/* ==========================================================================
   Section: Header / Navigation
   ========================================================================== */

.header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background:
    linear-gradient(180deg, rgba(6, 8, 20, 0.85) 0%, rgba(6, 8, 20, 0.6) 60%, rgba(6, 8, 20, 0.25) 100%),
    rgba(6, 8, 20, 0.3);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(124, 58, 237, 0.12);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  min-height: var(--header-height);
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-shrink: 0;
  transition: opacity var(--transition-base);
}

.header__logo:hover {
  opacity: 0.9;
}

.header__logo-icon {
  display: flex;
  width: 2.75rem;
  height: 2.75rem;
  filter: drop-shadow(0 0 6px rgba(147, 51, 234, 0.6)) drop-shadow(0 0 12px rgba(147, 51, 234, 0.3));
}

.header__logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  mix-blend-mode: screen;
  filter: brightness(1.4) contrast(1.2) saturate(1.3);
}

.header__logo-text {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.header__logo-title {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.header__logo-boost {
  background: linear-gradient(180deg, #ffffff 0%, #e8e8e8 50%, #c0c0c0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 4px rgba(255, 255, 255, 0.5));
}

.header__logo-pay {
  background: linear-gradient(180deg, #d8b4fe 0%, #a855f7 50%, #7c3aed 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 6px rgba(168, 85, 247, 0.7));
  animation: none;
}

.header__logo-subtitle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.header__logo-line {
  width: 1.25rem;
  height: 1px;
  background: rgba(255, 255, 255, 0.25);
}

/* Burger (mobile) */
.header__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: var(--space-sm);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
  transition: border-color var(--transition-base), background var(--transition-base);
}

.header__burger:hover {
  border-color: var(--color-border);
  background: rgba(124, 58, 237, 0.08);
}

.header__burger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.header__burger[aria-expanded="true"] .header__burger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__burger[aria-expanded="true"] .header__burger-line:nth-child(2) {
  opacity: 0;
}

.header__burger[aria-expanded="true"] .header__burger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Navigation */
.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
  flex: 1;
  justify-content: center;
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.header__nav-link {
  position: relative;
  padding-block: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  white-space: nowrap;
  transition: color var(--transition-base);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--color-accent-light);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-base);
}

.header__nav-link:hover,
.header__nav-link:focus-visible {
  color: var(--color-accent-light);
}

.header__nav-link:hover::after,
.header__nav-link:focus-visible::after,
.header__nav-link.is-active::after {
  transform: scaleX(1);
}

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

/* Action buttons */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-shrink: 0;
}

.header__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.625rem 1.125rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
  transition:
    border-color var(--transition-base),
    background var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

.header__btn-icon {
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
}

.header__btn--support {
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-text-primary);
}

.header__btn--support:hover {
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.08);
}

.header__btn--login {
  border: 1px solid var(--color-accent-light);
  background: rgba(124, 58, 237, 0.08);
  color: var(--color-text-primary);
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.15);
}

.header__btn--login:hover {
  border-color: var(--color-accent-light);
  background: rgba(124, 58, 237, 0.18);
  box-shadow: 0 0 28px rgba(124, 58, 237, 0.3);
  transform: translateY(-1px);
}

/* Tablet */
@media (max-width: 1100px) {
  .header__nav-list {
    gap: var(--space-lg);
  }

  .header__nav-link {
    font-size: var(--font-size-xs);
  }

  .header__btn {
    padding: 0.5rem 0.875rem;
    font-size: var(--font-size-xs);
  }
}

/* Mobile */
@media (max-width: 900px) {
  .header__burger {
    display: flex;
  }

  .header__nav {
    position: fixed;
    inset: 4.5rem 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-xl);
    padding: var(--space-xl) var(--container-padding);
    background: rgba(8, 12, 26, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(124, 58, 237, 0.2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-0.5rem);
    transition:
      opacity var(--transition-base),
      visibility var(--transition-base),
      transform var(--transition-base);
  }

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

  .header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .header__nav-link {
    display: block;
    padding: var(--space-md) 0;
    font-size: var(--font-size-base);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .header__actions {
    flex-direction: column;
    width: 100%;
  }

  .header__btn {
    justify-content: center;
    width: 100%;
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-sm);
  }
}