/* ==========================================================================
   Page chrome: transition curtain, header, mobile menu, side progress
   ========================================================================== */

/* ---------- Page transition curtain ---------- */

.curtain {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: none;
  place-items: center;
  background: var(--bg-deep);
  pointer-events: none;
}
.js .curtain {
  display: grid;
  pointer-events: auto;
  /* fail-safe: if the script never runs, don't trap the visitor behind it */
  animation: curtain-failsafe 0.01s linear 4s forwards;
}
.curtain__mark {
  width: 3.2rem; height: 3.2rem;
  color: var(--text);
  opacity: 0;
  animation: mark-in 0.9s var(--ease) 0.15s forwards;
}
@keyframes mark-in { from { opacity: 0; transform: translateY(10px) scale(0.94); } to { opacity: 1; transform: none; } }
@keyframes curtain-failsafe { to { visibility: hidden; pointer-events: none; } }

.curtain.is-done {
  animation: none;
  transform: translateY(-101%);
  transition: transform 1s var(--ease-io);
  pointer-events: none;
}
.curtain.is-done .curtain__mark { opacity: 0; transition: opacity 0.3s; animation: none; }

.curtain.is-leave {
  animation: curtain-in 0.65s var(--ease-io) forwards;
  pointer-events: auto;
}
.curtain.is-leave .curtain__mark { animation: mark-in 0.6s var(--ease) 0.25s forwards; }
@keyframes curtain-in { from { transform: translateY(101%); } to { transform: translateY(0); } }

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  transition: background-color 0.5s, backdrop-filter 0.5s, border-color 0.5s, transform 0.7s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(5, 7, 13, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--line);
}
.site-header.is-hidden { transform: translateY(-100%); }

.site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: var(--header-h);
  padding-inline: var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  justify-self: start;
}
.brand__mark { width: 1.7rem; height: 1.7rem; flex: none; transition: transform 0.7s var(--ease); }
.brand__word { height: 0.95rem; width: auto; aspect-ratio: 175 / 32; }
.brand:hover .brand__mark { transform: translateY(2px) scale(1.06); }

.nav__list { display: flex; gap: clamp(1.4rem, 3.4vw, 4.2rem); }
.nav__link {
  position: relative;
  display: inline-flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.9rem 0.15rem 1.25rem;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(245, 247, 255, 0.78);
  transition: color 0.4s;
}
.nav__n { font-size: 0.55rem; letter-spacing: 0.08em; color: var(--faint); margin-top: 0.05rem; transition: color 0.4s; }
.nav__link::after {
  content: '';
  position: absolute;
  left: 50%; bottom: 0.55rem;
  width: 4px; height: 4px;
  margin-left: -2px;
  border-radius: 50%;
  background: var(--text);
  transform: scale(0);
  transition: transform 0.5s var(--ease);
}
.nav__link:hover,
.nav__link.is-active { color: #fff; }
.nav__link.is-active .nav__n { color: var(--blue-soft); }
.nav__link:hover::after,
.nav__link.is-active::after { transform: scale(1); }

.site-header__cta { justify-self: end; }

/* ---------- Burger ---------- */

.burger {
  display: none;
  position: relative;
  justify-self: end;
  width: 2.9rem; height: 2.9rem;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(10px);
  z-index: 70;
}
.burger__lines { position: absolute; inset: 0; }
.burger__lines i {
  position: absolute;
  left: 50%; top: 50%;
  width: 1.1rem; height: 1.5px;
  margin-left: -0.55rem;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.6s var(--ease);
}
.burger__lines i:first-child { transform: translateY(-3.5px); }
.burger__lines i:last-child { transform: translateY(3.5px); }
.burger[aria-expanded='true'] .burger__lines i:first-child { transform: rotate(45deg); }
.burger[aria-expanded='true'] .burger__lines i:last-child { transform: rotate(-45deg); }

@media (max-width: 1100px) {
  .site-header__inner { grid-template-columns: 1fr auto; }
  .nav, .site-header__cta { display: none; }
  .burger { display: block; }
}

/* ---------- Mobile menu ---------- */

.menu {
  position: fixed;
  inset: 0;
  z-index: 55;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2rem;
  padding: calc(var(--header-h) + 2.5rem) var(--gutter) calc(2rem + env(safe-area-inset-bottom));
  background:
    radial-gradient(60% 50% at 90% 0%, rgba(71, 123, 255, 0.22), transparent 70%),
    radial-gradient(50% 40% at 0% 100%, rgba(124, 92, 255, 0.16), transparent 70%),
    var(--bg-deep);
  clip-path: circle(0% at calc(100% - 2.6rem) 2.2rem);
  transition: clip-path 0.9s var(--ease-io);
  overflow-y: auto;
}
.menu[hidden] { display: none; }
.menu.is-open { clip-path: circle(160% at calc(100% - 2.6rem) 2.2rem); }

.menu__nav li { overflow: hidden; border-bottom: 1px solid var(--line); }
.menu__nav a {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  padding: 0.85rem 0;
  font-family: var(--serif);
  font-size: clamp(2.4rem, 11vw, 4rem);
  font-weight: 320;
  letter-spacing: -0.02em;
  line-height: 1.1;
  opacity: 0;
  transform: translateY(100%);
  transition: opacity 0.6s var(--ease), transform 0.9s var(--ease);
}
.menu__nav a span { font-family: var(--sans); font-size: 0.7rem; letter-spacing: 0.1em; color: var(--blue-soft); }
.menu.is-open .menu__nav a {
  opacity: 1;
  transform: none;
  transition-delay: calc(0.3s + var(--i) * 0.07s);
}
.menu__foot {
  display: grid;
  gap: 1.1rem;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease) 0.7s, transform 0.8s var(--ease) 0.7s;
}
.menu.is-open .menu__foot { opacity: 1; transform: none; }
.menu__mail { font-size: 0.95rem; color: var(--muted); text-align: center; }

body.menu-open { overflow: hidden; }

/* ---------- Side progress ---------- */

.side {
  position: fixed;
  right: clamp(0.9rem, 1.6vw, 1.75rem);
  top: 50%;
  z-index: 40;
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 1.3rem;
  transform: translateY(-50%);
  transition: opacity 0.5s;
}
.side__label {
  writing-mode: vertical-rl;
  font-size: 0.6rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--muted);
}
.side__track {
  position: relative;
  width: 1px; height: 9rem;
  background: var(--line-strong);
}
.side__dot {
  --p: 0;
  position: absolute;
  left: 50%; top: calc(var(--p) * 100%);
  width: 0.7rem; height: 0.7rem;
  margin: -0.35rem 0 0 -0.35rem;
  border: 1px solid var(--text);
  border-radius: 50%;
  background: var(--bg-deep);
  box-shadow: 0 0 14px rgba(71, 123, 255, 0.7);
  transition: top 0.6s var(--ease);
}
.side__count {
  display: grid;
  gap: 0.3rem;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  font-weight: 400;
  color: var(--faint);
  text-align: center;
}
.side__count b { font-weight: 400; }
.side__count b:first-child { color: var(--text); }
.side.is-off { opacity: 0; }
@media (min-width: 1320px) { .side { display: flex; } }

/* ---------- Header: right-hand group + language switch ---------- */

.site-header__right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(0.7rem, 1.4vw, 1.4rem);
  justify-self: end;
}
.site-header__cta { justify-self: auto; }

.lang {
  position: relative;
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  padding: 0.22rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.lang__glider {
  position: absolute;
  top: 0.22rem; bottom: 0.22rem; left: 0.22rem;
  width: calc(50% - 0.22rem);
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(91, 138, 255, 0.95), rgba(71, 123, 255, 0.85));
  box-shadow: 0 4px 18px -4px rgba(71, 123, 255, 0.8);
  transition: transform 0.6s var(--ease);
}
.lang[data-active='en'] .lang__glider { transform: translateX(100%); }
.lang__btn {
  position: relative;
  z-index: 1;
  min-width: 2.4rem;
  padding: 0.42rem 0.5rem;
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--muted);
  transition: color 0.4s;
}
.lang__btn.is-active { color: #fff; }
.lang__btn:hover:not(.is-active) { color: var(--text); }

.menu__nav a b { font-weight: inherit; }