/* ==========================================================================
   FEEDER - HEADER / NAV
   ========================================================================== */

.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background var(--dur-fast) ease, border-color var(--dur-fast) ease, height var(--dur-fast) ease;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(3, 5, 10, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom-color: var(--border-subtle);
  height: 72px;
}

.site-header .container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 100%;
}

.brand {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--sp-2);
  line-height: 1;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-lg);
  color: var(--text-primary);
  flex-shrink: 0;
}

.brand-tag {
  display: block;
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-primary);
  white-space: nowrap;
  margin-top: 2px;
  line-height: 1;
}

.brand-logo {
  display: block;
  height: 70px;
  width: auto;
  max-height: 120px;
}

@media (max-width: 960px) {
  .brand-tag {
  display: block;
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-primary);
  white-space: nowrap;
  margin-top: 2px;
  line-height: 1;
}

.brand-logo {
    height: clamp(38px, 3.6vw, 52px);
    max-height: 52px;
  }
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-7);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}

.nav-links a {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding-block: var(--sp-2);
  transition: color var(--dur-fast) ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--accent-cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) ease;
}

/* Header becomes opaque when mobile menu is open */
body.nav-is-open .site-header {
  background: var(--bg-950);
  border-bottom-color: var(--border-subtle);
}

html[dir="rtl"] .nav-links a::after {
  transform-origin: right;
}

html[dir="rtl"] .site-header,
html[dir="rtl"] .site-header .container {
  direction: ltr;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a:hover::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  flex-shrink: 0;
  margin-left: auto;
}

.header-actions--mobile-only-lang,
.header-actions--mobile-only-cta {
  display: none;
}

/* ---------- Desktop: centered compact nav group ---------- */
@media (min-width: 961px) {
  .site-header .container {
    justify-content: center;
    gap: 5%;
  }

  .main-nav {
    position: relative;
    left: auto;
    top: auto;
    transform: none;
    margin-left: 0;
    gap: 0;
  }
  .main-nav,
  .nav-links {
    direction: ltr;
  }

  .nav-links {
    gap: var(--sp-1);
    padding: var(--sp-1) var(--sp-2);
    border-radius: var(--radius-pill);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)), var(--surface-glass);
    border: 1px solid var(--border-subtle);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(16px) saturate(160%);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
  }
  .nav-links a {
    padding: var(--sp-1) var(--sp-2);
    border-radius: var(--radius-sm);
  }
  .nav-links a:hover {
    background: rgba(255, 255, 255, 0.04);
  }

  .header-actions {
    margin-left: 0;
    gap: var(--sp-2);
  }
}

/* ---------- Language switcher ---------- */
.lang-switch {
  position: relative;
}

.lang-switch-btn {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--text-secondary);
}

.lang-switch-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.lang-switch-btn svg {
  width: 14px;
  height: 14px;
  transition: transform var(--dur-fast) ease;
}

.lang-switch.is-open .lang-switch-btn svg {
  transform: rotate(180deg);
}

.lang-menu {
  position: absolute;
  top: calc(100% + var(--sp-3));
  inset-inline-end: 0;
  min-width: 168px;
  padding: var(--sp-2);
  border-radius: var(--radius-md);
  background: var(--surface-glass-strong);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity var(--dur-fast) ease, transform var(--dur-fast) ease;
}

.lang-switch.is-open .lang-menu {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.lang-menu button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-3) var(--sp-3);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  text-align: start;
}

.lang-menu button:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

.lang-menu button[aria-current="true"] {
  color: var(--accent-cyan-strong);
}

/* ---------- Mobile toggle ---------- */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background: var(--surface-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0;
  position: relative;
  transition: border-color var(--dur-fast) ease, background var(--dur-fast) ease;
}

.nav-toggle:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
}

.nav-toggle span {
  position: absolute;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--text-primary);
  transition: transform 0.45s cubic-bezier(0.65, 0, 0.35, 1), opacity 0.3s ease, top 0.45s cubic-bezier(0.65, 0, 0.35, 1);
}

.nav-toggle span:nth-child(1) { top: calc(50% - 5px); }
.nav-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav-toggle span:nth-child(3) { top: calc(50% + 5px); }

.nav-toggle.is-open span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
  transform: translateY(-50%) scaleX(0);
}

.nav-toggle.is-open span:nth-child(3) {
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
}

.nav-close {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background: var(--surface-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  position: absolute;
  top: var(--sp-4);
  right: var(--sp-4);
  z-index: 120;
  transition: border-color var(--dur-fast) ease, background var(--dur-fast) ease;
}

.nav-close span {
  position: absolute;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--text-primary);
  transition: transform var(--dur-fast) ease;
}

.nav-close span:nth-child(1) { transform: rotate(45deg); }
.nav-close span:nth-child(2) { transform: rotate(-45deg); }

/* ---------- Mobile drawer ---------- */
@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02)), var(--surface-glass);
    border: 1px solid var(--border-subtle);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(12px) saturate(160%);
    -webkit-backdrop-filter: blur(12px) saturate(160%);
  }

  .nav-toggle:hover {
    border-color: var(--border-strong);
    background: var(--surface-2);
  }

  body.nav-is-open .site-header .container > .header-actions {
    opacity: 0;
    pointer-events: none;
  }

  .nav-close {
    display: inline-flex;
    position: absolute;
    top: calc((var(--header-h) - 44px) / 2);
    right: var(--container-pad);
    z-index: 120;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
  }

  .nav-close:hover {
    background: var(--surface-2);
    border-color: var(--border-strong);
  }

  .header-cta--desktop,
  .lang-switch--desktop {
    display: none;
  }

  .main-nav {
    position: fixed;
    inset: 0;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: stretch;
    padding: calc(var(--header-h) + var(--sp-6)) var(--container-pad) var(--sp-6);
    background: var(--bg-950);
    gap: var(--sp-6);
    transform: translateX(100%);
    transition: transform 0.55s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.55s;
    z-index: 110;
    visibility: hidden;
    box-shadow: inset 0 1px 0 var(--border-subtle);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .main-nav::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
      radial-gradient(ellipse 160% 50% at 50% -10%, rgba(59, 130, 246, 0.18), transparent 55%),
      radial-gradient(ellipse 100% 40% at 90% 100%, rgba(37, 99, 235, 0.08), transparent 50%),
      var(--bg-950);
    pointer-events: none;
  }

  .main-nav.is-open {
    transform: translateX(0);
    visibility: visible;
  }

  .nav-links {
    flex: 1;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: clamp(var(--sp-3), 2.5vh, var(--sp-5));
    width: 100%;
    max-width: 520px;
  }

  .nav-links li {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .main-nav.is-open .nav-links li {
    opacity: 1;
    transform: translateX(0);
  }

  .main-nav.is-open .nav-links li:nth-child(1) { transition-delay: 0.06s; }
  .main-nav.is-open .nav-links li:nth-child(2) { transition-delay: 0.12s; }
  .main-nav.is-open .nav-links li:nth-child(3) { transition-delay: 0.18s; }
  .main-nav.is-open .nav-links li:nth-child(4) { transition-delay: 0.24s; }
  .main-nav.is-open .nav-links li:nth-child(5) { transition-delay: 0.30s; }
  .main-nav.is-open .nav-links li:nth-child(6) { transition-delay: 0.36s; }

  .nav-links a {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--sp-3);
    font-size: clamp(1.65rem, 5.4vw, 2.6rem);
    font-family: var(--font-display);
    font-weight: 500;
    padding-block: 0;
    color: var(--text-primary);
    transition: color var(--dur-fast) ease, transform var(--dur-fast) ease;
  }

  .nav-links a::after {
    display: none;
  }

  .nav-links a::before {
    content: "";
    width: 0;
    height: 2px;
    border-radius: 2px;
    background: var(--accent-gradient);
    transition: width var(--dur-fast) ease;
  }

  .nav-links a:hover,
  .nav-links a:focus-visible {
    color: var(--accent-cyan-strong);
    transform: translateX(8px);
  }

  .nav-links a:hover::before,
  .nav-links a:focus-visible::before {
    width: 28px;
  }

  .header-actions {
    transition: opacity var(--dur-fast) ease;
  }

  .header-actions--mobile-only-lang,
  .header-actions--mobile-only-cta {
    display: flex;
    width: 100%;
    max-width: 520px;
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }

  .main-nav.is-open .header-actions--mobile-only-cta { transition-delay: 0.44s; }
  .main-nav.is-open .header-actions--mobile-only-lang { transition-delay: 0.52s; }

  .main-nav.is-open .header-actions--mobile-only-lang,
  .main-nav.is-open .header-actions--mobile-only-cta {
    opacity: 1;
    transform: translateY(0);
  }

  .header-actions--mobile-only-cta .btn-pill {
    width: 100%;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    font-size: var(--fs-md);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.92);
  }

  .header-actions--mobile-only-cta .btn-pill:hover {
    background: #fff;
    color: var(--text-inverse);
  }

  .header-actions--mobile-only-lang .lang-switch {
    width: 100%;
  }

  .header-actions--mobile-only-lang .lang-switch-btn {
    width: 100%;
    justify-content: space-between;
    padding: var(--sp-3) var(--sp-4);
    border-radius: var(--radius-md);
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    font-size: var(--fs-md);
    color: var(--text-primary);
  }

  .header-actions--mobile-only-lang .lang-switch-btn:hover,
  .header-actions--mobile-only-lang .lang-switch.is-open .lang-switch-btn {
    background: var(--surface-2);
    border-color: var(--border-strong);
    color: var(--text-primary);
  }

  .header-actions--mobile-only-lang .lang-menu {
    position: relative;
    top: auto;
    inset-inline-end: auto;
    margin-top: var(--sp-2);
    width: 100%;
    min-width: 0;
    background: var(--bg-800);
    border-color: var(--border-subtle);
    box-shadow: var(--shadow-md);
  }
}

/* Small mobile / short landscape */
@media (max-width: 380px), (max-height: 520px) and (orientation: portrait) {
  .main-nav {
    padding: calc(var(--header-h) + var(--sp-4)) var(--sp-4) var(--sp-5);
    gap: var(--sp-4);
  }

  .nav-links a {
    font-size: 1.45rem;
  }
}