/* ==========================================================================
   Base: reset, tone resolution, typography primitives, layout, utilities
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* --- Tone resolution ------------------------------------------------------ */
body,
[data-tone="base"] {
  --bg: var(--base-bg);
  --bg-alt: var(--base-bg-alt);
  --fg: var(--base-fg);
  --fg-muted: var(--base-fg-muted);
  --line: var(--base-line);
  --line-strong: var(--base-line-strong);
  --accent: var(--base-accent);
  --graphic: var(--base-graphic);
  --gold: var(--base-gold);
  --gold-line: var(--base-gold-line);
  --em: var(--base-em);
  --btn-bg: var(--base-btn-bg);
  --btn-fg: var(--base-btn-fg);
  --btn-bg-hover: var(--base-btn-bg-hover);
  --plate: var(--base-plate);
  --mark-1: var(--base-mark-1);
  --mark-2: var(--base-mark-2);
  --mark-3: var(--base-mark-3);
}

[data-tone="inverse"] {
  --bg: var(--inv-bg);
  --bg-alt: var(--inv-bg-alt);
  --fg: var(--inv-fg);
  --fg-muted: var(--inv-fg-muted);
  --line: var(--inv-line);
  --line-strong: var(--inv-line-strong);
  --accent: var(--inv-accent);
  --graphic: var(--inv-graphic);
  --gold: var(--inv-gold);
  --gold-line: var(--inv-gold-line);
  --em: var(--inv-em);
  --btn-bg: var(--inv-btn-bg);
  --btn-fg: var(--inv-btn-fg);
  --btn-bg-hover: var(--inv-btn-bg-hover);
  --plate: var(--inv-plate);
  --mark-1: var(--inv-mark-1);
  --mark-2: var(--inv-mark-2);
  --mark-3: var(--inv-mark-3);
}

[data-tone="mist"] {
  --bg: var(--mist-bg);
  --bg-alt: var(--mist-bg-alt);
  --fg: var(--mist-fg);
  --fg-muted: var(--mist-fg-muted);
  --line: var(--mist-line);
  --line-strong: var(--mist-line-strong);
  --accent: var(--mist-accent);
  --gold: var(--mist-gold);
  --em: var(--mist-em);
}

[data-tone] {
  background-color: var(--bg);
  color: var(--fg);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  font-feature-settings: "cv11", "ss03";
  font-variant-numeric: lining-nums;
  background-color: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

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

h1,
h2,
h3,
h4,
p,
ol,
ul,
dl,
dd,
figure,
blockquote {
  margin: 0;
}

ol,
ul {
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

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

::selection {
  background: var(--yr-ochre);
  color: var(--yr-ink-deep);
}

/* --- Typography primitives ---------------------------------------------- */
.display {
  font-family: var(--font-display);
  font-weight: var(--display-weight);
  letter-spacing: var(--display-tracking);
  line-height: var(--display-leading);
  font-optical-sizing: auto;
  font-variant-numeric: lining-nums;
  text-wrap: balance;
}

.display em {
  font-style: var(--em-style);
  color: var(--em);
}

.t-hero {
  font-size: calc(var(--step-6) * var(--display-scale));
}

.t-1 {
  font-size: calc(var(--step-5) * var(--display-scale));
}

.t-2 {
  font-size: calc(var(--step-4) * var(--display-scale));
}

.t-3 {
  font-size: calc(var(--step-3) * var(--display-scale));
  line-height: 1.12;
}

.t-4 {
  font-size: calc(var(--step-2) * var(--display-scale));
  line-height: 1.2;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.eyebrow {
  align-self: start;
}

@media (min-width: 64em) {
  .section-head--split {
    align-items: start;
  }

  .section-head--split > .eyebrow,
  .intro__label,
  .statement > .eyebrow {
    margin-top: 1.25rem;
  }
}

.eyebrow--rule::before {
  content: "";
  width: 2.25rem;
  height: 0;
  border-top: 1px solid var(--gold-line, var(--accent));
}

.lede {
  font-size: var(--step-1);
  line-height: 1.6;
  color: var(--fg-muted);
  max-width: 36em;
}

.prose p + p {
  margin-top: 1.1em;
}

.prose {
  max-width: 38em;
}

.muted {
  color: var(--fg-muted);
}

.small {
  font-size: var(--step--1);
  line-height: 1.55;
}

[class*="__num"],
[class*="__year"],
[class*="__when"] {
  font-variant-numeric: lining-nums tabular-nums;
}

.num {
  font-variant-numeric: tabular-nums lining-nums;
}

/* --- Layout -------------------------------------------------------------- */
.wrap {
  width: min(100% - 2 * var(--gutter), var(--wrap));
  margin-inline: auto;
}

.section {
  position: relative;
  padding-block: var(--section-y);
}

.section--tight {
  padding-block: var(--section-y-tight);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--col-gap);
}

.section-head {
  display: grid;
  gap: 1.25rem;
  margin-bottom: clamp(2.5rem, 1.6rem + 3vw, 4.5rem);
}

@media (min-width: 64em) {
  .section-head--split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    column-gap: var(--col-gap);
    align-items: end;
  }
}

.rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

/* --- Utilities ----------------------------------------------------------- */
.surface-alt {
  background-color: var(--bg-alt);
}

.footnote {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  color: var(--fg-muted);
  max-width: 62em;
}

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

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -4rem;
  z-index: 200;
  padding: 0.75rem 1.25rem;
  background: var(--yr-ink);
  color: var(--yr-cream);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--dur-fast) var(--ease-out);
}

.skip-link:focus {
  top: 0.75rem;
}

.icon-arrow {
  width: 1.05em;
  height: 1.05em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: square;
  transition: transform var(--dur) var(--ease-out);
}

/* --- Scroll reveal (JS adds .reveal-pending only to below-the-fold nodes) - */
html .reveal-pending {
  opacity: 0;
  transform: translateY(1.25rem);
}

html .reveal-in {
  opacity: 1;
  transform: none;
  transition:
    opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html .reveal-pending {
    opacity: 1;
    transform: none;
  }
}

/* --- Print: case studies and bios must print/PDF complete ----------------- */
@media print {
  .reveal-pending {
    opacity: 1 !important;
    transform: none !important;
  }

  .site-header {
    position: static;
  }

  .proposal-switch,
  .menu-toggle,
  .mobile-menu,
  .skip-link,
  .hero__lines,
  .filters {
    display: none !important;
  }
}