/* ============================================================================
   IBB — Reset, typography, layout primitives, motion primitives
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + var(--s-3));
}

body {
  margin: 0;
  background: var(--surface-white);
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;         /* belt-and-braces: nothing may scroll the page sideways */
}

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

/* ---- headings ----------------------------------------------------------- */
h1, h2, h3, h4 {
  margin: 0;
  color: var(--text-primary);
  font-family: var(--font-display);
  font-weight: 600;
  line-height: var(--lh-snug);
  text-wrap: balance;
}
h1 { font-size: var(--fs-display); line-height: var(--lh-tight); letter-spacing: var(--ls-tight); }
h2 { font-size: var(--fs-h2); letter-spacing: -.014em; }
h3 { font-size: var(--fs-h3); letter-spacing: -.008em; }
h4 { font-size: var(--fs-h4); font-family: var(--font-body); font-weight: 600; }

p { margin: 0; }
p + p { margin-top: var(--s-2); }

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

/* ---- links -------------------------------------------------------------- */
a { color: var(--brand-primary-mid); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--brand-primary); }

/* ---- focus: always visible, never removed ------------------------------- */
:focus-visible {
  outline: 2px solid var(--brand-accent);
  outline-offset: 3px;
  border-radius: 3px;
}
.on-dark :focus-visible, .is-dark :focus-visible { outline-color: var(--brand-accent); }

::selection { background: var(--brand-accent); color: var(--brand-primary-dark); }

/* ---- skip link ---------------------------------------------------------- */
.skip-link {
  position: absolute; left: var(--s-2); top: -100px; z-index: 200;
  padding: var(--s-1) var(--s-2);
  background: var(--brand-accent); color: var(--brand-primary-dark);
  font-weight: 600; font-size: var(--fs-sm); border-radius: var(--radius-sm);
  text-decoration: none; transition: top var(--dur-fast) var(--ease);
}
.skip-link:focus { top: var(--s-2); }

.visually-hidden {
  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;
}

/* ============================================================================
   Layout primitives
   ========================================================================== */

.shell {                       /* the one content container, used everywhere */
  width: 100%;
  max-width: var(--content);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.shell--wide   { max-width: var(--content-wide); }
.shell--narrow { max-width: var(--content-narrow); }

.section { padding-block: var(--section-y); }
.section--tight { padding-block: var(--section-y-tight); }
/* Halves a section's top padding only. For blocks whose heading would otherwise
   sit under a full section's worth of space stacked on whatever the preceding
   block already pads with — which reads as a gap rather than a break. */
.section--tight-top { padding-top: calc(var(--section-y) * .5); }
.section--tight-bottom { padding-bottom: calc(var(--section-y) * .5); }
/* Both sides at 80% of a full section, kept symmetric. */
.section--y-80 { padding-block: calc(var(--section-y) * .8); }

/* Section ground colours — alternated down each page so no two adjacent
   sections share a background and dividers are never needed. */
.section--white { background: var(--surface-white); }
.section--light { background: var(--surface-light); }
.section--navy  { background: var(--brand-primary-dark); }
.section--blue  { background: var(--brand-primary); }

.section--navy, .section--blue { color: var(--text-on-dark-muted); }
.section--navy h1, .section--navy h2, .section--navy h3, .section--navy h4,
.section--blue h1, .section--blue h2, .section--blue h3, .section--blue h4 { color: var(--text-on-dark); }

/* ---- grid helpers ------------------------------------------------------- */
.grid { display: grid; gap: var(--s-4); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

@media (max-width: 1199px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 767px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

.stack > * + * { margin-top: var(--s-2); }
.stack-3 > * + * { margin-top: var(--s-3); }
.stack-4 > * + * { margin-top: var(--s-4); }

.lede {
  font-size: var(--fs-lede);
  line-height: 1.6;
  color: var(--text-body);
  max-width: 62ch;
}
.section--navy .lede, .section--blue .lede { color: var(--text-on-dark-muted); }

.measure { max-width: 62ch; }
.center { text-align: center; margin-inline: auto; }

/* ============================================================================
   The logo mark
   Rendered as a CSS mask so a single traced SVG can be painted in any brand
   colour, at any size, and animated — rather than shipping one PNG per colour.
   ========================================================================== */
.bear {
  display: block;
  aspect-ratio: var(--bear-ratio);
  background-color: currentColor;
  -webkit-mask-image: url(../assets/logos/bear.svg);
          mask-image: url(../assets/logos/bear.svg);
  -webkit-mask-repeat: no-repeat;   mask-repeat: no-repeat;
  -webkit-mask-position: center;    mask-position: center;
  -webkit-mask-size: contain;       mask-size: contain;
}
/* Below ~48px the continent line work disappears; swap to the simplified mark. */
.bear--simple {
  aspect-ratio: var(--bear-simple-ratio);
  -webkit-mask-image: url(../assets/logos/bear-simple.svg);
          mask-image: url(../assets/logos/bear-simple.svg);
}

/* ---- the full lockup: mark over a two-line wordmark split by a gold rule -- */
.lockup { display: inline-flex; flex-direction: column; align-items: center; gap: var(--s-2); }
.lockup .bear { width: var(--lockup-mark, 140px); }
.lockup__word {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--lockup-word, .8125rem);
  letter-spacing: .16em;
  line-height: 1.55;
  text-align: center;
  text-transform: uppercase;
  color: currentColor;
}
.lockup__word span { display: block; }
.lockup__word span:first-child {
  padding-bottom: 3px;
  border-bottom: 2px solid var(--brand-accent);
}

/* ============================================================================
   Motion primitives
   Reveals only hide content when JS is running, so a failed script can never
   leave the page blank.
   ========================================================================== */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(var(--reveal-travel));
  transition: opacity var(--dur-slow) var(--ease-out) var(--reveal-delay, 0ms),
              transform var(--dur-slow) var(--ease-out) var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
.js [data-reveal].is-visible { opacity: 1; transform: none; will-change: auto; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js [data-reveal] { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}