/* APX marketing site — design system. Dark-only "sports-lab" theme. */
:root {
  --bg: #0a0a0c;
  --surface: #131318;
  --line: rgba(255, 255, 255, .08);
  --fg: #f2f2f0;
  --muted: #a8a8b0;
  --red: #ff1c00;
  --amber: #ff7a00;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --nav-h: 3.5rem; /* fixed-nav height — content clears this */
  --gap-block: 2rem; /* intro → first content block, shared across pages */
  color-scheme: dark;
  caret-color: var(--red);
  accent-color: var(--red);
}

* { box-sizing: border-box; }

html { overflow-x: clip; scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--fg);
  font: 16px/1.6 var(--font-body);
  /* graph-paper grid — the lab canvas */
  background-image:
    linear-gradient(rgba(255, 255, 255, .03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .03) 1px, transparent 1px);
  background-size: 48px 48px;
}

::selection { background: var(--red); color: #fff; }

.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;
}

/* ── Layout primitives ── */
.section { padding: clamp(4rem, 10vw, 7rem) clamp(1.25rem, 5vw, 2rem); }
/* First section on interior pages: clear the fixed nav, then scale the
   breathing room responsively (replaces a fixed per-page top padding). */
.section--top { padding-top: calc(var(--nav-h) + clamp(2.5rem, 6vw, 4.5rem)); }
.wrap { max-width: 1100px; margin-inline: auto; }
.wrap--narrow { max-width: 720px; margin-inline: auto; }

.microlabel {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--muted);
}
.microlabel::before { content: '// '; content: '// ' / ''; color: var(--red); }

.heading {
  margin: 0 0 1.25rem;
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.08;
}
.prose {
  margin: 0;
  font-size: clamp(1rem, .9rem + .5vw, 1.125rem);
  color: var(--muted);
  line-height: 1.75;
  max-width: 62ch;
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: .65rem 1.4rem;
  background: var(--red);
  color: #fff;
  border: none;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: box-shadow 150ms ease, transform 150ms ease;
}
.btn:hover { box-shadow: 0 0 24px rgba(255, 28, 0, .45); transform: translateY(-1px); }
.btn:focus-visible { outline: 2px solid var(--red); outline-offset: 3px; }

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0;
  inset-inline: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(10, 10, 12, .8);
  backdrop-filter: blur(12px) saturate(1.2);
  -webkit-backdrop-filter: blur(12px) saturate(1.2);
  border-bottom: 1px solid var(--line);
}
.nav__brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  line-height: 0;
}
.nav__brand img {
  height: 1.5rem;
  width: auto;
  display: block;
}
.nav__menu {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2rem);
}
.nav__links {
  display: flex;
  gap: clamp(.9rem, 2.5vw, 2rem);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__link {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 150ms ease;
}
.nav__link:hover { color: var(--fg); }
.nav__link[aria-current="page"] { color: var(--fg); border-bottom: 1px solid var(--red); padding-bottom: 2px; }
.nav__cta { padding: .45rem .9rem; font-size: .68rem; }

/* Hamburger toggle — hidden on desktop, revealed on narrow screens */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin: -.4rem -.6rem -.4rem 0; /* keep the 44px tap target without bloating the bar */
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
}
.nav__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  margin-inline: auto;
  background: var(--fg);
  transition: transform 200ms ease, opacity 150ms ease;
}
.nav__toggle:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; border-radius: 4px; }
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 640px) {
  .nav__toggle { display: flex; }
  .nav__menu {
    position: absolute;
    top: 100%;
    inset-inline: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: .5rem clamp(1rem, 4vw, 2.5rem) 1.25rem;
    background: rgba(10, 10, 12, .97);
    backdrop-filter: blur(12px) saturate(1.2);
    -webkit-backdrop-filter: blur(12px) saturate(1.2);
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 200ms ease, transform 200ms ease, visibility 200ms;
  }
  .nav[data-open] .nav__menu {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  .nav__links { flex-direction: column; gap: 0; width: 100%; }
  .nav__link {
    display: block;
    padding: .9rem .15rem;
    font-size: .82rem;
    border-bottom: 1px solid var(--line);
  }
  .nav__link[aria-current="page"] { padding-bottom: .9rem; border-bottom-color: var(--red); }
  .nav__cta { display: block; margin-top: 1rem; padding: .8rem 1rem; text-align: center; font-size: .74rem; }
}
@media (prefers-reduced-motion: reduce) {
  .nav__menu, .nav__toggle-bar { transition: none; }
}

/* ── Cards (crosshair corners) ── */
.card {
  position: relative;
  padding: 1.75rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--line);
  transition: border-color 200ms ease, box-shadow 200ms ease;
  color: inherit;
  text-decoration: none;
}
.card::before,
.card::after {
  content: '+';
  content: '+' / '';
  position: absolute;
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--muted);
  line-height: 1;
}
.card::before { top: -7px; left: -5px; }
.card::after { bottom: -7px; right: -5px; }
.card:hover { border-color: rgba(255, 28, 0, .5); box-shadow: 0 0 32px rgba(255, 28, 0, .12); }
.card:focus-visible { outline: 2px solid var(--red); outline-offset: 3px; }
.card a { color: inherit; text-decoration: none; }
.card__title {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.card__body { margin: 0; font-size: .9rem; color: var(--muted); line-height: 1.6; }

/* ── Stats ── */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  text-align: center;
}
.stat__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 600;
  color: var(--amber);
  line-height: 1;
  letter-spacing: -.02em;
}
.stat__label {
  display: block;
  margin-top: .5rem;
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}
@media (max-width: 480px) {
  .stats { grid-template-columns: 1fr; gap: 1.25rem; }
}

/* ── Readout list (mono key/value rows) ── */
.readout { list-style: none; margin: 0; padding: 0; font-family: var(--font-mono); }
.readout li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .55rem 0;
  border-bottom: 1px dashed var(--line);
  font-size: .78rem;
  letter-spacing: .05em;
}
.readout__key { color: var(--muted); text-transform: uppercase; }
.readout__val { color: var(--fg); text-align: right; }

/* ── Waitlist CTA band + email form ── */
.cta-band {
  border-top: none;
  background:
    radial-gradient(ellipse 75% 90% at 50% 50%, rgba(255, 80, 50, .30), transparent 70%),
    linear-gradient(rgba(0, 0, 0, .18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, .18) 1px, transparent 1px),
    #d91800;
  background-size: 100% 100%, 48px 48px, 48px 48px, 100% 100%;
  text-align: center;
}
.cta-band__inner { display: grid; gap: 1.1rem; place-items: center; }
.cta-band .heading { margin-bottom: 0; color: #fff; }
.cta-band__sub { margin: 0; font-size: .95rem; color: rgba(255, 255, 255, .75); max-width: 40ch; }
.cta-band .microlabel { color: rgba(255, 255, 255, .6); }
.cta-band .microlabel::before { color: rgba(255, 255, 255, .35); }
.cta-band .email-input {
  background: rgba(0, 0, 0, .28);
  border-color: rgba(255, 255, 255, .25);
  color: #fff;
}
.cta-band .email-input::placeholder { color: rgba(255, 255, 255, .4); opacity: 1; }
.cta-band .email-input:focus { border-color: rgba(255, 255, 255, .7); }
.cta-band .email-input:focus-visible { outline-color: rgba(255, 255, 255, .5); }
.cta-band .email-btn { background: #0a0a0c; color: #fff; }
.cta-band .email-btn:hover { box-shadow: 0 0 28px rgba(0, 0, 0, .55); }
.cta-band .email-error { color: #fff; }
.cta-band .email-confirm__msg { color: rgba(255, 255, 255, .75); }
.cta-band .email-confirm__msg::before { color: rgba(255, 255, 255, .5); }
.cta-band .email-confirm__addr { color: #fff; }

.email-form { display: flex; gap: .45rem; width: min(360px, 90vw); transition: opacity 200ms ease; }
.email-form.is-loading { opacity: .6; pointer-events: none; }
.email-input {
  flex: 1;
  min-width: 0;
  padding: .6rem .8rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: .8rem;
  transition: border-color 150ms ease;
}
.email-input::placeholder { color: var(--muted); opacity: 1; }
.email-input:focus { border-color: var(--red); }
.email-input:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }
.email-btn { white-space: nowrap; }
.email-error { margin: 0; font-family: var(--font-mono); font-size: .75rem; color: var(--red); }
.email-error[hidden] { display: none; }
.email-confirm {
  display: grid;
  gap: .2rem;
  place-items: center;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 300ms ease, transform 300ms ease;
  pointer-events: none;
  font-family: var(--font-mono);
}
.email-confirm.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.email-confirm__msg { margin: 0; font-size: .78rem; color: var(--muted); letter-spacing: .1em; text-transform: uppercase; }
.email-confirm__msg::before { content: '[OK] '; color: var(--red); }
.email-confirm__addr { margin: 0; font-size: .78rem; color: var(--red); }
@media (max-width: 420px) {
  .email-form { flex-direction: column; }
  .email-btn { width: 100%; }
}

/* ── VALD badge ── */
.vald-badge { display: flex; flex-direction: column; align-items: center; gap: .5rem; }
.vald-badge__label {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}
.vald-badge__logo { height: 26px; width: auto; }
/* Left-aligned variant used inline within prose sections (e.g. About) */
.vald-badge--start { align-items: flex-start; margin-bottom: 1rem; }

/* ── Footer ── */
.site-footer {
  display: grid;
  gap: .6rem;
  place-items: center;
  text-align: center;
  padding: 2rem 1.5rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .06em;
  color: var(--muted);
  border-top: 1px solid var(--line);
}
.site-footer p { margin: 0; }
.site-footer a { color: var(--muted); text-decoration: none; transition: color 150ms ease; }
.site-footer a:hover { color: var(--fg); }
.site-footer a:focus-visible { outline: 2px solid var(--red); outline-offset: 3px; border-radius: 2px; }

/* ── Home: hero ── */
.hero {
  min-height: 100dvh;
  display: grid;
  grid-template-rows: 1fr auto;
  padding-top: 4rem;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.hero-inner {
  display: grid;
  place-items: center;
  align-content: center;
  gap: clamp(2rem, 3vw, 3rem);
  padding: clamp(2rem, 5vw, 4rem) 1.5rem;
}
.apx-logo { color: var(--fg); width: min(540px, 82vw); height: auto; }
.hero-text { display: grid; gap: 1rem; place-items: center; text-align: center; }
.tagline {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(.7rem, .55rem + .5vw, .9rem);
  letter-spacing: .45em;
  text-indent: .45em;
  text-transform: uppercase;
  font-weight: 600;
  animation: apx-rise 700ms cubic-bezier(.2, .8, .2, 1) 1500ms both;
}
.location {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(.8rem, .7rem + .4vw, .95rem);
  color: var(--muted);
  animation: apx-rise 700ms cubic-bezier(.2, .8, .2, 1) 1700ms both;
}
.hero-cta { margin-top: .75rem; animation: apx-rise 700ms cubic-bezier(.2, .8, .2, 1) 1900ms both; }
@keyframes apx-rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .tagline, .location, .hero-cta { animation: none; }
}
#waitlist { scroll-margin-top: calc(var(--nav-h) + .75rem); }

/* ── Home: sections ── */
.numbers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: var(--gap-block);
}
.proof { display: grid; gap: 2rem; justify-items: center; text-align: center; }
.proof .prose { text-align: center; }
.proof .stats { width: 100%; }
@media (max-width: 900px) {
  .numbers-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .tech-grid { grid-template-columns: 1fr; }
}

/* ── Testing: device explorer ── */
.explorer__tabs { display: none; }
.explorer { margin-top: var(--gap-block); }
.explorer--tabbed .explorer__tabs {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  margin-bottom: var(--gap-block);
}
.explorer__tab {
  padding: .55rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 150ms ease, border-color 150ms ease;
}
.explorer__tab:hover { color: var(--fg); }
.explorer__tab[aria-selected="true"] { color: var(--fg); border-color: var(--red); }
.explorer__tab:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }

.device {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
  padding-block: 2.5rem;
}
.device[hidden] { display: none; }
.explorer:not(.explorer--tabbed) .device + .device { border-top: 1px solid var(--line); }
.device__art { width: 100%; height: auto; max-width: 420px; justify-self: center; }
.device__art--photo { max-width: 480px; mix-blend-mode: lighten; }
.device__measures { margin-top: 1.5rem; }
/* "Why it matters" note that trails the measures list in each device panel */
.device__measures + .prose { margin-top: 1.5rem; }
.device__svgnum { font-family: var(--font-mono); font-size: 13px; font-weight: 600; }
.device__time { font-family: var(--font-mono); font-size: 34px; font-weight: 600; fill: var(--red); }
@media (max-width: 900px) {
  .device { grid-template-columns: 1fr; }
}

/* ── About ── */
.who-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: var(--gap-block);
}
.timeline { list-style: none; margin: var(--gap-block) 0 0; padding: 0; font-family: var(--font-mono); }
.timeline li {
  display: flex;
  gap: 1.5rem;
  padding: 1rem 0;
  border-bottom: 1px dashed var(--line);
  font-size: .85rem;
  letter-spacing: .04em;
}
.timeline .when { color: var(--red); font-weight: 600; min-width: 5ch; }
.timeline .what { color: var(--muted); }
@media (max-width: 700px) {
  .who-grid { grid-template-columns: 1fr; }
}

/* ── FAQ ── */
.faq-list { margin-top: var(--gap-block); }
.faq-item { border-top: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 1.15rem 0;
  font-size: clamp(.9rem, .8rem + .4vw, 1.05rem);
  font-weight: 500;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: .75rem;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  content: '+' / '';
  flex-shrink: 0;
  font-family: var(--font-mono);
  color: var(--red);
}
.faq-item[open] summary::after { content: '−'; content: '−' / ''; }
.faq-answer { margin: 0 0 1.15rem; font-size: .92rem; color: var(--muted); line-height: 1.7; max-width: 65ch; }

/* ── Training: loop steps ── */
.loop-steps { display: grid; gap: 0; }
.loop-step {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: .9rem 0;
  border-bottom: 1px dashed var(--line);
}
.loop-step:first-child { border-top: 1px dashed var(--line); }
.loop-step__n {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 600;
  color: var(--red);
  letter-spacing: .1em;
  min-width: 2.2ch;
  padding-top: .15rem;
}
.loop-step__n--end { color: var(--amber); }
.loop-step__title {
  display: block;
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--fg);
  margin-bottom: .25rem;
}
.loop-step__detail { margin: 0; font-size: .85rem; color: var(--muted); line-height: 1.5; }

/* ── Training: format cards + targets readout ── */
.training-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: var(--gap-block);
}
.targets-readout { margin-top: 0; }
@media (max-width: 900px) {
  .training-grid { grid-template-columns: 1fr; }
  .targets-readout { margin-top: 1.5rem; }
}