/*
 * site.css — layout, components and the scroll-scene stages.
 * Depends on tokens.css (all colour/space/motion) and type.css (the scale).
 */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  margin: 0;
  background: var(--c-bg);
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

/* Lenis smooth-scroll wiring. */
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-stopped { overflow: clip; }

img, svg { display: block; max-width: 100%; }

a { color: var(--c-accent); text-decoration: none; }
a:hover { color: var(--c-accent-press); text-decoration: underline; }

::selection { background: var(--c-accent-soft); color: var(--c-text); }

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

/* ---- Layout primitives ------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section {
  padding-block: var(--space-10);
}

.stack > * + * { margin-top: var(--space-4); }
.stack-lg > * + * { margin-top: var(--space-6); }

.measure { max-width: var(--measure); }

.grid { display: grid; gap: var(--space-5); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.01em;
  padding: 0.28em 0.7em;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-line);
  color: var(--c-text-dim);
  background: var(--c-surface);
}
.badge .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--c-ok); box-shadow: 0 0 0 3px var(--c-ok-soft);
}

/* ---- Buttons ---------------------------------------------------------- */
.btn {
  --btn-bg: var(--c-surface);
  --btn-fg: var(--c-text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font: inherit;
  font-weight: 500;
  line-height: 1;
  padding: 0.85em 1.35em;
  border-radius: 6px;
  border: 1px solid var(--c-line-strong);
  background: var(--btn-bg);
  color: var(--btn-fg);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.btn:hover { background: var(--btn-bg); }
.btn:active { transform: none; }
.btn-primary {
  --btn-bg: var(--c-accent);
  --btn-fg: var(--c-on-accent);
  border-color: transparent;
  box-shadow: var(--shadow-2);
}
.btn-primary:hover { --btn-bg: var(--c-accent-press); color: var(--c-on-accent); }
.btn-ghost { --btn-bg: transparent; border-color: var(--c-line-strong); }
.btn-lg { padding: 1.05em 1.7em; font-size: var(--step-0); }

/* ---- Nav -------------------------------------------------------------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-5);
  background: color-mix(in srgb, var(--c-bg) 94%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--c-line);
  transition: border-color var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out);
}
.nav[data-scrolled="true"] { background: color-mix(in srgb, var(--c-bg) 96%, transparent); }
.nav-brand {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-weight: 600; letter-spacing: var(--tracking-snug); color: var(--c-text);
}
/* Branded wordmark logo (dark artwork) sits in a rounded tile so it reads as
   intentional on the light theme too. */
.brand-logo {
  height: 38px; width: auto; display: block;
  border-radius: 9px;
}
.footer-logo { height: 52px; width: auto; border-radius: 10px; display: block; }
.nav-links { display: flex; align-items: center; gap: var(--space-5); }
.nav-links a { color: var(--c-text-dim); font-size: var(--step--1); }
.nav-links a:hover { color: var(--c-text); }
.nav-links a[aria-current="page"] { color: var(--c-text); font-weight: 500; }
.nav-actions { display: flex; align-items: center; gap: var(--space-3); }
.theme-toggle {
  width: 38px; height: 38px; display: grid; place-items: center;
  border-radius: 6px; border: 1px solid var(--c-line-strong);
  background: var(--c-surface); color: var(--c-text-dim); cursor: pointer;
}
.theme-toggle:hover { color: var(--c-text); }
.nav-toggle {
  display: none;
  width: 38px; height: 38px; place-items: center;
  border-radius: 6px; border: 1px solid var(--c-line-strong);
  background: var(--c-surface); cursor: pointer;
}
.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block; width: 16px; height: 1.5px; background: var(--c-text);
  position: relative;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: ""; position: absolute; left: 0;
}
.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }
body[data-nav-open] .nav-toggle-bars { background: transparent; }
body[data-nav-open] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
body[data-nav-open] .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }
@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-toggle { display: grid; }
}

/* Ink nav while the masthead is in view (homepage only). */
.nav[data-over-ink] {
  background: color-mix(in srgb, var(--c-ink) 88%, transparent);
  border-bottom-color: var(--c-ink-line);
}
.nav[data-over-ink] .nav-links a { color: var(--c-on-ink-dim); }
.nav[data-over-ink] .nav-links a:hover { color: var(--c-on-ink); }
.nav[data-over-ink] .theme-toggle,
.nav[data-over-ink] .nav-toggle {
  background: var(--c-ink-2);
  border-color: var(--c-ink-line);
  color: var(--c-on-ink);
}
.nav[data-over-ink] .nav-toggle-bars,
.nav[data-over-ink] .nav-toggle-bars::before,
.nav[data-over-ink] .nav-toggle-bars::after {
  background: var(--c-on-ink);
}

/* ---- Scroll scenes ---------------------------------------------------- */
/*
 * A scene reserves scroll length via a tall wrapper; its .stage is pinned
 * (sticky) and fills the viewport while the scene plays. `overflow: clip`
 * (never hidden) so pinning survives across scenes.
 */
.scene {
  position: relative;
  overflow: clip;
}
.scene-tall { height: 185vh; }        /* scroll budget per scene — tuned for pace */
.scene-hero { height: 120vh; }        /* hero only fades out — needs less */
.stage {
  position: sticky;
  top: 0;
  height: 100vh;
  display: grid;
  place-items: center;
  overflow: clip;
}
.stage-inner {
  width: 100%;
  max-width: var(--container);
  padding-inline: var(--space-5);
}

.scene-kicker {
  display: flex; align-items: center; gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.scene-kicker .idx {
  font-family: var(--font-mono); font-size: var(--step--1);
  color: var(--c-text-dim); letter-spacing: 0.04em;
}
.scene-title { font-size: var(--step-3); max-width: 22ch; }
.scene-sub { color: var(--c-text-dim); max-width: 52ch; margin-top: var(--space-3); }

/* ---- Hero ------------------------------------------------------------- */
.hero { position: relative; }
.hero-bg {
  position: absolute; inset: 0; z-index: 0; overflow: clip;
  background:
    radial-gradient(60% 50% at 50% 8%, var(--c-accent-soft), transparent 70%);
}
.hero-grid {
  position: absolute; inset: -20% -10% 0 -10%; z-index: 0;
  background-image:
    linear-gradient(var(--c-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(70% 60% at 50% 30%, #000 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(70% 60% at 50% 30%, #000 40%, transparent 80%);
  opacity: 0.7;
}
.hero-inner { position: relative; z-index: 1; text-align: center; }
.hero h1 { margin: 0 auto; max-width: 16ch; }
.hero .lead { margin: var(--space-5) auto 0; max-width: 56ch; }
.hero-cta { display: inline-flex; gap: var(--space-3); margin-top: var(--space-7); flex-wrap: wrap; justify-content: center; }
.hero-scrollcue {
  position: absolute; left: 50%; bottom: var(--space-6); transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: var(--space-2);
  color: var(--c-text-mute); font-family: var(--font-mono); font-size: var(--step--1);
  z-index: 1;
}
.hero-scrollcue .rail { width: 1px; height: 42px; background: linear-gradient(var(--c-line-strong), transparent); }

/* ---- Answer cards (scene 2) ------------------------------------------- */
.answers { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); align-items: start; margin-top: var(--space-6); }
@media (max-width: 780px) { .answers { grid-template-columns: 1fr; } }
.answer {
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  background: var(--c-surface);
  box-shadow: var(--shadow-1);
  overflow: clip;
}
.answer-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--c-line);
  font-size: var(--step--1);
}
.answer-head .who { display: inline-flex; gap: var(--space-2); align-items: center; font-weight: 500; }
.answer-body { padding: var(--space-4); }
.claim {
  display: flex; gap: var(--space-3); align-items: flex-start;
  padding: var(--space-3) 0; border-bottom: 1px solid var(--c-line);
}
.claim:last-child { border-bottom: 0; }
.claim .txt { flex: 1; }
.claim .status {
  flex: none; width: 20px; height: 20px; border-radius: 50%;
  display: grid; place-items: center; font-size: 12px;
  border: 1px solid var(--c-line-strong); color: var(--c-text-mute);
}
.claim[data-state="ok"] .status { background: var(--c-ok-soft); color: var(--c-ok); border-color: transparent; }
.claim[data-state="bad"] .status { background: var(--c-bad-soft); color: var(--c-bad); border-color: transparent; }
.claim[data-state="bad"] .txt { color: var(--c-text-mute); text-decoration: line-through; text-decoration-color: var(--c-bad); }
.cite {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 6px;
  font-family: var(--font-mono); font-size: 0.72em; color: var(--c-accent);
  background: var(--c-accent-soft); padding: 2px 8px; border-radius: var(--radius-pill);
}
.answer[data-fate="dissolve"] { border-style: dashed; }

/* ---- Layers (scene 3) ------------------------------------------------- */
.layers { display: grid; gap: var(--space-4); margin-top: var(--space-6); }
.layer {
  position: relative;
  display: grid; grid-template-columns: auto 1fr auto; gap: var(--space-4); align-items: center;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  background: var(--c-surface); box-shadow: var(--shadow-1);
}
/* Opacity-only highlight so the active-layer pulse never animates box-shadow. */
.layer-glow {
  position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  box-shadow: var(--shadow-3); border: 1px solid var(--layer-c, var(--c-accent));
  opacity: 0;
}
.layer .lnum {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  font-family: var(--font-mono); font-weight: 600; color: var(--c-on-accent);
  background: var(--layer-c, var(--c-accent));
}
.layer[data-layer="1"] { --layer-c: var(--c-layer-1); }
.layer[data-layer="2"] { --layer-c: var(--c-layer-2); }
.layer[data-layer="3"] { --layer-c: var(--c-layer-3); }
.layer .lname { font-weight: 600; }
.layer .ldesc { color: var(--c-text-dim); font-size: var(--step--1); margin-top: 2px; }
.layer .lstate { font-family: var(--font-mono); font-size: var(--step--1); color: var(--c-text-mute); }
.layer[data-locked="true"] { opacity: 0.55; }
.layer[data-locked="true"] .lstate { color: var(--c-warn); }
.query-chip {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-mono); font-size: var(--step--1);
  padding: 0.5em 0.9em; border-radius: var(--radius-pill);
  background: var(--c-accent); color: var(--c-on-accent); box-shadow: var(--shadow-2);
}

/* ---- Firewall (scene 4) ----------------------------------------------- */
.firewall { position: relative; margin-top: var(--space-6); min-height: 320px; }
.doc {
  border: 1px solid var(--c-line); border-radius: var(--radius-md);
  background: var(--c-surface); box-shadow: var(--shadow-1);
  padding: var(--space-4); font-family: var(--font-mono); font-size: var(--step--1);
  line-height: 1.7; max-width: 640px;
}
.doc .payload {
  background: var(--c-bad-soft); color: var(--c-bad);
  padding: 0 4px; border-radius: 4px; text-decoration: line-through;
}
.doc .clean { color: var(--c-text-dim); }
.scanline {
  position: absolute; left: 0; right: 0; top: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-accent), transparent);
  box-shadow: 0 0 18px 2px var(--c-accent); opacity: 0;
}
.verdict {
  display: inline-flex; align-items: center; gap: var(--space-2); margin-top: var(--space-4);
  font-family: var(--font-mono); font-size: var(--step--1);
  padding: 0.5em 0.9em; border-radius: var(--radius-pill);
  background: var(--c-bad-soft); color: var(--c-bad);
}

/* ---- Receipts + scoreboard (scene 5) ---------------------------------- */
.receipts { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--space-6); margin-top: var(--space-6); align-items: start; }
@media (max-width: 860px) { .receipts { grid-template-columns: 1fr; } }
.scoreboard {
  border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  background: var(--c-surface); box-shadow: var(--shadow-2); padding: var(--space-5);
}
.score-row { display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-4); padding: var(--space-3) 0; border-bottom: 1px solid var(--c-line); }
.score-row:last-child { border-bottom: 0; }
.score-num { font-family: var(--font-mono); font-size: var(--step-2); font-weight: 600; }
.score-num .den { color: var(--c-text-mute); font-size: 0.6em; }
.fail-list { margin-top: var(--space-4); font-family: var(--font-mono); font-size: var(--step--1); color: var(--c-text-dim); }
.fail-list .fail-id { color: var(--c-bad); }

/* ---- Generic content sections ----------------------------------------- */
.section-head { max-width: var(--measure); margin-bottom: var(--space-7); }
.card {
  border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  background: var(--c-surface); box-shadow: var(--shadow-1);
  padding: var(--space-5);
}
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); gap: var(--space-5); }

.metric { display: grid; gap: 2px; }
.metric b { font-family: var(--font-mono); font-size: var(--step-1); font-weight: 600; }
.metric span { color: var(--c-text-mute); font-size: var(--step--1); }
.metric-row { display: flex; gap: var(--space-6); flex-wrap: wrap; margin-top: var(--space-4); }

.reveal { will-change: transform, opacity; }

/* ---- Agent demo ------------------------------------------------------- */
.agent-shell {
  border: 1px solid var(--c-line); border-radius: var(--radius-xl);
  background: var(--c-surface); box-shadow: var(--shadow-2); overflow: clip;
}
.agent-top { display: flex; gap: var(--space-3); padding: var(--space-4); border-bottom: 1px solid var(--c-line); }
.agent-input {
  flex: 1; font: inherit; padding: 0.85em 1em; border-radius: var(--radius-md);
  border: 1px solid var(--c-line-strong); background: var(--c-bg); color: var(--c-text);
}
.agent-input:focus-visible { box-shadow: var(--focus-ring); }
.trace { padding: var(--space-4); display: grid; gap: var(--space-3); min-height: 180px; }
.trace-empty { margin: 0; color: var(--c-text-mute); font-size: var(--step--1); }
.trace-step {
  display: grid; grid-template-columns: auto 1fr; gap: var(--space-3); align-items: start;
  font-family: var(--font-mono); font-size: var(--step--1);
  opacity: 0; transform: translateY(6px);
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.trace-step.show { opacity: 1; transform: none; }
.trace-step .tick {
  width: 18px; height: 18px; border-radius: 50%; display: grid; place-items: center;
  background: var(--c-ok-soft); color: var(--c-ok); font-size: 11px; margin-top: 2px;
}
.trace-step[data-kind="block"] .tick { background: var(--c-bad-soft); color: var(--c-bad); }
.trace-step[data-kind="active"] .tick { background: var(--c-accent-soft); color: var(--c-accent); }
.trace-step[data-kind="muted"] { opacity: 0.6; }
.trace-step[data-kind="muted"] .tick { background: var(--c-bg-elev); color: var(--c-text-mute); }
.trace-step .k { color: var(--c-text); font-weight: 500; }
.trace-step .v { color: var(--c-text-dim); }
.trace-note { color: var(--c-text-mute); font-size: var(--step--1); padding: 0 var(--space-4) var(--space-4); }

/* Final answer block streamed after the trace. */
.trace-answer {
  margin: var(--space-2) var(--space-4) var(--space-2);
  padding: var(--space-4);
  border: 1px solid var(--c-line); border-radius: var(--radius-md);
  background: var(--c-surface-2);
  opacity: 0; transform: translateY(6px);
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.trace-answer.show { opacity: 1; transform: none; }
.trace-answer .a-head {
  display: flex; gap: var(--space-2); flex-wrap: wrap; align-items: center;
  margin-bottom: var(--space-3);
}
.trace-answer .a-text { white-space: pre-wrap; }
.trace-answer .a-cites { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }
.a-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 0.72em; padding: 2px 8px;
  border-radius: var(--radius-pill); border: 1px solid var(--c-line);
  color: var(--c-text-dim);
}
.a-badge[data-ok="true"] { background: var(--c-ok-soft); color: var(--c-ok); border-color: transparent; }
.a-badge[data-ok="false"] { background: var(--c-bad-soft); color: var(--c-bad); border-color: transparent; }

/* ---- Ask Summaverick page --------------------------------------------- */
.ask-wrap { padding-block: calc(var(--space-9) + 48px) var(--space-9); min-height: 70vh; }
.ask-inner { max-width: 52rem; }
.ask-inner h1 { margin-top: var(--space-3); }
.ask-inner .lead { margin-top: var(--space-4); }
.composer {
  display: flex; gap: var(--space-3); align-items: flex-end;
  margin-top: var(--space-6);
  padding: var(--space-3);
  border: 1px solid var(--c-line-strong); border-radius: var(--radius-xl);
  background: var(--c-surface); box-shadow: var(--shadow-2);
}
.composer-input {
  flex: 1; font: inherit; font-size: var(--step-0); resize: none;
  border: 0; background: transparent; color: var(--c-text);
  padding: 0.6em 0.6em; max-height: 160px; line-height: 1.4;
}
.composer-input:focus { outline: none; }
.composer .btn { flex: none; }
.chips { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }
.chip {
  font: inherit; font-size: var(--step--1); cursor: pointer;
  padding: 0.5em 0.9em; border-radius: var(--radius-pill);
  border: 1px solid var(--c-line-strong); background: var(--c-surface); color: var(--c-text-dim);
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.chip:hover { color: var(--c-text); border-color: var(--c-accent); }
.ask-results { margin-top: var(--space-6); }
.ask-results .trace { min-height: 0; }

/* ---- Forms ------------------------------------------------------------ */
.field { display: grid; gap: var(--space-2); }
.field label { font-size: var(--step--1); color: var(--c-text-dim); }
.field-hint { color: var(--c-text-mute); }
.field input, .field select, .field textarea {
  font: inherit; padding: 0.75em 0.9em; border-radius: var(--radius-md);
  border: 1px solid var(--c-line-strong); background: var(--c-bg); color: var(--c-text);
}
.field textarea { min-height: 120px; resize: vertical; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } }

/* ---- A11y ------------------------------------------------------------- */
.skip {
  position: absolute; left: var(--space-4); top: 0; z-index: 200;
  transform: translateY(-120%);
  background: var(--c-accent); color: var(--c-on-accent);
  padding: 0.6em 1em; border-radius: 6px;
}
.skip:focus { transform: none; color: var(--c-on-accent); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ---- Company kicker / lede -------------------------------------------- */
.kicker {
  margin: 0 0 var(--space-3);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--c-text-dim);
  letter-spacing: 0.01em;
}
.lede {
  margin: var(--space-4) 0 0;
  max-width: 62ch;
  color: var(--c-text-dim);
  font-size: var(--step-0);
}

/* ---- Mobile nav panel ------------------------------------------------- */
.nav-panel {
  position: fixed; inset: 62px 0 0 0; z-index: 99;
  background: var(--c-bg);
  border-top: 1px solid var(--c-line);
  padding: var(--space-6) var(--space-5);
  overflow: auto;
}
.nav-panel[hidden] { display: none; }
.nav-panel nav { display: grid; gap: var(--space-2); max-width: 28rem; }
.nav-panel a {
  display: block; padding: 0.7em 0;
  color: var(--c-text); font-size: var(--step-1);
  border-bottom: 1px solid var(--c-line);
}
.nav-panel a:hover { color: var(--c-accent); }
body[data-nav-open] { overflow: hidden; }
.nav[data-over-ink] ~ .nav-panel {
  background: var(--c-ink);
  border-top-color: var(--c-ink-line);
}
.nav[data-over-ink] ~ .nav-panel a {
  color: var(--c-on-ink);
  border-bottom-color: var(--c-ink-line);
}
.nav[data-over-ink] ~ .nav-panel a:hover { color: var(--c-ink-accent); }

/* ---- Masthead --------------------------------------------------------- */
.masthead {
  padding: calc(var(--space-10) + 28px) 0 0;
  background: var(--c-ink);
  color: var(--c-on-ink);
}
.mast-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(16rem, 0.8fr);
  gap: var(--space-8);
  align-items: start;
  padding-bottom: var(--space-8);
}
.mast-copy { text-align: left; }
.mast-copy .display {
  margin: 0;
  max-width: 16ch;
  font-size: clamp(2.15rem, 1.55rem + 2.2vw, 3.45rem);
  letter-spacing: -0.028em;
  line-height: 1.05;
  color: var(--c-on-ink);
}
.mast-copy .lead {
  margin: var(--space-5) 0 0;
  max-width: 46ch;
  font-size: var(--step-0);
  line-height: var(--leading-normal);
  color: var(--c-on-ink-dim);
}
.mast-copy .kicker { color: var(--c-on-ink-mute); }
.mast-cta {
  display: flex; flex-wrap: wrap; gap: var(--space-3);
  margin-top: var(--space-6);
}
.masthead .btn-ghost {
  color: var(--c-on-ink);
  border-color: var(--c-ink-line);
  background: transparent;
}
.masthead .btn-ghost:hover { border-color: var(--c-on-ink); color: var(--c-on-ink); }
/* On the always-ink masthead and nav the mono-ink primary would vanish —
   flip it to white-on-ink so the CTA stays legible in both themes. */
.masthead .btn-primary,
.nav[data-over-ink] .btn-primary {
  --btn-bg: var(--c-on-ink);
  --btn-fg: var(--c-ink);
  border-color: transparent;
}
.masthead .btn-primary:hover,
.nav[data-over-ink] .btn-primary:hover {
  --btn-bg: #ffffff;
  color: var(--c-ink);
}
.mast-panel {
  border: 1px solid var(--c-ink-line);
  background: var(--c-ink-2);
  padding: var(--space-5);
}
.mast-panel-label {
  margin: 0 0 var(--space-4);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--c-on-ink-mute);
}
.start-list {
  list-style: none; margin: 0; padding: 0;
}
.start-list li + li { border-top: 1px solid var(--c-ink-line); }
.start-list a {
  display: block;
  padding: 0.85em 0;
  color: var(--c-on-ink);
  font-size: var(--step--1);
  line-height: 1.4;
}
.start-list a:hover { color: var(--c-ink-accent); }
.start-list a::after {
  content: " →";
  color: var(--c-on-ink-mute);
}

.trust-strip {
  background: var(--c-ink);
  border-top: 1px solid var(--c-ink-line);
  padding-block: var(--space-5);
}
.trust-row {
  display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-6);
  font-size: var(--step--1);
  color: var(--c-on-ink-mute);
  letter-spacing: 0.01em;
}

/* ---- Capabilities ----------------------------------------------------- */
.capability {
  padding-block: var(--space-7);
  border-top: 1px solid var(--c-line);
  scroll-margin-top: 80px;
}
.capability:first-of-type { border-top: 1px solid var(--c-line); }
.capability h3 {
  margin: 0;
  max-width: 28ch;
  font-size: var(--step-2);
}
.capability-body {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.9fr);
  gap: var(--space-6);
  margin-top: var(--space-5);
}
.capability-body p { margin: 0; color: var(--c-text-dim); max-width: 58ch; }
.outcomes {
  margin: 0; padding: 0; list-style: none;
}
.outcomes li {
  padding: 0.55em 0 0.55em 1.1em;
  border-bottom: 1px solid var(--c-line);
  font-size: var(--step--1);
  position: relative;
}
.outcomes li::before {
  content: "";
  position: absolute; left: 0; top: 0.95em;
  width: 6px; height: 6px;
  background: var(--c-accent);
}

#work, #platform, #contact, #engage, #capabilities { scroll-margin-top: 80px; }

/* ---- Engagements / work ---------------------------------------------- */
.engage-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-5);
}
.work-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}
.engage-card, .work-card {
  border: 1px solid var(--c-line);
  background: var(--c-surface);
  padding: var(--space-5);
}
.engage-card h3, .work-card h3 { margin: 0 0 var(--space-2); }
.engage-meta {
  margin: 0 0 var(--space-3);
  font-size: var(--step--1);
  color: var(--c-text-mute);
}
.engage-card p, .work-card p { margin: 0 0 var(--space-3); }
.engage-out, .constraint {
  margin: 0;
  font-size: var(--step--1);
  color: var(--c-text-mute);
}
.constraint { padding-top: var(--space-2); border-top: 1px solid var(--c-line); }
.stack-tags {
  display: flex; flex-wrap: wrap; gap: var(--space-2);
  margin: var(--space-4) 0 0;
}
.stack-tags span {
  font-size: 0.75em;
  padding: 0.2em 0.55em;
  border: 1px solid var(--c-line);
  color: var(--c-text-dim);
}

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: var(--space-8);
  align-items: start;
}
.contact-form {
  border: 1px solid var(--c-line);
  background: var(--c-surface);
  padding: var(--space-6);
  display: grid;
  gap: var(--space-4);
}
.contact-form .section-head { margin: 0; }

/* ---- Footer ----------------------------------------------------------- */
.footer {
  border-top: 0;
  background: var(--c-ink);
  padding-block: var(--space-8) var(--space-7);
  color: var(--c-on-ink-mute);
}
.footer a { color: var(--c-on-ink-dim); }
.footer a:hover { color: var(--c-on-ink); }
.footer-head {
  margin: 0 0 var(--space-3);
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--c-on-ink);
}
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li + li { margin-top: 0.4em; }
.footer-copy { margin-top: var(--space-5); }

@media (max-width: 1100px) {
  .engage-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 960px) {
  .mast-grid,
  .capability-body,
  .contact-grid { grid-template-columns: 1fr; }
  .work-grid { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer-cols { grid-template-columns: 1fr; }
  .masthead { padding-top: calc(var(--space-9) + 28px); }
  .nav-actions .btn { display: none; }
  .engage-grid { grid-template-columns: 1fr; }
}

/* ======================================================================== *
 * Scroll experience — Apple-style smooth scroll, tide parallax, reveals.
 * All of this is progressive: it only engages once scroll-experience.js sets
 * .sv-anim (before paint) and .sv-ready (once the motion libs are live). If a
 * vendor script fails or motion is reduced, .sv-anim is dropped and every
 * rule below collapses back to the plain, fully-visible page.
 * ======================================================================== */

/* Pre-hide reveal targets before first paint so they can rise in. Kept in sync
 * with REVEAL_SELECTOR in scroll-experience.js. */
.sv-anim .section-head,
.sv-anim .capability,
.sv-anim .work-card,
.sv-anim .engage-card,
.sv-anim .agent-shell,
.sv-anim .contact-form { opacity: 0; }
.sv-anim .trust-row span { opacity: 0; }
/* The masthead intro is a JS timeline; hide its pieces until it plays. */
.sv-anim .mast-copy > *,
.sv-anim .mast-panel { opacity: 0; }
.reveal, [data-reveal] { will-change: transform, opacity; }

/* ---- Top progress bar ------------------------------------------------- */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  height: 2px;
  pointer-events: none;
  background: transparent;
}
.scroll-progress span {
  display: block;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-accent), var(--c-layer-2));
  box-shadow: 0 0 12px color-mix(in srgb, var(--c-accent) 60%, transparent);
}

/* ---- Masthead "tide" atmosphere --------------------------------------- */
.masthead { position: relative; overflow: clip; isolation: isolate; }
.masthead .mast-grid { position: relative; z-index: 1; }
.mast-aurora {
  position: absolute;
  inset: -20% -10% -10% -10%;
  z-index: 0;
  pointer-events: none;
}
.mast-aurora__blob {
  position: absolute;
  width: 46vw;
  height: 46vw;
  max-width: 640px;
  max-height: 640px;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.5;
  will-change: transform;
}
.mast-aurora__blob--a {
  top: -12%; left: -6%;
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.22), transparent 70%);
}
.mast-aurora__blob--b {
  top: 8%; right: -8%;
  background: radial-gradient(circle at 50% 50%, rgba(200, 202, 214, 0.18), transparent 70%);
}
.mast-aurora__blob--c {
  bottom: -22%; left: 32%;
  width: 38vw; height: 38vw;
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.14), transparent 70%);
  opacity: 0.4;
}
.mast-aurora__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--c-ink-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-ink-line) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(80% 70% at 50% 20%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(80% 70% at 50% 20%, #000 30%, transparent 78%);
  opacity: 0.6;
  will-change: transform;
}
/* A soft breathing drift so the tide is alive even before you scroll. */
@keyframes mast-tide {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50%      { transform: translate3d(2%, -3%, 0) scale(1.06); }
}
.mast-aurora__blob--a { animation: mast-tide 16s var(--ease-in-out) infinite; }
.mast-aurora__blob--b { animation: mast-tide 20s var(--ease-in-out) infinite reverse; }
.mast-aurora__blob--c { animation: mast-tide 24s var(--ease-in-out) infinite; }

/* ---- Right-edge section pager (scrollspy) ----------------------------- */
.section-pager {
  position: fixed;
  right: clamp(10px, 1.4vw, 22px);
  top: 50%;
  transform: translateY(-50%);
  z-index: 110;
  display: grid;
  gap: var(--space-3);
}
.section-pager__dot {
  position: relative;
  display: block;
  width: 10px;
  height: 10px;
}
.section-pager__dot::after {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  border: 1px solid var(--c-line-strong);
  background: color-mix(in srgb, var(--c-text) 20%, transparent);
  transition: transform var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}
.section-pager__dot:hover::after { background: var(--c-text-dim); }
.section-pager__dot.is-active::after {
  inset: 0;
  background: var(--c-accent);
  border-color: transparent;
  transform: scale(1);
}
.section-pager__label {
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translate(6px, -50%);
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--c-text-dim);
  background: color-mix(in srgb, var(--c-bg) 88%, transparent);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-line);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.section-pager__dot:hover .section-pager__label,
.section-pager__dot.is-active .section-pager__label {
  opacity: 1;
  transform: translate(0, -50%);
}
@media (max-width: 1180px) { .section-pager { display: none; } }

/* ---- Reduced motion --------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  * , *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .scene-tall, .scene-hero { height: auto; }
  .stage { position: static; height: auto; padding-block: var(--space-9); }
  .trace-step { opacity: 1; transform: none; }
  .hero-scrollcue { display: none; }
  /* Motion layer never hides content when motion is reduced. */
  .sv-anim .section-head,
  .sv-anim .capability,
  .sv-anim .work-card,
  .sv-anim .engage-card,
  .sv-anim .agent-shell,
  .sv-anim .contact-form,
  .sv-anim .trust-row span,
  .sv-anim .mast-copy > *,
  .sv-anim .mast-panel { opacity: 1; }
  .mast-aurora { display: none; }
  .scroll-progress, .section-pager { display: none; }
}

/* ======================================================================== *
 * Classic Studio — the company surface is a calm white field where the
 * opening sentence is the only thing on stage. These rules are intentionally
 * scoped so the research product and library retain their own application
 * behaviours.
 * ======================================================================== */
.brand-mark,
.footer-brand__mark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--c-text);
  font-weight: 600;
  letter-spacing: var(--tracking-snug);
}
.brand-mark img { width: 27px; height: 27px; }
.footer-brand__mark { color: var(--c-on-ink); }
.footer-brand__mark img { width: 30px; height: 30px; filter: invert(1); }

.btn-quiet {
  --btn-bg: transparent;
  border-color: transparent;
  color: var(--c-text);
  box-shadow: none;
}
.btn-quiet:hover { color: var(--c-accent); text-decoration: none; }

.studio-hero {
  background: var(--c-bg-elev);
  padding: clamp(7rem, 12vw, 10rem) 0 clamp(4rem, 8vw, 7rem);
  overflow: clip;
}
.studio-hero__inner { position: relative; z-index: 1; max-width: 54rem; }
.studio-kicker {
  margin: 0 0 var(--space-4);
  color: var(--c-text-dim);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: var(--tracking-snug);
}
.studio-hero h1 {
  max-width: 21ch;
  margin: 0;
  color: var(--c-text);
  font-size: clamp(2.75rem, 6vw, 5.1rem);
  font-weight: 620;
  line-height: 1.02;
  letter-spacing: -.035em;
}
.studio-lead {
  max-width: 47ch;
  margin: var(--space-5) 0 0;
  color: var(--c-text-dim);
  font-size: var(--step-1);
  line-height: var(--leading-normal);
}
.studio-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
}
.studio-hero__aside {
  margin: var(--space-5) 0 0;
  color: var(--c-text-mute);
  font-size: var(--step--1);
}
.studio-hero__aside a { color: var(--c-text); text-decoration: underline; text-underline-offset: 3px; }
.studio-hero__aside a:hover { color: var(--c-accent); }

.studio-statement { padding: clamp(5rem, 10vw, 10rem) 0; }
.studio-statement h2 {
  max-width: 17ch;
  margin: 0 auto;
  color: var(--c-text);
  font-size: clamp(2.4rem, 5.2vw, 5.2rem);
  font-weight: 580;
  line-height: 1.01;
  letter-spacing: -.052em;
  text-align: center;
}
.studio-statement h2 span { display: block; color: var(--c-text-dim); }

.studio-practice,
.studio-work,
.studio-library,
.studio-contact { padding: clamp(4.5rem, 9vw, 8rem) 0; }
.studio-practice { border-top: 1px solid var(--c-line); }
.studio-practice h2,
.studio-work h2,
.studio-depth h2,
.studio-library h2,
.studio-contact h2 {
  max-width: 16ch;
  margin: 0;
  color: inherit;
  font-size: var(--step-3);
  font-weight: 590;
  line-height: 1.04;
  letter-spacing: var(--tracking-tight);
}
.studio-practice__list { margin-top: var(--space-8); }
.studio-practice__item {
  display: grid;
  grid-template-columns: 4rem minmax(10rem, .7fr) minmax(0, 1fr);
  gap: var(--space-6);
  border-top: 1px solid var(--c-line-strong);
  padding: var(--space-6) 0;
}
.studio-practice__item:last-child { border-bottom: 1px solid var(--c-line-strong); }
.studio-practice__item > span {
  color: var(--c-text-mute);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
}
.studio-practice__item h3,
.studio-work__item h3,
.studio-depth h3 {
  margin: 0;
  color: inherit;
  font-size: var(--step-1);
  letter-spacing: var(--tracking-snug);
}
.studio-practice__item p,
.studio-work__item p,
.studio-depth p,
.studio-library p,
.studio-contact p { color: var(--c-text-dim); }
.studio-practice__item p { max-width: 48ch; margin: 0; }

.studio-work { background: var(--c-bg-elev); }
.studio-section-head { display: flex; align-items: end; justify-content: space-between; gap: var(--space-5); }
.studio-section-head > p { max-width: 36ch; margin: 0; }
.studio-work__list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-5); margin-top: var(--space-8); }
.studio-work__item {
  display: grid;
  gap: var(--space-5);
  min-width: 0;
}
.studio-work__item h3 { margin-top: var(--space-3); }
.studio-work__item p { max-width: 41ch; margin: var(--space-3) 0 0; }
.studio-work__item a { display: inline-flex; margin-top: var(--space-4); font-weight: 500; }
.studio-work__item a:hover { text-decoration: none; }
.studio-work__item a span { margin-left: .35em; transition: transform var(--dur-fast) var(--ease-out); }
.studio-work__item a:hover span { transform: translateX(3px); }
.studio-work__visual {
  position: relative;
  min-height: 17rem;
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  background: var(--c-surface);
}
.studio-work__visual span,
.studio-work__visual i { position: absolute; display: block; border-radius: var(--radius-pill); }
.studio-work__visual--research span { left: 11%; right: 11%; height: 1px; background: var(--c-line-strong); }
.studio-work__visual--research span:nth-child(1) { top: 29%; }
.studio-work__visual--research span:nth-child(2) { top: 49%; }
.studio-work__visual--research span:nth-child(3) { top: 69%; }
.studio-work__visual--research i {
  top: 37%; left: 37%; width: 26%; height: 26%;
  border: 1px solid color-mix(in srgb, var(--c-accent) 50%, white);
  background: color-mix(in srgb, var(--c-accent) 8%, white);
  box-shadow: 0 0 0 12px color-mix(in srgb, var(--c-accent) 5%, transparent);
}
.studio-work__visual--platform {
  background: linear-gradient(135deg, #fff 0%, #f6f7fa 100%);
}
.studio-work__visual--platform span { width: 31%; height: 31%; border: 1px solid var(--c-line-strong); background: #fff; }
.studio-work__visual--platform span:nth-child(1) { top: 18%; left: 17%; }
.studio-work__visual--platform span:nth-child(2) { right: 17%; bottom: 18%; }
.studio-work__visual--platform span:nth-child(3) { top: 34%; right: 30%; width: 17%; height: 17%; background: var(--c-accent); border-color: transparent; }
.studio-work__visual--platform i { top: 50%; left: 31%; width: 38%; height: 1px; background: var(--c-line-strong); transform: rotate(39deg); transform-origin: center; }

.studio-depth { padding: clamp(4.5rem, 9vw, 8rem) 0; background: #1d1d1f; color: #f5f5f7; }
.studio-depth .studio-kicker { color: #a1a1a6; }
.studio-depth h2 { max-width: 13ch; }
.studio-depth__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-7); margin-top: var(--space-8); }
.studio-depth__grid article { border-top: 1px solid rgba(245, 245, 247, .22); padding-top: var(--space-5); }
.studio-depth h3 { color: #f5f5f7; }
.studio-depth p { max-width: 40ch; color: #a1a1a6; }

.studio-library { border-bottom: 1px solid var(--c-line); }
.studio-library__grid,
.studio-contact__grid { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: clamp(2rem, 8vw, 9rem); align-items: start; }
.studio-library__grid > div > p:last-child { max-width: 48ch; margin: 0; }
.studio-library__counts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: var(--space-7); border-top: 1px solid var(--c-line-strong); border-bottom: 1px solid var(--c-line-strong); }
.studio-library__counts a { display: grid; gap: var(--space-2); min-height: 10rem; padding: var(--space-5) 0; color: var(--c-text); }
.studio-library__counts a + a { border-left: 1px solid var(--c-line-strong); padding-left: var(--space-5); }
.studio-library__counts a:hover { color: var(--c-accent); text-decoration: none; }
.studio-library__counts strong { font-size: var(--step-4); font-weight: 590; letter-spacing: var(--tracking-tight); }
.studio-library__counts span { max-width: 16ch; color: var(--c-text-dim); font-size: var(--step--1); }

.studio-contact { background: var(--c-bg-elev); }
.studio-contact h2 { max-width: 12ch; }
.studio-contact > .container > div > p:last-child { max-width: 39ch; margin: var(--space-5) 0 0; }
.studio-contact .contact-form { border-radius: var(--radius-lg); box-shadow: none; }
.footer-brand > p { max-width: 28ch; }

@media (max-width: 860px) {
  .studio-library__grid,
  .studio-contact__grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .studio-practice__item,
  .studio-work__list,
  .studio-depth__grid { grid-template-columns: 1fr; }
  .studio-practice__item { gap: var(--space-3); }
  .studio-section-head { display: block; }
  .studio-section-head > p { margin-top: var(--space-4); }
}
@media (max-width: 560px) {
  .studio-hero { padding-top: calc(var(--space-9) + 3rem); }
  .studio-hero h1 { font-size: clamp(2.35rem, 10vw, 3.2rem); max-width: 18ch; }
  .studio-actions { margin-top: var(--space-6); }
  .studio-actions .btn { width: 100%; }
  .studio-work__visual { min-height: 13rem; }
  .studio-library__counts { grid-template-columns: 1fr; }
  .studio-library__counts a { min-height: 0; }
  .studio-library__counts a + a { border-left: 0; border-top: 1px solid var(--c-line-strong); padding-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .studio-hero__inner { animation: none !important; }
}