/* Global Header Parity v4 — frozen canonical legacy bridge
   Existing legacy pages keep their copied markup, but all visual geometry,
   typography, cube motion and mobile behavior are owned here. */

.global-header {
  --legacy-header-height: 85px;
  --legacy-header-shell: 1600px;
  --legacy-header-pad-x: 40px;
  --legacy-header-cyan: #5de2ff;
  --legacy-header-bg: rgba(5, 5, 6, .82);
  --legacy-header-border: rgba(255, 255, 255, .09);
  --legacy-header-text: rgba(255, 255, 255, .82);
  --legacy-header-muted: rgba(255, 255, 255, .64);
  --legacy-header-cta-width: 184px;
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  display: flex;
  width: 100%;
  height: var(--legacy-header-height);
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--legacy-header-border);
  background: var(--legacy-header-bg);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  font-kerning: normal;
  text-rendering: geometricPrecision;
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s ease, box-shadow .25s ease, transform .25s ease;
}

.global-header,
.global-header *,
.global-header *::before,
.global-header *::after {
  box-sizing: border-box;
}

.global-header.is-scrolled {
  background: rgba(5, 5, 6, .94);
  box-shadow: 0 10px 35px rgba(0, 0, 0, .24);
}

.global-header .header-container {
  display: grid;
  grid-template-columns: minmax(230px, 1fr) auto minmax(286px, 1fr);
  align-items: center;
  width: 100%;
  max-width: var(--legacy-header-shell);
  height: 100%;
  padding: 0 var(--legacy-header-pad-x);
}

.global-header .logo-block {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: 12px;
  min-width: 230px;
  min-height: 44px;
  color: #fff;
  text-decoration: none;
}

.global-header .logo-cube-container {
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  perspective: 420px;
}

.global-header .logo-cube {
  display: block;
  position: relative;
  width: 20px;
  height: 20px;
  margin: 6px auto;
  transform-style: preserve-3d;
  animation: proaiLegacyHeaderCubeSpin 10s linear infinite;
  animation-play-state: running;
}

@keyframes proaiLegacyHeaderCubeSpin {
  from { transform: rotateX(0) rotateY(0); }
  to { transform: rotateX(360deg) rotateY(360deg); }
}

.global-header .l-face {
  position: absolute;
  width: 20px;
  height: 20px;
  border: 1.5px solid var(--legacy-header-cyan);
  background: rgba(93, 226, 255, .10);
  box-shadow: inset 0 0 8px rgba(93, 226, 255, .08);
}

.global-header .lf-front { transform: translateZ(10px); }
.global-header .lf-back { transform: rotateY(180deg) translateZ(10px); }
.global-header .lf-right { transform: rotateY(90deg) translateZ(10px); }
.global-header .lf-left { transform: rotateY(-90deg) translateZ(10px); }
.global-header .lf-top { transform: rotateX(90deg) translateZ(10px); }
.global-header .lf-bottom { transform: rotateX(-90deg) translateZ(10px); }

.global-header .logo-text {
  display: inline-block;
  white-space: nowrap;
  font-size: 20px;
  line-height: 1;
  font-weight: 900;
  letter-spacing: -1px;
  text-transform: uppercase;
}

.global-header .logo-text span {
  color: var(--legacy-header-cyan);
  text-shadow: 0 0 15px rgba(93, 226, 255, .55);
}

.global-header .site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
}

.global-header .site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--legacy-header-muted);
  text-decoration: none;
  white-space: nowrap;
  font-size: 10px;
  line-height: 1;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: .9px;
  transition: color .22s ease, text-shadow .22s ease;
}

.global-header .site-nav a:hover,
.global-header .site-nav a.is-active,
.global-header .site-nav a[aria-current="page"] {
  color: var(--legacy-header-cyan);
  text-shadow: 0 0 10px rgba(93, 226, 255, .82);
}

.global-header .header-actions {
  display: grid;
  grid-template-columns: 52px var(--legacy-header-cta-width);
  align-items: center;
  justify-content: end;
  justify-self: end;
  gap: 16px;
  min-width: 286px;
}

.global-header .lang-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  min-width: 52px;
  max-width: 52px;
  height: 44px;
  min-height: 44px;
  max-height: 44px;
  padding: 0;
  color: var(--legacy-header-cyan);
  text-decoration: none;
  text-align: center;
  font-size: 13px;
  line-height: 1;
  font-weight: 900;
  letter-spacing: .5px;
}

.global-header .start-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--legacy-header-cta-width);
  min-width: var(--legacy-header-cta-width);
  max-width: var(--legacy-header-cta-width);
  height: 44px;
  min-height: 44px;
  max-height: 44px;
  padding: 0 20px;
  border: 1.5px solid var(--legacy-header-cyan);
  border-radius: 4px;
  color: #fff;
  background: rgba(93, 226, 255, .05);
  text-decoration: none;
  white-space: nowrap;
  font-size: 11px;
  line-height: 1;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: background-color .22s ease, color .22s ease, box-shadow .22s ease;
}

.global-header .start-btn:hover {
  color: #000;
  background: var(--legacy-header-cyan);
  box-shadow: 0 0 34px rgba(93, 226, 255, .65);
}

.global-header .mobile-menu-toggle {
  display: none;
  position: relative;
  z-index: 1002;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  cursor: pointer;
}

.global-header .mobile-menu-toggle span {
  position: absolute;
  display: block;
  width: 24px;
  height: 2px;
  border-radius: 0;
  background: #fff;
  transition: transform .25s ease, opacity .25s ease;
}

.global-header .mobile-menu-toggle span:nth-child(1) { transform: translateY(-8px); }
.global-header .mobile-menu-toggle span:nth-child(3) { transform: translateY(8px); }
.global-header .mobile-menu-toggle.is-open span:nth-child(1),
body.menu-open .global-header .mobile-menu-toggle span:nth-child(1) { transform: rotate(45deg); }
.global-header .mobile-menu-toggle.is-open span:nth-child(2),
body.menu-open .global-header .mobile-menu-toggle span:nth-child(2) { opacity: 0; }
.global-header .mobile-menu-toggle.is-open span:nth-child(3),
body.menu-open .global-header .mobile-menu-toggle span:nth-child(3) { transform: rotate(-45deg); }

.global-header a:focus-visible,
.global-header button:focus-visible {
  outline: 2px solid var(--legacy-header-cyan);
  outline-offset: 4px;
}

body.menu-open,
body.mobile-nav-open { overflow: hidden; }

@media (max-width: 1200px) {
  .global-header { --legacy-header-pad-x: 36px; }
  .global-header .header-container {
    display: flex;
    justify-content: space-between;
  }
  .global-header .logo-block { min-width: 0; }
  .global-header .header-actions {
    display: grid;
    grid-template-columns: 52px 44px;
    gap: 12px;
    min-width: 108px;
  }
  .global-header .start-btn { display: none !important; }
  .global-header .mobile-menu-toggle { display: flex !important; }
  .global-header .site-nav {
    position: fixed !important;
    inset: var(--legacy-header-height) 0 0 !important;
    z-index: 999 !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: stretch !important;
    justify-content: flex-start !important;
    gap: 0 !important;
    width: 100% !important;
    height: calc(100svh - var(--legacy-header-height)) !important;
    padding: clamp(40px, 8vh, 84px) max(44px, env(safe-area-inset-left)) max(38px, env(safe-area-inset-bottom)) !important;
    overflow-y: auto !important;
    overscroll-behavior: contain;
    border: 0 !important;
    background: #050506 !important;
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
    transform: translateY(-8px);
    transition: opacity .2s ease, visibility .2s ease, transform .2s ease;
  }
  .global-header .site-nav.is-open {
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
    transform: translateY(0);
  }
  .global-header .site-nav a {
    width: 100% !important;
    min-height: 64px !important;
    padding: 16px 0 !important;
    border-bottom: 1px solid rgba(255, 255, 255, .08) !important;
    color: var(--legacy-header-text) !important;
    font-size: clamp(17px, 4.2vw, 23px) !important;
    line-height: 1.15 !important;
    font-weight: 760 !important;
    letter-spacing: .02em !important;
    text-transform: none !important;
  }
  .global-header .site-nav a:hover,
  .global-header .site-nav a.is-active,
  .global-header .site-nav a[aria-current="page"] {
    color: var(--legacy-header-cyan) !important;
    text-shadow: 0 0 9px rgba(93, 226, 255, .78), 0 0 22px rgba(93, 226, 255, .28) !important;
  }
}

@media (max-width: 620px) {
  .global-header {
    --legacy-header-height: 84px;
    --legacy-header-pad-x: 28px;
  }
  .global-header .logo-cube-container {
    flex-basis: 30px;
    width: 30px;
    height: 30px;
  }
  .global-header .logo-text { font-size: clamp(18px, 5vw, 20px); }
  .global-header .header-actions {
    grid-template-columns: 46px 44px;
    gap: 8px;
    min-width: 98px;
  }
  .global-header .lang-link {
    width: 46px;
    min-width: 46px;
    max-width: 46px;
  }
  .global-header .site-nav {
    padding-inline: max(28px, env(safe-area-inset-left)) !important;
  }
  .global-header .site-nav a {
    min-height: 62px !important;
    font-size: clamp(17px, 5.5vw, 21px) !important;
  }
}

@media (max-height: 540px) and (orientation: landscape) {
  .global-header {
    --legacy-header-height: 68px;
    --legacy-header-pad-x: 24px;
  }
  .global-header .logo-text { font-size: 18px; }
  .global-header .site-nav {
    display: grid !important;
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    align-content: start !important;
    column-gap: 34px !important;
    padding: 16px max(28px, env(safe-area-inset-left)) max(16px, env(safe-area-inset-bottom)) !important;
  }
  .global-header .site-nav a {
    min-height: 47px !important;
    padding: 10px 0 !important;
    font-size: clamp(14px, 2.4vw, 17px) !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  .global-header,
  .global-header .site-nav,
  .global-header .site-nav a,
  .global-header .start-btn,
  .global-header .mobile-menu-toggle span { transition: none; }
  .global-header .logo-cube {
    animation: none;
    transform: rotateX(-18deg) rotateY(28deg);
  }
}