, oklch(0.20 0.04 25 / 0.30), transparent 60%),
    var(--ink-950);
}
@media (hover: hover) and (pointer: fine) and (min-width: 64rem) {
  body { background-attachment: fixed; }
}
.low-power body { background-attachment: scroll; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

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

/* ---------- TYPOGRAPHY DEFAULTS ---------- */

.display, h1, h2 {
  font-family: var(--font-display);
  color: var(--fg-strong);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-headline);
  font-feature-settings: "kern", "liga";
}

h1 { font-size: var(--text-display); letter-spacing: var(--tracking-mega); font-weight: 700; }
h2 { font-size: var(--text-4xl); font-weight: 600; }
h3 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: var(--tracking-snug);
  line-height: var(--leading-snug);
  color: var(--fg-strong);
}
h4 {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-snug);
  color: var(--fg-strong);
}

p {
  max-width: var(--max-measure);
  line-height: var(--leading-body);
}

/* ---------- UTILITIES ---------- */

.mono {
  font-family: var(--font-mono);
  font-feature-settings: "ss01", "zero", "calt";
  font-size: 0.92em;
  letter-spacing: -0.01em;
}

.label {
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--tracking-loud);
  text-transform: uppercase;
  color: var(--fg-muted);
  font-weight: 500;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--tracking-loud);
  text-transform: uppercase;
  color: var(--ember-400);
  font-weight: 500;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.hairline { border: 0; border-top: 1px solid var(--border); }

.focus-visible:focus-visible,
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--ember-500);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection {
  background: var(--ember-500);
  color: var(--ink-950);
}

/* ---------- SCROLLBAR (webkit only, subtle) ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--ink-800);
  border: 2px solid var(--ink-950);
  border-radius: 6px;
}
::-webkit-scrollbar-thumb:hover { background: var(--ink-700); }

/* ---------- MOBILE TEXT-RENDER BUDGET ----------
   `text-rendering: optimizeLegibility` enables full kerning and
   ligature lookups on every text node. On older Android GPUs this
   pushes per-paint cost up enough to be felt on scroll. The OpenType
   feature settings add per-glyph substitution work on top. We let
   the browser pick its own defaults on touch / small viewports. */
@media (pointer: coarse), (max-width: 48rem) {
  body {
    text-rendering: auto;
    font-feature-settings: normal;
  }
}
.low-power body {
  text-rendering: auto;
  font-feature-settings: normal;
}