@import url("https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap");

/* 808 Strata landing page (Dash).
   Everything is scoped under .strata-landing and every class is prefixed "sl-"
   so it cannot collide with Bootstrap / Mantine styles used by the rest of the app.
   Dark-first. To force a theme, set data-theme="dark" or "light" on the #strata-landing element. */

.strata-landing {
  --bg: #1C2B2E;
  --bg-raised: #223538;
  --fg: #F2EFE8;
  --muted: #A3B3AE;
  --line: rgba(242, 239, 232, 0.16);
  --signal: #2E86AB;
  --signal-ink: #62B5D8;
  --ochre: #C97B4A;
  --clay: #3F6259;
  --h-fg: #F2EFE8;
  --h-dim: rgba(242, 239, 232, 0.72);
  --h-line: rgba(242, 239, 232, 0.28);
  --font-display: "Chakra Petch", "Segoe UI", system-ui, sans-serif;
  --font-data: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  color-scheme: dark;

  position: relative;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.55;
}
@media (prefers-color-scheme: light) {
  .strata-landing:not([data-theme="dark"]) {
    --bg: #F2EFE8;
    --bg-raised: #E8E4DA;
    --fg: #1C2B2E;
    --muted: #546560;
    --line: rgba(28, 43, 46, 0.18);
    --signal-ink: #1F6A89;
    color-scheme: light;
  }
}
.strata-landing[data-theme="light"] {
  --bg: #F2EFE8;
  --bg-raised: #E8E4DA;
  --fg: #1C2B2E;
  --muted: #546560;
  --line: rgba(28, 43, 46, 0.18);
  --signal-ink: #1F6A89;
  color-scheme: light;
}

.strata-landing, .strata-landing * { box-sizing: border-box; }
.strata-landing img { max-width: 100%; }
.strata-landing a { color: inherit; }
.strata-landing a:hover { color: inherit; }
.strata-landing :focus-visible { outline: 2px solid var(--signal-ink); outline-offset: 3px; }

.strata-landing .sl-gutter {
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.strata-landing .sl-wrap { font-family: Arial, Helvetica, sans-serif; max-width: 1180px; margin-inline: auto; }

.strata-landing .sl-kicker { font-family: Arial, Helvetica, sans-serif; font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--signal-ink); margin: 0 0 14px; }
.strata-landing h2.sl-title { margin: 0 0 16px; font-family: Arial, Helvetica, sans-serif; font-size: clamp(1.6rem, 3.6vw, 2.7rem); line-height: 1.08; font-weight: 600; text-wrap: balance; max-width: 20ch; color: inherit; }
.strata-landing .sl-lede { font-family: var(--font-data); color: var(--muted); max-width: 52ch; margin: 0; font-size: 1.02rem; }
.strata-landing .sl-dark { background: #1C2B2E; color: var(--h-fg); }
.strata-landing .sl-dark .sl-kicker { color: #62B5D8; }
.strata-landing .sl-dark .sl-lede { color: var(--h-dim); }

/* ---------- 1. hero: pinned shader stage ---------- */
.strata-landing .sl-scroll { position: relative; height: 420vh; background: #1C2B2E; }
.strata-landing .sl-stage {
  position: sticky; top: 0;
  height: 100vh; height: 100svh;
  overflow: hidden;
  background: radial-gradient(120% 90% at 30% 20%, #3F6259 0%, #1C2B2E 60%);
  color: var(--h-fg);
}
.strata-landing .sl-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.strata-landing.sl-no-gl .sl-stage canvas, .strata-landing.sl-no-gl .sl-demo canvas { display: none; }
.strata-landing .sl-stage::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(to bottom, rgba(18, 28, 30, 0.62) 0%, rgba(18, 28, 30, 0) 22%),
    linear-gradient(to top, rgba(18, 28, 30, 0.88) 0%, rgba(18, 28, 30, 0.55) 34%, rgba(18, 28, 30, 0) 62%);
}
.strata-landing .sl-stage-inner {
  position: relative; z-index: 2;
  height: 100%;
  display: grid; grid-template-rows: auto 1fr auto;
  padding-block: 20px 28px;
  max-width: 1180px; margin-inline: auto;
}
.strata-landing .sl-topbar { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.strata-landing .sl-mark { font-weight: 700; letter-spacing: 0.14em; font-size: 15px; text-transform: uppercase; text-decoration: none; padding: 0; background: none; color: inherit; }
.strata-landing .sl-mark span { color: var(--ochre); }
.strata-landing .sl-hud {
  font-family: var(--font-data); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  display: grid; grid-template-columns: auto auto; gap: 2px 14px; text-align: left;
  color: var(--h-dim);
}
.strata-landing .sl-hud b { color: var(--h-fg); font-weight: 500; font-variant-numeric: tabular-nums; }
.strata-landing .sl-hud .sl-sig { color: #62B5D8; }

.strata-landing .sl-bottom { display: grid; gap: 22px; align-self: end; min-width: 0; }
.strata-landing h1 {
  margin: 0; font-family: var(--font-display); font-weight: 600; text-wrap: balance; color: inherit;
  font-size: clamp(2.1rem, 6.4vw, 5.2rem); line-height: 1.02; letter-spacing: -0.01em;
  max-width: 14ch;
}
.strata-landing h1 em { font-style: normal; color: var(--ochre); }
.strata-landing .sl-row { display: flex; gap: 28px 48px; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; margin: 0; }
.strata-landing .sl-captions { display: grid; min-width: 0; flex: 1 1 320px; max-width: 460px; }
.strata-landing .sl-cap {
  grid-area: 1 / 1; opacity: 0; transform: translateY(8px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
.strata-landing .sl-stage[data-phase="0"] .sl-cap[data-i="0"],
.strata-landing .sl-stage[data-phase="1"] .sl-cap[data-i="1"],
.strata-landing .sl-stage[data-phase="2"] .sl-cap[data-i="2"] { opacity: 1; transform: none; }
.strata-landing .sl-cap h2 {
  margin: 0 0 6px; font-family: var(--font-data); font-weight: 500; font-size: 12px;
  letter-spacing: 0.16em; text-transform: uppercase; color: #62B5D8; line-height: 1.55;
}
.strata-landing .sl-cap p {font-family: var(--font-data); margin: 0; color: var(--h-dim); font-size: 1.02rem; max-width: 42ch; }
.strata-landing .sl-track { display: grid; gap: 10px; min-width: 0; flex: 0 1 300px; width: 100%; }
.strata-landing .sl-phases { display: flex; justify-content: space-between; gap: 10px; font-family: var(--font-data); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--h-dim); }
.strata-landing .sl-phases span { transition: color 0.3s; }
.strata-landing .sl-stage[data-phase="0"] .sl-phases span:nth-child(1),
.strata-landing .sl-stage[data-phase="1"] .sl-phases span:nth-child(2),
.strata-landing .sl-stage[data-phase="2"] .sl-phases span:nth-child(3) { color: var(--h-fg); }
.strata-landing .sl-bar { height: 2px; background: var(--h-line); position: relative; }
.strata-landing .sl-bar i { position: absolute; inset: 0 auto 0 0; width: 0%; background: var(--ochre); display: block; }
.strata-landing .sl-hint { font-family: var(--font-data); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--h-dim); }
.strata-landing .sl-sample { font-family: var(--font-data); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--h-dim); }

/* ---------- pinned sections (accuracy, sources) ---------- */
.strata-landing .sl-pin { position: relative; }
.strata-landing .sl-pinstage {
  position: sticky; top: 0; height: 100vh; height: 100svh; overflow: hidden;
  display: flex; align-items: center;
}
.strata-landing .sl-pinstage > .sl-gutter { width: 100%; }

/* 2. accuracy */
.strata-landing .sl-pin-acc { height: 340vh; background: var(--bg); }
.strata-landing .sl-acc-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: clamp(24px, 5vw, 72px); align-items: center; }
.strata-landing .sl-readouts { margin: 28px 0 0; padding: 0; list-style: none; }
.strata-landing .sl-ro {
  display: grid; grid-template-columns: minmax(118px, 160px) minmax(0, 1fr); gap: 4px 18px; align-items: center;
  padding: 14px 0; border-top: 1px solid var(--line); opacity: 0.38; transition: opacity 0.3s;
}
.strata-landing .sl-ro:last-child { border-bottom: 1px solid var(--line); }
.strata-landing .sl-ro.on { opacity: 1; }
.strata-landing .sl-ro .sl-n { font-family: var(--font-data); font-weight: 500; font-size: clamp(1.6rem, 3.2vw, 2.4rem); line-height: 1.1; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.strata-landing .sl-ro .sl-n small { font-family: var(--font-data); font-size: 0.5em; color: var(--ochre); margin-left: 3px; letter-spacing: 0; }
.strata-landing .sl-ro p { font-family: var(--font-data); margin: 0; color: var(--muted); font-size: 0.95rem; }
.strata-landing .sl-acc-fig { margin: 0; min-width: 0; }
.strata-landing .sl-acc-fig svg { width: 100%; height: auto; display: block; overflow: visible; }
.strata-landing .sl-acc-fig figcaption { font-family: var(--font-data); font-size: 11px; letter-spacing: 0.06em; color: var(--muted); margin-top: 10px; }
.strata-landing .sl-axis { stroke: var(--line); }
.strata-landing .sl-zero { stroke: var(--fg); opacity: 0.5; }
.strata-landing .sl-thr { stroke: var(--ochre); stroke-dasharray: 5 5; }
.strata-landing .sl-band { fill: var(--signal); opacity: 0.16; }
.strata-landing .sl-bandline { stroke: var(--signal-ink); stroke-width: 1; }
.strata-landing .sl-tick { fill: var(--muted); font: 11px var(--font-data); }
.strata-landing .sl-thrtxt { fill: var(--ochre); font: 11px var(--font-data); letter-spacing: 0.06em; }
.strata-landing .sl-in { fill: var(--signal-ink); }
.strata-landing .sl-out { fill: var(--ochre); }
.strata-landing .sl-big { font: 500 34px var(--font-data); fill: var(--fg); }

/* 3. data sources */
.strata-landing .sl-pin-src { height: 600vh; background: var(--bg-raised); }
.strata-landing .sl-src-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(24px, 5vw, 72px); align-items: center; }
.strata-landing .sl-src-list { list-style: none; margin: 26px 0 0; padding: 0; border-top: 1px solid var(--line); }
.strata-landing .sl-src-list li { border-bottom: 1px solid var(--line); padding: 12px 0; opacity: 0.45; transition: opacity 0.3s; }
.strata-landing .sl-src-list li.on { opacity: 1; }
.strata-landing .sl-src-list strong { font-size: 1.15rem; font-weight: 600; display: flex; gap: 12px; align-items: center; }
.strata-landing .sl-src-list strong::before { content: ""; width: 8px; height: 8px; background: var(--line); transition: background 0.3s; }
.strata-landing .sl-src-list li.on strong::before { background: var(--ochre); }
.strata-landing .sl-src-list .sl-src-d { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.35s ease; }
.strata-landing .sl-src-list li.on .sl-src-d { grid-template-rows: 1fr; }
.strata-landing .sl-src-list .sl-src-d span { overflow: hidden; min-height: 0; color: var(--muted); padding-left: 20px; }
.strata-landing .sl-src-list li.on .sl-src-d span { padding-top: 6px; }
.strata-landing .sl-src-viz { position: relative; width: 100%; aspect-ratio: 1 / 1; max-height: 74svh; border: 1px solid var(--line); background: var(--bg); }
.strata-landing .sl-src-viz canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.strata-landing .sl-src-tag { position: absolute; left: 12px; bottom: 10px; font-family: var(--font-data); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }

/* 4. demo */
.strata-landing .sl-demo { position: relative; min-height: 92vh; min-height: 92svh; display: flex; align-items: center; overflow: hidden; }
.strata-landing .sl-demo canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.strata-landing .sl-demo::after { content: ""; position: absolute; inset: 0; pointer-events: none; background: linear-gradient(to right, rgba(18, 28, 30, 0.92) 0%, rgba(18, 28, 30, 0.7) 40%, rgba(18, 28, 30, 0) 75%); }
.strata-landing .sl-demo .sl-gutter { position: relative; z-index: 2; width: 100%; padding-block: 72px; }
.strata-landing .sl-cta { display: flex; gap: 18px 28px; flex-wrap: wrap; align-items: center; margin-top: 30px; }
.strata-landing .sl-btn { display: inline-block; padding: 14px 22px; background: var(--signal); color: #fff; text-decoration: none; font-weight: 600; letter-spacing: 0.04em; border-radius: 2px; border: 1px solid var(--signal); }
.strata-landing .sl-btn:hover { background: #3A97BD; border-color: #3A97BD; color: #fff; }
.strata-landing .sl-btn-ghost { background: transparent; border-color: var(--h-line); color: var(--h-fg); }
.strata-landing .sl-btn-ghost:hover { background: rgba(242, 239, 232, 0.08); border-color: var(--h-dim); color: var(--h-fg); }
.strata-landing .sl-fine { font-family: var(--font-data); font-size: 12px; color: var(--h-dim); }
.strata-landing .sl-hover-hint { font-family: var(--font-data); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--h-dim); margin: 22px 0 0; }

/* 5. footer wordmark */
.strata-landing .sl-foot { padding-block: clamp(48px, 8vw, 96px) 36px; border-top: 1px solid var(--h-line); }
.strata-landing .sl-word {
  --fill: 0%;
  margin: 0; font-weight: 600; text-transform: uppercase; letter-spacing: 0.021em; line-height: 0.95;
  font-size: clamp(1.8rem, 14.5vw, 11.5rem);
  color: transparent; -webkit-text-stroke: 1.5px var(--h-dim);
  -webkit-background-clip: text; background-clip: text;
  white-space: nowrap; overflow: hidden; max-width: 100%;
  font-family: var(--font-display);
}
.strata-landing .sl-foot-meta { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 28px; font-family: var(--font-data); font-size: 12px; letter-spacing: 0.06em; color: var(--h-dim); }
.strata-landing .sl-foot-links { display: flex; gap: 8px 24px; flex-wrap: wrap; margin-top: 16px; font-family: var(--font-data); font-size: 12px; letter-spacing: 0.06em; }
.strata-landing .sl-foot-links a { color: var(--h-dim); text-decoration: none; }
.strata-landing .sl-foot-links a:hover { color: var(--h-fg); text-decoration: underline; }

/* global rail */
.strata-landing .sl-rail {
  position: fixed; z-index: 20; pointer-events: none;
  right: max(16px, env(safe-area-inset-right, 0px)); bottom: calc(14px + env(safe-area-inset-bottom, 0px));
  display: flex; gap: 10px; align-items: center; padding: 7px 10px;
  background: var(--bg-raised); color: var(--fg); border: 1px solid var(--line);
  font-family: var(--font-data); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  opacity: 0; transition: opacity 0.3s;
}
.strata-landing .sl-rail i { display: block; width: 56px; height: 2px; background: var(--line); position: relative; }
.strata-landing .sl-rail b { position: absolute; left: 0; top: 0; bottom: 0; width: 0; background: var(--ochre); }
.strata-landing .sl-rail span { font-variant-numeric: tabular-nums; }

@media (max-width: 820px) {
  .strata-landing .sl-acc-grid, .strata-landing .sl-src-grid { grid-template-columns: 1fr; gap: 16px; }
  .strata-landing .sl-pin .sl-lede { font-family: var(--font-data); display: none; }
  .strata-landing .sl-readouts { margin-top: 16px; }
  .strata-landing .sl-ro { padding: 9px 0; grid-template-columns: 96px minmax(0, 1fr); }
  .strata-landing .sl-ro p { font-size: 0.86rem; }
  .strata-landing .sl-src-viz { aspect-ratio: auto; height: 34svh; order: -1; }
  .strata-landing .sl-src-list { margin-top: 14px; }
  .strata-landing .sl-src-list li { padding: 8px 0; }
  .strata-landing .sl-src-grid h2.sl-title, .strata-landing .sl-acc-grid h2.sl-title { font-size: 1.45rem; margin-bottom: 4px; }
  .strata-landing .sl-demo::after { background: linear-gradient(to top, rgba(18, 28, 30, 0.92) 0%, rgba(18, 28, 30, 0.72) 55%, rgba(18, 28, 30, 0.2) 100%); }
}
@media (prefers-reduced-motion: reduce) {
  .strata-landing .sl-cap, .strata-landing .sl-ro, .strata-landing .sl-src-list li, .strata-landing .sl-src-list .sl-src-d { transition: none; }
  .strata-landing .sl-cap { transform: none; }
}