*, *::before, *::after { box-sizing: border-box; }
html { background: var(--bg); scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 400 var(--fs-md)/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 500; line-height: 1.08; margin: 0; letter-spacing: -0.02em; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--radius-sm); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.wrap { width: min(100% - 2 * var(--gutter), var(--max)); margin-inline: auto; }
.section { padding-block: var(--sp-9); position: relative; }
.eyebrow {
  font: 500 var(--fs-xs)/1 var(--font-mono); letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--accent); display: inline-flex; align-items: center; gap: var(--sp-3);
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: currentColor; }
.section-head { display: grid; gap: var(--sp-4); max-width: 720px; margin-bottom: var(--sp-7); }
.section-head h2 { font-size: var(--fs-h2); }
.section-head p { color: var(--muted); font-size: var(--fs-lg); }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2);
  min-height: var(--tap); padding: 0 var(--sp-5); border-radius: var(--radius-sm);
  font-weight: 500; text-decoration: none; cursor: pointer; border: 1px solid transparent;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
}
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--glow); }
.btn-primary:hover { background: var(--accent-hover); color: var(--accent-ink); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--surface-hover); color: var(--fg); border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; box-shadow: none; }

.chip {
  min-height: var(--tap); padding: 0 var(--sp-4); border-radius: 999px; cursor: pointer;
  background: var(--surface); border: 1px solid var(--border); color: var(--fg);
  transition: background var(--t-fast), border-color var(--t-fast);
}
.chip:hover { background: var(--surface-hover); border-color: var(--border-strong); }
.chip[aria-pressed="true"], .chip[aria-selected="true"] { background: var(--accent-soft); border-color: var(--accent); color: var(--fg); }

/* scroll progress */
.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: calc(var(--z-nav) + 1); pointer-events: none;
  background: var(--neon); box-shadow: 0 0 10px var(--accent-glow); transform: scaleX(0); transform-origin: left;
}

/* nav */
.nav {
  position: fixed; inset: 0 0 auto; height: var(--nav-h); z-index: var(--z-nav);
  display: flex; align-items: center; transition: background var(--t-med), border-color var(--t-med);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled { background: oklch(0.120 0.034 250 / 0.82); backdrop-filter: blur(14px); border-color: var(--border); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-5); }
.brand { display: flex; align-items: center; gap: var(--sp-3); text-decoration: none; font: 400 var(--fs-md)/1 var(--font-display); letter-spacing: .12em; }
.brand img { width: 28px; height: auto; }
.nav-links { display: flex; gap: var(--sp-2); list-style: none; margin: 0; padding: 0; }
.nav-links a { display: inline-flex; align-items: center; min-height: var(--tap); padding: 0 var(--sp-3); text-decoration: none; color: var(--muted); font-size: var(--fs-sm); border-radius: var(--radius-sm); }
.nav-links a:hover { color: var(--fg); background: var(--surface); }
@media (max-width: 860px) { .nav-links { display: none; } }

/* reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

/* toast */
.toast {
  position: fixed; left: 50%; bottom: var(--sp-6); z-index: var(--z-toast);
  transform: translate(-50%, calc(100% + var(--sp-7))); opacity: 0; visibility: hidden;
  padding: var(--sp-3) var(--sp-5); border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--accent); color: var(--fg); box-shadow: var(--glow);
  font-size: var(--fs-sm); transition: transform var(--t-med) var(--ease), opacity var(--t-med), visibility 0s var(--t-med); max-width: calc(100% - 2 * var(--gutter)); text-align: center;
}
.toast.is-on { transform: translate(-50%, 0); opacity: 1; visibility: visible; transition-delay: 0s; }

/* footer */
.footer { position: relative; border-top: 1px solid var(--accent-soft); padding-block: var(--sp-5); font-size: var(--fs-xs); color: var(--muted); }
.footer::before { content: ""; position: absolute; inset: -1px 0 auto; height: 1px; background: var(--accent); opacity: .35; box-shadow: 0 0 12px var(--accent-glow); }
.footer .wrap { display: grid; grid-template-columns: 1fr auto 1fr; gap: var(--sp-4); align-items: center; }
.foot-brand { display: inline-flex; align-items: center; gap: var(--sp-2); min-height: var(--tap); text-decoration: none; color: var(--accent); font: 700 var(--fs-xs)/1 var(--font-body); letter-spacing: .17em; }
.m3ow { height: var(--m3ow-h); aspect-ratio: 42 / 12; fill: none; stroke: currentColor; stroke-width: var(--m3ow-stroke); stroke-linecap: square; stroke-linejoin: miter; filter: drop-shadow(0 0 2px var(--accent-glow)); }
.foot-brand:hover .m3ow { filter: drop-shadow(0 0 5px var(--accent-glow)); }
.foot-sync { letter-spacing: .1em; color: var(--muted); opacity: .85; }  /* .6 fell below 4.5:1 contrast */
.foot-sync span { color: var(--accent); }
.foot-end { display: flex; align-items: center; gap: var(--sp-1); justify-self: end; flex-wrap: wrap; }
.foot-end i { font-style: normal; opacity: .5; }
.footer a:not(.foot-brand) { display: inline-flex; align-items: center; min-height: var(--tap); padding: 0 var(--sp-1); color: var(--muted); text-decoration: none; }
.footer a:not(.foot-brand):hover { color: var(--fg); text-decoration: underline; }
@media (max-width: 700px) {
  .footer .wrap { grid-template-columns: 1fr; justify-items: center; text-align: center; gap: var(--sp-1); }
  .foot-brand, .foot-end { justify-self: center; justify-content: center; }
  /* Copyright gets its own line, so the separator before it would dangle at the row's end. */
  .foot-end i:last-of-type { display: none; }
  .foot-end > span:last-child { flex-basis: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 1ms !important; transition-duration: 1ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}

@keyframes pop { from { opacity: 0; transform: translateY(12px) scale(.97) } }