/* ==========================================================================
   Header — Navigation + Sticky + Mobile Menu
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: transparent;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-header.is-scrolled,
.site-header--solid {
  background: rgba(17, 21, 24, 0.97);
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(8px);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

/* ── Logo ── */
.header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header__logo img {
  height: 36px;
  width: auto;
}

.header__logo-text {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: var(--fw-bold);
  color: var(--color-white);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.header__logo-text .logo-dot {
  color: var(--color-primary);
}

/* ── Main Nav ── */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.main-nav__link {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.875rem;
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.main-nav__link:hover,
.main-nav__link.is-active {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.06);
}

.main-nav__link.is-active {
  color: var(--color-primary);
}

/* ── Dropdown ── */
.nav-dropdown {
  position: relative;
}

.nav-dropdown__toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.875rem;
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  cursor: pointer;
}

.nav-dropdown__toggle:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.06);
}

.nav-dropdown__toggle svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown__toggle svg {
  transform: rotate(180deg);
}

.nav-dropdown__menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xs);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-fast);
  z-index: 100;
}

.nav-dropdown:hover .nav-dropdown__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(4px);
}

.nav-dropdown__item {
  display: block;
  padding: 0.625rem 0.875rem;
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: var(--color-body);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-dropdown__item:hover {
  background: var(--color-bg-light);
  color: var(--color-primary);
}

/* ── CTA ── */
.header__cta {
  margin-left: var(--space-md);
}

/* ── Mobile Toggle ── */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
  cursor: pointer;
  z-index: 1001;
}

.mobile-toggle span {
  display: block;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.mobile-toggle.is-open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-toggle.is-open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 300px;
    height: 100vh;
    flex-direction: column;
    align-items: flex-start;
    background: var(--color-dark);
    padding: calc(var(--header-height) + var(--space-lg)) var(--space-xl) var(--space-xl);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.2);
    overflow-y: auto;
  }

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

  .main-nav__link {
    width: 100%;
    padding: 0.75rem 0;
    font-size: var(--fs-body);
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .nav-dropdown {
    width: 100%;
  }

  .nav-dropdown__toggle {
    width: 100%;
    padding: 0.75rem 0;
    font-size: var(--fs-body);
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .nav-dropdown__menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: transparent;
    padding: 0 0 0 var(--space-md);
    display: none;
  }

  .nav-dropdown.is-open .nav-dropdown__menu {
    display: block;
  }

  .nav-dropdown__item {
    color: rgba(255, 255, 255, 0.6);
    padding: 0.5rem 0;
  }

  .nav-dropdown__item:hover {
    background: transparent;
    color: var(--color-primary);
  }

  .header__cta {
    margin-left: auto;
    margin-right: var(--space-md);
  }

  .header__cta .btn {
    font-size: var(--fs-small);
    padding: 0.4rem 1rem;
  }

  .mobile-toggle {
    display: flex;
  }
}