/*-----------------------------------*\
  # HEADER
\*-----------------------------------*/

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-30);
  padding: var(--spacing-4) 0;
  background-color: transparent;
  transition: all var(--transition-normal) var(--transition-ease);
}

.header.scrolled {
  background-color: rgba(0, 19, 51, 0.85);
  backdrop-filter: blur(10px);
  padding: var(--spacing-2) 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(1, 164, 247, 0.1);
}

.light-mode .header.scrolled {
  background-color: rgba(248, 250, 252, 0.85);
  border-bottom: 1px solid rgba(1, 164, 247, 0.1);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  position: relative;
  z-index: 1;
}

.logo::before {
  content: "";
  position: absolute;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(1, 164, 247, 0.2) 0%, transparent 70%);
  z-index: -1;
  animation: pulseLogo 3s ease-in-out infinite;
}

@keyframes pulseLogo {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.2); opacity: 0.7; }
}

.logo-icon {
  width: 2.5rem;
  height: 2.5rem;
  filter: drop-shadow(0 0 8px rgba(1, 164, 247, 0.3));
}

.logo-text {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  position: relative;
}

.logo-text .text-gradient {
  font-weight: var(--font-extrabold);
}

.navbar {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
}

.navbar-list {
  display: flex;
  gap: var(--spacing-6);
}

.navbar-link {
  position: relative;
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  padding: var(--spacing-2) 0;
  transition: color var(--transition-normal) var(--transition-ease);
}

.navbar-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-cyan-600), var(--color-purple-500));
  border-radius: var(--rounded-full);
  transition: width var(--transition-normal) var(--transition-ease);
  box-shadow: 0 0 8px rgba(1, 164, 247, 0.5);
}

.navbar-link:hover,
.navbar-link.active {
  color: var(--color-text-primary);
}

.navbar-link:hover::after,
.navbar-link.active::after {
  width: 100%;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.auth-buttons {
  display: flex;
  gap: var(--spacing-3);
}

.btn-login {
  color: var(--color-cyan-600);
  font-weight: var(--font-medium);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--rounded-md);
  border: 1px solid var(--color-cyan-600);
  transition: all var(--transition-normal) var(--transition-ease);
  position: relative;
  overflow: hidden;
  background: transparent;
  z-index: 1;
}

.btn-login::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--color-cyan-600), var(--color-teal-600));
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.btn-login:hover {
  color: white;
  box-shadow: 0 0 10px rgba(1, 164, 247, 0.3);
  transform: translateY(-2px);
}

.btn-login:hover::after {
  opacity: 1;
}

.btn-register {
  background: linear-gradient(135deg, var(--color-cyan-600), var(--color-purple-500));
  color: white;
  font-weight: var(--font-medium);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--rounded-md);
  transition: all var(--transition-normal) var(--transition-ease);
  box-shadow: 0 2px 8px rgba(1, 164, 247, 0.3);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn-register::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(transparent, transparent, transparent, rgba(255, 255, 255, 0.3));
  transform: rotate(45deg);
  z-index: -1;
  transition: all 0.5s ease;
}

.btn-register:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(1, 164, 247, 0.4), 0 0 10px rgba(157, 107, 238, 0.3);
}

.btn-register:hover::before {
  animation: btnSweep 1s forwards;
}

@keyframes btnSweep {
  0% { transform: rotate(45deg) translateX(-100%); }
  100% { transform: rotate(45deg) translateX(100%); }
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--rounded-full);
  color: var(--color-text-primary);
  font-size: 1.25rem;
  transition: all var(--transition-normal) var(--transition-ease);
  background-color: rgba(255, 255, 255, 0.05);
  position: relative;
  overflow: hidden;
}

.theme-toggle::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: linear-gradient(135deg, var(--color-bg-secondary), var(--color-teal-500));
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}

.theme-toggle:hover {
  color: white;
  transform: rotate(15deg);
}

.theme-toggle:hover::after {
  opacity: 0.2;
}

.theme-toggle i {
  filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.5));
  transition: all 0.3s ease;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
  cursor: pointer;
  z-index: 41;
  position: relative;
}

.nav-toggle span {
  display: block;
  height: 3px;
  width: 100%;
  background: linear-gradient(90deg, var(--color-cyan-600), var(--color-purple-500));
  border-radius: var(--rounded-full);
  box-shadow: 0 0 5px rgba(1, 164, 247, 0.3);
  transition: all var(--transition-normal) var(--transition-ease);
}

/* Mobile Menu Animation */
.nav-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
  background: linear-gradient(90deg, var(--color-pink-600), var(--color-purple-500));
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
  background: linear-gradient(90deg, var(--color-purple-500), var(--color-pink-600));
}