/* DJI Avata 2 concept landing. Tokens first, then layout, then components. */

@font-face {
  font-family: "Urbanist";
  src: url("fonts/urbanist-latin-var.woff2") format("woff2");
  font-weight: 300 600;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* Metric-matched fallback keeps line breaks close while the webfont swaps in. */
@font-face {
  font-family: "Urbanist Fallback";
  src: local("Arial"), local("Helvetica Neue"), local("Liberation Sans");
  size-adjust: 96%;
  ascent-override: 98%;
  descent-override: 26%;
  line-gap-override: 0%;
}

:root {
  color-scheme: dark;

  --bg: #000;
  --surface: #0a0b0d;
  --text-1: #f2f3f5;
  --text-2: rgb(242 243 245 / 0.74);
  --text-3: rgb(242 243 245 / 0.58);
  --line: rgb(255 255 255 / 0.08);
  --line-strong: rgb(255 255 255 / 0.18);
  --accent: #0070d5;
  --accent-text: #4da3ff;
  --glass: rgb(17 17 17 / 0.7);
  --glass-line: rgb(255 255 255 / 0.15);
  --focus: #6cb4ff;

  --font: "Urbanist", "Urbanist Fallback", system-ui, sans-serif;
  --fs-display: clamp(2.5rem, 1.7742rem + 3.2258vw, 5rem);
  --fs-h2: clamp(2rem, 1.4919rem + 2.2581vw, 3.75rem);
  --fs-h3: clamp(1.5rem, 1.2823rem + 0.9677vw, 2.25rem);
  --fs-big: clamp(2.5rem, 1.4839rem + 4.5161vw, 6rem);
  --fs-lede: clamp(1.125rem, 1.0524rem + 0.3226vw, 1.375rem);
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --fs-eyebrow: 0.8125rem;

  --gutter: clamp(1rem, 0.6rem + 1.8vw, 2.5rem);
  --header-h: 4.5rem;
  --section-pad: clamp(5rem, 3rem + 7vw, 10rem);
  --radius: 0.75rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --cols: 4;
}

@media (min-width: 48rem) { :root { --cols: 6; } }
@media (min-width: 80rem) { :root { --cols: 12; } }

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

html {
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-block-start: var(--header-h);
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

body {
  margin: 0;
  min-height: 100svh;
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--font);
  font-weight: 300;
  font-size: var(--fs-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

img, svg, canvas { display: block; max-inline-size: 100%; }
a { color: inherit; }
button { font: inherit; color: inherit; }
h1, h2, h3, p, dl, dd, ol, ul, figure { margin: 0; }
ol, ul { padding: 0; list-style: none; }
sup { font-size: max(0.75rem, 0.55em); line-height: 0; vertical-align: super; margin-inline-start: 0.1em; }
sup a { color: var(--text-3); text-decoration: none; display: inline-block; line-height: 1; padding: 0.5em 0.5em; margin: -0.5em -0.35em; }
sup a:hover { color: var(--text-1); }

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

.sr-only {
  position: absolute !important;
  inline-size: 1px; block-size: 1px;
  overflow: hidden; clip-path: inset(50%);
  white-space: nowrap; margin: -1px; padding: 0; border: 0;
}

.skip-link {
  position: fixed; inset-block-start: 0.75rem; inset-inline-start: 0.75rem; z-index: 100;
  padding: 0.75rem 1rem; background: var(--text-1); color: #000; font-weight: 500;
  border-radius: 0.5rem; transform: translateY(-200%); transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: none; }

/* ---------- Type ---------- */
.display, .h2, .h3 { font-weight: 400; text-wrap: balance; letter-spacing: -0.02em; }
.display { font-size: var(--fs-display); line-height: 1.02; }
.display--md { font-size: clamp(2.25rem, 1.6rem + 2.9vw, 4.5rem); }
.h2 { font-size: var(--fs-h2); line-height: 1.06; }
.h3 { font-size: var(--fs-h3); line-height: 1.12; }
.lede { font-size: var(--fs-lede); line-height: 1.5; color: var(--text-2); text-wrap: pretty; max-inline-size: 34rem; }
.body { color: var(--text-2); text-wrap: pretty; max-inline-size: 32rem; }
.muted { color: var(--text-3); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.625rem;
  font-size: var(--fs-eyebrow); font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--text-2); margin-block-end: 1.25rem;
}
.eyebrow--center { justify-content: center; }
.sq { inline-size: 0.375rem; block-size: 0.375rem; background: var(--accent); flex: none; }

.wrap { inline-size: min(100% - 2 * var(--gutter), 90rem); margin-inline: auto; }

/* ---------- Intro ---------- */
.intro {
  position: fixed; inset: 0; z-index: 90; display: grid; place-content: center; justify-items: center; gap: 2rem;
  background: #000; opacity: 0; visibility: hidden;
  transition: opacity 0.6s var(--ease), visibility 0s linear 0.6s;
}
.is-intro .intro {
  opacity: 1; visibility: visible; transition: none;
  animation: intro-failsafe 0.6s var(--ease) 3.5s forwards; /* if app.js never runs */
}
@keyframes intro-failsafe { to { opacity: 0; visibility: hidden; } }
.intro__mark { inline-size: 4.5rem; color: var(--text-1); }
.intro__bar { inline-size: 7.5rem; block-size: 1px; background: var(--line-strong); overflow: hidden; }
.intro__fill { display: block; block-size: 100%; background: var(--text-1); transform-origin: left; transform: scaleX(var(--load, 0)); transition: transform 0.3s linear; }
.is-intro body { overflow: hidden; }

/* ---------- Hairline column grid ---------- */
.hairlines {
  position: fixed; inset: 0; z-index: 2; pointer-events: none;
  padding-inline: var(--gutter);
  background-image: linear-gradient(to right, var(--line) 1px, transparent 1px);
  background-size: calc(100% / var(--cols)) 100%;
  background-origin: content-box; background-clip: content-box;
  border-inline-end: 1px solid transparent;
  opacity: 0.7;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset-block-start: 0; inset-inline: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  block-size: var(--header-h);
  padding-inline: var(--gutter);
  padding-block-start: env(safe-area-inset-top);
  background: linear-gradient(to bottom, rgb(0 0 0 / 0.72), rgb(0 0 0 / 0));
}
.brand { display: inline-flex; align-items: center; gap: 0.75rem; text-decoration: none; min-block-size: 2.75rem; }
.brand__mark { inline-size: 2.75rem; color: var(--text-1); }
.brand__product { font-size: var(--fs-small); font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-2); padding-inline-start: 0.75rem; border-inline-start: 1px solid var(--line-strong); }

.site-nav { position: absolute; inset-inline-start: 50%; transform: translateX(-50%); display: none; }
.site-nav ul { display: flex; gap: 2.25rem; }
.site-nav a { display: inline-flex; align-items: center; min-block-size: 2.75rem; font-size: var(--fs-small); color: var(--text-2); text-decoration: none; transition: color 0.2s; }
.site-nav a:hover { color: var(--text-1); }
@media (min-width: 56rem) { .site-nav { display: block; } }

.site-header__actions { display: flex; align-items: center; gap: 0.75rem; }
.pill {
  display: inline-flex; align-items: center; min-block-size: 2.75rem; padding-inline: 1.25rem;
  border: 1px solid rgb(255 255 255 / 0.5); border-radius: 999px;
  font-size: var(--fs-small); font-weight: 500; text-decoration: none; white-space: nowrap;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}
.pill:hover { background: var(--text-1); color: #000; border-color: var(--text-1); }
.menu-btn {
  inline-size: 2.75rem; block-size: 2.75rem; border-radius: 50%;
  border: 1px solid rgb(255 255 255 / 0.5); background: transparent; cursor: pointer;
  display: grid; place-items: center; transition: background-color 0.2s, border-color 0.2s;
}
.menu-btn:hover { background: rgb(255 255 255 / 0.1); border-color: var(--text-1); }
.menu-btn__lines, .menu-btn__lines::before { display: block; inline-size: 1rem; block-size: 1px; background: currentColor; }
.menu-btn__lines { position: relative; transform: translateY(-3px); }
.menu-btn__lines::before { content: ""; position: absolute; inset-block-start: 6px; inline-size: 0.625rem; }

@media (max-width: 23.5rem) {
  .brand__product { display: none; }
  .pill { padding-inline: 1rem; }
}

/* ---------- Chapter index dialog ---------- */
.index {
  inline-size: 100%; max-inline-size: none; block-size: 100%; max-block-size: none; margin: 0;
  padding: 0; border: 0; background: rgb(0 0 0 / 0.94); color: var(--text-1);
}
.index::backdrop { background: rgb(0 0 0 / 0.6); }
.index__inner { inline-size: min(100% - 2 * var(--gutter), 64rem); margin-inline: auto; padding-block: calc(env(safe-area-inset-top) + 1.25rem) 3rem; }
.index__head { display: flex; align-items: center; justify-content: space-between; margin-block-end: 1.5rem; }
.index__head .eyebrow { margin: 0; }
.index__close {
  inline-size: 2.75rem; block-size: 2.75rem; border-radius: 50%; border: 1px solid rgb(255 255 255 / 0.5);
  background: transparent; cursor: pointer; font-size: 1.5rem; line-height: 1; display: grid; place-items: center;
}
.index__close:hover { background: rgb(255 255 255 / 0.1); }
.index__list a {
  display: grid; grid-template-columns: 2.5rem 1fr; column-gap: 1rem; align-items: baseline;
  padding-block: 1rem; border-block-end: 1px solid var(--line-strong); text-decoration: none;
}
.index__num { font-size: var(--fs-eyebrow); color: var(--accent-text); letter-spacing: 0.1em; }
.index__name { font-size: var(--fs-h3); line-height: 1.15; transition: transform 0.3s var(--ease); }
.index__hint { grid-column: 2; font-size: var(--fs-small); color: var(--text-3); }
.index__list a:hover .index__name { transform: translateX(0.5rem); }
@media (min-width: 48rem) {
  .index__list a { grid-template-columns: 3rem 1fr auto; }
  .index__hint { grid-column: 3; }
}
@media (prefers-reduced-motion: no-preference) {
  .index[open] { animation: index-in 0.35s var(--ease); }
  @keyframes index-in { from { opacity: 0; } }
}

/* ---------- Buttons ---------- */
.explore {
  --c: var(--accent);
  position: relative; display: inline-flex; align-items: center; justify-content: center;
  min-block-size: 3.25rem; padding-inline: 2rem;
  border: 1px solid rgb(255 255 255 / 0.28);
  background:
    linear-gradient(var(--c), var(--c)) top left / 6px 6px no-repeat,
    linear-gradient(var(--c), var(--c)) top right / 6px 6px no-repeat,
    linear-gradient(var(--c), var(--c)) bottom left / 6px 6px no-repeat,
    linear-gradient(var(--c), var(--c)) bottom right / 6px 6px no-repeat,
    rgb(0 0 0 / 0.2);
  font-size: var(--fs-eyebrow); font-weight: 500; letter-spacing: 0.2em; text-transform: uppercase; text-decoration: none;
  overflow: hidden; isolation: isolate;
  transition: border-color 0.3s, color 0.3s;
}
.explore__corners { position: absolute; inset: 0; z-index: -1; background: var(--text-1); transform: scaleY(0); transform-origin: bottom; transition: transform 0.45s var(--ease); }
.explore:hover { color: #000; border-color: var(--text-1); }
.explore:hover .explore__corners { transform: scaleY(1); }
.explore--solid { background-color: var(--accent); border-color: var(--accent); --c: var(--text-1); }
.explore--solid:hover { border-color: var(--text-1); }

.text-link {
  display: inline-flex; align-items: center; min-block-size: 2.75rem;
  font-size: var(--fs-small); font-weight: 500; color: var(--text-1);
  text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 0.35em;
  transition: text-decoration-color 0.2s;
}
.text-link:hover { text-decoration-color: var(--text-1); }

/* ---------- Scroll sequences ---------- */
.seq { position: relative; z-index: 1; }
.anchor-top { position: absolute; inset-block-start: 0; }
.seq__stage { position: sticky; inset-block-start: 0; block-size: 100svh; overflow: hidden; background: #000; }
.seq__poster, .seq__canvas { position: absolute; inset: 0; inline-size: 100%; block-size: 100%; }
.seq__poster { object-fit: cover; }
.seq__canvas { opacity: 0; transition: opacity 0.4s; }
.seq.is-live .seq__canvas { opacity: 1; }
.seq.is-live .seq__poster { visibility: hidden; }
/* Navy-tinted renders fade into the black page instead of ending in a hard edge. */
.seq--full .seq__canvas, .seq--full .seq__poster {
  -webkit-mask-image: radial-gradient(130% 120% at 50% 45%, #000 55%, transparent 100%);
  mask-image: radial-gradient(130% 120% at 50% 45%, #000 55%, transparent 100%);
}

.seq__scrim {
  position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(to bottom, rgb(0 0 0 / 0.55), transparent 22%),
    linear-gradient(to right, rgb(0 0 0 / 0.78) 0%, rgb(0 0 0 / 0.42) 34%, transparent 60%),
    linear-gradient(to top, rgb(0 0 0 / 0.6), transparent 26%);
}

.seq__chapters { position: relative; z-index: 3; margin-block-start: -100svh; }
.chapter { position: relative; block-size: calc(var(--len, 160) * 1svh); pointer-events: none; }
.chapter__pin {
  will-change: opacity;
  position: sticky; inset-block-start: 0; block-size: 100svh;
  display: grid; grid-template-columns: minmax(0, 34rem) 1fr; grid-template-rows: 1fr auto;
  column-gap: 2rem;
  padding: calc(var(--header-h) + 12svh) var(--gutter) 6.5rem;
}
.chapter__pin > * { pointer-events: auto; }
.chapter__copy { grid-column: 1; grid-row: 1; align-self: start; }
.chapter__copy .h2, .chapter__copy .h3, .chapter__copy .display { margin-block-end: 1.25rem; }
.chapter__copy .lede { margin-block-end: 2.25rem; }
.chapter--hero .chapter__copy { max-inline-size: 36rem; }

/* Glass readout */
.readout, .glass-card {
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  backdrop-filter: blur(16px) saturate(1.2);
}
.readout {
  grid-column: 2; grid-row: 2; justify-self: end; align-self: end;
  display: flex; gap: 0; padding: 0.25rem;
}
.readout > div { padding: 1rem 1.25rem; min-inline-size: 8.5rem; }
.readout > div + div { border-inline-start: 1px solid var(--line-strong); }
.readout dt { font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-3); margin-block-end: 0.375rem; }
.readout dd { font-size: 1.5rem; line-height: 1.15; font-weight: 400; letter-spacing: -0.01em; white-space: nowrap; }

.glass-card {
  grid-column: 2; grid-row: 2; justify-self: end; align-self: end;
  display: grid; grid-template-columns: auto 1fr; column-gap: 1rem; row-gap: 0.25rem;
  inline-size: min(100%, 22rem); padding: 1rem; text-decoration: none;
  transition: border-color 0.25s, background-color 0.25s;
}
.glass-card:hover { border-color: rgb(255 255 255 / 0.4); background: rgb(30 30 30 / 0.8); }
.glass-card__icon { grid-row: span 2; inline-size: 3rem; block-size: 3rem; border-radius: 0.5rem; background: var(--accent); display: grid; place-items: center; }
.glass-card__title { font-size: 1rem; font-weight: 500; line-height: 1.3; }
.glass-card__body { font-size: var(--fs-small); color: var(--text-2); line-height: 1.45; }

.hero-tag {
  grid-column: 1; grid-row: 2; align-self: end;
  display: inline-flex; align-items: center; gap: 0.625rem;
  font-size: var(--fs-small); color: var(--text-2);
}

/* Chapter rail */
.rail {
  position: absolute; z-index: 4; inset-block-end: 1.75rem; inset-inline-start: 50%; transform: translateX(-50%);
  inline-size: min(100% - 2 * var(--gutter), 40rem);
}
.rail ol { display: grid; grid-template-columns: repeat(5, 1fr); }
.rail a {
  display: flex; align-items: baseline; gap: 0.5rem; min-block-size: 2.75rem; padding-block-start: 0.875rem;
  font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-3); text-decoration: none;
  transition: color 0.3s;
}
.rail a:hover, .rail a[aria-current="step"] { color: var(--text-1); }
.rail__num { color: inherit; opacity: 0.7; }
.rail__track { position: absolute; inset-block-start: 0; inset-inline: 0; block-size: 1px; background: var(--line-strong); }
.rail__fill { display: block; block-size: 100%; background: var(--accent-text); transform-origin: left; transform: scaleX(var(--rail, 0)); }

/* Split variant: camera viewfinder */
.seq--split .seq__stage { display: grid; }
.viewfinder {
  position: absolute; overflow: hidden;
  inset-block-start: 50%; inset-inline-end: var(--gutter);
  inline-size: min(56vw, 60rem); aspect-ratio: 2 / 1; transform: translateY(-46%);
  background: #000; border: 1px solid var(--line-strong);
}
.viewfinder .seq__poster { object-fit: cover; }
.viewfinder__corner { position: absolute; inline-size: 0.5rem; block-size: 0.5rem; background: var(--accent); }
.viewfinder__corner--tl { inset-block-start: -1px; inset-inline-start: -1px; }
.viewfinder__corner--tr { inset-block-start: -1px; inset-inline-end: -1px; }
.viewfinder__corner--bl { inset-block-end: -1px; inset-inline-start: -1px; }
.viewfinder__corner--br { inset-block-end: -1px; inset-inline-end: -1px; }
.viewfinder__hud { position: absolute; padding: 0.125rem 0.375rem; background: rgb(0 0 0 / 0.62); font-size: 0.75rem; letter-spacing: 0.14em; color: var(--text-1); font-variant-numeric: tabular-nums; }
.viewfinder__hud--tl { inset-block-start: 0.875rem; inset-inline-start: 1rem; }
.viewfinder__hud--tr { inset-block-start: 0.875rem; inset-inline-end: 1rem; }
.viewfinder__hud--bl { inset-block-end: 0.875rem; inset-inline-start: 1rem; }
.viewfinder__hud--br { inset-block-end: 0.875rem; inset-inline-end: 1rem; }
.seq--split .chapter__pin { grid-template-columns: minmax(0, min(30rem, 34vw)) 1fr; }

.spec-list { margin-block-start: 2rem; border-block-start: 1px solid var(--line-strong); max-inline-size: 30rem; }
.spec-list > div { display: grid; grid-template-columns: 6.5rem 1fr; gap: 1rem; padding-block: 0.75rem; border-block-end: 1px solid var(--line); }
.spec-list dt { font-size: var(--fs-small); color: var(--text-3); }
.spec-list dd { font-size: var(--fs-small); color: var(--text-1); }

/* ---------- Mobile + portrait sequence layout ---------- */
@media (max-width: 47.99rem), (orientation: portrait) and (max-width: 63.99rem) {
  .seq__scrim {
    background:
      linear-gradient(to bottom, rgb(0 0 0 / 0.6), transparent 16%),
      linear-gradient(to top, rgb(0 0 0 / 0.96) 0%, rgb(0 0 0 / 0.88) 38%, rgb(0 0 0 / 0.5) 54%, transparent 68%);
  }
  .chapter__copy { text-shadow: 0 1px 14px rgb(0 0 0 / 0.7); }
  .chapter__pin {
    display: flex; flex-direction: column; justify-content: flex-end; gap: 1rem;
    padding: var(--header-h) var(--gutter) calc(1.5rem + env(safe-area-inset-bottom));
  }
  .chapter__copy .lede { margin-block-end: 1.5rem; }
  .chapter__copy .h2, .chapter__copy .h3, .chapter__copy .display { margin-block-end: 0.875rem; }
  .eyebrow { margin-block-end: 0.875rem; }
  .glass-card, .hero-tag, .rail { display: none; }
  .readout { align-self: stretch; }
  .readout > div { flex: 1; min-inline-size: 0; padding: 0.75rem 1rem; }
  .readout dd { font-size: 1.125rem; white-space: normal; }
  .readout dt { font-size: 0.75rem; letter-spacing: 0.08em; }

  .viewfinder {
    inset-block-start: calc(var(--header-h) + 1rem); inset-inline: var(--gutter); inline-size: auto; transform: none;
    aspect-ratio: 16 / 10;
  }
  .spec-list { margin-block-start: 1rem; }
  .spec-list > div { grid-template-columns: 5.5rem 1fr; padding-block: 0.5rem; gap: 0.75rem; }
}

/* Short landscape screens (phones on their side) */
@media (max-height: 35rem) and (orientation: landscape) {
  .chapter__pin { padding-block: calc(var(--header-h) + 0.5rem) 1.25rem; }
  .glass-card, .readout, .rail, .hero-tag, .chapter__copy .lede, .spec-list { display: none; }
  .chapter__copy .body { font-size: var(--fs-small); }
  .chapter__copy .display { font-size: clamp(2rem, 1.2rem + 3vw, 2.75rem); }
  .chapter__copy .h2 { font-size: clamp(1.75rem, 1rem + 2.6vw, 2.5rem); }
  .chapter__copy .h3 { font-size: clamp(1.5rem, 1rem + 2vw, 2rem); }
}

/* ---------- Sections ---------- */
.section-head { margin-block-end: clamp(2.5rem, 1.5rem + 3vw, 4.5rem); max-inline-size: 48rem; }
.section-head--split { max-inline-size: none; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 1.5rem 3rem; }
.section-head--split .body { max-inline-size: 24rem; }

/* At a glance */
.glance { position: relative; z-index: 3; padding-block: var(--section-pad); background: var(--bg); }
.glance__grid {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  border-block-start: 1px solid var(--line-strong);
}
.stat { padding: 1.5rem 1rem 1.75rem 0; border-block-end: 1px solid var(--line-strong); }
.stat:nth-child(odd) { padding-inline-end: 1rem; }
.stat:nth-child(even) { padding-inline-start: 1rem; border-inline-start: 1px solid var(--line-strong); }
.stat:last-child { grid-column: 1 / -1; }
.stat dt { font-size: var(--fs-eyebrow); letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-3); margin-block-end: 1rem; }
.stat dd { display: flex; align-items: baseline; gap: 0.25rem; white-space: nowrap; }
.stat__num { font-size: var(--fs-big); line-height: 1; font-weight: 400; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.stat__unit { font-size: var(--fs-lede); color: var(--text-2); }
@media (min-width: 64rem) {
  .glance__grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .stat, .stat:nth-child(odd), .stat:nth-child(even) { padding: 2rem 1.5rem 2.25rem; border-inline-start: 1px solid var(--line-strong); }
  .stat:first-child { border-inline-start: 0; padding-inline-start: 0; }
  .stat:last-child { grid-column: auto; }
}

/* Easy ACRO */
.acro { position: relative; z-index: 3; padding-block: var(--section-pad); background: var(--bg); }
.acro__head { max-inline-size: 52rem; margin-block-end: clamp(3rem, 2rem + 4vw, 6rem); }
.acro__head .display { margin-block-end: 1.75rem; }
.moves { display: grid; grid-template-columns: 1fr; border-block-start: 1px solid var(--line-strong); }
.move { padding-block: 2rem 2.5rem; border-block-end: 1px solid var(--line-strong); }
.move__path { inline-size: 100%; max-inline-size: 22rem; aspect-ratio: 240 / 150; block-size: auto; margin-block-end: 1.5rem; overflow: visible; }
.move__guide { fill: none; stroke: var(--line-strong); stroke-width: 1; stroke-dasharray: 3 5; }
.move__line { fill: none; stroke: var(--accent-text); stroke-width: 1.5; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; }
.move__dot { fill: var(--text-1); }
.move.is-in .move__line { stroke-dashoffset: 0; transition: stroke-dashoffset 1.6s var(--ease); }
.move:nth-child(2).is-in .move__line { transition-delay: 0.15s; }
.move:nth-child(3).is-in .move__line { transition-delay: 0.3s; }
.move__name { font-size: var(--fs-h3); font-weight: 400; line-height: 1.1; display: flex; align-items: baseline; gap: 0.75rem; margin-block-end: 0.5rem; }
.move__num { font-size: var(--fs-eyebrow); letter-spacing: 0.12em; color: var(--accent-text); }
.move__body { color: var(--text-2); }
@media (min-width: 48rem) {
  .moves { grid-template-columns: repeat(3, minmax(0, 1fr)); border-block-end: 1px solid var(--line-strong); }
  .move { padding: 2.5rem 2rem 3rem; border-block-end: 0; border-inline-start: 1px solid var(--line-strong); }
  .move:first-child { border-inline-start: 0; padding-inline-start: 0; }
}

/* O4 */
.o4 { position: relative; z-index: 3; padding-block: var(--section-pad); background: var(--bg); overflow: hidden; }
.o4::before {
  content: ""; position: absolute; inset: auto 0 0; block-size: 70%; pointer-events: none;
  background: radial-gradient(60% 80% at 80% 100%, rgb(0 112 213 / 0.18), transparent 70%);
}
.o4__grid { position: relative; display: grid; gap: 3rem; grid-template-columns: 1fr; }
.o4__head .h2 { margin-block-end: 1.5rem; max-inline-size: 44rem; }
.o4__big { display: flex; align-items: baseline; gap: 0.5rem; line-height: 0.9; }
.o4__num { font-size: clamp(6rem, 3.5rem + 12vw, 14rem); font-weight: 300; letter-spacing: -0.05em; font-variant-numeric: tabular-nums; }
.o4__unit { font-size: var(--fs-h3); color: var(--text-2); }
.o4__caption { margin-block-start: 1rem; color: var(--text-2); max-inline-size: 22rem; }
.o4__facts { display: grid; grid-template-columns: 1fr; border-block-start: 1px solid var(--line-strong); }
.o4__facts > div { display: flex; justify-content: space-between; gap: 1rem; padding-block: 1rem; border-block-end: 1px solid var(--line-strong); }
.o4__facts dt { color: var(--text-3); font-size: var(--fs-small); }
.o4__facts dd { font-size: 1.125rem; text-align: end; }

.range { grid-column: 1 / -1; padding-block-start: 1rem; }
.range__caption { font-size: var(--fs-eyebrow); letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-3); margin-block-end: 3.25rem; }
.range__ruler { position: relative; block-size: 2px; background: var(--line-strong); margin-block-end: 3rem; }
.range__signal { position: absolute; inset: 0; background: linear-gradient(to right, var(--accent), var(--accent-text)); transform-origin: left; transform: scaleX(1); }
.js .range__signal { transform: scaleX(0); }
.js .range.is-in .range__signal { transform: scaleX(1); transition: transform 1.8s var(--ease); }
.range__mark { position: absolute; inset-block-start: 50%; inset-inline-start: var(--at); inline-size: 1px; block-size: 1.25rem; background: var(--text-1); transform: translate(-50%, -50%); }
.range__mark span { position: absolute; white-space: nowrap; font-size: var(--fs-small); color: var(--text-1); }
.range__mark--ce span { inset-block-end: calc(100% + 0.5rem); transform: translateX(-50%); }
.range__mark--fcc span { inset-block-start: calc(100% + 0.5rem); inset-inline-end: 0; }
.range__scale { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--text-3); font-variant-numeric: tabular-nums; }
.range__scale span:nth-child(2) { margin-inline-start: 18%; }
.range__scale span:nth-child(3) { margin-inline-start: auto; margin-inline-end: 18%; }
@media (max-width: 47.99rem) { .range__scale { visibility: hidden; } }

@media (min-width: 64rem) {
  .o4__grid { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); column-gap: 4rem; row-gap: 4rem; }
  .o4__latency { align-self: end; justify-self: end; }
  .o4__facts { grid-column: 1; grid-template-columns: repeat(3, 1fr); border-block-end: 1px solid var(--line-strong); }
  .o4__facts > div { flex-direction: column; justify-content: flex-start; border-block-end: 0; padding: 1.25rem 1.25rem 1.25rem 0; }
  .o4__facts > div + div { border-inline-start: 1px solid var(--line-strong); padding-inline-start: 1.25rem; }
  .o4__facts dd { text-align: start; }
}

/* Specs */
.specs { position: relative; z-index: 3; padding-block: var(--section-pad); background: var(--bg); }
.tabs__list {
  display: flex; gap: 0.25rem; overflow-x: auto; scrollbar-width: none;
  border-block-end: 1px solid var(--line-strong); margin-block-end: 0.5rem;
}
.tabs__list::-webkit-scrollbar { display: none; }
.tabs__tab {
  position: relative; flex: none; min-block-size: 3rem; padding-inline: 1rem;
  border: 0; background: transparent; cursor: pointer;
  font-size: var(--fs-small); font-weight: 500; letter-spacing: 0.06em; color: var(--text-3);
  transition: color 0.2s;
}
.tabs__tab:first-child { padding-inline-start: 0; }
.tabs__tab::after { content: ""; position: absolute; inset-inline: 1rem; inset-block-end: -1px; block-size: 2px; background: var(--accent-text); transform: scaleX(0); transition: transform 0.3s var(--ease); }
.tabs__tab:first-child::after { inset-inline-start: 0; }
.tabs__tab:hover { color: var(--text-1); }
.tabs__tab[aria-selected="true"] { color: var(--text-1); }
.tabs__tab[aria-selected="true"]::after { transform: scaleX(1); }
.tabs__tab:focus-visible { outline-offset: -4px; }
.tabs__panel:focus-visible { outline-offset: 6px; }
.spec-table > div { display: grid; grid-template-columns: 1fr; gap: 0.25rem; padding-block: 1.125rem; border-block-end: 1px solid var(--line); }
.spec-table dt { font-size: var(--fs-small); color: var(--text-3); }
.spec-table dd { font-size: 1.0625rem; color: var(--text-1); }
@media (min-width: 48rem) {
  .spec-table > div { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 2rem; }
}

/* Order */
.order { position: relative; z-index: 3; min-block-size: 100svh; display: grid; place-items: center; overflow: hidden; background: #000; isolation: isolate; }
.order__img { position: absolute; inset: 0; inline-size: 100%; block-size: 100%; object-fit: cover; z-index: -2; opacity: 0.65; }
.order::before { content: ""; position: absolute; inset: 0; z-index: -1; background: radial-gradient(70% 60% at 50% 50%, rgb(0 0 0 / 0.55), rgb(0 0 0 / 0.85) 70%, #000 100%); }
.order__inner { inline-size: min(100% - 2 * var(--gutter), 46rem); text-align: center; padding-block: var(--section-pad); }
.order__inner .display { margin-block-end: 1.5rem; }
.order__inner .lede { margin-inline: auto; margin-block-end: 2.5rem; }
.order__actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 1rem 2rem; }
@media (max-width: 47.99rem) { .order__img { object-position: 50% 40%; } }

/* Footer */
.site-footer { position: relative; z-index: 3; background: var(--bg); border-block-start: 1px solid var(--line-strong); padding-block: 3.5rem calc(2.5rem + env(safe-area-inset-bottom)); }
.site-footer__top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 1.5rem; margin-block-end: 2.5rem; }
.site-footer__links { display: flex; flex-wrap: wrap; gap: 0.25rem 1.75rem; }
.site-footer__links a { display: inline-flex; align-items: center; min-block-size: 2.75rem; font-size: var(--fs-small); color: var(--text-2); text-decoration: none; }
.site-footer__links a:hover { color: var(--text-1); }
.footnotes { list-style: decimal; padding-inline-start: 1.25rem; display: grid; gap: 0.5rem; max-inline-size: 56rem; margin-block-end: 2rem; }
.footnotes li { font-size: 0.8125rem; color: var(--text-3); line-height: 1.5; }
.footnotes li:target { color: var(--text-1); }
.site-footer__legal { font-size: 0.8125rem; color: var(--text-3); }

/* ---------- Reveal ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js .reveal { opacity: 0; transform: translateY(1.5rem); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
  .js .reveal.is-in { opacity: 1; transform: none; }
}

/* ---------- Preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
  .move__line { stroke-dashoffset: 0; }
  .js .range__signal { transform: scaleX(1); }
}
@media (prefers-reduced-transparency: reduce) {
  .readout, .glass-card { background: #111; -webkit-backdrop-filter: none; backdrop-filter: none; }
  .index { background: #000; }
}
@media (forced-colors: active) {
  .readout, .glass-card, .explore, .pill, .menu-btn, .viewfinder { border: 1px solid CanvasText; }
  .sq, .viewfinder__corner { forced-color-adjust: none; background: Highlight; }
  .seq__scrim, .hairlines { display: none; }
  .rail__fill, .range__signal { background: Highlight; }
}

/* Anchor jumps land a little inside a chapter, so its own frame and copy are already active. */
.chapter { scroll-margin-block-start: calc(-1 * var(--header-h) - 12svh); }