/* ───────────────────────────────────────────────────────────────
   Ceiran — site.css
   One stylesheet, no framework. Dark by default; a warm "paper" ground for the money sections.
   Magenta (#fe16cf) is the only accent and stays rare: it marks the live thing on the page.
   ─────────────────────────────────────────────────────────────── */

@font-face {
  font-family: "Space Grotesk";
  src: url("/fonts/space-grotesk.woff2?v=8559d5f914") format("woff2");
  font-weight: 300 700;
  font-style: normal;
  font-display: swap;
}
/* metric-matched fallback → no layout shift when the real font swaps in */
@font-face {
  font-family: "Space Grotesk Fallback";
  src: local("Arial"), local("Helvetica Neue"), local("Helvetica");
  size-adjust: 112%;
  ascent-override: 88%;
  descent-override: 26%;
  line-gap-override: 0%;
}

@layer reset, tokens, base, layout, components, sections, utilities;

/* ───────── reset ───────── */
@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  * { margin: 0; }
  html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
  img, svg, canvas, video { display: block; max-width: 100%; }
  img { height: auto; }
  button, input, select, textarea { font: inherit; color: inherit; }
  button { background: none; border: 0; padding: 0; cursor: pointer; }
  a { color: inherit; text-decoration: none; }
  ul, ol { padding: 0; list-style: none; }
  :target { scroll-margin-top: 5.5rem; }
  [hidden] { display: none !important; }
}

/* ───────── tokens ───────── */
@layer tokens {
  :root {
    color-scheme: dark;

    --font: "Space Grotesk", "Space Grotesk Fallback", system-ui, -apple-system, "Segoe UI", sans-serif;

    /* ink: neutrals tinted toward the brand hue so nothing is dead grey */
    --ink-950: oklch(0.105 0.012 335);
    --ink-900: oklch(0.125 0.013 335);
    --ink-850: oklch(0.15 0.014 335);
    --ink-800: oklch(0.185 0.016 335);
    --ink-700: oklch(0.235 0.018 335);
    --ink-600: oklch(0.31 0.02 335);
    --hair: oklch(0.3 0.02 335);
    --hair-soft: oklch(0.23 0.018 335);

    --fg: oklch(0.965 0.008 345);
    --fg-2: oklch(0.8 0.014 340);
    --fg-3: oklch(0.64 0.02 340);

    --pri: #fe16cf;                      /* brand magenta */
    --pri-hi: oklch(0.78 0.19 335);      /* readable magenta for small text on dark */
    --pri-ink: oklch(0.14 0.03 335);     /* text on magenta */
    --sec: #a855f7;                      /* brand purple — diagrams & LCD only */
    --ok: oklch(0.8 0.17 155);
    --warn: oklch(0.82 0.15 80);

    --paper: oklch(0.958 0.013 350);
    --paper-2: oklch(0.925 0.02 350);
    --paper-ink: oklch(0.2 0.035 335);
    --paper-ink-2: oklch(0.4 0.04 335);
    --paper-hair: oklch(0.8 0.025 345);
    --pri-paper: oklch(0.52 0.26 335);   /* magenta that holds contrast on paper */

    /* semantic (rebound inside .paper) */
    --bg: var(--ink-850);
    --surface: var(--ink-800);
    --line: var(--hair);
    --accent-text: var(--pri-hi);

    /* type */
    --t-0: 0.8125rem;
    --t-1: 0.9375rem;
    --t-2: 1.0625rem;
    --t-3: clamp(1.1875rem, 1.1rem + 0.45vw, 1.4375rem);
    --t-4: clamp(1.625rem, 1.25rem + 1.5vw, 2.5rem);
    --t-5: clamp(2.125rem, 1.3rem + 3.5vw, 4.5rem);
    --t-6: clamp(2.75rem, 1rem + 6.4vw, 7rem);

    /* space */
    --gutter: clamp(1.25rem, 0.5rem + 3.4vw, 3.5rem);
    --max: 82rem;
    --sec-y: clamp(5rem, 3rem + 8vw, 10.5rem);
    --header-h: 4.25rem;

    --r-s: 0.5rem;
    --r-m: 0.875rem;
    --r-l: 1.25rem;

    --ease: cubic-bezier(0.22, 1, 0.36, 1);        /* quint out */
    --ease-io: cubic-bezier(0.65, 0, 0.35, 1);
  }
}

/* ───────── base ───────── */
@layer base {
  body {
    font-family: var(--font);
    font-size: var(--t-2);
    line-height: 1.68;
    font-weight: 400;
    color: var(--fg);
    background: var(--bg);
    font-kerning: normal;
    font-feature-settings: "kern", "liga";
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: clip;
  }
  ::selection { background: var(--pri); color: var(--pri-ink); }
  :focus-visible { outline: 2px solid var(--pri-hi); outline-offset: 3px; border-radius: 4px; }
  h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.035em; line-height: 1.02; text-wrap: balance; }
  p { text-wrap: pretty; }
  strong { font-weight: 600; }
  .num { font-variant-numeric: tabular-nums; font-feature-settings: "tnum", "zero" 0; }

  .skip { position: fixed; left: 1rem; top: -4rem; z-index: 100; background: var(--pri); color: var(--pri-ink); padding: 0.7rem 1rem; border-radius: var(--r-s); font-weight: 600; transition: top 0.2s; }
  .skip:focus { top: 1rem; }
}

/* ───────── layout ───────── */
@layer layout {
  .container { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }
  .section { padding-block: var(--sec-y); position: relative; }
  .section--tight { padding-block: calc(var(--sec-y) * 0.6); }
  .section.defer { content-visibility: auto; contain-intrinsic-size: auto 52rem; }

  /* warm paper ground: rebinds the semantic colors, components adapt on their own */
  .paper {
    --bg: var(--paper); --surface: var(--paper-2); --line: var(--paper-hair); --accent-text: var(--pri-paper);
    --fg: var(--paper-ink); --fg-2: var(--paper-ink-2); --fg-3: oklch(0.52 0.04 335);
    --hair: var(--paper-hair);
    color-scheme: light;
    background: var(--paper); color: var(--paper-ink);
  }
  .raised { background: var(--ink-900); }

  .sec-head { display: grid; gap: 1.25rem; margin-bottom: clamp(2.5rem, 2rem + 3vw, 5rem); max-width: 56rem; }
  .sec-head h2 { font-size: var(--t-5); }
  .sec-head .lead { max-width: 40rem; }
  .sec-head--split { max-width: none; grid-template-columns: minmax(0, 1fr); }
  @media (min-width: 62rem) {
    .sec-head--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); align-items: end; column-gap: 4rem; }
    .sec-head--split .lead { justify-self: end; }
  }
}

/* ───────── components ───────── */
@layer components {
  /* pixel motif — the squares that break off the logo's swirl */
  .px { display: inline-flex; gap: 0.2em; align-items: center; vertical-align: middle; }
  .px i { display: block; width: 0.38em; height: 0.38em; background: var(--pri); }
  .px i:nth-child(2) { opacity: 0.62; }
  .px i:nth-child(3) { opacity: 0.34; }
  .px i:nth-child(4) { opacity: 0.16; }

  .eyebrow { display: flex; align-items: center; gap: 0.8em; font-size: var(--t-0); font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-2); line-height: 1.3; }
  .lead { font-size: var(--t-3); line-height: 1.55; color: var(--fg-2); max-width: 36rem; }
  .muted { color: var(--fg-2); }

  /* buttons */
  .btn {
    --b-bg: transparent; --b-fg: var(--fg); --b-bd: var(--line);
    display: inline-flex; align-items: center; justify-content: center; gap: 0.7em;
    min-height: 3.1rem; padding: 0.8em 1.45em; border-radius: var(--r-m);
    font-size: var(--t-1); font-weight: 600; letter-spacing: -0.01em; line-height: 1; white-space: nowrap;
    background: var(--b-bg); color: var(--b-fg); border: 1px solid var(--b-bd);
    transition: transform 0.35s var(--ease), background-color 0.25s, border-color 0.25s, color 0.25s;
  }
  .btn svg { width: 1.1em; height: 1.1em; flex: none; transition: transform 0.35s var(--ease); }
  .btn:hover svg { transform: translateX(0.22em); }
  .btn:active { transform: translateY(1px) scale(0.99); }
  .btn--pri { --b-bg: var(--pri); --b-fg: var(--pri-ink); --b-bd: var(--pri); }
  .btn--pri:hover { --b-bg: oklch(0.74 0.27 335); --b-bd: oklch(0.74 0.27 335); }
  .btn--ghost:hover { --b-bd: var(--fg-3); }
  .btn--ink { --b-bg: var(--paper-ink); --b-fg: var(--paper); --b-bd: var(--paper-ink); }
  .btn--ink:hover { --b-bg: var(--pri-paper); --b-bd: var(--pri-paper); }
  .btn--lg { min-height: 3.5rem; padding-inline: 1.75em; font-size: var(--t-2); }
  .btn--sm { min-height: 2.5rem; padding: 0.6em 1.05em; border-radius: var(--r-s); font-size: var(--t-0); }

  .link { display: inline-flex; align-items: center; gap: 0.55em; font-weight: 500; font-size: var(--t-1); color: var(--fg); padding-block: 0.4em; background: linear-gradient(currentColor, currentColor) 0 100% / 100% 1px no-repeat; transition: background-size 0.4s var(--ease), color 0.2s; }
  .link:hover { background-size: 0 1px; background-position: 100% 100%; color: var(--accent-text); }
  .link svg { width: 1em; height: 1em; }

  /* ── header ── */
  .site-header { position: fixed; inset: 0 0 auto 0; z-index: 50; height: var(--header-h); transition: transform 0.45s var(--ease), background-color 0.3s, border-color 0.3s; border-bottom: 1px solid transparent; }
  .site-header.is-stuck { background: color-mix(in oklch, var(--ink-900) 86%, transparent); backdrop-filter: blur(14px) saturate(140%); -webkit-backdrop-filter: blur(14px) saturate(140%); border-bottom-color: var(--hair-soft); }
  .site-header.is-hidden { transform: translateY(-101%); }
  .site-header__bar { height: 100%; display: flex; align-items: center; gap: 2rem; }
  .brand { display: block; line-height: 0; flex: none; }
  .brand img { height: 2.6rem; width: auto; }
  .nav { display: none; margin-left: auto; gap: clamp(1.25rem, 2.4vw, 2.5rem); }
  .nav a { position: relative; font-size: var(--t-1); font-weight: 500; color: var(--fg-2); padding-block: 0.5rem; transition: color 0.2s; }
  .nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0.1rem; height: 2px; background: var(--pri); transform: scaleX(0); transform-origin: left; transition: transform 0.4s var(--ease); }
  .nav a:hover, .nav a[aria-current="page"] { color: var(--fg); }
  .nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
  .site-header .btn { display: none; }
  .menu-btn { margin-left: auto; width: 2.75rem; height: 2.75rem; display: grid; place-content: center; gap: 0.38rem; border-radius: var(--r-s); }
  .menu-btn span { display: block; width: 1.5rem; height: 2px; background: var(--fg); transition: transform 0.4s var(--ease), opacity 0.2s; }
  .menu-btn[aria-expanded="true"] span:first-child { transform: translateY(0.22rem) rotate(45deg); }
  .menu-btn[aria-expanded="true"] span:last-child { transform: translateY(-0.22rem) rotate(-45deg); }
  @media (min-width: 62rem) {
    .nav { display: flex; }
    .site-header .btn { display: inline-flex; }
    .menu-btn { display: none; }
  }
  .menu { position: fixed; inset: 0; z-index: 45; background: var(--ink-950); padding: calc(var(--header-h) + 2rem) var(--gutter) 2rem; display: flex; flex-direction: column; justify-content: space-between; opacity: 0; visibility: hidden; transition: opacity 0.35s, visibility 0.35s; }
  .menu.is-open { opacity: 1; visibility: visible; }
  .menu nav { display: grid; gap: 0.25rem; }
  .menu nav a { font-size: clamp(2rem, 9vw, 3.25rem); font-weight: 600; letter-spacing: -0.04em; padding-block: 0.25em; border-bottom: 1px solid var(--hair-soft); transform: translateY(14px); opacity: 0; transition: transform 0.6s var(--ease), opacity 0.4s, color 0.2s; transition-delay: calc(var(--i, 0) * 45ms); }
  .menu.is-open nav a { transform: none; opacity: 1; }
  .menu nav a:hover { color: var(--pri-hi); }
  .menu .btn { width: 100%; }

  /* ── footer ── */
  .site-footer { background: var(--ink-950); border-top: 1px solid var(--hair-soft); padding-block: clamp(3.5rem, 2rem + 5vw, 6rem) 2rem; font-size: var(--t-1); }
  .footer__grid { display: grid; gap: 3rem; grid-template-columns: 1fr; }
  .footer__brand img { height: 2.6rem; width: auto; margin-bottom: 1.25rem; }
  .footer__brand p { color: var(--fg-2); max-width: 24rem; }
  .footer__cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
  .footer__cols h2 { font-size: var(--t-0); letter-spacing: 0.14em; text-transform: uppercase; font-weight: 500; color: var(--fg-3); margin-bottom: 1rem; }
  .footer__cols a { display: block; padding-block: 0.35rem; color: var(--fg-2); transition: color 0.2s; }
  .footer__cols a:hover { color: var(--fg); }
  .footer__base { margin-top: clamp(3rem, 6vw, 5rem); padding-top: 1.5rem; border-top: 1px solid var(--hair-soft); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.75rem 2rem; color: var(--fg-3); font-size: var(--t-0); letter-spacing: 0.04em; }
  @media (min-width: 52rem) { .footer__grid { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); } .footer__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
}

/* ───────── sections ───────── */
@layer sections {
  /* ── hero ── */
  .hero { position: relative; isolation: isolate; min-height: min(100svh, 62rem); padding-top: calc(var(--header-h) + clamp(1.5rem, 4vw, 3.5rem)); padding-bottom: clamp(2rem, 4vw, 3.5rem); display: grid; align-items: center; overflow: clip; background: var(--ink-900); }
  .hero__bg { position: absolute; inset: 0; z-index: -1; pointer-events: none;
    background:
      radial-gradient(52% 62% at 74% 56%, oklch(0.235 0.045 335) 0%, transparent 72%),
      radial-gradient(circle at center, oklch(0.4 0.03 335) 0.9px, transparent 1.6px) 0 0 / 24px 24px;
    -webkit-mask-image: radial-gradient(85% 95% at 70% 52%, #000 22%, transparent 78%);
    mask-image: radial-gradient(85% 95% at 70% 52%, #000 22%, transparent 78%);
    opacity: 0.9; }
  .hero__grid { display: grid; gap: clamp(1.5rem, 4vw, 3rem); align-items: center; }
  .hero__copy { position: relative; z-index: 2; display: grid; gap: clamp(1.25rem, 2.4vw, 1.9rem); justify-items: start; }
  .hero h1 { font-size: clamp(2.7rem, 0.9rem + 4.6vw, 5.6rem); line-height: 0.94; letter-spacing: -0.05em; font-weight: 600; }
  .hero h1 .line { display: block; overflow: hidden; padding: 0.1em 0 0.15em; margin: -0.1em 0 -0.15em; }
  .hero h1 .line > span { display: inline-block; }
  .hero__cta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem 1.75rem; margin-top: 0.4rem; }
  .hero__note { font-size: var(--t-0); color: var(--fg-3); letter-spacing: 0.02em; display: flex; align-items: center; gap: 0.7em; }
  .hero__stage { position: relative; z-index: 1; }

  /* device figure: poster paints first, the WebGL canvas takes over seamlessly */
  .device { position: relative; aspect-ratio: 14 / 11; width: 100%; margin: 0; user-select: none; -webkit-user-select: none; }
  .device img, .device canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
  .device canvas { opacity: 0; transition: opacity 0.7s var(--ease) 0.05s; cursor: grab; touch-action: pan-y; outline-offset: -6px; }
  .device canvas.is-dragging { cursor: grabbing; }
  .device.is-live canvas { opacity: 1; }
  .device.is-live img { opacity: 0; transition: opacity 0.5s 0.45s; }
  .device__hint { position: absolute; left: 50%; bottom: 3%; translate: -50% 0; font-size: var(--t-0); letter-spacing: 0.12em; text-transform: uppercase; color: var(--fg-3); display: flex; align-items: center; gap: 0.7em; opacity: 0; transition: opacity 0.6s; pointer-events: none; white-space: nowrap; }
  .device.is-live .device__hint { opacity: 1; }
  .device.has-moved .device__hint { opacity: 0; }

  .rail { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.75rem; margin-top: clamp(0.5rem, 2vw, 1.25rem); position: relative; z-index: 2; }
  .rail li { position: relative; padding-top: 0.85rem; font-size: var(--t-0); line-height: 1.35; color: var(--fg-3); transition: color 0.3s; }
  .rail li::before, .rail li::after { content: ""; position: absolute; left: 0; top: 0; height: 2px; }
  .rail li::before { right: 0; background: var(--hair); }
  .rail li::after { width: 100%; background: var(--pri); transform: scaleX(0); transform-origin: left; }
  .rail li.is-done::after { transform: scaleX(1); }
  .rail li.is-on::after { animation: railfill var(--dur, 3s) linear forwards; }
  @keyframes railfill { to { transform: scaleX(1); } }
  .rail li b { display: block; font-weight: 500; color: var(--fg-3); letter-spacing: 0.1em; margin-bottom: 0.15rem; font-variant-numeric: tabular-nums; }
  .rail li.is-on { color: var(--fg); }
  .rail li.is-on b { color: var(--pri-hi); }

  @media (min-width: 62rem) {
    .hero__grid { grid-template-columns: minmax(0, 5.7fr) minmax(0, 6.3fr); }
    .hero__stage { margin-right: calc(var(--gutter) * -1.1); margin-left: -4%; }
  }
  @media (max-width: 61.99rem) {
    .hero h1 { font-size: clamp(2.7rem, 0.9rem + 8.2vw, 4.9rem); }
    .hero { min-height: 0; padding-bottom: 2.5rem; }
    .hero__stage { order: 2; margin-inline: calc(var(--gutter) * -0.6); }
    .rail li:nth-child(n+3) { display: none; }
    .rail { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  }

  /* hero entrance — plain CSS animation: starts at first paint, never waits on JS or fonts */
  .js .hero h1 .line > span { animation: line-up 1s var(--ease) both; animation-delay: calc(0.04s + var(--i, 0) * 0.07s); }
  .js .hero [data-in] { animation: rise 0.8s var(--ease) both; animation-delay: calc(0.1s + var(--i, 0) * 0.07s); }
  .js .hero__stage { animation: stage-in 1.2s var(--ease) 0.08s both; }
  @keyframes line-up { from { transform: translateY(112%); } }
  @keyframes rise { from { opacity: 0; transform: translateY(16px); } }
  @keyframes stage-in { from { opacity: 0; transform: scale(0.965); } }

  /* ── before / after ── */
  .ba { border-top: 1px solid var(--line); }
  .ba__row { display: grid; gap: 0.9rem 3rem; padding-block: clamp(1.5rem, 1rem + 2vw, 2.5rem); border-bottom: 1px solid var(--line); position: relative; }
  .ba__no { font-size: var(--t-0); letter-spacing: 0.12em; color: var(--fg-3); font-variant-numeric: tabular-nums; }
  .ba__before { color: var(--fg-3); font-size: var(--t-3); line-height: 1.45; max-width: 30rem; }
  .ba__after { font-size: var(--t-4); line-height: 1.12; letter-spacing: -0.03em; font-weight: 500; max-width: 34rem; }
  .ba__after em { font-style: normal; color: var(--accent-text); }
  .ba__arrow { display: none; width: 2.5rem; height: 1px; background: var(--fg-3); position: relative; margin-top: 0.9em; }
  .ba__arrow::after { content: ""; position: absolute; right: 0; top: -4px; width: 9px; height: 9px; border-top: 1px solid var(--fg-3); border-right: 1px solid var(--fg-3); transform: rotate(45deg); transform-origin: center; }
  @media (min-width: 62rem) {
    .ba__row { grid-template-columns: 3rem minmax(0, 5fr) 3rem minmax(0, 7fr); align-items: baseline; }
    .ba__arrow { display: block; align-self: start; margin-top: 0.8em; }
  }
}

/* ───────── utilities ───────── */
@layer utilities {
  .vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  [data-reveal] { transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); transition-delay: calc(var(--d, 0) * 80ms); }
  .reveal-all [data-reveal] { opacity: 1 !important; transform: none !important; }
  .js [data-reveal]:not(.is-in) { opacity: 0; transform: translateY(26px); }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; transition-delay: 0ms !important; }
    .js [data-reveal]:not(.is-in) { opacity: 1; transform: none; }
    .js .hero h1 .line > span, .js .hero [data-in], .js .hero__stage { animation: none; }
  }
}

/* ═════════ story (sticky stage) ═════════ */
@layer sections {
  .grid-gap { display: grid; gap: 1.25rem; }
  .story__layout { display: grid; gap: 1.5rem; }
  .story__steps { display: grid; align-content: start; }
  .step { padding-block: clamp(2.5rem, 16vh, 8rem); max-width: 30rem; }
  .step h3, .step p, .step__n { transition: color 0.6s var(--ease); }
  .step:not(.is-active) h3, .step:not(.is-active) p, .step:not(.is-active) strong, .step:not(.is-active) .step__n { color: var(--fg-3); }
  .step:first-child { padding-top: clamp(1rem, 6vh, 4rem); }
  .step:last-child { padding-bottom: clamp(3rem, 20vh, 10rem); }
  .step__n { display: block; margin-bottom: 1rem; font-size: var(--t-0); letter-spacing: 0.14em; color: var(--pri-hi); }
  .step h3 { font-size: var(--t-4); margin-bottom: 1.1rem; }
  .step p { color: var(--fg-2); }
  .step strong { color: var(--fg); }

  .story__stage {
    --stage-h: min(78vh, 46rem);
    position: sticky; top: calc(var(--header-h) + 1rem); height: var(--stage-h); container-type: inline-size;
    display: grid; grid-template-columns: minmax(0, 1.28fr) minmax(0, 1fr); align-items: center; gap: 0.5rem;
    border: 1px solid var(--hair-soft); border-radius: var(--r-l); padding: clamp(1rem, 3cqi, 2rem);
    background: radial-gradient(70% 70% at 30% 55%, oklch(0.2 0.03 335), var(--ink-900) 75%);
    transition: grid-template-columns 0.9s var(--ease);
    overflow: hidden;
  }
  .story__stage[data-step="4"], .story__stage[data-step="6"] { grid-template-columns: minmax(0, 0fr) minmax(0, 1fr); gap: 0; }
  .stage__count { position: absolute; top: 1.1rem; left: 1.4rem; z-index: 3; font-size: var(--t-0); letter-spacing: 0.12em; color: var(--fg-3); display: flex; gap: 0.5em; align-items: baseline; }
  .stage__count b { color: var(--fg); font-weight: 500; }

  .stage__device { min-width: 0; transition: opacity 0.6s var(--ease), transform 0.9s var(--ease); }
  .story__stage[data-step="4"] .stage__device, .story__stage[data-step="6"] .stage__device { opacity: 0; transform: translateX(-12%) scale(0.9); pointer-events: none; }
  .device--stage { aspect-ratio: 1 / 1.05; margin-left: -8%; width: 116%; }
  .device--stage canvas:not(.lcd-flat) { opacity: 1; }
  .device--stage .lcd-flat { display: none; }
  .device--stage.is-flat canvas:not(.lcd-flat) { display: none; }
  .device--stage.is-flat .lcd-flat { display: block; opacity: 1; position: static; width: 100%; height: auto; aspect-ratio: 4 / 3; border-radius: 0.9rem; border: 0.4rem solid oklch(0.08 0.01 335); box-shadow: 0 1.5rem 3rem -1rem rgb(0 0 0 / 0.8), 0 0 0 1px var(--hair); background: #0a0a0a; align-self: center; }
  .device--stage.is-flat { aspect-ratio: auto; margin: 0; width: 100%; display: grid; align-items: center; }

  .stage__surfaces { position: relative; display: grid; grid-template-columns: minmax(0, 1fr); place-items: center; height: 100%; min-width: 0; }
  .surface { grid-area: 1 / 1; width: 100%; min-width: 0; display: grid; place-items: center; opacity: 0; transform: translateY(18px) scale(0.975); transition: opacity 0.55s var(--ease), transform 0.8s var(--ease); pointer-events: none; }
  .surface--wide { align-self: center; }
  .story__stage[data-step="1"] .surface[data-for="1"],
  .story__stage[data-step="2"] .surface[data-for="2"],
  .story__stage[data-step="3"] .surface[data-for="3"],
  .story__stage[data-step="4"] .surface[data-for="4"],
  .story__stage[data-step="5"] .surface[data-for="5"],
  .story__stage[data-step="6"] .surface[data-for="6"] { opacity: 1; transform: none; transition-delay: 0.12s; }

  /* app frame for real screenshots */
  .frame { position: relative; margin: 0; border: 1px solid var(--hair); border-radius: var(--r-m); overflow: hidden; background: var(--ink-950); box-shadow: 0 2.2rem 4.5rem -1.5rem rgb(0 0 0 / 0.75), inset 0 0 0 1px rgb(255 255 255 / 0.025); }
  .frame img { width: 100%; height: auto; }
  .frame--fade::after { content: ""; position: absolute; inset: auto 0 0 0; height: 34%; background: linear-gradient(to bottom, transparent, var(--ink-950)); pointer-events: none; }

  /* phone mockups (decorative UI, built in CSS) */
  .phone { width: min(100%, 16.25rem); aspect-ratio: 9 / 18.2; padding: 0.5rem; border-radius: 2.4rem; background: oklch(0.09 0.01 335); border: 1px solid var(--ink-600); box-shadow: 0 2.4rem 4.5rem -1.2rem rgb(0 0 0 / 0.8), inset 0 0 0 1px rgb(255 255 255 / 0.03); rotate: 3deg; }
  .phone__screen { height: 100%; border-radius: 1.95rem; background: oklch(0.165 0.015 335); overflow: hidden; padding: 0.9rem 0.95rem 1rem; display: flex; flex-direction: column; gap: 0.75rem; font-size: 0.8125rem; line-height: 1.3; position: relative; }
  .phone__screen::before { content: ""; position: absolute; top: 0.5rem; left: 50%; translate: -50% 0; width: 4.2rem; height: 1.15rem; border-radius: 99px; background: oklch(0.07 0.01 335); }
  .phone__status { display: flex; justify-content: space-between; font-size: 0.6875rem; color: var(--fg-2); padding: 0.05rem 0.45rem 0; letter-spacing: 0.02em; }
  .phone__cap { text-align: center; color: var(--fg-3); font-size: 0.75rem; margin-top: auto; }

  .ring { --p: 34; position: relative; width: 82%; aspect-ratio: 1; margin: 1.1rem auto 0; display: grid; place-items: center; }
  .ring::before { content: ""; position: absolute; inset: 0; border-radius: 50%; background: conic-gradient(var(--pri) calc(var(--p) * 1%), oklch(0.26 0.03 335) 0); -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 0.65rem), #000 calc(100% - 0.6rem)); mask: radial-gradient(farthest-side, transparent calc(100% - 0.65rem), #000 calc(100% - 0.6rem)); }
  .ring__in { text-align: center; display: grid; gap: 0.1rem; }
  .ring__in b { font-size: 2.6rem; font-weight: 600; letter-spacing: -0.05em; line-height: 1; }
  .ring__in small { color: var(--pri-hi); font-size: 0.75rem; }

  .menu-head { display: flex; justify-content: space-between; align-items: center; margin-top: 0.9rem; }
  .menu-head b { font-size: 1.25rem; letter-spacing: -0.03em; }
  .chip { font-size: 0.6875rem; padding: 0.2rem 0.55rem; border-radius: 99px; border: 1px solid var(--hair); color: var(--fg-2); }
  .chips { display: flex; gap: 0.4rem; }
  .chips span { padding: 0.28rem 0.7rem; border-radius: 99px; background: oklch(0.22 0.02 335); color: var(--fg-2); font-size: 0.75rem; }
  .chips .is-on { background: var(--fg); color: var(--ink-900); }
  .menu-list { display: grid; }
  .menu-list li { display: grid; grid-template-columns: 1fr auto auto; gap: 0.6rem; align-items: center; padding: 0.7rem 0; border-bottom: 1px solid var(--hair-soft); }
  .menu-list b { font-weight: 500; color: var(--fg-2); }
  .qty { font-style: normal; min-width: 1.45rem; height: 1.45rem; line-height: 1.45rem; text-align: center; border-radius: 99px; background: var(--pri); color: var(--pri-ink); font-size: 0.75rem; font-weight: 600; }
  .order-bar { margin-top: auto; display: flex; justify-content: space-between; padding: 0.85rem 1rem; border-radius: 0.9rem; background: var(--pri); color: var(--pri-ink); font-weight: 600; }

  .wait { margin: auto 0; display: grid; gap: 0.7rem; text-align: center; justify-items: center; }
  .wait b { font-size: 1.25rem; letter-spacing: -0.03em; }
  .wait p { color: var(--fg-2); }
  .wait strong { color: var(--pri-hi); }
  .wait small { color: var(--fg-3); }
  .wait__dot { width: 0.9rem; height: 0.9rem; background: var(--pri); border-radius: 50%; box-shadow: 0 0 0 0 color-mix(in oklch, var(--pri) 60%, transparent); animation: pulse 1.8s var(--ease) infinite; }
  @keyframes pulse { 0% { box-shadow: 0 0 0 0 color-mix(in oklch, var(--pri) 55%, transparent); } 100% { box-shadow: 0 0 0 1.4rem transparent; } }
  .wait__bar { width: 80%; height: 3px; background: oklch(0.26 0.03 335); border-radius: 3px; overflow: hidden; }
  .wait__bar i { display: block; height: 100%; background: var(--pri); transform-origin: left; animation: drain 30s linear infinite; }
  @keyframes drain { from { transform: scaleX(1); } to { transform: scaleX(0); } }

  .staff-title { font-size: 1.25rem; letter-spacing: -0.03em; margin-top: 0.9rem; }
  .note { display: flex; gap: 0.7rem; padding: 0.8rem 0.85rem; border-radius: 0.85rem; background: oklch(0.21 0.017 335); align-items: center; }
  .note b { font-weight: 500; display: block; font-size: 0.8125rem; }
  .note small { color: var(--fg-3); font-size: 0.6875rem; }
  .note__dot { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--hair); flex: none; }
  .note--hot { background: color-mix(in oklch, var(--pri) 18%, oklch(0.2 0.02 335)); outline: 1px solid color-mix(in oklch, var(--pri) 55%, transparent); }
  .note--hot .note__dot { background: var(--pri); }

  @media (min-width: 62rem) {
    .story__layout { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(2rem, 5vw, 5rem); align-items: start; }
  }
  @media (max-width: 61.99rem) {
    .story__stage { --stage-h: min(54svh, 30rem); order: -1; top: calc(var(--header-h) + 0.5rem); z-index: 5; grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr); padding: 0.9rem; background: var(--ink-900); }
    .story__stage[data-step="4"], .story__stage[data-step="6"] { grid-template-columns: minmax(0, 0fr) minmax(0, 1fr); }
    .device--stage { width: 100%; margin: 0; }
    .step { padding-block: clamp(2rem, 11vh, 5rem); max-width: none; }
    .phone { width: min(100%, 12.5rem); border-radius: 2rem; }
    .phone__screen { border-radius: 1.6rem; padding: 0.7rem 0.7rem 0.8rem; font-size: 0.75rem; gap: 0.55rem; }
    .phone__status { display: none; }
    .phone__screen { padding-top: 1.7rem; }
    .phone__screen::before { width: 3rem; height: 0.85rem; }
    .ring { width: 88%; margin-top: 0.4rem; }
    .ring__in b { font-size: 1.75rem; }
    .ring__in small { font-size: 0.625rem; }
    .menu-head { margin-top: 0.2rem; }
    .staff-title { margin-top: 0.2rem; }
    .note { padding: 0.6rem 0.65rem; }
    .note b { font-size: 0.75rem; }
    .stage__count { display: none; }
  }
}

/* ═════════ device band, POS tabs, topology ═════════ */
@layer sections {
  .lcd-flat { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; border-radius: 0.9rem; border: 0.45rem solid oklch(0.075 0.01 335); box-shadow: 0 1.5rem 3rem -1.2rem rgb(0 0 0 / 0.85), 0 0 0 1px var(--hair); background: #0a0a0a; }

  .screens { display: grid; gap: clamp(2rem, 4vw, 3rem) clamp(1.25rem, 2.4vw, 2.25rem); grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .screens li { display: grid; align-content: start; gap: 0.35rem; }
  .screens .lcd-flat { margin-bottom: 1.1rem; }
  .screens__n { font-size: var(--t-0); letter-spacing: 0.14em; color: var(--pri-hi); }
  .screens h3 { font-size: var(--t-3); letter-spacing: -0.025em; }
  .screens p { color: var(--fg-2); font-size: var(--t-1); line-height: 1.6; }
  @media (min-width: 62rem) { .screens { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
  @media (max-width: 34rem) { .screens { grid-template-columns: minmax(0, 1fr); } }

  .facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: clamp(3rem, 6vw, 5rem); border-top: 1px solid var(--line); }
  .facts > div { padding: 1.4rem 1.5rem 1.4rem 0; border-bottom: 1px solid var(--line); }
  .facts dt { font-weight: 600; letter-spacing: -0.02em; margin-bottom: 0.3rem; }
  .facts dd { color: var(--fg-2); font-size: var(--t-1); line-height: 1.6; max-width: 26rem; }
  @media (min-width: 62rem) { .facts { grid-template-columns: repeat(4, minmax(0, 1fr)); } .facts > div { border-bottom: 0; padding-right: 2rem; } }
  @media (max-width: 40rem) { .facts { grid-template-columns: minmax(0, 1fr); } }
  .more { margin-top: clamp(2rem, 4vw, 3rem); }

  /* tabs */
  .tabs { display: grid; gap: 1.5rem; }
  .tabs__list { display: flex; gap: 0.35rem; overflow-x: auto; scrollbar-width: none; scroll-snap-type: x proximity; margin-inline: calc(var(--gutter) * -1); padding-inline: var(--gutter); }
  .tabs__list::-webkit-scrollbar { display: none; }
  .tabs__list button { scroll-snap-align: start; flex: none; display: flex; align-items: baseline; gap: 0.7em; padding: 0.8rem 1.1rem; border-radius: var(--r-s); font-size: var(--t-1); font-weight: 500; color: var(--fg-3); border: 1px solid transparent; transition: color 0.2s, background-color 0.2s, border-color 0.2s; white-space: nowrap; }
  .tabs__list button .num { font-size: var(--t-0); letter-spacing: 0.1em; color: var(--fg-3); }
  .tabs__list button:hover { color: var(--fg); }
  .tabs__list button[aria-selected="true"] { color: var(--fg); background: var(--ink-800); border-color: var(--hair); }
  .tabs__list button[aria-selected="true"] .num { color: var(--pri-hi); }
  .tabs__panels > div:not([hidden]) { animation: panel-in 0.7s var(--ease); }
  @keyframes panel-in { from { opacity: 0; transform: translateY(14px); } }
  .tabs__cap { margin-top: 1.5rem; color: var(--fg-2); max-width: 44rem; }
  .tabs__cap b { color: var(--fg); font-weight: 600; }
  @media (min-width: 62rem) {
    .tabs { grid-template-columns: 13.5rem minmax(0, 1fr); gap: clamp(2rem, 4vw, 4rem); align-items: start; }
    .tabs__list { flex-direction: column; overflow: visible; margin: 0; padding: 0; position: sticky; top: calc(var(--header-h) + 2rem); }
    .tabs__list button { padding: 0.95rem 1.1rem; }
  }
  .notes { display: grid; gap: 1.25rem 2.5rem; margin-top: clamp(3rem, 5vw, 4.5rem); padding-top: 1.75rem; border-top: 1px solid var(--line); }
  .notes li { color: var(--fg-2); font-size: var(--t-1); line-height: 1.6; }
  .notes b { display: block; color: var(--fg); font-weight: 600; margin-bottom: 0.2rem; }
  @media (min-width: 52rem) { .notes { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

  /* topology */
  .topo { display: grid; gap: 1rem; grid-template-columns: minmax(0, 1fr); align-items: stretch; }
  .topo__col { display: grid; gap: 0.75rem; align-content: start; }
  .topo__label { font-size: var(--t-0); letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-3); margin-bottom: 0.15rem; }
  .node { display: grid; gap: 0.15rem; padding: 1rem 1.15rem; border: 1px solid var(--hair); border-radius: var(--r-m); background: var(--ink-850); }
  .node b { font-weight: 600; letter-spacing: -0.015em; }
  .node span { color: var(--fg-3); font-size: var(--t-1); line-height: 1.45; }
  .node--soft { background: transparent; border-style: dashed; }
  .node--core { padding: 1.5rem; border-color: var(--pri); background: color-mix(in oklch, var(--pri) 8%, var(--ink-850)); }
  .node--core b { font-size: var(--t-3); }
  .node--core span { color: var(--fg-2); }
  .topo__row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; }
  .topo__row .node { padding: 0.85rem 1rem; }
  .topo__link { display: grid; place-items: center; min-height: 2.5rem; }
  .topo__link i { display: block; width: 1px; height: 100%; min-height: 2.5rem; background: repeating-linear-gradient(to bottom, var(--pri) 0 5px, transparent 5px 10px); }
  @media (min-width: 62rem) {
    .topo { grid-template-columns: minmax(0, 1fr) 4.5rem minmax(0, 1.55fr) 4.5rem minmax(0, 1fr); gap: 0; }
    .topo__link { min-height: 0; align-self: start; margin-top: 5.15rem; }
    .topo__link i { width: 100%; height: 1px; min-height: 0; background: repeating-linear-gradient(to right, var(--pri) 0 5px, transparent 5px 10px); }
    .topo__row { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .topo__col { padding-block: 0.25rem; }
  }
  .claims { display: grid; gap: 2.25rem; margin-top: clamp(3rem, 6vw, 5rem); }
  .claims li { border-top: 1px solid var(--line); padding-top: 1.4rem; }
  .claims h3 { font-size: var(--t-3); letter-spacing: -0.025em; line-height: 1.2; margin-bottom: 0.7rem; }
  .claims p { color: var(--fg-2); font-size: var(--t-1); line-height: 1.65; }
  @media (min-width: 52rem) { .claims { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2.5rem; } }
}

/* ═════════ business model + calculator (paper) ═════════ */
@layer sections {
  .plans { display: grid; gap: 2rem; }
  .plan { border-top: 2px solid var(--fg); padding-top: 1.4rem; display: grid; align-content: start; gap: 0.8rem; }
  .plan--lead { border-top: 5px solid var(--pri-paper); }
  .plan__tag { font-size: var(--t-0); letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-text); font-weight: 600; }
  .plan h3 { font-size: var(--t-4); letter-spacing: -0.035em; line-height: 1.05; }
  .plan p:not(.plan__tag) { color: var(--fg-2); }
  .plan dl { margin-top: 0.6rem; padding-top: 1rem; border-top: 1px solid var(--line); display: grid; gap: 0.2rem; }
  .plan dt { font-size: var(--t-0); letter-spacing: 0.12em; text-transform: uppercase; color: var(--fg-3); }
  .plan dd { font-weight: 500; }
  @media (min-width: 62rem) { .plans { grid-template-columns: 1.15fr 1fr 1fr; gap: 2.75rem; } }

  .share { margin-top: clamp(3.5rem, 7vw, 6rem); display: grid; gap: 1.75rem; }
  .share h3 { font-size: var(--t-4); letter-spacing: -0.035em; }
  .share ol { display: grid; gap: 1.5rem; counter-reset: s; }
  .share li { display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: baseline; align-content: start; }
  .share li .num { display: grid; place-items: center; width: 2.1rem; height: 2.1rem; border-radius: 50%; border: 1px solid var(--fg); font-size: var(--t-1); font-weight: 500; flex: none; }
  .share p { color: var(--fg-2); }
  .share b { color: var(--fg); font-weight: 600; }
  @media (min-width: 62rem) { .share { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 4rem; align-items: start; } .share ol { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; } .share li { grid-template-columns: 1fr; gap: 0.9rem; } }

  .calc { margin-top: clamp(3.5rem, 7vw, 6rem); display: grid; border-radius: var(--r-l); background: var(--paper-2); border: 1px solid var(--paper-hair); overflow: hidden; }
  .calc__in, .calc__out { padding: clamp(1.5rem, 1rem + 2.4vw, 3rem); }
  .calc__in { display: grid; gap: 1.5rem; align-content: start; }
  .calc__in h3 { font-size: var(--t-4); letter-spacing: -0.035em; }
  .calc__lead { color: var(--fg-2); font-size: var(--t-1); max-width: 30rem; margin-top: -0.5rem; }
  .field { display: grid; grid-template-columns: 1fr auto; gap: 0.35rem 1rem; align-items: baseline; }
  .field label { font-size: var(--t-1); font-weight: 500; }
  .field output { font-size: var(--t-3); font-weight: 600; letter-spacing: -0.03em; }
  .field input { grid-column: 1 / -1; }
  input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 1.6rem; background: transparent; cursor: pointer; --fill: 50%; }
  input[type="range"]::-webkit-slider-runnable-track { height: 4px; border-radius: 4px; background: linear-gradient(to right, var(--paper-ink) var(--fill), var(--paper-hair) var(--fill)); }
  input[type="range"]::-moz-range-track { height: 4px; border-radius: 4px; background: var(--paper-hair); }
  input[type="range"]::-moz-range-progress { height: 4px; border-radius: 4px; background: var(--paper-ink); }
  input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 1.4rem; height: 1.4rem; margin-top: calc((4px - 1.4rem) / 2); border-radius: 50%; background: var(--pri-paper); border: 3px solid var(--paper-2); box-shadow: 0 0 0 1px var(--pri-paper); transition: transform 0.2s var(--ease); }
  input[type="range"]::-moz-range-thumb { width: 1.1rem; height: 1.1rem; border-radius: 50%; background: var(--pri-paper); border: 3px solid var(--paper-2); box-shadow: 0 0 0 1px var(--pri-paper); }
  input[type="range"]:active::-webkit-slider-thumb { transform: scale(1.15); }
  input[type="range"]:focus-visible { outline-offset: 6px; border-radius: 8px; }
  .calc__out { background: var(--paper-ink); color: var(--paper); display: grid; align-content: center; gap: 1.25rem; --fg: var(--paper); --fg-2: oklch(0.82 0.02 345); --fg-3: oklch(0.68 0.025 340); --line: oklch(0.34 0.03 335); }
  .calc__k { font-size: var(--t-0); letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-3); }
  .calc__big { font-size: clamp(2.75rem, 1.5rem + 5vw, 5.25rem); font-weight: 600; letter-spacing: -0.05em; line-height: 0.95; color: var(--pri); }
  .split { display: flex; height: 0.5rem; border-radius: 99px; overflow: hidden; gap: 3px; }
  .split i { display: block; height: 100%; transition: flex-grow 0.6s var(--ease); }
  .split i:first-child { background: var(--pri); flex-grow: 50; }
  .split i:last-child { background: oklch(0.45 0.04 335); flex-grow: 50; }
  .calc__rows { display: grid; }
  .calc__rows > div { display: flex; justify-content: space-between; gap: 1rem; padding: 0.8rem 0; border-top: 1px solid var(--line); font-size: var(--t-1); }
  .calc__rows dt { color: var(--fg-2); }
  .calc__rows dd { font-weight: 600; }
  .calc__note { font-size: var(--t-0); color: var(--fg-3); line-height: 1.55; }
  .calc__out .btn { justify-self: start; --b-bg: var(--pri); --b-fg: var(--pri-ink); --b-bd: var(--pri); }
  @media (min-width: 62rem) { .calc { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
}

/* ═════════ setup path, team, faq, cta ═════════ */
@layer sections {
  .path { display: grid; gap: 2rem; counter-reset: p; position: relative; }
  .path li { border-top: 1px solid var(--line); padding-top: 1.3rem; display: grid; gap: 0.6rem; align-content: start; }
  .path .num { font-size: var(--t-0); letter-spacing: 0.14em; color: var(--pri-hi); }
  .path h3 { font-size: var(--t-4); letter-spacing: -0.035em; }
  .path p { color: var(--fg-2); font-size: var(--t-1); line-height: 1.65; max-width: 22rem; }
  @media (min-width: 52rem) { .path { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(1.5rem, 3vw, 3rem); } .path h3 { font-size: var(--t-3); } }

  .team { display: grid; gap: 2.5rem; }
  .team li { display: grid; gap: 0.15rem; align-content: start; }
  .team__ini { display: grid; place-items: center; width: 4.6rem; height: 4.6rem; margin-bottom: 1.1rem; border-radius: 1rem; background: var(--ink-700); border: 1px solid var(--hair); font-weight: 600; letter-spacing: -0.03em; font-size: 1.35rem; position: relative; }
  .team__ini::after { content: ""; position: absolute; right: -0.28rem; top: -0.28rem; width: 0.55rem; height: 0.55rem; background: var(--pri); }
  .team h3 { font-size: var(--t-3); letter-spacing: -0.025em; }
  .team__role { color: var(--pri-hi); font-size: var(--t-1); font-weight: 500; }
  .team p { color: var(--fg-2); font-size: var(--t-1); }
  .team small { color: var(--fg-3); font-size: var(--t-0); margin-top: 0.25rem; }
  @media (min-width: 52rem) { .team { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 3rem; } }

  .faq-wrap { max-width: 62rem; }
  .faq { border-top: 1px solid var(--line); }
  .faq details { border-bottom: 1px solid var(--line); }
  .faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 1.5rem; padding: 1.5rem 0; font-size: var(--t-3); font-weight: 500; letter-spacing: -0.02em; line-height: 1.3; transition: color 0.2s; }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary:hover { color: var(--accent-text); }
  .faq summary::after { content: ""; flex: none; width: 1.05rem; height: 1.05rem; background: linear-gradient(currentColor, currentColor) center / 100% 2px no-repeat, linear-gradient(currentColor, currentColor) center / 2px 100% no-repeat; transition: transform 0.45s var(--ease); }
  .faq details[open] summary::after { transform: rotate(135deg); }
  .faq details > div { padding: 0 0 1.75rem; max-width: 44rem; color: var(--fg-2); }
  @supports (interpolate-size: allow-keywords) {
    :root { interpolate-size: allow-keywords; }
    .faq details::details-content { height: 0; overflow: clip; transition: height 0.5s var(--ease), content-visibility 0.5s allow-discrete; }
    .faq details[open]::details-content { height: auto; }
  }

  /* demo form */
  .cta { background: var(--ink-950); overflow: clip; isolation: isolate; }
  .cta__bg { position: absolute; inset: 0; z-index: -1; pointer-events: none; background: radial-gradient(50% 70% at 85% 30%, oklch(0.24 0.06 335), transparent 70%), radial-gradient(circle at center, oklch(0.36 0.03 335) 0.9px, transparent 1.6px) 0 0 / 24px 24px; -webkit-mask-image: radial-gradient(90% 90% at 70% 40%, #000 15%, transparent 75%); mask-image: radial-gradient(90% 90% at 70% 40%, #000 15%, transparent 75%); opacity: 0.85; }
  .cta__grid { display: grid; gap: clamp(2.5rem, 5vw, 5rem); align-items: start; }
  .cta__copy { display: grid; gap: 1.4rem; justify-items: start; }
  .cta__copy h2 { font-size: var(--t-5); }
  .cta__points { display: grid; gap: 0.6rem; margin-top: 0.5rem; }
  .cta__points li { display: flex; gap: 0.8rem; align-items: baseline; color: var(--fg-2); }
  .cta__points li::before { content: ""; width: 0.45rem; height: 0.45rem; background: var(--pri); flex: none; translate: 0 -0.12em; }
  .form { display: grid; gap: 1.25rem; padding: clamp(1.25rem, 1rem + 1.6vw, 2.25rem); border: 1px solid var(--hair); border-radius: var(--r-l); background: color-mix(in oklch, var(--ink-850) 90%, transparent); }
  .form__grid { display: grid; gap: 1rem; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fld { display: grid; gap: 0.4rem; min-width: 0; }
  .fld--wide { grid-column: 1 / -1; }
  .fld label { font-size: var(--t-0); letter-spacing: 0.05em; color: var(--fg-2); font-weight: 500; }
  .fld input, .fld select, .fld textarea { width: 100%; min-height: 3.1rem; padding: 0.8rem 1rem; border-radius: 0.7rem; border: 1px solid var(--hair); background: var(--ink-900); color: var(--fg); transition: border-color 0.2s, background-color 0.2s; font-size: var(--t-2); }
  .fld textarea { resize: vertical; min-height: 5.5rem; }
  .fld select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--fg-2) 50%), linear-gradient(135deg, var(--fg-2) 50%, transparent 50%); background-position: calc(100% - 1.25rem) 52%, calc(100% - 0.9rem) 52%; background-size: 0.4rem 0.4rem; background-repeat: no-repeat; padding-right: 2.5rem; }
  .fld input::placeholder { color: var(--fg-3); }
  .fld input:hover, .fld select:hover, .fld textarea:hover { border-color: var(--ink-600); }
  .fld input:focus-visible, .fld select:focus-visible, .fld textarea:focus-visible { outline: none; border-color: var(--pri); box-shadow: 0 0 0 3px color-mix(in oklch, var(--pri) 28%, transparent); }
  .fld.is-bad input { border-color: var(--warn); }
  .fld .err { font-size: var(--t-0); color: var(--warn); }
  .form .btn { justify-self: start; }
  .form__legal { font-size: var(--t-0); color: var(--fg-3); }
  .form__legal a { text-decoration: underline; text-underline-offset: 3px; }
  .form__status { padding: 1rem 1.15rem; border-radius: 0.7rem; background: color-mix(in oklch, var(--ok) 12%, var(--ink-850)); border: 1px solid color-mix(in oklch, var(--ok) 40%, transparent); font-size: var(--t-1); display: grid; gap: 0.6rem; }
  .form__status[hidden] { display: none; }
  .form__status pre { white-space: pre-wrap; font: inherit; font-size: var(--t-0); color: var(--fg-2); background: var(--ink-900); padding: 0.8rem 1rem; border-radius: 0.5rem; }
  .form__status .btn { justify-self: start; }
  @media (min-width: 62rem) { .cta__grid { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); } }
  @media (max-width: 34rem) { .form__grid { grid-template-columns: minmax(0, 1fr); } .fld { grid-column: 1 / -1; } }
}

/* ═════════ sub-pages ═════════ */
@layer sections {
  .page-hero { position: relative; isolation: isolate; overflow: clip; padding: calc(var(--header-h) + clamp(3rem, 2rem + 6vw, 7rem)) 0 clamp(3rem, 2rem + 4vw, 6rem); background: var(--ink-900); }
  .page-hero::before { content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none; background: radial-gradient(48% 70% at 82% 40%, oklch(0.22 0.04 335), transparent 72%), radial-gradient(circle at center, oklch(0.38 0.03 335) 0.9px, transparent 1.6px) 0 0 / 24px 24px; -webkit-mask-image: radial-gradient(90% 100% at 75% 40%, #000 10%, transparent 75%); mask-image: radial-gradient(90% 100% at 75% 40%, #000 10%, transparent 75%); opacity: 0.8; }
  .page-hero__in { display: grid; gap: clamp(1.25rem, 2.4vw, 1.9rem); justify-items: start; }
  .page-hero__in > * { max-width: 56rem; }
  .page-hero h1 { font-size: clamp(2.5rem, 1rem + 5.4vw, 5.25rem); letter-spacing: -0.048em; line-height: 0.96; }
  .page-hero .lead { max-width: 40rem; }
  .page-hero__shot { position: relative; margin: 0; }
  .page-hero__shot .frame { rotate: 1.5deg; box-shadow: 0 3rem 6rem -2rem rgb(0 0 0 / 0.85), 0 0 8rem -2rem color-mix(in oklch, var(--pri) 24%, transparent), inset 0 0 0 1px rgb(255 255 255 / 0.03); }
  .page-hero__cta { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; align-items: center; margin-top: 0.4rem; }
  .page-hero--split .container { display: grid; gap: 2.5rem; align-items: center; }
  @media (min-width: 62rem) { .page-hero--split .container { grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); } }

  .prose { max-width: 44rem; }
  .prose > * + * { margin-top: 1.1rem; }
  .prose h2 { font-size: var(--t-4); letter-spacing: -0.035em; margin-top: 2.75rem; }
  .prose h3 { font-size: var(--t-3); letter-spacing: -0.025em; margin-top: 2rem; }
  .prose p, .prose li { color: var(--fg-2); }
  .prose ul { display: grid; gap: 0.5rem; padding-left: 1.2rem; list-style: none; }
  .prose ul li { position: relative; }
  .prose ul li::before { content: ""; position: absolute; left: -1.2rem; top: 0.72em; width: 0.4rem; height: 0.4rem; background: var(--pri); }
  .prose a { color: var(--fg); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--pri); }
  .prose a:hover { color: var(--accent-text); }
  .prose strong { color: var(--fg); }

  .two { display: grid; gap: clamp(2rem, 4vw, 4rem); }
  @media (min-width: 62rem) { .two { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); align-items: start; } .two--even { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

  .tbl { width: 100%; border-collapse: collapse; font-size: var(--t-1); }
  .tbl caption { text-align: left; padding-bottom: 1rem; font-size: var(--t-0); letter-spacing: 0.12em; text-transform: uppercase; color: var(--fg-3); }
  .tbl th, .tbl td { text-align: left; vertical-align: top; padding: 1rem 1rem 1rem 0; border-top: 1px solid var(--line); }
  .tbl tr:last-child td, .tbl tr:last-child th { border-bottom: 1px solid var(--line); }
  .tbl th { font-weight: 600; color: var(--fg); width: 30%; }
  .tbl td { color: var(--fg-2); }
  .tag { display: inline-block; padding: 0.15rem 0.6rem; border-radius: 99px; font-size: var(--t-0); font-weight: 500; border: 1px solid var(--line); color: var(--fg-2); white-space: nowrap; }
  .tag--no { color: var(--ok); border-color: color-mix(in oklch, var(--ok) 45%, transparent); }
  .tag--yes { color: var(--pri-hi); border-color: color-mix(in oklch, var(--pri) 50%, transparent); }
  @media (max-width: 40rem) { .tbl, .tbl tbody, .tbl tr, .tbl th, .tbl td { display: block; width: 100%; } .tbl tr { padding: 1rem 0; border-top: 1px solid var(--line); } .tbl th, .tbl td { border: 0 !important; padding: 0.2rem 0; } }

  .channels { display: grid; gap: 1rem; }
  .channel { display: grid; gap: 0.3rem; padding: 1.4rem 1.5rem; border: 1px solid var(--hair); border-radius: var(--r-m); background: var(--ink-850); transition: border-color 0.25s, transform 0.4s var(--ease); }
  a.channel:hover { border-color: var(--pri); transform: translateY(-2px); }
  .channel small { font-size: var(--t-0); letter-spacing: 0.12em; text-transform: uppercase; color: var(--fg-3); }
  .channel b { font-size: var(--t-3); letter-spacing: -0.02em; }
  .channel span { color: var(--fg-2); font-size: var(--t-1); }
  @media (min-width: 52rem) { .channels { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

  .callout { padding: clamp(1.4rem, 1rem + 2vw, 2.5rem); border: 1px solid var(--hair); border-radius: var(--r-l); background: var(--ink-850); display: grid; gap: 0.9rem; }
  .callout h3 { font-size: var(--t-4); letter-spacing: -0.035em; }
  .callout p { color: var(--fg-2); }
  .bleed-note { font-size: var(--t-0); color: var(--fg-3); max-width: 44rem; line-height: 1.6; }
}

/* ═════════ /cihaz/ viewer, explorer, closing band ═════════ */
@layer sections {
  .device--viewer { aspect-ratio: 14 / 11; margin-inline: -4%; width: 108%; }
  .device--viewer .device__hint { bottom: auto; top: 1%; }
  .hs-list { display: grid; width: 100%; max-width: 34rem; border-top: 1px solid var(--line); margin-top: 0.5rem; }
  .hs-list li { border-bottom: 1px solid var(--line); }
  .hs-item { width: 100%; display: grid; grid-template-columns: 2rem 1fr; gap: 0.2rem 0.9rem; align-items: baseline; padding: 1rem 0; text-align: left; color: var(--fg-3); transition: color 0.25s; }
  .hs-item .num { font-size: var(--t-0); letter-spacing: 0.1em; }
  .hs-item b { font-weight: 600; font-size: var(--t-3); letter-spacing: -0.025em; color: inherit; }
  .hs-item > span:last-child { grid-column: 2; display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.5s var(--ease); color: var(--fg-2); font-size: var(--t-1); line-height: 1.6; }
  .hs-item > span:last-child > span { overflow: hidden; }
  .hs-item:hover { color: var(--fg-2); }
  .hs-item.is-on { color: var(--fg); }
  .hs-item.is-on .num { color: var(--pri-hi); }
  .hs-item.is-on > span:last-child { grid-template-rows: 1fr; padding-top: 0.35rem; }

  .hs { position: absolute; left: 0; top: 0; z-index: 3; width: 2.1rem; height: 2.1rem; margin: -1.05rem 0 0 -1.05rem; border-radius: 50%; display: grid; place-items: center; font-size: var(--t-0); font-weight: 600; color: var(--fg); background: oklch(0.12 0.015 335 / 0.88); border: 1px solid var(--pri); transition: opacity 0.35s, scale 0.35s var(--ease), background-color 0.25s, color 0.25s; will-change: transform; opacity: 0; pointer-events: none; }
  .device.is-live .hs { opacity: 1; pointer-events: auto; }
  .hs::after { content: ""; position: absolute; inset: -0.4rem; border-radius: 50%; border: 1px solid var(--pri); opacity: 0; animation: ring 2.6s var(--ease) infinite; }
  @keyframes ring { 0% { opacity: 0.7; scale: 0.7; } 100% { opacity: 0; scale: 1.5; } }
  .hs.is-on { background: var(--pri); color: var(--pri-ink); scale: 1.12; }
  .hs.is-on::after { animation: none; }
  .device .hs.is-away { opacity: 0; pointer-events: none; }
  .hs:hover { scale: 1.15; }

  .lcdx { display: grid; gap: clamp(1.75rem, 3vw, 3rem); align-items: center; }
  .lcdx__list { display: flex; flex-wrap: wrap; gap: 0.5rem; }
  .lcdx__list button { padding: 0.6rem 1rem; border-radius: 99px; border: 1px solid var(--hair); font-size: var(--t-1); font-weight: 500; color: var(--fg-2); transition: color 0.2s, border-color 0.2s, background-color 0.2s; }
  .lcdx__list button:hover { color: var(--fg); border-color: var(--fg-3); }
  .lcdx__list button.is-on { background: var(--fg); border-color: var(--fg); color: var(--ink-900); }
  .lcdx__screen { display: grid; gap: 1.4rem; max-width: 36rem; }
  .lcdx__screen .lcd-flat { box-shadow: 0 2.5rem 5rem -1.5rem rgb(0 0 0 / 0.9), 0 0 0 1px var(--hair), 0 0 6rem -1rem color-mix(in oklch, var(--pri) 22%, transparent); }
  .lcdx__screen h3 { font-size: var(--t-4); letter-spacing: -0.035em; }
  .lcdx__screen p { color: var(--fg-2); max-width: 34rem; min-height: 5.2em; }
  @media (min-width: 62rem) { .lcdx { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); } .lcdx__list { flex-direction: column; align-items: flex-start; } .lcdx__list button { padding: 0.7rem 1.15rem; } }

  .band { position: relative; padding-block: clamp(4rem, 3rem + 5vw, 8rem); background: var(--ink-950); border-top: 1px solid var(--hair-soft); overflow: clip; isolation: isolate; }
  .band::before { content: ""; position: absolute; inset: 0; z-index: -1; background: radial-gradient(45% 90% at 85% 50%, oklch(0.23 0.06 335), transparent 70%); }
  .band__in { display: grid; gap: 1.75rem; justify-items: start; max-width: 46rem; }
  .band h2 { font-size: var(--t-5); }
  .band__cta { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; align-items: center; }
}

@layer sections {
  .claims--grid { gap: 2.75rem 2.5rem; }
  @media (min-width: 52rem) { .claims--grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
  @media (min-width: 40rem) and (max-width: 51.99rem) { .claims--grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
  .claims--grid + .bleed-note { margin-top: 3rem; }
  .steps-min { display: grid; gap: 1.25rem; }
  .steps-min li { display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: baseline; }
  .steps-min .num { display: grid; place-items: center; width: 2rem; height: 2rem; border-radius: 50%; border: 1px solid var(--pri); color: var(--pri-hi); font-size: var(--t-1); font-weight: 500; }
  .steps-min p { color: var(--fg-2); }
  .steps-min b { color: var(--fg); font-weight: 600; }
}