/* Post-AI Data Stack · Welch-style: black, thin white strokes, mono labels,
   one accent for "inside the boundary". Stage is a fixed 1920×1080 canvas. */
:root {
  --bg: #000;
  --fg: #fff;
  --dim: #d6d6d6;    /* secondary text: ~84% white, readable from the back */
  --faint: #a3a3a3;  /* tertiary: labels, credits, dim strokes */
  --hair: rgba(255, 255, 255, 0.3);
  --accent: #f5c542;
  --accent-dim: rgba(245, 197, 66, 0.35);
  --good: #7ee0a1;
  --bad: #ff6b5f;
  --sans: "Helvetica Neue", Helvetica, Inter, Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, "JetBrains Mono", monospace;
  --stroke: 2px;
  --pad-x: 120px;
  --pad-y: 96px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--fg); overflow: hidden; }
body { font-family: var(--sans); -webkit-font-smoothing: antialiased; }
body.idle { cursor: none; }
html, body { touch-action: manipulation; overscroll-behavior: none; } /* no double-tap zoom or pull-to-refresh */
#hint { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 45; padding: 10px 18px; border-radius: 999px;
        background: rgba(0, 0, 0, 0.8); border: 1px solid var(--faint); color: var(--fg); font: 15px/1.3 var(--mono);
        width: max-content; max-width: calc(100vw - 32px); white-space: normal; text-align: center; transition: opacity 0.6s; pointer-events: none; }
#hint.gone { opacity: 0; }

#field { position: fixed; inset: 0; z-index: 0; }
#stage, #chrome { position: fixed; /* fixed: a 1920px absolute box widens the mobile layout viewport and pushes the stage off-screen */ left: 0; top: 0; width: 1920px; height: 1080px; transform-origin: 0 0; }
#stage { z-index: 1; }
#chrome { z-index: 2; pointer-events: none; }
#black { position: fixed; inset: 0; background: #000; z-index: 50; opacity: 0; pointer-events: none; transition: opacity 0.4s; }
#black.on { opacity: 1; }

/* ---- slides --------------------------------------------------------------- */
.slide {
  position: absolute; inset: 0; padding: var(--pad-y) var(--pad-x);
  opacity: 0; visibility: hidden; transition: opacity 0.6s var(--ease), visibility 0s 0.6s;
  font-size: 36px; line-height: 1.35;
}
.slide.active { opacity: 1; visibility: visible; transition: opacity 0.6s var(--ease), visibility 0s; }
.slide.center { display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; }
.slide.middle { display: flex; flex-direction: column; justify-content: center; }
.slide.bleed { padding: 0; }

/* ---- type ----------------------------------------------------------------- */
.t-hero  { font-size: 168px; font-weight: 500; line-height: 1; letter-spacing: -0.03em; margin: 0; }
.t-title { font-size: 88px; font-weight: 500; line-height: 1.05; letter-spacing: -0.02em; margin: 0 0 40px; }
.t-sub   { font-size: 48px; font-weight: 400; line-height: 1.2; margin: 0 0 28px; color: var(--dim); }
.t-body  { font-size: 36px; line-height: 1.4; }
.t-small { font-size: 28px; line-height: 1.4; }
.t-label { font-family: var(--mono); font-size: 22px; letter-spacing: 0.28em; text-transform: uppercase; color: var(--dim); }
.mono { font-family: var(--mono); }
.dim { color: var(--dim); }
.faint { color: var(--faint); }
.accent { color: var(--accent); }
.good { color: var(--good); }
.bad { color: var(--bad); }
.quote { font-size: 56px; line-height: 1.25; font-weight: 400; max-width: 1500px; }
.quote::before { content: "“"; } .quote::after { content: "”"; }
.cite { font-family: var(--mono); font-size: 22px; color: var(--dim); letter-spacing: 0.06em; }
.cite.foot { position: absolute; left: var(--pad-x); bottom: 110px; }
strong { font-weight: 600; }
em { font-style: normal; color: var(--accent); }

/* ---- layout helpers ------------------------------------------------------- */
.stack > * + * { margin-top: var(--gap, 28px); }
.row { display: flex; gap: var(--gap, 48px); align-items: center; }
.cols { display: grid; grid-template-columns: repeat(var(--n, 2), 1fr); gap: var(--gap, 64px); }
.grow { flex: 1; }

.bullets { list-style: none; padding: 0; margin: 0; }
.bullets li { position: relative; padding-left: 56px; margin: 0 0 26px; }
.bullets li::before { content: ""; position: absolute; left: 0; top: 0.68em; width: 28px; height: var(--stroke); background: var(--faint); }
.bullets li .mark { position: absolute; left: 0; top: 0; width: 40px; font-family: var(--mono); }
.bullets li:has(.mark)::before { display: none; }

.box { border: var(--stroke) solid var(--faint); border-radius: 18px; padding: 28px 36px; }
.box.accent { border-color: var(--accent); }
.chip { display: inline-block; font-family: var(--mono); font-size: 22px; letter-spacing: 0.12em; text-transform: uppercase;
        border: var(--stroke) solid var(--faint); border-radius: 999px; padding: 6px 18px; color: var(--dim); }

.frame { border: var(--stroke) solid var(--hair); border-radius: 14px; overflow: hidden; background: #000; }
.frame img, .frame video { display: block; width: 100%; height: 100%; object-fit: contain; }
img.fit { max-width: 100%; max-height: 100%; object-fit: contain; display: block; }

pre, code { font-family: var(--mono); }
pre.code { font-size: 24px; line-height: 1.45; margin: 0; padding: 24px 28px; border: var(--stroke) solid var(--hair); border-radius: 14px; white-space: pre; overflow: hidden; }

/* ---- SVG primitives (use pathLength="1" with .draw) ----------------------- */
svg { overflow: visible; }
svg .ln     { fill: none; stroke: var(--fg); stroke-width: 2; }
svg .ln-dim { fill: none; stroke: var(--faint); stroke-width: 2; }
svg .ln-hair{ fill: none; stroke: var(--hair); stroke-width: 1.5; }
svg .ln-acc { fill: none; stroke: var(--accent); stroke-width: 2.5; }
svg .fill-acc { fill: var(--accent); }
svg .fill-fg  { fill: var(--fg); }
svg .lbl { font-family: var(--mono); font-size: 22px; letter-spacing: 0.2em; fill: var(--dim); text-transform: uppercase; }
svg .txt { font-family: var(--sans); font-size: 32px; fill: var(--fg); }
svg .draw { stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset 1.4s var(--ease); }
.slide.active svg .draw:not([data-step]), svg .draw.shown { stroke-dashoffset: 0; }

/* ---- build steps ---------------------------------------------------------- */
[data-step], [data-step-only] { opacity: 0; transform: translateY(14px); transition: opacity 0.5s var(--ease), transform 0.5s var(--ease); }
[data-step].shown, [data-step-only].shown { opacity: 1; transform: none; }
svg [data-step], svg [data-step-only] { transform: none; }
[data-step-hide] { transition: opacity 0.4s var(--ease); }
[data-step-hide].gone { opacity: 0; }
/* .dim-after: earlier items fade back once later steps appear (use on lists) */
.focus-last > .shown:not(:last-child):has(~ .shown) { opacity: 0.6; }

/* ---- chrome --------------------------------------------------------------- */
#label { position: absolute; left: var(--pad-x); bottom: 44px; font-family: var(--mono); font-size: 20px;
         letter-spacing: 0.3em; text-transform: uppercase; color: var(--faint); }
#progress { position: absolute; left: 0; bottom: 0; height: 3px; background: var(--hair); transition: width 0.6s var(--ease); }
#counter { position: absolute; right: 72px; bottom: 44px; min-width: 340px; padding: 18px 28px 20px;
           border: var(--stroke) solid var(--faint); border-radius: 16px; background: rgba(0, 0, 0, 0.72);
           opacity: 0; transform: translateY(10px); transition: opacity 0.5s var(--ease), transform 0.5s var(--ease); }
#counter.on { opacity: 1; transform: none; }
#counter .k { font-family: var(--mono); font-size: 18px; letter-spacing: 0.28em; text-transform: uppercase; color: var(--dim); }
#counter .value { display: block; margin-top: 6px; font-size: 40px; font-weight: 500; }
#counter.flash { animation: counter-flash 1.2s var(--ease); }
@keyframes counter-flash { 0% { border-color: var(--accent); box-shadow: 0 0 0 6px var(--accent-dim); } 100% { border-color: var(--faint); box-shadow: 0 0 0 0 transparent; } }

#notes { position: fixed; left: 0; right: 0; bottom: 0; max-height: 42vh; overflow: auto; z-index: 40; display: none;
         background: rgba(12, 12, 12, 0.94); border-top: 1px solid #333; padding: 18px 28px; font-size: 18px; line-height: 1.5; }
#notes.on { display: block; }
#notes .meta { font-family: var(--mono); color: #999; margin-bottom: 8px; }
#notes p { margin: 0 0 0.6em; max-width: 90ch; }

/* ---- screenshot mode: no transitions, final states ------------------------ */
.shot *, .shot *::before, .shot *::after { transition: none !important; animation-duration: 0s !important; animation-delay: 0s !important; }