/* ═══════════════════════════════════════
   ECHO — proof.css  ("Proof at every distance", homepage #work)
   Three stages, far (left) → close (right), each a framed vignette with
   its result. (The distance axis from the original mockup was removed.)
   Mockup tokens are mapped onto the site's (base.css / index.css); only
   values the site lacks are new (--pf-muted, --pf-halo, sizes).
   Hidden start states live under html.js only, so no-JS shows everything.
   JS: JS/proof.js (vanilla).
   ═══════════════════════════════════════ */

.pf {
  --pf-ink: var(--text);
  --pf-ink-soft: var(--text-muted);
  --pf-muted: #7d75a0;                     /* new: quieter label ink */
  --pf-line: var(--border);
  --pf-surface: var(--surface-2);
  --pf-accent: var(--accent);
  --pf-halo: rgba(91, 43, 224, 0.14);      /* new: node / marker halo */
  --pf-t-label: 0.6875rem;
  --pf-t-h2: clamp(2.6rem, 1.6rem + 3.4vw, 4.5rem);
  --pf-t-quote: clamp(1.2rem, 1rem + 0.6vw, 1.55rem);
  --pf-ease-out: var(--ease-out, cubic-bezier(0.16, 1, 0.3, 1));
  --pf-ease-inout: var(--ease-inout, cubic-bezier(0.65, 0, 0.35, 1));
  --pf-dur-fast: var(--dur-fast, 0.35s);
  --pf-dur-med: var(--dur-med, 0.7s);
  position: relative;
  z-index: 1;
  color: var(--pf-ink);
}

.pf-label {
  font-family: 'DM Mono', monospace;
  font-size: var(--pf-t-label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--pf-muted);
  margin: 0;
}
.pf-label--accent { color: var(--pf-accent); }
.pf-mask { display: block; overflow: hidden; padding-bottom: 0.1em; margin-bottom: -0.1em; }
.pf-mask > span { display: inline-block; }

/* ── Header ── */
.pf-head { display: grid; gap: 1.5rem; align-items: end; margin-bottom: 4rem; }
@media (min-width: 900px) { .pf-head { grid-template-columns: 1.3fr 1fr; gap: 6rem; } }
.pf-title {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: var(--pf-t-h2);
  line-height: 0.98;
  letter-spacing: -0.015em;
  margin: 1rem 0 0;
  text-wrap: balance;
}
.pf-title em { color: var(--pf-accent); }
.pf-lead { color: var(--pf-ink-soft); max-width: 44ch; margin: 0; line-height: 1.6; }

/* ── Track ── */
.pf-scroller { position: relative; }
.pf-track {
  position: relative;
  display: grid;
  /* first/last stages sit flush to the edges, so they get 2rem less width:
     all three frames end up the same size */
  grid-template-columns: calc((100% - 8rem) / 3 + 2rem) calc((100% - 8rem) / 3 + 4rem) calc((100% - 8rem) / 3 + 2rem);
  row-gap: 1.5rem;
}
/* ── Stage: subgrid keeps meta / frame / headline / metric aligned across columns ── */
.pf-stage {
  position: relative;
  display: grid;
  grid-row: span 4;
  grid-template-rows: subgrid;
  align-content: start;
  row-gap: 1.5rem;
  padding: 0.5rem 2rem 1rem;
  min-width: 0;
}
.pf-stage--first ~ .pf-stage::before {   /* column divider, soft at the top */
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--pf-line) 3rem);
}
.pf-stage--first { padding-left: 0; }
.pf-stage:last-child { padding-right: 0; }
.pf-stage:hover .pf-idx,
.pf-stage:focus-within .pf-idx { letter-spacing: 0.18em; }
.pf-idx { transition: letter-spacing var(--pf-dur-med) var(--pf-ease-out); }

.pf-mask > .pf-meta { width: 100%; min-height: 24px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.pf-idx {
  font-family: 'DM Mono', monospace;
  font-size: var(--pf-t-label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--pf-accent);
}
.pf-tag {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border: 1px solid var(--pf-line);
  border-radius: 999px;
  padding: 3px 10px;
  color: var(--pf-ink-soft);
}

.pf-tag--link { text-decoration: none; transition: border-color 0.25s ease, color 0.25s ease, background-color 0.25s ease; }
.pf-tag--link span { display: inline-block; transition: transform 0.25s ease; }
.pf-tag--link:hover,
.pf-tag--link:focus-visible { border-color: var(--pf-accent); color: var(--pf-accent); background: rgba(91, 43, 224, 0.06); }
.pf-tag--link:hover span { transform: translateX(2px); }

/* media frame: work first, number second */
.pf-media {
  position: relative;
  aspect-ratio: 16 / 10;
  max-width: 100%;
  border: 1px solid var(--pf-line);
  border-radius: 6px;
  background: var(--pf-surface);
  display: grid;
  place-items: center;
  overflow: hidden;
  transition: border-color var(--pf-dur-med) var(--pf-ease-out);
}
.pf-media { transition: border-color var(--pf-dur-med) var(--pf-ease-out), transform var(--pf-dur-med) var(--pf-ease-out), box-shadow var(--pf-dur-med) var(--pf-ease-out); }
.pf-stage:hover .pf-media,
.pf-stage:focus-within .pf-media { border-color: var(--pf-accent); transform: translateY(-3px); box-shadow: 0 18px 40px -24px rgba(91, 43, 224, 0.45); }
.pf-headline {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(1.35rem, 1.05rem + 0.8vw, 1.75rem);
  line-height: 1.2;
  letter-spacing: -0.005em;
  margin: 0;
  text-wrap: balance;
  max-width: 22ch;
  color: var(--pf-ink);
}
.pf-metric { margin: 0; padding-top: 1rem; border-top: 1px solid var(--pf-line); }
.pf-metric > span {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  font-family: 'DM Mono', monospace;
  font-size: var(--pf-t-label);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--pf-ink-soft);
  font-variant-numeric: tabular-nums;
}
.pf-metric b { font-weight: 500; color: var(--pf-accent); }
.pf-metric i { font-style: normal; color: var(--pf-accent); }

/* ── Vignettes (animated SVG, pure CSS) — one small scene per stage ── */
.pf-media {
  background:
    radial-gradient(ellipse 70% 60% at 50% 45%, rgba(255, 255, 255, 0.75), transparent 70%),
    radial-gradient(rgba(91, 43, 224, 0.13) 1px, transparent 1.3px) 0 0 / 14px 14px,
    var(--pf-surface);
}
.pf-vig {
  width: 90%;
  height: auto;
  overflow: visible;
  color: var(--pf-accent);
  opacity: 0.9;
  transition: opacity var(--pf-dur-med) var(--pf-ease-out);
}
.pf-stage:hover .pf-vig,
.pf-media:hover .pf-vig { opacity: 1; }
.pf-vig * { fill: none; stroke: currentColor; stroke-width: 1.25; stroke-linecap: round; stroke-linejoin: round; vector-effect: non-scaling-stroke; }
.pf-vig .mute { stroke: var(--pf-muted); stroke-opacity: 0.7; }
.pf-vig .solid { fill: currentColor; stroke: none; }
.pf-vig .soft { fill: var(--pf-halo); }
.pf-vig .panel { fill: #fff; }
.pf-vig .shade { fill: rgba(91, 43, 224, 0.1); stroke: none; }
.pf-vig .mute-fill { fill: var(--pf-muted); fill-opacity: 0.45; stroke: none; }
.pf-vig .track { fill: rgba(125, 117, 160, 0.25); stroke: none; }
.pf-vig .hill1 { fill: rgba(91, 43, 224, 0.16); stroke: none; }
.pf-vig .hill2 { fill: rgba(91, 43, 224, 0.3); stroke: none; }
.pf-vig .ribbon { fill: var(--pf-halo); }
.pf-vig .hitbg { fill: rgba(91, 43, 224, 0.06); stroke: rgba(91, 43, 224, 0.35); }
.pf-vig .title { stroke-width: 2.4; }
.pf-vig .v-cover { fill: #fff; stroke: none; }
.pf-vig text { stroke: none; }
.pf-vig .t { font-family: 'DM Mono', monospace; font-size: 5.6px; letter-spacing: 0.08em; fill: var(--pf-muted); }
.pf-vig .t-acc { fill: var(--pf-accent); }
.pf-vig .t-inv { fill: #fff; font-size: 4.3px; letter-spacing: 0.14em; }
.pf-vig .t-ink { fill: var(--pf-ink); letter-spacing: 0.02em; font-size: 5.8px; }
.pf-vig .t-b { fill: var(--pf-ink); font-weight: 500; font-size: 4.8px; letter-spacing: 0.14em; }
.pf-vig .t-num { font-family: var(--font-head); font-size: 18px; fill: var(--pf-accent); }
.pf-vig .v-draw { stroke-width: 1.6; vector-effect: none; stroke-dasharray: 80; stroke-dashoffset: 0; }
.pf-vig [class*="v-"] { transform-box: fill-box; transform-origin: center; }

/* 01 · TV: the spot plays, the signal broadcasts, two awards land */
.pf-vig .v-prog { transform-origin: left center; animation: pfProg 6s linear infinite; }
@keyframes pfProg { 0% { transform: scaleX(0); } 90% { transform: scaleX(1); } 100% { transform: scaleX(1); opacity: 0; } }
.pf-vig .v-ring { animation: pfRing 2s var(--pf-ease-out) infinite; }
@keyframes pfRing { 0% { transform: scale(1); opacity: 0.7; } 100% { transform: scale(1.9); opacity: 0; } }
.pf-vig .v-sun { animation: pfSun 6s ease-in-out infinite; }
@keyframes pfSun { 50% { transform: translateY(3px); } }
.pf-vig .v-wave { opacity: 0; animation: pfWave 2.4s var(--pf-ease-out) infinite; transform-origin: left center; }
.pf-vig .v-wave.w2 { animation-delay: 0.3s; }
.pf-vig .v-wave.w3 { animation-delay: 0.6s; }
@keyframes pfWave { 0% { opacity: 0; transform: scale(0.7); } 30% { opacity: 1; } 70%, 100% { opacity: 0; transform: scale(1.08); } }
.pf-vig .v-award { opacity: 0; animation: pfAward 6s var(--pf-ease-out) infinite; }
.pf-vig .v-award.a2 { animation-delay: 0.35s; }
@keyframes pfAward { 0%, 25% { opacity: 0; transform: scale(0.4) translateY(6px); } 33% { opacity: 1; transform: scale(1.12); } 38%, 90% { opacity: 1; transform: scale(1); } 97%, 100% { opacity: 0; transform: scale(1); } }

/* 02 · Feed: tap "Learn more", the feed scrolls on, CTR bar climbs */
.pf-vig .v-feed { animation: pfFeed 5s var(--pf-ease-inout) infinite; }
@keyframes pfFeed { 0%, 38% { transform: translateY(0); } 58%, 100% { transform: translateY(-62px); } }
.pf-vig .v-tap { opacity: 0; animation: pfTap 5s var(--pf-ease-out) infinite; }
@keyframes pfTap { 0%, 16% { opacity: 0; transform: scale(0.4); } 20% { opacity: 1; transform: scale(0.6); } 34%, 100% { opacity: 0; transform: scale(2.6); } }
.pf-vig .v-finger { animation: pfFinger 5s var(--pf-ease-inout) infinite; }
@keyframes pfFinger { 0%, 6% { transform: translate(12px, 16px); opacity: 0; } 15% { opacity: 1; transform: translate(0, 0); } 20% { transform: scale(0.75); } 25% { transform: scale(1); } 36%, 100% { opacity: 0; transform: translate(12px, 16px); } }
.pf-vig .v-heart { opacity: 0; animation: pfHeart 5s ease-out infinite; }
.pf-vig .v-heart.h2 { animation-delay: 0.4s; }
.pf-vig .v-heart.h3 { animation-delay: 0.8s; }
@keyframes pfHeart { 0%, 22% { opacity: 0; transform: translateY(6px) scale(0.6); } 32% { opacity: 1; transform: translateY(0) scale(1); } 62%, 100% { opacity: 0; transform: translateY(-22px) scale(1.1); } }
.pf-vig .v-bar { transform-origin: center bottom; animation: pfBar 5s var(--pf-ease-out) infinite; }
@keyframes pfBar { 0%, 22% { transform: scaleY(0.22); } 44%, 92% { transform: scaleY(1); } 100% { transform: scaleY(0.22); } }
.pf-vig .v-lift { animation: pfLift 5s var(--pf-ease-out) infinite; }
@keyframes pfLift { 0%, 36% { opacity: 0; } 46%, 90% { opacity: 1; } 100% { opacity: 0; } }

/* 03 · Search: the query types, results land, the ad is clicked, ROAS draws */
.pf-vig .v-cover { animation: pfCover 6s steps(22, end) infinite; transform-origin: left center; }
@keyframes pfCover { 0% { transform: translateX(0); } 26%, 92% { transform: translateX(100px); } 100% { transform: translateX(0); } }
.pf-vig .v-res { opacity: 0; animation: pfRes 6s var(--pf-ease-out) infinite; }
.pf-vig .v-res.r2 { animation-delay: 0.12s; }
.pf-vig .v-res.r3 { animation-delay: 0.24s; }
@keyframes pfRes { 0%, 28% { opacity: 0; transform: translateY(4px); } 36%, 92% { opacity: 1; transform: translateY(0); } 98%, 100% { opacity: 0; } }
.pf-vig .v-hit { opacity: 0; animation: pfHit 6s var(--pf-ease-out) infinite; }
@keyframes pfHit { 0%, 30% { opacity: 0; } 38%, 92% { opacity: 1; } 98%, 100% { opacity: 0; } }
.pf-vig .v-cursor { opacity: 0; animation: pfCursor 6s var(--pf-ease-inout) infinite; }
@keyframes pfCursor { 0%, 40% { opacity: 0; transform: translate(20px, 24px); } 50% { opacity: 1; transform: translate(0, 0); } 55% { transform: scale(0.85); } 59% { transform: scale(1); } 88% { opacity: 1; } 95%, 100% { opacity: 0; } }
.pf-vig .v-click { opacity: 0; animation: pfClick 6s var(--pf-ease-out) infinite; }
@keyframes pfClick { 0%, 54% { opacity: 0; transform: scale(0.4); } 56% { opacity: 1; } 70%, 100% { opacity: 0; transform: scale(2.4); } }
.pf-vig .v-draw { animation: pfDraw 6s var(--pf-ease-out) infinite; }
@keyframes pfDraw { 0%, 58% { stroke-dashoffset: 80; } 80%, 94% { stroke-dashoffset: 0; } 100% { stroke-dashoffset: 80; } }
.pf-vig .v-dot { opacity: 0; animation: pfDot 6s var(--pf-ease-out) infinite; }
@keyframes pfDot { 0%, 78% { opacity: 0; transform: scale(0.3); } 84%, 94% { opacity: 1; transform: scale(1); } 100% { opacity: 0; } }

/* everything ambient rests while the section is off screen (proof.js) */
.pf.is-offscreen .pf-vig * { animation-play-state: paused; }

.pf-swipe { display: none; }
.pf-scroller:focus-visible { outline: 2px solid var(--pf-accent); outline-offset: 4px; border-radius: 4px; }

/* ── Phones and tablets: same horizontal track, native swipe ──
   The scroller bleeds to the screen edges (the page body never scrolls
   sideways); cards snap to the page gutter. */
@media (max-width: 899px) {
  /* must equal the .container side padding (base.css, mobile.css) */
  .pf { --pf-gutter: clamp(1.25rem, 5vw, 3rem); }
  .pf-head { margin-bottom: 3rem; }
  .pf-scroller {
    margin-inline: calc(-1 * var(--pf-gutter));
    padding-inline: var(--pf-gutter);
    scroll-padding-inline: var(--pf-gutter);
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .pf-scroller::-webkit-scrollbar { display: none; }
  .pf-track { grid-template-columns: min(76vw, 340px) calc(min(76vw, 340px) + 1.5rem) min(76vw, 340px); width: max-content; }
  .pf-stage { scroll-snap-align: start; padding-inline: 1.5rem; }
  .pf-stage--first { padding-left: 0; }
  .pf-stage:last-child { padding-right: 0; }
  .pf-swipe {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 1.5rem;
    transition: opacity var(--pf-dur-med) var(--pf-ease-out);
  }
  .pf.is-swiped .pf-swipe { opacity: 0; }
}
@media (max-width: 768px) { .pf { --pf-gutter: 1.25rem; } }
@media (max-width: 480px) { .pf { --pf-gutter: 1rem; } }

/* ── Start states (JS on, motion allowed). proof.js adds .is-head / .is-intro
   as it starts each reveal; the reveal animations hold their own start frame. ── */
@media (prefers-reduced-motion: no-preference) {
  html.js .pf:not(.is-head) .pf-head .pf-mask > span { transform: translateY(110%); }
  html.js .pf:not(.is-head) .pf-lead { opacity: 0; transform: translateY(20px); }
  html.js .pf:not(.is-intro) .pf-track .pf-mask > span { transform: translateY(110%); }
}

@media (prefers-reduced-motion: reduce) {
  .pf-vig * { animation: none !important; }
  .pf-vig .v-wave, .pf-vig .v-res, .pf-vig .v-hit, .pf-vig .v-award, .pf-vig .v-lift, .pf-vig .v-dot { opacity: 1; }
  .pf-vig .v-cover { transform: translateX(100px); }
  .pf-vig .v-tap, .pf-vig .v-click, .pf-vig .v-cursor, .pf-vig .v-finger, .pf-vig .v-heart { opacity: 0; }
  .pf-media { transition: none; }
}