/* ==========================================================================
   mindunder.dev — main stylesheet
   Order: reset → base → chrome (bar, ask, foot) → landing → session →
   blocks → flow diagrams → motion → responsive.
   ========================================================================== */

/* Reset ------------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
button, input { font: inherit; color: inherit; background: none; border: 0; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
ol, ul { list-style: none; }
svg { display: block; }
img, canvas { display: block; max-width: 100%; }
[hidden] { display: none !important; }

/* Base ------------------------------------------------------------------- */
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--bar-h) + var(--space-6));
  background: var(--bg);
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.5;
  font-feature-settings: 'ss01', 'cv11';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color var(--dur-3) var(--ease-out), color var(--dur-3) var(--ease-out);
}

::selection { background: var(--selection); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-1);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip {
  position: fixed;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  background: var(--fg);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  transform: translateY(-200%);
}
.skip:focus { transform: none; }

.micro {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--step--2);
  letter-spacing: var(--tracking-micro);
  text-transform: uppercase;
  color: var(--fg-3);
}

main { flex: 1; display: flex; flex-direction: column; }

/* Chrome: bar ------------------------------------------------------------ */
.bar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--bar-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 var(--gutter);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-2) var(--ease-out);
}
.is-scrolled .bar,
.is-session .bar { border-bottom-color: var(--line); }

.brand {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) 0;
}
.brand-mark {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: var(--fg);
  stroke-width: 1.5;
  stroke-linecap: round;
  transition: stroke var(--dur-2);
}
.brand-mark circle { transition: transform var(--dur-3) var(--ease-out); transform-origin: 12px 9px; }
.brand:hover .brand-mark circle { transform: translateY(2.5px) scale(0.92); }
.brand-name {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.brand-tld { color: var(--fg-3); }

.bar-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: var(--tracking-micro);
  text-transform: uppercase;
  color: var(--fg-3);
}
.clock { color: var(--fg-2); font-variant-numeric: tabular-nums; }

.pulse {
  position: relative;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-round);
  background: var(--accent);
}
.pulse::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: inherit;
  border: 1px solid var(--accent);
  opacity: 0;
  animation: pulse 2.4s var(--ease-out) 2; /* finite: WCAG 2.2.2 */
}
@keyframes pulse {
  0% { transform: scale(0.4); opacity: 0.9; }
  70%, 100% { transform: scale(1.6); opacity: 0; }
}

.bar-tools { justify-self: end; display: flex; align-items: center; gap: var(--space-1); }
.sound-toggle {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-round);
  color: var(--fg-3);
  transition: color var(--dur-1), background-color var(--dur-1);
}
.sound-toggle:hover { color: var(--fg); background: var(--bg-sunken); }
.sound-toggle svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.sound-toggle .snd-wave { opacity: 0; transform: scale(0.6); transform-origin: 12px 12px; transition: opacity var(--dur-2), transform var(--dur-3) var(--ease-spring); }
.sound-toggle .snd-off { transition: opacity var(--dur-2); }
.sound-toggle[aria-pressed='true'] { color: var(--accent); }
.sound-toggle[aria-pressed='true'] .snd-wave { opacity: 1; transform: none; }
.sound-toggle[aria-pressed='true'] .snd-off { opacity: 0; }
.theme-toggle {
  justify-self: end;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin-right: -8px;
  border-radius: var(--radius-round);
  color: var(--fg-2);
  transition: color var(--dur-1), background-color var(--dur-1);
}
.theme-toggle:hover { color: var(--fg); background: var(--bg-sunken); }
.theme-toggle svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.theme-toggle-fill {
  fill: currentColor;
  stroke: none;
  transform-origin: 12px 12px;
  transition: transform var(--dur-3) var(--ease-out);
}
[data-theme='dark'] .theme-toggle-fill { transform: rotate(180deg); }

/* Chrome: ask (command bar) ---------------------------------------------- */
.ask {
  position: fixed;
  z-index: 30;
  left: 50%;
  bottom: max(var(--space-4), env(safe-area-inset-bottom));
  width: min(46rem, calc(100% - 2 * var(--gutter)));
  height: 3.25rem;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-2) 0 var(--space-4);
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-2);
  box-shadow: var(--shadow);
  transition: border-color var(--dur-2), box-shadow var(--dur-2), background-color var(--dur-3);
}
.ask:focus-within { border-color: var(--line-2); }
.ask-prompt {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: var(--step--1);
  user-select: none;
}
.ask-input {
  flex: 1;
  min-width: 0;
  height: 100%;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--fg);
  caret-color: var(--accent);
  outline: none;
}
.ask-input::placeholder { color: var(--fg-3); opacity: 1; }
.ask-input:disabled { opacity: 0.5; }
.ask-hint {
  display: grid;
  place-items: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  color: var(--fg-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-1);
  transition: opacity var(--dur-1);
}
.ask:focus-within .ask-hint { opacity: 0; }
.ask-send {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-1);
  color: var(--fg-3);
  transition: color var(--dur-1), background-color var(--dur-1), transform var(--dur-2) var(--ease-out);
}
.ask-send svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.ask.has-value .ask-send { color: var(--on-accent); background: var(--accent); }
.ask.has-value .ask-send:hover { transform: translateX(2px); }

/* Chrome: foot ----------------------------------------------------------- */
.foot {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--gutter) calc(3.25rem + var(--space-4) * 2 + env(safe-area-inset-bottom));
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.04em;
  color: var(--fg-3);
}
.is-landing .foot { display: none; }
.foot-link { color: var(--fg-2); border-bottom: 1px solid var(--line-2); }
.foot-link:hover { color: var(--accent); border-color: var(--accent); }

/* Landing ---------------------------------------------------------------- */
.landing { transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out); }
/* Screen one: the headline and the lens, nothing else. */
.landing-hero {
  position: relative;
  isolation: isolate;
  min-height: calc(100svh - var(--bar-h));
  display: grid;
  align-items: end;
  padding: var(--space-8) var(--gutter) var(--space-9);
  overflow: hidden;
}
.landing.is-leaving { opacity: 0; transform: translateY(-24px); pointer-events: none; }

.lens {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  touch-action: pan-y;
}

.landing-inner {
  position: relative;
  max-width: 78rem;
  width: 100%;
  margin: 0 auto;
  pointer-events: none;
}
.landing-inner a, .landing-inner button { pointer-events: auto; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--step--2);
  letter-spacing: var(--tracking-micro);
  text-transform: uppercase;
  color: var(--fg-2);
}
.eyebrow-rule { width: 2.5rem; height: 1px; background: currentColor; }

.display {
  font-family: var(--font-display);
  font-weight: var(--weight-display);
  font-size: var(--step-display);
  line-height: 0.92;
  letter-spacing: var(--tracking-display);
  color: var(--fg);
  text-wrap: balance;
}
.display-line { display: block; }
/* The second line is the promise, spoken rather than built. */
.display-line + .display-line { max-width: 22ch; margin-top: 0.35em; font: italic 300 0.52em/1.12 var(--font-voice); letter-spacing: -0.015em; color: var(--fg-2); }
.display em { font-style: normal; }
.display .is-accent { color: var(--accent); }

.lede {
  max-width: 36rem;
  margin-top: var(--space-5);
  font-size: var(--step-2);
  line-height: 1.35;
  color: var(--fg-2);
  text-wrap: pretty;
}

.entry {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: var(--space-6);
  max-width: 52rem;
  margin-top: var(--space-7);
}
.entry-item {
  position: relative;
  display: grid;
  grid-template-columns: 2.5rem 1fr auto;
  align-items: baseline;
  padding: var(--space-4) 0;
  border-top: 1px solid var(--line-2);
  font-size: var(--step-1);
  color: var(--fg);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  isolation: isolate;
  transition: color var(--dur-1);
}
/* Spotlight that follows the pointer along the row. */
.entry-item::before {
  content: '';
  position: absolute;
  inset: 0 calc(var(--space-3) * -1);
  z-index: -1;
  background: radial-gradient(14rem circle at var(--mx, 50%) 50%, var(--accent-soft), transparent 70%);
  opacity: 0;
  transition: opacity var(--dur-3) var(--ease-out);
}
.entry-item:hover::before { opacity: 1; }
.entry-item::after {
  content: '';
  position: absolute;
  left: 0;
  top: -1px;
  height: 1px;
  width: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-3) var(--ease-out);
}
.entry-item:hover::after, .entry-item:focus-visible::after { transform: scaleX(1); }
.entry-index { font-family: var(--font-mono); font-size: var(--step--2); color: var(--fg-3); transition: color var(--dur-1); }
.entry-item:hover .entry-index { color: var(--accent); }
.entry-arrow { color: var(--fg-3); transition: transform var(--dur-2) var(--ease-out), color var(--dur-1); }
.entry-item:hover .entry-arrow { transform: translateX(4px); color: var(--accent); }
/* Label: an accent wipe runs through the words on hover. */
.entry-label {
  background: linear-gradient(90deg, var(--accent) 0 50%, var(--fg) 50% 100%) 100% 0 / 200% 100% no-repeat;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: background-position 700ms var(--ease-out), transform 700ms var(--ease-out);
}
.entry-item:hover .entry-label, .entry-item:focus-visible .entry-label { background-position: 0 0; transform: translateX(6px); }
@media (forced-colors: active) { .entry-label { -webkit-text-fill-color: CanvasText; background: none; } }

.lens-caption {
  position: absolute;
  right: var(--gutter);
  top: var(--space-6);
  display: flex;
  gap: var(--space-3);
  max-width: 20rem;
  text-wrap: balance;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  line-height: 1.5;
  color: var(--fg-3);
  pointer-events: none;
}
.lens-caption-fig { flex: none; color: var(--fg-2); }
.lens-caption.is-found .lens-caption-fig,
.lens-caption.is-found .lens-caption-text { color: var(--accent); }
.lens-caption-text { transition: color var(--dur-2); }

/* Landing intro cascade — only when JS is present */
.js .landing .eyebrow,
.js .landing .display-line,
.js .landing .lens-caption,
.js .landing .land-cue {
  animation: rise var(--dur-4) var(--ease-out) backwards;
}
.js .landing .eyebrow { animation-delay: 80ms; }
.js .landing .display-line:nth-child(1) { animation-delay: 160ms; }
.js .landing .display-line:nth-child(2) { animation-delay: 300ms; }
.js .landing .lens-caption { animation-delay: 2200ms; }
.js .landing .land-cue { animation-delay: 1300ms; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } }

/* Word masks: each word rises out of its own clip. */
.sw { display: inline-block; clip-path: inset(-0.3em -0.25em -0.14em -0.25em); }
.sw-in { display: inline-block; }
.js .landing .display.is-split .display-line { opacity: 1; transform: none; animation: none; }
.js .landing .display.is-split .sw-in {
  opacity: 0;
  transform: translateY(125%) rotate(5deg);
  transform-origin: 0 100%;
  animation: word-rise 0.8s var(--ease-out) forwards;
  animation-delay: calc(80ms + var(--i) * 36ms);
}
@keyframes word-rise { 40% { opacity: 1; } to { opacity: 1; transform: none; } }

/* Fixing: everything but the chosen question recedes while the graph straightens. */
.landing .copy, .landing .xray, .landing .entry-item, .landing .lens-caption { transition: opacity 520ms var(--ease-out); }
.landing.is-fixing :is(.copy, .xray, .lens-caption, .entry-item:not(.is-chosen)) { opacity: 0.12; }
.landing.is-fixing .entry-item.is-chosen .entry-label { background-position: 0 0; transform: translateX(6px); }
.landing.is-fixing .entry-item.is-chosen::after { transform: scaleX(1); }

/* The lens on the landing is also the cursor's scope. */
.js .landing { cursor: crosshair; }
.js .landing a, .js .landing button { cursor: pointer; }

/* X-ray: a hole in the real copy where the lens is, and an outline copy with
   construction lines showing through it. Coordinates come from lens.js. */
.copy { position: relative; }
.js .copy {
  -webkit-mask-image: radial-gradient(circle at var(--lx, -9999px) var(--ly, -9999px), transparent calc(var(--lr, 0px) - 0.5px), #000 calc(var(--lr, 0px) + 0.5px));
  mask-image: radial-gradient(circle at var(--lx, -9999px) var(--ly, -9999px), transparent calc(var(--lr, 0px) - 0.5px), #000 calc(var(--lr, 0px) + 0.5px));
}
.xray {
  position: absolute;
  inset: 0 0 auto 0;
  pointer-events: none;
  user-select: none;
  clip-path: circle(var(--lr, 0px) at var(--lx, -9999px) var(--ly, -9999px));
}
.xray .display, .xray .display * { color: transparent; -webkit-text-stroke: 1px var(--accent); }
.xray .display .is-accent { -webkit-text-stroke-width: 1.5px; }
.xray .eyebrow, .xray .lede { color: transparent; -webkit-text-stroke: 0.6px var(--fg-2); }
.xray .eyebrow-rule { background: var(--accent); }
.xray .display-line { position: relative; }
.xray .guide {
  position: absolute;
  height: 0;
  border-top: 1px dashed var(--accent-line);
  -webkit-text-stroke: 0;
}
.xray .guide.is-baseline { border-top: 1px solid var(--accent); }
.xray .guide-label {
  position: absolute;
  left: clamp(0px, calc(var(--lx, 0px) - var(--lr, 0px) * 0.62 - var(--gl, 0px)), calc(100% - 9em));
  top: -1.35em;
  font: 400 9.5px/1 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--accent);
  -webkit-text-stroke: 0;
  font-style: normal;
  opacity: 0;
  transition: opacity var(--dur-2);
}
.xray .guide.is-labelled .guide-label { opacity: 1; }

/* Session ---------------------------------------------------------------- */
.session {
  display: grid;
  grid-template-columns: 14rem minmax(0, 46rem);
  justify-content: center;
  column-gap: clamp(var(--space-6), 5vw, var(--space-9));
  padding: var(--space-7) var(--gutter) var(--space-7);
  animation: fade-in var(--dur-3) var(--ease-out);
}
@keyframes fade-in { from { opacity: 0; } }

.rail {
  position: sticky;
  top: calc(var(--bar-h) + var(--space-7));
  align-self: start;
  display: grid;
  gap: var(--space-6);
  max-height: calc(100dvh - var(--bar-h) - var(--space-9) - 3.25rem);
  overflow-y: auto;
  scrollbar-width: none;
}
.rail::-webkit-scrollbar { display: none; }
.rail-heading {
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 400;
  letter-spacing: var(--tracking-micro);
  text-transform: uppercase;
  color: var(--fg-3);
}

.trail { display: grid; counter-reset: trail; }
.trail-item { counter-increment: trail; }
.trail-link {
  position: relative;
  display: grid;
  grid-template-columns: 1.75rem 1fr;
  width: 100%;
  padding: 0.3rem 0;
  text-align: left;
  font-size: var(--step--1);
  color: var(--fg-2);
  transition: color var(--dur-1);
}
.trail-link::before {
  content: counter(trail, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  line-height: 1.8;
  color: var(--fg-3);
}
.trail-link:hover { color: var(--fg); }
.trail-link[aria-current='step'] { color: var(--fg); }
.trail-link[aria-current='step']::before { color: var(--accent); }
.trail-link[aria-current='step']::after {
  content: '';
  position: absolute;
  left: -0.875rem;
  top: 50%;
  width: 5px;
  height: 5px;
  margin-top: -2.5px;
  border-radius: var(--radius-round);
  background: var(--accent);
}

.depth-track { display: grid; grid-template-columns: repeat(4, 1fr); gap: 3px; }
.depth-track i {
  height: 3px;
  background: var(--line-2);
  transition: background-color var(--dur-3) var(--ease-out);
}
.depth[data-level='0'] .depth-track i:nth-child(-n+1),
.depth[data-level='1'] .depth-track i:nth-child(-n+2),
.depth[data-level='2'] .depth-track i:nth-child(-n+3),
.depth[data-level='3'] .depth-track i { background: var(--accent); }
.depth-label { margin-top: var(--space-2); font-size: var(--step--1); color: var(--fg-2); }

.rail-actions { display: grid; gap: var(--space-3); justify-items: start; }
.rail-brief {
  display: inline-flex;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--step--1);
  text-align: left;
  color: var(--fg);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-1);
  transition: border-color var(--dur-1), color var(--dur-1), background-color var(--dur-1);
}
.rail-brief:hover { border-color: var(--accent); color: var(--accent); }
.rail-mail {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  color: var(--fg-3);
  border-bottom: 1px solid var(--line-2);
  transition: color var(--dur-1), border-color var(--dur-1);
}
.rail-mail:hover { color: var(--accent); border-color: var(--accent); }

/* Log -------------------------------------------------------------------- */
.log { display: grid; gap: var(--space-8); min-width: 0; }

.turn { display: grid; align-content: start; gap: var(--space-5); min-width: 0; scroll-margin-top: calc(var(--bar-h) + var(--space-6)); }
.turn + .turn { padding-top: var(--space-8); border-top: 1px solid var(--line); margin-top: calc(var(--space-8) * -1 + var(--space-2)); }

.turn:last-child { min-height: calc(100dvh - var(--bar-h) - 3.25rem - var(--space-9)); }

.turn-q { display: grid; gap: var(--space-2); }
.turn-index { font-family: var(--font-mono); font-size: var(--step--2); letter-spacing: var(--tracking-micro); color: var(--fg-3); }
.turn-index b { font-weight: 400; color: var(--accent); }
.turn-question {
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 750;
  line-height: 1.04;
  letter-spacing: var(--tracking-display);
  color: var(--fg);
  text-wrap: balance;
}
.turn-question.is-quoted::before { content: '“'; color: var(--fg-3); }
.turn-question.is-quoted::after { content: '”'; color: var(--fg-3); }

.turn-a { display: grid; align-content: start; gap: var(--space-5); min-width: 0; }

.turn.is-aside { gap: var(--space-4); padding: var(--space-5) 0 0 var(--space-5); border-left: 1px solid var(--accent-line); border-top: 0; margin-top: calc(var(--space-6) * -1); }
.turn.is-aside .turn-question { font-size: var(--step-2); }

/* Compiling: a scan runs along a hairline while the answer is prepared. */
.scan { display: grid; gap: var(--space-2); max-width: var(--measure); }
.scan-track { position: relative; height: 1px; overflow: hidden; background: var(--line); }
.scan-track i {
  position: absolute;
  inset: 0 auto 0 0;
  width: 35%;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: scan 1.1s var(--ease-in-out) infinite;
}
@keyframes scan { from { transform: translateX(-100%); } to { transform: translateX(300%); } }

.thinking {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: var(--tracking-micro);
  text-transform: uppercase;
  color: var(--fg-3);
}
.thinking-dots { display: inline-flex; gap: 4px; }
.thinking-dots i { width: 4px; height: 4px; border-radius: var(--radius-round); background: var(--accent); animation: blink 1s var(--ease-in-out) infinite; }
.thinking-dots i:nth-child(2) { animation-delay: 0.15s; }
.thinking-dots i:nth-child(3) { animation-delay: 0.3s; }
@keyframes blink { 0%, 100% { opacity: 0.25; } 50% { opacity: 1; } }

/* Chips — next questions --------------------------------------------------- */
.chips { display: grid; margin-top: var(--space-3); border-bottom: 1px solid var(--line); }
.chips-heading { margin-bottom: var(--space-2); }
.chip {
  position: relative;
  isolation: isolate;
  animation: chip-in 700ms var(--ease-out) backwards;
  animation-delay: calc(var(--i, 0) * 70ms + 60ms);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: var(--space-4);
  width: 100%;
  padding: 0.8rem 0;
  text-align: left;
  font-size: var(--step-0);
  color: var(--fg);
  border-top: 1px solid var(--line);
  transition: color var(--dur-1), padding var(--dur-2) var(--ease-out);
}
.chip-label { display: inline-flex; align-items: center; gap: var(--space-3); }
.chip-arrow { color: var(--fg-3); transition: transform var(--dur-2) var(--ease-out), color var(--dur-1); }
.chip:hover { color: var(--accent); }
/* A soft wash sweeps in under the row on hover. */
.chip::after {
  content: '';
  position: absolute;
  inset: 0 calc(var(--space-3) * -1);
  z-index: -1;
  background: linear-gradient(90deg, var(--accent-soft), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 600ms var(--ease-out);
}
.chip:hover::after, .chip:focus-visible::after { transform: scaleX(1); }
.chip.is-primary::after { display: none; }
@keyframes chip-in { from { opacity: 0; transform: translateY(10px); } }
.chip:hover .chip-arrow { color: var(--accent); }
.chip:hover .chip-arrow { transform: translateX(4px); }
.chip.is-engage { color: var(--accent); isolation: isolate; }
.chip.is-engage .chip-arrow { color: var(--accent); }
.chip.is-engage::before {
  content: '';
  position: absolute;
  inset: 0 calc(var(--space-3) * -1);
  background: var(--accent-soft);
  z-index: -1;
  border-radius: var(--radius-1);
}
.chip.is-primary {
  justify-self: start;
  display: inline-flex;
  width: auto;
  gap: var(--space-3);
  margin: var(--space-3) 0;
  padding: 0.8rem 1.1rem;
  border: 0;
  border-radius: var(--radius-2);
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 500;
}
.chip.is-primary .chip-arrow { color: inherit; }
.chip.is-primary:hover { color: var(--on-accent); filter: brightness(1.06); }

/* Blocks ------------------------------------------------------------------ */
.b-text {
  max-width: var(--measure);
  font-size: var(--step-1);
  line-height: 1.62;
  color: var(--fg);
  text-wrap: pretty;
}
.b-text + .b-text { margin-top: calc(var(--space-2) * -1); }
.b-text .w { display: inline-block; white-space: pre; }

.b-hero-title {
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: var(--weight-display);
  line-height: 0.96;
  letter-spacing: var(--tracking-display);
  text-wrap: balance;
}
.b-hero-title em { font-style: normal; color: var(--accent); }
.b-hero-sub { margin-top: var(--space-3); font-family: var(--font-mono); font-size: var(--step--1); color: var(--fg-3); }

.b-callout {
  position: relative;
  max-width: var(--measure);
  padding: var(--space-1) 0 var(--space-1) var(--space-5);
  font-family: var(--font-voice);
  font-style: italic;
  font-weight: 300;
  font-size: var(--step-2);
  line-height: 1.28;
  color: var(--fg);
  text-wrap: pretty;
}
.b-callout::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.35em;
  bottom: 0.35em;
  width: 2px;
  background: var(--accent);
}
.b-callout cite { display: block; margin-top: var(--space-3); font-family: var(--font-mono); font-style: normal; font-size: var(--step--2); color: var(--fg-3); }

.b-split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-5) var(--space-6); align-items: start; }
.b-split > div { display: grid; gap: var(--space-4); align-content: start; }
.b-split .b-text { font-size: var(--step-0); }

.b-metric-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7.5rem, 1fr));
  border-top: 1px solid var(--line-2);
}
.b-metric-row > div { padding: var(--space-4) var(--space-4) 0 0; }
.b-metric-row > div + div { padding-left: var(--space-4); border-left: 1px solid var(--line); }
.b-metric-value,
.b-metric-big {
  display: block;
  font-family: var(--font-display);
  font-weight: var(--weight-display);
  font-size: var(--step-4);
  line-height: 1;
  letter-spacing: var(--tracking-display);
  font-variant-numeric: tabular-nums lining-nums;
}
.b-metric-label { display: block; margin-top: var(--space-2); font-size: var(--step--1); line-height: 1.4; color: var(--fg-2); text-wrap: balance; }
.b-metric-sub { display: block; margin-top: var(--space-1); font-size: var(--step--1); color: var(--fg-2); }

.b-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); border-top: 1px solid var(--line-2); }
.b-stats > div { display: grid; gap: var(--space-1); padding: var(--space-3) var(--space-4) var(--space-3) 0; border-bottom: 1px solid var(--line); }
.b-stats dd { font-size: var(--step-0); color: var(--fg); }

.b-pills-list { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-2); }
.b-pill {
  padding: 0.3rem 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.02em;
  color: var(--fg-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-round);
}

.b-badge {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.35rem 0.7rem 0.35rem 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.04em;
  color: var(--fg-2);
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-round);
}
.b-badge.is-active .pulse { width: 5px; height: 5px; }

.b-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
.b-grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.b-card {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--space-3);
  min-height: 11rem;
  padding: var(--space-4);
  text-align: left;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-2);
  transition: border-color var(--dur-2), transform var(--dur-3) var(--ease-out), box-shadow var(--dur-3) var(--ease-out);
}
.b-card {
  transform: perspective(800px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
  transform-style: preserve-3d;
}
.b-card:hover { border-color: var(--line-2); transform: perspective(800px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)) translateY(-3px); box-shadow: var(--shadow); }
/* Glare that follows the pointer. */
.b-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(18rem circle at var(--gx, 50%) var(--gy, 0%), var(--accent-soft), transparent 60%);
  opacity: 0;
  transition: opacity var(--dur-3) var(--ease-out);
}
.b-card:hover::before { opacity: 1; }
.b-card-head { display: flex; justify-content: space-between; align-items: center; gap: var(--space-2); }
.b-card-title { font-family: var(--font-mono); font-size: var(--step--2); letter-spacing: var(--tracking-micro); text-transform: uppercase; color: var(--fg); }
.b-card-status { display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: var(--step--2); color: var(--fg-3); }
.b-card-status .pulse { width: 5px; height: 5px; }
.b-card-desc { font-size: var(--step--1); line-height: 1.5; color: var(--fg-2); }
.b-card-desc.is-quote { font-family: var(--font-voice); font-style: italic; font-weight: 300; font-size: var(--step-1); line-height: 1.3; color: var(--fg); }
.b-card-go { justify-self: end; color: var(--fg-3); transition: transform var(--dur-2) var(--ease-out), color var(--dur-1); }
.b-card:hover .b-card-go { color: var(--accent); transform: translateX(3px); }

.b-layers { display: grid; counter-reset: layer; }
.b-layer {
  position: relative;
  display: grid;
  grid-template-columns: minmax(3rem, max-content) 1fr;
  gap: 0 var(--space-4);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--line);
}
.b-layer:last-child { border-bottom: 1px solid var(--line); }
.b-layer-label {
  white-space: nowrap;
  grid-row: span 2;
  align-self: start;
  justify-self: start;
  padding: 0.15rem 0.45rem;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  color: var(--fg-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-1);
}
.b-layer:first-child .b-layer-label { color: var(--accent); border-color: var(--accent-line); }
.b-layer-title { font-size: var(--step-0); font-weight: 500; }
.b-layer-detail { margin-top: 2px; font-size: var(--step--1); color: var(--fg-2); }
.b-layers.is-steps .b-layer:first-child .b-layer-label { color: var(--fg-2); border-color: var(--line-2); }
.b-layers.is-steps .b-layer-label { border-radius: var(--radius-round); min-width: 1.6rem; text-align: center; }

.b-table-wrap { overflow-x: auto; border-top: 1px solid var(--line-2); }
.b-table { width: 100%; border-collapse: collapse; font-size: var(--step--1); }
.b-table th {
  padding: var(--space-3) var(--space-4) var(--space-3) 0;
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 400;
  letter-spacing: var(--tracking-micro);
  text-transform: uppercase;
  color: var(--fg-3);
  border-bottom: 1px solid var(--line);
}
.b-table td { padding: var(--space-3) var(--space-4) var(--space-3) 0; vertical-align: top; border-bottom: 1px solid var(--line); color: var(--fg-2); }
.b-table td:first-child { color: var(--fg); }
.b-table td:last-child { font-family: var(--font-mono); white-space: nowrap; }

.b-code {
  position: relative;
  overflow: hidden;
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-radius: var(--radius-2);
}
.b-code-lang { display: block; padding: var(--space-2) var(--space-4); border-bottom: 1px solid var(--line); }
.b-code pre {
  overflow-x: auto;
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--fg-2);
  tab-size: 2;
}

.b-progress-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: var(--space-2); }
.b-progress-count { font-family: var(--font-mono); font-size: var(--step--1); color: var(--fg); }
.b-progress-track { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 4px; }
.b-progress-track i { height: 6px; background: var(--line); border-radius: 1px; }
.b-progress-track i.is-on { background: var(--accent); }
.b-progress-track i.is-next { background: repeating-linear-gradient(-45deg, var(--accent-line) 0 3px, transparent 3px 6px); }
.b-progress-sub { margin-top: var(--space-2); font-size: var(--step--1); color: var(--fg-2); }

.b-brief {
  position: relative;
  padding: var(--space-5);
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-2);
  box-shadow: var(--shadow);
}
.b-brief::before {
  content: '';
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: var(--accent);
  border-radius: var(--radius-2) var(--radius-2) 0 0;
}
.b-brief-head { display: flex; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-4); }
.b-brief dl { display: grid; }
.b-brief dl > div { display: grid; grid-template-columns: 7rem 1fr; gap: var(--space-4); padding: var(--space-3) 0; border-top: 1px solid var(--line); }
.b-brief dd { font-size: var(--step--1); color: var(--fg); overflow-wrap: anywhere; }

.b-compose { display: grid; gap: var(--space-4); }
.b-compose-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.8rem 1.1rem;
  font-size: var(--step-0);
  font-weight: 500;
  border-radius: var(--radius-2);
  transition: filter var(--dur-1), border-color var(--dur-1), color var(--dur-1), transform var(--dur-2) var(--ease-out);
}
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { filter: brightness(1.06); }
.btn-primary:active { transform: translateY(1px); }
.btn-ghost { color: var(--fg); border: 1px solid var(--line-2); font-weight: 400; }
.btn-ghost:hover { border-color: var(--fg-3); }
.b-compose-note { font-size: var(--step--1); color: var(--fg-2); max-width: var(--measure); }

/* Flow diagrams ------------------------------------------------------------ */
.b-flow { min-width: 0; }
.b-flow-title { display: block; margin-bottom: var(--space-3); }
.b-flow-canvas { width: 100%; overflow: visible; }
.b-flow svg { width: 100%; height: auto; overflow: visible; }

.fl-node rect { fill: var(--bg-raised); stroke: var(--line-2); stroke-width: 1; }
.fl-node.is-accent rect { fill: var(--accent-soft); stroke: var(--accent); }
.fl-node.is-muted rect { fill: transparent; stroke: var(--line-2); stroke-dasharray: 3 3; }
.fl-label { font-family: var(--font-mono); font-size: 11px; fill: var(--fg); letter-spacing: 0.02em; }
.fl-node.is-accent .fl-label { fill: var(--accent); }
.fl-node.is-muted .fl-label { fill: var(--fg-3); }
.fl-sub { font-family: var(--font-mono); font-size: 9.5px; fill: var(--fg-3); }
.fl-edge { fill: none; stroke: var(--fg-3); stroke-width: 1; }
.fl-edge.is-loop { stroke-dasharray: 2 4; stroke: var(--accent-line); }
.fl-head { fill: var(--fg-3); }
.fl-head.is-loop { fill: var(--accent); }
.fl-edge-label { font-family: var(--font-mono); font-size: 9.5px; fill: var(--fg-3); }
.fl-edge-label-bg { fill: var(--bg); }
.fl-loop-label { fill: var(--accent); }
.fl-spark { fill: var(--accent); }

/* Flow draw-in */
.b-flow .fl-node {
  opacity: 0;
  transform: translateY(8px) scale(0.84);
  transform-box: fill-box;
  transform-origin: center;
  transition: opacity 400ms var(--ease-out), transform 900ms var(--ease-spring);
}
.b-flow .fl-edge { stroke-dasharray: var(--len) var(--len); stroke-dashoffset: var(--len); transition: stroke-dashoffset var(--dur-4) var(--ease-in-out); }
.b-flow .fl-edge.is-loop { stroke-dasharray: 2 4; stroke-dashoffset: 0; opacity: 0; transition: opacity var(--dur-4); }
.b-flow .fl-head, .b-flow .fl-edge-label, .b-flow .fl-edge-label-bg, .b-flow .fl-spark { opacity: 0; transition: opacity var(--dur-3); }
.b-flow.is-drawn .fl-node { opacity: 1; transform: none; }
.b-flow.is-drawn .fl-edge { stroke-dashoffset: 0; }
.b-flow.is-drawn .fl-edge.is-loop,
.b-flow.is-drawn .fl-head,
.b-flow.is-drawn .fl-edge-label,
.b-flow.is-drawn .fl-edge-label-bg { opacity: 1; }
.b-flow.is-drawn .fl-spark { opacity: 1; transition-delay: 1.2s; }

/* Reveal ------------------------------------------------------------------ */
.reveal { opacity: 0; transform: translateY(18px); clip-path: inset(0 -3rem 100% -3rem); }
.reveal.is-in {
  opacity: 1;
  transform: none;
  clip-path: inset(-3rem -3rem -3rem -3rem);
  transition: opacity 500ms var(--ease-out), transform 800ms var(--ease-out), clip-path 900ms var(--ease-out);
}
.b-text .w { opacity: 0; transform: translateY(0.35em); }
/* The one-page view has no word-by-word reveal: its blocks rise as they scroll in. */
.page .b-text .w { opacity: 1; transform: none; }
.is-in .w, .b-text.is-in .w { opacity: 1; transform: none; transition: opacity 360ms var(--ease-out), transform 360ms var(--ease-out); transition-delay: calc(var(--i) * 14ms); }

/* Noscript ---------------------------------------------------------------- */
html:not(.js) :is(.ask, .bar-status, .theme-toggle, .lens-caption) { display: none; }
html:not(.js) .landing-steps { padding-bottom: var(--space-8); }
.noscript { display: grid; gap: var(--space-4); max-width: var(--measure); margin: 0 auto; padding: var(--space-7) var(--gutter); font-size: var(--step-1); }
.noscript a { color: var(--accent); border-bottom: 1px solid currentColor; }

/* Responsive -------------------------------------------------------------- */
@media (max-width: 1080px) {
  .session { grid-template-columns: minmax(0, 46rem); padding-top: 0; }
  .rail {
    position: sticky;
    top: var(--bar-h);
    z-index: 10;
    display: flex;
    align-items: center;
    gap: var(--space-4);
    max-height: none;
    margin: 0 calc(var(--gutter) * -1) var(--space-6);
    padding: var(--space-2) var(--gutter);
    overflow: visible;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
  }
  .rail-block:not(:first-child) { display: none; }
  .rail-block:first-child { display: flex; align-items: center; gap: var(--space-4); flex: 1; min-width: 0; }
  .rail-heading { display: none; }
  .trail { position: relative; display: flex; flex: 1; min-width: 0; gap: var(--space-4); white-space: nowrap; overflow-x: auto; scrollbar-width: none; }
  .trail::-webkit-scrollbar { display: none; }
  .rail .rail-map-toggle { display: inline-flex; }
  /* The map opens as a panel under the strip. */
  .rail.is-map-open .rail-map {
    display: block;
    position: absolute;
    top: calc(100% + var(--space-2));
    right: var(--gutter);
    width: min(19rem, calc(100% - var(--gutter) * 2));
    padding: var(--space-4);
    background: var(--bg-raised);
    border: 1px solid var(--line);
    border-radius: var(--radius-2);
    box-shadow: var(--shadow);
    animation: rise-in 400ms var(--ease-out);
  }
  .trail-link { display: inline-flex; gap: var(--space-2); width: auto; }
  .trail-link[aria-current='step']::after { display: none; }
}

@media (max-width: 720px) {
  :root { --bar-h: 3.25rem; }
  .bar-status { display: none; }
  .bar { grid-template-columns: 1fr auto; }
  .landing-hero { padding-top: var(--space-6); padding-bottom: var(--space-7); align-items: end; }
  .display { line-height: 0.98; }
  .lede { font-size: var(--step-1); }
  .entry { grid-template-columns: 1fr; margin-top: var(--space-6); }
  .entry-item { padding: 0.85rem 0; font-size: var(--step-0); }
  .lens-caption { left: var(--gutter); right: auto; top: var(--space-4); }
  .b-split { grid-template-columns: 1fr; }
  .b-grid, .b-grid.cols-3 { grid-template-columns: 1fr; }
  .b-card { min-height: 0; grid-template-rows: auto auto; }
  .b-card-go { position: absolute; right: var(--space-4); bottom: var(--space-4); }
  .b-card-desc { padding-right: var(--space-5); }
  .b-brief dl > div { grid-template-columns: 1fr; gap: var(--space-1); }
  .turn.is-aside { padding-left: var(--space-4); }
  .ask-hint { display: none; }
  .log { gap: var(--space-7); }
  .turn + .turn { padding-top: var(--space-7); margin-top: calc(var(--space-7) * -1 + var(--space-2)); }
}

@media (max-height: 640px) and (min-width: 721px) {
  .entry { margin-top: var(--space-5); }
  .lede { margin-top: var(--space-4); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-delay: 0ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; transition-delay: 0ms !important; }
  .js .landing .eyebrow, .js .landing .display-line, .js .landing .lede, .js .landing .entry-item, .js .landing .lens-caption { opacity: 1; transform: none; }
  .reveal, .b-text .w { opacity: 1; transform: none; }
  .fl-spark { display: none; }
}

@media (forced-colors: active) {
  .fl-node rect, .b-card, .ask { border: 1px solid CanvasText; }
  .pulse { background: Highlight; }
}

@media print {
  .bar, .ask, .rail, .lens, .lens-caption, .chips { display: none !important; }
  .session { display: block; padding: 0; }
  .reveal, .b-text .w, .b-flow .fl-node { opacity: 1 !important; transform: none !important; }
}

/* View transition: theme switch is a circle from the toggle (see main.js). */
.is-theming::view-transition-old(root),
.is-theming::view-transition-new(root) { animation: none; mix-blend-mode: normal; }

/* View transition: landing → session ------------------------------------ */
::view-transition-old(root),
::view-transition-new(root) { animation-duration: 360ms; animation-timing-function: var(--ease-out); }
::view-transition-group(mu-question) { animation-duration: 620ms; animation-timing-function: var(--ease-out); }
::view-transition-old(mu-question),
::view-transition-new(mu-question) { height: 100%; width: auto; object-fit: contain; object-position: left center; }

/* The flying question (see fly() in app.js). */
.fly { position: fixed; z-index: 35; pointer-events: none; will-change: transform; }
.fly-from { position: absolute; left: 0; top: 0; white-space: nowrap; transform-origin: 0 0; }
.fly-to { display: block; margin: 0; transform-origin: 0 0; }

/* Session question headings rise word by word when they don't fly in. */
.turn-question.is-split .sw-in { animation: word-rise 900ms var(--ease-out) backwards; animation-delay: calc(var(--i) * 45ms); opacity: 1; }
.turn-question.is-split .sw-in { animation-name: q-rise; }
@keyframes q-rise { from { opacity: 0; transform: translateY(110%) rotate(3deg); } }

/* Reading progress: a hairline under the bar, driven by scroll where supported. */
@supports (animation-timeline: scroll()) {
  .is-session .bar::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 1px;
    background: var(--accent);
    transform-origin: left;
    animation: read-progress linear both;
    animation-timeline: scroll(root);
  }
  @keyframes read-progress { from { transform: scaleX(0); } to { transform: scaleX(1); } }
}

/* Staggers: parts of a block arrive in sequence once the block is revealed. */
.is-in .b-card { animation: rise-in 700ms var(--ease-out) backwards; animation-delay: calc(var(--i, 0) * 90ms + 80ms); }
.is-in .b-layer { animation: slide-in 650ms var(--ease-out) backwards; animation-delay: calc(var(--i, 0) * 80ms + 60ms); }
.is-in .b-pill { animation: pop-in 500ms var(--ease-out) backwards; animation-delay: calc(var(--i, 0) * 45ms + 80ms); }
.is-in .b-brief dl > div { animation: rise-in 500ms var(--ease-out) backwards; animation-delay: calc(var(--i, 0) * 90ms + 200ms); }
.is-in .b-progress-track i.is-on { transform-origin: left; animation: fill-in 700ms var(--ease-out) backwards; animation-delay: calc(var(--i, 0) * 240ms + 200ms); }
@keyframes rise-in { from { opacity: 0; transform: translateY(12px); } }
@keyframes slide-in { from { opacity: 0; transform: translateX(-14px); } }
@keyframes pop-in { from { opacity: 0; transform: scale(0.85); } }
@keyframes fill-in { from { transform: scaleX(0); } }

/* The brief prints: a scan line passes once as its rows arrive. */
.b-brief { overflow: hidden; }
.is-in .b-brief::after, .b-brief.is-in::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 40px;
  background: linear-gradient(180deg, transparent, var(--accent-soft), transparent);
  pointer-events: none;
  animation: print 1.1s var(--ease-in-out) 150ms both;
}
@keyframes print { from { transform: translateY(-40px); } to { transform: translateY(640px); opacity: 0; } }

/* Odometer digits. */
.odo { display: inline-flex; align-items: baseline; }
.odo-col { position: relative; display: inline-block; height: 1em; line-height: 1; overflow-y: clip; overflow-x: visible; vertical-align: baseline; }
.odo-size { visibility: hidden; }
.odo-strip { position: absolute; left: 50%; top: 0; display: flex; flex-direction: column; align-items: center; transform-origin: 0 0; translate: -50% 0; }
.odo-strip > span { display: block; height: 1em; line-height: 1; }

/* Flow focus: hover a node, its connections light and the rest recede. */
.b-flow.is-settled * { transition-delay: 0s !important; }
.b-flow .fl-edge, .b-flow .fl-head, .b-flow .fl-labels > g, .b-flow .fl-node rect { transition-property: opacity, stroke, fill, stroke-dashoffset, transform; }
.b-flow.is-focus .fl-node:not(.is-lit) { opacity: 0.28; }
.b-flow.is-focus :is(.fl-edge, .fl-head, .fl-labels > g):not(.is-lit) { opacity: 0.2; }
.b-flow .fl-edge.is-lit { stroke: var(--accent); }
.b-flow .fl-head.is-lit { fill: var(--accent); }
.b-flow .fl-node.is-lit rect { stroke: var(--accent); }
.b-flow .fl-node { cursor: default; }
.b-flow.is-focus .fl-spark { opacity: 0.25; }

/* Map ---------------------------------------------------------------------- */
.map { display: block; width: 100%; height: auto; overflow: visible; }
.map-edges line { stroke: var(--line-2); stroke-width: 0.6; transition: stroke var(--dur-2), opacity var(--dur-2); }
.map.is-hover .map-edges line { opacity: 0.35; }
.map.is-hover .map-edges line.is-lit { opacity: 1; stroke: var(--fg-3); }
.map-nodes circle { fill: var(--bg); stroke: var(--fg-3); stroke-width: 0.9; transition: fill var(--dur-3), stroke var(--dur-3), r var(--dur-3) var(--ease-spring); }
.map-nodes circle.is-visited { fill: var(--fg); stroke: var(--fg); }
.map-nodes circle.is-current { fill: var(--accent); stroke: var(--accent); r: 3.4; }
.map-nodes .map-hit { fill: transparent; stroke: none; cursor: pointer; r: 7; }
.map-route line {
  stroke: var(--accent);
  stroke-width: 1.2;
  stroke-linecap: round;
  stroke-dasharray: calc(var(--len) * 1px) calc(var(--len) * 1px);
  stroke-dashoffset: calc(var(--len) * 1px);
  transition: stroke-dashoffset 700ms var(--ease-in-out);
}
.map-route line.is-drawn { stroke-dashoffset: 0; }
.map-label, .map-tip { font: 400 9px/1 var(--font-mono); letter-spacing: 0.04em; pointer-events: none; }
.map-label { fill: var(--accent); paint-order: stroke; stroke: var(--bg); stroke-width: 4px; stroke-linejoin: round; }
.map-tip { fill: var(--fg); paint-order: stroke; stroke: var(--bg); stroke-width: 3px; }
.map.is-hover .map-label { opacity: 0; }
.rail-map-toggle {
  display: none;
  flex: none;
  align-items: center;
  gap: var(--space-2);
  padding: 0.3rem 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.04em;
  color: var(--fg-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-round);
  font-variant-numeric: tabular-nums;
}
.rail-map-toggle[aria-expanded='true'] { color: var(--accent); border-color: var(--accent-line); }
.map-count { margin-top: var(--space-2); font-family: var(--font-mono); font-size: var(--step--2); color: var(--fg-3); font-variant-numeric: tabular-nums; }

/* In the brief: the route, printed. */
.b-brief-body { display: grid; grid-template-columns: minmax(0, 1fr) 12rem; gap: var(--space-5); align-items: start; }
.b-brief-map { margin: 0; padding: var(--space-3); border: 1px solid var(--line); border-radius: var(--radius-1); background: var(--bg); }
.b-brief-map figcaption { margin-top: var(--space-2); }
.map.is-print .map-route line { transition: none; animation: route-draw 900ms var(--ease-in-out) backwards; animation-delay: calc(var(--i, 0) * 180ms + 400ms); }
@keyframes route-draw { from { stroke-dashoffset: calc(var(--len) * 1px); } }
@media (max-width: 720px) { .b-brief-body { grid-template-columns: 1fr; } .b-brief-map { max-width: 16rem; } }

/* ==========================================================================
   Reading settings — motion, text size (see src/prefs.js)
   ========================================================================== */

/* Text size */
html[data-text='large'] { font-size: 118.75%; }

/* Calm and off: nothing moves by itself. No entrance animations, no loops,
   no staggered reveals, no drawn-in diagrams. Content is simply there. */
html:not([data-motion='full']) .js .landing :is(.eyebrow, .display-line, .lede, .entry-item, .lens-caption, .offer, .entry-all, .entry-more, .land-cue),
html:not([data-motion='full']).js .landing :is(.eyebrow, .display-line, .lede, .entry-item, .lens-caption, .offer, .entry-all, .entry-more, .land-cue) { animation: none; }
html:not([data-motion='full']) :is(.pulse, .pulse::after, .scan-track i, .chip, .b-card, .b-layer, .b-pill, .b-brief dl > div, .b-progress-track i, .thinking-dots i) { animation: none !important; }
html:not([data-motion='full']) .pulse::after { animation: none !important; opacity: 0; }
html:not([data-motion='full']) :is(.b-brief::after, .is-in .b-brief::after) { content: none; }
html:not([data-motion='full']) .reveal { opacity: 1; transform: none; clip-path: none; }
html:not([data-motion='full']) .b-flow * { transition-delay: 0s !important; transition-duration: 0.01ms !important; }
html:not([data-motion='full']) .b-flow .fl-node { opacity: 1; transform: none; }
html:not([data-motion='full']) .b-flow .fl-edge { stroke-dashoffset: 0; }
html:not([data-motion='full']) .b-flow .fl-edge.is-loop,
html:not([data-motion='full']) .b-flow :is(.fl-head, .fl-edge-label, .fl-edge-label-bg) { opacity: 1; }
html:not([data-motion='full']) .fl-spark { display: none; }
html:not([data-motion='full']) .map-route line { transition: none; stroke-dashoffset: 0; }
html[data-motion='calm'] *, html[data-motion='calm'] *::before, html[data-motion='calm'] *::after { transition-duration: 150ms !important; transition-delay: 0s !important; }
html[data-motion='off'] *, html[data-motion='off'] *::before, html[data-motion='off'] *::after { animation-duration: 0.01ms !important; animation-delay: 0ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; transition-delay: 0ms !important; }

/* Settings button and panel */
.settings-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 0.8rem;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.04em;
  color: var(--fg-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-round);
}
.settings-toggle:hover, .settings-toggle[aria-expanded='true'] { color: var(--fg); border-color: var(--fg-3); }
.settings-toggle svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; }
.settings {
  position: absolute;
  z-index: 40;
  top: calc(100% + var(--space-2));
  right: var(--gutter);
  display: grid;
  gap: var(--space-4);
  width: min(22rem, calc(100vw - var(--gutter) * 2));
  padding: var(--space-5);
  background: var(--bg-raised);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-2);
  box-shadow: var(--shadow);
}
.settings-title { font-size: var(--step-1); font-weight: 500; }
.settings fieldset { display: grid; gap: var(--space-1); border: 0; padding: 0; margin: 0; }
.settings legend { margin-bottom: var(--space-2); font-family: var(--font-mono); font-size: var(--step--2); letter-spacing: var(--tracking-micro); text-transform: uppercase; color: var(--fg-2); }
.settings label {
  display: grid;
  grid-template-columns: 1.25rem 1fr;
  align-items: start;
  gap: var(--space-3);
  min-height: 2.5rem;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-1);
  font-size: var(--step--1);
  color: var(--fg-2);
  cursor: pointer;
}
.settings label:hover { background: var(--bg-sunken); }
.settings label:has(input:checked) { background: var(--accent-soft); color: var(--fg); }
.settings label b { display: block; font-weight: 500; color: var(--fg); }
.settings input { width: 1rem; height: 1rem; margin-top: 0.15rem; accent-color: var(--accent); }
.settings-close { justify-self: start; }
@media (max-width: 720px) { .settings-toggle span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; } .settings-toggle { width: 36px; padding: 0; justify-content: center; } }

/* ==========================================================================
   Landing: the offer in plain words
   ========================================================================== */
.offer {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  gap: var(--space-4) var(--space-6);
  max-width: 62rem;
  margin: var(--space-6) 0 0;
}
.offer-item { padding-top: var(--space-3); border-top: 1px solid var(--line-2); background: color-mix(in srgb, var(--bg) 75%, transparent); }
.offer dt { font-family: var(--font-mono); font-size: var(--step--2); letter-spacing: var(--tracking-micro); text-transform: uppercase; color: var(--fg-2); }
.offer dd { margin: var(--space-1) 0 0; font-size: var(--step-0); line-height: 1.5; color: var(--fg); }
.entry-more {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4) var(--space-6);
  max-width: 52rem;
  margin-top: var(--space-5);
}
.entry-more .entry-all { margin-top: 0; }
/* The calculator link: the one bordered item on the landing. */
.entry-tool {
  position: relative;
  display: grid;
  grid-template-columns: auto auto;
  column-gap: var(--space-4);
  align-items: center;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--accent-line);
  border-radius: var(--radius-2);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  overflow: hidden;
  isolation: isolate;
  transition: border-color var(--dur-2), transform var(--dur-2) var(--ease-out);
}
.entry-tool::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(100deg, var(--accent-soft), transparent 70%);
  transform: translateX(-101%);
  transition: transform 600ms var(--ease-out);
}
.entry-tool:hover, .entry-tool:focus-visible { border-color: var(--accent); }
.entry-tool:hover::before, .entry-tool:focus-visible::before { transform: none; }
.entry-tool-label { font-size: var(--step-0); font-weight: 500; color: var(--fg); }
.entry-tool-note { grid-row: 2; font-size: var(--step--1); color: var(--fg-2); }
.entry-tool .entry-arrow { grid-row: 1 / 3; grid-column: 2; color: var(--accent); }
.entry-tool:hover .entry-arrow { transform: translateX(4px); }
.entry-all { margin-top: var(--space-4); }
.entry-all a { font-size: var(--step-0); color: var(--fg); border-bottom: 1px solid var(--accent-line); padding-bottom: 2px; }
.entry-all a:hover { color: var(--accent); border-color: var(--accent); }
.noscript .offer { margin: var(--space-4) 0; }
.ask-prompt { font-size: var(--step--2); letter-spacing: var(--tracking-micro); text-transform: uppercase; color: var(--fg-2); }

/* Topic tags, facts, summary note */
.turn-tag {
  justify-self: start;
  margin-top: var(--space-2);
  padding: 0.2rem 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.04em;
  color: var(--fg-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-round);
}
.b-fact { max-width: var(--measure); font-size: var(--step-1); line-height: 1.6; }
.b-fact strong { font-weight: 500; }
.b-fact.is-missing { padding-left: var(--space-4); border-left: 2px solid var(--line-2); color: var(--fg-2); }
.b-fact-link { color: var(--accent); border-bottom: 1px solid currentColor; overflow-wrap: anywhere; }
.b-facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr)); border-top: 1px solid var(--line-2); }
.b-facts > div { display: grid; gap: var(--space-1); padding: var(--space-3) var(--space-4) var(--space-3) 0; border-bottom: 1px solid var(--line); }
.b-facts dd { margin: 0; font-size: var(--step--1); line-height: 1.5; }
.b-brief-note { margin-top: var(--space-4); font-size: var(--step--1); color: var(--fg-2); }

/* ==========================================================================
   One page (/#/all)
   ========================================================================== */
.page { width: min(46rem, 100%); margin: 0 auto; padding: var(--space-7) var(--gutter) var(--space-9); display: grid; gap: var(--space-8); }
.page-head { display: grid; gap: var(--space-5); }
.page-title { font-family: var(--font-display); font-weight: var(--weight-display); font-size: var(--step-4); line-height: 0.96; letter-spacing: var(--tracking-display); outline: none; }
.page-intro { font-size: var(--step-1); color: var(--fg-2); max-width: var(--measure); }
.page-toc { display: grid; gap: var(--space-2); }
.page-toc-list { display: grid; gap: var(--space-1); list-style: decimal; padding-left: 1.5rem; }
.page-toc-list a { color: var(--fg); border-bottom: 1px solid var(--line-2); }
.page-toc-list a:hover { color: var(--accent); border-color: var(--accent); }
.page-section { display: grid; gap: var(--space-5); scroll-margin-top: calc(var(--bar-h) + var(--space-5)); }
.page-section.is-l2 { padding-top: var(--space-6); border-top: 1px solid var(--line-2); }
.page-section.is-l3 { padding: var(--space-5) 0 0 var(--space-5); border-left: 1px solid var(--line-2); }
.page-heading { font-family: var(--font-display); font-weight: 750; font-size: var(--step-3); line-height: 1.04; letter-spacing: var(--tracking-display); }
.is-l3 > .page-heading { font-size: var(--step-2); }
.page-body { display: grid; gap: var(--space-5); min-width: 0; }
.page-appendix { display: grid; gap: var(--space-8); }
.page-appendix-title { font-family: var(--font-sans); font-size: var(--step--1); font-weight: 600; letter-spacing: var(--tracking-micro); text-transform: uppercase; color: var(--fg-2); padding-top: var(--space-6); border-top: 2px solid var(--fg); }
.page-foot { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.is-session:has(.page:not([hidden])) .ask { display: none; }
@media print {
  .page { display: block; padding: 0; }
  .page-section { break-inside: avoid-page; margin-bottom: 1.5rem; }
  .page-foot, .settings, .settings-toggle, .theme-toggle { display: none !important; }
}

/* Small screens: the illustration caption sits under the content, not over it. */
@media (max-width: 720px) {
  .lens-caption { position: relative; top: auto; left: auto; right: auto; grid-row: 2; margin-top: var(--space-5); max-width: none; }
  /* Room under the caption for the illustration itself. */
  .landing-hero { padding-bottom: 15rem; }
}


/* Compare: the same process, before and after ------------------------------ */
.b-compare { display: grid; gap: var(--space-4); min-width: 0; }
.cmp-head { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3) var(--space-5); }
.cmp-toggle {
  position: relative;
  display: inline-grid;
  grid-template-columns: repeat(var(--n, 2), minmax(5.5rem, auto));
  padding: 3px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-round);
  background: var(--bg-raised);
  isolation: isolate;
}
.cmp-thumb {
  position: absolute;
  z-index: -1;
  top: 3px; bottom: 3px; left: 3px;
  width: calc((100% - 6px) / var(--n, 2));
  border-radius: var(--radius-round);
  background: var(--fg);
  transform: translateX(calc(var(--at, 0) * 100%));
  transition: transform 520ms var(--ease-spring, var(--ease-out));
}
.cmp-btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-round);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: var(--tracking-micro);
  color: var(--fg-2);
  transition: color var(--dur-2);
}
.cmp-btn[aria-pressed='true'] { color: var(--bg); }
.cmp-btn:not([aria-pressed='true']):hover { color: var(--fg); }
.cmp-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.cmp-title { color: var(--fg-2); }
.b-compare[data-state='after'] .cmp-title { color: var(--accent); }

.cmp-flow {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  row-gap: var(--space-3);
  min-height: 4.25rem;
  padding: var(--space-4) 0;
  list-style: none;
}
.cmp-step { display: flex; align-items: center; }
.cmp-arrow {
  position: relative;
  display: grid;
  place-items: end center;
  align-self: stretch;
  width: 5.5rem;
  height: 2.2rem;
  margin: 0 2px;
}
.cmp-step:not(:has(.cmp-via)) .cmp-arrow { width: 2.75rem; }
.cmp-arrow::before { content: ''; position: absolute; left: 0; right: 6px; bottom: calc(1.1rem - 0.5px); height: 1px; background: var(--fg-3); }
.cmp-arrow::after { content: ''; position: absolute; right: 0; bottom: calc(1.1rem - 4px); border: 4px solid transparent; border-left: 6px solid var(--fg-3); border-right: 0; }
.cmp-via {
  position: absolute;
  top: -0.55rem;
  left: 0; right: 6px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--fg-2);
  white-space: nowrap;
}
.cmp-box {
  display: inline-block;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-1);
  background: var(--bg-raised);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--fg);
  white-space: nowrap;
  will-change: transform;
}
.cmp-step.is-muted .cmp-box { background: transparent; border-style: dashed; color: var(--fg-3); }
.cmp-step.is-accent .cmp-box { background: var(--accent-soft); border-color: var(--accent); color: var(--fg); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 10%, transparent); }
.cmp-ghost { position: absolute; margin: 0; pointer-events: none; }

.cmp-stat { display: flex; align-items: baseline; gap: var(--space-3); padding-top: var(--space-3); border-top: 1px solid var(--line); }
.cmp-stat-num { font-family: var(--font-display); font-weight: var(--weight-display); letter-spacing: var(--tracking-display); font-size: var(--step-4); line-height: 1; font-variant-numeric: tabular-nums lining-nums; min-width: 1ch; }
.b-compare[data-state='after'] .cmp-stat-num { color: var(--accent); }
.cmp-stat-label { color: var(--fg-2); }
.cmp-text { max-width: var(--measure); font-size: var(--step-1); line-height: 1.55; text-wrap: pretty; }

@media (max-width: 720px) {
  .cmp-flow { flex-direction: column; align-items: flex-start; flex-wrap: nowrap; }
  .cmp-step { flex-direction: column; align-items: flex-start; }
  .cmp-arrow, .cmp-step:not(:has(.cmp-via)) .cmp-arrow { width: auto; height: 2.1rem; margin: 0 0 0 1.25rem; place-items: center start; }
  .cmp-arrow::before { left: 0; top: 0; bottom: 6px; right: auto; width: 1px; height: auto; }
  .cmp-arrow::after { left: -4px; right: auto; bottom: 0; border: 4px solid transparent; border-top: 6px solid var(--fg-3); border-bottom: 0; }
  .cmp-via { position: static; margin-left: var(--space-3); text-align: left; }
}

/* Estimate: what repeated work costs ---------------------------------------- */
.b-estimate {
  display: grid;
  gap: var(--space-5);
  padding: var(--space-5);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-2);
  background: var(--bg-raised);
}
.est-title { color: var(--fg-2); }
.est-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: var(--space-6); }
.est-fields { display: grid; gap: var(--space-4); align-content: start; }
.est-field { display: grid; gap: var(--space-2); }
.est-label { font-size: var(--step-0); font-weight: 500; color: var(--fg); }
.est-control {
  display: flex;
  align-items: stretch;
  max-width: 15rem;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-2);
  background: var(--bg);
  overflow: hidden;
  transition: border-color var(--dur-1), box-shadow var(--dur-1);
}
.est-control:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.est-control:has([aria-invalid='true']) { border-color: var(--accent); }
.est-step {
  flex: none;
  width: 2.75rem;
  min-height: 2.75rem;
  font-size: var(--step-1);
  color: var(--fg-2);
  transition: background var(--dur-1), color var(--dur-1);
}
.est-step:hover { background: var(--accent-soft); color: var(--accent); }
.est-step:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.est-step:active { transform: scale(0.94); }
.est-prefix { display: grid; place-items: center; padding-left: var(--space-2); font-family: var(--font-mono); color: var(--fg-2); border-left: 1px solid var(--line); }
.est-input {
  flex: 1;
  min-width: 0;
  padding: 0 var(--space-2);
  border-inline: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--step-1);
  font-variant-numeric: tabular-nums;
  text-align: center;
  color: var(--fg);
  background: transparent;
  -moz-appearance: textfield;
}
.est-prefix + .est-input { border-left: 0; text-align: left; }
.est-input::-webkit-inner-spin-button, .est-input::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
.est-input:focus { outline: none; }
.est-hint { font-size: var(--step--1); color: var(--fg-2); }
.est-hint.is-error { color: var(--accent); }

.est-results { display: grid; gap: var(--space-3); align-content: start; }
.est-dl { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line-2); }
.est-dl > div { padding: var(--space-3) var(--space-4) 0 0; }
.est-dl > div + div { padding-left: var(--space-4); border-left: 1px solid var(--line); }
.est-dl dd { margin: var(--space-2) 0 0; }
.est-num { display: block; font-family: var(--font-display); font-weight: var(--weight-display); font-size: clamp(2rem, 1.2rem + 2.4vw, 3.25rem); line-height: 1; letter-spacing: var(--tracking-display); font-variant-numeric: tabular-nums lining-nums; white-space: nowrap; }
.est-num.is-accent { color: var(--accent); }
.est-weeks { font-size: var(--step-0); color: var(--fg-2); }
.est-weeks-num { font-weight: 600; color: var(--fg); font-variant-numeric: tabular-nums; }
.est-grid-wrap { display: grid; gap: var(--space-2); }
.est-grid { display: grid; grid-template-columns: repeat(23, 1fr); gap: 3px; }
.est-grid i {
  aspect-ratio: 1;
  border-radius: 1px;
  background: var(--line);
  transition: background-color 260ms var(--ease-out) var(--d, 0ms), transform 420ms var(--ease-spring, var(--ease-out)) var(--d, 0ms);
}
.est-grid i[hidden] { display: none; }
.est-grid i.is-on { background: var(--accent); transform: scale(1.08); }
.est-more { color: var(--accent); }
.est-key { font-size: var(--step--1); color: var(--fg-2); }
.est-note { max-width: var(--measure); font-size: var(--step--1); color: var(--fg-2); padding-top: var(--space-4); border-top: 1px solid var(--line); }
.est-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-4); }
.est-add:disabled { filter: saturate(0.3); opacity: 0.7; cursor: default; }
.est-added { font-size: var(--step--1); color: var(--accent); }
@media (max-width: 820px) {
  .est-body { grid-template-columns: 1fr; }
  .b-estimate { padding: var(--space-4); }
}
html:not([data-motion='full']) .est-grid i { transition: none; transform: none; }
html:not([data-motion='full']) .cmp-thumb { transition: none; }
@media print { .cmp-toggle, .est-step, .est-actions { display: none; } }
@media (forced-colors: active) {
  .cmp-btn[aria-pressed='true'] { outline: 2px solid Highlight; color: HighlightText; background: Highlight; }
  .cmp-thumb { display: none; }
  .est-grid i[hidden] { display: none; }
.est-grid i.is-on { background: Highlight; }
}

/* One page: sections rise in as you scroll to them. Scroll-driven, so they move
   only when the visitor scrolls; full motion only; no effect where unsupported. */
@supports (animation-timeline: view()) {
  @media screen {
    /* Headings and single blocks only: a whole section can be thousands of
       pixels tall and would stay half-faded long after it is on screen. */
    html[data-motion='full'] :is(.page-heading, .page-body > *) {
      animation: page-in linear forwards;
      animation-timeline: view();
      animation-range: entry 0% entry 100%;
    }
  }
}
@keyframes page-in { from { opacity: 0.15; transform: translateY(18px); } }

/* Section: a heading over a group of blocks. ------------------------------ */
.b-section { display: grid; gap: var(--space-4); min-width: 0; }
.b-section-head { display: grid; gap: var(--space-1); }
.b-section-title { font: 700 var(--step-2)/1.15 var(--font-display); letter-spacing: var(--tracking-tight); text-wrap: balance; }
.b-section .b-section .b-section-title { font-size: var(--step-1); }
.b-section.is-raised { padding: var(--space-5); border: 1px solid var(--line); border-radius: var(--radius-2); background: var(--bg-raised); }
.b-section.is-accent { padding-left: var(--space-5); border-left: 2px solid var(--accent-line); }
.b-section.is-accent .b-section-head .micro { color: var(--accent); }
@media (max-width: 720px) { .b-section.is-raised { padding: var(--space-4); } }

/* Landing, screens two to four: one idea each, with room around it. ------- */
.land-cue {
  justify-self: start;
  display: inline-flex;
  gap: var(--space-2);
  margin-top: var(--space-7);
  padding-bottom: 2px;
  font-size: var(--step--1);
  color: var(--fg-2);
  border-bottom: 1px solid var(--line-2);
  pointer-events: auto;
}
.land-cue:hover { color: var(--accent); border-color: var(--accent); }
.landing-steps { padding: 0 var(--gutter); }
.land-step { max-width: 78rem; margin: 0 auto; }
.land-step {
  min-height: 70svh;
  display: grid;
  align-content: center;
  gap: var(--space-6);
  padding: var(--space-9) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: var(--bar-h);
}
.land-step-head {
  font-family: var(--font-sans);
  font-size: var(--step--2);
  font-weight: 600;
  letter-spacing: var(--tracking-micro);
  text-transform: uppercase;
  color: var(--fg-3);
}
.land-step .lede {
  max-width: 40rem;
  margin: 0;
  font-family: var(--font-voice);
  font-style: italic;
  font-weight: 300;
  font-size: var(--step-4);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--fg);
  text-wrap: balance;
}
.land-step .offer { margin: 0; max-width: 40rem; grid-template-columns: 1fr; gap: var(--space-6); }
.land-step .offer-item { background: none; padding-top: var(--space-4); }
.land-step .offer dd { margin-top: var(--space-2); font-size: var(--step-2); line-height: 1.35; text-wrap: pretty; }
.land-step .entry { margin-top: 0; }
.land-step .entry-more { margin-top: var(--space-4); }
.land-step:last-child { padding-bottom: calc(3.25rem + var(--space-9)); }

/* The ask bar waits until the reader has left the headline screen. */
.is-landing.is-hero .ask { opacity: 0; transform: translate(-50%, 1rem); visibility: hidden; pointer-events: none; }
.is-landing .ask { transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out), visibility 0s linear 0s, border-color var(--dur-2); }
.is-landing.is-hero .ask { transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-out), visibility 0s linear var(--dur-2); }

/* Each screen rises once, as it scrolls into view (only when the visitor scrolls).
   No backwards fill: before it enters, a screen keeps its normal, visible style.
   It is below the fold then, so readers never see that; full-page captures and
   anything else that does not scroll get the whole page. */
@supports (animation-timeline: view()) {
  html[data-motion='full'] .land-step > * {
    animation: rise linear forwards;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}

@media (max-width: 720px) {
  .land-step { min-height: 0; padding: var(--space-8) 0; gap: var(--space-5); }
  .land-step .lede { font-size: var(--step-3); }
  .land-step .offer dd { font-size: var(--step-1); }
  .land-step:last-child { padding-bottom: calc(3.25rem + var(--space-8)); }
}

/* ==========================================================================
   Room to read: topics and the one-page view.
   Paragraphs sit close together; anything that is not a paragraph (a
   diagram, numbers, a list, a table) gets extra space above and below,
   so each one reads as its own thing.
   ========================================================================== */
.turn { gap: var(--space-6); }
.turn-a, .page-body { gap: var(--space-6); }
.turn-a > :not(.b-text, .b-callout, .b-fact, .scan, .chips),
.page-body > :not(.b-text, .b-callout, .b-fact) { margin-block: var(--space-3); }
.b-text + .b-text { margin-top: calc(var(--space-3) * -1); }
.chips { margin-top: var(--space-6); }
.page-section { gap: var(--space-6); }
.page-section.is-l2 { padding-top: var(--space-7); }

/* Facts as a list: same size as body text, one per row, with room. */
.b-facts { grid-template-columns: 1fr; max-width: var(--measure); }
.b-facts > div { gap: var(--space-2); padding: var(--space-4) 0; }
.b-facts dd { font-size: var(--step-1); line-height: 1.5; color: var(--fg); }

/* The map is there when asked for, not beside every answer. */
.rail-map { display: none; }
.rail.is-map-open .rail-map { display: block; }
.rail-map-toggle { display: inline-flex; justify-self: start; margin-top: var(--space-4); }
.rail-map-toggle:hover { color: var(--fg); border-color: var(--fg-3); }

@media (max-width: 720px) {
  .turn-a, .page-body { gap: var(--space-5); }
  .rail-map-toggle { margin-top: 0; }
  /* Three numbers fit on one row on a phone. */
  .b-metric-row { grid-template-columns: repeat(auto-fit, minmax(6rem, 1fr)); }
  .b-metric-row > div { padding-right: var(--space-2); }
  .b-metric-row > div + div { padding-left: var(--space-3); }
  .b-metric-row .b-metric-value { font-size: var(--step-3); }
}

/* Next topics: offered, not shouting. No rules between rows, secondary text
   colour, close together, as wide as the answer's text. The one action
   (is-primary) stays a filled button. */
.chips { max-width: var(--measure); border-bottom: 0; }
.chips-heading { margin-bottom: var(--space-1); }
.chip { padding: 0.5rem 0; color: var(--fg-2); border-top: 0; }
.chip:hover, .chip:focus-visible { color: var(--fg); }
.chip:hover .chip-label { text-decoration: underline; text-decoration-color: var(--line-2); text-underline-offset: 0.2em; }
.chip::after { display: none; }
.chip.is-engage::before { display: none; }
.chip.is-engage { color: var(--accent); }