/* ==========================================================================
   Light Astra — layout
   Containers and grids, the header and its navigation, sections and their
   heads, page heroes for inner pages, the footer. Mobile-first; the
   breakpoint overrides live in responsive.css.
   ========================================================================== */

/* ---- containers ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: calc(var(--container) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--wide {
  max-width: calc(var(--container-wide) + 2 * var(--gutter));
}

.container--narrow {
  max-width: calc(var(--container-narrow) + 2 * var(--gutter));
}

.container--text {
  max-width: calc(var(--container-text) + 2 * var(--gutter));
}

/* ---- grids ------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--grid-gap, var(--space-5));
  grid-template-columns: repeat(var(--cols, 1), minmax(0, 1fr));
}

/* Columns separated by hairlines: three pillars, four steps, spec rows. */
.grid--ruled {
  gap: 0;
}

.grid--ruled > * {
  padding-block: var(--space-5);
  border-top: var(--border);
}

.grid--ruled > *:first-child {
  border-top: 0;
}

/* Two-column editorial split: a sticky title column and a reading column. */
.split {
  display: grid;
  gap: var(--space-6);
}

.split__aside {
  align-self: start;
}

/* ---- header ---------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}

/* The frosted milk is a pseudo-element: a backdrop-filter on the header itself would make it
   the containing block of the phone menu sheet (position: fixed) and collapse the sheet. */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgb(246 242 234 / 0.88);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  backdrop-filter: saturate(140%) blur(14px);
}

.site-header.is-scrolled {
  border-bottom-color: var(--hairline);
  box-shadow: 0 12px 32px -24px rgb(16 16 20 / 0.35);
}

.site-header__bar {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  grid-template-areas: "brand . cta toggle";
  align-items: center;
  gap: var(--space-3);
  min-height: var(--header-h);
}

.brand {
  grid-area: brand;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-height: var(--target);
  text-decoration: none;
  color: var(--ink);
}

.brand__star {
  width: 1.75rem;
  height: 1.75rem;
  transition: transform var(--dur-slow) var(--ease-out);
}

.brand:hover .brand__star {
  transform: rotate(90deg) scale(1.06);
}

/* The LIGHT ASTRA text row of the square lockup (960px artwork: 780 x 54 at 94, 812),
   cropped so the real wordmark is legible beside the star at every header size. */
.brand__word {
  --word-w: 8rem;
  position: relative;
  display: block;
  width: var(--word-w);
  aspect-ratio: 780 / 54;
  overflow: hidden;
}

.brand__word-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 123.08%;
  max-width: none;
  height: auto;
  margin-top: -104.1%;
  margin-left: -12.05%;
}

@media (min-width: 600px) {
  .brand__word {
    --word-w: 10.2rem;
  }
}

.site-header__cta {
  grid-area: cta;
}

/* 44px pointer target even as a small button (outranks .btn--sm, which loads later). */
.site-header__cta.btn--sm {
  min-height: var(--target);
}

.site-header__cta-prefix {
  display: none;
}

.menu-toggle {
  grid-area: toggle;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-height: var(--target);
  padding: 0 0.25rem 0 0.75rem;
  border: 0;
  background: none;
  color: var(--ink);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.menu-toggle__icon {
  position: relative;
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
}

.menu-toggle__icon span {
  position: absolute;
  left: 2px;
  right: 2px;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-fast) var(--ease-out);
}

.menu-toggle__icon span:first-child {
  top: 8px;
}

.menu-toggle__icon span:last-child {
  top: 15px;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* Without JavaScript the navigation is a plain row under the bar and the button is gone. */
html:not(.js) .menu-toggle {
  display: none;
}

.site-nav {
  grid-column: 1 / -1;
  padding-block: var(--space-3) var(--space-4);
  border-top: var(--border);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: var(--target);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.55rem;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}

.site-nav__link:hover {
  color: var(--ink);
}

.site-nav__link:hover::after,
.site-nav__link[aria-current]::after {
  transform: scaleX(1);
}

.site-nav__foot {
  display: none;
}

.site-nav__meta {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--ink-3);
}

/* With JavaScript: closed by default, a sheet when open (responsive.css shapes it per width). */
html.js .site-nav {
  display: none;
}

html.js .site-header.is-menu-open .site-nav {
  display: flex;
  flex-direction: column;
}

html.js .is-menu-open .site-nav__foot {
  display: block;
}

/* ---- sections ----------------------------------------------------------------- */
.section {
  position: relative;
  padding-block: var(--section-y);
  background: var(--surface);
  overflow-x: clip;    /* watermarks may hang past the edge; clip (not hidden) keeps sticky children working */
}

/* A section that opens with the star rule: the rule sits just inside its top edge. */
.section--divided {
  padding-top: var(--space-4);
}

.section__rule {
  margin-bottom: var(--section-y);
}

.section--soft {
  --surface: var(--milk-soft);
}

.section--deep {
  --surface: var(--milk-deep);
}

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

.section--flush-top {
  padding-top: 0;
}

.section--flush-bottom {
  padding-bottom: 0;
}

.section--ruled {
  border-top: var(--border);
}

.section__head {
  max-width: var(--container-narrow);
  margin-bottom: clamp(2.5rem, 2rem + 3vw, 4.5rem);
}

.section__head > * + * {
  margin-top: var(--space-4);
}

.section__head .eyebrow + .section__title {
  margin-top: var(--space-4);
}

.section__title {
  font-size: var(--display-2);
}

.section__lead {
  max-width: var(--container-text);
  font-size: var(--text-lg);
  color: var(--ink-2);
}

/* A head that becomes two columns on desktop: title left, lead and link right. */
.section__head--split {
  max-width: none;
  display: grid;
  gap: var(--space-4) var(--space-7);
}

.section__head--split > * + * {
  margin-top: 0;
}

.section__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4) var(--space-6);
  margin-top: clamp(2.5rem, 2rem + 3vw, 4rem);
  padding-top: var(--space-5);
  border-top: var(--border);
}

/* ---- page hero (inner pages) ---------------------------------------------------- */
.page-hero {
  position: relative;
  padding-block: clamp(3rem, 2rem + 5vw, 7rem) clamp(2.5rem, 2rem + 3vw, 5rem);
  background: var(--surface);
  overflow: hidden;
}

.page-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-5);
}

.page-hero__title {
  max-width: 16ch;
  font-size: var(--display-1);
}

.page-hero__lead {
  max-width: var(--container-text);
  font-size: var(--text-xl);
  line-height: 1.45;
  color: var(--ink-2);
}

.page-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  color: var(--ink-3);
}

/* A centred variant: the not-found page, a thank-you page, any short page with one message.
   It needs no page stylesheet, so it stays valid at any URL depth. */
.page-hero--center {
  display: grid;
  align-items: center;
  min-height: calc(100vh - var(--header-h));
  min-height: calc(100svh - var(--header-h));
  padding-block: clamp(3rem, 2rem + 4vw, 6rem);
  text-align: center;
}

.page-hero--center .page-hero__inner {
  position: relative;
  z-index: 1;
  justify-items: center;
}

.page-hero__brand {
  width: min(100%, 40rem);
  height: auto;
  margin-bottom: var(--space-4);
}

.page-hero--center .page-hero__title {
  max-width: 14ch;
  font-size: var(--display-2);
}

.page-hero--center .page-hero__lead {
  max-width: 44ch;
}

.page-hero--center .actions {
  justify-content: center;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: var(--text-sm);
  color: var(--ink-3);
}

.breadcrumbs a {
  text-decoration: none;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--ink-4);
}

/* ---- footer ----------------------------------------------------------------------- */
.site-footer {
  --surface: var(--milk-deep);
  background: var(--surface);
  border-top: var(--border);
  padding-block: clamp(3rem, 2.5rem + 3vw, 5rem) var(--space-6);
  font-size: var(--text-sm);
  color: var(--ink-3);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-7) var(--space-5);
}

.site-footer__brand {
  grid-column: 1 / -1;
}

.site-footer__brand > * + * {
  margin-top: var(--space-3);
}

.site-footer__lockup {
  width: 7rem;
  height: 7rem;
  margin-left: -0.5rem;    /* optical: the star's left ray sits on the column edge */
}

.site-footer__tagline {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--ink);
}

.site-footer__line {
  max-width: 32ch;
  color: var(--ink-2);
}

.site-footer__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.75rem;
}

.site-footer__facts li + li::before {
  content: "·";
  margin-right: 0.75rem;
  color: var(--ink-4);
}

.site-footer__contact a {
  color: var(--ink);
  font-weight: 600;
}

.site-footer__heading {
  margin-bottom: var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--ink);
}

.site-footer__col + .site-footer__col {
  margin-top: 0;
}

.site-footer__subnav {
  margin-top: var(--space-5);
}

.site-footer__links li a {
  display: inline-flex;
  align-items: center;
  min-height: 2.25rem;
  color: var(--ink-2);
  text-decoration: none;
}

.site-footer__links li a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2) var(--space-5);
  margin-top: clamp(2.5rem, 2rem + 3vw, 4rem);
  padding-top: var(--space-5);
  border-top: var(--border);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.site-footer__base a {
  text-decoration: none;
}