/* =========================
   HEADER
========================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
  background: transparent;
  /* Animating backdrop-filter on scroll causes heavy GPU repaints — only fade colour/shadow */
  transition:
    background-color 0.3s ease,
    box-shadow 0.3s ease;
}

.site-header.is-scrolled {
  background: rgba(4, 19, 41, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--color-border);
}

.container {
  width: min(100% - 32px, 1240px);
  margin: 0 auto;
}

.header-inner {
  min-height: 85px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* =========================
   LOGO
========================= */
.site-logo {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.site-logo__text {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--color-white);
  line-height: 1;
  white-space: nowrap;
}

/* =========================
   DESKTOP NAV
========================= */
.main-nav {
  margin-left: auto;
  margin-right: auto;
}

.main-nav__list {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav__list a {
  position: relative;
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color 0.25s ease;
}

.main-nav__list a:hover,
.main-nav__list a.active {
  color: var(--color-primary);
}

.main-nav__list a.active::after,
.main-nav__list a:hover::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
}

/* =========================
   ACTIONS
========================= */
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 6px;
  background: var(--color-primary);
  color: var(--color-white);
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: all 0.25s ease;
  box-shadow: 0 10px 24px rgba(var(--color-primary-rgb), 0.22);
}

.header-cta:hover {
  background: var(--color-hover);
  transform: translateY(-1px);
}

/* =========================
   MOBILE TOGGLE
========================= */
.mobile-menu-toggle {
  width: 44px;
  height: 44px;
  display: none;
  border: 1px solid var(--color-border);
  background: transparent;
  border-radius: 8px;
  padding: 0;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.mobile-menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-white);
  transition: all 0.3s ease;
}

.mobile-menu-toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* =========================
   MOBILE MENU
========================= */
.mobile-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background: rgba(4, 19, 41, 0.98);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  pointer-events: none;
  transition: all 0.3s ease;
}

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

.mobile-menu__inner {
  width: min(100% - 32px, 1240px);
  margin: 0 auto;
  padding: 18px 0 24px;
}

.mobile-menu__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-menu__list li + li {
  margin-top: 10px;
}

.mobile-menu__list a {
  display: block;
  text-decoration: none;
  color: var(--color-text-main);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
  transition: all 0.25s ease;
}

.mobile-menu__list a:hover,
.mobile-menu__list a.active {
  color: var(--color-primary);
  border-color: rgba(var(--color-primary-rgb), 0.35);
  background: rgba(var(--color-primary-rgb), 0.07);
}

.mobile-menu__cta {
  background: var(--color-primary) !important;
  color: var(--color-white) !important;
  border-color: transparent !important;
  text-align: center;
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 991px) {
  .main-nav {
    display: none;
  }

  .mobile-menu-toggle {
    display: inline-flex;
  }

  .header-icon-btn {
    display: none;
  }

  .header-inner {
    min-height: 78px;
  }
}

@media (max-width: 767px) {
  .container {
    width: min(100% - 24px, 1240px);
  }

  .header-inner {
    gap: 12px;
    min-height: 72px;
  }

  .site-logo__text {
    font-size: 15px;
  }

  .header-cta {
    min-height: 38px;
    padding: 0 14px;
    font-size: 11px;
  }
}

@media (max-width: 575px) {
  .header-cta {
    display: none;
  }

  .site-logo__text {
    font-size: 14px;
    letter-spacing: 0.06em;
  }

  .mobile-menu__inner {
    width: min(100% - 24px, 1240px);
  }
}