/* ============================================================
   Navigation — dark
   Sticky top bar with backdrop blur, brand mark, links,
   CTA, language switcher, mobile hamburger, scroll progress.
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(2, 12, 30, 0.72);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: #fff;
  transition:
    background 300ms ease,
    border-color 300ms ease,
    box-shadow 300ms ease;
}
.nav.scrolled {
  background: rgba(2, 12, 30, 0.92);
  border-bottom-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}

/* Scroll progress bar */
.nav-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: var(--progress, 0%);
  background: linear-gradient(90deg, var(--color-accent) 0%, #ff8b4a 100%);
  box-shadow: 0 0 12px rgba(255, 77, 6, 0.6);
  transition: width 100ms linear;
  pointer-events: none;
  z-index: 1;
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 18px;
  padding-left: 12px;
  padding-right: 12px;
}
@media (min-width: 768px) {
  .nav .container {
    padding-left: 24px;
    padding-right: 24px;
  }
}
@media (min-width: 1024px) {
  .nav .container {
    padding-left: 36px;
    padding-right: 36px;
  }
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  color: inherit;
}
.nav-logo-image {
  width: 44px;
  height: 44px;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: 6px;
}
.nav-logo-copy {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}
.nav-logo-title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: #fff;
}
.nav-logo-subtitle {
  font: 500 10px/1 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  position: relative;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.72);
  transition: color 180ms ease;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}
.nav-links a:hover {
  color: #fff;
}
.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
}
.nav-links a.active {
  color: #fff;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-cta .btn-outline {
  font-size: 14px;
  padding: 9px 16px;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.04);
}
.nav-cta .btn-outline:hover {
  background: #fff;
  color: var(--color-text);
  border-color: #fff;
}
.nav-cta .btn-primary {
  font-size: 14px;
  padding: 9px 18px;
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  cursor: pointer;
  padding: 10px;
  z-index: 1001;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  transition: all 300ms ease;
  border-radius: 2px;
}
.nav-hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 1024px) {
  .nav-links,
  .nav-cta .btn-outline {
    display: none;
  }
  .nav-hamburger {
    display: flex;
  }
}
@media (max-width: 640px) {
  .nav-cta .btn-primary,
  .nav-logo-subtitle {
    display: none;
  }
  .lang-switcher {
    margin: 0;
  }
  .lang-btn {
    padding: 7px 10px;
    font-size: 12px;
  }
}

/* Language switcher */
.lang-switcher {
  position: relative;
}
.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-pill);
  padding: 8px 14px;
  font: 500 13px/1 var(--font-body);
  color: #fff;
  cursor: pointer;
  transition:
    border-color 200ms ease,
    background 200ms ease;
  min-height: 38px;
}
.lang-btn:hover {
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.08);
}
.lang-btn .arrow {
  font-size: 10px;
  transition: transform 200ms ease;
}
.lang-btn.open .arrow {
  transform: rotate(180deg);
}
.lang-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  display: grid;
  gap: 2px;
  width: 200px;
  padding: 8px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(8, 18, 38, 0.96);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(14px);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: all 200ms ease;
  z-index: 100;
}
.lang-dropdown.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.lang-dropdown button {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 12px;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.78);
  cursor: pointer;
  text-align: left;
  transition: background 150ms ease;
}
.lang-dropdown button:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
.lang-dropdown button.active {
  color: var(--color-accent);
  font-weight: 600;
}
.lang-dropdown button .check {
  margin-left: auto;
  font-size: 11px;
  color: var(--color-accent);
  opacity: 0;
}
.lang-dropdown button.active .check {
  opacity: 1;
}
@media (max-width: 1024px) {
  .lang-switcher {
    margin-right: auto;
    margin-left: 12px;
  }
}

/* Mobile menu drawer */
.mobile-menu {
  position: fixed;
  inset: var(--nav-h) 0 0 0;
  background: rgba(2, 12, 30, 0.98);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 8px;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms ease;
  overflow-y: auto;
}
.mobile-menu.active {
  opacity: 1;
  pointer-events: auto;
}
.mobile-menu a {
  display: block;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  padding: 14px 16px;
  border-radius: var(--radius-md);
  transition: background 200ms ease, color 200ms ease;
  position: relative;
}
.mobile-menu a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
}
.mobile-menu a.active {
  color: var(--color-accent);
  background: rgba(255, 77, 6, 0.08);
}