/* Proof components, Design C: "The Climb".
   Tokens only (var(--waya-*), --fg-*, --border-1, --shadow-*, --font-*) plus color-mix().
   Every rule is scoped under html.design-c. Classes prefixed dc- are built by design-c.js;
   the hero rules key on .proof-hero so the page restyles once, when this file arrives. */

html.design-c {
  --dc-sage-deep: color-mix(in srgb, var(--waya-sage) 75%, var(--waya-ink));
  --dc-muted: color-mix(in srgb, var(--waya-stone) 78%, var(--waya-ink));
  --dc-contour: color-mix(in srgb, var(--waya-tan) 25%, transparent);
  --dc-ease-out: cubic-bezier(0.2, 0.7, 0.2, 1);
}

html.design-c .dc-sr {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%);
  white-space: nowrap; border: 0;
}

/* ===================================================================== shared: slope chart */

html.design-c .dc-chart { position: relative; width: 100%; height: 240px; flex: none; }
html.design-c .dc-chart.is-compact { height: 180px; }
html.design-c .dc-chart-svg {
  position: absolute; left: 0; top: 0;
  width: 100%; height: 100%;
  display: block; overflow: visible;
}
html.design-c .dc-c-gridline { stroke: var(--border-1); stroke-width: 1; }
html.design-c .dc-c-baseline { stroke: color-mix(in srgb, var(--waya-charcoal) 45%, transparent); stroke-width: 1; }
html.design-c .dc-c-xtick { stroke: color-mix(in srgb, var(--waya-charcoal) 45%, transparent); stroke-width: 1; }
html.design-c .dc-c-tick,
html.design-c .dc-c-x {
  font-family: var(--font-body); font-size: 12px;
  font-variant-numeric: tabular-nums;
  fill: var(--dc-muted);
}
html.design-c .dc-c-axis {
  font-family: var(--font-display); font-weight: 600; font-size: 12px;
  letter-spacing: 0.02em;
  fill: var(--waya-charcoal);
}
html.design-c .is-compact .dc-c-tick,
html.design-c .is-compact .dc-c-x { font-size: 10.5px; }
html.design-c .is-compact .dc-c-axis { font-size: 11px; }

html.design-c .dc-c-fill-up { fill: color-mix(in srgb, var(--waya-sage) 22%, transparent); }
html.design-c .dc-c-fill-down { fill: color-mix(in srgb, var(--waya-sage) 15%, transparent); }
html.design-c .dc-c-guide {
  stroke: var(--waya-stone); stroke-width: 1;
  stroke-dasharray: 3 4;
  opacity: 0.6;
}
html.design-c .dc-c-line {
  fill: none;
  stroke: var(--waya-sage); stroke-width: 3;
  stroke-linecap: round;
}
html.design-c .dc-c-pt { transform-box: fill-box; transform-origin: center; }
html.design-c .dc-c-pt-before { fill: var(--waya-stone); stroke: var(--waya-paper); stroke-width: 2; }
html.design-c .dc-c-pt-after { fill: var(--dc-sage-deep); stroke: var(--waya-paper); stroke-width: 2; }
html.design-c .dc-c-val {
  font-family: var(--font-display); font-weight: 600; font-size: 14px;
  fill: var(--waya-charcoal);
  opacity: 1;
  font-variant-numeric: tabular-nums;
}
html.design-c .is-compact .dc-c-val { font-size: 12.5px; }

/* draw-on-scroll: points pop (JS adds .is-on). Value labels are never faded. */
html.design-c .dc-c-pt {
  opacity: 0;
  transform: scale(0.2);
  transition: opacity 200ms var(--ease-standard), transform 260ms var(--dc-ease-out);
}
html.design-c .dc-c-pt.is-on { opacity: 1; transform: none; }

/* ===================================================================== shared: text */

html.design-c .dc-after {
  font-family: var(--font-display); font-weight: 700;
  font-size: 40px; line-height: 1.05; letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--waya-ink);
  overflow-wrap: anywhere;
}
html.design-c .dc-label {
  font-family: var(--font-body); font-weight: 500;
  font-size: 15px; line-height: 1.4;
  color: var(--waya-charcoal);
  overflow-wrap: anywhere;
}
html.design-c .dc-kicker {
  font-family: var(--font-display); font-weight: 600;
  font-size: 12px; line-height: 1.4;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--dc-muted);
}
html.design-c .dc-more {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display); font-weight: 600; font-size: 14px;
  color: var(--waya-charcoal);
}
html.design-c .dc-more::after {
  content: '';
  width: 7px; height: 7px;
  border-top: 2px solid var(--waya-rust); border-right: 2px solid var(--waya-rust);
  transform: rotate(45deg);
  transition: transform var(--dur-base) var(--ease-standard);
}

/* standalone chart inside a story card */
html.design-c .dc-chart-solo { position: relative; width: 100%; min-width: 0; }
html.design-c .dc-chart-solo .dc-chart { height: 240px; }
@media (max-width: 640px) {
  html.design-c .dc-chart-solo .dc-chart { height: 200px; }
}

/* ===================================================================== strip */

html.design-c .dc-strip-band {
  position: relative;
  isolation: isolate;
  background: var(--waya-cream);
}
html.design-c .proof.dc-strip { position: static; background: none; border: 0; }
html.design-c .dc-contour {
  position: absolute; left: 0; top: 0;
  width: 100%; height: 100%;
  z-index: -1;
  pointer-events: none;
}
html.design-c .dc-contour path {
  fill: none;
  stroke: var(--dc-contour); stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}

html.design-c .dc-strip-wrap { position: relative; }
html.design-c .dc-cards {
  position: relative; z-index: 1;
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
html.design-c .dc-n2 .dc-cards {
  grid-template-columns: repeat(auto-fit, minmax(240px, 520px));
  justify-content: center;
}
html.design-c .dc-card-item { display: flex; min-width: 0; margin: 0; padding: 0; }
html.design-c .dc-card {
  display: flex; flex-direction: column;
  width: 100%; min-height: 320px;
  background: var(--waya-paper);
  border-radius: 18px;
  box-shadow: var(--shadow-1);
  overflow: hidden;
  color: inherit; text-decoration: none;
  transition: transform var(--dur-base) var(--ease-standard), box-shadow var(--dur-base) var(--ease-standard);
}
html.design-c .dc-card .dc-chart { width: auto; margin: 18px 16px 0; }
html.design-c .dc-card-body {
  display: flex; flex-direction: column; gap: 6px;
  flex: 1;
  padding: 14px 22px 20px;
  min-width: 0;
}
html.design-c .dc-card-body .dc-kicker { margin-top: 2px; }
html.design-c .dc-card .dc-more { margin-top: auto; padding-top: 12px; }

html.design-c .dc-card:hover,
html.design-c .dc-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-3);
}
html.design-c .dc-card:hover .dc-more::after,
html.design-c .dc-card:focus-visible .dc-more::after { transform: translateX(3px) rotate(45deg); }
html.design-c .dc-card:focus { outline: none; }
html.design-c .dc-card:focus-visible {
  outline: 2px solid var(--dc-sage-deep);
  outline-offset: 3px;
}

html.design-c .dc-cta {
  position: relative; z-index: 1;
  margin: 56px 0 0;
  text-align: center;
}
html.design-c .dc-cta .btn-rust {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 56px;
  padding: 0 36px;
  border-radius: 999px;
  font-size: 16px;
}
html.design-c .dc-cta .btn-rust:focus-visible {
  outline: 2px solid var(--dc-sage-deep);
  outline-offset: 3px;
}

@media (min-width: 961px) and (max-width: 1180px) {
  html.design-c .dc-n4 .dc-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  html.design-c .dc-cards,
  html.design-c .dc-n2 .dc-cards { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  html.design-c .dc-card { min-height: 0; }
  html.design-c .dc-card .dc-after { font-size: 36px; }
  html.design-c .dc-cta { margin-top: 36px; }
  html.design-c .dc-cta .btn-rust { display: flex; width: 100%; }
}

/* ===================================================================== problem page: hero */

html.design-c .proof-hero {
  background-color: var(--waya-paper);
  background-image: none;
  min-height: 520px;
  padding: 104px 56px 220px;
  overflow: hidden;
}
html.design-c .proof-hero::after { content: none; display: none; }
html.design-c .proof-hero .hero-inner { position: relative; z-index: 2; }
html.design-c .proof-hero .eyebrow { color: var(--waya-charcoal); }
html.design-c .proof-hero h1 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 68px;
  color: var(--waya-ink);
}
html.design-c .proof-hero .sub {
  font-family: var(--font-body);
  font-size: 20px;
  color: var(--waya-charcoal);
}

html.design-c .dc-ridges {
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 230px;
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
}
html.design-c .dc-ridge {
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 100%;
  will-change: transform;
}
html.design-c .dc-ridge svg { display: block; width: 100%; height: 100%; }
html.design-c .dc-ridge-back path { fill: var(--waya-tan); }
html.design-c .dc-ridge-mid path { fill: var(--waya-sage); }
html.design-c .dc-ridge-front path { fill: color-mix(in srgb, var(--waya-charcoal) 70%, transparent); }

@media (max-width: 960px) {
  html.design-c .proof-hero { padding: 96px 28px 200px; min-height: 500px; }
  html.design-c .proof-hero h1 { font-size: 52px; }
  html.design-c .dc-ridges { height: 210px; }
}
@media (max-width: 640px) {
  html.design-c .proof-hero { padding: 72px 20px 168px; min-height: 460px; }
  html.design-c .proof-hero h1 { font-size: 40px; }
  html.design-c .proof-hero .sub { font-size: 18px; }
  html.design-c .dc-ridges { height: 172px; }
}

/* ===================================================================== problem page: cases */

html.design-c .proof.dc-cases { background: none; border: 0; }
html.design-c .dc-timeline {
  position: relative;
  list-style: none;
  max-width: 960px;
  margin: 0 auto; padding: 0 0 0 56px;
  display: grid; gap: 36px;
}
html.design-c .dc-timeline::before {
  content: '';
  position: absolute; left: 19px; top: 44px; bottom: 44px;
  border-left: 2px dashed color-mix(in srgb, var(--waya-sage) 60%, transparent);
}
html.design-c .dc-tl-item { position: relative; min-width: 0; margin: 0; padding: 0; }
html.design-c .dc-tl-item::before {
  content: '';
  position: absolute; left: -45px; top: 36px;
  width: 18px; height: 18px; box-sizing: border-box;
  border-radius: 50%;
  background: var(--waya-cream);
  border: 2px solid var(--waya-sage);
  transition: background-color 300ms var(--ease-standard), border-color 300ms var(--ease-standard);
}
html.design-c .dc-tl-item.is-drawn::before { background: var(--dc-sage-deep); border-color: var(--dc-sage-deep); }

html.design-c .dc-route {
  position: relative;
  padding: 28px 32px 26px;
  background: var(--waya-paper);
  border-radius: 20px;
  box-shadow: var(--shadow-1);
  transition: transform var(--dur-base) var(--ease-standard), box-shadow var(--dur-base) var(--ease-standard);
}
html.design-c .dc-route:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-3);
}
html.design-c .dc-route:hover .dc-more::after { transform: translateX(3px) rotate(45deg); }
html.design-c .dc-route .dc-kicker { margin: 0 0 6px; }
html.design-c .dc-route-title {
  margin: 0;
  font-family: var(--font-display); font-weight: 600;
  font-size: 26px; line-height: 1.2; letter-spacing: -0.01em;
  color: var(--waya-charcoal);
  text-wrap: balance;
}
html.design-c .dc-route-link { color: inherit; text-decoration: none; }
html.design-c .dc-route-link::after {
  content: '';
  position: absolute; inset: 0;
  z-index: 1;
  border-radius: 20px;
}
html.design-c .dc-route:hover .dc-route-link {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
  text-decoration-color: var(--waya-sage);
}
html.design-c .dc-route-link:focus { outline: none; }
html.design-c .dc-route-link:focus-visible::after {
  outline: 2px solid var(--dc-sage-deep);
  outline-offset: 4px;
}
html.design-c .dc-route .dc-chart { margin-top: 20px; max-width: 720px; }
html.design-c .dc-result {
  display: flex; flex-wrap: wrap; align-items: baseline;
  gap: 4px 14px;
  margin: 18px 0 0;
}
html.design-c .dc-route .dc-after { font-size: 44px; }
html.design-c .dc-route .dc-label { font-size: 16px; }
/* Timeframe is a caption under the result, never a label on the chart. */
html.design-c .dc-timeframe {
  margin: 6px 0 0;
  font-family: var(--font-body); font-size: 14px; line-height: 1.4;
  color: var(--dc-muted);
}
html.design-c .dc-summary {
  margin: 12px 0 0;
  max-width: 64ch;
  font-family: var(--font-body); font-size: 16px; line-height: 1.55;
  color: var(--waya-charcoal);
}
html.design-c .dc-markers {
  margin: 22px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px 24px;
}
html.design-c .dc-marker {
  min-width: 0;
  padding-top: 10px;
  border-top: 2px solid var(--waya-sage);
}
html.design-c .dc-marker.is-qual { border-top-style: dashed; }
html.design-c .dc-marker dt {
  font-family: var(--font-body); font-weight: 500; font-size: 14px; line-height: 1.4;
  color: var(--waya-charcoal);
}
html.design-c .dc-marker dd {
  margin: 4px 0 0;
  font-family: var(--font-display); font-weight: 600;
  font-size: 18px; line-height: 1.3;
  font-variant-numeric: tabular-nums;
  color: var(--waya-ink);
  overflow-wrap: anywhere;
}
html.design-c .dc-v-before { color: var(--dc-muted); font-weight: 500; }
html.design-c .dc-v-arrow { color: var(--waya-rust); }
html.design-c .dc-route .dc-more { margin-top: 20px; }

@media (max-width: 640px) {
  html.design-c .dc-timeline { padding-left: 24px; gap: 24px; }
  html.design-c .dc-timeline::before { left: 6px; top: 34px; bottom: 34px; }
  html.design-c .dc-tl-item::before { left: -24px; top: 28px; width: 14px; height: 14px; }
  html.design-c .dc-route { padding: 22px 18px 22px; }
  html.design-c .dc-route .dc-chart { height: 220px; }
  html.design-c .dc-route-title { font-size: 22px; }
  html.design-c .dc-route .dc-after { font-size: 36px; }
  html.design-c .dc-markers { grid-template-columns: minmax(0, 1fr); }
}

/* ===================================================================== reduced motion: end state, no movement */

html.design-c .dc-rm,
html.design-c .dc-rm *,
html.design-c .dc-rm *::before,
html.design-c .dc-rm *::after {
  transition: none !important;
  animation: none !important;
}
html.design-c .dc-rm .dc-ridge { will-change: auto; }

@media (prefers-reduced-motion: reduce) {
  html.design-c [class*="dc-"],
  html.design-c [class*="dc-"]::before,
  html.design-c [class*="dc-"]::after,
  html.design-c .dc-cards *,
  html.design-c .dc-timeline * {
    transition: none !important;
    animation: none !important;
  }
  html.design-c .dc-card:hover,
  html.design-c .dc-card:focus-visible,
  html.design-c .dc-route:hover { transform: none; }
}