/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  background-color: var(--layer-01);
  border-bottom: 1px solid var(--border-color);
}

.header.scrolled {
  background-color: var(--layer-02);
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
  transition: height var(--transition-normal);
}

.header.scrolled .header-inner {
  height: 70px;
}
.logo {
            font-size: var(--text-2xl);
            font-weight: 700;
            color: var(--primary-600);
            display: flex;
            align-items: center;
            transition: all var(--transition-spring);
            position: relative;
            text-decoration: none;
            padding: var(--space-2) var(--space-3);
            border-radius: var(--radius-lg);
            background: linear-gradient(135deg, transparent, rgba(99, 102, 241, 0.05));
            border: 1px solid transparent;
        }
        
        .logo:hover {
            transform: translateY(-3px) scale(1.02);
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(147, 51, 234, 0.08));
            border-color: rgba(99, 102, 241, 0.2);
            box-shadow: 
            0 8px 25px rgba(99, 102, 241, 0.15),
            0 3px 8px rgba(0, 0, 0, 0.1);
        }
        
        .logo::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, 
            rgba(99, 102, 241, 0.1) 0%, 
            rgba(147, 51, 234, 0.08) 50%, 
            rgba(76, 201, 240, 0.06) 100%);
            border-radius: var(--radius-lg);
            opacity: 0;
            transition: opacity var(--transition-normal);
            z-index: -1;
        }
        
        .logo:hover::before {
            opacity: 1;
        }
        
        .logo img {
            height: 40px;
            margin-right: var(--space-3);
            transition: all var(--transition-spring);
            filter: brightness(1) saturate(1);
            border-radius: var(--radius);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }
        
        .logo:hover img {
            height: 42px;
            filter: brightness(1.1) saturate(1.1);
            transform: rotate(-2deg);
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
        }
        
        .logo span {
            background: linear-gradient(135deg, 
            var(--primary-600) 0%, 
            var(--secondary-600) 100%);
            background-size: 200% 200%;
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            animation: logoGradientShift 3s ease-in-out infinite;
            font-weight: 800;
            letter-spacing: -0.02em;
        }
        
        @keyframes logoGradientShift {
            0%, 100% {
            background-position: 0% 50%;
            }
            50% {
            background-position: 100% 50%;
            }
        }
        
        .dark .logo {
            background: linear-gradient(135deg, transparent, rgba(99, 102, 241, 0.1));
        }
        
        .dark .logo:hover {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(147, 51, 234, 0.12));
        }
        
        @media (max-width: 768px) {
            .logo {
            padding: var(--space-1) var(--space-2);
            font-size: var(--text-lg);
            }
            
            .logo img {
            height: 32px;
            margin-right: var(--space-2);
            }
            
            .logo:hover img {
            height: 34px;
            }
        }
        
.header.scrolled .logo img {
  height: 36px;
}

/* Navigation */
.nav-desktop {
  display: none;
}

@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
    align-items: center;
  }
  
  .nav-mobile,
  .header .mobile-menu-btn {
    display: none;
  }
}

.nav-desktop ul {
  display: flex;
  gap: var(--space-8);
}

.nav-link {
  color: var(--text-primary);
  font-weight: 500;
  position: relative;
  padding: var(--space-2) 0;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-600);
  transition: width var(--transition-normal);
}

.nav-link:hover {
  color: var(--primary-600);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Language Switcher */
.language-switcher {
  position: relative;
}

.language-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: none;
  border: none;
  color: var(--text-primary);
  font-weight: 500;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius);
  transition: all var(--transition-fast);
}

.language-btn:hover {
  background-color: var(--bg-tertiary);
}

.language-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  width: 120px;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  margin-top: var(--space-2);
  transform-origin: top right;
  transform: scale(0.95);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.language-dropdown.active {
  transform: scale(1);
  opacity: 1;
  visibility: visible;
}

.language-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.language-option:hover {
  background-color: var(--bg-tertiary);
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--primary-100);
  color: var(--primary-600);
  transform: rotate(15deg);
}

/* Mobile Menu */
.mobile-menu-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: var(--text-xl);
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.mobile-menu-btn:hover {
  background-color: var(--bg-tertiary);
}

.mobile-menu-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: var(--text-2xl);
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.mobile-menu-close:hover {
  background-color: var(--bg-tertiary);
}

.nav-mobile {
  position: fixed;
  top: 0;
  right: 0;
  width: 85%;
  max-width: 320px;
  height: 100vh;
  background-color: var(--layer-03);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
  padding: var(--space-8);
  padding-top: 100px;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  z-index: 900;
  overflow-y: auto;
}

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

.nav-mobile ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

@media (max-width: 480px) {
  .nav-mobile {
    width: 90%;
    padding: var(--space-6);
    padding-top: 90px;
  }
  
  .nav-mobile .nav-link {
    font-size: var(--text-lg);
    padding: var(--space-2) 0;
  }
  
  .nav-mobile .nav-actions {
    margin-top: var(--space-6);
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 600;
  transition: all var(--transition-normal);
  cursor: pointer;
  white-space: nowrap;
  border: none;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  will-change: transform;
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn-primary {
  background-color: var(--primary-600);
  color: white;
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  background-color: var(--primary-700);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--secondary-600);
  color: white;
  box-shadow: var(--shadow);
}

.btn-secondary:hover {
  background-color: var(--secondary-700);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--primary-600);
  color: var(--primary-600);
}

.btn-outline:hover {
  background-color: var(--primary-50);
  color: var(--primary-700);
  transform: translateY(-2px);
}

.btn-text {
  background-color: transparent;
  color: var(--primary-600);
  padding: var(--space-2);
}

.btn-text:hover {
  background-color: var(--primary-50);
  color: var(--primary-700);
}