/* Geist + Geist Mono, self-hosted (variable, weights 100–900). SIL OFL. */
    @font-face {
      font-family: 'Geist';
      font-style: normal;
      font-weight: 100 900;
      font-display: swap;
      src: url(fonts/geist-latin.woff2) format('woff2');
      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;
    }
    @font-face {
      font-family: 'Geist';
      font-style: normal;
      font-weight: 100 900;
      font-display: swap;
      src: url(fonts/geist-latin-ext.woff2) format('woff2');
      unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
    }
    @font-face {
      font-family: 'Geist Mono';
      font-style: normal;
      font-weight: 100 900;
      font-display: swap;
      src: url(fonts/geist-mono-latin.woff2) format('woff2');
      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;
    }
    @font-face {
      font-family: 'Geist Mono';
      font-style: normal;
      font-weight: 100 900;
      font-display: swap;
      src: url(fonts/geist-mono-latin-ext.woff2) format('woff2');
      unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
    }
  

    :root {
      --bg: #000000;
      --fg: #ffffff;
      --muted: rgba(255, 255, 255, 0.7);
      --dim: rgba(255, 255, 255, 0.56);
      --line: rgba(255, 255, 255, 0.15);
      --line-strong: rgba(255, 255, 255, 0.35);
      --display: "Geist", "Inter", sans-serif;
      --mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
      --space-2: 0.5rem;
      --space-3: 0.75rem;
      --space-4: 1rem;
      --space-5: 1.25rem;
      --space-6: 1.5rem;
      --space-8: 2rem;
      --space-10: 2.5rem;
      --space-12: 3rem;
      --text-base: 1.125rem;
      --text-base-lh: 1.75rem;
      --ease: cubic-bezier(0.2, 0.72, 0.2, 1);
    }

    * { box-sizing: border-box; }

    html, body {
      margin: 0;
      padding: 0;
      background: var(--bg);
      color: var(--fg);
      font-family: var(--display);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }
    html { scrollbar-gutter: stable; scroll-behavior: smooth; }
    @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
    body { position: relative; overflow-x: hidden; }
    a { color: inherit; }

    .mesh-canvas {
      position: fixed;
      inset: 0;
      width: 100%;
      height: 100%;
      z-index: 0;
      pointer-events: none;
      opacity: 0.95;
      filter: brightness(0.83) contrast(0.89);
    }

    body::before,
    body::after {
      content: "";
      position: fixed;
      pointer-events: none;
      z-index: 0;
      border: 1px solid var(--line);
      border-radius: 999px;
    }
    body::before { inset: -20% auto auto -10%; width: 58vw; height: 58vw; opacity: 0.35; transform: rotate(-12deg); }
    body::after { inset: auto -15% -25% auto; width: 66vw; height: 66vw; opacity: 0.2; transform: rotate(16deg); }

    main { position: relative; z-index: 1; }

    .wrap {
      width: min(1560px, 100%);
      margin-inline: auto;
      padding-inline: clamp(2.4rem, 4.8vw, 5rem);
    }
    @media (max-width: 680px) { .wrap { padding-inline: clamp(1rem, 5vw, 1.5rem); } }

    /* ── the wordmark, exactly as on the home page ── */
    .bklt-wordmark {
      margin: 0;
      font-family: var(--display);
      line-height: 0.9;
      font-weight: 900;
      letter-spacing: -0.02em;
      font-variation-settings: "wght" 950;
      white-space: nowrap;
    }
    .bklt-sticky-logo {
      position: fixed;
      top: 20px;
      left: clamp(2.4rem, 4.8vw, 5rem);
      z-index: 10;
      isolation: isolate;
      mix-blend-mode: difference;
      color: #ffffff;
      text-decoration: none;
    }
    .bklt-sticky-logo .bklt-wordmark { font-size: clamp(2.35rem, 3.5vw, 4rem); line-height: 1; }
    @media (max-width: 680px) { .bklt-sticky-logo { left: clamp(1rem, 5vw, 1.5rem); } .bklt-sticky-logo .bklt-wordmark { font-size: 2.1rem; } }
    @media (min-width: 1560px) { .bklt-sticky-logo { left: calc((100vw - 1560px) / 2 + 5rem); } }

    .top-nav {
      position: fixed;
      top: 30px;
      right: clamp(2.4rem, 4.8vw, 5rem);
      z-index: 10;
      display: flex;
      gap: clamp(1rem, 2vw, 2rem);
      mix-blend-mode: difference;
      font-family: var(--mono);
      font-size: 0.72rem;
      letter-spacing: 0.14em;
      text-transform: uppercase;
    }
    .top-nav a { text-decoration: none; color: #fff; opacity: 0.7; transition: opacity 200ms ease; }
    .top-nav a:hover { opacity: 1; }
    @media (max-width: 900px) { .top-nav { display: none; } }

    /* ── type ── */
    .chapter-id {
      margin: 0 0 var(--space-5);
      font-family: var(--mono);
      font-size: 0.75rem;
      line-height: 1rem;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: #ffffff;
    }
    .chapter-id span { color: var(--dim); }
    h1, h2, h3 { margin: 0; }
    .chapter h2 {
      font-size: 2rem;
      line-height: 2.5rem;
      letter-spacing: -0.02em;
      text-transform: uppercase;
      max-width: 24ch;
      font-weight: 530;
    }
    @media (min-width: 760px) { .chapter h2 { font-size: 2.75rem; line-height: 3rem; } }
    @media (min-width: 1100px) { .chapter h2 { font-size: 3.5rem; line-height: 4rem; } }
    @media (max-width: 680px) { .chapter h2 { font-size: 1.55rem; line-height: 1.22; } }
    h3 {
      font-size: clamp(1.2rem, 1.6vw, 1.45rem);
      line-height: 1.2;
      letter-spacing: -0.015em;
      text-transform: uppercase;
      font-weight: 530;
    }
    .chapter-subline, .copy {
      margin: var(--space-4) 0 0;
      max-width: 52ch;
      font-size: var(--text-base);
      line-height: var(--text-base-lh);
      text-wrap: pretty;
    }
    .copy p { margin: 0 0 1rem; }
    .copy p:last-child { margin-bottom: 0; }
    .muted { color: var(--muted); }

    .chapter { position: relative; padding-block: clamp(4rem, 12vh, 8.5rem); }
    @media (max-width: 680px) { .chapter { padding-block: 3.2rem; } }

    /* ── hero ── */
    .hero {
      min-height: 100vh;
      min-height: 100svh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding-top: 7rem;
      padding-bottom: clamp(2rem, 5vh, 3.5rem);
    }
    .hero-eyebrow { margin-bottom: var(--space-6); }
    .hero-headline {
      font-size: clamp(3rem, 12vw, 11rem);
      font-weight: 560;
      letter-spacing: -0.02em;
      line-height: 0.96;
      text-transform: uppercase;
    }
    .hero-headline span { display: block; overflow: hidden; padding-bottom: 0.04em; }
    .hero-headline span i {
      font-style: normal;
      display: inline-block;
      transform: translateY(104%);
      animation: rise 1.1s var(--ease) forwards;
    }
    .hero-headline span:nth-child(2) i { animation-delay: 0.12s; }
    @keyframes rise { to { transform: none; } }
    @keyframes fade { to { opacity: 1; } }
    .hero-kicker {
      margin: var(--space-8) 0 0;
      font-size: clamp(1.58rem, 4.4vw, 4.2rem);
      line-height: 1.04;
      letter-spacing: -0.01em;
      max-width: 22ch;
      opacity: 0;
      animation: fade 1s 0.5s var(--ease) forwards;
    }
    .hero-row {
      display: grid;
      grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
      gap: clamp(1.5rem, 4vw, 5rem);
      align-items: end;
      margin-top: clamp(2rem, 5vh, 3.5rem);
    }
    .hero-row .copy { margin: 0; opacity: 0; animation: fade 1s 0.8s var(--ease) forwards; }
    @media (max-width: 900px) { .hero-row { grid-template-columns: 1fr; } }

    /* ── master frame: the site's 16:9 frame with inset rule and notch ── */
    .frame {
      position: relative;
      width: 100%;
      background: #050505;
      border: 1px solid rgba(255, 255, 255, 0.34);
      overflow: hidden;
    }
    .frame::before {
      content: "";
      position: absolute;
      inset: 0.4rem;
      border: 1px solid rgba(255, 255, 255, 0.14);
      pointer-events: none;
      z-index: 2;
    }
    .frame::after {
      content: "";
      position: absolute;
      top: -1px;
      right: -1px;
      width: clamp(1rem, 2.2vw, 1.6rem);
      height: clamp(1rem, 2.2vw, 1.6rem);
      border-left: 1px solid rgba(255, 255, 255, 0.75);
      border-bottom: 1px solid rgba(255, 255, 255, 0.75);
      background: #000;
      z-index: 3;
    }
    .frame canvas { display: block; width: 100%; height: 100%; }
    .hero-frame { aspect-ratio: 2.39 / 1; opacity: 0; animation: fade 1.4s 0.25s var(--ease) forwards; }
    @media (max-width: 680px) { .hero-frame { aspect-ratio: 4 / 3; } }

    .hud {
      position: absolute;
      z-index: 4;
      font-family: var(--mono);
      font-size: clamp(0.58rem, 0.8vw, 0.7rem);
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: rgba(255, 255, 255, 0.78);
      pointer-events: none;
      line-height: 1.6;
    }
    .hud.tl { top: 1.1rem; left: 1.25rem; }
    .hud.tr { top: 1.1rem; right: 2.6rem; text-align: right; }
    .hud.bl { bottom: 1.1rem; left: 1.25rem; }
    .hud.br { bottom: 1.1rem; right: 1.25rem; text-align: right; }
    @media (max-width: 680px) { .demo-stage .hud.bl, .hero-frame .hud.br { display: none; } }
    .rec::before {
      content: "";
      display: inline-block;
      width: 0.45rem; height: 0.45rem;
      margin-right: 0.5rem;
      background: #fff;
      vertical-align: 0.05rem;
      animation: blink 1.4s steps(2) infinite;
    }
    @keyframes blink { 50% { opacity: 0.15; } }

    /* ── reveals, as on the home page ── */
    .reveal-item {
      opacity: 0;
      transform: translateY(0.8rem);
      filter: blur(0.5px);
      transition: opacity 560ms ease, transform 640ms var(--ease), filter 520ms ease;
      transition-delay: var(--reveal-delay, 0ms);
    }
    .reveal-item.is-visible { opacity: 1; transform: none; filter: none; }
    @media (prefers-reduced-motion: reduce) { .reveal-item { opacity: 1; transform: none; filter: none; transition: none; } }

    /* ── glossary ── */
    .split2 { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 7rem); }
    @media (max-width: 900px) { .split2 { grid-template-columns: 1fr; } }
    .terms { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line-strong); }
    .terms li { display: grid; grid-template-columns: 12rem 1fr; gap: 1rem; padding: 1.1rem 0; border-bottom: 1px solid var(--line); line-height: 1.55; }
    .terms li b { font-family: var(--mono); font-weight: 400; font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; padding-top: 0.2rem; }
    .terms li span { color: var(--muted); }
    @media (max-width: 680px) { .terms li { grid-template-columns: 1fr; gap: 0.3rem; } }

    /* ── explainer film ── */
    .film { aspect-ratio: 16 / 9; margin-top: clamp(2rem, 5vh, 3.5rem); }
    @media (max-width: 680px) { .film { aspect-ratio: 4 / 3; } }
    .shade { position: absolute; inset: 0; z-index: 1; pointer-events: none; background: linear-gradient(to top, rgba(0,0,0,.9) 0%, rgba(0,0,0,0) 50%); }
    .caption { position: absolute; z-index: 4; left: clamp(1.25rem, 3vw, 2.6rem); right: clamp(1.25rem, 3vw, 2.6rem); bottom: clamp(1.5rem, 4vw, 3rem); pointer-events: none; }
    .caption .n { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); }
    .caption .t { font-size: clamp(1.5rem, 4vw, 3.6rem); line-height: 1; letter-spacing: -0.02em; text-transform: uppercase; font-weight: 530; margin: 0.4rem 0 0.6rem; }
    .caption .d { margin: 0; max-width: 52ch; font-size: clamp(0.88rem, 1.2vw, 1.1rem); line-height: 1.5; color: var(--muted); }
    .caption > * { transition: opacity 0.45s ease, transform 0.6s var(--ease); }
    .caption.swap > * { opacity: 0; transform: translateY(10px); }
    @media (max-width: 680px) { .caption .d { display: none; } }
    .transport { display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: center; margin-top: 1rem; }
    .chapters { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0.5rem; }
    .chapters button {
      all: unset;
      cursor: pointer;
      position: relative;
      padding-top: 0.75rem;
      font-family: var(--mono);
      font-size: 0.7rem;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--dim);
      transition: color 0.2s ease;
    }
    .chapters button::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: var(--line-strong); }
    .chapters button i { position: absolute; top: -1px; left: 0; height: 3px; width: 0; background: #fff; }
    .chapters button.on { color: #fff; }
    .chapters button:focus-visible { outline: 1px solid #fff; outline-offset: 4px; }
    @media (max-width: 680px) { .chapters button span { display: none; } }

    /* ── controls: square, mono, like the site's buttons ── */
    .btn, .chips button {
      font-family: var(--mono);
      font-size: 0.72rem;
      letter-spacing: 0.09em;
      text-transform: uppercase;
      padding: 0.55rem 0.85rem;
      border: 1px solid var(--line-strong);
      background: transparent;
      color: var(--fg);
      cursor: pointer;
      transition: all 200ms ease;
    }
    .chips button:hover, .btn:hover { border-color: #fff; }
    .chips button.on { background: #fff; color: #000; border-color: #fff; }
    .chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }
    .play { width: 2.7rem; height: 2.7rem; padding: 0; display: grid; place-items: center; }
    .play svg { width: 12px; height: 12px; fill: currentColor; }

    .demo { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr); gap: clamp(1.5rem, 3.5vw, 4rem); margin-top: clamp(2rem, 5vh, 3.5rem); }
    @media (max-width: 1000px) { .demo { grid-template-columns: 1fr; } }
    .demo-stage { aspect-ratio: 2.39 / 1; cursor: grab; touch-action: none; }
    .demo-stage:active { cursor: grabbing; }
    @media (max-width: 680px) { .demo-stage { aspect-ratio: 16 / 10; } }
    .ctl { margin-bottom: 1.5rem; }
    .k, .ctl label:not(.toggle) {
      display: flex; justify-content: space-between;
      font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
      color: var(--dim); margin-bottom: 0.6rem;
    }
    .k output, .ctl label output { color: #fff; }
    input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 1px; background: var(--line-strong); outline: none; margin: 0.6rem 0; }
    input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 14px; height: 14px; background: #fff; cursor: pointer; border: 0; }
    input[type=range]::-moz-range-thumb { width: 14px; height: 14px; border: 0; border-radius: 0; background: #fff; cursor: pointer; }
    .toggle { display: flex; align-items: center; gap: 0.75rem; cursor: pointer; font-size: 0.95rem; color: var(--muted); user-select: none; }
    .toggle input { appearance: none; -webkit-appearance: none; margin: 0; width: 2.1rem; height: 1.1rem; border: 1px solid var(--line-strong); position: relative; cursor: pointer; }
    .toggle input::after { content: ""; position: absolute; top: 2px; left: 2px; width: calc(1.1rem - 6px); height: calc(1.1rem - 6px); background: rgba(255,255,255,.6); transition: transform 0.25s var(--ease), background 0.2s ease; }
    .toggle input:checked { border-color: #fff; }
    .toggle input:checked::after { transform: translateX(1rem); background: #fff; }
    .legend { display: flex; flex-wrap: wrap; gap: 1.4rem; margin-top: 0.9rem; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim); }
    .legend i { display: inline-block; width: 0.65rem; height: 0.65rem; margin-right: 0.5rem; vertical-align: -0.05rem; }
    .legend .m { background: rgba(255,255,255,.55); }
    .legend .g { border: 1px solid #fff; border-radius: 50%; }

    .meter { position: relative; height: 3px; background: repeating-linear-gradient(90deg, rgba(255,255,255,.5) 0 2px, transparent 2px 5px); margin-top: 0.4rem; }
    .meter i { position: absolute; left: 0; top: 0; bottom: 0; background: #fff; transition: width 0.3s var(--ease); }
    .verdict { margin-top: 0.8rem; min-height: 3em; font-size: 0.98rem; line-height: 1.5; color: var(--muted); }
    .verdict b { color: #fff; font-weight: 530; text-transform: uppercase; letter-spacing: 0.01em; }
    .card {
      margin: 0;
      padding: 1rem 1.1rem;
      border: 1px solid var(--line-strong);
      font-family: var(--mono);
      font-size: 0.74rem;
      line-height: 1.8;
      color: var(--dim);
      white-space: pre;
      overflow-x: auto;
    }
    .card b { color: #fff; font-weight: 400; }
    .card .g { color: #000; background: #fff; padding: 0 0.3em; }

    .pair { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: clamp(2rem, 5vh, 3.5rem); }
    .pair figure { margin: 0; }
    .pair .frame { aspect-ratio: 4 / 5; }
    .pair figcaption { margin-top: 0.8rem; color: var(--muted); line-height: 1.5; }
    .pair figcaption b { display: block; color: #fff; font-weight: 530; text-transform: uppercase; letter-spacing: 0.01em; }
    @media (max-width: 680px) { .pair { grid-template-columns: 1fr; } .pair .frame { aspect-ratio: 4 / 3; } }
    .push { max-width: 34rem; margin-top: 2rem; }

    /* ── lists ── */
    .grid3 { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: clamp(2rem, 5vh, 3.5rem); border-top: 1px solid var(--line-strong); }
    .grid3 article { padding: 1.8rem 1.8rem 2.2rem 0; border-bottom: 1px solid var(--line); }
    .grid3 article:not(:nth-child(3n+1)) { padding-left: 1.8rem; border-left: 1px solid var(--line); }
    .grid3 .num { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; color: var(--dim); }
    .grid3 h3 { margin: 1.2rem 0 0.7rem; }
    .grid3 p { margin: 0; color: var(--muted); line-height: 1.6; }
    @media (max-width: 1000px) {
      .grid3 { grid-template-columns: 1fr 1fr; }
      .grid3 article, .grid3 article:not(:nth-child(3n+1)) { padding: 1.6rem 1.2rem 1.8rem 0; border-left: 0; }
      .grid3 article:nth-child(2n) { padding-left: 1.2rem; border-left: 1px solid var(--line); }
    }
    @media (max-width: 600px) {
      .grid3 { grid-template-columns: 1fr; }
      .grid3 article:nth-child(2n) { padding-left: 0; border-left: 0; }
    }

    .rules { list-style: none; margin: 0; padding: 0; counter-reset: r; }
    .rules li { counter-increment: r; position: relative; padding: 1.3rem 0 1.3rem 3.2rem; border-top: 1px solid var(--line); color: var(--muted); line-height: 1.6; }
    .rules li::before { content: counter(r, decimal-leading-zero); position: absolute; left: 0; top: 1.55rem; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; color: #fff; }
    .rules li b { display: block; margin-bottom: 0.35rem; color: #fff; font-weight: 530; text-transform: uppercase; letter-spacing: 0.005em; }

    .log { align-self: start; border: 1px solid var(--line-strong); background: rgba(0,0,0,.72); font-family: var(--mono); font-size: 0.74rem; }
    .log header { display: flex; justify-content: space-between; padding: 0.9rem 1.1rem; border-bottom: 1px solid var(--line-strong); letter-spacing: 0.14em; text-transform: uppercase; font-size: 0.68rem; }
    .log ol { list-style: none; margin: 0; padding: 0; }
    .log li { display: grid; grid-template-columns: 4rem 1fr auto; gap: 1rem; padding: 0.85rem 1.1rem; border-bottom: 1px solid var(--line); color: var(--dim); line-height: 1.55; opacity: 0; transform: translateX(-8px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
    .log li:last-child { border-bottom: 0; }
    .log.is-visible li { opacity: 1; transform: none; }
    .log li b { color: #fff; font-weight: 400; }
    .tag { align-self: start; white-space: nowrap; font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; padding: 0.15rem 0.45rem; border: 1px solid var(--line-strong); color: #fff; }
    .tag.solid { background: #fff; color: #000; border-color: #fff; }
    .tag.strike { text-decoration: line-through; color: var(--dim); }
    @media (max-width: 520px) { .log li { grid-template-columns: 1fr; gap: 0.3rem; } }

    .flow-title { white-space: nowrap; }
    @media (max-width: 680px) { .flow-title { white-space: normal; } }
    .flow { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: clamp(2rem, 5vh, 3.5rem); position: relative; }
    .flow::before { content: ""; position: absolute; top: 0.35rem; left: 0; right: 0; height: 1px; background: var(--line-strong); }
    .flow div { position: relative; padding-right: 1.5rem; }
    .flow div::before { content: ""; display: block; position: relative; width: 0.7rem; height: 0.7rem; background: #fff; margin-bottom: 1.4rem; }
    .flow .when { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); }
    .flow h3 { margin: 0.6rem 0; }
    .flow p { margin: 0; color: var(--muted); line-height: 1.6; }
    @media (max-width: 900px) {
      .flow { grid-template-columns: 1fr; gap: 2rem; }
      .flow::before { top: 0; bottom: 0; left: 0.35rem; right: auto; width: 1px; height: auto; }
      .flow div { padding: 0 0 0 2.2rem; }
      .flow div::before { position: absolute; left: 0; top: 0.1rem; }
    }

    .limits { display: grid; grid-template-columns: 1fr 1fr; gap: 0 clamp(2rem, 5vw, 5rem); margin-top: clamp(2rem, 5vh, 3.5rem); }
    .limits div { border-top: 1px solid var(--line); padding: 1.3rem 0 1.6rem; }
    .limits b { display: block; margin-bottom: 0.4rem; font-weight: 530; text-transform: uppercase; }
    .limits p { margin: 0; color: var(--muted); line-height: 1.6; }
    @media (max-width: 760px) { .limits { grid-template-columns: 1fr; } }

    /* ── white overscroll panel + footer, from the home page ── */
    .overscroll-footer { margin-top: clamp(1rem, 3vh, 2.5rem); background: #fff; color: #111; position: relative; z-index: 5; }
    .overscroll-inner { width: min(1560px, 100%); margin-inline: auto; min-height: clamp(22rem, 54vh, 38rem); padding: clamp(3rem, 6vw, 4.5rem) clamp(2.4rem, 4.8vw, 5rem) clamp(2.8rem, 6.5vw, 4.5rem); }
    @media (max-width: 680px) { .overscroll-inner { padding-inline: clamp(1rem, 5vw, 1.5rem); } }
    .overscroll-kicker { margin: 0; font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase; color: rgba(17,17,17,.56); }
    .overscroll-inner h2 { margin: var(--space-5) 0 0; font-size: clamp(1.8rem, 5.6vw, 5.4rem); line-height: 1; letter-spacing: -0.02em; text-transform: uppercase; font-weight: 530; max-width: 16ch; }
    .overscroll-copy { margin-top: var(--space-6); max-width: 60ch; font-size: var(--text-base); line-height: var(--text-base-lh); color: rgba(17,17,17,.84); }
    .overscroll-copy p { margin: 0 0 1rem; }
    .book { display: inline-block; margin-top: var(--space-8); padding: 0.75rem 1.1rem; background: #111; color: #fff; border: 1px solid #111; font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.09em; text-transform: uppercase; text-decoration: none; transition: all 200ms ease; }
    .book:hover { background: #fff; color: #111; }

    .site-footer { background: #111; color: #fff; padding-block: clamp(3rem, 7vw, 5rem); position: relative; z-index: 5; }
    .site-footer-inner { width: min(1560px, 100%); margin-inline: auto; padding-inline: clamp(2.4rem, 4.8vw, 5rem); display: grid; gap: clamp(0.75rem, 1.6vw, 1.25rem); }
    @media (max-width: 680px) { .site-footer-inner { padding-inline: clamp(1rem, 5vw, 1.5rem); } }
    .site-footer-lockup { display: flex; align-items: flex-start; gap: clamp(0.45rem, 0.9vw, 0.75rem); }
    .site-footer-wordmark { font-size: clamp(2rem, 2.8vw, 3rem); }
    .site-footer-tagline { margin: calc(0.14rem + 1px) 0 0; font-size: clamp(0.85rem, 1.05vw, 1.05rem); line-height: calc(0.9em + 1px); text-transform: uppercase; font-weight: 500; display: flex; flex-direction: column; gap: 0.2rem; white-space: nowrap; }
    .site-footer-text, .site-footer-link { margin: 0; font-size: 0.92rem; line-height: 1.55; color: rgba(255,255,255,.78); text-decoration: none; }
    .site-footer-link:hover { color: #fff; }
    .site-footer-legal { margin: var(--space-6) 0 0; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em; color: rgba(255,255,255,.5); }
    .site-footer-legal a { color: inherit; text-decoration: none; }
    .site-footer-legal a:hover { color: #fff; }
  
    /* ════════ pipeline walkthrough additions ════════ */
    body { padding-bottom: 4.2rem; }
    .top-nav a.here { opacity: 1; text-decoration: underline; text-underline-offset: 0.4em; }

    .hero--page { min-height: auto; padding-top: clamp(8rem, 18vh, 12rem); padding-bottom: clamp(2rem, 6vh, 4rem); justify-content: flex-start; }
    .hero--page .hero-headline { font-size: clamp(2.8rem, 9vw, 8.4rem); }
    .hero--page .hero-kicker { font-size: clamp(1.4rem, 3.4vw, 3.2rem); max-width: 26ch; }
    .meta-row { display: flex; flex-wrap: wrap; gap: 0.5rem 2rem; margin-top: var(--space-8); font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); }
    .meta-row b { color: #fff; font-weight: 400; }
    .page-frame { aspect-ratio: 2.39 / 1; margin-top: clamp(2rem, 5vh, 3rem); opacity: 0; animation: fade 1.4s 0.25s var(--ease) forwards; }
    @media (max-width: 680px) { .page-frame { aspect-ratio: 4 / 3; } }

    /* old way / new way */
    .versus { display: grid; grid-template-columns: 1fr 1fr; margin-top: clamp(2rem, 5vh, 3.5rem); border-top: 1px solid var(--line-strong); }
    .versus > div { padding: 1.8rem 2rem 2rem 0; }
    .versus > div + div { padding-left: 2rem; border-left: 1px solid var(--line-strong); }
    .versus .lbl { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); }
    .versus .lbl.w { color: #fff; }
    .versus ul { list-style: none; margin: 1.2rem 0 0; padding: 0; }
    .versus li { padding: 0.7rem 0; border-bottom: 1px solid var(--line); line-height: 1.55; color: var(--muted); }
    .versus > div + div li { color: #fff; }
    @media (max-width: 760px) { .versus { grid-template-columns: 1fr; } .versus > div + div { padding-left: 0; border-left: 0; border-top: 1px solid var(--line-strong); } }

    /* who decides / what we do */
    .roles { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 5rem); margin-top: clamp(2rem, 5vh, 3.5rem); }
    .roles h3 { margin-bottom: 1rem; }
    .roles ul { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line-strong); }
    .roles li { display: grid; grid-template-columns: 9.5rem 1fr; gap: 1rem; padding: 0.95rem 0; border-bottom: 1px solid var(--line); line-height: 1.55; color: var(--muted); }
    .roles li b { font-family: var(--mono); font-weight: 400; font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: #fff; padding-top: 0.2rem; }
    .roles .we li b { color: var(--dim); }
    @media (max-width: 860px) { .roles { grid-template-columns: 1fr; } .roles li { grid-template-columns: 1fr; gap: 0.25rem; } }

    /* next */
    .next { display: block; margin-top: clamp(2rem, 5vh, 3rem); padding: clamp(1.6rem, 4vw, 3rem) 0; border-top: 1px solid var(--line-strong); border-bottom: 1px solid var(--line-strong); text-decoration: none; }
    .next .lbl { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); }
    .next .t { display: block; margin-top: 0.6rem; font-size: clamp(1.8rem, 6vw, 5.2rem); line-height: 1; letter-spacing: -0.02em; text-transform: uppercase; font-weight: 530; transition: transform 0.4s var(--ease); }
    .next:hover .t { transform: translateX(0.6rem); }
    .next .d { display: block; margin-top: 0.8rem; color: var(--muted); max-width: 60ch; line-height: 1.55; }

    /* walkthrough bar */
    .walk {
      position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
      display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1rem;
      padding: 0.7rem clamp(1rem, 4.8vw, 5rem);
      background: rgba(0, 0, 0, 0.86); border-top: 1px solid var(--line-strong);
      -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
      font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
    }
    .walk a { color: #fff; text-decoration: none; padding: 0.45rem 0.7rem; border: 1px solid var(--line-strong); white-space: nowrap; transition: all 200ms ease; }
    .walk a:hover { border-color: #fff; }
    .walk a.off { visibility: hidden; }
    .walk .mid { display: flex; align-items: center; gap: 1rem; min-width: 0; }
    .walk .where { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--dim); }
    .walk .where b { color: #fff; font-weight: 400; }
    .ticks { display: flex; gap: 3px; flex: 1; min-width: 60px; }
    .ticks a { flex: 1; height: 3px; padding: 0; border: 0; background: var(--line-strong); }
    .ticks a.done { background: rgba(255,255,255,.55); }
    .ticks a.now { background: #fff; }
    .ticks a.gap { margin-left: 8px; }
    @media (max-width: 680px) { .walk .where { display: none; } .walk a .long { display: none; } }

    /* hub map */
    .map { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: clamp(2rem, 5vh, 3.5rem); border-top: 1px solid #fff; }
    .map > section { padding: 1.6rem 1.6rem 2rem 0; }
    .map > section + section { padding-left: 1.6rem; border-left: 1px solid var(--line-strong); }
    .map .ph { display: flex; justify-content: space-between; align-items: baseline; }
    .map .ph h3 { font-size: clamp(1.6rem, 3vw, 2.6rem); }
    .map .ph span { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); }
    .map .ph-d { color: var(--muted); line-height: 1.55; margin: 0.8rem 0 1.2rem; min-height: 4.6em; }
    .map ol { list-style: none; margin: 0; padding: 0; }
    .map li a { display: grid; grid-template-columns: 2.2rem 1fr; padding: 0.85rem 0; border-top: 1px solid var(--line); text-decoration: none; transition: padding 0.3s var(--ease); }
    .map li a:hover { padding-left: 0.4rem; }
    .map li i { font-style: normal; font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; color: var(--dim); padding-top: 0.25rem; }
    .map li b { font-weight: 530; text-transform: uppercase; letter-spacing: 0.005em; }
    .map li small { grid-column: 2; display: block; color: var(--muted); font-size: 0.9rem; line-height: 1.45; margin-top: 0.2rem; }
    @media (max-width: 960px) { .map { grid-template-columns: 1fr; } .map > section + section { padding-left: 0; border-left: 0; border-top: 1px solid var(--line-strong); } .map .ph-d { min-height: 0; } }

    .start { display: inline-block; margin-top: var(--space-8); padding: 0.85rem 1.2rem; background: #fff; color: #000; font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.09em; text-transform: uppercase; text-decoration: none; border: 1px solid #fff; transition: all 200ms ease; }
    .start:hover { background: #000; color: #fff; }

    /* weeks (design workshop) */
    .weeks { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: clamp(2rem, 5vh, 3.5rem); border-top: 1px solid #fff; }
    .weeks > div { padding: 1.5rem 1.6rem 1.8rem 0; }
    .weeks > div + div { padding-left: 1.6rem; border-left: 1px solid var(--line-strong); }
    .weeks .when { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); }
    .weeks h3 { margin: 0.6rem 0 0.8rem; font-size: clamp(1.4rem, 2.4vw, 2.1rem); }
    .weeks p { color: var(--muted); line-height: 1.6; margin: 0 0 1rem; }
    .weeks ul { list-style: none; margin: 0; padding: 0; }
    .weeks li { padding: 0.55rem 0; border-top: 1px solid var(--line); line-height: 1.5; }
    .weeks li a { text-decoration: none; border-bottom: 1px solid var(--line-strong); }
    @media (max-width: 900px) { .weeks { grid-template-columns: 1fr; } .weeks > div + div { padding-left: 0; border-left: 0; border-top: 1px solid var(--line-strong); } }

    .deliver { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: 0.75rem; margin-top: clamp(2rem, 5vh, 3rem); }
    .deliver div { border: 1px solid var(--line-strong); padding: 1.1rem 1.1rem 1.3rem; }
    .deliver b { display: block; font-weight: 530; text-transform: uppercase; margin-bottom: 0.4rem; }
    .deliver span { color: var(--muted); line-height: 1.5; font-size: 0.95rem; }

    /* generic interactive bits used by demos */
    .panel-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line-strong); }
    .panel-list li { display: grid; grid-template-columns: 1fr auto; gap: 1rem; align-items: center; padding: 0.7rem 0; border-bottom: 1px solid var(--line); color: var(--muted); line-height: 1.45; }
    .panel-list li b { color: #fff; font-weight: 530; }
    .swatches { display: flex; gap: 0.35rem; flex-wrap: wrap; }
    .swatches i { width: 1.4rem; height: 1.4rem; border: 1px solid var(--line-strong); display: inline-block; }
    .stamp { display: inline-block; margin-top: 1rem; padding: 0.35rem 0.6rem; border: 1px solid #fff; font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; }
    .stamp.hidden { display: none; }
    .tbl { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
    .tbl th { text-align: left; font-family: var(--mono); font-weight: 400; font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim); padding: 0.6rem 0.6rem 0.6rem 0; border-bottom: 1px solid var(--line-strong); }
    .tbl td { padding: 0.7rem 0.6rem 0.7rem 0; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--muted); line-height: 1.45; }
    .tbl td b { color: #fff; font-weight: 530; }
    .scroll-x { overflow-x: auto; }
    .note { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim); margin-top: 0.8rem; }
    .demo--split { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); }
    .demo--poster { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); align-items: start; }
    .demo--ledger { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); align-items: start; }
    .sticky-col { position: sticky; top: 6rem; }
    @media (max-width: 1000px) {
      .demo--split, .demo--poster, .demo--ledger { grid-template-columns: 1fr; }
      .sticky-col { position: static; }
    }
    @media (max-width: 760px) {
      .mm-t tr, .mm-t td, .mm-t th { display: block; }
      .mm-t tr:first-child { display: none; }
      .mm-t td { border-bottom: 0; padding-bottom: 0.3rem; }
      .mm-t tr { border-bottom: 1px solid var(--line); padding: 0.6rem 0 0.8rem; }
      .mm-t .m { flex-wrap: wrap; }
    }

    /* ════════ timeline: the new way next to the old way ════════ */
    .tline { --s: 1; display: grid; grid-template-columns: 1fr 1fr; gap: clamp(0.6rem, 2.4vw, 2.4rem); margin-top: clamp(2rem, 5vh, 3.5rem); align-items: start; }
    .tl-col { display: flex; flex-direction: column; gap: 0.45rem; }
    .tl-col.old { padding-left: clamp(0.6rem, 2.4vw, 2.4rem); border-left: 1px solid var(--line-strong); }
    .tl-h { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; padding-bottom: 0.9rem; margin-bottom: 0.4rem; border-bottom: 1px solid #fff; }
    .tl-col.old .tl-h { border-color: var(--line-strong); }
    .tl-h h3 { font-size: clamp(1.1rem, 2.6vw, 2.2rem); }
    .tl-col.old .tl-h h3 { color: var(--muted); }
    .tl-h span { font-family: var(--mono); font-size: clamp(0.72rem, 1.2vw, 0.95rem); letter-spacing: 0.1em; text-transform: uppercase; white-space: nowrap; }
    .tl-col.old .tl-h span { color: var(--muted); }
    .tl-card {
      position: relative; box-sizing: border-box;
      height: calc(var(--h) * var(--s) * 1px); min-height: 4.4rem;
      display: flex; justify-content: space-between; align-items: flex-start; gap: 0.8rem;
      padding: 0.85rem 1rem; line-height: 1.35;
      border: 1px solid var(--line-strong); background: rgba(255, 255, 255, 0.03); color: var(--muted);
      transform-origin: top; opacity: 0; transform: scaleY(0.6);
      transition: opacity 0.6s var(--ease), transform 0.8s var(--ease);
      transition-delay: calc(var(--d) + 200ms);
    }
    .tl-col.new .tl-card { border-color: #fff; background: rgba(255, 255, 255, 0.09); color: #fff; }
    .tl-card.wait { background: repeating-linear-gradient(135deg, rgba(255,255,255,.14) 0 1px, transparent 1px 9px); border-style: dashed; }
    .tl-l { font-size: clamp(0.82rem, 1.25vw, 1.05rem); max-width: 22ch; }
    .tl-t { font-family: var(--mono); font-size: clamp(0.62rem, 0.95vw, 0.76rem); letter-spacing: 0.08em; text-transform: uppercase; white-space: nowrap; }
    .tl-back {
      box-sizing: border-box; height: calc(var(--h) * var(--s) * 1px); min-height: 5rem;
      display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 0.5rem; text-align: center; padding: 1rem;
      border: 1px dashed rgba(255, 255, 255, 0.5); color: var(--muted);
      font-family: var(--mono); font-size: clamp(0.62rem, 0.95vw, 0.74rem); letter-spacing: 0.12em; text-transform: uppercase;
      opacity: 0; transition: opacity 0.9s var(--ease); transition-delay: calc(var(--d) + 500ms);
    }
    .tl-back b { font-family: var(--display); font-size: clamp(1.4rem, 3.4vw, 3rem); font-weight: 530; letter-spacing: -0.02em; color: #fff; text-transform: none; }
    .tline.is-visible .tl-card { opacity: 1; transform: none; }
    .tline.is-visible .tl-back { opacity: 1; }
    @media (prefers-reduced-motion: reduce) { .tl-card, .tl-back { opacity: 1; transform: none; transition: none; } }
    @media (max-width: 760px) {
      .tline { --s: 0.72; }
      .tl-card { flex-direction: column; justify-content: flex-start; gap: 0.3rem; padding: 0.6rem 0.65rem; min-height: 4.8rem; }
      .tl-l { font-size: 0.8rem; }
      .tl-h { flex-direction: column; gap: 0.2rem; }
      .tl-t { white-space: normal; }
    }

    /* ════════ sign-in ════════ */
    .gate-body { padding-bottom: 0; }
    .gate { min-height: 100vh; min-height: 100svh; display: flex; flex-direction: column; justify-content: center; width: min(28rem, 100%); margin: 0 auto; padding: 2rem clamp(1rem, 5vw, 1.5rem); }
    .gate-mark { font-size: clamp(3rem, 12vw, 5rem); margin-bottom: 1.6rem; }
    .gate label { display: block; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); margin-bottom: 0.5rem; }
    .gate input { width: 100%; background: transparent; border: 0; border-bottom: 1px solid var(--line-strong); color: #fff; font: inherit; font-size: 1.3rem; padding: 0.6rem 0; outline: none; }
    .gate input:focus { border-color: #fff; }
    .gate .start { margin-top: 1.6rem; cursor: pointer; }
    .gate-msg { min-height: 1.5em; margin-top: 1rem; color: var(--muted); }

    /* ════════ presenter mode ════════ */
    .presenter {
      position: fixed; right: clamp(0.6rem, 2vw, 1.5rem); bottom: 4.6rem; z-index: 30;
      width: min(24rem, calc(100vw - 1.2rem)); max-height: calc(100vh - 8rem); overflow-y: auto;
      background: #fff; color: #111; padding: 1.1rem 1.2rem 1.2rem; box-shadow: 0 10px 40px rgba(0,0,0,.6);
    }
    .presenter[hidden] { display: none; }
    .pr-top { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(17,17,17,.55); padding-bottom: 0.7rem; border-bottom: 1px solid rgba(17,17,17,.15); }
    .pr-timer { color: #111; }
    .presenter ol { margin: 0.8rem 0 0; padding-left: 1.2rem; line-height: 1.45; font-size: 0.95rem; }
    .presenter li { margin-bottom: 0.5rem; }
    .pr-q { margin: 1rem 0 0.2rem; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(17,17,17,.55); }
    .pr-ask { margin: 0; font-weight: 530; line-height: 1.35; }
    .pr-a { margin: 0.4rem 0 0; line-height: 1.45; color: rgba(17,17,17,.8); font-size: 0.95rem; }
    .pr-btn { font-family: var(--mono); font-size: 0.7rem; width: 1.9rem; height: 1.9rem; flex: none; border: 1px solid var(--line-strong); background: transparent; color: #fff; cursor: pointer; }
    .pr-btn:hover, .pr-btn.on { background: #fff; color: #000; border-color: #fff; }

    /* ════════ workshop request ════════ */
    .book-form { margin-top: clamp(2rem, 5vh, 3rem); max-width: 60rem; }
    .bf-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem 2rem; }
    .book-form label { display: flex; flex-direction: column; gap: 0.5rem; font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); }
    .book-form input, .book-form select, .book-form textarea { font-family: var(--display); font-size: 1.05rem; letter-spacing: 0; text-transform: none; color: #fff; background: transparent; border: 0; border-bottom: 1px solid var(--line-strong); padding: 0.5rem 0; outline: none; border-radius: 0; }
    .book-form select option { background: #000; }
    .book-form textarea { border: 1px solid var(--line-strong); padding: 0.7rem; resize: vertical; }
    .book-form input:focus, .book-form select:focus, .book-form textarea:focus { border-color: #fff; }
    .bf-wide { margin-top: 1.4rem; }
    .bf-row { display: flex; align-items: center; gap: 1.2rem; flex-wrap: wrap; margin-top: 0.4rem; }
    .bf-row .start { cursor: pointer; }
    @media (max-width: 680px) { .bf-grid { grid-template-columns: 1fr; } }