/* ============================================================================
   VÆLARUM — Layout
   Page-level structure: header, nav, footer, container grid, sections.
   ============================================================================ */

/* ---------- Containers ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--space-6); }
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--prose {
  max-width: var(--container-prose);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border-1);
  min-height: var(--header-h);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  min-height: var(--header-h);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--text-1);
  font-family: var(--font-mono);
  font-weight: var(--fw-bold);
  font-size: var(--fs-100);
  letter-spacing: var(--tracking-wide);
}

.site-brand:hover { color: var(--brand-x-dark); }

.site-brand__mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.site-brand__name {
  /* Æ ligature respected by font; no text-transform to avoid breaking it */
  font-feature-settings: "kern" 1, "liga" 1;
}

/* ---------- Primary Nav ---------- */
.primary-nav {
  display: none;
}

.primary-nav__list {
  display: flex;
  gap: var(--space-5);
  list-style: none;
  padding: 0;
  margin: 0;
}

.primary-nav__list li {
  margin: 0;
}

.primary-nav__link {
  display: inline-block;
  padding: var(--space-2) var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--fs-75);
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-wide);
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}

.primary-nav__link:hover {
  color: var(--brand-x-dark);
  border-bottom-color: var(--brand);
}

.primary-nav__link[aria-current="page"] {
  color: var(--brand-x-dark);
  border-bottom-color: var(--brand);
}

@media (min-width: 900px) {
  .primary-nav { display: block; }
}

/* ---------- Mobile nav toggle ---------- */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-sm);
  color: var(--text-1);
}

.nav-toggle:hover { background: var(--surface-1); }
.nav-toggle:focus-visible { outline: none; box-shadow: var(--focus-ring); }

@media (min-width: 900px) {
  .nav-toggle { display: none; }
}

/* Mobile nav drawer */
.mobile-nav {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  background: var(--surface-0);
  z-index: calc(var(--z-header) - 1);
  padding: var(--space-6) var(--space-5);
  transform: translateY(-100%);
  transition: transform var(--dur-base) var(--ease-out);
  visibility: hidden;
  border-bottom: 1px solid var(--border-1);
}

.mobile-nav[data-open="true"] {
  transform: translateY(0);
  visibility: visible;
}

.mobile-nav .primary-nav__list {
  flex-direction: column;
  gap: var(--space-3);
}

.mobile-nav .primary-nav__link {
  font-size: var(--fs-125);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border-1);
}

@media (min-width: 900px) {
  .mobile-nav { display: none; }
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--space-10);
  background: var(--brand-x-dark);
  color: var(--text-inverse);
  padding-block: var(--space-8) var(--space-6);
}

.site-footer a {
  color: var(--text-inverse);
  text-decoration-color: rgba(240, 242, 245, 0.3);
}

.site-footer a:hover {
  text-decoration-color: currentColor;
  color: #fff;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
  padding-bottom: var(--space-7);
  border-bottom: 1px solid rgba(240, 242, 245, 0.12);
}

@media (min-width: 720px) {
  .site-footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
  }
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.site-footer__brand .site-brand {
  color: var(--text-inverse);
}

.site-footer__brand .site-brand:hover {
  color: #fff;
}

.site-footer__tag {
  font-size: var(--fs-75);
  color: rgba(240, 242, 245, 0.65);
  max-width: 28ch;
  line-height: var(--lh-base);
}

.site-footer h2 {
  font-family: var(--font-mono);
  font-size: var(--fs-75);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: rgba(240, 242, 245, 0.65);
  margin-bottom: var(--space-3);
}

.site-footer__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: var(--fs-75);
}

.site-footer__list a {
  text-decoration: none;
}
.site-footer__list a:hover {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.site-footer__meta {
  padding-top: var(--space-5);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-5);
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: var(--fs-50);
  color: rgba(240, 242, 245, 0.5);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

/* ---------- Sections ---------- */
.section {
  padding-block: var(--space-8);
}

@media (min-width: 768px) {
  .section { padding-block: var(--space-9); }
}

.section--alt {
  background: var(--surface-1);
}

.section--dark {
  background: var(--brand-x-dark);
  color: var(--text-inverse);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4,
.section--dark h5,
.section--dark h6 {
  color: var(--text-inverse);
}

.section--dark a {
  color: var(--text-inverse);
}

.section__eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-50);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--brand-mid);
  margin-bottom: var(--space-3);
}

.section--dark .section__eyebrow {
  color: rgba(240, 242, 245, 0.6);
}

.section__header {
  max-width: var(--container-narrow);
  margin-bottom: var(--space-7);
}

.section__lede {
  font-size: var(--fs-125);
  color: var(--text-2);
  line-height: var(--lh-relaxed);
  margin-top: var(--space-4);
  max-width: 54ch;
}

.section--dark .section__lede {
  color: rgba(240, 242, 245, 0.78);
}

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(ellipse at 80% -20%, rgba(58, 68, 82, 0.55) 0%, transparent 50%),
    radial-gradient(ellipse at -10% 110%, rgba(75, 112, 81, 0.18) 0%, transparent 50%),
    var(--brand-x-dark);
  color: var(--text-inverse);
  padding-block: var(--space-9) var(--space-9);
  position: relative;
  overflow: hidden;
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
  align-items: end;
}

@media (min-width: 960px) {
  .hero__inner {
    grid-template-columns: 1.6fr 1fr;
    gap: var(--space-8);
  }
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--fs-50);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: rgba(240, 242, 245, 0.65);
  margin-bottom: var(--space-5);
}

.hero__eyebrow::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 1px;
  background: rgba(240, 242, 245, 0.65);
}

.hero__title {
  font-size: clamp(2.5rem, 5.5vw, 4.5rem);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-5);
  color: #fff;
}

.hero__lede {
  font-size: clamp(1.05rem, 1.4vw, 1.25rem);
  line-height: var(--lh-relaxed);
  color: rgba(240, 242, 245, 0.82);
  max-width: 56ch;
  margin-bottom: var(--space-6);
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
  border-top: 1px solid rgba(240, 242, 245, 0.18);
  padding-top: var(--space-5);
}

@media (min-width: 600px) {
  .hero__meta {
    grid-template-columns: repeat(3, 1fr);
  }
}

.hero__metric {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.hero__metric-value {
  font-family: var(--font-mono);
  font-size: var(--fs-300);
  font-weight: var(--fw-bold);
  color: #fff;
  font-variant-numeric: tabular-nums lining-nums;
  letter-spacing: var(--tracking-tight);
}

.hero__metric-label {
  font-family: var(--font-mono);
  font-size: var(--fs-50);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: rgba(240, 242, 245, 0.6);
}

/* ---------- Grids ---------- */
.grid {
  display: grid;
  gap: var(--space-5);
}

.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: 1fr; }

@media (min-width: 600px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }
  .grid--2 { gap: var(--space-7); }
}

/* ---------- Pages with prose content ---------- */
.prose-page {
  padding-block: var(--space-8) var(--space-9);
}

.prose-page__header {
  margin-bottom: var(--space-7);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border-1);
}

.prose-page__title {
  font-size: clamp(2.25rem, 4vw, 3.5rem);
  margin-bottom: var(--space-4);
}

.prose-page__sub {
  font-size: var(--fs-125);
  color: var(--text-2);
  max-width: 60ch;
  line-height: var(--lh-relaxed);
}

.prose-page__body > * + * {
  margin-top: var(--space-5);
}

.prose-page__body h2 {
  font-size: var(--fs-300);
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border-1);
}

.prose-page__body h3 {
  font-size: var(--fs-200);
  margin-top: var(--space-6);
}

.prose-page__body p,
.prose-page__body ul,
.prose-page__body ol {
  max-width: var(--container-prose);
}