/* ============================================================
   LAYOUT — container, sections, header, menu, footer shell
   ============================================================ */

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

.section {
  position: relative;
  z-index: var(--z-content);
  padding-block: var(--section-y);
  border-top: 1px solid var(--line);
}
.section:first-of-type { border-top: none; }

/* Section heading block ------------------------------------ */
.sec-head {
  display: grid;
  gap: var(--s-5);
  margin-bottom: clamp(var(--s-7), 6vw, var(--s-9));
}
.sec-head__idx {
  color: var(--fg-faint);
  display: flex;
  align-items: center;
  gap: var(--s-3);
}
.sec-head__idx::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
  max-width: 220px;
}
.sec-head__title {
  font-size: var(--fs-xl);
  line-height: var(--lh-tight);
  max-width: 18ch;
}
.sec-head__title--xl {
  font-size: var(--fs-2xl);
  max-width: 12ch;
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-header);
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-5);
  padding-inline: var(--gutter);
  mix-blend-mode: difference;
  transition: transform var(--d-base) var(--e-out);
}
/* Set by JS when scrolling down past the fold */
.header.is-hidden { transform: translateY(-100%); }

/* Backdrop appears once past hero; blend mode is dropped so
   the plate reads correctly against light sections. */
.header.is-solid {
  mix-blend-mode: normal;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-sm);
  letter-spacing: -0.02em;
}
.brand__mark {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  transition: transform var(--d-base) var(--e-back);
}
.brand__mark svg { width: 100%; height: 100%; }
.brand:hover .brand__mark { transform: rotate(-90deg); }

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(var(--s-4), 2vw, var(--s-6));
}
.nav__list a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45em;
  font-size: var(--fs-sm);
  color: var(--fg-mute);
  padding-block: var(--s-2);
  transition: color var(--d-fast) var(--e-out);
}
.nav__idx {
  font-size: 0.62em;
  color: var(--fg-faint);
  transition: color var(--d-fast) var(--e-out);
}
.nav__list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: 100% 50%;
  transition: transform var(--d-base) var(--e-out);
}
.nav__list a:hover,
.nav__list a.is-active { color: var(--fg); }
.nav__list a:hover .nav__idx,
.nav__list a.is-active .nav__idx { color: var(--fg); }
.nav__list a:hover::after,
.nav__list a.is-active::after {
  transform: scaleX(1);
  transform-origin: 0 50%;
}

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

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  place-items: center;
  gap: 5px;
  flex-direction: column;
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--fg);
  transition: transform var(--d-base) var(--e-inout), opacity var(--d-fast) linear;
}
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.25px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child  { transform: translateY(-3.25px) rotate(-45deg); }

/* ============================================================
   MOBILE MENU
   ============================================================ */
.menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--s-8);
  padding: var(--header-h) var(--gutter) var(--s-7);
  clip-path: inset(0 0 100% 0);
  transition: clip-path var(--d-slow) var(--e-inout);
  pointer-events: none;
}
.menu.is-open {
  clip-path: inset(0 0 0 0);
  pointer-events: auto;
}
.menu__nav { display: grid; gap: var(--s-2); }
.menu__nav a {
  display: flex;
  align-items: baseline;
  gap: var(--s-4);
  font-family: var(--font-display);
  font-size: clamp(2rem, 11vw, 3.6rem);
  font-weight: 500;
  letter-spacing: var(--tr-tight);
  line-height: 1.1;
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--d-base) var(--e-out), transform var(--d-base) var(--e-out);
}
.menu__nav a .mono { color: var(--fg-faint); font-size: 0.8rem; }
.menu.is-open .menu__nav a { opacity: 1; transform: none; }
.menu.is-open .menu__nav a:nth-child(1) { transition-delay: 0.16s; }
.menu.is-open .menu__nav a:nth-child(2) { transition-delay: 0.22s; }
.menu.is-open .menu__nav a:nth-child(3) { transition-delay: 0.28s; }
.menu.is-open .menu__nav a:nth-child(4) { transition-delay: 0.34s; }
.menu.is-open .menu__nav a:nth-child(5) { transition-delay: 0.40s; }
.menu.is-open .menu__nav a:nth-child(6) { transition-delay: 0.46s; }

.menu__foot {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-5);
  color: var(--fg-faint);
  border-top: 1px solid var(--line);
  padding-top: var(--s-5);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  position: relative;
  z-index: var(--z-content);
  border-top: 1px solid var(--line);
  padding-top: var(--s-8);
  overflow: hidden;
}
.footer__in { display: grid; gap: var(--s-8); }

.footer__word {
  overflow: hidden;
  white-space: nowrap;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.4rem, 11vw, 9rem);
  line-height: 1;
  letter-spacing: var(--tr-tight);
  color: transparent;
  -webkit-text-stroke: 1px var(--c-line-hard);
  user-select: none;
}
/* The marquee needs a block box with intrinsic width — an inline span
   reports scrollWidth 0 and would never duplicate. */
.footer__word > [data-marquee] {
  display: block;
  width: max-content;
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--s-6);
}
.footer__k {
  display: block;
  color: var(--fg-faint);
  margin-bottom: var(--s-4);
}
.footer__cols ul { display: grid; gap: var(--s-2); }
.footer__cols a {
  font-size: var(--fs-sm);
  color: var(--fg-mute);
  transition: color var(--d-fast) var(--e-out), padding-left var(--d-fast) var(--e-out);
}
.footer__cols a:hover { color: var(--fg); padding-left: 6px; }

.footer__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  padding-block: var(--s-5);
  border-top: 1px solid var(--line);
  color: var(--fg-faint);
}
.footer__top { font: inherit; color: inherit; transition: color var(--d-fast) var(--e-out); }
.footer__top:hover { color: var(--fg); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .nav { display: none; }
  .menu-toggle { display: flex; }
}

@media (max-width: 640px) {
  :root { --header-h: 64px; }
  .header__actions .btn--sm { display: none; }
  .sec-head__title { max-width: none; }
}