/* Header styles for Polviion */
.pv-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: radial-gradient(circle at top left, rgba(0, 224, 255, 0.18), transparent 55%),
              radial-gradient(circle at top right, rgba(168, 85, 247, 0.18), transparent 55%),
              rgba(5, 8, 22, 0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.3);
}

.pv-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.pv-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.pv-brand-mark {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 0.9rem;
  background: conic-gradient(from 210deg, #22d3ee, #a855f7, #f97316, #22d3ee);
  box-shadow: 0 0 18px rgba(56, 189, 248, 0.75);
  position: relative;
  overflow: hidden;
}

.pv-brand-mark::after {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: inherit;
  background: radial-gradient(circle at 30% 0, rgba(248, 250, 252, 0.2), transparent 55%),
              #020617;
}

.pv-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.pv-brand-title {
  font-family: "Orbitron", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.95rem;
  color: #e5e7eb;
}

.pv-brand-subtitle {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: #38bdf8;
}

/* Nav */
.pv-nav {
  display: flex;
  align-items: center;
}

.pv-nav-list {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.pv-nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  text-decoration: none;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #e5e7eb;
  border: 1px solid transparent;
}

.pv-nav-link::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.2), transparent 60%);
  opacity: 0;
  transition: opacity 0.2s ease-out, transform 0.2s ease-out;
  transform: scale(0.9);
  z-index: -1;
}

.pv-nav-link:hover,
.pv-nav-link:focus-visible {
  color: #f9fafb;
  border-color: rgba(56, 189, 248, 0.8);
  outline: none;
}

.pv-nav-link:hover::after,
.pv-nav-link:focus-visible::after {
  opacity: 1;
  transform: scale(1);
}

.pv-nav-link:focus-visible {
  box-shadow: 0 0 0 2px #0f172a, 0 0 0 4px #38bdf8;
}

/* Mobile toggle */
.pv-nav-toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: radial-gradient(circle at 30% 0, rgba(56, 189, 248, 0.28), transparent 55%),
              rgba(15, 23, 42, 0.96);
  color: #e5e7eb;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.pv-nav-toggle:hover,
.pv-nav-toggle:focus-visible {
  border-color: #38bdf8;
  box-shadow: 0 0 0 2px rgba(8, 47, 73, 0.8), 0 0 0 4px rgba(56, 189, 248, 0.8);
  outline: none;
}

.pv-nav-toggle-bar {
  width: 1.4rem;
  height: 2px;
  border-radius: 999px;
  background-color: #e5e7eb;
  transition: transform 0.2s ease, opacity 0.2s ease, background-color 0.2s ease;
}

.pv-nav-toggle-bar + .pv-nav-toggle-bar {
  margin-top: 0.22rem;
}

/* Active (open) state */
.pv-header.is-nav-open .pv-nav-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.pv-header.is-nav-open .pv-nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.pv-header.is-nav-open .pv-nav-toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Responsive behavior */
@media (max-width: 768px) {
  .pv-nav-toggle {
    display: inline-flex;
    flex-direction: column;
  }

  .pv-nav {
    position: fixed;
    inset-inline: 0;
    top: 3.4rem;
    background: radial-gradient(circle at top, rgba(15, 23, 42, 0.98), rgba(2, 6, 23, 0.98));
    border-bottom: 1px solid rgba(30, 64, 175, 0.6);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.2s ease-out, opacity 0.2s ease-out, visibility 0.2s ease-out;
  }

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

  .pv-nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 0.7rem 1.1rem 1.1rem;
    gap: 0.25rem;
  }

  .pv-nav-link {
    width: 100%;
    justify-content: space-between;
    padding: 0.65rem 0.85rem;
    border-radius: 0.7rem;
    background: rgba(15, 23, 42, 0.85);
    border-color: rgba(30, 64, 175, 0.7);
  }

  .pv-nav-link::after {
    background: linear-gradient(90deg, rgba(56, 189, 248, 0.2), transparent 60%);
  }

  .pv-brand-title {
    font-size: 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .pv-nav,
  .pv-nav-toggle-bar,
  .pv-nav-link::after {
    transition: none !important;
  }
}