/* ==========================================================================
   MPN — Base: reset, elements, layout primitives, typography, utilities
   ========================================================================== */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

body.is-locked { overflow: hidden; }

img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }

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

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

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

main:focus { outline: none; }

/* --- Skip link ----------------------------------------------------------- */
[id] { scroll-margin-top: calc(var(--nav-h) + 24px); }

.skip-link {
  position: fixed;
  top: 0; left: 50%;
  transform: translate(-50%, -120%);
  z-index: 200;
  background: var(--accent-fill);
  color: var(--on-accent);
  font-size: var(--fs-caption);
  font-weight: 700;
  letter-spacing: var(--tracking-btn);
  text-transform: uppercase;
  padding: 14px 22px;
  min-height: var(--tap);
  display: inline-flex;
  align-items: center;
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); }

/* --- Prototype flag ------------------------------------------------------ */
.build-flag {
  position: relative;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  text-align: center;
  padding: 9px var(--space-4);
  background: var(--bg-sunken);
  border-bottom: 1px solid var(--hairline);
  color: var(--fg-quiet);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  line-height: 1.4;
}
.build-flag em { color: var(--fg-muted); font-style: normal; }
.build-flag__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-fill);
  flex: none;
}

/* --- Layout primitives --------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: calc(var(--maxw) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: calc(880px + var(--gutter) * 2); }

.section { padding-block: var(--section-y); }
.section--tight { padding-block: calc(var(--section-y) * 0.62); }
.section--raised { background: var(--bg-raised); }
.section + .section { border-top: 1px solid var(--hairline); }

.section__head { margin-bottom: var(--space-8); }
.section__head--split {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.stack > * + * { margin-top: var(--space-4); }
.hairline { height: 1px; background: var(--hairline); border: 0; margin: 0; }

/* --- Typography ---------------------------------------------------------- */
.display,
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.015em;
  text-wrap: balance;
  margin: 0;
}

h1, .t-h1 { font-size: var(--fs-h1); line-height: var(--lh-display); }
h2, .t-h2 { font-size: var(--fs-h2); line-height: var(--lh-h2); }
h3, .t-h3 { font-size: var(--fs-h3); line-height: var(--lh-h3); letter-spacing: -0.008em; }
.t-h4 { font-family: var(--font-display); font-size: var(--fs-h4); line-height: 1.2; margin: 0; }

p { margin: 0; }
p + p { margin-top: var(--space-4); }

.lede {
  font-size: var(--fs-lede);
  line-height: 1.5;
  color: var(--fg-muted);
  max-width: var(--measure-tight);
}
.prose { max-width: var(--measure); color: var(--fg-muted); }
.prose strong { color: var(--fg); font-weight: 600; }

.eyebrow {
  display: block;
  font-family: var(--font-body);
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--accent);
  margin: 0 0 var(--space-5);
}
.eyebrow--mute { color: var(--mute); }

.caption {
  font-size: var(--fs-caption);
  line-height: 1.55;
  color: var(--mute);
}

.label {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--mute);
}

.num { font-variant-numeric: tabular-nums lining-nums; }

/* --- Utilities ----------------------------------------------------------- */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.text-accent { color: var(--accent); }
.text-mute { color: var(--mute); }

/* --- Motion: fade + rise, and nothing else ------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(var(--reveal-travel));
  transition:
    opacity var(--dur-reveal) var(--ease),
    transform var(--dur-reveal) var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-revealed { opacity: 1; transform: none; }
.no-motion [data-reveal] { opacity: 1; transform: none; transition: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
}