/* ============================================================
   layout.css — page frame, grid primitives, header, menu
   ============================================================ */

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

.section { position: relative; padding-block: calc(var(--section-space) * 0.55); }
.section--first { padding-top: var(--section-space); }

.section-head {
  display: flex;
  flex-direction: column;
  gap: 22px;
  margin-bottom: clamp(44px, 6vw, 90px);
}

/* ---------- site header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-header);
  height: calc(var(--header-h) + 18px);
  display: flex;
  align-items: center;
  pointer-events: none;
  transition:
    transform var(--duration-medium) var(--ease-out-quart),
    border-color var(--duration-medium) ease;
  border-bottom: 1px solid transparent;
}
.site-header.is-hidden { transform: translateY(-101%); }

.site-header__inner {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  min-height: 58px;
  padding: 0 var(--page-gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  pointer-events: auto;
  border: 1px solid transparent;
  border-radius: 999px;
  background: rgba(5, 5, 5, 0);
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  backdrop-filter: blur(0);
  transition:
    width 620ms var(--ease-out-expo),
    max-width 620ms var(--ease-out-expo),
    min-height 520ms var(--ease-out-expo),
    padding 520ms var(--ease-out-expo),
    background 420ms ease,
    border-color 420ms ease,
    box-shadow 420ms ease,
    backdrop-filter 420ms ease;
}
.site-header.is-scrolled .site-header__inner {
  width: max-content;
  max-width: calc(100vw - 32px);
  min-height: 54px;
  padding: 6px 10px 6px 14px;
  justify-content: center;
  gap: 22px;
  border-color: rgba(255, 255, 255, 0.13);
  background: rgba(7, 7, 7, 0.84);
  box-shadow:
    0 22px 70px rgba(0, 0, 0, 0.34),
    inset 0 1px 0 rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(22px) saturate(1.25);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  min-width: 0;
  transition: gap 420ms var(--ease-out-expo), color 220ms ease;
}
.brand-mark svg {
  width: 30px;
  height: 30px;
  filter: drop-shadow(0 0 16px rgba(255,255,255,0.14));
  transition: width 420ms var(--ease-out-expo), height 420ms var(--ease-out-expo);
}
.brand-mark span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--silver);
  white-space: nowrap;
  transition:
    opacity 260ms ease,
    transform 420ms var(--ease-out-expo),
    max-width 420ms var(--ease-out-expo);
  max-width: 220px;
  overflow: hidden;
}
.site-header.is-scrolled .brand-mark { gap: 0; }
.site-header.is-scrolled .brand-mark svg { width: 26px; height: 26px; }
.site-header.is-scrolled .brand-mark span {
  opacity: 0;
  transform: translateX(-8px);
  max-width: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.4vw, 36px);
  transition: gap 420ms var(--ease-out-expo);
}
.site-header.is-scrolled .site-nav { gap: 6px; }

.site-nav__link {
  position: relative;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray);
  padding: 8px 0;
  overflow: hidden;
  border-radius: 999px;
  line-height: 1;
  transition:
    color var(--duration-fast) ease,
    background var(--duration-fast) ease,
    padding 420ms var(--ease-out-expo);
}
.site-header.is-scrolled .site-nav__link { padding: 11px 14px; }
.site-nav__link .swap {
  display: block;
  position: relative;
  overflow: hidden;
  line-height: 1;
}
.site-nav__link .swap > span {
  display: block;
  transition: transform 0.38s var(--ease-out-expo);
}
.site-nav__link .swap > span:last-child {
  position: absolute;
  inset: 0;
  transform: translateY(110%);
}
.site-nav__link:hover .swap > span:first-child,
.site-nav__link:focus-visible .swap > span:first-child { transform: translateY(-110%); }
.site-nav__link:hover .swap > span:last-child,
.site-nav__link:focus-visible .swap > span:last-child { transform: none; }
.site-nav__link:hover,
.site-nav__link:focus-visible,
.site-nav__link[aria-current="true"] { color: var(--white); }
.site-header.is-scrolled .site-nav__link:hover,
.site-header.is-scrolled .site-nav__link:focus-visible,
.site-header.is-scrolled .site-nav__link[aria-current="true"] {
  background: rgba(255, 255, 255, 0.085);
}
.site-nav__link[aria-current="true"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--white);
}
.site-header.is-scrolled .site-nav__link[aria-current="true"]::after { display: none; }

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--silver);
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 9px 16px;
  white-space: nowrap;
  transition:
    border-color var(--duration-fast) ease,
    color var(--duration-fast) ease,
    opacity 260ms ease,
    transform 420ms var(--ease-out-expo),
    max-width 420ms var(--ease-out-expo),
    padding 420ms var(--ease-out-expo),
    border-width 420ms var(--ease-out-expo);
  max-width: 280px;
  overflow: hidden;
}
.header-status i {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--white);
  animation: statusPulse 2.6s ease-in-out infinite;
}
.header-status:hover { border-color: var(--silver); color: var(--white); }
.header-status { display: none; }
.site-header.is-scrolled .header-status {
  opacity: 0;
  transform: translateX(8px);
  max-width: 0;
  padding-inline: 0;
  border-width: 0;
}
@keyframes statusPulse { 50% { opacity: 0.3; } }

/* ═══════════ Apple-glass capsule nav ═══════════ */
.site-header {
  height: var(--header-h);
  background: transparent;
}
/* default — full-width editorial bar */
.site-header__inner {
  position: relative;
  width: 100%;
  max-width: var(--content-max);
  min-height: 46px;
  padding: 0 var(--page-gutter);
  justify-content: space-between;
  gap: clamp(18px, 3vw, 48px);
  border: 1px solid transparent;
  border-radius: 999px;
  background: rgba(10, 10, 14, 0);
  box-shadow: none;
  backdrop-filter: blur(0);
  overflow: hidden;
  transition:
    max-width 700ms var(--ease-out-expo),
    min-height 600ms var(--ease-out-expo),
    padding 600ms var(--ease-out-expo),
    gap 600ms var(--ease-out-expo),
    background 420ms ease,
    border-color 420ms ease,
    box-shadow 460ms ease,
    backdrop-filter 460ms ease;
}
/* light-sweep element (fires when the capsule closes) */
.site-header__inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: -160%;
  width: 90%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.02), rgba(255,255,255,0.14), rgba(255,255,255,0.02), transparent);
  transform: skewX(-18deg);
  pointer-events: none;
  z-index: 2;
}
/* status becomes the right-hand element (desktop) */
.header-status { display: inline-flex; }

/* scrolled → floating glass capsule */
.site-header.is-scrolled { height: var(--header-h); }
.site-header.is-scrolled .site-header__inner {
  width: max-content;
  max-width: min(720px, calc(100vw - 28px));
  min-height: 44px;
  padding: 6px 12px 6px 20px;
  justify-content: center;
  gap: clamp(14px, 2vw, 30px);
  border-color: rgba(255, 255, 255, 0.10);
  background: rgba(10, 10, 14, 0.55);
  backdrop-filter: blur(26px) saturate(150%);
  box-shadow:
    0 20px 44px -12px rgba(0, 0, 0, 0.72),
    0 0 22px 0 rgba(255, 255, 255, 0.03),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.10);
  animation: capsulePulse 0.6s var(--ease-out-expo);
}
.site-header.is-scrolled .site-header__inner::before {
  animation: glassShineSweep 0.85s var(--ease-out-expo) 0.08s;
}
/* brand text fades out, monogram stays */
.site-header.is-scrolled .brand-mark { gap: 0; }
.site-header.is-scrolled .brand-mark span {
  opacity: 0;
  transform: translateX(-8px);
  max-width: 0;
  margin-left: -2px;
}
/* nav tightens */
.site-header.is-scrolled .site-nav { gap: clamp(14px, 2vw, 28px); }
.site-header.is-scrolled .site-nav__link { padding: 6px 0; background: transparent; }
.site-header.is-scrolled .site-nav__link[aria-current="true"]::after { display: block; }
/* status collapses away */
.site-header.is-scrolled .header-status {
  opacity: 0;
  transform: translateX(10px);
  max-width: 0;
  padding-inline: 0;
  border-width: 0;
  margin-left: -12px;
}

@keyframes capsulePulse {
  0%   { transform: scale(0.985); }
  55%  { transform: scale(1.004); }
  100% { transform: scale(1); }
}
@keyframes glassShineSweep {
  0%   { left: -160%; }
  100% { left: 160%; }
}

/* monogram sizing — 46:35 ratio, never squished */
.brand-mark svg { width: 30px; height: auto; }
.site-header.is-scrolled .brand-mark svg { width: 28px; height: auto; }

/* menu button (mobile) */
.menu-button {
  display: none;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--white);
  min-height: 44px;
  padding-inline: 8px;
}
.menu-button .bars {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  width: 22px;
}
.menu-button .bars i {
  height: 1.5px;
  background: currentColor;
  transition: transform var(--duration-fast) var(--ease-out-quart), opacity var(--duration-fast) ease;
}
.menu-button[aria-expanded="true"] .bars i:first-child { transform: translateY(3.25px) rotate(45deg); }
.menu-button[aria-expanded="true"] .bars i:last-child { transform: translateY(-3.25px) rotate(-45deg); }

/* full-screen mobile menu */
.site-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  background: var(--black);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--page-gutter);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-medium) ease, visibility var(--duration-medium);
}
.site-menu.is-open { opacity: 1; visibility: visible; }
.site-menu__link {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(34px, 9vw, 56px);
  letter-spacing: -0.03em;
  line-height: 1.25;
  color: var(--silver);
  display: block;
  overflow: hidden;
}
.site-menu__link span {
  display: block;
  transform: translateY(110%);
  transition: transform 0.7s var(--ease-out-expo);
}
.site-menu.is-open .site-menu__link span { transform: none; }
.site-menu__link:hover, .site-menu__link:focus-visible { color: var(--white); }
.site-menu__meta {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}