/* ============================================================
   VANGUARD SOLUTIONS — HEADER CSS
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(5, 5, 8, 0.75);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 240, 255, 0.0);
  transition: border-color 0.4s ease, background 0.4s ease, box-shadow 0.4s ease;
}

.site-header.scrolled {
  background: rgba(5, 5, 8, 0.95);
  border-bottom-color: rgba(0, 240, 255, 0.15);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5), 0 1px 0 rgba(0,240,255,0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* ── LOGO ──────────────────────────────────────────────────── */
.header-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.5));
  transition: filter var(--transition-med);
}

.header-logo:hover .logo-icon {
  filter: drop-shadow(0 0 14px rgba(0, 240, 255, 0.8));
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
  white-space: nowrap;
}

.logo-accent {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-left: 0.15em;
}

/* ── DESKTOP NAV ────────────────────────────────────────────── */
.header-nav {
  display: none;
}

@media (min-width: 900px) {
  .header-nav { display: flex; }
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  position: relative;
  padding: 0.5rem 0.9rem;
  font-family: var(--font-tech);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(224, 224, 224, 0.7);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 1px;
  background: var(--grad-main);
  border-radius: 1px;
  transition: transform var(--transition-med);
  box-shadow: var(--glow-cyan);
}

.nav-link:hover,
.nav-link.active {
  color: #fff;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-link.active {
  color: var(--cyan);
  text-shadow: var(--glow-text-cyan);
}

/* CTA button in nav */
.nav-cta {
  background: transparent;
  border: 1px solid rgba(0, 240, 255, 0.3);
  color: var(--cyan) !important;
  margin-left: 0.5rem;
  padding: 0.4rem 1.2rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-med);
}

.nav-cta::after { display: none; }

.nav-cta:hover {
  background: rgba(0, 240, 255, 0.08);
  border-color: var(--cyan);
  box-shadow: var(--glow-cyan);
  color: var(--cyan) !important;
}

.nav-cta.active {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--cyan);
  box-shadow: var(--glow-cyan);
}

/* ── HAMBURGER ──────────────────────────────────────────────── */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 6px;
  background: rgba(0,240,255,0.05);
  border: 1px solid rgba(0,240,255,0.15);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 1001;
}

.hamburger:hover {
  background: rgba(0,240,255,0.1);
  border-color: rgba(0,240,255,0.4);
}

.ham-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--cyan);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s ease;
  box-shadow: 0 0 4px rgba(0,240,255,0.5);
}

.hamburger.open .ham-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.open .ham-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.open .ham-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 900px) {
  .hamburger { display: none; }
}

/* ── MOBILE MENU ────────────────────────────────────────────── */
.mobile-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: rgba(5, 5, 8, 0.97);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 240, 255, 0.15);
  padding: 1.5rem var(--container-pad) 2rem;
  transform: translateY(-10px);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.35s ease, opacity 0.35s ease, visibility 0.35s ease;
  z-index: 999;
}

.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-nav-link {
  display: block;
  padding: 0.85rem 1rem;
  font-family: var(--font-tech);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(224, 224, 224, 0.75);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--cyan);
  background: rgba(0,240,255,0.06);
  border-left-color: var(--cyan);
  padding-left: 1.4rem;
}

.mobile-cta {
  margin-top: 0.5rem;
  text-align: center;
  background: rgba(0,240,255,0.08);
  border: 1px solid rgba(0,240,255,0.3);
  color: var(--cyan) !important;
  border-radius: var(--radius-sm);
  border-left: none !important;
}

.mobile-cta:hover {
  background: rgba(0,240,255,0.15) !important;
  border-color: var(--cyan) !important;
  box-shadow: var(--glow-cyan);
  padding-left: 1rem !important;
}

/* ── HEADER GLOW LINE ───────────────────────────────────────── */
.header-glow-line {
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 1px;
  background: var(--grad-main);
  box-shadow: var(--glow-cyan);
  transition: width 0.6s ease;
}

.site-header.scrolled .header-glow-line {
  width: 40%;
}

/* ── LANGUAGE SWITCH ───────────────────────────────────────── */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: 1rem;
  padding: 0.4rem 0.75rem;
  background: transparent;
  border: 1px solid rgba(0, 240, 255, 0.35);
  border-radius: 999px;
  color: #fff;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
}

.lang-switch:hover,
.lang-switch:focus-visible {
  border-color: #00F0FF;
  color: #00F0FF;
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.35);
  outline: none;
}

@media (max-width: 899px) {
  .lang-switch { margin-left: auto; margin-right: 0.75rem; }
}

@media (max-width: 480px) {
  .lang-switch { padding: 0.35rem 0.6rem; margin-right: 0.5rem; }
  .lang-switch i { display: none; }
}