/* ==========================================================================
   Layout — container, section rhythm, nav, mobile menu, footer
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

section[id] {
  scroll-margin-top: 88px;
}

.section {
  padding-block: var(--section-pad);
  border-top: 1px solid var(--border);
}

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

.section__head {
  max-width: 46rem;
  margin-bottom: var(--space-10);
}

.section__head--wide {
  max-width: 62rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 1px;
  background: var(--accent);
  flex: none;
}

.section__title {
  font-size: var(--text-h2);
  max-width: 22ch;
}

.section__intro {
  margin-top: var(--space-5);
  font-size: var(--text-lead);
  color: var(--text-secondary);
  max-width: 54ch;
}

/* ---------------------------------- Nav ---------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: rgba(10, 10, 11, 0.7);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease-out), background var(--dur-base) var(--ease-out);
}

.nav[data-scrolled="true"] {
  border-bottom-color: var(--border);
  background: rgba(10, 10, 11, 0.92);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  height: 80px;
}

.nav__logo {
  display: flex;
  align-items: center;
  flex: none;
}

.nav__logo img {
  height: 34px;
  width: auto;
  transition: opacity var(--dur-base) var(--ease-out);
}

.nav__logo:hover img,
.nav__logo:focus-visible img {
  opacity: 0.8;
}

.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-8);
  font-size: var(--text-small);
  font-weight: 500;
}

.nav__links a {
  position: relative;
  color: var(--text-secondary);
  padding-block: var(--space-2);
  transition: color var(--dur-fast) var(--ease-out);
}

.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transition: right var(--dur-base) var(--ease-out);
}

.nav__links a:hover,
.nav__links a:focus-visible {
  color: var(--text-primary);
}

.nav__links a:hover::after,
.nav__links a:focus-visible::after {
  right: 0;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--tracking-wide);
  color: var(--text-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-1);
  min-height: 32px;
}

.lang-toggle__opt {
  padding: 3px var(--space-2);
  border-radius: 2px;
  color: var(--text-tertiary);
  transition: color var(--dur-fast), background var(--dur-fast);
  min-width: 30px;
  text-align: center;
}

.lang-toggle__opt:hover,
.lang-toggle__opt:focus-visible {
  color: var(--text-primary);
}

.lang-toggle__opt[aria-pressed="true"] {
  color: var(--text-on-accent);
  background: var(--text-primary);
}

.lang-toggle__opt[aria-pressed="true"]:hover {
  color: var(--text-on-accent);
}

.nav__actions .nav__cta {
  display: none;
}

.nav__burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  flex: none;
  transition: opacity var(--dur-fast) var(--ease-out);
}

.nav__burger:hover,
.nav__burger:focus-visible {
  opacity: 0.65;
}

.nav__burger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text-primary);
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}

.nav__burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (min-width: 960px) {
  .nav__links {
    display: flex;
  }

  .nav__actions .nav__cta {
    display: inline-flex;
  }

  .nav__burger {
    display: none;
  }
}

/* Mobile menu: sibling of <header>, NOT nested — an ancestor using
   backdrop-filter creates a new containing block for fixed descendants,
   which breaks position:fixed positioning/opacity. Keeping this element
   outside the blurred header avoids that entirely. */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-mobile-menu);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  padding: var(--space-6) var(--container-pad) var(--space-10);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--dur-slow) var(--ease-in-out), opacity var(--dur-base) var(--ease-out), visibility 0s linear var(--dur-slow);
}

.mobile-menu[data-open="true"] {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  transition: transform var(--dur-slow) var(--ease-in-out), opacity var(--dur-base) var(--ease-out), visibility 0s;
}

@media (prefers-reduced-motion: reduce) {
  .mobile-menu {
    transition: opacity var(--dur-fast) linear, visibility 0s linear var(--dur-fast);
  }
  .mobile-menu[data-open="true"] {
    transition: opacity var(--dur-fast) linear, visibility 0s;
  }
}

.mobile-menu__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  flex: none;
}

.mobile-menu__close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}

.mobile-menu__close:hover,
.mobile-menu__close:focus-visible {
  color: var(--accent);
  transform: rotate(90deg);
}

.mobile-menu__links {
  display: flex;
  flex-direction: column;
  margin-top: var(--space-8);
  gap: var(--space-1);
}

.mobile-menu__links a {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 2.75rem);
  font-weight: 600;
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  transition: color var(--dur-fast) var(--ease-out), padding-left var(--dur-base) var(--ease-out);
}

.mobile-menu__links a:hover,
.mobile-menu__links a:focus-visible {
  color: var(--accent);
  padding-left: var(--space-3);
}

.mobile-menu__footer {
  margin-top: auto;
  padding-top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

@media (min-width: 960px) {
  .mobile-menu {
    display: none;
  }
}

/* --------------------------------- Footer -------------------------------- */

.footer {
  border-top: 1px solid var(--border);
  padding-block: var(--space-8);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.footer__logo img {
  height: 22px;
  width: auto;
  opacity: 0.85;
  transition: opacity var(--dur-base) var(--ease-out);
}

.footer__logo:hover img,
.footer__logo:focus-visible img {
  opacity: 1;
}

.footer__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  font-size: var(--text-small);
  color: var(--text-secondary);
}

.footer__links a {
  transition: color var(--dur-fast) var(--ease-out);
}

.footer__links a:hover,
.footer__links a:focus-visible {
  color: var(--text-primary);
}

.footer__meta {
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  color: var(--text-tertiary);
  letter-spacing: var(--tracking-wide);
}