/* ===================================
   HEADER / NAVBAR STYLES
   =================================== */

.navbar {
  background: var(--bg-primary);
  box-shadow: var(--shadow-sm);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: box-shadow var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

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

/* Brand */
.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  transition: transform var(--transition-base);
}

.navbar-brand:hover {
  transform: scale(1.02);
}

.navbar-brand img {
  height: 45px;
  width: auto;
}

.brand-text {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-extrabold);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Navigation Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
  list-style: none;
}

.nav-link {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--primary);
}

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

.nav-link.active {
  color: var(--primary);
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Icon Buttons */
.btn-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  background: var(--bg-tertiary);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-icon:hover {
  background: var(--gray-300);
  transform: translateY(-2px);
}

[data-theme="dark"] .btn-icon {
  background: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .btn-icon:hover {
  background: rgba(255, 255, 255, 0.2);
}

.btn-icon svg {
  width: 20px;
  height: 20px;
  color: var(--text-primary);
}

/* Theme Toggle Icons */
.sun-icon { display: block; }
.moon-icon { display: none; }

[data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: block; }

/* Login Button */
.btn-login {
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--gradient-primary);
  color: var(--white);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  transition: all var(--transition-base);
}

.btn-login:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
  color: var(--white);
}

.btn-login svg {
  width: 16px;
  height: 16px;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  background: var(--bg-tertiary);
  border: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
  color: var(--text-primary);
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-lg) 0;
}

.mobile-nav.active {
  display: block;
}

.mobile-nav-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-nav-links li {
  margin-bottom: var(--space-sm);
}

.mobile-nav-links .nav-link {
  display: block;
  padding: var(--space-sm) 0;
  font-size: var(--font-size-lg);
}

/* Responsive */
@media (max-width: 991px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .btn-login {
    font-size: var(--font-size-xs);
    padding: var(--space-xs) var(--space-md);
  }
}

@media (max-width: 576px) {
  .brand-text {
    display: none;
  }

  .navbar-brand img {
    height: 35px;
  }

  .nav-actions {
    gap: var(--space-xs);
  }
}