/* Layout: black architectural canvas, 1152px frame; perspective-room opening, pixel dissolve into
   a pale capability stage, ruled proof strip, white closing band, black four-column footer. */
:root {
  --canvas: #020202;
  --panel: #0e0e0e;
  --fg: #ededed;
  --body: #a9a9a9;
  --muted: #909090;
  --caption: #606060;
  --rule: #202020;
  --edge: #343434;
  --coral: #f34e3f;
  --coral-hover: #e0443a;
  --announce: #410604;
  --announce-text: #ffcdc3;
  --light-ink: #111111;
  --light-body: #444444;
  --light-rule: #d4d4d4;
  --light-media: #f7f7f7;
  --inline-muted: #8a8a8a;
  --white: #ffffff;
  --hero-btn: #222222;
  --hero-edge: #3a3a3a;
  --hero-label: #dedede;

  --sans: "Inter", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --frame: 1152px;
  --pad: 48px;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 110px; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--fg);
  font: 400 16px/1.5 var(--sans);
  letter-spacing: 0.016em;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; }
a { color: inherit; }
p { margin: 0; }
h1, h2, h3, h4 { margin: 0; font-weight: 500; text-wrap: balance; }
:focus-visible { outline: 2px solid var(--coral); outline-offset: 3px; border-radius: 4px; }

.frame {
  max-width: var(--frame);
  margin: 0 auto;
  padding-left: max(var(--pad), env(safe-area-inset-left, 0px));
  padding-right: max(var(--pad), env(safe-area-inset-right, 0px));
}
.eyebrow { font: 400 14px/1.5 var(--mono); letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); }
.eyebrow.coral { color: var(--coral); }

/* ---------- Header ---------- */
.site-top { position: sticky; top: 0; z-index: 20; }
.announce { background: var(--announce); color: var(--announce-text); min-height: 40px; display: flex; align-items: center; justify-content: center; padding: 8px 16px; font-size: 14px; letter-spacing: 0.018em; text-align: center; }
.announce a { text-decoration: none; }
.announce a:hover { text-decoration: underline; text-underline-offset: 3px; }
.nav-bar { background: var(--canvas); border-bottom: 1px solid var(--rule); }
.nav-bar .inner { max-width: 1280px; margin: 0 auto; height: 63px; padding: 0 max(var(--pad), env(safe-area-inset-left, 0px)); display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 16px; }
.brand { justify-self: start; text-decoration: none; font-weight: 600; font-size: 18px; letter-spacing: -0.02em; white-space: nowrap; }
.brand q { font: 400 14px var(--mono); letter-spacing: 0; color: var(--coral); quotes: "\201C" "\201D"; margin-left: 2px; }
.nav { display: flex; gap: 28px; font-size: 14px; }
.nav a { text-decoration: none; color: var(--body); transition: color .2s; }
.nav a:hover { color: var(--fg); }
.header-action { justify-self: end; }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: 500 14px/1 var(--sans); letter-spacing: 0.018em; padding: 9px 13px; border-radius: 8px; border: 1px solid transparent; text-decoration: none; cursor: pointer; white-space: nowrap; transition: opacity .2s, background-color .2s, border-color .2s; }
.btn-coral { background: var(--coral); color: var(--white); }
.btn-coral:hover { background: var(--coral-hover); }
.btn-pale { background: var(--fg); color: var(--canvas); border-color: var(--fg); }
.btn-pale:hover { opacity: .9; }
.btn-dark { background: var(--rule); color: var(--fg); border-color: var(--edge); }
.btn-dark:hover { border-color: var(--muted); }
.btn-black { background: var(--canvas); color: var(--white); border-color: var(--canvas); }
.btn-black:hover { opacity: .88; }
.btn-outline-light { background: var(--white); color: var(--light-ink); border-color: var(--light-rule); }
.btn-outline-light:hover { border-color: #b0b0b0; }
.btn[aria-disabled="true"] { opacity: .45; cursor: default; pointer-events: none; }
.btn-mono { font: 600 13px/1.5 var(--mono); letter-spacing: 0.02em; background: var(--hero-btn); color: var(--hero-label); border: 1px solid var(--hero-edge); border-radius: 6px; padding: 6.4px 14.4px; text-decoration: none; display: inline-flex; gap: 8px; transition: background-color .2s; }
.btn-mono:hover { background: #2e2e2e; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------- Opening: perspective room ---------- */
.room { position: relative; overflow: hidden; border-bottom: 1px solid var(--rule); }
.room-art { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.room-art line, .room-art rect { stroke: rgba(237, 237, 237, 0.10); stroke-width: 1; fill: none; vector-effect: non-scaling-stroke; }
.room-art circle { fill: rgba(237, 237, 237, 0.18); }
.room-inner { position: relative; max-width: 900px; margin: 0 auto; padding: 88px max(var(--pad), env(safe-area-inset-left, 0px)) 96px; display: grid; justify-items: center; text-align: center; gap: 24px; }
.room h1 { font-size: clamp(2.5rem, 1.4rem + 3.6vw, 4rem); line-height: 1.1; letter-spacing: -0.031em; }
.room h1 .line { display: block; }
.hero-support { font-size: clamp(1rem, 2.25vw, 1.375rem); line-height: 1.32; letter-spacing: -0.01em; color: var(--muted); max-width: 640px; }
.room .btn-mono { margin-top: -4px; }

/* Board plate: the tangible pale object */
.plate { width: 100%; max-width: 576px; margin-top: 24px; background: var(--light-media); color: var(--light-ink); border-radius: 32px; padding: 26px 28px 24px; text-align: left; box-shadow: 0 30px 80px -40px rgba(243, 78, 63, 0.35); }
.plate-head { display: flex; justify-content: space-between; gap: 12px; font: 400 12px/1.4 var(--mono); color: var(--light-body); letter-spacing: 0.04em; text-transform: uppercase; padding-bottom: 14px; border-bottom: 1px solid var(--light-rule); }
.plate-cols, .plate-row { display: grid; grid-template-columns: 6.5rem repeat(4, minmax(0, 1fr)); align-items: center; }
.plate-cols { font: 400 11px/1.4 var(--mono); color: var(--inline-muted); letter-spacing: 0.03em; padding: 12px 0 6px; }
.plate-cols span { text-align: center; }
.plate-row { padding: 11px 0; border-top: 1px dashed var(--light-rule); }
.plate-row b { font-weight: 500; font-size: 15px; letter-spacing: 0; }
.plate-track { grid-column: 2 / -1; position: relative; height: 22px; }
.plate-track::before { content: ""; position: absolute; left: 12.5%; right: 12.5%; top: 50%; border-top: 1px solid var(--light-ink); opacity: .25; }
.plate-track i { position: absolute; top: 50%; width: 9px; height: 9px; margin: -4.5px 0 0 -4.5px; border: 1px solid var(--light-ink); background: var(--light-media); }
.plate-track .here { width: 14px; height: 14px; margin: -7px 0 0 -7px; background: var(--coral); border-color: var(--coral); }
.plate-foot { margin-top: 12px; font: 400 12px/1.4 var(--mono); color: var(--light-body); }

/* ---------- Trust strip ---------- */
.trust { border-bottom: 1px solid var(--rule); }
.trust .frame { padding-block: 48px; display: grid; justify-items: center; gap: 24px; text-align: center; }
.trust-caption { font: 300 14px/1.5 var(--mono); letter-spacing: 0.018em; color: var(--caption); }
.trust-facts { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px 48px; font: 400 15px/1.4 var(--mono); color: var(--body); }
.trust-facts b { color: var(--fg); font-weight: 500; }

/* ---------- Problem ---------- */
.problem .frame { padding-block: 96px 112px; display: grid; justify-items: center; text-align: center; gap: 20px; }
.problem h2 { font-size: clamp(1.85rem, 4vw, 2.6rem); line-height: 1.28; letter-spacing: -0.01em; max-width: 820px; }
.problem p { color: var(--body); max-width: 620px; }
.capsules { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 8px; }
.capsules span { font: 400 13px/1.2 var(--mono); color: var(--body); border: 1px dashed var(--edge); border-radius: 9999px; padding: 7px 14px; }

/* ---------- Pixel devices ---------- */
.pixels { display: block; width: 100%; }
.pixels rect { fill: #ededed; }
.dissolve { height: 130px; }
.band-pixels { height: 72px; }

/* ---------- Pale capability stage ---------- */
.stage { background: var(--fg); color: var(--light-ink); }
.stage .frame { padding-block: 72px 144px; display: grid; gap: 48px; }
.stage-head { display: grid; justify-items: center; text-align: center; gap: 20px; }
.stage-head h2 { font-size: clamp(3rem, 6vw, 4rem); line-height: 1; letter-spacing: -0.031em; }
.stage-head h2 span { display: block; }
.stage-head p { color: var(--light-body); max-width: 620px; font-size: 18px; }

.tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.tab { position: relative; text-align: left; display: flex; align-items: flex-start; gap: 10.4px; background: var(--white); color: var(--light-ink); border: 1px solid var(--light-rule); border-radius: 8px; padding: 12px 16px 14px; font: inherit; cursor: pointer; transition: border-color .2s, background-color .2s, color .2s; overflow: hidden; }
.tab:hover { border-color: #b0b0b0; }
.tab .num { flex: none; width: 24px; height: 24px; border: 1px solid currentColor; border-radius: 50%; display: grid; place-items: center; font: 400 11px var(--mono); margin-top: 1px; }
.tab b { display: block; font-weight: 500; letter-spacing: 0; }
.tab small { display: block; font-size: 14px; color: var(--light-body); letter-spacing: 0.01em; }
.tab[aria-selected="true"] { background: var(--rule); color: var(--white); border-color: var(--rule); }
.tab[aria-selected="true"] small { color: var(--body); }
.tab[aria-selected="true"]::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--coral); }

.panel { display: grid; gap: 28px; }
.inline-benefit { font-size: clamp(1.4rem, 1rem + 1.4vw, 1.75rem); line-height: 1.18; letter-spacing: -0.018em; font-weight: 500; max-width: 900px; }
.inline-benefit span { font-weight: 400; color: var(--inline-muted); }
.pair { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: 17.6px; }

.window { background: var(--light-media); border: 1px solid var(--light-rule); border-radius: 16px; overflow: hidden; display: flex; flex-direction: column; min-width: 0; }
.window-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid var(--light-rule); background: var(--white); font: 400 12px var(--mono); color: var(--light-body); }
.window-bar i { width: 9px; height: 9px; border-radius: 50%; border: 1px solid var(--light-rule); }
.window-bar span { margin-left: 10px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.window-body { padding: 26px 28px 28px; display: grid; gap: 18px; align-content: start; flex: 1; }
.window-body h3 { font-size: 20px; letter-spacing: 0.013em; display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.chip { font: 400 11px/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; border: 1px solid currentColor; border-radius: 9999px; padding: 5px 9px; }
.chip.beta { color: var(--coral); }
.chip.alpha { color: var(--light-body); }
.meta { display: flex; flex-wrap: wrap; gap: 4px 18px; font: 400 13px var(--mono); color: var(--light-body); }
.meta b { color: var(--light-ink); font-weight: 500; }
.checklist { list-style: none; margin: 0; padding: 0; display: grid; border-top: 1px solid var(--light-rule); }
.checklist li { display: grid; grid-template-columns: 22px 1fr; gap: 10px; padding: 11px 0; border-bottom: 1px solid var(--light-rule); font-size: 15px; color: var(--light-body); }
.checklist li::before { content: ""; width: 14px; height: 14px; border: 1px solid var(--light-ink); border-radius: 3px; margin-top: 4px; }
.window p { color: var(--light-body); max-width: 60ch; }

.proof-card { position: relative; overflow: hidden; background: var(--rule); color: var(--fg); border-radius: 16px; padding: 32px; display: flex; flex-direction: column; justify-content: flex-end; gap: 10px; min-height: 340px; }
.proof-card .pixels { position: absolute; inset: 0; height: 100%; }
.proof-card::before { content: ""; position: absolute; inset: 0; background: linear-gradient(35deg, #202020 32%, rgba(32, 32, 32, 0) 78%); z-index: 1; }
.proof-card > :not(.pixels) { position: relative; z-index: 2; }
.proof-card .attr { font: 300 13px/1.4 var(--mono); color: var(--muted); letter-spacing: 0.018em; }
.proof-card .num { font-size: clamp(2.5rem, 5vw, 3.25rem); line-height: 1; letter-spacing: -0.031em; font-weight: 500; }
.proof-card .label { color: var(--body); font-size: 15px; }

.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; padding-top: 16px; }
.feature { display: grid; gap: 10px; align-content: start; }
.feature svg { width: 24px; height: 24px; color: var(--coral); }
.feature h3 { font-size: 17px; letter-spacing: 0; }
.feature p { color: var(--light-body); font-size: 15px; }

/* ---------- Dark proof / pipeline ---------- */
.proof .frame { padding-block: 72px 96px; display: grid; gap: 48px; }
.proof-head { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 32px 64px; align-items: end; }
.proof-head h2 { font-size: clamp(2.25rem, 5.5vw, 3.5rem); line-height: 1.15; letter-spacing: -0.031em; margin-top: 16px; }
.proof-head p { color: var(--body); }
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.stat { padding: 36px 32px; border-left: 1px solid var(--rule); display: grid; gap: 12px; }
.stat:first-child { border-left: 0; padding-left: 0; }
.stat b { font-size: clamp(3rem, 6vw, 4rem); line-height: 1; letter-spacing: -0.031em; font-weight: 500; }
.stat span { color: var(--body); }
.stages { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 32px; counter-reset: s; }
.stages li { display: grid; gap: 10px; align-content: start; counter-increment: s; padding-top: 20px; border-top: 1px solid var(--rule); }
.stages li::before { content: counter(s, decimal-leading-zero) " / " attr(data-stage); font: 400 13px var(--mono); color: var(--coral); text-transform: uppercase; letter-spacing: 0.04em; }
.stages h3 { font-size: 18px; letter-spacing: 0; }
.stages p { color: var(--body); font-size: 15px; }
.stages .who { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.stages .who a, .stages .who span { font: 400 12px var(--mono); text-decoration: none; border: 1px dashed var(--edge); border-radius: 8px; padding: 4px 10px; color: var(--body); }
.stages .who a { color: var(--fg); border-style: solid; }
.stages .who a:hover { border-color: var(--muted); }

/* ---------- Feedback: heading beside ruled rows ---------- */
.feedback { border-top: 1px solid var(--rule); }
.feedback .frame { padding-block: 96px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px 64px; }
.feedback-copy { display: grid; gap: 18px; align-content: start; justify-items: start; }
.feedback-copy h2 { font-size: clamp(2rem, 4.2vw, 2.5rem); line-height: 1.2; letter-spacing: -0.02em; }
.feedback-copy p { color: var(--body); max-width: 52ch; }
.report { border-left: 1px solid var(--rule); padding-left: 32px; display: grid; align-content: start; }
.report .cap { font: 300 13px var(--mono); color: var(--caption); padding-bottom: 14px; }
.report dl { margin: 0; }
.report dl div { display: grid; grid-template-columns: 9.5rem 1fr; gap: 16px; padding: 16px 0; border-top: 1px solid var(--rule); }
.report dt { font: 400 13px/1.6 var(--mono); color: var(--coral); letter-spacing: 0.02em; }
.report dd { margin: 0; color: var(--fg); }
.report .foot { padding-top: 16px; border-top: 1px solid var(--rule); font: 300 13px var(--mono); color: var(--muted); }

/* ---------- White closing band ---------- */
.closing { background: radial-gradient(60% 80% at 50% 0%, #eef2ff 0%, #ffffff 70%); color: var(--canvas); border-top: 1px solid var(--rule); }
.closing .frame { max-width: 1024px; padding-block: 96px; display: grid; justify-items: center; text-align: center; gap: 24px; }
.closing h2 { font-size: clamp(2rem, 5vw, 3rem); line-height: 1.1; letter-spacing: -0.031em; }
.closing p { color: var(--light-body); }
.closing hr { width: 100%; max-width: 640px; border: 0; border-top: 1px solid rgba(0, 0, 0, 0.1); margin: 16px 0 8px; }
.guide-card { display: flex; align-items: center; gap: 24px; max-width: 640px; width: 100%; text-align: left; background: var(--white); border: 1px solid rgba(0, 0, 0, 0.1); border-radius: 16px; padding: 22px 28px; box-shadow: rgba(0, 0, 0, 0.04) 0 1px 2px; text-decoration: none; transition: border-color .2s; }
.guide-card:hover { border-color: rgba(0, 0, 0, 0.25); }
.guide-card svg { flex: none; width: 54px; height: 64px; }
.guide-card b { display: block; font-weight: 500; }
.guide-card span { color: var(--light-body); font-size: 15px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--canvas); }
.site-footer .inner { max-width: 1280px; margin: 0 auto; padding: 96px max(var(--pad), env(safe-area-inset-left, 0px)) 40px; display: grid; gap: 72px; }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) repeat(3, minmax(0, 1fr)); gap: 56px; }
.footer-brand { display: grid; gap: 14px; align-content: start; }
.footer-brand p { font: 300 13px/1.6 var(--mono); color: var(--muted); }
.footer-col { display: grid; gap: 6px; align-content: start; }
.footer-col h4 { font: 400 13px var(--mono); color: var(--caption); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 8px; }
.footer-col a { font-size: 14px; letter-spacing: 0.018em; text-decoration: none; opacity: .9; padding: 4px 0; transition: opacity .2s; }
.footer-col a:hover { opacity: 1; }
.legal { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font: 300 12px var(--mono); color: var(--caption); border-top: 1px solid var(--rule); padding-top: 24px; }

/* ---------- Motion ---------- */
@media (prefers-reduced-motion: no-preference) {
  .room h1 .line { animation: rise .6s cubic-bezier(0.16, 1, 0.3, 1) both; }
  .room h1 .line:nth-child(2) { animation-delay: .12s; }
  .hero-support { animation: fade .8s ease .55s both; }
  .room .btn-mono, .plate { animation: fade .8s ease .7s both; }
  @keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
  @keyframes fade { from { opacity: 0; } to { opacity: 1; } }
}

/* ---------- Responsive ---------- */
@media (max-width: 1200px) {
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 900px) {
  :root { --pad: 24px; }
  .nav { display: none; }
  .nav-bar .inner { grid-template-columns: 1fr auto; }
  .tabs, .pair, .features, .proof-head, .feedback .frame { grid-template-columns: 1fr; }
  .stages { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .report { border-left: 0; padding-left: 0; }
  .stage .frame { padding-block: 56px 96px; }
}
@media (max-width: 600px) {
  :root { --pad: 16px; }
  .room-inner { padding-block: 56px 64px; }
  .plate { border-radius: 20px; padding: 18px 16px; }
  .plate-cols, .plate-row { grid-template-columns: 4.6rem repeat(4, minmax(0, 1fr)); }
  .plate-cols { font-size: 9.5px; }
  .stats { grid-template-columns: 1fr; }
  .stat, .stat:first-child { border-left: 0; padding: 24px 0; }
  .stat + .stat { border-top: 1px solid var(--rule); }
  .stages { grid-template-columns: 1fr; }
  .report dl div { grid-template-columns: 1fr; gap: 4px; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px 24px; }
  .problem .frame, .feedback .frame, .closing .frame { padding-block: 64px; }
  .guide-card { padding: 18px; gap: 16px; }
}
[data-feedback][aria-disabled="true"] { opacity: .45; pointer-events: none; cursor: default; }
[hidden] { display: none !important; }