/* ==================== VARIABLES HEADER ==================== */
:root {
  --header-border: rgba(114, 214, 255, 0.2);
  --header-accent: #72d6ff;
  --header-accent-purple: #ff7fff;
  --header-height: 70px;
  --header-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --header-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

/* ==================== HEADER PRINCIPAL ==================== */
.site-header {
  position: relative;
  z-index: 2;
  overflow: hidden;
  text-align: center;
}

/* Canvas de estrellas — inyectado por header-stars.js */
.site-header .star-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* Nebulosas de color sobre el canvas */
.site-header .nebula {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 1;
}
.site-header .nebula-1 {
  width: 350px; height: 140px;
  top: -50px; left: 10%;
  background: radial-gradient(ellipse, rgba(114,214,255,0.28) 0%, transparent 70%);
  filter: blur(35px);
  animation: nebulaFloat 10s ease-in-out infinite alternate;
}
.site-header .nebula-2 {
  width: 280px; height: 120px;
  top: -40px; right: 15%;
  background: radial-gradient(ellipse, rgba(255,127,255,0.22) 0%, transparent 70%);
  filter: blur(30px);
  animation: nebulaFloat 13s ease-in-out infinite alternate-reverse;
}
.site-header .nebula-3 {
  width: 200px; height: 90px;
  top: 5px; left: 46%;
  background: radial-gradient(ellipse, rgba(56,189,248,0.18) 0%, transparent 70%);
  filter: blur(25px);
  animation: nebulaFloat 16s ease-in-out infinite alternate;
}

@keyframes nebulaFloat {
  from { transform: translateX(-12px); }
  to   { transform: translateX(12px); }
}

/* Overlay de profundidad sobre todo */
.site-header .header-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg,
    rgba(5,8,30,0.88) 0%,
    rgba(5,8,30,0.45) 30%,
    rgba(5,8,30,0.45) 70%,
    rgba(5,8,30,0.88) 100%
  );
  pointer-events: none;
  z-index: 2;
}

/* Línea brillante superior */
.site-header::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg,
    transparent,
    var(--header-accent) 20%,
    var(--header-accent-purple) 50%,
    var(--header-accent) 80%,
    transparent
  );
  box-shadow: 0 0 18px rgba(114, 214, 255, 0.5);
  animation: headerGlow 6s ease-in-out infinite;
  z-index: 10;
}

@keyframes headerGlow {
  0%, 100% { opacity: 0.55; }
  50%       { opacity: 1; }
}

/* ==================== ESTRUCTURA HEADER ==================== */
.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
  position: relative;
  z-index: 5; /* por encima del canvas y nebulosas */
}

/* ==================== LOGO ==================== */
.site-header .logo-container {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  position: relative;
  z-index: 5;
}

.site-header .logo {
  height: 30px;
  cursor: pointer;
  filter: drop-shadow(0 0 10px rgba(114, 214, 255, 0.55));
  touch-action: manipulation;
  transition: filter var(--header-transition);
}

.site-header .logo:active {
  transform: scale(0.95);
}

/* ==================== BOTÓN HAMBURGUESA ==================== */
.menu-toggle {
  display: none;
  flex-direction: column;
  background: rgba(20, 20, 40, 0.8);
  border: 1px solid rgba(114, 214, 255, 0.3);
  border-radius: 8px;
  padding: 0.75rem;
  cursor: pointer;
  gap: 4px;
  z-index: 92;
  transition: var(--header-transition);
  touch-action: manipulation;
  position: relative;
}

.hamburger-line {
  width: 22px;
  height: 2px;
  background: var(--header-accent);
  transition: all 0.3s ease;
  transform-origin: center;
  border-radius: 2px;
}

.menu-toggle:active {
  transform: scale(0.95);
  background: rgba(114, 214, 255, 0.15);
}

/* ==================== NAVEGACIÓN DESKTOP ==================== */
.site-header nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  position: relative;
  z-index: 5;
  flex: 1;
  justify-content: center;
  margin: 0 1rem;
}

.site-header nav a {
  padding: 10px 14px;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 8px;
  transition: var(--header-transition);
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--header-accent);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

.site-header nav a svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.5;
  transition: transform var(--header-transition);
}

/* Shimmer al hover */
.site-header nav a::before {
  content: '';
  position: absolute;
  width: 100%; height: 100%;
  transition: left 0.5s ease;
}

.site-header nav a:active {
  transform: scale(0.95);
  background: rgba(114, 214, 255, 0.2);
  color: var(--header-accent-purple);
}

.site-header nav a.nav-highlight {
  background: linear-gradient(135deg, rgba(114,214,255,0.2), rgba(255,127,255,0.2));
  border-color: var(--header-accent);
  font-weight: 700;
}

/* ==================== OVERLAY MÓVIL ==================== */
.nav-overlay {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 89;
}

/* ==================== NAVEGACIÓN MÓVIL ==================== */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  background: rgba(5, 8, 30, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  padding: 2rem 1.5rem;
  margin: 0;
  gap: 0.75rem;
  z-index: 91;
  overflow-y: auto;
  border-top: 1px solid rgba(114, 214, 255, 0.2);
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-nav.active {
  display: flex;
  transform: translateX(0);
}

.mobile-nav a {
  width: 100%;
  padding: 1.2rem 1.5rem;
  font-size: 1.05rem;
  border-radius: 12px;
  border: 1px solid rgba(114, 214, 255, 0.3);
  background: rgba(20, 20, 40, 0.8);
  text-align: left;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--header-accent);
  text-decoration: none;
  transition: var(--header-transition);
  min-height: 60px;
  position: relative;
  overflow: hidden;
}

.mobile-nav a svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.mobile-nav a::before {
  content: '';
  position: absolute;
  left: 0; top: 0;
  width: 4px; height: 100%;
  background: linear-gradient(180deg, var(--header-accent), var(--header-accent-purple));
  transform: scaleY(0);
  transition: transform var(--header-transition);
}

.mobile-nav a:active {
  background: rgba(114, 214, 255, 0.3);
  transform: scale(0.98);
}

.mobile-nav a:active::before {
  transform: scaleY(1);
}

/* ==================== BOTÓN GEAR ==================== */
.site-header .customize-gear {
  position: relative;
  background: transparent !important;
  border: 2px solid rgba(114, 214, 255, 0.4) !important;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(114, 214, 255, 0.2) !important;
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--header-transition);
  color: var(--header-accent);
  z-index: 5;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
  margin-left: auto;
}

.site-header .customize-gear svg {
  width: 22px; height: 22px;
  transition: transform var(--header-transition);
  stroke: currentColor;
}

.gear-pulse {
  position: absolute;
  top: 50%; left: 50%;
  width: 100%; height: 100%;
  border-radius: 50%;
  background: rgba(114, 214, 255, 0.3);
  transform: translate(-50%, -50%) scale(1);
  opacity: 0;
  pointer-events: none;
}

.site-header .customize-gear:active .gear-pulse {
  animation: gearPulse 0.6s ease-out;
}

@keyframes gearPulse {
  0%   { transform: translate(-50%,-50%) scale(1); opacity: 1; }
  100% { transform: translate(-50%,-50%) scale(1.8); opacity: 0; }
}

.site-header .customize-gear:active {
  transform: scale(0.92);
  background: rgba(114, 214, 255, 0.15) !important;
  border-color: var(--header-accent) !important;
  color: var(--header-accent-purple);
}

/* ==================== HOVER (solo desktop) ==================== */
@media (hover: hover) {
  .site-header .logo:hover {
    filter: drop-shadow(0 0 18px var(--header-accent));
  }

  .site-header nav a:hover::before {
    left: 100%;
  }

  .site-header nav a:hover,
  .site-header nav a:focus {
    color: var(--header-accent-purple);
  }

  .site-header nav a:hover svg {
    transform: translateY(-2px);
  }


}