/* Header-specific styles for Xia */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(5, 7, 19, 0.95), rgba(5, 7, 19, 0.82), rgba(5, 7, 19, 0));
  border-bottom: 1px solid rgba(30, 64, 175, 0.5);
}

.site-header::before {
  content: "";
  position: fixed;
  inset: 0;
  background: linear-gradient(to bottom, rgba(2, 6, 23, 0.82), rgba(2, 6, 23, 0.56));
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
  z-index: -1;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  gap: var(--space-4);
}

.site-header__brand {
  display: flex;
  align-items: center;
}

.site-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.site-header__logo-mark {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  background:
    conic-gradient(from 180deg, var(--color-primary), var(--color-accent-blue), var(--color-accent-green), var(--color-primary));
  box-shadow: 0 0 24px rgba(249, 115, 22, 0.7);
  position: relative;
  overflow: hidden;
}

.site-header__logo-mark::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: inherit;
  background: radial-gradient(circle at 30% 20%, rgba(249, 250, 251, 0.18), transparent 60%),
              radial-gradient(circle at 70% 80%, rgba(15, 23, 42, 0.95), #020617);
}

.site-header__logo-text {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

.site-header__nav {
  display: flex;
  align-items: center;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.site-header__nav-item--cta {
  margin-left: var(--space-2);
}

.site-header__cta {
  font-size: 0.7rem;
}

/* Mobile toggle */
.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.25rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(148, 163, 184, 0.45);
  background-color: rgba(15, 23, 42, 0.9);
  cursor: pointer;
  color: var(--color-text);
}

.site-header__toggle-bar {
  width: 1.2rem;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-gray-200);
  transition: transform var(--transition-fast), opacity var(--transition-fast), translate var(--transition-fast);
}

/* Mobile / small screens */
@media (max-width: 768px) {
  .site-header__toggle {
    display: inline-flex;
    z-index: 2;
  }

  .site-header__nav {
    position: absolute;
    right: var(--space-3);
    top: calc(100% + var(--space-2));
    transform-origin: top center;
    transform: translateY(-10px) scale(0.98);
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    border-radius: var(--radius-xl);
    border: 1px solid rgba(96, 165, 250, 0.28);
    background:
      radial-gradient(circle at 16% 4%, rgba(59, 130, 246, 0.38), transparent 52%),
      radial-gradient(circle at 86% 98%, rgba(249, 115, 22, 0.34), transparent 54%),
      rgba(11, 15, 35, 0.92);
    box-shadow: var(--shadow-medium);
    transition: max-height var(--transition-normal), opacity var(--transition-normal), transform var(--transition-normal);
    z-index: 3;
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    margin: 0;
    padding: var(--space-3);
    background: transparent;
    border-bottom: 0;
    box-shadow: none;
  }

  .site-header__nav-item {
    display: flex;
    width: 100%;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
  }

  .site-header__nav-item .nav-link {
    display: flex;
    flex: 1 1 auto;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 2.875rem;
    padding: 0.7rem 0.9rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.2);
    background-color: rgba(15, 23, 42, 0.65);
    letter-spacing: 0.1em;
    color: var(--color-gray-100);
    text-align: center;
  }

  .site-header__nav-item .nav-link::after {
    left: 0.9rem;
    right: 0.9rem;
    bottom: 0.45rem;
  }

  .site-header__nav-item .nav-link:hover,
  .site-header__nav-item .nav-link:focus-visible,
  .site-header__nav-item .nav-link[aria-current="page"] {
    border-color: rgba(96, 165, 250, 0.42);
    background-color: rgba(30, 41, 59, 0.88);
  }

  .site-header__nav-item--cta {
    margin-left: 0;
    margin-top: var(--space-1);
  }

  .site-header__cta {
    display: flex;
    width: 100%;
    justify-content: center;
    min-height: 2.9rem;
    font-size: 0.76rem;
    letter-spacing: 0.08em;
    text-align: center;
  }

  .site-header--menu-open .site-header__nav {
    max-height: min(80vh, 32rem);
    opacity: 1;
    transform: translateY(0) scale(1);
  }

  .site-header--menu-open .site-header__nav-item {
    opacity: 1;
    transform: translateY(0);
  }

  .site-header--menu-open .site-header__nav-item:nth-child(1) { transition-delay: 30ms; }
  .site-header--menu-open .site-header__nav-item:nth-child(2) { transition-delay: 70ms; }
  .site-header--menu-open .site-header__nav-item:nth-child(3) { transition-delay: 110ms; }
  .site-header--menu-open .site-header__nav-item:nth-child(4) { transition-delay: 150ms; }
  .site-header--menu-open .site-header__nav-item:nth-child(5) { transition-delay: 190ms; }

  .site-header--menu-open::before {
    opacity: 1;
    pointer-events: auto;
  }

  /* Animate burger to X */
  .site-header--menu-open .site-header__toggle-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  .site-header--menu-open .site-header__toggle-bar:nth-child(2) {
    opacity: 0;
  }
  .site-header--menu-open .site-header__toggle-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

/* Medium and up */
@media (min-width: 769px) {
  .site-header__nav {
    position: static;
  }

  .site-header::before {
    display: none;
  }
}

/* Active link override (PHP can echo aria-current="page") */
.site-header__nav-list .nav-link[aria-current="page"] {
  color: var(--color-text);
}

.site-header__nav-list .nav-link[aria-current="page"]::after {
  width: 100%;
}