/* Shared base: reset, type, layout, header, footer, buttons.
   Theme tokens only. No hard-coded colours or fonts here (see docs/DESIGN.md). */

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

/* Hidden always wins, whatever display a component sets. */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--font-size-body-phone);
  line-height: var(--line-height-body);
}
@media (min-width: 640px) {
  body { font-size: var(--font-size-body); }
}

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-stretch: var(--display-stretch);
  font-weight: var(--heading-weight);
  line-height: 1.15;
  margin: 0;
}
h1 {
  font-weight: var(--display-weight);
  font-size: clamp(2.25rem, 6vw, 4rem);
  line-height: 1.03;
  letter-spacing: var(--display-tracking);
}
h2 { font-size: clamp(1.4rem, 3vw, 1.75rem); }
h3 { font-size: clamp(1.4rem, 2.4vw, 1.75rem); }
p { margin: 0; }

a { color: var(--color-primary); text-underline-offset: 3px; }
a:hover { color: var(--color-primary-strong); }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: calc(75rem + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
:root { --gutter: 1rem; }
@media (min-width: 960px) { :root { --gutter: 4.5rem; } }

.stack { display: flex; flex-direction: column; gap: 1.5rem; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: var(--radius-control);
}
.skip-link:focus { top: 1rem; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
}

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

/* Header and hero share the header band colours. */
.site-header { background: var(--color-header-bg); color: var(--color-header-text); }
.site-header__inner { min-height: 3.75rem; display: flex; align-items: center; justify-content: space-between; }
.wordmark {
  font-family: var(--font-display);
  font-stretch: var(--display-stretch);
  font-weight: var(--display-weight);
  font-size: 1.5rem;
  letter-spacing: var(--display-tracking);
  color: var(--color-wordmark);
  text-decoration: none;
  padding-block: 0.5rem;
}
.wordmark:hover { color: var(--color-wordmark); }

.hero { background: var(--color-header-bg); color: var(--color-header-text); padding-block: 1.25rem 2.5rem; }
.hero__inner { display: grid; gap: 2rem; align-items: center; }
.hero__text { display: flex; flex-direction: column; gap: 1rem; max-width: 46rem; }
.hero .eyebrow { color: var(--color-header-accent); }
.hero__lede { font-size: 1.125em; color: var(--color-header-muted); }
.hero__graphic { justify-self: center; width: min(100%, 15rem); }
@media (min-width: 640px) { .hero__graphic { width: min(100%, 26rem); } }
@media (min-width: 960px) {
  .hero { padding-block: 4rem; }
  .hero__inner { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 3rem; }
}

.section { padding-block: 2.5rem; }
@media (min-width: 960px) { .section { padding-block: 4rem; } }
.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  padding-bottom: 0.75rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--color-border);
}
.section__index { font-family: var(--font-mono); font-size: 0.8125rem; letter-spacing: 0.12em; color: var(--color-primary); }
.section__aside { font-size: 0.9375rem; color: var(--color-text-muted); }

.site-footer {
  margin-top: 3rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}
.site-footer__inner { padding-block: 2rem; display: flex; flex-direction: column; gap: 1rem; }

/* Buttons. Primary, secondary, text. 48px minimum tap target. */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  min-height: 3rem;
  padding: 0 1.375rem;
  border: 0;
  border-radius: var(--radius-button);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}
.btn--primary { background: var(--color-primary); color: var(--color-primary-contrast); }
.btn--primary:hover { background: var(--color-primary-strong); color: var(--color-primary-contrast); }
.btn--secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: inset 0 0 0 2px var(--color-primary);
}
.btn--secondary:hover { color: var(--color-primary-strong); box-shadow: inset 0 0 0 2px var(--color-primary-strong); }
.btn--text { padding: 0 0.375rem; background: none; color: var(--color-text); text-decoration: underline; text-underline-offset: 4px; }
.btn--header { background: var(--color-header-cta-bg); color: var(--color-header-cta-text); }
.btn--header:hover { color: var(--color-header-cta-text); filter: brightness(1.05); }
.btn[disabled] { background: var(--color-soon-bg); color: var(--color-soon-text); box-shadow: none; cursor: not-allowed; }
.btn--block { width: 100%; }
@media (max-width: 639px) { .btn--block-phone { width: 100%; } }

/* Main navigation. Wide screens: links beside the brand. Narrow screens: a
   Menu button (nav.js) shows the links in a panel; without JavaScript the
   links wrap onto their own row, so they're always reachable. */
.site-header__inner { flex-wrap: wrap; column-gap: 1rem; }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.25rem; }
.nav-toggle { display: inline-flex; align-items: center; gap: 0.5rem; min-height: 2.75rem; padding: 0 0.875rem; border: 1px solid var(--color-header-muted); border-radius: var(--radius-control); background: transparent; color: var(--color-header-text); font: inherit; font-weight: 700; cursor: pointer; }
.nav-toggle__bars { position: relative; width: 1.125rem; height: 2px; background: currentColor; box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor; }
.nav-open .nav-toggle__bars { box-shadow: none; background: transparent; }
.nav-open .nav-toggle__bars::before, .nav-open .nav-toggle__bars::after { content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 2px; background: currentColor; transform: rotate(45deg); }
.nav-open .nav-toggle__bars::after { transform: rotate(-45deg); }
@media (max-width: 639.98px) {
  .site-nav { flex-basis: 100%; padding-bottom: 0.25rem; }
  .site-nav ul { margin-inline: -0.75rem; }
  .has-nav-toggle .site-nav { display: none; }
  .has-nav-toggle.nav-open .site-nav { display: block; padding-bottom: 0.75rem; border-top: 1px solid var(--color-header-muted); }
  .has-nav-toggle.nav-open .site-nav ul { flex-direction: column; margin-inline: 0; padding-top: 0.5rem; }
  .has-nav-toggle.nav-open .site-nav a { width: 100%; padding-inline: 0.25rem; }
}
@media (min-width: 640px) { .nav-toggle { display: none; } }
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0 0.75rem;
  border-radius: var(--radius-control);
  color: var(--color-header-text);
  font-weight: 700;
  text-decoration: none;
}
.site-nav a:hover { color: var(--color-header-text); text-decoration: underline; text-underline-offset: 4px; }
.site-nav a[aria-current] { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 6px; }
.section__more { margin-top: 1.5rem; }