/* ============================================
   Header - Refined
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(10, 22, 40, 0.5);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(6, 164, 231, 0.06);
  transition: all var(--transition);
}

.header.is-scrolled {
  background: rgba(10, 22, 40, 0.92);
  border-bottom-color: rgba(6, 164, 231, 0.12);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Logo - uses the main logo image, not text */
.header__logo {
  display: flex;
  align-items: center;
  gap: 0;
  text-decoration: none;
  flex-shrink: 0;
  transition: opacity var(--transition);
}

.header__logo:hover { opacity: 0.8; }

.header__logo-img {
  height: 28px;
  width: auto;
  object-fit: contain;
}

/* Nav */
.header__nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: 28px;
}

.header__nav-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  transition: all var(--transition);
  position: relative;
  white-space: nowrap;
  padding: 4px 0;
  letter-spacing: 0.02em;
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 1.5px;
  background: var(--color-primary-light);
  transition: all var(--transition);
  transform: translateX(-50%);
}

.header__nav-link:hover {
  color: rgba(255, 255, 255, 0.95);
}

.header__nav-link:hover::after {
  width: 100%;
}

.header__nav-link.is-active {
  color: var(--color-white);
}

.header__cta {
  font-size: 0.8125rem;
  padding: 9px 22px;
  border-radius: 6px;
  letter-spacing: 0.02em;
}

/* --- Mobile Menu --- */
.header__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  position: relative;
  z-index: 1001;
}

.header__burger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 2px;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  transform-origin: center;
}

.header__burger.is-open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.header__burger.is-open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.header__burger.is-open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 22, 40, 0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  padding: calc(var(--header-height) + 48px) 32px 32px;
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mobile-menu__link {
  display: block;
  padding: 20px 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: all var(--transition);
  transform: translateX(-20px);
  opacity: 0;
}

.mobile-menu.is-open .mobile-menu__link {
  transform: translateX(0);
  opacity: 1;
}

.mobile-menu.is-open .mobile-menu__link:nth-child(1) { transition-delay: 0.1s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(2) { transition-delay: 0.15s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(3) { transition-delay: 0.2s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(4) { transition-delay: 0.25s; }
.mobile-menu.is-open .mobile-menu__link:nth-child(5) { transition-delay: 0.3s; }

.mobile-menu__link:hover { color: var(--color-primary-light); padding-left: 12px; }

.mobile-menu__cta {
  margin-top: 40px;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.4s ease 0.35s;
}

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

.mobile-menu__cta .btn { width: 100%; }

@media (max-width: 900px) {
  .header__nav { display: none; }
  .header__burger { display: flex; }
}