/* Header Navy Background with Scroll Effect */
.alpha-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #1e293b;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.alpha-header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid #E5E7EB;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: white;
    transition: color 0.3s;
}

.alpha-header.scrolled .logo-text {
    color: #8B5CF6;
}

.nav-link {
    padding: 8px 16px;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.3s;
}

.alpha-header.scrolled .nav-link {
    color: #374151;
}

.nav-link:hover {
    color: #8B5CF6;
    background: rgba(139, 92, 246, 0.1);
    transform: translateY(-2px);
}

.header-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    color: rgba(255, 255, 255, 0.9);
}

.alpha-header.scrolled .header-btn {
    color: #374151;
}

.login-btn {
    color: rgba(255, 255, 255, 0.9);
}

.alpha-header.scrolled .login-btn {
    color: #6B7280;
}

.login-btn:hover {
    color: #8B5CF6;
    background: rgba(139, 92, 246, 0.1);
}

.register-btn {
    color: white;
    background: linear-gradient(135deg, #8B5CF6, #6D28D9);
}

.register-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(139, 92, 246, 0.3);
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: white;
    transition: background 0.3s;
}

.alpha-header.scrolled .mobile-toggle span {
    background: #374151;
}